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DESCRIPTION JP2008035261

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DESCRIPTION JP2008035261
An object of the present invention is to make it possible to easily check the positional
relationship with a center pole when attaching a voice coil of a speaker. Also, even after the voice
coil is attached, it is possible to correct the positional relationship between the voice coil and the
center pole. SOLUTION: In a speaker 1 for detecting a capacitance formed between a voice coil 4
and a center pole 5 and outputting it as an electric signal, a yoke case 9 for accommodating a
part of the center pole 5 has a through hole 9b. To have. [Selected figure] Figure 1
Voice coil mounting method and speaker
[0001]
The present invention relates to a voice coil attachment method and a speaker. More specifically,
the present invention relates to a speaker that detects a capacitance formed between a voice coil
and a center pole and outputs the detected signal as an electrical signal, and a method of
attaching the voice coil in the speaker.
[0002]
A speaker equipped with an MFB (Mortional Feed Back) circuit is known as a technology for
improving the sound quality of the speaker. The MFB circuit detects an operating state of a
vibrating plate based on an electrical signal (also referred to as a voice signal) indicating audio
information input to a speaker, and performs feedback control of the diaphragm based on the
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detection result. This makes it possible to eliminate the distortion of sound that is particularly
likely to occur in the low tone range. Therefore, it is generally considered that the MFB circuit is
effectively employed in a small speaker which is considered to be difficult to reproduce in the
low frequency range.
[0003]
The MFB circuit detects the operating state of the diaphragm by detecting a change in
capacitance formed between the electrodes. Specifically, an electrode (hereinafter referred to as a
movable electrode) is fixed to a diaphragm or an electromagnetic coil called a voice coil for
vibrating the diaphragm, and the electrode (hereinafter referred to as the electrode) is opposed
to the movable electrode. The fixed electrode is fixed, and the electrostatic capacitance detected
by the movable electrode moving relative to the fixed electrode is detected by the detector, and
this is converted by the conversion circuit into an electrical signal (also called a detection signal).
Convert to) and output. Then, the detection signal and the audio signal are compared by a
comparison device (for example, a CPU), and the operation of the diaphragm is appropriately
made based on the comparison result, that is, the difference between the output level of the
detection signal and the output level of the audio signal. Control.
[0004]
As a conventional speaker which detects the change of the electrostatic capacitance formed
between a voice coil and a center pole as mentioned above, converts it into an electric signal, and
outputs it, for example, as shown in FIG. A magnetic circuit is formed by a yoke 104 with a
cylindrical pole 105 and a cylindrical center pole 103, and a cylindrical voice coil 101 in which a
coil 102 is wound is inserted into an annular gap 107 between the center pole 103 and the yoke
104. The voice coil 101 and the diaphragm 106 are connected to each other and supported by a
frame (not shown) to vibrate the diaphragm 106 to generate sound (Japanese Patent Application
Laid-Open No. 2001-147118).
[0005]
JP-A-53-12320
[0006]
In the attachment of the voice coil 101 in the conventional speaker as in Patent Document 1,
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usually, the voice coil 101 fitted in a jig is first inserted from the gap 107 to a predetermined
position and partially covered with the center pole 103. It is fixed in the
Then, after the voice coil 101 is connected to and supported by the diaphragm 106 in this state,
the jig is removed and the voice coil 101 is attached.
At this time, the inner peripheral surface of the voice coil 101 and the outer peripheral surface of
the center pole 103 should be attached without forming a gap of a fixed width without contact.
However, in the speaker of Patent Document 1, since the internal space of the yoke 104 is
covered by the yoke 104 and the magnet 105, the gap 107 is viewed from the side where the
voice coil 101 is inserted. There is no light leaking through the gap 107. Therefore, since the
boundary between the inner peripheral surface of the voice coil 101 and the boundary between
the outer peripheral surface of the center pole 103 can not be visually recognized, the peripheral
wall of the cylindrical voice coil 101 is positioned approximately at the center of the annular gap
107. There is a problem that it can not be easily checked whether the inner peripheral surface of
the coil 101 and the outer peripheral surface of the center pole 103 are properly attached
without coming in contact with each other. For this reason, in the conventional speaker structure,
it can not be said that appropriate quality control can be performed quickly.
