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DESCRIPTION JP2003111194
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker provided with a plurality of diaphragms and a portable terminal device equipped with
the same.
[0002]
2. Description of the Related Art A speaker having one magnetic circuit and two diaphragms is
disclosed in JP-A-62-277000, JP-A-4-135096 and JP-A-11-252683. A speaker disclosed in
Japanese Patent Application Laid-Open No. 11-252683 will be described.
[0003]
FIG. 22 shows a cross-sectional view of a speaker 3000 disclosed in Japanese Patent Laid-Open
No. 11-252683. The speaker 3000 has a pole piece 1 having a recess in which a hole 14 is
formed in the central portion, a yoke 2 functioning as a frame in which a central portion is
concave and a hole 13 is formed, and fixation between the pole piece 1 and the yoke 2 And the
ring-shaped magnet 3. In the speaker 3000, first and second magnetic air gaps 4 and 5 are
formed on the outer peripheral side and the inner peripheral side of the magnet 3 by the pole
piece 1 and the yoke 2, respectively. In the speaker 3000, the first voice coil 6 inserted in the
first magnetic gap 4, the second voice coil 7 inserted in the second magnetic gap 5, and the outer
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peripheral portion thereof are supported by the yoke 2, A first diaphragm 8 to which a first voice
coil 6 is connected, and a second diaphragm 9 whose outer peripheral portion is supported by
the yoke 2 and a second voice coil 7 is connected to a central portion; The first and second
protectors 10 and 11 provided in the front direction of the first and second diaphragms 8 and 9
are further provided. The speaker 3000 is mounted on the printed circuit board 12 of the device.
The printed circuit board 12 is formed with a hole 15 to be fitted with the hole 13.
[0004]
The operation of the speaker 3000 will be described. When an electric signal is input to the first
voice coil 6, the first diaphragm vibrates to generate a sound. The sound is radiated through the
holes 13 of the yoke 2 and the holes 15 of the printed circuit board 12 which are formed so as
not to interfere with the movement of the sound waves. In addition, when an electric signal is
input to the second voice coil 7, the second diaphragm 9 vibrates to generate a sound. This
sound is radiated through the hole 14 of the pole piece 1, the hole 13 of the yoke 2, and the hole
15 of the printed circuit board 12 formed so as not to interfere with the movement of the sound
wave. When the speaker 3000 is mounted on a mobile phone, the second diaphragm 9 is used as
a receiver, and the first diaphragm 8 having an outer diameter larger than that of the second
diaphragm 9 is functioned as a sounder for ringing tone reproduction. .
[0005]
Although such a speaker 3000 is not described in JP-A-11-252683, the sound from the first and
second diaphragms 8 and 9 is usually , Emitted directly from the holes formed in the protectors
10 and 11.
[0006]
However, to explain the most popular portable telephone as a portable terminal device, the liquid
crystal display unit disposed on the front of the casing of the portable telephone has recently
displayed a large number of characters and image information, so that the screen The
dimensions are getting bigger and bigger.
As a result, the mounting position of the speaker for reproducing the receiving sound arranged
adjacent to the display unit on the front of the case disappears, and the diameter of the speaker
is about 10 mm, although the size was about 20 mm until several years ago. It is getting smaller
02-05-2019
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and smaller. However, mere size reduction causes the diaphragm and the magnetic circuit to be
smaller, so that sufficient sound pressure levels can not be obtained, and further problems such
as lack of bass occur. A speaker with a relatively large aperture of 20 mm in outer dimensions
can obtain sufficient acoustic characteristics, but since it is configured to emit sound from the
hole of the protector, a large space is required on the side of the display unit, and a large screen
display It has been difficult to realize a mobile phone equipped with a unit. In addition, the
radiation position of the sound is a limited position of the mobile phone such as the upper part of
the display unit.
[0007]
Further, in the speaker 3000, the edge portion of the second diaphragm 9 which determines the
lowest resonance frequency (ie, the connection portion between the second diaphragm 9 and the
second voice coil 7) and the second diaphragm 9 In the portion between the and the connection
portion with the yoke 2), the stiffness of the edge portion is increased unless it is increased, and
sufficient low-pass reproduction becomes difficult. For this purpose, it is necessary to reduce the
outer diameter of the magnet 3 and reduce the diameter of the second magnetic gap 5 or to
increase the outer diameter of the second diaphragm 9. The same applies to the first diaphragm
8. However, when the external shape of the magnet 3 is reduced, there is a problem that the
driving efficiency of the speaker 3000 is lowered due to lack of magnetic energy. In addition,
when the outer shape of the second diaphragm 9 is increased, the diameter of the speaker 3000
is increased, and there is a problem that space saving can not be realized.
[0008]
In the speaker 3000, the back of the first diaphragm 8 and the back of the second diaphragm 9
are acoustically coupled by the holes 14 of the pole piece 1. Therefore, when an electric signal is
applied to the first voice coil 6 and the sound is reproduced from the first diaphragm 8, the
sound generated on the back surface of the first diaphragm 8 is transmitted through the hole 14
and the second The air pressure of the back surface of the diaphragm 9 is changed to vibrate the
diaphragm 9. Therefore, there is a problem that sound is generated from the second diaphragm 9
even when the electric signal is not applied to the second voice coil 7. Similarly, even when an
electric signal is applied to the second voice coil 7 to reproduce sound from the second
diaphragm 9, the first diaphragm 8 is driven by the second diaphragm 9 to generate sound.
There was a problem that Therefore, the speaker 3000 can not drive the first diaphragm 8 and
the second diaphragm 9 independently.
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[0009]
The present invention is to solve the above problems, and it is an object of the present invention
to provide a speaker having high driving efficiency and capable of generating a large sound even
with a small size, and having excellent driving characteristics and acoustic characteristics. Do.
Still another object of the present invention is to provide a speaker with a high degree of freedom
in the placement location inside the portable terminal device.
[0010]
A speaker according to the present invention comprises a first magnet, a second magnet
provided so as to surround the first magnet, a first magnet, and a second magnet. The first voice
coil, the second voice coil, the first diaphragm connected to the first voice coil, and the first
diaphragm with respect to the first magnet A second diaphragm provided on the opposite side
and connected to the second voice coil, a first magnetic plate provided between the first
diaphragm and the first magnet, and a second vibration A second magnetic plate provided
between the plate and the second magnet, wherein the first voice coil is provided in a first
magnetic gap between the first magnetic plate and the yoke; The second voice coil is provided in
a second magnetic gap between the second magnetic plate and the yoke. Is, the objects can be
achieved.
[0011]
The apparatus may further comprise a frame for supporting the outer periphery of the first
diaphragm and the outer periphery of the second diaphragm.
[0012]
It may further comprise a first acoustic tube for transmitting the sound generated from the first
diaphragm.
[0013]
The first acoustic tube may be provided at an off-center position of the first diaphragm.
[0014]
A cover for covering a first diaphragm provided on the opposite side to the first magnet with
respect to the first diaphragm, the first acoustic tube comprising the first diaphragm and the
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cover It may have a shape protruding from the space between
[0015]
The first acoustic tube may have a shape protruding from the space between the first diaphragm
and the second magnet.
[0016]
The cross-sectional area of the first acoustic tube may be constant.
[0017]
The first acoustic tube may be horn shaped.
[0018]
The cross-sectional area of a portion of the first acoustic tube may be larger than the other crosssectional area of the first acoustic tube.
[0019]
It may further comprise a second acoustic tube for transmitting the sound generated from the
second diaphragm.
[0020]
A yoke is provided between the first magnet and the second magnet, between the first diaphragm
and the second magnet, and between the second diaphragm and the first magnet. It is also good.
[0021]
A speaker according to the present invention comprises a yoke, a magnet provided so as to
surround the yoke, a first voice coil, a second voice coil, and a first vibration connected to the
first voice coil. A plate and a second diaphragm provided on the opposite side of the first
diaphragm to the yoke and connected to the second voice coil, and provided between the first
diaphragm and the magnet A first annular magnetic plate, a second annular magnetic plate
provided between the second diaphragm and the magnet, and a nonmagnetic connecting
member for connecting the yoke and the magnet; The voice coil is provided in a first magnetic
gap between the yoke and the first annular magnetic plate, and the second voice coil is provided
in a second magnetic gap between the yoke and the second annular magnetic plate The above
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object is achieved by this.
[0022]
The inner diameter of the first annular magnetic plate may be different from the inner diameter
of the second annular magnetic plate.
[0023]
The inner diameter of the first annular magnetic plate may be the same as the inner diameter of
the second annular magnetic plate.
[0024]
The portable terminal device of the present invention is a portable terminal device comprising a
housing and a speaker provided in the housing, wherein the speaker is provided so as to
surround the first magnet and the first magnet. A second voice coil connected to the first voice
coil, a yoke connecting the first magnet and the second magnet, a first voice coil, a second voice
coil, and a first voice coil A diaphragm, a second diaphragm provided on the opposite side to the
first diaphragm with respect to the first magnet and connected to a second voice coil, a first
diaphragm, and a first magnet And a second magnetic plate provided between the second
diaphragm and the second magnet, and the first voice coil comprises Provided in the first
magnetic gap between the magnetic plate and the yoke of the second The coil is provided in the
second magnetic gap between the second magnetic plate and the yoke, and the housing is
provided with a first sound hole so that the sound generated from the first diaphragm is emitted.
And the second sound hole is formed such that the sound generated from the second diaphragm
is emitted, thereby achieving the above object.
[0025]
It may further comprise at least one of a first acoustic tube connected to the first sound hole and
a second acoustic tube connected to the second sound hole.
[0026]
Whether an antenna for receiving a wireless signal, a signal output unit for outputting an
electrical signal based on the received wireless signal, and an electrical signal to the first voice
coil or the second voice coil are output And a selection unit for selecting
[0027]
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The electrical signal may indicate at least one of a listening sound, a ringing tone, music and
voice.
[0028]
If the electrical signal indicates a received sound, the electrical signal is output to the first voice
coil, the speaker acts as a receiver, and the electrical signal indicates at least one of ringtone,
music and voice. The electrical signal may be output to a second voice coil and the speaker may
operate as a loudspeaker.
[0029]
The resonant frequency of the first diaphragm may be lower than the resonant frequency of the
second diaphragm.
[0030]
The display device may further include a display unit adjacent to the first sound hole.
[0031]
The electronic device may further comprise an antenna for receiving a wireless signal, and a
signal output unit for outputting an electrical signal to the first voice coil and the second voice
coil based on the received wireless signal.
[0032]
The electrical signal includes the audio signal of the first channel and the audio signal of the
second channel, the audio signal of the first channel being output to the first voice coil and the
audio signal of the second channel May be output to the second voice coil.
