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JP2006303777

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DESCRIPTION JP2006303777
A speaker device in which a center cap and a sub cone are provided to achieve a wide band, and
a speaker device capable of improving deterioration of frequency characteristics is obtained. A
speaker device 31 includes a main diaphragm 1A which receives vibrations from a voice coil 15
driven by a magnetic circuit 20 and reproduces sound, and extends in a sound radiation direction
from a central portion of the main diaphragm 1A. The auxiliary diaphragm 3B is provided so as
to close the hole in the central portion of the auxiliary diaphragm 3B and the auxiliary diaphragm
3B that reproduces the sound of the area that supplements the main diaphragm 1A, and
supplements the main diaphragm 1A and the auxiliary diaphragm 3B. And a center cap 2A for
reproducing the sound of the region, and the sub diaphragm 3B is eccentric to the center of the
voice coil 15. [Selected figure] Figure 3
Speaker device
[0001]
The present invention relates to a speaker apparatus in which a plurality of diaphragms, such as
a center cap and a sub-diaphragm, are provided in addition to the main diaphragm to achieve a
wide band of reproduced sound, and in particular, any diaphragm is eccentrically The present
invention relates to a speaker device with improved characteristics.
[0002]
Conventionally, a speaker device has been proposed in which a plurality of diaphragms such as a
center cap and an auxiliary diaphragm (sub cone) are provided in addition to the main diaphragm
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(main cone) to achieve a wider band.
Among them, a full band type speaker device called a so-called full range speaker has many
excellent points. In this full-band speaker device, since all the sound is emitted from the same
sound source, the fundamental sound and the overtone of the same sound or musical instrument
sound are separately emitted from the speakers at different positions divided for each frequency.
It is possible to completely eliminate the instability of the sound field localization at the time of
stereo reproduction due to the unnaturalness of coming, the characteristic near the crossover
frequency, and the disturbance of the phase (see, for example, Patent Document 1).
[0003]
FIG. 1 is a cross-sectional view showing an internal structure of a conventional speaker device in
which a wide band is achieved by providing a center cap and a sub cone. In FIG. 1, a cone type
speaker device 51 has a vibration structure including a main cone 1A as a main diaphragm, a sub
cone 3A as a sub diaphragm, a center cap 2A, a voice coil bobbin 17 and a voice coil 15, a yoke
13, a magnet 11. , And a magnetic circuit 20 composed of the top plate 12.
[0004]
A plate 12 made of a magnetic material such as iron and a yoke 13 are attached to the front and
back sides of the ring-shaped magnet 11. A center pole 14 integrated with the yoke 13 is
disposed in the center of the front surface of the yoke 13. A magnetic gap g is formed between
the outer peripheral surface of the center pole 14 and the inner peripheral surface of the plate
12. A frame 16 is attached to the front of the plate 12.
[0005]
Furthermore, on the side opposite to the magnet 11 of the plate 12, a roughly trumpet-shaped
main cone 1A is disposed with the large diameter portion directed in the sound radiation
direction (forward). Further, a cylindrical voice coil bobbin 17 is disposed behind the main cone
1A with the central axis aligned with the main cone 1A, and the voice coil bobbin 17 is supported
from the frame 16 by the elastic spider 18 and has an axis It is possible to move forward and
backward in the direction. The main cone 1A is fixed to the outer peripheral edge of the frame 16
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at the peripheral edge of the conical large diameter portion, and is supported by being connected
to the voice coil bobbin 17 via the sub cone 3A. The voice coil 15 is wound around the outer
peripheral surface of the voice coil bobbin 17. The voice coil bobbin 17 is disposed such that the
voice coil 15 is positioned at a predetermined position in the magnetic gap g.
[0006]
A substantially trumpet-shaped sub cone 3A is disposed with the large diameter portion directed
forward so as to extend from the central portion of the main cone 1A in the sound radiation
direction. The sub cone 3A has a conical small diameter portion connected to the small diameter
portion of the main cone 1A, and the opposite large diameter portion extends to the middle
portion of the main cone 1A. The sub cone 3A vibrates together with the main cone 1A to
reproduce high-band sound that the main cone 1A can not reproduce.
[0007]
A small diameter dome-shaped center cap 2A is provided to close the hole in the central portion
of the sub cone 3A. The center cap 2A is attached to the inside of the small diameter portion of
the sub-cone 3A with the outer peripheral edge thereof stuck around the entire circumference.
The center cap 2A vibrates together with the sub cone 3A, and reproduces a higher-band sound
that can not be reproduced by the main cone 1A or the sub cone 3A. The center cap 2A also
contributes to dustproofing the inside of the speaker device and to the improvement of the
rigidity of the main cone 1A and the central portion of the sub cone 3A.
[0008]
In the speaker device having such a configuration, the main cone 1A, the sub cone 3A, and the
center cap 2A reproduce the sound in different regions, thereby achieving a wide band of
reproduced sound, and an all-band type speaker device It is assumed.
[0009]
Conventionally, a semi-dome type speaker device has been proposed as another speaker device
for achieving a wider band.
