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JP2005175867

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DESCRIPTION JP2005175867
PROBLEM TO BE SOLVED: To provide a sound reproduction device capable of outputting sound
in a low frequency region with a sufficient sound pressure. SOLUTION: A vibration generating
means 3 is fixed to an elongated diaphragm 2, and a transmission member 4 is fixed to the
diaphragm 2. It is fixed to a sound producing member such as the panel 20 via the transmission
member 4. Both ends of the support member 5 provided on the vibration generating means 3 are
fixed to both ends of the diaphragm 2 and fixed to the panel 20 of the diaphragm 2 when the coil
C is energized and the support member 5 is vibrated. The vibration is amplified by the nonconnected parts 2b, 2b. As a result, the diaphragm 2 is vibrated at a low frequency, and the panel
20 can output bass. [Selected figure] Figure 2
Sound reproduction device
[0001]
The present invention relates to a sound reproducing apparatus that vibrates a sounding member
such as a transparent panel of a display unit or a housing of an electronic device to make it
sound, and more particularly to a sound reproducing apparatus that can increase sound
generation in a wide band.
[0002]
For example, Patent Document 1 below describes a panel-type sound reproduction device that
vibrates a panel to produce a sound.
[0003]
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1
The thing of the said patent document 1 piles up and installs the small panel of the area smaller
than it on a large sized panel, and the drive means is attached to this small panel.
In this sound reproducing apparatus, when the drive means is driven, the small panel vibrates,
the vibration of the small panel is transmitted to the large panel, and a wide band output can be
obtained by generating sound from the large panel and the small panel. It is said that.
Japanese Patent Application Publication No. 2002-505814
[0004]
However, the large panel has high rigidity and a relatively high band with a resonance frequency
of 1 kHz or more. Therefore, even if the volume can be secured in the high frequency range, the
amplitude of the large panel is for the low frequency range of several hundreds Hz. Can not be
large enough to get enough volume. Therefore, when a large panel is made to sound, the high
range becomes dominant, and it is difficult to obtain the sound quality like a general speaker.
[0005]
In particular, in the case where the driving means is provided at a position close to the side edge
instead of the central portion of the large panel, in a case where the periphery of the large panel
is fixed, Because the resonant frequency of the panel is high, it is difficult to increase the volume
of the bass.
[0006]
If the large panel is thin and soft, it is too soft to be disposed on the surface of the device, and the
propagation characteristics of the vibration are poor, so that it is not possible to secure a large
volume.
[0007]
The present invention solves the above-mentioned conventional problems, and can be mounted
on a sound-producing member such as a transparent panel provided in a display means or a
housing of an electronic device to enable high-volume output over a wide band from high to low
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It aims at providing a sound reproduction device.
[0008]
The present invention relates to a sound reproducing apparatus provided with a sound
generation member and a vibration generation means for giving a vibration to the sound
generation member, wherein the vibration generation means comprises a diaphragm and the
vibration at at least two connecting portions. A support member connected to a plate, and a coil
provided on one of the diaphragm and the support member, and a magnetic field generating
means provided on the other to apply a magnetic field to the coil, a part of the diaphragm is It is
characterized in that it is supported by the sounding member directly or through another
member.
[0009]
In the vibration generating means of the sound reproducing apparatus according to the present
invention, since the portion other than the connection part with the sound producing member is
substantially free, the vibration generating means vibrates with a large amplitude.
The sound generation member is forcibly vibrated by the vibration of the vibration generating
means, and a large volume of sound can be generated from the sound generation member.
In addition, the vibration generating means vibrates with a large amplitude even in a low
frequency band, and the vibration acts on the sound producing member, so that it is possible to
obtain a larger volume than in the past even in a low sound range.
[0010]
In the present invention, the diaphragm has an elongated shape in which the longitudinal length
dimension is larger than the transverse width dimension, and the diaphragm is connected to the
support member at at least two connecting portions spaced in the longitudinal direction.
Preferably, an intermediate portion between the connecting portion and the connecting portion
of the diaphragm is supported by the sound-producing member.
[0011]
In the above configuration, since the diaphragm can vibrate in the longitudinal direction with a
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large amplitude, the sound generation member can be provided with a large amplitude.
