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JP2004015565

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DESCRIPTION JP2004015565
An object of the present invention is to suppress vibration with a small number of parts and to
improve reproduction sound quality. A magnetic circuit (6, 7) of a pair of speaker units (2, 3) is
opposed to each other and connected by a bonding material (10). The vibrations generated from
the speaker units 2 and 3 cancel each other, unnecessary vibrations are suppressed, and
transient characteristics can be improved. Acoustic loads 8 and 9 can be provided in front of
each frame 6 and 7 to reduce the resonance frequency to widen the bass reproduction band.
[Selected figure] Figure 1
Speaker device
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device capable of reproducing sound with good sound quality. Conventionally, in a
speaker device, a diaphragm is electrically driven by a speaker unit having a diaphragm, and
converted to an acoustic output by the diaphragm. In the speaker unit, sound output is generated
from diaphragms of various shapes such as a cone, a flat plate, and a dome. In order to generate
a driving force for driving the diaphragm, an electrodynamic drive unit using a magnetic circuit
with a permanent magnet as a magnetic flux source is used. The magnetic circuit concentrates
the magnetic flux in a space called a magnetic air gap, and generates an electromagnetic driving
force on the voice coil in the magnetic air gap. In the speaker unit, the frame holds the magnetic
circuit and supports the diaphragm so as to be displaceable in the driving direction of the voice
coil. Usually, the surface of the diaphragm on which the magnetic circuit is not disposed is the
acoustic radiation surface, and displacement of the surface of the diaphragm causes a change in
air density, which makes it possible to extract an acoustic output into space. The displacement of
the surface of the diaphragm causes the back side to generate an acoustic output that is opposite
in phase to the surface side. When the sound output on the sound emitting surface side and the
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sound output from the back are mixed, the phases are reversed, so that they cancel each other
and the sound output is reduced. Such an effect is noticeable in the low range. In the speaker
device, the speaker unit is configured such that the acoustic output from the back side of the
acoustic emission surface does not wrap around to the acoustic emission surface in order to
efficiently obtain the acoustic output from the acoustic emission surface of the diaphragm of the
speaker unit. Is often housed in an enclosure such as a cabinet or speaker box, and only the
acoustic emission surface of the diaphragm is often exposed on the surface of the enclosure. In
the speaker unit, the reaction reaction of the movement of the diaphragm for generating sound is
transmitted to the frame side, and the frame, the magnetic circuit, etc. are easily vibrated. Since
the energy for moving the diaphragm leaks to a support system such as a frame, the energy
transmitted from the diaphragm to the air to be an acoustic output is reduced, and the energy
transfer efficiency is reduced. With the energy leaking to the support system, each portion
constituting the speaker unit, the enclosure and the like may also perform their own unique
vibrations, and they are induced by the drive to the diaphragm to cause vibrations. Such
vibration continues even when driving to the diaphragm is stopped, so it is mixed with the sound
output to be originally reproduced as a residual sound, worsens the transient characteristics of
the reproduced sound, and impairs the sense of speed of the reproduced sound. It will lower the
sound quality.
In order to improve the sense of speed of the playback sound, using a small aperture speaker
with a small aperture of the diaphragm is advantageous because the weight of the vibration
system is reduced and the transient characteristics are improved, but it is merely a small
aperture In such a case, the mass of air loaded on the surface of the diaphragm also becomes
small, and there is a disadvantage that the minimum resonance frequency becomes high. In order
to improve the sound quality of the reproduction sound by the speaker device, it is necessary to
suppress unnecessary vibration of each part. In general, if the mass of the frame or magnetic
circuit of the speaker unit is increased, and the mass of the enclosure is also increased, vibration
becomes difficult. In Japanese Utility Model Application Laid-Open No. 6-66194, in order to
reduce the vibration and resonance while reducing the weight of the speaker system, the axes of
the plurality of speaker units are horizontal in the horizontal plane with respect to the movement
direction of the vibration system. Are arranged in a balanced direction, and arranged such that
the axes have equal elevations with respect to the horizontal plane in the vertical plane, and the
support systems of the speaker unit are coupled by the axially rigid coupling member Prior art is
disclosed. In this prior art, when the number of speaker units having a magnetic circuit on the
back of the diaphragm is two, the magnetic circuit sides are opposed to each other in the
horizontal plane, but they are inclined at a constant elevation angle with respect to the horizontal
plane. The axial directions of the two speaker units are not located on the same straight line, but
the sound reproduction is performed in a mutually inclined state. For this reason, the coupling
member is also joined to the inner wall surface of the cabinet on the axial extension of each
speaker unit. Further, according to Registered Utility Model Publication No. 3008172, a wall-
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hanging speaker in which a fixing tool attached to the back side of the speaker unit is extended
in the cabinet to protrude outside the cabinet and fix the cabinet to a wall surface. Prior art is
disclosed. Since the speaker unit is fixed to the wall surface via the fixing tool, it is expected that
the vibration can be suppressed low. In JP 2001-78285 A, a speaker unit is attached to an eggshaped enclosure, and a rod-like member fixed to the center of gravity of a magnetic circuit on
the back of the speaker unit is extended to the back side. Prior art has been disclosed which
provides sufficient support and holds static equilibrium with a weight to suppress unwanted
vibrations. SUMMARY OF THE INVENTION The prior art as disclosed in Japanese Utility Model
Registration No. 3008172 and Japanese Patent Application Laid-Open No. 2001-78285 provide
support for the speaker unit also from the outside of the enclosure. Become.
