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JP2006246288

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2006246288
PROBLEM TO BE SOLVED: To provide an exciter which is reduced in size, reduced in size,
reduced in damage to a coil surface, and easily assembled, and a flat speaker using the exciter.
SOLUTION: Two voice coils 4, 5 are arranged in a vibration direction at a predetermined interval
and in opposite phase to each other, and each voice coil 4, 5 is connected in series to be housed
in a housing 2. A magnet 7 magnetized in the thickness direction is movably disposed
substantially in the middle between voice coils 4 and 5 fixed in the vibration direction, and an
audio current flowing through each voice coil 4 and 5 The magnetic pole of the voice coils 4 and
5 is changed according to the flow direction of the above, and the magnet 7 is configured to
move in the voice coils 4 and 5 as an exciter 1. [Selected figure] Figure 2
エキサイターおよびスピーカ
[0001]
The present invention relates to, for example, an exciter as a vibrating element for driving a
diaphragm or the like, and a flat type speaker in which the exciter is fixed to the diaphragm.
[0002]
In recent years, flat-plate speakers in which an exciter (vibrator) is fixed to a flat diaphragm have
begun to be used in various applications, taking advantage of the ability to be thin and the
advantage of wide diaphragms.
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1
In particular, in the future, flat-panel speakers will be proposed that use a low-cost, compact and
lightweight exciter for installation with display media such as liquid crystal panels, and a guide
plate that emits sound printed on a diaphragm. However, problems remain in cost, weight
reduction, coil reliability, and the like.
[0003]
For example, in Japanese Patent Application Laid-Open No. 2001-359188 (Patent Document 1),
as an exciter and a flat type speaker using such an exciter, it is wound around a bobbin part fixed
to a diaphragm and integrated, and this bobbin part A voice coil for applying vibration to the
diaphragm, an exciter having a magnetic gap into which the voice coil is inserted, and a magnetic
circuit portion forming the magnetic gap are fixed on the inner surface side to accommodate the
exciter. And a housing coupled to the diaphragm.
[0004]
In the invention of this patent document 1, the exciter is housed in a housing connected to the
diaphragm to form a unit structure, whereby the entire exciter including the terminal and the
lead wire is protected from the external impact by the housing. The drive unit can be used
regardless of the dimensions of the diaphragm, which makes it possible to significantly reduce
the manufacturing cost.
[0005]
Further, as means for reducing the size and weight of the magnetic circuit, in Japanese Patent
Application Laid-Open No. 56-46398 (Patent Document 2), substantially annular grooves for coil
winding are formed in a phase, and a plurality of magnetic legs are provided. A core formed of a
substantially bobbin-like ferromagnetic body, a coil wound so that the magnetic poles at both
ends are magnetized in the same pole in the annular groove of the core, and a periphery of the
core A moveable magnet loudspeaker is disclosed which is vibratably disposed and which
comprises substantially ring-shaped moveable magnets which have oppositely poled poles at
their axial ends and which have a cone coupled thereto.
[0006]
In the invention described in Patent Document 2, by arranging the coil and the movable magnet
as described above, the number of parts constituting the magnetic circuit can be reduced as
compared with the prior art, and the size and weight of the magnetic circuit can be reduced. It is
possible to increase the number of turns to eliminate the limitation of the input signal applied to
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the coil.
JP, 2001-359188, A (claim 1, paragraph 0006) JP, 56-46398, A (claim 1, detailed explanation
(8) and (9) of the invention)
[0007]
However, as in the invention described in Patent Document 1, in the magnetic circuit in which
the magnetic gap is formed by the yoke and the magnet as sandwiching the voice coil as the
drive part of the exciter that vibrates the diaphragm, the entire drive part becomes large and
light weight There is a problem that it becomes an obstacle for making the system smaller and
smaller.
[0008]
Further, as in the invention described in Patent Document 2, even if the weight and size of the
magnetic circuit are reduced without forming the magnetic gap, as long as the magnet is
disposed so as to face the voice coil surface, In terms of efficiency, they will be closer.
As a result, there is a problem that the coil surface is damaged by the magnet due to the rolling
phenomenon.