[0007]
Moreover, in the speaker of Patent Document 1, the voice coil 101 and the center pole 103 can
not correct the mutual positional relationship once assembled. That is, even if the voice coil 101
is attached in contact with the center pole 103, there is a problem that the position of the voice
coil 101 can not be corrected after being attached once and the entire speaker becomes
defective. . For this reason, it is difficult to say that the conventional speaker structure can
efficiently produce a good product without waste.
[0008]
Also, although it is desirable for the gap 107 to be as small as possible in order to form a good
capacitance, in order to avoid the above-mentioned problem of contact with the center pole 103
when the voice coil 101 is attached, the gap 103 is required more In some cases, For this reason,
in the conventional speaker structure, it can not be said that the best performance can be
exhibited.
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[0009]
Therefore, an object of the present invention is to provide a voice coil attachment method and a
speaker that can easily confirm the positional relationship with the center pole at the time of
attachment of the voice coil. Another object of the present invention is to provide a voice coil
attachment method and a speaker that can correct the positional relationship between the voice
coil and the center pole even after the voice coil is attached.
[0010]
In order to achieve such an object, in the voice coil mounting method according to claim 1, the
voice coil mounting of the speaker for detecting the capacitance formed between the voice coil
and the center pole and outputting it as an electric signal. At the time, light is introduced into the
inner space of the yoke case from a through hole provided in the yoke case for housing at least a
part of the center pole, and the light introduced into the inner space of the yoke case is between
the voice coil and the center pole. I try to check the width of the gap.
[0011]
Therefore, according to this voice coil mounting method, the width of the gap between the voice
coil and the center pole is confirmed by the light introduced into the inner space of the yoke
case, and therefore, it is incorporated into the inner space of the yoke case. The light clearly
shows the boundary of the inner peripheral surface of the voice coil and the boundary of the
outer peripheral surface of the center pole, and confirms the width of the gap between the inner
peripheral surface of the voice coil and the outer peripheral surface of the center pole. It is
possible to easily check whether the two are properly attached without contact.
[0012]
Further, the invention according to claim 2 is the voice coil mounting method according to claim
1, wherein the frame supporting the voice coil is slid relative to the center pole so that the width
of the gap becomes constant. The positional relationship with the center pole is adjusted.
In this case, even if the voice coil is once attached with the inner peripheral surface of the voice
coil in contact with the outer peripheral surface of the center pole, the positional relationship
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between the two is corrected and the two are in a normal state without contact. A voice coil can
be attached.
[0013]
According to a third aspect of the present invention, there is provided a speaker for detecting a
capacitance formed between a voice coil and a center pole and outputting it as an electric signal,
wherein a yoke case for accommodating at least a part of the center pole is one. It is made to
have three or more through holes.
[0014]
Therefore, according to this speaker, since the yoke case accommodating at least a part of the
center pole has one or more through holes, light is introduced into the internal space of the yoke
case, and this light causes the voice coil to The boundary of the inner peripheral surface and the
boundary of the outer peripheral surface of the center pole can be clearly viewed, and the width
of the gap between the inner peripheral surface of the voice coil and the outer peripheral surface
of the center pole is confirmed and both contact It can be easily confirmed whether it is properly
installed without.
[0015]
Furthermore, in the speaker according to claim 4, in the speaker according to claim 3, either one
of the voice coil support member and the center pole support member has a diameter larger than
the outer diameter of the bolt connecting the support members. It is made to have a large bolt
hole.
In this case, either one of the voice coil support member and the center pole support member has
a bolt hole larger than the outer diameter of the bolt connecting the support members. Even if
the voice coil is attached once with the circumferential surface and the outer peripheral surface
of the center pole in contact, even if the positional relationship between the two is corrected, the
voice coil can be attached in a normal state without the two contacting.
[0016]
According to the voice coil attachment method and the speaker of the present invention, the light
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introduced into the inner space of the yoke case can clearly recognize the boundary of the inner
peripheral surface of the voice coil and the boundary of the outer peripheral surface of the center
pole Since the width of the gap between the inner peripheral surface of the voice coil and the
outer peripheral surface of the center pole can be confirmed to easily confirm whether or not the
two are properly attached without contact, it is appropriate. It will be possible to carry out
quality control quickly.