Therefore, the installation place of the speaker device is limited, and it may take time for
installation. Even in the prior art as disclosed in Japanese Utility Model Application Laid-Open
No. 6-66194, since the speaker units are connected with each other by the connecting members
and also joined to the cabinet, it may take time to mount the connecting members. In a speaker
device, a structure in which a speaker unit is screwed to the front of an enclosure such as a
speaker box or a cabinet is the mainstream. In the case of this structure, the vibration generated
in the speaker unit is easily transmitted to the enclosure, and the out-of-phase sound is generated
from the surface of the enclosure, which is one of the causes of muddy reproduction sound. If
mechanical support of the speaker unit is enhanced as in the above-described prior arts, although
it is expected to suppress the vibration generated in the speaker unit, the installation time will
increase. Furthermore, the number of parts for mechanical support also increases, and the cost
also increases. An object of the present invention is to provide a speaker device which can
suppress vibration with a small number of parts and can improve reproduction sound quality.
According to the present invention, a pair of speaker units and a pair of speaker units are
arranged such that drive portions for electrically driving a diaphragm face each other, and drive
axes are the same. A coupling material that mechanically connects the driving parts to each other
so as to maintain the arrangement state on the line, and each speaker unit is disposed on the
other surface side of the diaphragm, and an acoustic load is applied to the diaphragm. It is a
speaker apparatus characterized by including a pair of acoustic loads which lead out and an
acoustic output is derived. According to the present invention, the pair of speaker units are made
to face each other by means of the bonding material such that the drive portions for electrically
driving the diaphragms face each other, and the drive axes are arranged in the same straight line.
Since the driving parts are mechanically connected to each other, vibrations generated in the
support system of the speaker unit cancel each other. For each of the speaker units, on the side
of the diaphragm where the drive unit is not provided, an acoustic load that causes an acoustic
load to be applied to the diaphragm and causes an acoustic output to be derived is disposed.
Since the diaphragm is acoustically loaded by the acoustic load, it is possible to lower the
resonance frequency of the vibration system to enable bass reproduction even if transient
characteristics are improved using a small aperture diaphragm. it can. The low tone reproduction
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becomes possible, and the transient characteristic is also improved by the suppression of the
vibration, so that the reproduction sound quality can be enhanced.
The bonding material may be used to connect the drive parts of the speaker unit, so the number
of parts required to support the bonding material can be reduced, and the cost can be reduced.