[0033]
The display device may further comprise a first sound tube and a second sound tube having a
horn shape, and the first sound hole and the second sound hole may be formed in the same plane
as the display portion. .
[0034]
The cross-sectional area of a portion of the first acoustic tube is larger than the other crosssectional area of the first acoustic tube, and the cross-sectional area of a portion of the second
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acoustic tube is the other cross-sectional area of the second acoustic tube It may be larger.
[0035]
The first acoustic tube and the second acoustic tube may be integrally formed with the housing.
[0036]
The first diaphragm and the second diaphragm may be formed of materials different from each
other.
[0037]
An antenna that receives a wireless signal, a signal output unit that outputs an electrical signal
based on the received wireless signal, and an electrical signal that has been adjusted to adjust the
sound image of the sound output from the speaker. The image processing apparatus may further
include a sound image adjustment unit that outputs a signal to the first voice coil and the second
voice coil.
[0038]
The electrical signal may comprise audio signals of multiple channels.
[0039]
The pole direction of the first magnet and the pole direction of the second magnet may be
opposite.
[0040]
The area of the first diaphragm may be different from the area of the second diaphragm.
[0041]
The area of the first diaphragm may be smaller than the area of the second diaphragm.
[0042]
The acoustic system further comprises an acoustic tube connected to the first sound hole, the
first sound hole and the second sound hole being formed in different faces of the housing, and
the speaker comprises a second diaphragm and a second It may be provided so as to face the
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sound hole of.
[0043]
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0044]
Embodiment 1 A loudspeaker 1000 according to Embodiment 1 of the present invention will be
described with reference to FIGS. 1A and 1B.
FIG. 1A is a plan view of the speaker 1000, and FIG. 1B is a cross-sectional view of the speaker
1000 along dotted lines ab shown in FIG. 1A.
[0045]
The speaker 1000 comprises a cylindrical first magnet 20, an annular second magnet 21
provided so as to surround the first magnet 20, a first magnet 20, and a second magnet 21.
Between a first voice coil 27 provided in a first magnetic gap 25 between the first magnet 20 and
the yoke 22, and a second magnet 21 and the yoke 22. And the first diaphragm 29 connected to
the first voice coil 27 and the first diaphragm 29 of the first magnet 20. Is provided on the
opposite side, and is provided with a second diaphragm 30 connected to the second voice coil
28, and a disc-shaped first diaphragm provided between the first diaphragm 29 and the first
magnet 20. Magnetic plate 23 and the second diaphragm A frame supporting an outer peripheral
portion of an annular second magnetic plate 24 provided between 0 and a second magnet 21, a
first diaphragm 29, a second diaphragm 30 and a second magnet 21. And a cover 32 covering
the first diaphragm 29 provided on the opposite side to the first magnet 20 of the first
diaphragm 29.
[0046]
In the speaker 1000, the first magnetic gap 25 exists between the first magnet 20 and the first
magnetic plate 23 and the yoke 22, and the second magnetic gap 26 is the second magnet 21
and the second magnetic gap 26. 2 and between the magnetic plate 24 and the yoke 22.
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The first voice coil 27 is inserted into the first magnetic air gap 25, and the second voice coil 28
is inserted into the second magnetic air gap 26.
The yoke 22 is between the first magnet 20 and the second magnet 21, between the first
diaphragm 29 and the second magnet 21, and between the second diaphragm 30 and the first
magnet 20. The central part is concave.
A magnetic circuit is formed of the first magnet 20, the second magnet 21, the first magnetic
plate 23, the second magnetic plate 24, and the yoke 22.
A vacant space 33 exists between the cover 32 and the first diaphragm 29.
The frame 31 has a plurality of sound holes 37 communicating the space between the first
diaphragm 29 and the second magnet 21 with the outside, and between the second diaphragm
30 and the second magnet 21. A plurality of sound holes 38 which communicate the space of
and the outside are formed.
The plurality of sound holes 37 and 38 are formed of the first and second diaphragms 29 and 30
by the stiffness of air existing in the space between the first and second diaphragms 29 and 30
and the second magnet 21. It is formed to prevent the rise of the lowest resonance frequency.
The speaker 1000 can be made thin by opposing the first diaphragm 29 and the second
diaphragm 30 and forming the first magnetic gap 25 and the second magnetic gap 26 between
them so as to face each other. it can.
[0047]
Speaker 1000 further includes an acoustic tube 34 having a throat 35 and an opening 36.
The throat portion 35 is provided at a position out of the center of the first diaphragm 29 of the
cover 32.
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The acoustic tube 34 is shaped to project from the cavity 33.
The cross-sectional shape of the acoustic tube 34 is rectangular, the cross-sectional area of the
acoustic tube 34 is narrower than the area of the first diaphragm 29, and the acoustic tube 34
has a straight shape whose cross-sectional area is constant in the longitudinal direction.
[0048]
Next, the operation of the speaker 1000 will be described.
[0049]
When an electric signal is applied to the second voice coil 28 inserted in the second magnetic air
gap 26, a driving force is generated in the second voice coil 28 and connected to the second
voice coil 28. The second diaphragm 30 vibrates to generate a sound.
Similarly, when an electric signal is applied to the first voice coil 27 inserted in the first magnetic
air gap 25, a driving force is generated in the first voice coil 27 and connected to the first voice
coil 27. The first diaphragm 29 vibrates to generate a sound.
[0050]
In the speaker 1000, the magnetic flux is mainly supplied to the first magnetic gap 25 from the
first magnet 20, and the magnetic flux is mainly supplied to the second magnetic gap 26 from
the second magnet 21.
Therefore, the first voice coil 27 inserted in the first magnetic gap 25 is driven using the first
magnet 20, and the second voice coil 28 inserted in the second magnetic gap 26 is the second.
The magnet 21 is driven.
In order to drive the first and second voice coils 27 and 28 using the separate magnets of the
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first magnet 20 and the second magnet 21, respectively, the single magnet 3 is used as in the
conventional speaker 3000. The driving force generated in the first and second voice coils 27
and 28 can be increased as compared with the case where two voice coils of the first and second
voice coils 6 and 7 are driven.
Thus, the speaker 1000 can generate a loud sound as compared to the conventional speaker
3000.
[0051]
Further, since the upper surface direction of the first diaphragm 29 is closed by the cover 32, the
sound generated from the first diaphragm 29 is provided to the cover 32 through the cavity
portion 33. The sound is emitted from the throat 35 of the acoustic tube 34 through the opening
36 to the external space.
As described above, in the speaker 1000, the sound generated from the second diaphragm 30 is
radiated directly toward the lower surface, and the sound generated from the first diaphragm 29
is transmitted in the acoustic tube 34 and radiated from the opening 36. Do.
In the speaker 1000, sound can be emitted from any position where the opening 36 is located.
For this reason, even when the speaker 1000 can not be installed at a position where it is desired
to emit a sound due to the space, the speaker 1000 is installed at another position and the
opening 36 is provided at a position where it is desired to emit a sound. The sound can be
emitted to the position where the sound is desired to be emitted.
In addition, the sound generated from the first diaphragm 29 and the sound generated from the
second diaphragm 30 can be radiated from different separated positions.
[0052]
Further, by completely separating the space between the first diaphragm 29 and the second
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diaphragm 30 by using the yoke 22, the lower surface of the first diaphragm 29 and the second
diaphragm are separated. It can be acoustically shielded from the upper surface of 30.
Therefore, unlike the conventional speaker 3000, the sound generated from the lower surface of
the first diaphragm 8 does not directly vibrate the second diaphragm 9 to generate a sound.
Therefore, the first diaphragm 29 and the second diaphragm 30 can function independently
based on the applied electrical signal.
[0053]
The magnetic flux density of the first magnetic air gap 25 and the second magnetic air gap 26
can be set individually by individually setting the shapes, materials, etc. of the first magnet 20
and the second magnet 21. It can.
Therefore, the acoustic characteristics of the sound radiated from each of the first diaphragm 29
and the second diaphragm 30 can be individually designed according to the purpose.
[0054]
The cover 32 and the acoustic tube 34 may be omitted from the speaker 1000.
[0055]
Second Embodiment A loudspeaker 1100 according to a second embodiment of the present
invention will be described with reference to FIGS. 2A and 2B.
FIG. 2A is a plan view of the speaker 1100, and FIG. 2B is a cross-sectional view of the speaker
1100 along dotted line c-d shown in FIG. 2A.
[0056]
The speaker 1100 includes a yoke 43, an annular magnet 40 provided so as to surround the
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yoke 43, and a first voice coil 48 provided in a first magnetic gap 46 between the yoke 43 and
the magnet 40. , A second voice coil 49 provided in a second magnetic air gap 47 between the
yoke 43 and the magnet 40, a first diaphragm 50 connected to the first voice coil 48, and a third
of the yoke 43 A second diaphragm 51 provided on the opposite side of the first diaphragm 50
and connected to the second voice coil 49, and an annular second diaphragm 51 provided
between the first diaphragm 50 and the magnet 40. 1, the nonmagnetic connection connecting
the yoke 43 and the first magnetic plate 41, and the annular second magnetic plate 42 provided
between the second diaphragm 51 and the magnet 40. Member 45, the first vibration And a
frame 52 for supporting the outer peripheral portion 50 and the second diaphragm 51 and the
magnet 40.
[0057]
In the speaker 1100, the inner diameter of the second magnetic plate 42 is larger than the inner
diameter of the first magnetic plate 41.
The yoke 43 has a flat portion facing the inner circumferential portion of the second magnetic
plate 42, a cylindrical portion facing the inner circumferential surface of the first magnetic plate
41, and a disc located on the upper inner circumferential portion of the cylindrical portion It has
a convex shape integrally formed with the portion.
A plurality of sound holes 56 are formed in the frame 52.
The first magnetic gap 46 exists between the inner circumferential surface of the magnet 40 and
the first magnetic plate 41 and the outer circumferential surface of the cylindrical portion of the
yoke 43, and the second magnetic gap 47 is the magnet 40 and the second magnetic gap 47.
Between the inner peripheral surface of the magnetic plate 42 and the outer peripheral surface
of the flat portion of the yoke 43.
A first voice coil 48 is inserted into the first magnetic air gap 46 and a second voice coil 49 is
inserted into the second magnetic air gap 47.
A magnetic circuit is formed of the magnet 40, the first magnetic plate 41, the second magnetic
plate 42 and the yoke 43.
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In the speaker 1100, there is a vacant space 58 surrounded by the first diaphragm 50, the first
magnetic plate 41, the first voice coil 48, and the frame 52.
[0058]
The speaker 1100 further comprises an acoustic tube 53 having a throat 54 and an opening 55.
A throat 54 is provided on the side of the frame 52 so that the acoustic tube 53 protrudes from
the cavity 58.