[0009]
Further, as in the invention of Patent Document 2, if a yoke or the like made of a magnetic
material is present in addition to the movable magnet, a suction force acts between the magnet
and the magnetic material, which makes the assembly operation difficult. There's a problem.
[0010]
Furthermore, if the heat radiation from the voice coil is not sufficiently coped with, there is also a
problem that the coil may collapse or be damaged.
[0011]
SUMMARY OF THE INVENTION The present invention was made in view of such problems, and
provides an exciter that is light in weight and miniaturized, eliminates damage to the voice coil
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surface, and that is easy to assemble, and a flat panel speaker using the exciter. Purpose.
[0012]
In order to achieve the above object, the invention according to claim 1 of the present invention
arranges two voice coils with a predetermined interval in the vibration direction and in opposite
phases to each other, and The coils are connected in series and fixed in the housing, and a
magnet magnetized in the thickness direction is movably disposed substantially in the middle of
the voice coil disposed in the vibration direction, and flows in each of the voice coils The exciter
is characterized in that it is configured to move the magnet in the voice coil by changing the
magnetic pole of the voice coil in accordance with the flow direction of the voice current.
[0013]
The invention according to claim 2 of this invention is the exciter according to claim 1, wherein
the housing is open at the top, and slightly larger than the outer diameter of the voice coil bobbin
holding the two voice coils therein. It is characterized by having a void with a large diameter.
[0014]
The invention according to claim 3 of this invention is the exciter according to claim 1, wherein
the housing is open at the top, and slightly larger than the outer diameter of the voice coil bobbin
holding the two voice coils therein. It is characterized in that a coupler having a large diameter
void portion and capable of holding the vibrating body is provided in the void portion so as to be
vertically movable.
[0015]
Also, in the exciter according to claim 1, in the invention according to claim 4, the magnet is fixed
to a coupler disposed movably up and down in the housing, and the magnet is not connected to
each voice coil. It is characterized in that it is positioned in the middle between the voice coils at
the time of energization and configured to rise or fall according to the flow direction of the audio
current when the audio current flows.
[0016]
The invention according to claim 5 of this invention is the exciter according to claim 1, wherein
the voice coil bobbin has a cylindrical body having an outer diameter slightly smaller than the
inner diameter of the gap formed in the housing. Two grooves are formed on the outer periphery
at a predetermined interval, and voice coils are provided in the grooves in opposite phases to
each other, and the voice coils are connected in series. It is.
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[0017]
The invention according to claim 6 of this invention is characterized in that, in the exciter
according to any one of claims 1 to 5, the voice coil is covered with an adhesive. It is.
[0018]
The invention according to claim 7 of this invention is the exciter according to claim 2 or 4,
wherein the coupler is a first damper provided on the top of the housing, and an air gap formed
in the housing. It is supported by the 2nd damper provided in, and it is comprised so that it may
move up and down in the said clearance gap part.
[0019]
The invention according to claim 8 of the present invention is the exciter according to any one of
claims 2, 4 or 6, wherein the coupler is a disk-shaped substrate for mounting a vibrator. A
cylindrical first body for mounting a first damper formed at the central portion of the back
surface of the substrate, and a diameter for mounting a magnet continuously connected to the
first body via a step portion. A second body with a small diameter and a third body with a smaller
diameter for mounting a second damper, which is formed to project from the tip end face of the
second body, and integrally molded of a synthetic resin It is characterized by being a thing.
[0020]
The invention according to claim 9 of the present invention is the exciter according to claim 1,
wherein the housing is formed with a slit portion for drawing the lead wire of the voice coil out
of the housing. It is characterized by
[0021]
The invention according to claim 10 of the present invention is the exciter according to claim 1,
wherein the housing is formed with a plurality of adhesive filling ports having a predetermined
depth along the upper opening. It is characterized by
[0022]
According to an eleventh aspect of the present invention, there is provided a flat type
loudspeaker characterized in that the exciter according to any one of the first to tenth aspects is
attached to the back surface portion of the flat diaphragm.