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FIG. 2 is a cross-sectional view of the semi-dome type speaker device. In FIG. 2, the semi-dome
type speaker device 52 has a vibration structure including a dome-shaped main diaphragm 7A, a
cone-shaped outer peripheral sub-vibration plate 8A, a voice coil bobbin 17 and a voice coil 15, a
pot yoke 13, a magnet 11, And a magnetic circuit 20 consisting of the top plate 12.
[0010]
The dome-shaped main diaphragm 7A is a substantially semi-spherical (so-called semi-dome
shaped) diaphragm having an opening on the speaker side, and is integrally molded with the
outer peripheral portion auxiliary diaphragm 8A. The outer peripheral edge portion of the outer
peripheral portion auxiliary diaphragm 8A is fixed along the upper surface of the resin plate 19
forming the housing and the circumferential direction of the speaker. Further, the outer
peripheral auxiliary diaphragm 8A is fixed so as to sandwich the upper portion of the side outer
wall of the voice coil bobbin 17 in the vicinity thereof.
[0011]
The voice coil bobbin 17 has a substantially cylindrical shape, and the voice coil 15 is wound
around the outer wall thereof. The outer wall of the voice coil bobbin 17 is opposed to the inner
wall of the side surface of the substantially cylindrical crucible yoke 13 having an opening on the
upper surface, with a predetermined gap. On the other hand, the side inner wall of the voice coil
bobbin 17 is opposed to the side outer wall of the disk-like magnet 11 and the side outer wall of
the disk-like top plate 12 having a diameter slightly larger than the magnet 11 via a fixed
distance. There is. Thus, an air gap (magnetic gap g) is formed between the side outer wall of the
top plate 12 and the side inner wall of the pot yoke 13.
[0012]
In the semi-dome type speaker device 52 configured as described above, when a voice current
flows in the voice coil 15 in a uniform magnetic field, the voice coil bobbin 17 moves up and
down in the axial direction of the speaker by the principle of electromagnetic action. Vibrate.
Then, such vibration is transmitted to the dome-shaped main diaphragm 7A and the outer
peripheral portion auxiliary diaphragm 8A, and sound is emitted from both the diaphragms 7A
and 8A (for example, see Patent Document 2).
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[0013]
Patent Document 1: Japanese Patent Application Publication No. 2001-346284 Patent Document
2: Japanese Patent Application Publication No. 2004-349871
[0014]
However, in both of the cone type speaker device and the semi dome type speaker device, there
remains a problem that the frequency characteristics are deteriorated due to the divided
resonance of the diaphragm.
That is, as described above, even in the speaker device in which a plurality of diaphragms having
different bands are provided to achieve a wide band, the unsolved problem of the deterioration of
the frequency characteristics due to the divided resonance of the diaphragms is not solved yet.
And although various devices were made ¦ formed with respect to this subject conventionally, a
cheap and effective thing is not yet proposed.
[0015]
The present invention has been made to solve the problems as described above, and in a speaker
device in which a wide band is achieved by providing a center cap and a sub cone, a speaker
device capable of improving the deterioration of characteristics due to split resonance is
obtained. The purpose is
[0016]
In order to solve the problems described above and to achieve the object, the speaker device
according to claim 1 of the present invention comprises: a main diaphragm which receives
vibration from a voice coil driven by a magnetic circuit to reproduce sound; The sub-diaphragm
is provided so as to extend from the central portion of the diaphragm in the acoustic radiation
direction and reproduces the sound of the area that supplements the main diaphragm, and is
provided to close the hole in the central portion of the sub-diaphragm A speaker device having a
center cap that reproduces sound in a region that compensates for a diaphragm and a sub
diaphragm, wherein at least one of the sub diaphragm and the center cap is eccentric with
respect to the center of the voice coil. It features.
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[0017]
According to a thirteenth aspect of the present invention, there is provided a speaker apparatus
according to the thirteenth aspect of the present invention, comprising: a main diaphragm which
transmits vibration from a voice coil driven by a magnetic circuit to reproduce sound; and
extending in a sound radiation direction from a central portion of the main diaphragm. And
reproducing the sound of the area that supplements the main diaphragm, and has a subdiaphragm that is eccentric to the center of the voice coil.
[0018]
According to a fourteenth aspect of the present invention, there is provided a loudspeaker
apparatus comprising: a main diaphragm for transmitting vibration from a voice coil driven by a
magnetic circuit to reproduce sound; and a hole in a central portion of the main diaphragm And a
center cap which is decentered with respect to the center of the voice coil as well as reproducing
the sound of the area which supplements the main diaphragm.
[0019]
The speaker apparatus according to claim 20 of the present invention transmits a vibration from
a voice coil driven by a magnetic circuit to reproduce sound, and a dome-shaped main diaphragm
eccentric to a center of the voice coil, and a dome It is characterized in that it is provided
extending radially outward from the outer peripheral edge portion of the mold main diaphragm,
and an outer peripheral portion sub diaphragm which reproduces the sound of the region that
supplements the dome type main diaphragm.