The cross-sectional shape of the acoustic tube 53 is rectangular, and has a straight shape in
which the cross-sectional area is constant in the longitudinal direction.
[0059]
Next, the operation of the speaker 1100 will be described.
[0060]
When an electric signal is applied to the second voice coil 49 inserted in the second magnetic air
gap 47, a driving force is generated in the second voice coil 49 and connected to the second
voice coil 49. The second diaphragm 51 vibrates to generate a sound.
Similarly, when an electrical signal is applied to the first voice coil 48 inserted in the first
magnetic air gap 46, a driving force is generated in the first voice coil 48 and connected to the
first voice coil 48. The first diaphragm 50 vibrates to generate a sound.
[0061]
In the speaker 1000 of the embodiment 1 shown in FIGS. 1A and 1B, two magnets of the first
and second magnets 20 and 21 are used. However, in the speaker 1100 of this embodiment, one
magnet is used. Since the magnetic flux is supplied to the two magnetic air gaps of the first
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magnetic air gap 46 and the second magnetic air gap 47 at 40, the magnetic circuit structure can
be simplified.
[0062]
In the conventional loudspeaker 3000, one magnet 3 supplies magnetic flux to the two magnetic
gaps of the first and second magnetic gaps 4 and 5, but the outer and inner sides of the magnet 3
are provided. Since the two voice coils of the first and second voice coils 6 and 7 are present, the
size of the magnet 3 can not be increased in the lateral direction.
Since the mountable range of the magnet 3 in the speaker 3000 is narrow, in particular when the
speaker 3000 has a small diameter, the magnet 3 becomes small and the driving efficiency is
significantly reduced.
In addition, if the size of the magnet 3 is forcedly increased in the lateral direction, the edge
width of the first diaphragm 8 becomes narrow, and problems such as an increase in the lowest
resonance frequency occur.
[0063]
However, in the speaker 1100 of the present invention, since both of the first and second voice
coils are provided inside the magnet 40, the size of the magnet 40 can be increased in the outer
peripheral direction.
Since the size of the magnet 40 can be increased, a large amount of magnetic flux can be
supplied to the first and second voice coils, and a large sound can be generated.
In addition, since the edge widths of the first diaphragm 50 and the second diaphragm 51 can be
increased, the minimum resonance frequency of the first diaphragm 50 and the second
diaphragm 51 can be lowered, which is low. Even in the sound range, reproduction with excellent
acoustic characteristics is possible.
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It is desired that sufficient magnetic energy is supplied to the first magnetic gap 46 and the
second magnetic gap 47 from the magnet 40 provided outside the first magnetic gap 46 and the
second magnetic gap 47. Acoustic characteristics can be realized.
[0064]
The sound generated from the first diaphragm 50 is transmitted through the cavity 58 to the
inside of the acoustic tube 53 and emitted from the opening 55 to the outside space.
The effect obtained by providing the acoustic tube 53 in the speaker 1100 is the same as that of
the speaker 1000 (FIGS. 1A and 1B) of the first embodiment.
[0065]
In the speaker 1000 of the first embodiment, it is necessary to cover the space in the upper
surface direction of the first diaphragm 29 with the cover 32 to form the empty space portion
33.
However, in the speaker 1100 of the present embodiment, the cover 32 is unnecessary because
the sound is emitted through the vacant space 58, and the configuration of the speaker 1100 can
be simplified.
[0066]
Since the speaker 1100 is provided in the case of a portable terminal or the like in practice, the
sound radiated from the upper surface of the first diaphragm 50 and the sound radiated through
the acoustic pipe 53 are acoustically Because they are separated into two, they do not cancel
each other.
Further, the sound hole 56 is formed to prevent an increase in the lowest resonance frequency of
the second diaphragm 51 due to the stiffness of air existing in the space between the second
diaphragm 51 and the magnet 40. Also in this case, the sound radiated from the lower surface of
02-05-2019
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the second diaphragm 51 and the sound radiated from the sound hole 56 are separated
acoustically in practice.
[0067]
The sound pipe 53 may be omitted from the speaker 1100. In addition, the acoustic tube 53 may
be provided in the speaker 1000 of the first embodiment.
[0068]
Third Embodiment A loudspeaker 1200 according to a third embodiment of the present
invention will be described with reference to FIGS. 3A, 3B and 4. FIG. 3A is a plan view of the
speaker 1200, FIG. 3B is a cross-sectional view of the speaker 1200 along dotted line e-f shown
in FIG. 3A, and FIG. 4 is a perspective view of the yoke 63.
[0069]
The speaker 1200 has a yoke 63, an annular magnet 60 provided so as to surround the yoke 63,
and a first voice coil 69 provided in a first magnetic gap 67 between the yoke 63 and the magnet
60. A second voice coil 70 provided in a second magnetic air gap 68 between the yoke 63 and
the magnet 60, a first diaphragm 71 connected to the first voice coil 69, and A second
diaphragm 72 provided on the opposite side to the first diaphragm 71 and connected to the
second voice coil 70, and an annular ring provided between the first diaphragm 71 and the
magnet 60 A first magnetic plate 61, an annular second magnetic plate 62 provided between the
second diaphragm 72 and the magnet 60, and a nonmagnetic connecting member 66 connecting
the yoke 63 and the magnet 60 , The first vibration 71 and the second diaphragm 72 and a
frame 73 for supporting the outer periphery of the magnet 60.
[0070]
In the speaker 1200, the inner diameter of the first magnetic plate 61 and the inner diameter of
the second magnetic plate 62 are the same.
The outer peripheral surface of the cylindrical yoke 63 is opposed to the inner peripheral
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surfaces of the magnet 60, the first magnetic plate 61 and the second magnetic plate 62. The
yoke 63 is formed with a plurality of slits 64 penetrating to the vicinity of the center in the
height direction as shown in FIG. The connecting member 66 is inserted into and fixed to the slit
64 of the yoke 63 and connected to the magnet 60.
[0071]
A first magnetic air gap 67 exists between the inner peripheral surface of the magnet 60 and the
first magnetic plate 61 and the outer peripheral surface of the yoke 63, and a second magnetic
air gap 68 exists between the magnet 60 and the second magnetic space. Between the inner
peripheral surface of the magnetic plate 62 and the outer peripheral surface of the yoke 63. A
first voice coil 69 is inserted into the first magnetic air gap 67 and a second voice coil 70 is
inserted into the second magnetic air gap 68. A magnetic circuit is formed of the magnet 60, the
first magnetic plate 61, the second magnetic plate 62, and the yoke 63. In the speaker 1100, the
first diaphragm 71, the first magnetic plate 61, the first voice coil 69, and the space 74
surrounded by the frame 73, the second diaphragm 72, and the second magnetic plate 62, a
second voice coil 70 and a cavity 75 surrounded by a frame 73 are present.
[0072]
Speaker 1200 further includes a first acoustic tube 76 having a throat 77 and an opening 78,
and a second acoustic tube 79 having a throat 80 and an opening 81. A throat 77 is provided on
the side of the frame 73 so that the first acoustic tube 76 protrudes from the cavity 74. A throat
80 is provided on the side of the frame 73 so that the second acoustic tube 79 protrudes from
the cavity 75. The cross-sectional shapes of the first acoustic tube 76 and the second acoustic
tube 79 are rectangular, and have a straight shape in which the cross-sectional area is constant
in the longitudinal direction. The first acoustic tube 76 and the second acoustic tube 79 are
extended in a direction substantially orthogonal to the vibration direction of the first and second
diaphragms 71 and 72.
[0073]
Next, the operation of the speaker 1200 will be described.
[0074]
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The operation in which an electric signal is applied to first and second voice coils 69 and 70 and
sound is generated from first and second diaphragms 71 and 72 is the same as that of the
speaker 1000 of the first and second embodiments. The description is omitted here as it is
similar to 1100.
The difference from the speakers 1000 and 1100 of the first and second embodiments is that the
first and second voice coils 69 and 70, and further the first and second magnetic gaps 67 and 68
have the same dimensions in the speaker 1200. Is a point where the first and second diaphragms
71 and 72 are also equal in size. Thereby, the acoustic characteristics of the sound radiated from
both of the first and second diaphragms 71 and 72 can be made substantially equal. The speaker
1200 is effective as a speaker for stereo reproduction in which the same acoustic characteristic
is required for the sound radiated from both of the first and second diaphragms 71 and 72.
[0075]
Also, the sounds generated from the first and second diaphragms 71 and 72 are emitted from the
openings 78 and 81 of the first and second acoustic tubes 76 and 79 through the vacant spaces
74 and 75, respectively. Ru. The first and second acoustic tubes 76 and 79 have portions
extending in a direction substantially orthogonal to the vibration directions of the first and
second diaphragms 71 and 72, and thus are horizontally separated from the speaker 1200 main
body. Openings 78 and 81 can be provided at the location.
[0076]
Since the speaker 1200 is provided in the case of a portable terminal or the like in practice, the
sound radiated from the upper surface of the first diaphragm 71 and the lower surface of the
second diaphragm 72, the first and the second The sound radiated through the second acoustic
tubes 76 and 79 is acoustically separated and does not cancel each other.
[0077]
The first and second acoustic tubes 76 and 79 may be omitted from the speaker 1200.
In addition, the first and second acoustic tubes 76 and 79 may be provided in the speakers 1000
02-05-2019
20
and 1100 of the first and second embodiments.
[0078]
Fourth Embodiment A loudspeaker 1300 according to a fourth embodiment of the present
invention will be described with reference to FIGS. 5A and 5B. However, FIG. 5A is a plan view of
the speaker 1300, and FIG. 5B is a cross-sectional view of the speaker 1300 along the dotted line
gh shown in FIG. 5A.
[0079]
The speaker 1300 comprises a cylindrical first magnet 20 'and an annular second magnet 21'
provided so as to surround the first magnet 20 '. The pole direction of the first magnet 20 'and
the pole direction of the second magnet 21' are opposite. Further, the cover 32 and the acoustic
tube 34 provided in the speaker 1000 (FIGS. 1A and 1B) of the first embodiment are omitted
from the speaker 1300. The other components and operations of the speaker 1300 are similar to
those of the speaker 1000.
[0080]
The speaker 1300 of this embodiment is characterized in that the first magnet 20 'and the
second magnet 21' are magnetized such that the magnetic pole directions are opposite to each
other.
[0081]
The difference in magnetic flux density in the first and second magnetic air gaps 25 and 26 due
to the difference in the magnetic pole direction will be described with reference to FIGS. 6A, 6B,
7A and 7B.
[0082]
FIG. 6A shows a magnetic circuit formed from the first magnet 20, the second magnet 21, the
first magnetic plate 23, the second magnetic plate 24 and the yoke 22 shown in FIG. 1B.