Further, in the present invention, the pair of speaker units and the acoustic load are installed in
an adjacent space adjacent to a vehicle compartment in a vehicle body in a state where the drive
units of the speaker units are connected by the coupling material. Each acoustic load is
characterized in that it has an opening for introducing an acoustic output from a speaker unit
into the vehicle compartment. According to the present invention, for example, a space adjacent
to a passenger compartment, such as a trunk room of a passenger car, is made to function as an
enclosure, and a pair of speaker units are connected with each other by a coupling material. It
can be installed with the load provided. Since the opening for deriving the acoustic output from
the acoustic load into the vehicle compartment is provided, it is possible to take out the
reproduced sound with excellent transient characteristics into the vehicle compartment. The
bonding material does not need to be supported by the vehicle body, so that the speaker device
can be installed in the vehicle without requiring time and effort, and the number of parts can be
reduced to achieve cost reduction. Further, according to the present invention, the pair of
acoustic loads cover a space on the other surface side of the drive with respect to the diaphragm
of each speaker unit, and are predetermined in advance perpendicular to the direction of the axis
of the drive. The acoustic output from the diaphragm is derived in one direction. According to the
present invention, with respect to a space to be subjected to sound reproduction, a pair of
speaker units connected by a coupling material and a sound load are accommodated in a space
functioning as an enclosure or an enclosure, and an opening portion Only the playback sound
can be taken out with high sound quality. Further, in the present invention, the bonding material
is screwed to a drive portion of each speaker unit. According to the present invention, since the
driving parts of the pair of speaker units are connected with each other by the coupling material
screwed to each of the driving parts, coupling can be performed only with the coupling material,
and the number of parts and time and effort can be reduced. It can be reduced. Furthermore,
according to the present invention, the pair of speaker units and the pair of speaker units are
arranged such that the drive units for electrically driving the diaphragms face each other, and the
drive axes are positioned on the same straight line. As described above, the connector includes a
coupling material for mechanically connecting the driving parts, and a shock absorbing material
interposed in a portion for attaching the other surface side of the diaphragm to the enclosure for
each speaker unit. It is a speaker device characterized by being screwed in a drive part,
respectively.
According to the present invention, the pair of speaker units are made to face each other by
means of the bonding material so that the driving portions for electrically driving the diaphragms
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face each other, so that the axial lines of the driving can be maintained on the same straight line.
Since the driving parts are mechanically connected to each other, vibrations generated in the
support system of the speaker unit cancel each other. Each speaker unit is attached to the
enclosure via a shock absorbing material, so that transmission of vibration to the enclosure can
be suppressed. Since the vibration of the speaker unit and the enclosure is suppressed, transient
characteristics can be improved and the reproduction sound quality can be enhanced. The
coupling material connects the drive parts of the speaker unit by screwing, so that the number of
parts can be reduced and the cost can be reduced. Further, according to the present invention,
both ends of the bonding material and the driving portion of each speaker unit are both ends of
the bonding material by rotating the bonding material in a predetermined direction with respect
to the direction of the axis line of driving of the speaker unit. The screw portion is formed in such
a direction that fastening with the drive portion of the speaker unit is simultaneously performed.
According to the present invention, when the bonding material is rotated in one predetermined
direction, it can be simultaneously screwed to the drive portion of the pair of speaker units, so
that the time required for connecting the speaker units can be saved. it can. Further, in the
present invention, the front shape of the diaphragm of the speaker unit is a laterally long shape.
According to the present invention, since the front surface shape of the diaphragm of the speaker
unit is oblong or oblong, etc., the speaker unit is disposed so that the front shape of the
diaphragm becomes horizontally long in the trunk room of the vehicle, etc. Thus, the speaker
device can be thinned so that the space such as the trunk room is not unnecessarily narrowed.
BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 shows a schematic configuration of a
speaker device 1 according to an embodiment of the present invention. In this embodiment, a
pair of electrodynamic speaker units 2 and 3 (the same type) are used. Each of the speaker units
2 and 3 supports the diaphragm and the magnetic circuits 6 and 7 by the frames 4 and 5,
respectively. The diaphragm has a cone shape made of paper, synthetic resin, metal or a
combination thereof, etc., and the peripheral portion is a part called an edge or the like so as to
be capable of reciprocating displacement in the axial direction. It is supported against. A bobbin
of a voice coil is joined to a central portion of the cone-shaped diaphragm, and a voice coil is
wound around a portion located in a magnetic gap formed in the magnetic circuits 6 and 7 by the
bobbin.
The bobbin 4 is supported by the frames 4 and 5 by parts called dampers. In the magnetic gap,
the magnetic flux generated from the permanent magnet is focused at a high density, and when a
current is supplied to the voice coil, a driving force for the diaphragm is generated by an
electromagnetic interaction. The displacement of the diaphragm causes a rough density with
respect to air, and sound waves accompanying mechanical displacement can be generated to
convert the power for driving the voice coil into an acoustic output. On the front side where the
acoustic output is emitted from each of the frames 4 and 5, acoustic loads 8 and 9 serving as
loads on the diaphragm are respectively disposed. The bonding material 10 is a drive unit so that
the magnetic circuits 6 and 7 of the pair of speaker units 2 and 3 are opposed to each other and
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the axial lines 2a and 3a for driving the diaphragm are positioned on the same straight line. The
magnetic circuits 6, 7 are mechanically connected. The speaker device 1 has the pair of speaker
units 2 and 3 in the enclosure 11, the magnetic circuits 6 and 7 on the back side facing each
other with the bonding material 10, and the acoustic loads 8 and 9 mounted on the front surface.
