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JPH1141696

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DESCRIPTION JPH1141696
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
compact and lightweight speaker apparatus in which a compact speaker unit and a vibrator are
incorporated in a cabinet or the like.
[0002]
2. Description of the Related Art In order to suppress the vibration of a baffle board of a cabinet
to which a speaker unit is conventionally attached, a vibrator or a vibrator which vibrates in a
direction opposite to the vibration direction of the speaker excited by a diaphragm. For example,
a speaker device having an electric vibration transducer is described in detail in, for example,
Japanese Patent Application Laid-Open Nos. 63-212000 and 1-307398.
[0003]
A speaker device as shown in FIG. 7 is shown in the above-mentioned Japanese Patent
Application Laid-Open No. 62-212000.
In FIG. 7, 1 indicates a ring-shaped magnet, and 2 and 3 indicate a plate and a yoke attached so
as to sandwich the magnet 1 and forming a magnetic gap 4 in a part thereof. The frame 5 of the
speaker unit A is attached to the plate 2, and an edge 6 is provided on the outer peripheral
portion of the frame 5, and the outer peripheral portion of the cone-shaped diaphragm 7 is held
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1
by the edge 6.
[0004]
On the other hand, a voice coil bobbin 8 is attached to the inner peripheral portion of the
diaphragm 7, a voice coil 9 is wound around the bobbin 8, and the voice coil 9 is in the magnetic
gap 4 formed by the plate 2 and the yoke 3. Is inserted in the
[0005]
The configurations shown by reference numerals 1 to 9 above are the basic structure of the
known electrodynamic speaker unit A.
[0006]
One end of a screw 10 is screwed into the center on the back surface side of the yoke 3 of the
speaker unit A, and the other end of the screw 10 has the same configuration as the magnet 1,
plate 2 and yoke 3 in the speaker unit A described above. A magnetic circuit comprising a
magnet 11, a plate 12 and a yoke 13 is attached.
[0007]
A frame 14 is attached to the plate 12, and further, two dampers 15 and 16 are attached to the
frame 14, and the drive coil bobbin 17 is held by the dampers 15 and 16.
[0008]
A drive coil 18 is wound around one end of the drive coil bobbin 17, and the drive coil 18 is
inserted into a magnetic gap 19 formed by the plate 12 and the yoke 13.
A weight 20 is attached to the other end of the drive coil bobbin 17. The vibration system
including the weight 20 is approximately equal to the inertia mass of the vibration system
including the cone-shaped diaphragm 7 and the like in the speaker unit A. It is made.
The configuration shown above by reference numerals 11 to 20 indicates the electric and
vibration transducer B.
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[0009]
In the above configuration, the speaker unit A and the electric / vibration transducer B are
attached to the baffle board 22 of the cabinet 21.
Now, when an electric signal is supplied to the voice coil 9 of the speaker unit A, the voice coil 9
vibrates in the lateral direction in the figure by a known operation, and the cone-shaped
diaphragm 7 is driven to reproduce sound.
[0010]
At this time, when the same electrical signal is applied to the drive coil 18 in the electric /
vibration transducer B, the drive coil 18 also vibrates in the lateral direction in the drawing, and
drives the weight 20 in the same direction.
Here, if the inertia mass of the vibration system including the diaphragm 7 and the like in the
speaker unit A and the vibration system including the weight 20 and the like in the electric /
vibration transducer B is substantially equal, reaction, electricity and vibration received by the
speaker unit A by the vibration system The reaction of the vibration system at the transducer B is
approximately equal.
[0011]
Therefore, the reaction which the speaker unit A receives by the drive of the diaphragm 7 is
canceled by the electric and vibration transducer B, and the vibration of the baffle board 22 of
the cabinet 21 is suppressed.
[0012]
On the other hand, there is a demand for obtaining an inexpensive speaker system by reducing
the volume of the cabinet 21 and achieving miniaturization, but generally, as the volume of the
cabinet 21 is reduced, the speaker unit A To increase the low frequency reproduction limit so as
to suppress the rise of the low range regeneration limit.