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[0023]
In the exciter according to the present invention, two voice coils are arranged at predetermined
intervals in the vibration direction and in opposite phases to each other, and each voice coil is
connected in series and fixed in the housing to be vibrated. Since the magnet magnetized in the
thickness direction is movably disposed at substantially the middle portion in the voice coil
disposed in the direction, it is arranged according to the flow direction of the voice current
flowing in each voice coil. The vibrator is driven to vibrate by moving the magnet between two
voice coils and transmitting the movement of the magnet to the vibrator through, for example, an
assembly such as a coupler.
[0024]
In particular, in the present invention, when arranging the two voice coils in the vibration
direction at a predetermined interval, the voice coils are made to have opposite phases to each
other, and the voice coils are connected in series, Since the magnet is mounted on the inner side
so as to be vertically movable, it is possible to eliminate the members made of the magnetic
material other than the movable magnet and to make the whole compact, lightweight and easy to
assemble.
[0025]
Further, since the magnet is magnetized in the thickness direction, that is, the upper part as the N
pole and the lower part as the S pole, the magnetic poles of the voice coils connected in series to
be in opposite phase to each other When an audio current is applied so as to be S-N-N-S in the
vibration direction, the magnet moves to the upper side in the vibration direction, and when the
current direction is reversed, the magnet moves to the lower side in the vibration direction. By
repeating such an operation, an exciter with a simple configuration can be obtained.
[0026]
At that time, the voice coil is mounted on the outside of the cylindrical cylinder constituting the
voice coil bobbin in the grooves formed with a gap so as to be in opposite phase to each other,
and the voice coil is inside the voice coil bobbin By providing the magnet vertically movable, the
magnet can be moved without damaging the voice coil.
[0027]
Further, when the voice coil is attached to the voice coil bobbin, by covering the surface of the
voice coil with an adhesive, the heat dissipation from the voice coil at the time of driving is
absorbed by the adhesive, and the winding of the voice coil or resistance due to temperature rise.
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It is possible to prevent a rise in value and obtain stable sound pressure.
[0028]
In the present invention, a voice coil is fixed by fixing a magnet moving inside between two voice
coils to a coupler movably mounted in a housing and movably supporting the coupler with two
dampers. The response of the coupler to the vibration of the magnet due to the audio current
from B. can be improved, and the reproduction frequency band in the high region can be
broadened.
Further, the resin can be molded of this coupler to further reduce the weight of the exciter.
[0029]
Further, by configuring the coupler movably held in the housing so that one end of the two
dampers supporting the coupler in the housing and the magnet can be fixed, predetermined parts
can be coaxial with each other. The exciter can be easily assembled without using special jigs
such as positioning jigs.
[0030]
Further, by providing a slit having a predetermined depth for drawing out the lead wire of the
voice coil to the outside of the housing in the housing holding the exciter consisting of the voice
coil and the magnet, wiring of the voice coil becomes easy. The coil wire which becomes a voice
coil can be used as a lead wire as it is.
In addition, since the wiring does not appear to the outside, the risk of disconnection or the like
can be eliminated.
[0031]
Furthermore, by forming an adhesive filling port having a predetermined depth into which the
adhesive is poured, specifically, the entire length of the voice coil bobbin, along the periphery of
the opening of the void formed in the housing, By pouring the adhesive from the adhesive filling
port, the voice coil bobbin can be securely fixed to the housing, the work of covering the voice
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coil surface with the adhesive can be facilitated, and the voice coil bobbin is securely fixed in the
housing be able to.
[0032]
Hereinafter, an exciter according to the present invention and an embodiment of a speaker using
the exciter will be specifically described based on the attached drawings.
The present invention is not limited to the illustrated embodiment, and two voice coils are
arranged with a required interval in the vibration direction so as to be in reverse phase with each
other, and the voice coils are connected in series. And a magnet is movably disposed between the
two voice coils, and the voice current flowing through the voice coil changes the magnetic pole of
the voice coil to move the magnet in the vibration direction of the voice coil. Various changes can
be made without departing from the scope of the invention.