02-05-2019
21
6B shows a magnetic circuit formed from the first magnet 20 ', the second magnet 21', the first
magnetic plate 23, the second magnetic plate 24 and the yoke 22 shown in FIG. 5B.
Here, the magnetic pole directions of the first magnet 20 and the second magnet 21 are the
same. The arrows shown in FIGS. 6A and 6B indicate the flow of magnetic flux.
[0083]
FIGS. 7A and 7B show the difference in the magnetic flux density distribution in the height
direction of the first and second magnetic air gaps 25 and 26 due to the difference in the
magnetic pole direction. FIG. 7A shows the difference in magnetic flux density distribution at the
second magnetic air gap 26, and FIG. 7B shows the difference in magnetic flux density
distribution at the first magnetic air gap 25.
[0084]
Here, the first magnets 20 and 20 'are neodymium magnets, and the size thereof is 5.8 mm in
outer diameter and 1.1 mm in thickness. The second magnets 21 and 21 'are also neodymium
magnets, and have a size of 9.4 mm in inner diameter, 13.8 mm in outer diameter, and 1.1 mm in
thickness. Further, the width of the first magnetic gap 25 is 0.48 mm, and the height is 0.4 mm.
The gap width of the second magnetic gap 26 is 0.5 mm, and the height is 0.4 mm. The
thicknesses of the yoke 22, the first magnetic plate 23, and the second magnetic plate 24 are
each 0.4 mm.
[0085]
When the magnetic pole direction of the first magnet 20 and the second magnet 21 is the same,
as shown in FIG. 6A, the magnetic flux Φ1 flowing from the second magnet 21 passes from the
upper surface of the yoke 22 through the vertical portion 22 '. It flows through the second
magnetic gap 26 to the second magnetic plate 24. Further, the magnetic flux Φ 2 flowing from
the first magnet 20 flows from the first magnetic plate 23 through the first magnetic gap 25 and
flows through the vertical portion 22 ′ to the bottom of the yoke 22. That is, the directions of
the magnetic flux 11 and the magnetic flux 22 in the vertical portion 22 'of the yoke 22 become
02-05-2019
22
the same, and the magnetic flux 11 and the magnetic flux 22 are combined to increase the
magnetic flux density in the vertical portion 22'. Therefore, when magnetic saturation occurs in
the vertical portion 22 'due to the combined high density magnetic flux, the flow of the magnetic
flux Φ1 and the magnetic flux 22 is hindered. As a result, the magnetic flux density in the
magnetic gaps 25 and 26 is reduced, and a sufficient driving force can not be obtained.
[0086]
On the other hand, when the magnetic pole directions of the first magnet 20 'and the second
magnet 21' are opposite to each other, the magnetic flux flowing from the first magnet 20 'and
the second magnet 21' as shown in FIG. 6B. Is the same as the passage shown in FIG. 6A. The
magnetic flux 3 3 flowing from the second magnet 21 ′ flows from the upper surface of the
yoke 22 through the vertical portion 22 ′, flows through the second magnetic gap 26, and
reaches the second magnetic plate 24. However, the magnetic flux Φ 4 flowing from the first
magnet 20 ′ flows from the bottom of the yoke 22 through the vertical portion 22 ′, flows
through the first magnetic gap 25, and reaches the first magnetic plate 23. That is, the directions
of the magnetic flux 33 and the magnetic flux 44 in the vertical portion 22 'of the yoke 22
become opposite to each other, cancel each other, and the magnetic flux density in the vertical
portion 22' becomes smaller. Thus, magnetic saturation does not occur in the vertical portion 22
′ of the yoke 22. This allows the magnetic flux density in the first and second magnetic air gaps
25 and 26 to be greatly increased.
[0087]
In FIG. 7A, the magnetic flux density distribution of the first magnetic gap 25 when the first
magnet 20 and the second magnet 21 having the same magnetic pole direction are used is
shown by a magnetic flux density distribution I, and the magnetic pole directions are opposite.
The magnetic flux density distribution of the first magnetic gap 25 when the first magnet 20 'and
the second magnet 21' are used is indicated by a magnetic flux density distribution II. As shown
in FIG. 7A, the maximum value of the magnetic flux density of the first magnetic gap 25 is 0.36 T
in the magnetic flux density distribution I, and is 0.67 T in the magnetic flux density distribution
II. It can be seen that an increase in magnetic flux density of 0.31 T can be realized by using the
magnet 20 'and the second magnet 21'.
[0088]
02-05-2019
23
Further, in FIG. 7B, the magnetic flux density distribution of the second magnetic gap 26 in the
case of using the first magnet 20 and the second magnet 21 having the same magnetic pole
direction is indicated by a magnetic flux density distribution III, and the magnetic pole direction
is The magnetic flux density distribution of the second magnetic air gap 26 in the case of using
the opposite first magnet 20 'and second magnet 21' is shown by a magnetic flux density
distribution IV. As shown in FIG. 7B, the maximum value of the magnetic flux density of the
second magnetic gap 26 is 0.5 T in the magnetic flux density distribution III, and is 0.77 T in the
magnetic flux density distribution IV. It can be seen that an increase in magnetic flux density of
0.27 T can be realized by using the magnet 20 'and the second magnet 21'. By increasing the
magnetic flux density of the first and second magnetic air gaps 25 and 26, the driving force
generated in the first and second voice coils 27 and 28 can be increased to generate a larger
sound. Can. For this reason, even if it is small, the speaker which can generate a loud sound is
realizable.
[0089]
In the speaker 1300, a cover 32 and an acoustic tube 34 (FIGS. 1A and 1B) may be provided.
Also, at least one of the first acoustic tube 76 and the second acoustic tube 79 (FIGS. 3A and 3B)
may be provided.
[0090]
Fifth Embodiment A portable terminal device 2000 according to a fifth embodiment of the
present invention will be described with reference to FIGS. 8A, 8B and 8C. 8A is a top view of the
portable terminal device 2000, FIG. 8B is a partial cross-sectional view of the portable terminal
device 2000, and FIG. 8C is a bottom view of the portable terminal device 2000.
[0091]
In the present embodiment, mobile terminal apparatus 2000 is described as a mobile phone, but
mobile terminal apparatus 2000 is not limited to a mobile phone. For example, a notebook
computer, PDA (Personal Digital Assistant), pager (Registered trademark) and a watch etc. may
be used.
[0092]
02-05-2019
24
The portable terminal device 2000 is attached to a first casing 540, a second casing 541, a
display unit 542 provided in the second casing 541, and a first casing 540. An antenna 543 for
reception and the speaker 1300 described in Embodiment 4 are provided.
A first sound hole 545 and a second sound hole 546 are formed in the second housing 541.
[0093]
In the speaker 1300, the second casing is arranged such that the first diaphragm 29 and the first
sound hole 545 face each other, and the second diaphragm 30 and the second sound hole 546
face each other. It is provided in 541. Note that, instead of the speaker 1300, a speaker obtained
by removing the acoustic tubes 34, 53, 76 and 79 from the speakers 1000, 1100 and 1200
shown in the first to third embodiments may be applied.
[0094]
The first casing 540 and the second casing 541 incorporate an electric circuit (not shown) such
as a receiving circuit. The first housing 540 and the second housing 541 are connected so as to
be bendable at their connection portions.
[0095]
Next, the operation of the portable terminal device 2000 will be described. The operation of the
speaker 1300 is as described above.
[0096]
The reception sound generated from the first diaphragm 29 is applied to the first voice coil 27
connected to the first diaphragm 29 of the speaker 1300 by applying an electric signal
representing the reception sound to the first voice coil 27. It is emitted from the sound hole 545.
02-05-2019
25
In this case, the speaker 1300 functions as a receiver that reproduces the receiving sound.
[0097]
Further, by applying an electrical signal indicating a ringtone, music, voice or the like to the
second voice coil 28 connected to the second diaphragm 30 to indicate an incoming call, from
the second diaphragm 30 The generated ringtone, music or voice is emitted from the second
sound hole 546. In this case, the speaker 1300 functions as a loudspeaker that reproduces a ring
tone, music or voice.
[0098]
In the conventional portable terminal device, the speaker functioning as a receiver for
reproducing a received sound and the speaker for a loudspeaker for reproducing a ringing tone
etc. are provided as separate units in a housing. Since the magnetic circuit of each unit exists
separately, the mounting space of the speaker was large. Therefore, conventionally, it has been
difficult to reduce the size and thickness of the portable terminal device. However, since the
speaker 1300 of the present invention is provided with a plurality of diaphragms, all the sound
can be reproduced by one speaker. Further, since the speaker 1300 has one magnetic circuit for
a plurality of diaphragms, the mounting space is reduced, and downsizing and thinning of the
portable terminal device 2000 are realized.
[0099]
Further, since the speaker 1300 of the present invention can generate a loud sound, the portable
terminal 2000 of the present invention can generate a larger amount of sound as compared with
the conventional portable terminal having the same size speaker. Can be generated. In addition,
since a loud sound can be generated, the size of the speaker 1300 can be reduced, and the
volume occupied by the speaker in the mobile terminal device 2000 can be further reduced.
[0100]
The display portion 542 may be a polygon such as a rectangle. The bottom shape of the speaker
02-05-2019
26
1300 shown in FIG. 5A is round but may be rectangular or elliptical. In this case, the long side
direction of the speaker 1300 is parallel to one side of the outer peripheral portion of the display
portion 542 If the display unit 542 is arranged as described above, the display unit 542 can be
enlarged to the short side direction side of the speaker 1300, and the display unit 542 can be
enlarged.
[0101]
Next, referring to FIG. 9, a speaker 1301 which is a modification of the speaker 1300 will be
described.
[0102]
As shown in FIG. 9, the speaker 1301 is provided in the case 541 of the portable terminal device
2000.
The speaker 1301 includes a first diaphragm 29 ′ connected to the first voice coil 27, a frame
31 ′ supporting outer peripheral portions of the first diaphragm 29 ′ and the second magnet
21 ′, and a second diaphragm 31 ′. And a frame 31 ′ ′ supporting an outer peripheral
portion of the second magnet 21 ′. A plurality of first sound holes 37 'and second sound holes
38' are formed in the frames 31 'and 31' '. The other components of the speaker 1301 are the
same as those of the speaker 1300.
