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JPH07250400

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH07250400
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device, and is particularly suitable for a speaker device using an electrostatic speaker.
[0002]
2. Description of the Related Art In an electrostatic speaker, a sound pressure corresponding to a
drive signal can be generated by applying a polarization voltage separately to the drive signal.
That is, as shown in FIG. 18, in the speaker device 1 using an electrostatic speaker, the drive
signal output from the power amplifier 2 is boosted several tens of times by the step-up
transformer 3, and the output signal of the step-up transformer 3 is Output to the speaker
element 4.
[0003]
Here, fixed electrodes 5 and 6 in which a plurality of penetrating terms are formed in a metal
plate are provided in the speaker element 4, and an output signal of the step-up transformer 3 is
applied between the fixed electrodes 5 and 6. Become. Furthermore, in the speaker element 4, for
example, a conductive thin film is applied to a polyester film to form a vibrating film 7, which is
held between the fixed electrodes 5 and 6.
04-05-2019
1
[0004]
The loudspeaker device 1 boosts the commercial power supply with the power supply for
forming the polarization voltage to the diaphragm 7 to form a polarization voltage of several kV,
and this polarization voltage is used as the secondary side middle of the step-up transformer 3.
Applied between the tap and the vibrating membrane 7. At this time, the polarization voltage
forming power source 8 applies a polarization voltage to the diaphragm 7 through the resistor 9
having a predetermined resistance value, thereby setting the Q of the speaker device 1 as a
whole to a predetermined value.
[0005]
As a result, in the speaker device 1, the driving force F represented by is formed in the vibrating
film 7, and by causing the vibrating film 7 to elastically vibrate by the driving force F, a sound
pressure corresponding to the driving signal can be generated. It is done. Here, ε represents a
dielectric constant, and in this case, the value is 8.85 × 10 -12 [F / N], S is an electrode area [m
2], E 0 and E are a polarization voltage [V] and a drive signal, respectively. It is a voltage [V]. Also,
d0 is the distance between electrodes [m].
[0006]
By the way, in such an electrostatic type speaker, high accuracy is required as the accuracy of the
clearance (C in the figure) of the fixed electrodes 5 and 6 and the vibrating film 7, but Accuracy
maintenance is not easy. In particular, coating is performed on the fixed electrodes 5 and 6 in
order to withstand pressure and the like. However, the occurrence of uneven thickness in the
coating can not be avoided, which makes it difficult to maintain the clearance C with high
accuracy. Thus, there is a problem that this type of loudspeaker is very difficult to mass-produce
by the so-called line process because the requirement for the clearance accuracy is high and it is
difficult to maintain the accuracy.
[0007]
SUMMARY OF THE INVENTION In view of such problems, the present invention has an object of
maintaining the clearance between a fixed electrode and a vibrating body with high accuracy in
an electrostatic speaker and enabling mass production. Do.
04-05-2019
2
[0008]
For this purpose, a drive signal is applied between a pair of fixed electrodes held opposite to each
other, and a polarization voltage is applied between an electrode of the vibrator held between the
fixed electrodes and the fixed electrode. In a speaker device that generates sound pressure
according to a drive signal, the vibrator is configured to be disposed between the respective fixed
electrodes in a state of being sandwiched by the spacers disposed on the respective fixed
electrodes.
[0009]
Further, in this case, each fixed electrode is attached to the pair of frame bodies, and the frame of
the vibrator is disposed between the pair of frame bodies via the elastic body.
Also, the spacer is bonded to the fixed electrode, and the spacer is also bonded to the vibrator.
[0010]
Further, each fixed electrode is attached to a pair of frame bodies, and one or both of the pair of
frames form a tapered surface as a surface to be in contact with the other frame. The end portion
serves as a fulcrum to apply a sandwiching force to the sandwiching portion of the fixed
electrode and the spacer.
[0011]
The clearance between the fixed electrode and the vibrator is determined only by the spacer by
holding the vibrator in a directly sandwiched state by the spacer disposed on the fixed electrode.
The effect of uneven thickness due to the coating of the fixed electrode does not appear on the
clearance accuracy.