[0033]
The exciter 1 according to the present invention basically comprises a housing 2 consisting of a
bottomed cylindrical body having a cavity 3 with an open upper portion, as is apparent from
FIGS. 1 to 3 and 5 and this housing The two voice coils 4 and 5 fixed in 2 and the magnet 7
movably held vertically in the two voice coils 4 and 5 are constituted.
The two voice coils 4 and 5 basically have the same diameter and are formed of the same
material.
[0034]
The housing 2 is obtained by integral molding of a synthetic resin, and the inner diameter of the
space 3 changes depending on the use of the exciter.
Further, the shape thereof is not particularly limited, but a vibrating body supported via a
coupler described later by forming a flange 2a having a required width extending outward at the
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opening of the space 3 Is preferable because it can be held more reliably.
[0035]
Further, as shown in FIG. 1, the upper surface portion of the housing 2 has a predetermined
depth along the opening edge of the air gap portion 3, specifically, the vibration directions of the
two voice coils 4 and 5. A plurality of adhesive agent filling ports 8 and 8 having the same depth
as the entire length of the voice coil bobbin 6 described later held at a predetermined interval are
formed, and a part of A slit portion 9 is formed from the opening edge to reach the outer
peripheral surface of the housing 2, and the lead wires 4 a and 5 a of each voice coil 4 and 5 can
be easily pulled out through the slit portion 9. .
[0036]
As shown in FIG. 4, the two voice coils 4 and 5 are spaced apart from each other in the vibration
direction of the voice coil by a predetermined interval, and each voice coil 4 and 5 is in reverse
phase, that is, each voice Arranged so that the magnetic poles of the coils 4 and 5 are the same,
connected the voice coils 4 and 5 in series to increase the magnetic flux at the middle point of
the connected coils, and reduced the weight of the exciter attached to the vibrator It is a thing.
The two voice coils 4 and 5 configured in this way are both fixed in the housing 2 and used.
[0037]
Therefore, when the magnet 7 magnetized in the thickness direction is disposed movably in the
vertical direction inside the voice coils 4 and 5, and a voice current is flowed from the voice coil
4 to the voice coil 5, the voice coil 4, The magnetic pole 5 becomes S-N-N-S and the magnet 7
moves upward.
Conversely, when a voice current is flowed from the voice coil 5 to the voice coil 4, the magnetic
poles of the voice coils 5 and 4 become N-S-S-N, and the magnet 7 moves downward. By
repeating the operation, the magnet 7 moves up and down in the space between the voice coils 4
and 5.
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[0038]
Specifically, as is apparent from FIG. 5, the voice coils 4 and 5 have a required interval on the
outer peripheral portion of a cylindrical body whose outer diameter is slightly smaller than the
inner diameter of the air gap portion 3 of the housing 2. It is used by being installed in the
concave grooves 6a and 6b formed in the prior art.
[0039]
The magnet 7 is in the form of a ring and, as is particularly apparent in FIG. 5, the voice coil 4
fixed in the vibration direction and fixed to the coupler 10 disposed in the gap 3 of the housing
2. It is configured to move up and down inside between five.
[0040]
That is, the coupler 10 is, for example, a disk-shaped substrate 11 for mounting a thin diaphragm
such as a thin vibrator such as a liquid crystal panel or a flat diaphragm, and a stepped portion at
the center of the back surface of the substrate 11. A cylindrical first body portion 13 for
mounting a first damper 17 formed through 12 and a magnet 7 connected to the first body
portion 13 via a step portion 14 are mounted. And a third body 16 having a small diameter for
mounting the second damper 18, which is formed to project from the center of the tip surface of
the second body 15. It is
The respective parts are integrally molded of a synthetic resin.
[0041]
In forming the third body, as shown in FIG. 5, a recess 20 is formed at the center of the tip end
surface of the second body 15, and a third body with a small diameter is formed at the center of
the recess 20. By forming the protrusions 16 in a projecting manner, the inner periphery of the
second damper 18 can be securely fixed to the recess 20, which is a preferable embodiment.
[0042]
The first damper 17 has a mounting portion 17b to the housing 2 vertically provided below the
outer peripheral edge of the damper main body 17a whose outer diameter is substantially equal
to the outer diameter of the flange 2a of the housing 2; In the main body 17a, a through hole 17c
having a diameter substantially equal to the outer diameter of the first barrel of the coupler 10 is
formed.