Also, even if the voice coil is once attached in a state where the inner circumferential surface of
the voice coil and the outer circumferential surface of the center pole are in contact, the
positional relationship between the two is corrected and the voice coil in a normal state without
contact. Since it can be mounted, it is possible to efficiently produce good products without
waste.
Furthermore, since the positional relationship between the voice coil and the center pole can be
appropriately adjusted, it is possible to reduce the gap between the two to the minimum
necessary, which makes it possible to exhibit the best performance. .
[0017]
Hereinafter, the configuration of the present invention will be described in detail based on the
best mode shown in the drawings.
[0018]
FIG. 1 shows an example of the embodiment of the speaker of the present invention.
The speaker 1 detects a capacitance formed between the voice coil 4 and the center pole 5 and
outputs it as an electric signal, and the yoke case 9 accommodating a part of the center pole 5
has a through hole. It is made to have 9b.
[0019]
The speaker 1 includes a damper 2, a diaphragm 3, a voice coil 4, a center pole 5, a magnet 7, a
yoke plate 8, and a yoke case 9.
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[0020]
The yoke case 9 is formed in a bowl shape having a circular cross section.
The yoke case 9 has a through hole 9b in the peripheral wall. There may be at least one through
hole 9b. If there is even one through hole 9b, light is introduced into the internal space of the
yoke case 9, and this light leaks from between the inner peripheral surface of the voice coil 4 and
the outer peripheral surface of the center pole 5, and the boundary between both peripheral
surfaces Will be clearly visible. Therefore, the number of through holes 9 b is not particularly
limited, but more light is taken into the inner space of yoke case 9 to form an annular shape
between the inner peripheral surface of voice coil 4 and the outer peripheral surface of center
pole 5. Since the positional relationship between the voice coil 4 and the center pole 5 can be
more easily confirmed if the boundary between the two circumferential surfaces can be more
clearly viewed over the entire circumference of the gap 6, it is preferable. It is two or more, more
preferably three or more, and most preferably four or more.
[0021]
The yoke plate 8 is formed in a disk shape having a through hole 8a at a central portion. The
yoke plate 8 is fixed to the end face of the yoke case 9 on the opening side in a state where the
through hole 8 a is positioned substantially at the center of the opening of the yoke case 9.
[0022]
The magnet 7 is formed in a disk shape having a constant thickness. Then, one surface of the
disk-shaped magnet 7 and the inner bottom surface 9a of the yoke case 9 are bonded, and the
magnet 7 is fixed to substantially the center of the inner bottom surface 9a.
[0023]
The center pole 5 is made of iron and has a columnar center pole body 5a, a band-like protrusion
5b formed around the outer peripheral surface of the center pole body 5a in the middle of the
center pole body 5a, and a base of the center pole body 5a. It is comprised from the flange 5c
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formed in the end. The end face on the flange 5c side of the center pole 5 is bonded to the
magnet 7 fixed to the inner bottom surface 9a of the yoke case 9, and the axis of the columnar
center pole body 5a is substantially perpendicular to the inner bottom surface 9a. The center
pole 5 is fixed in a state of being positioned approximately at the center of the inner bottom
surface 9a.
[0024]
Further, in the state where the end face of the center pole 5 on the side of the flange 5c on the
base end side is adhered to the magnet 7, the positions of the band-like protrusion 5b and the
through hole 8a of the yoke plate 8 substantially coincide with each other. The tip end portion of
the pole body 5a is formed and arranged so as to protrude from the through hole 8a to the
outside of the yoke case 9.
[0025]
The center pole 5 and the yoke case 9 are connected to a housing (not shown) called an
enclosure and grounded or grounded.
[0026]
The voice coil 4 is composed of a cylindrical bobbin 4a whose both ends are open and a coil 4b
wound in a band around the outer periphery of the bobbin 4a.