[0012]
In addition, since the vibrating body is directly pressed by the spacer, the positional accuracy
with respect to the frame of the vibrating body is free, but by arranging the vibrating body in the
frame via the elastic body, The rattling of the frame can be suppressed.
04-05-2019
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[0013]
Further, by bonding the spacer to the fixed electrode with, for example, an ultrathin double-sided
tape, the workability as the assembly process of the speaker is improved.
Furthermore, by bonding the spacer to the vibrating body with, for example, an extremely thin
double-sided tape, it is possible to prevent the vibrating body from being wrinkled due to thermal
expansion.
[0014]
In addition, a fixed surface is provided by providing a tapered surface on the frame, and the end
of the tapered surface serving as a fulcrum at the time of joining a pair of frames so that a
sandwiching force is structurally applied to the sandwiching portion of the stationary electrode
and the spacer. The spacer and the vibrating body are more reliably press-fixed and the accuracy
of the clearance between the fixed electrode and the vibrating body determined by the spacer is
further improved.
[0015]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a
loudspeaker apparatus according to the present invention will be described below with reference
to FIGS. 1 to 13 and a second embodiment of the present invention will be described with
reference to FIGS.
[0016]
First, as a first embodiment, FIG. 1 is a perspective view of a speaker element of the electrostatic
speaker device of the embodiment, and FIG. 2 is an exploded perspective view of the speaker
element.
In these drawings, reference numeral 10 denotes the entire speaker element, and reference
numerals 20 and 30 denote a pair of frames serving as a housing of the speaker element.
Further, 40A and 40B denote a pair of fixed electrodes, 50A and 50B denote spacers
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4
corresponding to the respective fixed electrodes 40A and 40B, 60 denotes an elastic body, 70
denotes a metal frame to which a vibrating film 90 is attached, and 80 denotes a vibrating
electrode .
[0017]
Each component shown in FIG. 2 is joined by a screw N or the like to form a speaker element 10
as shown in FIG.
The screw N1 is, for example, a hex socket head screw, through which the elastic body 60, the
metal frame 70 and the vibrator electrode 80 are inserted between the frame 20 and the frame
30, and the frame 20, the frame 30, the elastic body 60, Screw holes (21, 31, 61, 71, 81) are
provided at corresponding six positions in the vibrating body electrode 80 and the metal frame
70, respectively.
[0018]
The screw N2 is for joining the frame 20 and the frame 30, and screw holes 22 and 32 are
formed at four corresponding positions in the frame 20 and the frame 30, respectively.
If each component is sufficiently fixed by the above-mentioned screw N1, this screw N2 is not
necessarily required, and in that case, naturally, the screw holes 22 and 32 need to be formed in
the frame 20 and the frame 30 Absent.
It is preferable not to use the screw N2 from the viewpoint of mass production and cost
reduction of the electrostatic speaker device.
[0019]
A plan view, a right side view, a left side view, a front view, a bottom view, an AA sectional view,
and a BB sectional view of the frame 20 are shown in FIGS. The frame 20 is formed as a framelike shape in which the sound pressure output hole 23 is formed at the center of the plane.
04-05-2019
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[0020]
Then, a step is formed around the bottom side of the sound pressure output hole 23, as can be
seen from FIGS. 3 (e), (f) and (g), and the step is a fixed electrode on which the fixed electrode
40A is disposed. The placement unit 24 is used. Further, a circumferential groove portion 26 is
formed on the peripheral side of the wall portion 25 which is the periphery of the fixed electrode
placement portion 24. The depth of the step from the wall 25 to the fixed electrode placement
portion 24 is equal to or shorter than the thickness of the fixed electrode 40A, and when the
fixed electrode 40A is placed in the fixed electrode placement portion 24, the wall The upper
plane of the portion 25 is set so as not to be higher than the plane of the fixed electrode 40A.