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[0043]
The first damper 17 is fixed to the coupler 10, provides elasticity when the coupler 10 is
movably held in the space 3 of the housing 2 in the vertical direction, and the movable range of
the coupler 10 is In order to make it larger, it is preferable to bulge the inside portion of the flat
outer peripheral portion upward as shown in FIG.
[0044]
Further, the second damper 18 forms a flat surface 18b in contact with the inner bottom surface
3a of the gap 3 of the housing 2 on the outer peripheral portion of the damper main body 18a,
and bulges a portion other than the flat surface 18b upward. A projecting portion 18d is
integrally formed with a through hole 18c for contacting the outer peripheral portion of the third
barrel 16 of the coupler 10 at the central portion thereof.
[0045]
The outer diameter including the flat surface 18b of the second damper 18 is slightly smaller
than the inner diameter of the inner bottom surface 3a of the space 3 in the housing 2, and the
inner diameter of the through hole 18c formed in the protrusion 18d. Is approximately equal to
the outer diameter of the third barrel 16 of the coupler 10.
[0046]
In the exciter 1 of the present invention, in order to reduce the weight, a magnetic material is
used as a yoke constituting a magnetic circuit, except for the magnet 7 which is moved in the
space 3 of the housing 2 in the vertical direction to vibrate and vibrate. Not.
[0047]
In order to produce the exciter 1 using such members, first, the through hole 17c of the first
damper 17 is fitted to the first body 13 constituting the coupler 10, and the flat peripheral edge
of the through hole 17c is obtained. The part 17 d is fixed to the step 12 of the coupler 10 with
an adhesive.
[0048]
Next, the through hole 7a of the magnet 7 is fitted to the second barrel 15 of the coupler 10, and
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the upper flat surface 7b of the magnet 7 is fixed to the step 14 of the coupler 10 with an
adhesive.
The unit assembled in this manner is called an upper unit.
[0049]
On the other hand, after the second damper 18 is fitted in the space 3 of the housing 2 and the
flat surface 18b of the outer peripheral portion thereof is fixed to the inner bottom surface 3a of
the space 3 with an adhesive, The coil bobbin 6 is inserted into the air gap portion 3 with the
held voice coils 4 and 5 positioned outside, and the bottom of the voice coil bobbin 6 is fixed on
the flat surface 18b of the second damper 18 with an adhesive. Do.
That is, the flat portion 18 b of the second damper 17 is fixed by an adhesive so as to be
sandwiched between the bottom of the housing 4 and the bottom of the voice coil bobbin 6.
At this time, the lead wires 4 a and 5 a of the voice coils 4 and 5 are accommodated in the slit
portion 9 provided in the housing 2.
[0050]
Next, the adhesive B is injected into the adhesive filling port 8 provided on the upper surface of
the housing 2, and the voice coil bobbin 6 is fixed to the inner peripheral surface of the housing
2 by the adhesive B. The surface of the is covered with an adhesive B.
The unit assembled in this manner is called a lower unit.
[0051]
In addition, as an adhesive agent which covers the surface of the voice coils 4 and 5, the adhesive
with high heat resistance which can endure the thermal radiation from a voice coil is preferable.
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Further, since the adhesive absorbs the heat from the voice coil, it is possible to prevent the voice
coil from being broken and the resistance value rising due to the temperature rise, and to obtain
a stable sound pressure.
[0052]
As a final step of the assembly, the upper unit and the lower unit are combined, but at this time,
the third barrel 16 of the upper unit with the adhesive applied to the periphery and the through
hole 18c formed in the second damper 18 of the lower unit. Then, the mounting portion 17b
formed on the first damper 17 in the upper unit is fitted on the outermost peripheral surface of
the housing 2 of the lower unit, ie, the outer peripheral portion of the flange 2a, and both are
fixed with an adhesive It is
[0053]
By assembling the exciter 1 in this manner, the parts can be fitted and assembled on the same
axis, and the magnet 7 is disposed in the middle of the two voice coils 4 and 5 in the voice coil
bobbin 6. The exciter 1 can be easily made without preparing a dedicated jig.