[0027]
The inner diameter of the bobbin 4a is slightly larger than the outer diameter of the band-shaped
protrusion 5b of the center pole 5, that is, an air gap is formed between the inner peripheral
surface of the bobbin 4a and the outer peripheral surface of the band-shaped protrusion 5b of
the center pole 5. The inner diameter is adjusted and formed to be
Then, it is inserted into the inside of the yoke case 9 from the through hole 8a of the yoke plate
8, and covers at least the band-like protrusion 5b to cover the center pole main body 5a.
[0028]
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The coil 4b is wound around the outer periphery of the bobbin 4a at a position facing the
through hole 8a of the yoke plate 8 in a state where the bobbin 4a is put on the center pole main
body 5a.
Specifically, for example, a conductor such as an enameled wire or a lead is used as the coil 4b.
[0029]
The through hole 8a of the yoke plate 8 is the air between the outer peripheral surface of the coil
4b wound around the outer periphery of the bobbin 4a and the inner peripheral surface of the
through hole 8a in a state where the bobbin 4a is covered with the center pole body 5a. The
diameter is adjusted to form a gap.
[0030]
The damper 2 and the diaphragm 3 are attached to the bobbin 4 a of the voice coil 4.
The damper 2 is a circular thin plate having a plurality of bent portions and a hole for allowing
the bobbin 4a to penetrate in the center, and the edge of the hole in the center is bonded to the
outer peripheral surface of the bobbin 4a with an adhesive. Are adhesively bonded to the frame
12.
The diaphragm 3 functions as a so-called cone paper, and is formed in a mortar shape having a
hole at the bottom for allowing the bobbin 4a to pass through, and the edge of the hole at the
bottom is bonded to the outer peripheral surface of the bobbin 4a with an adhesive. The outer
peripheral edge is joined to the frame 12 through the joint 13. The damper 2 and the diaphragm
3 are formed of a flexible material, and the voice coil 4 is supported so as to be capable of
vibrating in the axial direction of the cylindrical bobbin 4a.
[0031]
The frame 12 is formed in a mortar shape, and includes a bottom 12a, a peripheral wall 12b
inclined outward from the bottom 12a and having a step surface parallel to the bottom 12a, and
a bottom 12a formed along the tip peripheral edge of the peripheral wall 12b. It consists of
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parallel ridges 12c. A through hole whose diameter is larger than the diameter of the through
hole 8 a of the yoke plate 8 is provided substantially at the center of the bottom portion 12 a in
order to allow the bobbin 4 a of the voice coil 4 to penetrate. In the frame 12, the flange 12 c is
joined to a housing called the enclosure with a screw or an adhesive and is grounded.
[0032]
The frame 12 is attached to the yoke plate 8 by the bolt 10 and the support member 11 in a
state where the bottom 12a is in contact with the yoke plate 8 and the through hole 8a of the
yoke plate 8 is located substantially at the center of the through hole of the bottom 12a.
[0033]
For this purpose, the frame 12 has an overhanging portion 12d in which a stepped surface in the
middle of the peripheral wall 12b partially protrudes in parallel with the bottom 12a.
A through hole 12 e having a diameter larger than the outer diameter of the male screw of the
bolt 10 is provided in the overhang portion 12 d.
[0034]
The support member 11 is formed in a columnar shape, and a through hole 11 a for passing the
male screw portion of the bolt 10 is provided at a column-shaped axial center position. The inner
circumferential surface of the through hole 11a may be formed with a female screw for fitting
with the male screw of the bolt 10, or a slip adjusted to the outer diameter of the male screw so
as to simply pass through the male screw portion of the bolt 10. It is good also as a face. Further,
the support member 11 is formed in a length in which both end faces are in contact with each
other while being sandwiched between the overhanging portion 12 d and the yoke plate 8 in a
state where the frame 12 is installed on the yoke plate 8.
[0035]
At the peripheral portion of the yoke plate 8, bolt holes 8 b for fitting the bolts 10 are provided.
[0036]
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Then, the support member 11 is adhered and fixed to the peripheral portion of the yoke plate 8
in a state where the axis of the bolt hole 8b and the axis of the through hole 11a are in a straight
line.