[0020]
Here, with the diaphragm which is eccentric to the center of the voice coil, the shape of the
diaphragm is a shape which is not coaxial with the voice coil, or a shape obtained by cutting a
right circular cone in an oblique plane which is not orthogonal to the axis It refers to a so-called
eccentric diaphragm, which includes all diaphragms whose central axes are offset with respect to
the center of the circle or ellipse formed by the outer peripheral edge of the diaphragm.
[0021]
Hereinafter, embodiments of the speaker device according to the present invention will be
described in detail.
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The present invention is not limited by the embodiment.
In the following, the outline and features of the speaker device of the present invention will be
described as an embodiment, and then an example of the speaker device will be described.
[0022]
The present invention relates to a speaker device in which a center cap or a sub cone is provided
as a diaphragm having a shape different from that of the main diaphragm in addition to the main
diaphragm, thereby achieving a wide band of reproduced sound. In order to improve
characteristic deterioration due to resonance, at least one of the plurality of diaphragms is
decentered.
[0023]
First Embodiment The speaker device according to the first embodiment is a speaker device
having a main diaphragm, a sub diaphragm, and a center cap as diaphragms, all of which are
eccentric.
That is, the speaker device according to the first embodiment is provided with a main diaphragm
that reproduces sound by transmitting vibration from a voice coil driven by a magnetic circuit,
and extending in the sound radiation direction from the central portion of the main diaphragm.
And a sub-diaphragm that reproduces the sound of the area that supplements the main
diaphragm, and a hole provided at the center of the sub-diaphragm so as to close the hole of the
sub-diaphragm. And a center cap.
Then, the auxiliary diaphragm and the center cap are eccentric with respect to the center of the
voice coil.
In addition, the main diaphragm is also decentered.
Therefore, deterioration of the characteristics due to the split resonance can be improved.
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Even in the speaker device in which the main diaphragm is not eccentric, a predetermined effect
can be obtained as long as one of the sub diaphragm and the center cap is eccentric.
[0024]
Further, in the speaker device of the first embodiment, the main diaphragm, the sub diaphragm,
and the center cap are decentered so that the directivity is inclined in the same direction.
Therefore, the pointing direction of the speaker device can be largely inclined. As a result, as in
the case of installing the speaker device in the cabin of the vehicle, for example, when it is
desired to radiate the sound in a direction inclined with respect to the mounting surface of the
speaker device, the sound is transmitted in a sharp direction with respect to the mounting
surface It can be emitted. On the other hand, the directivity can be made smaller by making the
directions of the eccentricities be opposite to each other. Furthermore, it is possible to eliminate
the inclination of directivity by mutually adjusting the amount of eccentricity. Furthermore, by
adjusting the vectors (the direction and the magnitude of the eccentricity) of the mutual
eccentricity, it is possible to turn the pointing direction in any direction. That is, the pointing
direction can be freely controlled.
[0025]
Furthermore, in the speaker device according to the first embodiment, the auxiliary diaphragm
and the center cap are integrally formed. Therefore, the timbre of the sound to be reproduced is
unified, and together with the improvement of the deterioration of the characteristics due to the
split resonance, the sense of reality can be improved.
[0026]
Second Embodiment A speaker device according to a second embodiment is a speaker device
having a main diaphragm and an auxiliary diaphragm. That is, the speaker device according to
the second embodiment is provided with a main diaphragm that receives vibrations transmitted
from a voice coil driven by a magnetic circuit to reproduce sound, and extends in the sound
radiation direction from the central portion of the main diaphragm. And an auxiliary diaphragm
that reproduces the sound of the area that supplements the main diaphragm. And the sub
diaphragm is eccentric with respect to the center of a voice coil. Therefore, deterioration of the
characteristics due to the split resonance can be improved. In addition to this configuration, if the
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main diaphragm is further decentered, the pointing direction of the speaker device can be further
greatly inclined.
[0027]
Third Embodiment The speaker device according to the third embodiment includes a main
diaphragm that receives sound from vibration transmitted from a voice coil driven by a magnetic
circuit, and closes a hole in a central portion of the main diaphragm. And a center cap that
reproduces the sound of the area that supplements the main diaphragm. The center cap is
eccentric with respect to the center of the voice coil, and the main diaphragm is also eccentric.
Therefore, deterioration of the characteristics due to the split resonance can be improved. Even
when only one of the center cap and the main diaphragm is eccentric, a predetermined effect can
be obtained.
[0028]
Further, in the speaker device of the third embodiment, the main diaphragm and the center cap
are decentered such that the directivity is inclined in the same direction. Therefore, although not
as much as Embodiment 1, since the pointing direction of the speaker device can be largely
inclined, it is effective when it is desired to emit the sound in the direction inclined to the
mounting surface in the passenger compartment of the vehicle. In addition, the directionality of
the eccentricity is made to be opposite to each other so that the directivity is inclined in the
opposite direction, and the inclination of the directivity is reduced or eliminated altogether, or
the vectors of the mutual eccentricity are adjusted to freely control the directivity direction. The
same as in the first embodiment.