Store in the state. In order to extract an acoustic output out of the enclosure 11, openings 12 and
13 are provided in parts of the acoustic loads 8 and 9, respectively. The acoustic loads 8 and 9
form, for example, a space on the front side of the frames 4 and 5 of each speaker unit 2 and 3
so as to have a depth that does not hit even if the diaphragm is displaced forwardly projecting
The space is divided so as not to communicate with the outside except for the openings 12 and
13 on one side. When the pair of speaker units 2 and 3 are driven in parallel with the same
polarity, since the back surfaces are coupled, it is possible to cancel the generated vibration. FIGS.
2 and 3 show a state in which the speaker device 1 of FIG. 1 is mounted on a vehicle body 20 of
a passenger car. In order to perform audio reproduction, the passenger of the vehicle
compartment 21 uses the trunk room 22 as the enclosure 11 of FIG. 1 as a space adjacent to the
vehicle compartment 21, for example, and the speaker device 1 is installed. The openings 12 and
13 are provided in the upper pack 23 or the like above the trunk room 22. The installation of the
trunk room 22 of the speaker device 1 is performed by opening the door 24 of the trunk room
22 from the rear of the vehicle body 20. Since the pair of speakers 2 and 3, the acoustic loads 8
and 9, and the bonding material 10 may be combined in advance and integrated, and may be
attached as it is, the mounting operation as the speaker device 1 can be performed easily without
taking time and effort. Can. FIG. 4 shows a schematic configuration of a speaker device 31
according to another embodiment of the present invention.
In the present embodiment, parts corresponding to the embodiment of FIG. 1 are given the same
reference numerals, and redundant description will be omitted. FIG. 4 (a) shows a general
configuration, and FIG. 4 (b) shows a configuration capable of improving the workability. The
present embodiment is characterized in the structure in which the speaker units 2 and 3 are
connected to each other by the bonding material 10, and it goes without saying that the
embodiment is also applicable to the embodiment of FIG. In FIGS. 4A and 4B, when the frames 4
and 5 of the speaker units 2 and 3 are mounted on the surface of the enclosure 11, the buffer
members 32 and 33 are respectively interposed. The buffer materials 32 and 33 are formed of a
material such as felt, anti-vibration rubber, gel, etc. that has good anti-vibration properties based
on elasticity and damping. By interposing the buffer members 32 and 33, the vibration of the
speaker units 2 and 3 is less likely to be transmitted to the enclosure 11 such as a cabinet, and
the vibration of the enclosure 11 can be suppressed. Further, since the driving force generated
by the pair of speaker units 2 and 3 is in the opposite direction, the vibration can be canceled
and reduced. The bonding material 10 is formed of, for example, a nonmagnetic metal material
having a large specific gravity, such as stainless steel or brass. Generally, magnetic flux leaks
around the magnetic circuits 6 and 7. In particular, in the case of using an annular permanent
magnet called an external magnet type as the magnetic circuits 6 and 7, a strong magnetic force
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acts on the back side of the magnetic circuits 6 and 7. When a ferromagnetic material such as
iron is used as the material of the bonding material 10, the repulsion of the magnetic force is
increased and the bonding becomes difficult. In addition, since the magnetic flux is likely to leak
through the coupling material to be connected, the magnetic flux density in the magnetic gap of
the magnetic circuits 6 and 7 decreases, and the efficiency of sound reproduction as a speaker
decreases. In the configuration, the axial line 10a of the bonding material 10 is disposed to be
located on the same line as the driving shaft lines 2a and 3a of the speaker units 2 and 3, and
male screws 34 and 35 are provided at both axial ends of the bonding material 10. Form each.
With respect to the male screws 34, 35, female threads 36, 37 to be screwed with the male
screws 34, 35 are formed on the back center side of the magnetic circuits 6, 7, respectively. With
respect to the bonding material 10, any of the speaker units 2 and 3 can similarly be screwed
with the female screws 36 and 37 to the male screws 34 and 35 to integrate the whole. For
example, one of the speaker units 2 and 3 is attached to the enclosure 11 first, and the coupling
circuit 10 is screwed to the magnetic circuit of the other speaker unit. The speaker unit can be
attached to the enclosure 11 and screwed while the magnetic circuit is screwed to the bonding
material 10.