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[0013]
However, by increasing the amplitude of the small-sized speaker, the sound pressure in the
cabinet 21 increases, and peaks and valleys occur in the frequency characteristics.
As a method to solve such a problem, a speaker device using a phase-reversal type bass reflex
cabinet to effectively utilize the sound wave emitted from the back of the diaphragm to radiate
the low frequency region without distortion is also widely used. ing.
[0014]
SUMMARY OF THE INVENTION In order to miniaturize the speaker unit and the speaker device,
the volume of the cabinet 21 is reduced, and when it is configured to be lightened with plastic or
the like, the speaker device as shown in FIG. The back surface of the cabinet 21 swings due to the
sound pressure P emitted from the back surface of the damper 16 of the vibration transducer B
and the diaphragm 7 of the speaker unit A.
[0015]
Since the sound pressure in the cabinet 21 increases in inverse proportion to the volume of the
cabinet 21, the volume in the cabinet 21 decreases, and if the sound pressure increases, the back
surface of the cabinet 21 vibrates at a specific frequency, and If it reaches, the entire cabinet 21
is shaken and shaken, the cabinet moves, and the sound quality in the low band is deteriorated,
and there is a problem that a complicated peak and valley is generated in the reproduced sound
in the low band.
[0016]
SUMMARY OF THE INVENTION The present invention provides a speaker device that solves the
problems of overhead, and the first problem to be solved by the present invention is to reduce
the radiation force of the speaker unit diaphragm, that is, the sound pressure in a small and light
speaker device. The sound quality is improved, the small and light cabinet is prevented from
moving, and the driving force of the vibrator is increased compared to the driving force of the
speaker unit A, and the speaker unit A is driven. The reaction force of the exciter B at the time of
reaction cancellation is added to the speaker unit A so as to obtain a speaker device having a
stronger emission in the low frequency range.
[0017]
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The second problem to be solved by the present invention is to use a magnetic circuit of the
speaker unit A and the exciter B to cancel each other to obtain a speaker device having a high
magnetic shielding effect, and the present invention is intended to solve A third problem to be
solved is to provide a cancel magnet between the magnetic circuits of the speaker unit A and the
exciter B to enhance the magnetic shielding effect of the speaker device and to use the cancel
magnet to drive the speaker unit A or the exciter B It is an object of the present invention to
obtain a speaker device that can further enhance
[0018]
A first speaker apparatus according to the present invention is a speaker having a vibrator B
configured to perform vibration in a direction opposite to the vibration direction of the
diaphragm 7A of the speaker unit A. It is an apparatus, which is configured to increase the
driving force of the vibrator B as compared with the speaker unit A and to add the driving force
of the difference between the reaction of the driving force of the speaker unit A and the vibrator
B. is there.
[0019]
The second speaker device according to the present invention is a speaker device having a
vibrator B configured to perform vibration in a direction opposite to the vibration direction of the
diaphragm 7A of the speaker unit A, and the speaker unit The back surface of the magnetic
circuit of A and the back surface of the magnetic circuit of the exciter B are opposed to each
other, and are magnetically canceled each other on the opposite surface.
[0020]
According to the present invention, even in a small and lightweight cabinet, a speaker device can
be obtained in which the radiation power of the sound of the speaker unit A is increased without
being shaken by the vibration of the speaker unit A, and the radiation power of bass is increased.
It is possible to obtain a speaker device which has a small leakage flux and can obtain a strong
driving force.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION A speaker device according to the present
invention will be described below with reference to FIGS.
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FIG. 1 shows a block diagram of an example of the present invention. A speaker unit A is
mounted on a speaker mounting hole 24 formed on the upper side of a baffle board 22 fixed to
the front of a small lightweight cabinet 21 made of synthetic resin or the like. Is attached to the
back surface of the magnet 1 of the first magnetic circuit 25 constituting the speaker unit A via a
cancel magnet 26. A vibrator or an electric / vibration transducer (hereinafter referred to as a
vibrator) B, which will be described later The magnet of the magnetic circuit 27 of 2 is attached,
and the speaker unit A and the exciter B are integrated such that the diaphragms 7A and 7B face
in the opposite direction to each other, to constitute a speaker device.