[0029]
Further, in the speaker device according to the third embodiment, the main diaphragm and the
center cap are integrally formed, so that the timbre of the sound to be reproduced is unified,
which is combined with the improvement of the characteristic deterioration due to the split
resonance. The sense of reality can be improved. This is the same as the effect obtained by
integrally molding the main diaphragm and the center cap in the first embodiment.
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[0030]
Fourth Embodiment The loudspeaker device of the fourth embodiment includes a dome-shaped
main diaphragm that transmits vibration from a voice coil driven by a magnetic circuit to
reproduce sound, and an outer peripheral edge portion of the dome-shaped main diaphragm. And
a sub-diaphragm that is provided to extend radially outward and reproduces the sound of the
area that supplements the dome-shaped main diaphragm. Then, the main diaphragm is eccentric
to the center of the voice coil, and the sub diaphragm is also eccentric. Therefore, deterioration of
the characteristics due to the split resonance can be improved. Even when only one of the
auxiliary diaphragm and the main diaphragm is eccentric, a predetermined effect can be
obtained. It is possible to reduce the inclination of the directivity by making the directions of the
eccentricity be opposite to each other so as to reduce the inclination of the directivity, or to
control the directivity direction freely by adjusting the vectors of the mutual eccentricity. The
same as in the first and third embodiments. Hereinafter, preferred embodiments of the present
invention will be described with reference to the drawings.
[0031]
Example 1 FIG. 3 is a cross-sectional view of a cone-shaped speaker device having an eccentric
sub-cone according to Example 1 and an integrally formed eccentric sub-cone and a center cap
provided in the speaker device. In FIG. 3, a cone-type speaker device 31 according to this
embodiment includes a main diaphragm (hereinafter, main cone) 1A, an eccentric sub diaphragm
(hereinafter, sub cone) 3B, a center cap 2A, a voice coil bobbin 17 and a voice coil 15. And a
magnetic circuit 20 comprising a yoke 13, a magnet 11 and a top plate 12.
[0032]
A top plate 12 and a yoke 13 made of a magnetic material such as iron are attached to the front
and back sides of the ring-shaped magnet 11. A center pole 14 integrated with the yoke 13 is
disposed in the center of the front surface of the yoke 13. A magnetic gap g is formed between
the outer peripheral surface of the center pole 14 and the inner peripheral surface of the top
plate 12. That is, the magnet 11, the top plate 12, the yoke 13 and the center pole 14 constitute
a magnetic circuit 20 forming a magnetic gap g between the outer peripheral surface of the
center pole 14 and the inner peripheral surface of the top plate 12. A frame 16 is attached to the
front of the top plate 12.
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[0033]
Furthermore, on the opposite side to the magnet 11 which is the front of the top plate 12, a
substantially trumpet-shaped main cone 1A is disposed with the large diameter portion facing
forward. A substantially trumpet-shaped sub cone 3B is disposed with the large diameter portion
facing forward so as to extend in the forward direction from the central hole of the main cone
1A. The central axis of the main cone 1A coincides with the central axis O of the magnetic circuit
20 and the voice coil 15. The sub cone 3B has a conical small diameter portion connected to the
small diameter portion of the main cone 1A, and the opposite large diameter portion extends to
the middle portion of the main cone 1A. The sub cone 3B vibrates together with the main cone
1A, and reproduces high-range sound that can not be reproduced by the main cone 1A. The
central axis of the sub cone 3B is offset from the central axis O of the magnetic circuit 20 and the
voice coil 15 by a distance F.
[0034]
A small diameter dome-shaped center cap 2A is provided to close the hole in the central portion
of the sub cone 3B. The sub-cone 3B and the center cap 2A are integrally molded and made of
either the same material as paper or fiber. The central axis of the center cap 2A coincides with
the central axis O. The center cap 2A vibrates together with the main cone 1A in the same
manner as the sub cone 3B, and reproduces a higher-band sound that can not be reproduced by
the main cone 1A or the sub cone 3B. The center cap 2A also contributes to dustproofing of the
inside of the speaker device 31 and improvement of the rigidity of the central portion of the
main cone 1A.
[0035]
Furthermore, a cylindrical voice coil bobbin 17 is disposed with its central axis aligned with the
main cone 1A and the center cap 2A. The voice coil bobbin 17 is supported from the frame 16 by
an elastic spider 18 so as to be movable back and forth along the central axis. A center cap 2A
molded integrally with the sub-cone 3B is connected to and supported by the voice coil bobbin
17 at the peripheral edge portion. The main cone 1A is supported by fixing the circular
peripheral edge of the conical large diameter portion to the outer peripheral edge of the frame
16 and connecting the conical small diameter portion to the sub cone 3B.
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[0036]
The voice coil 15 is wound around the outer peripheral surface of the voice coil bobbin 17. The
voice coil bobbin 17 is disposed such that the voice coil 15 is positioned at a predetermined
position in the gap g.