[0103]
The basic operation of the speaker 1301 is the same as that of the speaker 1300. The difference
between the speaker 1301 and the speaker 1300 is that the outer diameter of the first
diaphragm 29 'is smaller than the outer diameter of the second diaphragm 30, and accordingly
the outer diameter of the frame 31' is also smaller. It is. Thus, the outer diameter of the upper
surface portion of the speaker 1301 facing the first sound hole 545 adjacent to the display
portion 542 can be reduced. As a result, the size of the display unit 542 that displays image
information such as electronic mail and video can be increased. The speaker 1301 is also
effective when sufficient space for providing a speaker around the display portion 542 can not
be secured. In the present embodiment, when the speaker 1301 is used as a receiver, sound is
generated from the first diaphragm 29 '. There is no need for the first diaphragm 29 'to generate
a loud sound like a loudspeaker since the user's normal listening operation is performed with the
02-05-2019
27
ear in contact with the first sound hole 545. . For this reason, no problem occurs when the
volume is somewhat insufficient due to the small outer diameter of the first diaphragm 29 '.
[0104]
Further, since the outer diameter of the first voice coil 27 is small, the edge of the first
diaphragm 29 'becomes wider, and as a result, the lowest resonance frequency of the first
diaphragm 29' can be lowered. . It is desirable that the lowest resonance frequency of the first
diaphragm 29 ′ be lower than the lowest resonance frequency of the second diaphragm 30. By
lowering the lowest resonance frequency of the first diaphragm 29 ', the sound pressure level in
the low frequency range of the first diaphragm 29' is improved. For this reason, it is possible to
prevent the shortage of the bass range that occurs due to the sound leaking in the gap between
the user's ear and the first sound hole 545.
[0105]
Next, the operation of portable terminal device 2000 will be further described with reference to
FIG. FIG. 10 is a block diagram showing the inside of the portable terminal device 2000. As
shown in FIG.
[0106]
The portable terminal device 2000 outputs a signal output unit 581 for outputting an electric
signal based on the radio signal received by the antenna 543, and outputs the electric signal to
the first voice coil 27 or to the second voice coil 28. And a selection unit 85 for selecting output.
The first electroacoustic transducer 83 of the speaker 1300 includes a first diaphragm 29, a first
voice coil 27, and a magnetic circuit. The second electroacoustic transducer 84 includes a first
diaphragm 30, a second voice coil 28, and a magnetic circuit. The magnetic circuit of the speaker
1300 is formed of a first magnet 20 ′, a second magnet 21 ′, a first magnetic plate 23, a
second magnetic plate 24, and a yoke 22, and the first electroacoustic transducer 83 and the first
It is shared with the second electroacoustic transducer 84.
[0107]
02-05-2019
28
The antenna 543 receives a radio signal sent from the outside (for example, a relay station of a
mobile phone). The wireless signal indicates incoming call, received sound, music, voice, image,
video and the like.
[0108]
First, when the antenna 543 receives a radio signal indicating an incoming call, the signal output
unit 581 outputs a selection signal C1 indicating an incoming call and a ringing tone signal
indicating a ringing tone in order to notify the user of the incoming call. In response to the
selection signal C1, the selection unit 85 selects the second electro-acoustic conversion unit 84,
and supplies the output ringing tone signal to the second electro-acoustic conversion unit 84.
The ringing tone signal may be a signal indicating a preset ringing tone or an audio signal
obtained by data distribution or the like. The second electroacoustic transducer 84 reproduces a
ringtone by being supplied with a ringtone signal. When the receiver knows that an incoming call
has been made and the portable terminal device 2000 can receive an incoming call, the signal
output unit 581 outputs the selection signal C1 again, and the selection unit 85 selects the first
electro-acoustic conversion unit 83 and outputs the signal output unit. A received sound signal
indicating the received sound (speaker's speech) output from the unit 581 is supplied to the first
electro-acoustic transducer 83. The first electroacoustic transducer unit 83 reproduces the
receiving sound by being supplied with the receiving sound signal.
[0109]
As described above, speaker 1300 has two functions of a receiver and a loudspeaker by
selectively switching the output destination of the incoming signal and the receiving sound signal
output from signal output unit 581 by selecting unit 85. Operates as an electroacoustic
transducer.
[0110]
In the above description, the electric signal applied to the second electroacoustic transducer 84 is
a ringing tone signal, but it may be a receiving sound signal, a music signal indicating music, or
an audio signal indicating voice. Good.
In this case, it is possible to reproduce, for example, a music signal obtained from music
02-05-2019
29
distribution. Furthermore, if the second electro-acoustic transducer 84 reproduces the received
sound signal, it becomes possible to talk with the transmitting side hands-free without bringing
the portable terminal 2000 into contact with the ear.
[0111]
In the present embodiment, the reception sound signal is used as a signal used for a telephone
call, and the voice signal is distinguished as a signal indicating a voice obtained by data
distribution other than the reception sound signal etc. However, the reception sound signal is
used. May be considered to be included in the audio signal.
[0112]
Further, in the portable terminal device 2000, the electric signal applied to the speaker 1300 is
directly output from the signal output unit 581, but the ringing tone signal is, for example, a
ringing tone signal provided separately from the signal output portion 581. It may be output
from an output unit (not shown).
Such a ringing tone signal output unit stores the music signal and the voice signal obtained by
data distribution or the like, and outputs it as a ringing tone signal.
[0113]
Furthermore, in the portable terminal device 2000, one selection unit 85 switches the signal path
between the signal output to the first electroacoustic transducer unit 83 and the signal output to
the second electroacoustic transducer unit 84. Although divided, signal paths from the antenna
543 to the first and second electroacoustic transducers 83 and 84 may be provided separately.
[0114]
Sixth Embodiment A portable terminal 2100 according to a sixth embodiment of the present
invention will be described with reference to FIGS. 11A, 11 B and 11 C.
11A is a top view of the mobile terminal device 2100, FIG. 11B is a partial cross-sectional view of
the mobile terminal device 2100, and FIG. 11C is a bottom view of the mobile terminal device
02-05-2019
30
2100.
[0115]
Although mobile terminal apparatus 2100 is described as a mobile telephone in this
embodiment, mobile terminal apparatus 2100 is not limited to a mobile telephone as in mobile
terminal apparatus 2000.
[0116]
A portable terminal device 2100 includes a housing 101, a display unit 103 provided in the
housing 101, an antenna 102 for reception attached to the housing 101, and the speaker 1000
described in the first embodiment. Equipped with
A first sound hole 106 and a second sound hole 107 are formed in the housing 101. The housing
101 incorporates an electric circuit (not shown) such as a connector and a receiving circuit.
[0117]
In the speaker 1000, the inside of the housing 101 is set so that the opening 36 of the sound
tube 34 and the first sound hole 106 face each other, and the second diaphragm 30 and the
second sound hole 107 face each other. Provided in In addition, at least a part of the speaker
1000 is provided between the display portion 103 and the bottom of the housing 101. Note that,
instead of the speaker 1000, a speaker in which the speakers 1100, 1200 and 1300 shown in
the second to fourth embodiments and the acoustic tube 34 are combined may be applied.
[0118]
Next, the operation of the portable terminal device 2100 will be described. The operation of the
speaker 1000 is as described above.
[0119]
02-05-2019
31
The reception sound generated from the first diaphragm 29 is applied to the first voice coil 27
connected to the first diaphragm 29 of the speaker 1000 by applying an electrical signal
representing the reception sound to the first voice coil 27. It is emitted from the sound hole 106.
In this case, the speaker 1000 functions as a receiver that reproduces the receiving sound.
[0120]
Also, an incoming signal generated from the second diaphragm 30 by applying an electrical
signal indicating a ringing tone, music, voice or the like to the second voice coil 28 connected to
the second diaphragm 30. Sound, music, voice or the like is emitted from the second sound hole
107. In this case, the speaker 1000 functions as a loudspeaker that reproduces a ring tone, music
or voice.
[0121]
The acoustic tube 34 is provided at a position where the throat portion 35 is off the center of the
first diaphragm 29, and the opening 36 extends to the first sound hole 106. The throat portion
35 may be provided in the outer circumferential direction than the outer diameter of the first
voice coil 27. In addition, the throat portion 35 may be provided on the frame 31. By providing
the acoustic tube 34 in the speaker 1000, it is not necessary to provide the magnetic circuit of
the speaker 1000 at the position where the first sound hole 106 of the housing 101 is formed,
and the magnetic circuit of the speaker 1000 can be displayed in the display portion 103. And
the bottom of the housing 101. Therefore, even if the size of the speaker 1000 is large, it can be
provided in the housing 101. Further, by making the acoustic tube 34 project from the cavity 33,
the distance between the magnetic circuit portion of the speaker 1000 and the opening 36 of the
acoustic tube 34 is increased, and the magnetic circuit portion of the speaker 1000 and the
acoustic tube 34 are expanded. It is possible to provide an empty space between the Further, by
providing the throat portion 35 of the acoustic tube 34 at a position deviated from the center of
the first diaphragm 29, it becomes possible to form a vacant space more efficiently. An electrical
circuit such as a receiver circuit can be provided.
[0122]
In the conventional portable terminal device, it is necessary to provide a speaker at the position
02-05-2019
32
of the sound hole formed adjacent to the display unit, and due to the problem of installation
space, it is necessary to use a small speaker inferior in acoustic characteristics. The However,
according to the present invention, as described above, a large-sized speaker can be used as
compared with the conventional case, so that the acoustic characteristics can be improved.
Further, in the present invention, it is not necessary to provide a speaker adjacent to the display
portion. Therefore, the present invention can realize upsizing of the display part which could not
be realized because the presence of the speaker is obstructive in the related art.
[0123]
Although the portable terminal device 2100 according to the present embodiment uses the
speaker 1000, which is an electrodynamic speaker using a voice coil as the electro-acoustic
conversion system, an electromagnetic speaker using an electromagnetic attraction force,
Alternatively, even in the case of a piezoelectric speaker, an electrostatic speaker or the like, the
same effect as described above can be obtained by similarly providing an acoustic tube.
[0124]
Next, the operation of portable terminal device 2100 will be further described with reference to
FIG.
FIG. 12 is a block diagram showing the inside of the mobile terminal device 2100.
[0125]
The portable terminal device 2100 outputs a signal output unit 581 for outputting an electric
signal based on the radio signal received by the antenna 102, and outputs the electric signal to
the first voice coil 27 or to the second voice coil 28. And a selection unit 85 for selecting output.
The first electroacoustic transducer 123 of the speaker 1000 includes a first diaphragm 29, a
first voice coil 27, and a magnetic circuit. The second electroacoustic transducer 124 includes a
first diaphragm 30, a second voice coil 28, and a magnetic circuit. The magnetic circuit of the
speaker 1000 is formed of the first magnet 20, the second magnet 21, the first magnetic plate
23, the second magnetic plate 24, and the yoke 22, and the first electroacoustic transducer 123
and the second It is shared with the electroacoustic transducer 124.
02-05-2019
33
[0126]
The antenna 102 receives a radio signal sent from the outside (for example, a relay station of a
mobile phone). The wireless signal indicates incoming call, received sound, music, voice, image,
video and the like.