[0022]
The lower yokes 3 and 34 of the magnets 1 and 33 of the first and second magnetic circuits 25
and 27 of the speaker unit A and the vibrator B are fixed to the ring-shaped cancel magnet 26
through an adhesive. .
[0023]
Moreover, the cabinet 21 of this example radiates the outside of the cabinet 21 by inverting the
phase of the sound from the back of the speaker unit A and the sound pressure from the vibrator
B in the same plane as the speaker mounting holes 24 of the baffle board 22. The opening 23
and the duct 23 are formed to form a phase-reversal bath reflex cabinet.
[0024]
Further, an acoustic signal is supplied to the speaker unit A via the amplifier to the input terminal
TA attached to the back plate 21b of the cabinet 21 and the same as the acoustic signal applied
to the input terminal TA from the input terminal TB to the vibrator B Are supplied through the
phase inverting circuit and the amplifier.
As will be described later, since the speaker device of this example includes the cancel magnet
26, the voice coils of the speaker unit A and the exciter B are wound in opposite directions, and
the magnetizing direction of the magnet is reversed. It is done.
[0025]
In the configuration of FIG. 1 described above, when acoustic signals opposite in phase to each
other are supplied to the input terminals TA and TB, the force of F = m0 α0 acts like the arrow
in FIG. 1 in the speaker unit A. A force of -F = mk αk acts on the vibrator B, where m0 and mk
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are equivalent masses of the speaker unit A and the vibrator B, and α0 and αk are the
diaphragm 7A of the speaker unit A and the vibrator B And the acceleration of 7B.
[0026]
As described above, when the speaker unit A and the vibrator B are driven, the force of -F 'acts on
the force of the speaker unit A in the direction F by the reaction. For the force in the direction,
the force of F 'acts by the reaction.
[0027]
Now, assuming that the cabinet 21 and the baffle board 22 formed in a box shape are formed
into one body, the cabinet 21 receives a force in the left direction in FIG. 1 by the force of the
speaker unit A in the F direction. Since the vibrator B is given a driving force of −F opposite to
the driving force of the speaker, the cabinet 21 is pulled in the right direction in FIG. 1 and the
magnitude and direction of the force to move the cabinet 21 Is determined by the difference
between F and -F, and if the driving force F and the driving force -F are equal, they cancel each
other and the cabinet 21 does not swing, but in this example, the driving force on the vibrator B
side is It is designed to be larger than the driving force of unit A.
[0028]
For example, if the magnetic forces of the magnetic circuits of the first and second magnetic
circuits 25 and 27 are the same and only the diameter of the voice coil on the exciter B side is
increased, the driving force is the exciter. It can be enlarged on the B side.
[0029]
For example, it is assumed that, when the speaker unit A is designed to give a driving force of 2F,
the vibrator B is designed to give a driving force of -3F.
The reaction force of the speaker unit A at this time, -2F 'and the reaction force + 3F' of the
exciter B become -2F-(+ 3F ') = F', and the vector of the reaction force F 'is the diaphragm of the
speaker unit A It can be added to the 2F force of 7A to form 2F + F '= 3F (where F = F').
[0030]
Generally, the force F = m0α0 applied to the diaphragms 7A and 7B in the case of a dynamic
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speaker is determined by the following equation (1).
[0031]
Here, WE is an audio signal input applied to the speaker unit A or the exciter B, Bg is the
magnetic flux density of the gap of the magnetic circuit, Vv is the effective volume of the voice
coil, δ is the resistivity of the material of the voice coil, Q is the resonance sharpness of the
speaker unit A or the vibrator B, and the speaker unit A and the vibrator B cancel each other by
appropriately selecting the above-mentioned WE, Bg, Vv, δ, Q or m0, mk The force can be
selected to be F <-F under various conditions.