[0037]
In the speaker device 31 having such a configuration, since the sub cone 3B is decentered from
the central axis O of the magnetic circuit 20 and the voice coil 15 by the distance F, the
resonance frequencies of the main cone 1A and the sub cone 3B are mutually shifted. It is
possible to improve the deterioration of the characteristics due to the split resonance. Further,
since the sub cone 3B and the center cap 2A are integrally formed, the timbre of the sound to be
reproduced is unified, and the presence can be improved together with the improvement of the
deterioration of the characteristics due to the split resonance.
[0038]
Second Embodiment FIG. 4 is a cross-sectional view of a cone-shaped speaker device having an
eccentric center cap according to a second embodiment and an integrally formed sub-cone and
an eccentric center cap provided in the speaker device. In FIG. 4, in the cone-type speaker device
32 of the present embodiment, the central axis of the sub cone 3A coincides with the central axis
O of the magnetic circuit 20 and the voice coil 15. The central axis of the center cap 2B is
eccentric to the central axis O by a distance D. Both are integrally molded of the same material
and manufactured.
[0039]
In the present embodiment, since the center cap 2B is offset from the central axis O of the
magnetic circuit 20 and the voice coil 15 by the distance D, the resonance frequencies of the
main cone 1A and the center cap 2B can be mutually offset. And degradation of characteristics
due to split resonance can be improved. Further, since the sub cone 3A and the center cap 2B are
integrally formed, the timbre of the sound to be reproduced is unified, and it is possible to
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improve the presence together with the improvement of the deterioration of the characteristics
due to the split resonance.
[0040]
In addition, although the shape of the center cap 2B of a present Example is a convex shape with
respect to the radiation ¦ emission direction of an acoustic, even if it is a concave shape with
respect to the radiation ¦ emission direction of an acoustic, the same effect may be acquired. Can.
[0041]
(Third Embodiment) FIG. 5 is a cross-sectional view of a cone type speaker device having an
eccentric sub cone and an eccentric center cap according to a third embodiment, and an
integrally formed eccentric sub cone and an eccentric center cap provided in the speaker device. .
In FIG. 5, in the cone-type speaker device 33 of the present embodiment, the central axis of the
sub cone 3B is eccentric to the central axis O by the distance F. The central axis of the center cap
2B is eccentric to the central axis O by a distance D. The sub cone 3B and the center cap 2B are
integrally formed of the same material and manufactured. In the speaker device 33 of the present
embodiment, since the sub cone 3B and the center cap 2B are eccentric, it is possible to further
improve the deterioration of the characteristics due to the split resonance.
[0042]
Fourth Embodiment FIG. 6 is a cross-sectional view of a cone-type speaker device having an
eccentric sub-cone according to a fourth embodiment. In FIG. 6, in the cone type speaker device
34 of the present embodiment, the central axis of the main cone 1A coincides with the central
axis O of the magnetic circuit 20 and the voice coil 15. The central axis of the sub cone 3B is
eccentric to the central axis O by a distance F. There is no center cap.
[0043]
In this embodiment, since the sub-cone 3B is offset from the central axis O of the magnetic circuit
20 and the voice coil 15 by the distance F, the resonance frequencies of the main cone 1A and
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the sub-cone 3B can be mutually offset. It is possible to improve the deterioration of the
characteristics due to resonance.
[0044]
(Example 5) FIG. 7 is a cross-sectional view of a speaker apparatus having an eccentric main cone
of Example 5, and an integrally formed eccentric sub-cone and a center cap provided in the
speaker apparatus.
In FIG. 7, in the cone-type speaker device 35 of the present embodiment, the central axis of the
main cone 1 B is eccentric to the central axis O of the magnetic circuit 20 and the voice coil 15
by the distance E. The central axis of the sub cone 3B is eccentric to the central axis O by a
distance F. The central axis of the center cap 2A coincides with the central axis O. The sub cone
3B and the center cap 2A are integrally formed of the same material and manufactured. In the
speaker device 35 of this embodiment, since the main cone 1B and the sub cone 3B are eccentric,
it is possible to improve the deterioration of the characteristics due to the split resonance.
[0045]
Sixth Embodiment FIG. 8 is a cross-sectional view of a speaker apparatus having an eccentric
main cone according to a sixth embodiment, and an integrally formed eccentric sub-cone and an
eccentric center cap provided in the speaker apparatus.
[0046]
Seventh Embodiment FIG. 9 is a cross-sectional view of the bending cone type speaker device of
the seventh embodiment and an integrally formed eccentric sub-cone and a center cap provided
in the speaker device.
The main cones of the above-described Examples 1 to 6 were all roughly trumpet-shaped
diaphragms, but the main cones were shaped like a trumpet-shaped cone bent in the middle in
the radial direction as in this example. The same effect can be obtained even with
[0047]
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In FIG. 9, in the bending cone type speaker device 37 of the present embodiment, the central axis
of the main cone 4B is eccentric to the central axis O of the magnetic circuit 20 and the voice coil
15 by the distance E. The central axis of the sub cone 3B is eccentric to the central axis O by a
distance F. The sub cone 3B and the center cap 2A are integrally molded and manufactured.
[0048]
In the present embodiment, the main cone 4B and the sub cone 3B are decentered so that the
directivity is inclined in the same direction. With this configuration, substantially the same effect
as that of the fifth embodiment can be obtained.