[0127]
First, when the antenna 102 receives a radio signal indicating an incoming call, the signal output
unit 581 outputs a selection signal C1 indicating an incoming call and a ringing tone signal
indicating a ringing tone in order to notify the user of the incoming call. In response to the
selection signal C1, the selection unit 85 selects the second electroacoustic transducer 124, and
supplies the output ringing tone signal to the second electroacoustic transducer 124. The ringing
tone signal may be a signal indicating a preset ringing tone or an audio signal obtained by data
distribution or the like. The second electroacoustic transducer 124 reproduces a ringtone by
being supplied with a ringtone signal. When the receiver knows that an incoming call has been
made and the portable terminal device 2100 can receive the signal, the signal output unit 581
outputs the selection signal C1 again, and the selection unit 85 selects the first electro-acoustic
conversion unit 123, and the signal output unit A received sound signal indicating a received
sound output from 581 is supplied to the first electroacoustic transducer 123. The first
electroacoustic transducer 123 reproduces the receiving sound by being supplied with the
receiving sound signal. An incoming sound generated from the first diaphragm 29 of the first
electroacoustic transducer 123 is transmitted through the inside of the acoustic tube 34 and
emitted from the first sound hole 106.
[0128]
As described above, by selectively switching the output destination of the incoming signal and
the receiving sound signal output from signal output unit 581 by selection unit 85, speaker 1000
has two functions of a receiver and a loudspeaker. Operates as an electroacoustic transducer.
[0129]
In the above description, the electric signal applied to the second electroacoustic transducer 124
is the ringing tone signal, but it may be a receiving sound signal, a music signal indicating music,
or an audio signal indicating voice. Good.
02-05-2019
34
In this case, it is possible to reproduce, for example, a music signal obtained from music
distribution. Furthermore, if the second electro-acoustic transducer 124 reproduces the received
sound signal, it becomes possible to talk with the transmitting side hands-free without bringing
the ear into contact with the portable terminal device 2100.
[0130]
Further, in the portable terminal device 2100, the electric signal applied to the speaker 1000 is
directly output from the signal output unit 581, but the ringing tone signal is, for example, a
ringing tone signal provided separately from the signal output portion 581. It may be output
from an output unit (not shown). Such a ringing tone signal output unit stores the music signal
and the voice signal obtained by data distribution or the like, and outputs it as a ringing tone
signal.
[0131]
Furthermore, in the portable terminal device 2100, one selection unit 85 switches the signal path
between the signal to be output to the first electroacoustic transducer 123 and the signal to be
output to the second electroacoustic transducer 124. Although divided, signal paths from the
antenna 102 to the first and second electroacoustic transducers 123 and 84 may be separately
provided.
[0132]
Seventh Embodiment A portable terminal device 2200 according to a seventh embodiment of the
present invention will be described with reference to FIGS. 13A and 13B.
13A is a top view of a part of the portable terminal device 2200, and FIG. 13B is a cross-sectional
view of the portable terminal device 2200 along dotted line i-j shown in FIG. 13A.
[0133]
Although mobile terminal apparatus 2200 is described as a mobile telephone in this
embodiment, mobile terminal apparatus 2200 is not limited to a mobile telephone as in mobile
02-05-2019
35
terminal apparatus 2000.
[0134]
The portable terminal device 2200 includes the housing 131, the polygonal display portion 103
provided in the housing 131, and the receiving antenna 140 attached to the housing 131 as
described in the third embodiment. A speaker 1200 and a speaker 138 functioning as a receiver
are provided.
The housing 131 is formed with a rectangular first sound hole 136 and a rectangular second
sound hole 137. The longitudinal directions of the first sound hole 136 and the second sound
hole 137 are parallel to one side of the outer peripheral portion of the display unit 103,
respectively. The housing 131 incorporates an electric circuit (not shown) such as a connector
and a receiving circuit.
[0135]
In the speaker 1200, the opening 78 of the first sound tube 76 and the first sound hole 136 face
each other, and the opening 81 of the second sound tube 79 and the second sound hole 137 face
each other. As such, it is provided in the housing 131. The opening 78 of the first acoustic tube
76 may be connected to the first sound hole 136, and the opening 81 of the second acoustic tube
79 may be connected to the second sound hole 137. In addition, at least a part of the speaker
1200 is provided between the display portion 103 and the bottom surface portion of the housing
131. Note that, instead of the speaker 1200, a speaker combining the speakers 1000, 1100 and
1300, the first acoustic tube 76 and the second acoustic tube 79 described in the first, second
and fourth embodiments may be applied. .
[0136]
The operation of portable terminal device 2200 will now be described. The operation of the
speaker 1200 is as described above.
[0137]
02-05-2019
36
The portable terminal device 2200 of the present embodiment is provided with the speaker 138
functioning as a receiver, and the reception sound is reproduced by the speaker 138 like a
conventional portable terminal device. In portable terminal device 2200, a ringtone, music, voice
or the like is emitted from first and second sound holes 136 and 137 by applying an electrical
signal indicating the ringtone, music or voice to speaker 1200. . In this case, the speaker 1200
functions as a loudspeaker that reproduces a ring tone, music or voice.
[0138]
As described in the third embodiment, the speaker 1200 has the first and second magnetic air
gaps 67 and 68 equal in size, the first and second voice coils 69 and 70, and the first and second
voice coils. The two diaphragms 71 and 72 are also equal in size. As a result, the acoustic
characteristics emitted from both the first sound hole 136 and the second sound hole 137 can be
made substantially equal. Also, if the same electrical signal is applied to the first voice coil 69 and
the second voice coil 70, for example, even if the power consumption is the same as compared
with a conventional loudspeaker having only one diaphragm, for example, The sound pressure
level can be improved by about 3 dB. Furthermore, the speaker 1200 can reproduce audio
signals of a plurality of channels. For example, in the case of reproducing an audio signal
indicating stereo music, when a music signal of the right channel is applied to the first voice coil
69 and a music signal of the left channel is applied to the second voice coil 70, the first sound
hole 136 and the second sound hole 136 The stereo music is reproduced from the sound hole
137 of.
[0139]
Further, since the first and second acoustic tubes 76 and 79 extend in the direction substantially
orthogonal to the vibration directions of the first and second diaphragms 71 and 72, the shape of
the entire speaker 1200 is It becomes thin. Accordingly, even if the speaker 1200 is disposed
between the display unit 132 and the bottom surface of the housing 131, a thin, high-volume,
high-sound quality portable terminal capable of stereo reproduction without increasing the
thickness of the portable terminal device 2200. An apparatus 2200 can be realized.
[0140]
Although the portable terminal device 2200 of this embodiment uses the speaker 1200, which is
02-05-2019
37
an electrodynamic speaker using a voice coil as the electro-acoustic conversion system, an
electromagnetic speaker using an electromagnetic attraction force, Alternatively, even in the case
of a piezoelectric speaker, an electrostatic speaker or the like, the same effect as described above
can be obtained by similarly providing an acoustic tube.
[0141]
Next, with reference to FIG. 14, the operation of portable terminal device 2200 will be further
described.
FIG. 14 is a block diagram showing the inside of the portable terminal device 2200.
[0142]
The portable terminal device 2200 further includes a signal output unit 141 for outputting an
electrical signal to the first voice coil 69 and the second voice coil 70 based on the radio signal
received by the antenna 140. The first electroacoustic transducer 144 of the speaker 1200
includes a first diaphragm 71, a first voice coil 69, and a magnetic circuit. The second
electroacoustic transducer 145 includes a first diaphragm 72, a second voice coil 70, and a
magnetic circuit. The magnetic circuit of the speaker 1200 is formed of the magnet 60, the first
magnetic plate 61, the second magnetic plate 62, and the yoke 63, and is shared by the first
electroacoustic transducer 144 and the second electroacoustic transducer 145. Ru.
[0143]
The antenna 140 receives a radio signal sent from the outside (for example, a relay station of a
mobile phone). The wireless signal indicates incoming call, received sound, music, voice, image,
video and the like.
[0144]
First, when the antenna 140 receives a radio signal indicating an incoming call, the signal output
02-05-2019
38
unit 141 outputs a ringing tone signal indicating a ringing tone to the first electroacoustic
transducer 144 and the second electroacoustic transducer 144 in order to notify the user of the
incoming call. Output to the electro-acoustic transducer unit 145 of FIG. The ringing tone signal
may be a signal indicating a preset ringing tone or an audio signal obtained by data distribution
or the like. The first electro-acoustic transducer 144 and the second electro-acoustic transducer
145 reproduce the ringing tone when the ringing tone signal is supplied. In this case, if the
ringing tone signal is a stereo signal, stereo ringing tones are reproduced from the speaker 1200.
Next, when the receiver knows that an incoming call has arrived and the portable terminal device
2200 can receive the signal, the signal output unit 141 outputs the ringing tone signal to the
first electroacoustic transducer 144 and the second electroacoustic transducer 145. Stop. At the
same time, the signal output unit 141 outputs a received sound signal indicating a received
sound to the speaker 138. The speaker 138 reproduces the receiving sound by being supplied
with the receiving sound signal.
[0145]
In the above description, the electric signal applied to the speaker 1200 is a ringing tone signal,
but it may be a receiving sound signal, a music signal indicating music, or an audio signal
indicating voice. In this case, for example, the portable terminal device 2200 can reproduce a
stereo music signal obtained from music distribution. Furthermore, if the speaker 1200 is made
to reproduce a received sound signal, a large reproduction sound can be obtained from the two
diaphragms of the first diaphragm 71 and the second diaphragm 72, so even in a use
environment where the noise is large. Enables clear, hands-free conversation.
[0146]
Further, in the portable terminal device 2200, the electric signal applied to the speaker 1200 is
directly output from the signal output unit 141, but the ring tone signal is, for example, a ring
tone signal provided separately from the signal output unit 141. It may be output from an output
unit (not shown). Such a ringing tone signal output unit stores the music signal and the voice
signal obtained by data distribution or the like, and outputs it as a ringing tone signal.
[0147]
Eighth Embodiment A portable terminal device 2300 according to an eighth embodiment of the
02-05-2019
39
present invention will be described with reference to FIG. The mobile terminal device 2300 is a
modification of the mobile terminal device 2200 shown in FIGS. 13A and 13B, and includes a
speaker 1201 instead of the speaker 1200. The other components are the same as those of the
portable terminal device 2200. FIG. 15 is a top view in which a part of the mobile terminal device
2300 is cut away. FIG. 15 shows only the attachment state of the speaker 1201 to the housing
131 for simplification of the description.
[0148]
Although mobile terminal apparatus 2300 is described as a mobile telephone in this
embodiment, mobile terminal apparatus 2300 is not limited to a mobile telephone as in mobile
terminal apparatus 2000.