In the configuration of FIG. 4B, the speaker units 2 and 3 are connected by a bonding material 40
equivalent to the bonding material 10. In the bonding material 40, the directions of the external
threads 44 and 45 formed at both ends of the axis 40a are changed to match the external
threads 44 and 45 of the internal threads 46 and 47 formed in the magnetic circuits 6 and 7,
respectively. By this, when the bonding material 40 is rotated about the axis 40a, it is possible to
simultaneously tighten or loosen the screwing on both sides according to the rotation direction.
By using such a bonding material 40, it is possible to simultaneously connect the pair of speaker
units 2 and 3 and save time and effort. FIG. 5 shows an effect of connecting the pair of speaker
units 2 and 3 as a measurement result in the anechoic chamber as shown in FIG. In FIG. 5A,
output sound pressure characteristics and harmonics when driving the respective speaker units 2
and 3 in the same manner by mounting the speaker units 2 and 3 in the enclosure 11 with the
rear surfaces simply facing each other without connecting them It shows distortion
characteristics and electrical impedance characteristics. FIG. 5 (b) shows output sound pressure
characteristics, harmonic distortion characteristics and electrical impedance characteristics when
the speaker units 2 and 3 are connected and mounted on the enclosure 11 and the speaker units
2 and 3 are similarly driven. . By comparing the electrical impedance characteristics of FIGS. 5A
and 5B, it can be seen that the sharpness Q0 of the resonance as the speaker device is reduced
from 0.6 to 0.45. Such a drop in Q0 can improve vibration damping, improve transient
characteristics, and improve reproduction sound quality. In addition, when the second-order
distortion at a frequency of 100 Hz or less is compared, it can be seen that the distortion is
reduced by about 5 dB. The reduction of distortion can improve the reproduction sound quality.
FIG. 6 shows the effect of connecting the pair of speaker units 2 and 3 as shown in FIG. 4 in
comparison with Cumulative Spectrum data measured in an anechoic chamber. The accumulated
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spectrum data is obtained by analyzing an impulse response by a fast Fourier transform (FFT) or
the like, and shows the frequency characteristic of the acoustic output with respect to the
impulse input as a temporal change. When back coupling is not performed as shown in FIG. 6A,
for example, the vibration of 250 Hz continues up to 16 msec while being attenuated by 30 dB,
whereas when back coupling is performed as shown in FIG. It can be seen that it only lasts until
FIG. 7 shows the effect of using the acoustic loads 8 and 9 in the embodiment of FIG. 1 as
measurement results of output sound pressure characteristics, harmonic distortion
characteristics and electrical impedance characteristics in an anechoic chamber.
FIG. 7 (a) shows the characteristics in the case where only the rear surface coupling is performed
without using the acoustic loads 8 and 9, and FIG. 7 (b) shows the characteristics in the case
where the acoustic loads 8 and 9 are used. From the electrical impedance characteristics, it can
be seen that Q0 drops further from 0.45 to 0.41. Also, it can be seen that the resonance
frequency F0 also decreases from 60 Hz to 40 Hz. It can be seen from the output sound pressure
characteristics that the flat band of the bass is expanded from 80 Hz or more to 40 Hz or more.
The speaker device 1 of the embodiment of FIG. 1 can reproduce bass even with a small-volume
enclosure 11. In general, the directionality of the reproduced sound is not strong in the bass, so
that even when performing multi-channel reproduction such as stereo, it is possible not to give a
great sense of discomfort with a single sound source. Therefore, by installing one speaker device
1 in the trunk room 22 as shown in FIGS. 2 and 3 to perform reproduction dedicated to bass, and
installing mid-range and high-pitched speakers for each channel, high sound quality as a whole
can be achieved. Multi-channel playback can be performed. FIG. 8 shows an example of using a
non-circular horizontal shape as the front shape of the diaphragm of the speaker unit 2 or 3 of
the embodiment of FIG. 1 or 4 as still another embodiment of the present invention. Show. FIG.