[0012]
Further, according to the present invention, the sounding member is a rectangular or square
panel, the vibration generating means is disposed in the vicinity of the side edge of the panel, and
the longitudinal direction of the diaphragm is parallel to the side edge It may be arranged as
such.
[0013]
As described above, even if the vibration generating device is disposed in the vicinity of the side
edge of the panel, it is possible to obtain loud sound emission from the panel in a wide frequency
band, and the central portion of the panel can be effectively used as a display screen or the like. .
[0014]
Further, in the present invention, it is preferable that the diaphragm is supported by the soundproduction member via a transmission member formed of a synthetic resin material.
[0015]
When the transmission member is provided, the diaphragm and the support member vibrate with
a large amplitude without being restricted by the sound generation member, and the amplitude is
efficiently transmitted to the sound generation member through the transmission member.
Become.
[0016]
Further, in the present invention, it is preferable that the flexural rigidity of the diaphragm is
lower than the flexural rigidity of the support member.
[0017]
In this configuration, although the diaphragm and the support member vibrate together in the
vibration generating means, the amplitude of the diaphragm can be set large, and it becomes
easy to give a large amplitude to the sound-producing member from the diaphragm.
[0018]
Furthermore, in the present invention, it is preferable that a resonance frequency of the
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diaphragm is set lower than a resonance frequency of the sound-producing member.
[0019]
According to this configuration, the amplitude of the diaphragm increases in the low frequency
band, and high sound volume in the low frequency range can be obtained from the sound
generation member.
[0020]
In addition, instead of the coil and the magnetic field generating means, a piezoelectric vibrator
fixed to the diaphragm may be provided.
[0021]
According to the present invention, since the diaphragm can be greatly vibrated at a low
resonance frequency and this vibration can be transmitted to the sound producing member, not
only high frequency sound but also low frequency sound can be outputted at a large volume
from the sound producing member.
[0022]
FIG. 1 is a plan view of an electronic apparatus equipped with a sound reproducing apparatus
according to an embodiment of the present invention as viewed from the sound producing side,
FIG. 2 is an exploded perspective view of the sound reproducing apparatus, and FIG. 4 is a crosssectional view taken along line 4-4 of FIG. 1, and FIG. 5 is a graph showing comparison of
characteristics of frequency bands between the present embodiment and the conventional
embodiment.
[0023]
FIG. 1 shows an electronic device 10 on which the sound reproducing apparatus of the present
invention is mounted, and a transparent panel 20 is provided on the front surface of a housing
21.
In this embodiment, the panel 20 functions as a sounding member.
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On the back side of the panel 20, the sound reproducing devices 1 are disposed inside the left
and right side edges of the panel.
An intermediate portion of the left and right sound reproducing devices 1 1 is a display seethrough area, and an FPD (flat display unit) 30 having a shape shown by a two-dot chain line in
FIG.
[0024]
The sound reproducing apparatus 1 and the sound reproducing apparatus 1 located on both the
left and right sides have the same configuration.
In the following description, the X direction is the horizontal direction, and the Y direction is the
vertical direction.
The panel 20 has a rectangular shape whose lateral dimension is longer than the longitudinal
dimension.
[0025]
As shown in FIG. 2, the sound reproducing device 1 has a vibration generating means 3.
The vibration generating means 3 is disposed in the vicinity of the side edges of the panel 20 in
parallel with the side edges of the panel 20.
[0026]
The vibration generating means 3 is configured by connecting the diaphragm 2 and the support
member 5.
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The diaphragm 2 is in the form of an elongated thin plate in which the length dimension in the
longitudinal direction (Y direction) is sufficiently larger than the width dimension in the
transverse direction (X direction).
The diaphragm 2 is formed of a plate of synthetic resin such as polycarbonate, acrylic,
polyethylene terephthalate (PET) or the like.
[0027]
The supporting member 5 is formed of a magnetic material such as a steel plate, and L-shaped
connecting portions 5a and 5a are formed at both ends in the longitudinal direction, and both
sides extending in the longitudinal direction are formed. The bent portions 5b, 5b are formed.