Furthermore, the frame 12 is installed on the yoke plate 8 in a state where the positions of the
center of the through hole 12 e provided in the overhang portion 12 d and the axial center of the
through hole 11 a of the support member 11 substantially coincide. Then, the bolt 10 is inserted
from the through hole 12 e, passes through the through hole 11 a of the support member 11,
and is fitted into the bolt hole 8 b of the yoke plate 8. Thus, the frame 12 is attached to the yoke
plate 8.
[0037]
In addition, the number of installation places of the overhanging part 12 d of the frame 12, the
number of the supporting members 11 corresponding to the number of places, and the number
of places of the through holes 8 b of the yoke plate 8 are to stably attach the frame 12 to the
yoke plate 8 It is not particularly limited as long as the number and the number of places where
it can occur is not particularly limited, and is preferably 2 or more, more preferably 3 or more,
and most preferably 4 or more. In the present embodiment, three overhangs 12 d are provided at
equal intervals along the peripheral wall 12 b of the frame 12, three through holes 8 b are
provided corresponding to the overhangs 12 d, and three support members 11 are used. Be
[0038]
The opening 4 c opposite to the yoke case 9 of the bobbin 4 a of the voice coil 4 is covered by
the center cap 14. The center cap 14 is made of aluminum or the like, and includes a domeshaped main body portion 14 a and a collar portion 14 b formed along the outer peripheral edge
of the main body portion 14 a. The center cap 14 is fixed to the diaphragm 3 by bonding the
flange portion 14 b with an adhesive.
[0039]
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According to the speaker 1 configured as described above, an audio signal is input to the voice
coil 4, that is, a current indicating the audio signal flows through the coil 4b of the voice coil 4,
and this current, the center pole 5, the magnet 7, and the current The voice coil 4 vibrates in the
axial direction of the cylindrical bobbin 4 a by the excitation action of the magnetic flux formed
between the yoke case 9 and the yoke plate 8. Along with this, the damper 2 and the diaphragm
3 vibrate and sound is emitted from the speaker 1.
[0040]
The procedure of assembling the above-described speaker 1 will be described below.
[0041]
First, the magnet 7 is bonded and fixed substantially at the center of the inner bottom surface 9 a
of the yoke case 9.
Further, the center pole 5 is bonded and fixed to the magnet 7. Then, the yoke plate 8 is bonded
and fixed to the end face on the opening side of the yoke case 9 in a state where the center pole
main body 5a is positioned substantially at the center of the through hole 8b.
[0042]
Further, the outer peripheral edge portion of the damper 2 is bonded to the frame 12 with an
adhesive, and the outer peripheral edge portion of the diaphragm 3 is bonded to the frame 12 via
the joint 13. Then, the positions of the center of the through hole 12 e provided in the overhang
portion 12 d of the frame 12 and the axial center of the through hole 11 a of the support
member 11 are matched, and the frame 12 is attached to the yoke plate 8 by the bolt 10.
Subsequently, in a state where the voice coil 4 is inserted from the through hole 8a of the yoke
plate 8 to a predetermined position using a jig and fixed, the edge of the central hole of the
damper 2 and the diaphragm 3 is the outer periphery of the bobbin 4a Glue to the surface with
an adhesive.
[0043]
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Further, according to the speaker 1 of the present invention, the gap between the inner
peripheral surface of the voice coil 4 and the center pole 5 forming the gap 6 by the light
introduced from the through hole 9 b of the yoke case 9 to the internal space of the yoke case 9.
The boundary of the outer peripheral surface can be clearly viewed, and the width of the gap 6
can be easily confirmed. Thereby, the positional relationship between the voice coil 4 and the
center pole main body 5a supported and attached by the damper 2 and the diaphragm 3 can be
confirmed by the above-described procedure. Specifically, with the frame 12 supporting the voice
coil 4 attached to the yoke plate 8, when the gap 6 is viewed from the opening 4c side of the
voice coil 4, the boundary of the inner circumferential surface of the voice coil 4 When the
distance from the boundary of the outer peripheral surface of the center pole 5 is substantially
constant, that is, when the annular gap 6 is formed with a substantially constant width without
extremely narrowing or breaking on the way, the voice coil 4 can be determined to be attached at
an appropriate position. On the other hand, when the gap 6 is partially narrowed or interrupted
when the gap 6 is viewed, it can be determined that the attachment position of the voice coil 4 is
defective.