8A shows the arrangement of the elliptical diaphragm 51, and FIG. 8B shows the arrangement of
the speaker units 2 and 3 having the rectangular diaphragm 52, respectively. The elliptical
diaphragm 51 and the rectangular diaphragm 52 are formed in a cone shape or a planar shape
as a whole. The speaker device 1 of FIG. 1 or FIG. 4 is used by using the front shape as an oblong
shape such as an oval shape or a rectangular shape in a posture such that the diameter X in the
horizontal direction and the diameter Y in the vertical direction become X> Y. 31 can be made
thinner. When the speaker devices 1 and 31 are disposed in a trunk room 22 of a vehicle, for
example, the trunk room 22 may be narrowed and it may be difficult to use. By making the
speaker devices 1 and 31 thinner, it is possible to prevent them from becoming difficult to use
without unnecessarily narrowing the trunk room 22 and the like of the vehicle. As described
above, according to the present invention, drive units for electrically driving a pair of speaker
units with a pair of loudspeaker units facing each other are made to face each other by a bonding
material, and drive axes are on the same straight line. Since the drive units are mechanically
connected to each other so as to maintain the arrangement position, it is possible to mutually
cancel the vibrations generated in the support system or the like of the speaker unit.
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Since the diaphragm is acoustically loaded by the acoustic load, the resonance frequency of the
vibration system can be lowered to enable bass reproduction. The low tone reproduction
becomes possible, and the transient characteristic is also improved by the suppression of the
vibration, so that the reproduction sound quality can be enhanced. The bonding material may be
used to connect the drive parts of the speaker unit, so the number of parts required to support
the bonding material can be reduced, and the cost can be reduced. Further, according to the
present invention, a pair of speaker units are installed, for example, in a passenger compartment
or the like in a trunk room of a passenger car in a state where the driving units are connected by
a coupling material and acoustic load is provided to each speaker unit. , It is possible to take out
good reproduced sound of transient characteristics in the vehicle compartment. Since it is not
necessary to support the bonding material on the vehicle body, cost reduction can be achieved by
reducing the trouble of installing the speaker device on the vehicle body and the number of
parts. Further, according to the present invention, only the reproduction sound can be output
from the opening in a state in which the pair of speaker units connected by the coupling material
and the acoustic load are not directly exposed to the space to be subjected to the sound
reproduction. It can be taken out with high sound quality. Further, according to the present
invention, the drive parts of the pair of speaker units can be connected only by the bonding
material, and the number of parts and labor can be reduced. Further, according to the present
invention, the pair of speaker units are mechanically connected to each other by driving
members for electrically driving the diaphragms by the coupling material, and vibrations
generated in the support system of the speaker units are mutually exchanged. The cancellation
characteristics can be canceled, and the transmission of vibration to the enclosure can be
suppressed by the buffer material, so that the transient characteristics can be improved and the
reproduction sound quality can be enhanced. The coupling material connects the drive parts of
the speaker unit by screwing, so that the number of parts can be reduced and the cost can be
reduced. Further, according to the present invention, the drive parts of the pair of speaker units
can be simultaneously connected by the bonding material, and the time required for the
connection can be eliminated. Further, according to the present invention, since the front surface
shape of the diaphragm of the speaker unit is a laterally long shape such as an ellipse or a
rectangle, in the speaker device, the speaker unit is disposed such that the front surface shape of
the diaphragm is horizontally long. Can be made thinner and the space such as the trunk room
can not be narrowed unnecessarily to avoid making it difficult to use. BRIEF DESCRIPTION OF
THE DRAWINGS FIG. 1 is a simplified cross-sectional view showing a schematic configuration of
a speaker device 1 according to an embodiment of the present invention.
FIG. 2 is a partial front cross-sectional view showing a state in which the speaker device 1 of FIG.
1 is mounted on a vehicle body 20 of a passenger car. 3 is a partial side cross-sectional view
showing a state in which the speaker device 1 of FIG. 1 is mounted on a vehicle body 20 of a
passenger car. FIG. 4 is a simplified cross-sectional view showing a schematic configuration of a
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speaker device 31 according to another embodiment of the present invention. FIG. 5 is a graph
showing the effect of the embodiment of FIG. 4; FIG. 6 is a graph showing the effect of the
embodiment of FIG. 4; FIG. 7 is a graph showing the effect of the embodiment of FIG. 1; FIG. 8 is
a simplified front view showing the front shape of the diaphragms of the speaker units 2 and 3 as
still another embodiment of the present invention. [Description of the code] 1, 31 speaker device
2, 3 speaker unit 2a, 3a, 10a, 40a axis line 4, 5 frame 6, 7 magnetic circuit 8, 9 acoustic load 10,
40 coupling material 12, 13 opening 20 vehicle body 21 Vehicle compartment 22 Trunk room
33, 34 Shock absorbing material 34, 35, 44, 45 Male thread 36, 37, 46, 47 Female thread 51, 52
Vibrator
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