[0049]
Eighth Embodiment FIG. 10 is a cross-sectional view of the bending cone type speaker device of
the eighth embodiment and an integrally formed eccentric sub-cone and an eccentric center cap
provided in the speaker device. In FIG. 10, in the bending cone type speaker device 38 of the
present embodiment, the central axis of the main cone 4B is eccentric to the central axis O of the
magnetic circuit 20 and the voice coil 15 by the distance E. The central axis of the sub cone 3B is
eccentric to the central axis O by a distance F. The central axis of the center cap 2B is eccentric to
the central axis O by a distance D. The sub cone 3B and the center cap 2B are integrally molded
and manufactured.
[0050]
Furthermore, in the speaker device 38 of the present embodiment, the directivity of the main
cone 4B, the sub cone 3B and the center cap 2B is eccentrically inclined in the same direction, so
that the pointing direction of the speaker device 38 can be greatly inclined. it can. The inclination
of directivity can be reduced by making the directions of eccentricity of the main cone 4B, the
sub cone 3B, and the center cap 2B different from each other, contrary to that of the present
embodiment. In addition, the inclination can be eliminated by adjusting the mutual eccentricity.
Furthermore, the directivity direction can be directed in any direction by adjusting the mutual
eccentricity vectors of the main cone 4B, the sub cone 3B and the center cap 2B. That is, the
pointing direction can be freely controlled.
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15
[0051]
Ninth Embodiment FIG. 11 is a cross-sectional view of the cone-shaped speaker device of the
ninth embodiment and an integrally molded main cone and an eccentric center cap provided in
the speaker device. In FIG. 11, in the cone type speaker device 39 of the present embodiment, the
central axis of the main cone 1A coincides with the central axis O of the magnetic circuit 20 and
the voice coil 15. The central axis of the center cap 2B is eccentric to the central axis O by a
distance D. Both are integrally molded of the same material and manufactured.
[0052]
In the speaker device 39 having such a configuration, since the center cap 2B is decentered from
the central axis O of the magnetic circuit 20 and the voice coil 15 by the distance D, the
resonance frequency of the main cone 1A and the center cap 2B is It is possible to improve the
deterioration of the characteristics due to split resonance. Further, since the main cone 1A and
the center cap 2B are integrally formed, the timbre of the sound to be reproduced is unified, and
it is possible to improve the sense of realism combined with the improvement of the
deterioration of the characteristics due to the split resonance.
[0053]
In addition, although the shape of the center cap 2B of a present Example is a convex shape with
respect to the radiation ¦ emission direction of an acoustic, even if it is a concave shape with
respect to the radiation ¦ emission direction of an acoustic, the same effect may be acquired. Can.
[0054]
Tenth Embodiment FIG. 12 is a cross-sectional view of a speaker apparatus having an eccentric
main cone according to a tenth embodiment and an integrally formed eccentric main cone and an
eccentric center cap provided in the speaker apparatus.
In FIG. 12, in the cone-type speaker device 40 of the present embodiment, the central axis of the
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main cone 1B is eccentric to the central axis O of the magnetic circuit 20 and the voice coil 15 by
the distance E. The central axis of the center cap 2B is eccentric to the central axis O by a
distance D. Both are integrally molded of the same material and manufactured.
[0055]
In the present embodiment, the main cone 1B and the center cap 2B are eccentric so that the
directivity is inclined in the same direction. With this configuration, the pointing direction of the
speaker device 40 can be greatly inclined. In addition, the inclination of directivity can be made
small by making directivity the directions of eccentricity of main cone 1B and center cap 2B
opposite to each other contrary to the one of this embodiment. Moreover, inclination can also be
eliminated by mutually adjusting. Furthermore, the pointing direction can be directed in any
direction by adjusting the vector of mutual eccentricity of the main cone 1B and the center cap
2B. That is, the pointing direction can be freely controlled.
[0056]
(Example 11) FIG. 13 is a cross-sectional view of the bending cone type speaker device of
Example 11 and an integrally formed eccentric main cone and a center cap which are provided in
the speaker device. In FIG. 13, in the bending cone type speaker device 41 of the present
embodiment, the central axis of the bending main cone 4B is eccentric to the central axis O of the
magnetic circuit 20 and the voice coil 15 by the distance E. The central axis of the center cap 2A
coincides with the central axis O. Both are integrally molded and produced.
[0057]
In the present embodiment, since the main cone 4B and the center cap 2A integrally molded with
the main cone 4B are provided, the resonance frequencies of the main cone 4B and the center
cap 2A can be mutually shifted, and split resonance It is possible to improve the deterioration of
the characteristics due to Further, since the main cone 4B and the center cap 2A are integrally
formed, the timbre of the sound to be reproduced is unified, and it is possible to improve the
sense of realism combined with the improvement of the deterioration of the characteristics due
to the split resonance.