[0032]
Therefore, to set F = m0 α0 <mk αk, the equivalent mass m0 of the speaker unit A and the
equivalent mass mk of the exciter B should be m0 <mk or the magnetic flux density Bg of the gap
of the magnetic circuit of the speaker unit A and It is the easiest to use a magnetic circuit of the
exciter B stronger than the magnetic circuit of the speaker unit A so that the magnetic density Bg
'of the gap of the magnetic circuit of the exciter B is Bg <Bg'. Method.
With such a configuration, the small and light cabinet 21 does not swing even if it is not made of
a heavy material, and it is possible to prevent the weakening of the sound radiation force due to
the action and reaction force and a powerful radiation speaker A device is obtained, which in
particular can increase the radiation power of the bass.
[0033]
As the speaker unit A of FIG. 1, the same general small-sized speaker unit A as used in FIG. 7 can
be used.
In addition, it is possible to use a magnetic shield type speaker unit A provided with a cancel
magnet 26 opposite to the magnetizing direction of the magnet 1 on the back surface of the yoke
3 and a shield cover as needed.
[0034]
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On the rear surface of the speaker unit A, a vibrator B described later with reference to FIGS. 2
and 3 is fixed so that the diaphragm 7A of the speaker unit A and the diaphragms 7A and 7B of
the vibrator B face in opposite directions.
[0035]
An example of the configuration of the vibration exciter B used in the present invention will be
described with reference to FIGS. 2 and 3.
In FIG. 2, the vibrator B of this example is formed of a disk-shaped plate material, and a stepped
portion is formed concentrically so as to surround the center pole 34 a of a columnar shape
embedded in the center and the center pole 34 a. A yoke 34 having an inverted T-shaped cross
section in which the magnet guide 34b is integrated, and a ring-shaped magnet 33 magnetized in
the thickness direction and having an inner diameter fitted and joined to the magnet guide 34b
of the yoke 34. A magnetic circuit of a metal part is constituted by a ring-shaped plate 31 bonded
to the upper surface of the magnet 33 with an adhesive or the like and a funnel-shaped frame 37
made of iron or the like fixed on the plate 31.
[0036]
A state in which a spacer such as kraft paper is wound around the inner periphery of the voice
coil bobbin 38 in order to insert the voice coil 38a wound around the voice coil bobbin 38 in the
concentric magnetic gap 47 between the center pole 34a and the plate 31 Then, the voice coil
bobbin 38 is inserted into the center pole 34 a from the upper side, and the position of the voice
coil 38 a is set so as to be disposed in the magnetic gap 47.
[0037]
A corrugated concentric damper 39 is bonded between the outer diameter of the upper end of
the voice coil bobbin 38 and the bottom of the frame 37 with an adhesive or the like, and the
inner diameter of the diaphragm 7B has a plurality of vents 48 formed in a funnel shape. The
part is fitted and joined to the outer diameter of the upper end of the voice coil bobbin 38, and
the largest diameter part of the diaphragm 7B is joined to the largest diameter opening of the
frame 37 via the arrow 42.
[0038]
After the adhesive is dried, the spacer inserted into the inner diameter of the voice coil bobbin 38
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is removed, and a cap 44 having a plurality of vent holes 48 formed therein is joined to the upper
surface of the voice coil bobbin 38.
[0039]
A lead wire is drawn from the voice coil 38a, connected to the input terminal 45 through the
tinsel wire 46, and an electrical signal is supplied to the voice coil 38a through the input terminal
45.
Although the case where the magnet 33 magnetized in advance is assembled has been described
above, the non-magnetized magnet 33 may be magnetized at the final assembly stage.
In the speaker device shown in FIG. 1, the direction of magnetization of the magnet of the
speaker unit A is opposite to that of the magnet, or the winding direction of the voice coil 38a is
opposite to that of the speaker unit A.
Moreover, what is necessary is just to supply an inversion drive signal in what was wound in the
same direction.
[0040]
FIG. 3 shows another example of the configuration of the vibrator of the present invention, and
the parts corresponding to those in FIG.
[0041]
In FIG. 3, the configuration up to the magnetic circuit and the lower damper 39a having air
permeability is the same as that of FIG. 2, but air permeable formed with a cloth between the
maximum outer diameter opening of the frame 37 and the outer diameter of the voice coil
bobbin 38 A good upper damper 39b is provided.