[0021]
Reference numeral 27 denotes a lead-out portion for leading the lead wire connected to the fixed
electrode 40A when the fixed electrode 40A is disposed, and 28 denotes a lead-out portion for
leading the lead wire of the vibrator electrode 80. Further, as seen in FIG. 3 (e) and FIG. 2, a
notch receiver 29 is provided on the bottom surface side of the frame 20 so as to project from
the side surface side to the groove 26 portion. The notch receiver 29 functions as a positioning
mechanism when the elastic body 60, the metal frame 70, and the vibrator electrode 80 are
disposed as described later.
[0022]
Next, the top view, the right side view, the left side view, the front view, the bottom view, the C-C
cross-sectional view, and the D-D cross-sectional view of the frame 30 are shown in FIGS. The
frame 30 is also formed in a frame-like shape in which the sound pressure output hole 33 is
formed at the center of the plane.
[0023]
Then, a step is formed around the bottom side of the sound pressure output hole 33, as can be
seen from FIGS. 4 (e) (f) (g), and this step is a fixed electrode on which the fixed electrode 40B is
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disposed. The placement unit 34 is used. Reference numeral 35 denotes a wall which is the
periphery of the fixed electrode placement portion 34. The depth of the step from the wall
portion 35 to the fixed electrode placement portion 34 is equal to or shorter than the thickness
of the fixed electrode 40B, and when the fixed electrode 40B is disposed in the fixed electrode
placement portion 34, the wall portion 35 is formed. It is set so that it does not become higher
than the plane of fixed electrode 40B.
[0024]
Reference numeral 37 denotes a lead-out portion for leading out the lead wire connected to the
fixed electrode 40B when the fixed electrode 40B is disposed.
[0025]
Next, the top view, front view, and EE sectional drawing of the metal frame 70 to which the
vibrating membrane 90 was stuck are shown to FIG. 5 (a)-(c).
The planar shape and size of the metal frame 70 are set to a shape and size that can be inserted
into the circumferential groove 26 in the frame 20.
[0026]
Then, on the upper surface side of the metal frame 70, for example, a vibrating film 90 formed
by applying a conductive thin film to a polyester film is attached. Reference numeral 78 denotes
a notch for escaping the notch receiver 29 formed in the frame 20.
[0027]
The top view and front view of the elastic body 60 are shown to Fig.6 (a) (b). The elastic body 60
is made of, for example, a foamable resin, and its planar shape and size are substantially the
same as those of the metal frame 70, that is, it can be fitted into the circumferential groove 26 in
the frame 20. Further, a notch 62 for escaping the notch receiver 29 formed in the frame 20 is
formed.
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[0028]
FIGS. 7A and 7B show a plan view and a front view of the vibrator electrode 80. FIG. The planar
shape and size of the vibrator electrode 80 are also substantially the same as those of the metal
frame 70, that is, it can be fitted into the circumferential groove 26 in the frame 20. And when it
inserts in the groove part 26, the notch part 84 is formed in order to escape with respect to the
notch receptacle 29 formed in the flame | frame 20. As shown in FIG. Also, a sideward projecting
portion 83 is provided, and the lead wire LS is connected to this projecting portion. The lead wire
LS is a lead wire for applying the polarization voltage from the polarization voltage forming
power source in FIG. 18 to the diaphragm 90.
[0029]
FIGS. 8A and 8B show a plan view and a front view of the spacer 50A (50B). The spacer 50A
(50B) is formed of, for example, a film-like resin or the like into a circumferential shape as shown
in FIG. The outer peripheral size is substantially the same as the outer peripheral size of the walls
25 and 35 in the frames 20 and 30, and the inner peripheral size is smaller than the outer
peripheral size of the fixed electrode.
[0030]
A plan view and a front view of the fixed electrode 40A (40B) are shown in FIGS. 9 (a) and 9 (b).
The fixed electrode 40A (40B) is formed, for example, as a flat copper material in which a large
number of through holes 41 are opened. A lead wire connecting portion 42 is connected to the
lead wire LK for supplying the output of the step-up transformer 3 in FIG.