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[0058]
(Example 12) FIG. 14 is a cross-sectional view of the bending cone type speaker device of
Example 12, and an integrally formed eccentric main cone and an eccentric center cap which are
equipped in the speaker device. In FIG. 14, in the bending cone type speaker device 42 of the
present embodiment, the central axis of the bending main cone 4B is eccentric to the central axis
O of the magnetic circuit 20 and the voice coil 15 by the distance E. The central axis of the center
cap 2B is eccentric to the central axis O by a distance D. Both are integrally molded and
produced.
[0059]
In the present embodiment, the main cone 4B and the center cap 2B are eccentric so that the
directivity is inclined in the same direction. With this configuration, substantially the same effect
as that of the tenth embodiment can be obtained. That is, the pointing direction of the speaker
device 42 can be largely inclined. As in the tenth embodiment, the directivity of the main cone 4B
and the center cap 2B is inclined in the opposite direction to each other in the opposite direction
to that of the present embodiment, so that the directivity is inclined. Can be made smaller. In
addition, the inclination can be eliminated by the adjustment. Furthermore, the pointing direction
can be directed in any direction by adjusting the vector of the eccentricity between the main cone
4B and the center cap 2B. That is, the pointing direction can be freely controlled.
[0060]
Example 13 FIG. 15 is a cross-sectional view of the semi-dome type speaker device of Example
13 and an integrally formed diaphragm provided in the speaker device. In FIG. 15, the semi-dome
type speaker device 43 includes a dome-shaped main diaphragm 7B which is a dome-shaped
main diaphragm, an outer peripheral auxiliary diaphragm 8A which is a cone-shaped auxiliary
diaphragm, a voice coil bobbin 17 and a voice coil 15. And a magnetic circuit 20 comprising a
pot yoke 13, a magnet 11 and a top plate 12.
[0061]
The dome-shaped main diaphragm 7B has a substantially semi-spherical shape (so-called semi-
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dome shape) having an opening on the speaker device side (the side opposite to the sound
radiation direction). The dome-shaped main diaphragm 7 B is eccentric to the central axis O of
the magnetic circuit 20 and the voice coil 15 by a distance G. The outer peripheral auxiliary
diaphragm 8A has a flat ring truncated cone shape and is provided so as to extend radially
outward from the outer peripheral edge of the dome-shaped main diaphragm 7B. The domeshaped main diaphragm 7B and the outer peripheral auxiliary diaphragm 8A are integrally
formed of the same material. The outer peripheral edge portion of the outer peripheral auxiliary
diaphragm 8A is fixed to the outer peripheral edge portion of the substantially hat-shaped resin
plate 19 constituting the housing over the entire periphery. The dome-shaped main diaphragm 7
</ b> B is fixed so as to sandwich the upper portion of the side outer wall of the voice coil bobbin
17.
[0062]
The voice coil bobbin 17 has a substantially cylindrical shape having an opening on the lower
surface, and the voice coil 15 is wound around the outer wall thereof. The outer wall of the voice
coil bobbin 17 is opposed to the inner wall of the side surface of the substantially cylindrical
crucible yoke 13 having an opening on the upper surface, with a predetermined gap. On the
other hand, the side inner wall of the voice coil bobbin 17 is opposed to the side outer wall of the
disk-like magnet 11 and the side outer wall of the disk-like top plate 12 having a diameter
slightly larger than the magnet 11 via a fixed distance. There is. A magnetic gap g is formed
between the side outer wall of the top plate 12 and the side inner wall of the pot yoke 13.
[0063]
In the semi-dome type speaker device 43 configured as described above, when the voice current
flows in the voice coil 15 in a uniform magnetic field, the voice coil bobbin 17 moves up and
down in the axial direction of the speaker by the principle of electromagnetic action. Vibrate.
Then, the vibration is transmitted to the dome-shaped main diaphragm 7B and the outer
peripheral sub-diaphragm 8A, and sound is emitted from the dome-shaped main diaphragm 7B
and the outer peripheral sub-diaphragm 8A.
[0064]
Then, a dome-shaped main diaphragm 7B and an outer peripheral portion auxiliary diaphragm
8A which are integrally formed of the same material are provided with respect to the center of
the voice coil 15, and further, the dome-shaped main diaphragm 7B has a distance G Because of
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the eccentricity alone, it is possible to achieve a wide band and improve the frequency
characteristics, and further unify the timbre of the sound to be reproduced, so it is possible to
further improve the sense of realism.
[0065]
Example 14 FIG. 16 is a cross-sectional view of the semi-dome type speaker device of Example
14 and an integrally-formed diaphragm provided in the speaker device.
In FIG. 16, in the semi-dome type speaker device 44 of this embodiment, the central axis of the
dome-shaped main diaphragm 7A which is a dome-shaped main diaphragm coincides with the
central axis O of the magnetic circuit 20 and the voice coil 15. . On the other hand, the central
axis of the outer peripheral auxiliary diaphragm 8A, which is the auxiliary diaphragm, is
eccentric to the central axis O by the distance H. The other configuration is the same as that of
the eleventh embodiment.
[0066]
Also in the semi-dome type speaker device 44 having such a configuration, since the outer
peripheral portion auxiliary diaphragm 8A is decentered, it is possible to improve the frequency
characteristics and to unify the tone of the reproduced sound.