[0149]
The speaker 1201 is configured such that the first acoustic pipe 152 and the second acoustic
pipe 153 are provided instead of the first acoustic pipe 76 and the second acoustic pipe 79 in
the loudspeaker 1200 shown in FIGS. 3A and 3B. It has become.
The other components are similar to those of the speaker 1200. Similar to the speaker 1200 of
the seventh embodiment, the speakers 1000, 1100 and 1300 described in the first, second and
fourth embodiments may be applied as the speaker 1201.
[0150]
The first acoustic tube 152 and the second acoustic tube 153 are provided on the side of the
speaker 1201 and emit sound from the first opening 154 and the second opening 155. The
shape of the first acoustic tube 152 and the second acoustic tube 153 is a horn whose crosssectional area gradually increases in the direction from the side surface of the speaker 1201
toward the first opening 154 and the second opening 155, respectively. It has a shape. Although
not shown here, the first opening 154 and the second opening 155 are provided on both sides of
the display unit 103 as in the mobile terminal device 2200. The first opening 154 is connected to
the first sound hole 136, and the second opening 155 is connected to the second sound hole
137. The first sound hole 136 and the second sound hole 137 are formed in the same plane as
the display unit 103.
02-05-2019
40
[0151]
The operation of portable terminal apparatus 2300 will now be described. The basic operation of
the speaker 1201 is similar to that of the speaker 1200.
[0152]
The first acoustic tube 76 and the second acoustic tube 79 provided in the speaker 1200 have a
straight shape with a substantially constant cross-sectional area. On the other hand, the first
acoustic pipe 152 and the second acoustic pipe 153 included in the speaker 1201 gradually
increase in sectional area in the direction from the side surface of the speaker 1201 toward the
first opening 154 and the second opening 155, respectively. The horn shape becomes large. As a
result, the volume occupied by the first acoustic tube 152 and the second acoustic tube 153 can
be increased, but compared with the first acoustic tube 76 and the second acoustic tube 79
having a constant cross-sectional area, the first acoustic tube The acoustic load applied to the
diaphragm 71 and the second diaphragm 72 is reduced, and the sound pressure level radiated
from the first opening 154 and the second opening 155 can be improved.
[0153]
Further, the lateral width W2 of the first and second openings 154 and 155 of the speaker 1201
in FIG. 15 may be similar to the lateral width W1 of the first and second openings 78 and 81 of
the speaker 1200. In this case, the horn-shaped first acoustic tube 152 and the second acoustic
tube 153 are realized by gradually extending the longitudinal direction of the cross section from
L1 to L2. In this case, the sound source length increases and the directivity is sharpened in the
long side direction, and the sound source length decreases and the directivity is wide in the short
side direction. Therefore, the acoustic radiation in a specific direction may be strengthened or
weakened. It becomes possible. For example, when a plurality of people listen to music
reproduced from one portable terminal device 2300 shown in FIG. 15, the horizontal width of the
first opening 154 and the second opening 155 is short, so the sound in the horizontal direction is
It has wide directivity, and it becomes possible to listen to music with the same playback sound
quality regardless of the listening position. On the other hand, since the longitudinal direction is
the longitudinal direction, the directivity of the sound is narrowed, and the acoustic energy
radiation to the person around the longitudinal direction is reduced. In this way, a mobile
terminal device can be realized in which acoustic energy radiation in a specific direction is
02-05-2019
41
enhanced or reduced.
[0154]
Embodiment 9 A portable terminal device 2400 according to Embodiment 9 of the present
invention will be described with reference to FIG. The portable terminal device 2400 is a
modification of the portable terminal device 2300 shown in FIG. 15 and includes a speaker 1202
instead of the speaker 1201. The other components are the same as those of the mobile terminal
device 2300. FIG. 16A is a top view in which a part of the mobile terminal device 2300 is cut
away. FIG. 16B is a cross-sectional view of the speaker 1202 and the housing 131 along the
dotted line k-l shown in FIG. 16A.
[0155]
In the present embodiment, mobile terminal apparatus 2300 is described as a mobile phone, but
mobile terminal apparatus 2300 is not limited to a mobile phone as in mobile terminal apparatus
2000.
[0156]
The speaker 1202 has a configuration in which the first acoustic pipe 164 and the second
acoustic pipe 167 are provided instead of the first acoustic pipe 152 and the second acoustic
pipe 153 in the speaker 1201 shown in FIG. There is.
The other components are similar to those of the speaker 1201. Similar to the speaker 1200 of
the seventh embodiment, the speakers 1000, 1100 and 1300 described in the first, second and
fourth embodiments may be applied as the speaker 1202.
[0157]
The horn-shaped first acoustic pipe 164 and the second acoustic pipe 167 are provided on the
side of the speaker 1201 and emit sound from the first opening 165 and the second opening
168. A first acoustic volume 166 is formed in a portion of the first acoustic tube 164. The crosssectional area of the first acoustic volume 166 is larger than the cross-sectional area of the area
02-05-2019
42
adjacent to both sides of the first acoustic volume 166 of the first acoustic tube 164. A second
acoustic volume 169 is formed in part of the second acoustic tube 167. The cross-sectional area
of the second acoustic volume portion 169 is larger than the cross-sectional area of the region
adjacent to both sides of the second acoustic volume portion 169 of the second acoustic tube
167.
[0158]
Next, the operation of portable terminal apparatus 2400 will be described. The basic operation of
the speaker 1202 is similar to that of the speaker 1201.
[0159]
A first acoustic volume portion 166 is formed in a portion of the first acoustic tube 164 provided
in the speaker 1202, and a second acoustic volume portion 169 is formed in a portion of the
second acoustic tube 167. ing. The first acoustic volume portion 166 and the second acoustic
volume portion 169 act as compliance components of air to cut high-frequency components of
the sound transmitted through the first acoustic tube 164 and the second acoustic tube 167.
Operates as a high cut filter. Therefore, it is possible to acoustically attenuate high-frequency
components around 10 kHz or more, which are not required in the portable terminal device
2400, and to emit sound from the first opening 165 and the second opening 168. Therefore, the
acoustic characteristics can be controlled without using a filter of the electric circuit.
[0160]
Also, the first acoustic tube 164 and the second acoustic tube 167 may be arranged in either the
horizontal or vertical direction by utilizing the empty space inside the portable terminal device
2400. Furthermore, although the first acoustic tube 164 and the second acoustic tube 167 have
a horn shape in the present embodiment, the same effect can be obtained even if the crosssectional area is a straight shape.
[0161]
Tenth Embodiment A portable terminal 2500 according to a tenth embodiment of the present
invention will be described with reference to FIGS. 17A and 17B.
02-05-2019
43
[0162]
The portable terminal device 2500 is a modification of the portable terminal device 2300 shown
in FIG. 15, and comprises a speaker 1203 instead of the speaker 1201 and a casing 201 instead
of the casing 131.
FIG. 16A is a top view in which a part of the mobile terminal device 2500 is cut away. FIG. 17B is
a cross-sectional view of the speaker 1203 and the housing 201 along dotted line m-n shown in
FIG. 17A.
[0163]
The speaker 1203 has a configuration obtained by removing the first acoustic pipe 152 and the
second acoustic pipe 153 from the loudspeaker 1201 shown in FIG. The other components are
similar to those of the speaker 1201. A first acoustic pipe 203 and a second acoustic pipe 206
are integrally formed in the housing 201. The first acoustic tube 203 has a first throat 204 and a
first opening 205. The second acoustic tube 206 has a second throat 207 and a second opening
208. The other components of the portable terminal device 2500 are the same as those of the
portable terminal device 2300. Similar to the speaker 1200 of the seventh embodiment, the
speakers 1000, 1100 and 1300 described in the first, second and fourth embodiments may be
applied as the speaker 1203.
[0164]
Although mobile terminal apparatus 2500 is described as a mobile telephone in this
embodiment, mobile terminal apparatus 2500 is not limited to a mobile telephone as in mobile
terminal apparatus 2000.
[0165]
Next, the operation of portable terminal device 2500 will be described.
02-05-2019
44
The basic operation of the speaker 1203 is similar to that of the speaker 1201.
[0166]
In the portable terminal device 2500 of this embodiment, the housing 201, the first acoustic pipe
203 and the second acoustic pipe 206 are integrally formed. Therefore, the speaker 1203 and
the first acoustic tube 203 and the second acoustic tube 206 are separate units. When attaching
the speaker 1203 to the portable terminal device 2500, the sound outlet provided on the frame
side surface of the speaker 1203 (for example, the first sound hole 37 and the second sound
when the speaker 1300 shown in FIG. 5B is used as the speaker 1203) By connecting the hole 38
and the like to the first throat portion 204 and the second throat portion 207, sound
reproduction similar to that of the portable terminal device 2300 shown in FIG. 15 becomes
possible. In the portable terminal device 2500, the wall surfaces of the first acoustic pipe 203
and the second acoustic pipe 206 are shared with the housing 201, so that further downsizing of
the portable terminal device 2500 can be realized. By integrally forming the first acoustic pipe
203 and the second acoustic pipe 206 in the housing 201, the configuration of the speaker 1203
can be simplified, and a portable terminal device 2500 can be realized that achieves more space
saving.
[0167]
In the present embodiment, the first acoustic tube 203 and the second acoustic tube 206 have a
horn shape, but even if they have a straight shape with a constant cross-sectional area.
Furthermore, the first acoustic volume portion 166 and the second acoustic volume portion 169
described in the ninth embodiment may be formed in the first acoustic tube 203 and the second
acoustic tube 206.
[0168]
In the sixth to tenth embodiments, two sound holes opposed to the openings of the two acoustic
tubes are formed on both sides of the front face of the display unit of the portable terminal
device, as shown in FIG. The sound holes 221 may be formed on both sides of the housing 220 of
the portable terminal device. In this case, the width of the portable terminal device main body
can be reduced as compared with the portable terminal device in which the sound holes are
formed on both sides of the front surface of the display unit.
02-05-2019
45
[0169]
Further, as shown in FIG. 19, two sound holes 231 and 232 may be formed on the back of the
case 230 of the portable terminal device. Also in this case, the width of the portable terminal
device main body can be reduced as compared with the portable terminal devices in which the
sound holes are formed on both sides of the front surface of the display unit. As described above,
the directions of sound emission from the two diaphragms of the speaker of the present
invention can be the front direction and the back direction of the housing, or the front direction,
the side direction, and the like.