[0054]
When the exciter 1 is assembled, in other words, when the exciter 1 is not driven, the magnet 7 is
located at an intermediate portion between the voice coils 4 and 5, as is apparent from FIG.
[0055]
Since exciter 1 of this configuration is magnetized in the thickness direction so that the upper
part of magnet 7 is the N pole and the lower part is the S pole as described above, the magnetic
poles of the two voice coils 4 and 5 vibrate When an audio current flows so as to be S-N-N-S in
the direction, both of the voice coils 4 and 5 are fixed to the housing 2, so the magnet 7 rises to
the upper part in the vibration direction. The one-piece coupler 10 also rises.
When the current direction is reversed, the magnetic poles of the voice coils 4 and 5 are also
reversed as in NS-S-N, and the magnet 7 is moved downward in the vibration direction, so that
the coupler 10 is also lowered.
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By repeating such an operation, the magnet 7 vertically moves in the air gap portion 3 and
vibrates. Therefore, by attaching a diaphragm as a vibrator to the substrate 11 of the coupler 10,
the exciter 1 can be used as a speaker It can be a driving body.
Furthermore, by mounting a vibrator on which an advertisement or the like is printed and
displayed on the surface of the substrate 11, the vibrator can be used as a moving display.
[0056]
In addition, in the configuration of each member described above, for fixing the two members, a
concave portion (not shown) serving as an adhesive reservoir is provided on one side or both of
the opposing members, and the concave portion is filled with the adhesive and fixed. Adhesion
can also be enhanced.
[0057]
FIGS. 6 and 7 show a flat speaker 20 using the exciter 1 having the above configuration, in which
two exciters 1, 1 are arranged in parallel and fixed in a rectangular speaker frame 21, The
diaphragm 22 is joined to the edge 23, the outer peripheral edge of the edge 23 is fixed to the
speaker frame 21 by the pressing plate 24, and the back surface of the diaphragm 22 is joined to
the upper surface of the substrate 11 of each exciter 1, 1 It adheres and it is set as the flat type
speaker 20. FIG.
Therefore, if voice current is supplied to the voice coil of each of the exciters 1 and 1 at regular
intervals in the forward and reverse directions, the vibration of the magnet is transmitted to the
diaphragm 22 through the exciter to exhibit the function as a flat speaker can do.
[0058]
In the exciter according to the present invention, two voice coils spaced in the vibration direction
and arranged in opposite phases to each other are connected in series, and magnetized in the
thickness direction inside the two voice coils. The magnet is provided so as to be movable in the
vibration direction.
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Therefore, by taking out the movement (vibration) of the magnet to the outside through an
assembly such as a coupler, the vibration can be effectively used, so that the application is not
limited only to the speaker, and an advertisement medium from which sound is emitted
Furthermore, by using a diaphragm with a large surface area, it can be used in a wide range of
fields, such as use as a sound collection microphone.
[0059]
It is a partially cutaway top view which shows an example of the exciter concerning this
invention.
FIG. 2 is a half cross-sectional view of the exciter shown in FIG. 1 when not driven.
FIG. 2 is a half cross-sectional view of the exciter shown in FIG. 1 when driven.
It is a schematic explanatory drawing which shows the voice coil of an exciter shown in FIG.
It is a schematic explanatory drawing which shows an example of a structure of the exciter
shown in FIG.
It is a top view showing an example of a flat type speaker using an exciter concerning this
invention.
It is sectional drawing along ZZ in FIG.
Explanation of sign
[0060]
Reference Signs List 1 exciter 2 housing 2a flange 3 air gap portion 4,5 voice coil 4a, 5a voice
coil lead wire 6 voice coil bobbin 6a, 6b groove 7 magnet 7a magnet through hole 8 adhesive
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filling port 9 slit portion 10 coupler 11 substrate 12 14 step 13 first body 15 second body 16
third body 17 first damper 18 second damper 20 flat type speaker 21 speaker frame 22
diaphragm 23 edge 24 pressure plate
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