The outer diameter portion of the upper damper 39b is fixed to the frame 37 via the arrow 42,
and the upper damper 39b and the input terminal 37 are connected via the tinsel wire 46, and
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the tinsel wire 46 and the voice coil 38a are connected. There is.
In this configuration, the upper damper 39b constitutes the diaphragm 7B.
Also, the cap 44 which is covered on the upper surface of the voice coil bobbin 38 is also
selected from a material having good breathability such as cloth.
[0042]
In the speaker apparatus of FIG. 1 described above, the upper side (diaphragm side) of the
magnet 1 constituting the first magnetic circuit 25 of the speaker unit A is N pole and the lower
side (rear surface) is S pole. A cancel magnet 26 is joined to the yoke 3 of the speaker unit A as
an S pole of the same polarity and an N pole on the opposite side.
[0043]
The upper side (diaphragm side) of the magnet 33 of the second magnetic circuit 27 of the
vibrator B is the S pole, and the lower side (back side) of the magnet 33 is the N pole. It joins and
integrates so that the N pole repels.
That is, since the cancel magnet 26 is disposed between the speaker unit A and the exciter B, the
external leakage magnetic flux is largely suppressed by the cancel magnet 26 and the same
magnetic flux as the effective magnetic flux of the magnetic gap 9 of the speaker unit A can be
obtained. As compared with the case where the cancel magnet 26 is not used, it is possible to
increase by about 30%, and it becomes possible to increase the driving force even with the small
speaker unit A.
[0044]
The loudspeaker apparatus shown in FIG. 4 shows another configuration of the present
invention, and as the vibrator B, the vibrator of the configuration of FIG. 2 or FIG. 3 is used.
[0045]
A magnet guide 34c is formed on the bottom of the yoke 34 of the vibrator B, and a cylindrical
center pole 34d is planted in the direction opposite to the direction in which the center pole 34a
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of the vibrator B is planted.
[0046]
The inner diameter of the cancel magnet 26 formed in a ring shape is fitted to the disk-shaped
magnet guide 34 c of the yoke 34.
The lower side of the cancel magnet 26 is magnetized in the magnet 33 of the exciter B shown in
FIG. 4 to the N pole of the same pole as the upper side (rear side), and the upper side is
magnetized in the thickness direction to become the S pole. It is fixed on the yoke 34 with an
adhesive or the like.
[0047]
A ring-shaped second plate 51 a is fixed to the upper side of the cancel magnet 26 with an
adhesive.
[0048]
Furthermore, a second magnet for driving the speaker unit A magnetized in the thickness
direction such that the upper side is the N pole and the lower side is the S pole with the same
diameter as the cancel magnet 26 on the second plate 51a. The third ring-shaped plate 51 b is
joined onto the second magnet 50.
[0049]
A second magnetic gap 52 is formed between the outer diameter of the center pole 34d
implanted from the center position of the yoke 34 and the inner diameter of the second plate
51a.
A third magnetic gap is formed between the inner diameter of the third plate 51b and the outer
diameter of the center pole 34d on the upper side of the center pole 34d with respect to the
outer diameter of the implanted center pole 34d.
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[0050]
Furthermore, the second magnetic gap is inserted into the relatively long voice coil bobbin 55
which is inserted into the center pole 34d at a predetermined interval and held swingably by the
two upper and lower dampers 53a and 53b to prevent rolling. The voice coil 54 is wound around
the corresponding position of the part 52.
[0051]
The outer diameter portions of the upper and lower dampers 53a and 53b constituting the
double damper are held near the bottom outer diameter of the funnel-shaped metallic frame 56,
and the inner diameter portion of the cone-shaped diaphragm 7A is the outer diameter of the
voice coil bobbin 55. Bonded, the outer diameter portion is held by the arrowhead 59 at the
maximum outer peripheral position of the frame 56 through the edge 58.
Further, the cap 62 is joined and held on the diaphragm 7A or the voice coil bobbin 55.