[0170]
Furthermore, as shown in FIG. 20, sound holes 242 and 243 may be provided on both sides in
the vertical direction of the display unit 103 provided in the case 240 of the portable terminal
device. In this case, the portable terminal device is used sideways at the time of reproduction of
the stereo signal, but the display unit 103 is vertically long and the distance between the sound
holes 242 and 243 is long, so the separation of the two sound sources is clearer The stereo effect
is further improved. For this reason, the acoustic effect at the time of audio signal reproduction
of a plurality of channels is enhanced. In addition, in the case where a live broadcast or the like at
a concert venue is received by a mobile phone, the reproduced video is horizontally long like the
television screen, and the side portions 103a and 103b become the upper and lower portions of
the screen. In this case, the direction of the video and the direction of the sound field of the
reproduced sound can be made to coincide.
[0171]
Further, in the sixth to tenth embodiments, the installation place of the speaker is on the back of
the display unit, but the same effect can be obtained even if the speaker can be provided in any
of the installable spaces in the portable terminal device. Be
[0172]
Eleventh Embodiment A portable terminal device 2201 according to an eleventh embodiment of
the present invention will be described with reference to FIG.
02-05-2019
46
FIG. 21 is a block diagram showing the inside of the portable terminal device 2201.
[0173]
The portable terminal device 2201 is a modification of the portable terminal device 2200 shown
in FIG. 14, and in addition to the components of the portable terminal device 2200, a sound
image adjusting unit 258 for adjusting the sound image of the sound reproduced from the
speaker 1200. Further equipped. The other components of the mobile terminal device 2201 are
the same as those of the mobile terminal device 2200.
[0174]
The antenna 140 receives a radio signal sent from the outside (for example, a relay station of a
mobile phone). The wireless signal indicates incoming call, received sound, music, voice, image,
video and the like.
[0175]
First, when the antenna 140 receives a radio signal indicating an incoming call, the signal output
unit 141 outputs a ringing tone signal indicating a ringing tone to the sound image adjusting unit
258 in order to notify the user of the incoming call. The sound image adjustment unit 258
adjusts the ringing tone signal so that the sound image of the sound reproduced from the
speaker 1200 is spread. The sound image adjustment unit 258 outputs the adjusted ringing tone
signal to the first electro-acoustic conversion unit 144 and the second electro-acoustic
conversion unit 145. The ringing tone signal may be a signal indicating a preset ringing tone or
an audio signal obtained by data distribution or the like. The first electro-acoustic transducer 144
and the second electro-acoustic transducer 145 reproduce the ringing tone when the ringing
tone signal is supplied. In this case, since the ringing tone signal is adjusted so that the sound
image is spread, the ringing tone reproduced from the first acoustic pipe 76 and the second
acoustic pipe 79 becomes a realistic sound. Next, when the receiver knows that an incoming call
has arrived and the portable terminal device 2201 can receive an incoming call, the signal output
unit 141 stops the output of the ringing tone signal to the sound image adjusting unit 258. At the
same time, the signal output unit 141 outputs a received sound signal indicating a received
02-05-2019
47
sound to the speaker 138. The speaker 138 reproduces the receiving sound by being supplied
with the receiving sound signal.
[0176]
In the above description, the electric signal applied to the speaker 1200 is a ringing tone signal,
but it may be a receiving sound signal, a music signal indicating music, or an audio signal
indicating voice. In this case, although the portable terminal device 2200 is small in size, for
example, a stereo music signal obtained from music distribution may be reproduced as a sound
with a sense of expansion of sound comparable to the music reproduction of a large sound
reproduction device. It becomes possible. Furthermore, if the electrical signal is an audio signal of
two or more channels, more realistic audio reproduction can be achieved by adjusting the signal
of each channel by the sound image adjustment unit 258.
[0177]
In the speakers having two magnetic air gaps different in size (for example, speakers 1000 and
1100 in the first and second embodiments), two voice coils having different apertures and two
vibrations having different areas are used. And a plate. In this case, the acoustic characteristics
(efficiency, reproduction frequency bandwidth, etc.) of the sound reproduced from each of the
two diaphragms can be made approximately equal by adjusting the shapes, materials, etc. of the
voice coil and the diaphragm. As a result, high-quality stereo audio reproduction is possible even
with a speaker in which the magnetic gap, the voice coil, and the diaphragm have different sizes.
[0178]
Furthermore, the frame and diaphragm of the speaker of the present invention are not limited to
a circle, but may be oval or square depending on the space in the apparatus to be mounted. In
the present invention, the cross-sectional shape from the throat of the acoustic tube to the
opening may be circular, rectangular, elliptical or any other shape.
[0179]
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48
Further, although the example in which the speaker of the present invention is mounted on a
portable terminal device has been described in the above embodiment, it is mounted on a game
machine, a personal computer, an MD player, etc. not having a receiving device. You may use as a
speaker which reproduces ¦ regenerates a sound, a music signal, an audio ¦ voice signal etc. In
this case as well, as in the case of being mounted in a portable terminal device, it is possible to
realize downsizing of the device and a small device capable of reproducing multi-channel audio
information signals including stereo signals.
[0180]
According to the present invention, the yoke for connecting the first magnet and the second
magnet is provided, and the first voice coil is provided between the first magnet and the yoke. A
speaker is provided wherein a second voice coil is provided between the second magnet and the
yoke. Thereby, the magnetic flux is mainly supplied to the first voice coil from the first magnet,
and the magnetic flux is mainly supplied to the second voice coil from the second magnet. Since
the two voice coils are driven using separate magnets, the driving force generated in each voice
coil can be increased, and a large sound can be generated.
[0181]
Further, according to the present invention, there is provided a portable terminal device provided
with the above-mentioned speaker. As described above, since the speaker of the present
invention can generate a loud sound, the portable terminal of the present invention can generate
a louder sound as compared with a portable terminal having a conventional speaker of the same
size. it can. In addition, since a loud sound can be generated, the size of the speaker can be
reduced, and the volume occupied by the speaker inside the portable terminal device can be
reduced.
[0182]
Further, according to the present invention, the first acoustic pipe provided between the first
diaphragm and the first sound hole, and the space between the second diaphragm and the
second sound hole. At least one of the provided second acoustic tubes is provided. By this, the
freedom degree of the arrangement place of the speaker inside a portable terminal device can be
enlarged.
02-05-2019
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[0183]
Further, according to the present invention, the magnetic saturation in the yoke can be prevented
by reversing the magnetic pole direction of the first magnet of the above speaker and the
magnetic pole direction of the second magnet. Thereby, more magnetic flux can be supplied to
the first and second voice coils, and a louder sound can be generated.
[0184]
Also, according to the present invention, a magnet is provided so as to surround the yoke, and a
speaker in which the first voice coil and the second voice coil are provided between the yoke and
the magnet is provided. Since both of the two voice coils for driving the two diaphragms are
provided inside the magnet, the size of the magnet can be increased outward. As a result, a large
amount of magnetic flux can be supplied to the two voice coils, and a loud sound can be
generated.
[0185]
Also, according to the present invention, there is provided a thin speaker which radiates a sound
generated from the front or back of at least one diaphragm from an arbitrary position using an
acoustic tube.
[0186]
Further, according to the present invention, the two diaphragms can be acoustically shielded by
dividing the space between the two diaphragms by using a yoke.
As a result, it is possible to realize a speaker in which two diaphragms operate independently by
an electric signal applied to each voice coil.
[0187]
02-05-2019
50
Furthermore, by making the outside diameter of the diaphragm provided opposite to the sound
hole adjacent to the display unit of the portable terminal smaller than the outside diameter of the
other diaphragm, mounting of the speaker around the display unit By further reducing the space,
the display can be made larger. By increasing the size of the display unit, it is possible to realize a
portable terminal device in which characters and images of e-mail can be viewed more easily.
[0188]
Further, by mounting the speaker of the present invention in a portable terminal device such as a
portable telephone, the function as a receiver for reproducing a reception sound signal and a
ringtone signal, a music signal and an audio signal while being one speaker. A speaker is
provided which has the function of both of the functions as a loudspeaker that reproduces etc. In
the present invention, a single speaker can perform the function conventionally performed by a
plurality of speakers, and the mounting space of the speakers can be reduced, and a smaller and
thinner mobile terminal device can be realized.
[0189]
Further, according to the present invention, the magnetic circuit of the speaker is disposed on the
back of the display unit of the portable terminal device, and the sound is emitted from the
opening of the acoustic tube having a cross-sectional area smaller than the area of the
diaphragm. Thus, a portable terminal device having a display unit with a large screen can be
realized. Furthermore, since the outer diameter of the diaphragm may be kept large, it is not
necessary to miniaturize the speaker due to the restriction of the installation space as in the
conventional portable terminal device, and a high-quality portable terminal device can be
realized.
[0190]
Further, according to the present invention, if the openings of the two sound tubes are provided,
for example, on the front and both sides of the display unit, a portable terminal device can be
realized which can reproduce ringing tone signals and music signals in stereo form in a compact
shape. it can. In addition, if an electric signal to be applied to the speaker is adjusted by the
sound image adjustment unit (for example, adjustment is made so as to expand the sound image),
02-05-2019
51
a large-sized acoustic signal may be generated even in a portable terminal device in which two
sound sources are arranged adjacent It becomes possible to reproduce a sound having a sound
image comparable to the reproduction sound of the reproduction device.
[0191]
Brief description of the drawings
[0192]
4 is a diagram showing the yoke of the speaker in the embodiment of the present invention
[0193]
FIG. 8C is a diagram showing a portable terminal device according to an embodiment of the
present invention.
[0194]
9 is a diagram showing a speaker according to an embodiment of the present invention
[0195]
10 shows a portable terminal device according to an embodiment of the present invention
[0196]
FIG. 11C is a diagram showing a portable terminal device according to an embodiment of the
present invention.
[0197]
12 is a diagram showing a mobile terminal device in the embodiment of the present invention
[0198]
14 is a diagram showing a mobile terminal device in the embodiment of the present invention
[0199]
FIG. 15 is a diagram showing a portable terminal device according to an embodiment of the
02-05-2019
52
present invention.
[0200]
18 is a diagram showing a mobile terminal device in the embodiment of the present invention
[0201]
19 is a diagram showing a mobile terminal device in the embodiment of the present invention
[0202]
Fig. 20 is a diagram showing a portable terminal device according to an embodiment of the
present invention.
[0203]
21 is a diagram showing a portable terminal device according to an embodiment of the present
invention.
[0204]
Figure 22 shows a conventional speaker
[0205]
Explanation of sign
[0206]
20 first magnet 21 second magnet 22 yoke 23 first magnetic plate 24 second magnetic plate 25
first magnetic gap 26 second magnetic gap 27 first voice coil 28 second voice coil 29 second 1
diaphragm 30 second diaphragm 31 frame 32 cover 33 cavity 34 acoustic tube 35 throat 36
opening 37 first sound hole 38 second sound hole
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