The dimension of the support member 5 in the longitudinal direction and the dimension of the
diaphragm 2 in the longitudinal direction are formed to be substantially the same, and the
connecting portions 5 a and 5 a of the support member 5 are adhesive agents or the like at both
ends of the diaphragm 2. It is fixed by.
Further, as shown in FIG. 3 and FIG. 4, the bent portions 5 b and 5 b of the support member 5
are set so as not to hit the diaphragm 2.
[0028]
The flexural rigidity of the diaphragm 2 is sufficiently smaller than the flexural rigidity of the
support member 5.
The resonance frequency of the diaphragm 2 is sufficiently smaller than the resonance frequency
of the panel 20. For example, the resonance frequency of the panel 20 is 1 kHz to 3 kHz, and the
resonance frequency of the diaphragm 2 is 200 Hz to 600 Hz. .
[0029]
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As shown in FIG. 3, a magnet M formed of a permanent magnet such as ferrite or a rare earth as
a magnetic field generating means is fixed to the bottom 5c of the support member 5 facing the
diaphragm 2. As shown in FIG.
The magnet M has an elongated shape in the longitudinal direction, and is fixed to the central
portion in the longitudinal direction of the support member 5.
Further, a yoke 6 formed of a magnetic material is overlapped and fixed to the magnet M.
The yoke 6 is formed to have the same area as the upper surface of the magnet M, and the yoke
6 is formed so as not to contact the diaphragm 2 when the yoke 6 and the magnet M overlap
each other.
[0030]
On the other hand, a coil C is provided on the side of the diaphragm 2 facing the support
member 5.
The coil C is wound in a rectangular frame shape with a coated copper wire or the like to be
elongated in the longitudinal direction, and is fixed to the central portion in the longitudinal
direction of the diaphragm 2 with an adhesive or the like. The coil C has a pair of longitudinal
current paths Ca and ca extending in the longitudinal direction and a pair of lateral current paths
Cb and Cb extending in the lateral direction.
[0031]
When the support member 5 is fixed to the diaphragm 2, the magnet M and the yoke 6 are
inserted so as to be positioned in the coil C. At this time, gaps G, G at minute intervals are formed
between the bent portions 5b, 5b of the support member 5 and the magnet M and the yoke 6,
and the longitudinal current of the coil C in the gaps G, G Roads Ca and Ca are located. That is,
the bent portions 5b, 5b function as opposing yokes.
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[0032]
As shown in FIG. 3, when the Z1 side of the magnet M is magnetized to the N pole and the Z2
side is magnetized to the S pole, the magnet M, the yoke 6, the gap G, the bending portion 5b of
the support member 5 and the bottom 5c. A magnetic path passing through is formed. Therefore,
as shown in FIG. 3, by supplying current to the longitudinal current path Ca on the X1 side of the
coil C toward the back side of the drawing sheet, a current in the reverse direction is applied to
the reverse longitudinal current path Ca on the X2 side. In this case, the supporting member 5 is
subjected to a force to deform in the Z2 direction. Further, by energizing in the direction opposite
to that described above, a force that causes bending deformation in the Z1 direction acts on the
support member 5. By vibrating the support member 5 in the Z1-Z2 direction in this manner, the
diaphragm 2 simultaneously vibrates in the Z1-Z2 direction.
[0033]
As the vibration generating means 3, not only the driving means utilizing magnetism but also a
piezoelectric vibrator is provided between the diaphragm 2 and the support member 5, and this
piezoelectric vibrator is the diaphragm 2 and the support member 5. And the diaphragm 2 may
be deformed by vibration. Further, a magnet and a yoke may be provided on the diaphragm 2
side, and a coil may be provided on the support member 5 side.
[0034]
Further, a pair of rising pieces are formed on the bottom 5c of the support member 5, and the
rising pieces are disposed outside the lateral current paths Cb and Cb of the coil C. A magnetic
path may be formed by the yoke 6, the magnet M and the bottom 5c.
[0035]
In the vibration generating means 3 of this embodiment, when the coil C is energized, vibrational
force acts on both the diaphragm 2 and the support member 5 so that the diaphragm 2 and the
support member 5 approach each other. It also vibrates away from each other.