[0067]
Example 15 FIG. 17 is a cross-sectional view of the semi-dome type speaker device of Example
15 and an integrally-formed diaphragm provided in the speaker device.
In FIG. 17, in the semi-dome type speaker device 45 of the present embodiment, the central axis
of the dome-shaped main diaphragm 7B is eccentric to the central axis O of the magnetic circuit
20 and the voice coil 15 by the distance G. The central axis of the outer peripheral auxiliary
diaphragm 8B is offset from the central axis O by the distance H.
[0068]
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In the present embodiment, the dome-shaped main diaphragm 7B and the outer peripheral
auxiliary diaphragm 8B are decentered so that the directivity is inclined in opposite directions. By
this configuration, the inclination of the directivity of the speaker device 45 can be made small.
Further adjustment can completely eliminate the inclination. The inclination of directivity can be
increased by inclining the directions of eccentricity of the dome-shaped main diaphragm 7B and
the outer peripheral portion auxiliary diaphragm 8B in the same direction, contrary to that of the
present embodiment. You can also. Further, from this point of view, it is possible to direct the
pointing direction to an arbitrary direction by adjusting the vector of mutual eccentricity of the
dome-shaped main diaphragm 7B and the outer peripheral portion auxiliary diaphragm 8B. That
is, the pointing direction can be freely controlled.
[0069]
The present invention is suitably applied to a speaker device for achieving a wide band by
providing a center cap and a sub cone, and is particularly suitably applied to an on-vehicle
speaker device installed in a passenger compartment of a vehicle.
[0070]
It is a cross-sectional view which shows the internal structure of the conventional speaker
apparatus.
It is a cross-sectional view of the conventional semi dome type speaker apparatus. FIG. 1 is a
cross-sectional view of a cone-shaped speaker device having an eccentric sub-cone of Example 1
and an integrally formed eccentric sub-cone and a center cap provided in the speaker device. It is
a cross-sectional view of the cone type speaker apparatus which has an eccentric center cap of
Example 2, and the integrally formed sub cone equipped with this speaker apparatus, and an
eccentric center cap. It is a cross-sectional view of the cone type speaker apparatus which has an
eccentric sub cone of Example 3, and an eccentric center cap, the eccentric sub cone by which it
is equipped with this speaker apparatus integrally, and an eccentric center cap. FIG. 10 is a crosssectional view of a cone-shaped speaker device having an eccentric sub-cone according to a
fourth embodiment. It is a cross-sectional view of the speaker apparatus which has an eccentric
main cone of Example 5, and the integrally-shaped eccentric sub cone and center cap which are
equipped with this speaker apparatus. It is a cross-sectional view of the speaker apparatus which
has an eccentric main cone of Example 6, and the integrally-shaped eccentric sub cone and
eccentric center cap which are equipped with this speaker apparatus. It is a cross-sectional view
of the bending cone type speaker apparatus of Example 7, and an integrally formed eccentric sub
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cone and a center cap which are equipped in this speaker apparatus. FIG. 24 is a cross-sectional
view of a bending cone type speaker device of Example 8 and an integrally formed eccentric subcone and an eccentric center cap provided in the speaker device. FIG. 24 is a cross-sectional view
of the cone-shaped speaker device of Example 9 and an integrally molded main cone and an
eccentric center cap which are provided in the speaker device. FIG. 21 is a cross-sectional view of
a speaker apparatus having an eccentric main cone of Example 10, an integrally formed eccentric
main cone and an eccentric center cap provided in the speaker apparatus. FIG. 24 is a crosssectional view of the bending cone type speaker device of Example 11 and an integrally formed
eccentric main cone and a center cap provided in the speaker device. FIG. 24 is a cross-sectional
view of the bending cone type speaker device of Example 12, and an integrally formed eccentric
main cone and an eccentric center cap which are provided in the speaker device. FIG. 31 is a
cross-sectional view of the semi-dome type speaker device of Example 13 and an integrally
formed diaphragm provided in the speaker device. FIG. 40 is a cross-sectional view of the semidome type speaker device of Example 14 and an integrally-formed diaphragm provided in the
speaker device. FIG. 21 is a cross-sectional view of the semi-dome type speaker device of
Example 15 and an integrally formed diaphragm provided in the speaker device.
Explanation of sign
[0071]
1A Eccentric main cone (main diaphragm) 1B Eccentric main cone (main diaphragm) 2A
Eccentric center cap 2B Eccentric center cap 3A Eccentric sub cone (sub diaphragm) 3B Eccentric
sub cone (sub diaphragm (sub diaphragm) ) 4B Eccentric bending type main cone (main
diaphragm) 7A Non-eccentric dome type main diaphragm 7B Eccentric dome type main
diaphragm 8A Non-eccentric outer peripheral sub diaphragm 8B Eccentric peripheral sub
diaphragm 11 Magnet 12 top top plate 13 yoke 14 center pole 15 voice coil 16 frame 17 voice
coil bobbin 18 spider O magnetic circuit and central axis of voice coil g magnetic gap
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