[0031]
Each of these components will be mounted within the frame 20, 30 as described below. First, the
fixed electrode 40A is attached onto the fixed electrode placement portion 24 of the frame 20
shown in FIG. That is, the peripheral portion of the fixed electrode 40A is placed on the fixed
electrode placement portion 24. At this time, the lead wire connecting portion 42 of the fixed
electrode 40A is fitted into the lead-out portion 27, and the lead wire LK is led out of the frame
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20. And fixed electrode 40A by which a peripheral part was laid on fixed electrode arrangement
part 24 will be exposed from sound pressure output hole 23 except the peripheral part. The
perspective view seen from the inside of the flame | frame 20 which attached the fixed electrode
40A is shown in FIG.
[0032]
Further, as can be seen from FIG. 10, the elastic body 60 is inserted into the groove 26 of the
frame 20. At this time, the notch portion 62 of the elastic body 60 corresponds to the notch
receiver 29 projecting in the groove portion 26 of the frame 20, whereby the elastic body 60 is
fitted and arranged in a state of being positioned.
[0033]
Then, the spacer 50A is adhered to the fixed electrode 40A attached to the frame 20 as shown in
FIG. For example, an extremely thin double-sided tape is used for this bonding. The extremely
thin double-sided tape is prepared, for example, by providing a release layer 101 to the adhesive
layer 100 as shown in FIG. 11, and by peeling off the release layer 101, both surfaces can be
used as an adhesive tape. . In this case, the thickness of the adhesive layer 100 is preferably
about 25 μm, and as such a double-sided tape, for example, “Sony Bond Film T4100”
manufactured by Sony Chemical Co., Ltd. is used.
[0034]
Such a double-sided tape is attached to one surface of the spacer 50A, and adhesively fixed from
the wall 25 of the frame 20 in FIG. 10 to the periphery of the fixed electrode 40A. That is, as
shown in FIG. 12C, the spacer 50A is bonded and fixed onto the fixed electrode 40A (and the wall
25).
[0035]
Further, as can be seen from FIG. 12C, the metal frame 70 with the vibrating film 90 attached to
the groove 26 of the frame 20 is inserted from the side to which the vibrating film 90 is not
04-05-2019
9
attached. That is, the metal frame 70 is placed on the elastic body 60 in FIG. At this time, the
position of the notch 78 of the metal frame 70 is made to correspond to the notch receiver 29 of
the frame 20, and the arrangement direction and position are determined. In the state shown in
FIG. 12C, the vibrating membrane 90 is disposed on the uppermost surface inside the frame 20.
[0036]
At this time, the spacer 50A does not face the portion of the metal frame 70, but abuts on the
vibration surface peripheral edge portion (portion in the frame of the metal frame 70) of the
vibrating membrane 90. The above-mentioned double-sided tape is used and adhered to the
vibrating membrane 90 as well.
[0037]
Further, the vibrator electrode 80 of FIG. 12B is placed on the metal frame 70 from the upper
side in the drawing with respect to FIG. 12C.
The positioning of the metal frame 70 is also made by the correspondence between the notches
84 and the notches 29 of the frame 20. When the vibrating body electrode 80 is disposed, the
vibrating body electrode 80 is in contact with the peripheral portion of the vibrating membrane
90 because the metal frame 70 has the upper surface to which the vibrating membrane 90 is
attached. . At this time, the projecting portion 83 of the vibrator electrode 80 is derived from the
lead-out portion 28 of the frame 20.
[0038]
Further, the frame 30 to which the fixed electrode 40B and the spacer 50B of FIG. 12 (a) are
attached is covered and fixed from the upper side in the drawing, whereby the speaker element
10 as shown in FIG. 1 is configured. Ru. The attachment of the fixed electrode 40B and the
spacer 50B to the frame 30 is substantially the same as the attachment of the fixed electrode
40A and the spacer 50A to the frame 20, and the fixed electrode 40B is disposed on the fixed
electrode placement portion 34 of the frame 30. The lead wire connecting portion 42 of the fixed
electrode 40 B is fitted into the lead-out portion 37 and the lead wire LK is led out of the frame
30.
04-05-2019
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[0039]
Then, the fixed electrode 40B whose peripheral edge portion is placed on the fixed electrode
placement portion 34 is exposed from the sound pressure output hole 33 as seen in FIG. 12A,
except for the peripheral edge portion. The spacer 50B is also adhered and fixed to the upper
surface (and the upper surface of the wall portion 35) of the fixed electrode 40B attached to the
frame 30 by the double-sided adhesive tape.