That is, the vibration generating means 3 alone has an excitation function. Since the diaphragm 2
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has low flexural rigidity and both longitudinally extending ends are connected to the connecting
portions 5a and 5a of the support member 5, the diaphragm 2 uses the fixing portion at the
connecting portions 5a and 5a as a simple supporting portion. , As the center bends and vibrates.
The support member 5 also vibrates, but its amplitude is sufficiently smaller than the amplitude
of the diaphragm 2.
[0036]
In the vibration generating means 3, a part of the diaphragm 2 is indirectly supported by the
panel 20. That is, in the diaphragm 2, an intermediate portion between the connecting portion 5
a and the connecting portion 5 a is supported by the panel 20 via the transmission member 4.
[0037]
As shown in FIG. 2, in the diaphragm 2, the length dimension in the longitudinal direction (Y
direction) is a long shape longer than the width dimension in the lateral direction (X direction),
and the Z direction of the diaphragm 2 It is a shape having an area sufficiently smaller than the
vibrating surface 2a facing the surface. That is, the transmission member 4 is formed such that
the dimension in the vertical direction is longer than the dimensions in the vertical direction of
the magnet M and the yoke 6 and the dimension in the horizontal direction is shorter than the
width dimension of the diaphragm 2 The central portion in the longitudinal direction of the
diaphragm 2 is fixed with an adhesive or the like. As described above, the transmission member
4 is fixed to a part of the vibration surface 2 a of the diaphragm 2, and the non-connection
portion 2 b in which the transmission member 4 is not fixed to both sides in the Y direction of
the transmission member 4. , 2b are respectively formed.
[0038]
The transmission member 4 is formed of a synthetic resin material such as polycarbonate,
acrylic, or PET.
[0039]
In the sound reproduction device 1 of the present embodiment, an air layer Q is provided
between the transmission member 4 and the panel 20.
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The air layer Q is composed of a plate 8a and a spacer 8b. The plate member 8a is formed of a
synthetic resin and is longer than the longitudinal dimension of the transmission member 4 and
shorter than the longitudinal dimension of the diaphragm 2, and the central portion of the
transmission member 4 in the longitudinal direction and the plate member 8a It is overlapped
and adhesively fixed so that the longitudinal center part of may be matched. The spacer 8b is an
adhesive layer formed of a double-sided tape or the like having a certain thickness dimension, is
formed in a square frame shape, and is fixed to the entire peripheral portion of the plate member
8a. The other surface of the spacer 8 b is fixed to the surface of the panel 20. Thereby, the air
layer Q sealed is formed between the panel 20 and the plate member 8a. The diaphragm 2 is
adhesively fixed to the plate 8 a via the transmission member 4.
[0040]
Although the configuration in which the air layer Q is provided is illustrated and described in the
present embodiment, the transmission member 4 is directly fixed to the panel 20 without
providing the air layer Q including the plate member 8 a and the spacer 8 b. May be.
[0041]
Further, although the diaphragm 2 and the transmission member 4 are formed of separate
members, the diaphragm 2 and the transmission member 4 may be integrally formed.
[0042]
As shown in FIG. 1, in the sound reproducing apparatus 1 of the present embodiment, similar
ones are arranged at the edge of the short side of the panel 20 in the X1 direction.
The panel 20 is provided at an opening 23 formed in a housing 21 formed of a bottom plate 21a
and a side plate 21b as shown in FIGS.
The side plate 21b of the housing 21 is formed with a support portion 21c projecting inward on
the entire inner wall thereof. A damper 22 is fixed along the support portion 21c, and a
peripheral portion of the panel 20 is fixed to the bumper 22. Is elastically supported.
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[0043]
Next, the operation of the sound reproduction device 1 of the present invention will be described.
In this sound reproducing apparatus 1, when the coil C is energized based on an audio signal or a
music signal, the vibration generating means 3 generates self-vibration in the Z1-Z2 direction by
the magnetic driving force. Is oscillated in the Z1-Z2 direction. Since only the central portion of
the diaphragm 2 is partially fixed to the panel 20 in the vibration generating means 3, the nonconnecting portions 2b and 2b at both end portions of the diaphragm 2 in the Y direction which
are not fixed to the panel 20. The vibration of the support member 5 is amplified by the vibration
operation of the support member 5 to vibrate the diaphragm 2 with a large amplitude. Further,
since the diaphragm 2 is fixed to the plate member 8 a via the transmission member 4 made of
synthetic resin, the vibration of the diaphragm 2 is not excessively restrained. In addition, the
amplitude of the diaphragm 2 is reliably transmitted to the plate 8 a and the panel 20 via the
transmission member 4.