[0044]
Further, according to the speaker 1 of the present invention, since the diameter of the through
hole 12e provided in the projecting portion 12d of the frame 12 is formed larger than the outer
diameter of the male screw of the bolt 10, the frame 12 is formed by the above procedure. Once
the frame 12 is attached to the yoke plate 8, the frame 12 can be slid relative to the yoke plate 8
by loosening the bolt 10. Therefore, if it is determined that the mounting position of voice coil 4
is defective after frame 12 supporting voice coil 4 is attached to yoke plate 8, bolt 10 is loosened
and frame 12 is made relative to yoke plate 8. By adjusting the position of the voice coil 4 by
sliding it and retightening the bolt 10, the position of the voice coil 4 which has been defective
can be corrected to an appropriate position.
[0045]
Then, position confirmation or position adjustment of the voice coil 4 is performed to determine
the attachment position of the frame 12, and after the attachment work of the voice coil 4 and
the frame 12 is completed, the flange portion 14b is joined to the diaphragm 3 with an adhesive.
Attach the center cap 14.
[0046]
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The above-described embodiment is an example of the preferred embodiment of the present
invention, but is not limited to this, and various modifications can be made without departing
from the scope of the present invention.
For example, in the present embodiment, the through hole 9b is provided on the peripheral wall
of the yoke case 9, but if light can be taken into the internal space of the yoke case 9, the
installation position of the through hole 9b is limited to this. Instead, they may be provided on
the bottom plate of the yoke case 9.
[0047]
Further, in the present embodiment, the frame 12 is slid even in a state of being attached to the
yoke plate 8 by making the diameter of the through hole 12e provided in the overhang portion
12d of the frame 12 larger than the outer diameter of the male screw of the bolt 10. However,
the mounting method of the frame 12 by the bolt 10 which makes it possible to slide the frame
12 relative to the yoke plate 8 is not limited to this. The frame 12 may be slid by making the
diameter larger than the outer diameter of the male screw of the bolt 10. Specifically, the support
member 11 is adhered and fixed to the overhanging portion 12 d of the frame 12, and the
diameters of the through holes 12 e and the through holes 11 a are matched with the outer
diameter of the male screw of the bolt 10. On the other hand, the diameter of the through hole 8
b is made larger than the outer diameter of the male screw of the bolt 10. Then, the bolt 10
penetrates the through hole 12e, the through hole 11a, and the through hole 8b and protrudes
from the through hole 8b, and a nut is fitted on the male screw of the protruded bolt 10.
Thereby, the frame 12 may be slid by attaching the frame 12 to the yoke plate 8 and loosening
the nut.
[0048]
Further, in the speaker 1 of the present embodiment, the space surrounded by the damper 2, the
frame 12, the yoke plate 8 and the yoke case 9 is for the vibration of the voice coil 4 together
with the voice coil 4, the diaphragm 3 and the center cap 14. Function as an air damper.
Therefore, depending on the number and the diameter of the through holes 9b of the yoke case
9, the air damper effect may be reduced to an inappropriate level. In such a case, the position of
the voice coil 4 may be confirmed or adjusted to fix the mounting position of the frame 12 and
the through hole 9b may be closed after the mounting operation is completed. In this case,
specifically, for example, a method of sticking and closing a tape or fitting and closing a resin cap
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may be considered.
[0049]
Furthermore, the present invention is applicable to a speaker having any configuration as long as
it is a speaker that detects an electrostatic capacitance formed between a voice coil and a center
pole and outputs it as an electric signal. The configuration of the speaker of the invention is not
limited to the configuration of the speaker 1 of this embodiment.
[0050]
It is a longitudinal cross-sectional view which shows an example of embodiment of the speaker of
this invention.
It is a longitudinal cross-sectional view which shows the conventional speaker.
Explanation of sign
[0051]
1 Speaker 4 voice coil 5 center pole 9 yoke case 9b through hole
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