[0040]
Furthermore, when the frame 30 to which the fixed electrode 40B and the spacer 50B are
attached is brought into contact with the vibrator electrode 80, the spacer 50B does not face the
portion of the vibrator electrode 80, and the frame of the vibrator electrode 80 It passes through
the inside and contacts the peripheral edge portion of the vibrating surface of the vibrating
membrane 90 (the inner portion of the metal frame 70). The double-sided tape described above
is also used and adhered between the spacer 50B and the vibrating membrane 90 at this time.
[0041]
A cross-sectional view of the speaker element 10 assembled in this manner is shown in FIG. 13
(a), and a portion showing the holding portion of the vibrating membrane 90 is enlarged and
shown in FIG. 13 (b). As clearly shown in FIGS. 13 (a) and 13 (b), the vibrating membrane 90 is
fixed and held in a sandwiched state by the spacers 50A and 50B attached on the fixed
electrodes 40A and 40B. Therefore, the clearance C between the vibrating membrane 90 and the
fixed electrodes 40A and 40B is determined to the last by the thickness of the spacer 50A
(including the thickness of the double-sided tape for bonding), which corresponds to the fixed
electrode 40A, Even if the coating thickness unevenness occurs in 40B, the clearance C will not
be affected. In addition, since the fixed electrodes 40A and 40B and the vibrating membrane 90
are pressure-contacted and defined in position through only the spacer, the mounting error of
the metal frame 70 and the vibrating body electrode 80 in the frames 20 and 30, etc. It does not
affect
[0042]
And since the clearance C is naturally set with high accuracy by the spacers 50A and 50B in this
way, there is no problem at all even if mass production is performed by a so-called line process.
04-05-2019
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[0043]
Furthermore, in the configuration of this embodiment, the position of the vibrating film 90 is first
determined by the fixed electrodes 40A and 40B and the spacers 50A and 50B, and the accuracy
of the clearance C is maintained. The position of the body (metal frame 70 and vibrator electrode
80) does not have to be fixed with high accuracy.
However, the metal frame 70 and the vibrator electrode 80 may be rattled only by appropriately
inserting the metal frame 70 and the vibrator electrode 80 in the groove portion 26 of the frame
20. However, in the present embodiment, the elastic body in the groove portion 26 Since 60 is
disposed, rattling of the metal frame 70 and the vibrator electrode 80 is also prevented.
[0044]
Further, in the present embodiment, the spacers 50A, 50B are adhered to the fixed electrodes
40A, 40B with a double-sided tape, but by adhering in this manner, the assembling process
becomes easy, It is suitable for mass production. Furthermore, although the spacers 50A and 50B
are adhered to the vibrating membrane 90 with a double-sided tape, it is possible to prevent the
vibrating membrane 90 from being wrinkled due to the influence of thermal expansion, and as
the speaker element 10 Can also be realized.
[0045]
Further, the directionality and positioning of the elastic body 60, the metal frame 70, and the
vibrator electrode 80 in the frames 20 and 30 are made by corresponding the notches 62, 78
and 84 and the notch receiver 29. By doing so, assembly work and part direction control can be
facilitated in the mass production process.
[0046]
Next, a second embodiment of the present invention will be described.
04-05-2019
12
FIG. 14 and FIG. 15 are a perspective view and an exploded perspective view of the speaker
element of the electrostatic speaker device according to the second embodiment. The speaker
element 10 has substantially the same configuration as that of the first embodiment, but only the
screw N1 is used as a means for joining the frames 20 and 30, and the screw N2 (screw at the
outermost portion of the frame) is never used. Also according to this, the screw holes 22 and 32
as in the first embodiment are not formed in the frame 20 and the frame 30.