[0044]
As described above, the vibration generating means 3 is in a free state other than the bonding
portion with the transmission member 4, and when the coil C is energized, the support member 5
and the diaphragm 2 vibrate freely, and in particular the diaphragm 2 is large. It will work with
amplitude. Due to the amplitude of the diaphragm 2, the panel 20 is forcibly vibrated through
the plate member 8a, the amplitude of the panel 20 is increased, and the volume of sound
generated from the panel 20 is increased.
[0045]
Since the resonant frequency of the diaphragm 2 is low, the amplitude of the diaphragm 2 is
large even in the low sound range. By transmitting this amplitude to the panel 20, the panel 20
can exhibit a large volume in a low sound range.
[0046]
As described above, the low frequency region vibration generated in the diaphragm 2 is
transmitted to the panel 20 through the transmission member 4, and the low frequency, that is,
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the bass part of voice or music is clearly output from the panel 20. Become so. In addition, the
vibration is amplified at both ends of the diaphragm 2 and vibrated with a large amplitude, so
that a bass of larger sound pressure can be output. Further, stereo sounding becomes possible by
the left and right sound reproduction devices 1 and 1.
[0047]
FIG. 5 is a graph comparing the comparative example and the above-described embodiment in
relation to the frequency (hertz) and the sound pressure level (decibel), respectively. In FIG. 5, a
graph indicated by a dotted line is a comparative example, and a graph indicated by a solid line is
the present embodiment.
[0048]
In the comparative example, the coil C is directly fixed to the panel 20 without providing the
plate member 8a and the diaphragm 2, and the connecting portions 5a and 5a of the support
member 5 having the magnet M and the yoke 6 are fixed to the panel 20. .
[0049]
As shown in FIG. 5, in the low frequency band of less than 1 kHz in the comparative example, the
sound pressure is rapidly lowered, but this is directly vibrationally driven to the panel 20 by the
magnetism generating means by the coil C and the magnet M. Because the force is applied, the
panel 20 having a high resonance frequency can not vibrate with a large amplitude in a low
frequency band.
[0050]
On the other hand, in the embodiment of the present invention, even in a low frequency region
lower than 1 kHz, the decrease in sound pressure is not large, and a sufficient sound pressure
output can be obtained.
[0051]
In the present embodiment, by forming the air layer Q formed of the plate member 8 a and the
spacer 8 b between the transmission member 4 and the panel 20, it is possible to prevent the
reduction of the sound pressure output in the high frequency region. It has become.
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[0052]
In the sound reproducing apparatus 1 of the present invention, the panel 20 is made to be a
transparent color, and the FPD made of liquid crystal or the like is disposed at the center of the
panel 20 to make the sound reproducing apparatus 1 based on the screen displayed on the FPD.
The sound may be generated from the panel 20 by driving.
[0053]
Further, the sound producing member on which the sound reproducing apparatus 1 is mounted
is not limited to the above-described panel 20, and a vibrating member disposed inside the
housing of the electronic device or the housing of the electronic device itself Can be used as a
sounding member.
[0054]
Further, the panel 20, the diaphragm 2 and the transmission member 4 are not limited to the
same material but may be formed by combining different materials, and the frequency
characteristics can be varied by changing the combination.
For example, the diaphragm 2 can also be formed of a metal plate.
[0055]
FIG. 3 is a plan view showing an electronic apparatus equipped with the sound reproducing
apparatus according to the embodiment of the present invention, an exploded perspective view
of the sound reproducing apparatus, a cross-sectional view taken along line 3-3 in FIG. A cutaway
sectional view, a graph showing the characteristics of frequency bands,
Explanation of sign
[0056]
C coil M magnet 1 sound reproduction device 2 diaphragm 2a vibration surface 3 vibration
generating means 4 transmission member 5 support member 5a connection portion 5b bending
portion 6 yoke 10 electronic equipment 20 panel 21 housing 22 damper 30 FPD
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