Reference numeral 60 denotes a tinsel wire, and 61 denotes an input terminal.
[0052]
According to the above configuration, in speaker unit A, magnetic flux φ1 and magnetic flux φ2
are added in second magnetic gap 52 for cancel magnet 26 and drive magnet 50, and
furthermore, the cancel magnet 26 can suppress leakage flux At the same time, the amount of
magnetic flux passing through the second magnetic gap 52 can be significantly increased by the
effect of suppressing the leakage flux.
[0053]
5 and 6 show another configuration of the present invention, and FIG. 5 is the same as that
described in FIG. 7 on the bottom surface of the loudspeaker unit A of the electrodynamic type,
and the disk of the vibrator B described in FIG. The pole piece 34a is erected on the bottom
surface of the yoke 3 with an adhesive or a screw, and the ring-shaped magnet 33 is joined to the
bottom surface of the yoke 3. The weight 63 consisting of a ring wire is added near the inner
diameter of the lower damper 39a to balance the effective mass of the speaker unit A and the
effective mass of the vibrator B. ing.
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[0054]
The disk-shaped yoke 34 of the vibrator B described in FIG. 2 is removed from the bottom
surface of the general speaker unit A similar to that described in FIG. The center pole 34a is
planted on the bottom surface of the yoke 3 and bonded with an adhesive or a screw, and the
magnet 33 is bonded to the bottom surface of the yoke 3.
[0055]
In FIG. 5 and FIG. 6, when the magnet 1 of the first magnetic circuit 25 constituting the speaker
unit A is magnetized with NS in the thickness direction, the magnet 33 of the second magnetic
circuit 27 constituting the vibrator B. The magnet is magnetized in the thickness direction
opposite to the magnet 1 and magnet 1 so that the magnetomotive force is repelled by
sandwiching the yoke 3 to cancel the leakage flux, and the flux in the magnetic gap of the
speaker unit A Increase the density to increase the output and increase the bass radiation power.
[0056]
In the configurations shown in FIGS. 5 and 6, the driving directions of the speaker unit A and the
vibrator B, that is, the same direction when the driving force F applies the same electric signal,
the winding direction of the voice coils 38a and 54 or In response to the electric signal supplied
to the input terminal TA of the speaker unit A via the amplifier, the electric signal supplied to the
input terminal TB of the vibrator B is inverted via the inverting circuit to drive the drive power of
the speaker unit A The driving force of the vibrator is set to -F for F.
[0057]
Also, a variable resistor or the like is provided in the amplifier system path of the speaker unit A
to make the electric signal smaller than the electric input of the exciter B, thereby increasing the
driving force on the exciter B side. You may make it like this.
[0058]
According to the speaker apparatus of the present invention, since the cancel magnet 26 is added
between the magnetic circuits 25 and 27 of the vibrator B to the speaker unit A, it is possible to
suppress the leakage flux and to pass through the magnetic gap. The driving force of the speaker
unit A and the driving force of the reaction between the speaker unit A and the vibrator B can be
increased by increasing the magnetic flux density to increase the output and increasing the
driving force of the vibrator B side more than the speaker unit A side. Since the difference driving
force can be added, it is possible to obtain particularly a thing that can increase the radiation
power of the bass.
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[0059]
Brief description of the drawings
[0060]
1 is a side sectional view of the speaker device of the present invention.
[0061]
2 is a cross-sectional view of a vibrator used for the speaker device of the present invention.
[0062]
3 is a cross-sectional view of another vibrator used for the speaker device of the present
invention.
[0063]
4 is another side sectional view of the speaker device of the present invention.
[0064]
5 is yet another side sectional view (I) of the speaker device of the present invention.
[0065]
6 is another side sectional view (II) of the speaker device and the like of the present invention.
[0066]
7 is a partial sectional view of the conventional speaker device.
[0067]
Explanation of sign
[0068]
A: Speaker unit, B: Vibrator, 7A, 7B: Diaphragm, 21: Cabinet, 22: Puffle board, 25, 27: First and
second magnetic circuits
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