[0047]
Also, as shown as 20TP in FIG. 15 and FIG. 16 showing the frame 20, two of the surfaces on the
inside of the frame 20 that come into contact with the frame 30 have tapered surfaces with very
slight inclination. Is formed. FIG. 17 (b) is an enlarged view of the tapered surface 20TP so that
the inclined state can be seen, but the inclination angle θ is, for example, about 1 °, and the
outer end side is raised.
[0048]
The other frame 30 has no tapered surface, and is similar to the frame 30 of the first
embodiment except that the screw holes 32 are not formed. The other parts are also the same as
in the first embodiment, and thus the description thereof is omitted.
[0049]
Also in this embodiment, the metal frame 70 to which the fixed electrodes 40A and 40B, the
spacers 50A and 50B, the elastic body 60, the vibrating body electrode 80 and the vibrating
membrane 90 are attached between the frames 20 and 30 corresponds to the first embodiment.
And the tapered surface 20TP is formed on the frame 20, and the bonding position by the screw
N1 is as shown by an arrow in FIG. The screw N1 is screwed when the frame 20 and the frame
30 are joined with the screw N1 because the tapered surface 20TP is located approximately at
the intermediate position between the contact portions of the frames and the inner peripheral
surfaces of the frames 20 and 30. The tapered surface 20TP is gradually brought into contact
with the frame 30 from the outer end to the inner end as it is fitted, and at this time the spacer
arrangement portion of the frame 20 (fixed electrode arrangement 24 and the wall portion 25)
will be strongly pressed by the direction of the spacer arrangement region of the frame 30 (fixed
electrode arrangement portion 34 and the wall 35).
04-05-2019
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[0050]
That is, the joint portion by the screw N1 is the force point, and the end of the tapered surface
20TP is the fulcrum, and the wall portion 25 in contact with the frame 20 and the inner
peripheral surface side of the frame 30, ie, the spacers 50A, 50B and the fixed electrodes 40A,
40B, 35, a more reliable sandwiching force can be obtained in the fixed electrode placement
portions 24, 34.
[0051]
Thus, structurally, the frame 20 and the frame 30 are more reliably sandwiched by the fixed
electrodes 40A and 40B and the spacers 50A and 50B (and the vibrating film 90 sandwiched by
the spacers 50A and 50B). The clearance C between the fixed electrodes 40A and 40B and the
vibrating membrane 90 is set more accurately depending on the thickness of the spacers 50A
and 50B.
This makes it easier to maintain the accuracy of the clearance C in, for example, a mass
production process.
In particular, even if the thickness unevenness of the fixed electrodes 40A and 40B and the
dimensional accuracy of the frames 30 and 40 are somewhat deteriorated by increasing the
sandwiching force on the inner peripheral side of the frames 30 and 40 in this manner, the cover
Clearance accuracy can be maintained. As a modification of this embodiment, a structure in
which a tapered surface is provided on the side of the frame 30 or a structure in which a tapered
surface is provided on both the frames 20 and 30 can be considered.
[0052]
Needless to say, the present invention is not limited to the first and second embodiments, and
various modifications can be considered within the scope of the invention.
[0053]
As described above, the speaker device of the present invention is configured to be held in a state
in which the vibrating body is directly sandwiched by the spacer disposed on the fixed electrode,
so the clearance between the fixed electrode and the vibrating body Will be determined only by
04-05-2019
14
the spacer, which makes clearance accuracy control very easy.
For this reason, there is an effect that it becomes suitable for mass production by a line process,
and efficiency improvement and cost reduction of a manufacturing process are also promoted.
[0054]
In addition, since the vibrating body is directly pressed by the spacer, the positional accuracy
with respect to the frame of the vibrating body is free, but the frame can be arranged by
arranging it in the frame via the elastic body here. I can suppress the rattling of the body.
[0055]
Furthermore, by bonding the spacer to the fixed electrode with, for example, an ultrathin doublesided tape, the workability as an assembly process of the speaker is improved, and furthermore,
the spacer has an ultrathin both surface, for example, to the vibrator. By bonding with a tape or
the like, it is possible to prevent generation of wrinkles in the vibrator due to thermal expansion.
[0056]
Also, with one or both of the frames, the surface in contact with the other frame is a tapered
surface, and the end of the tapered surface serves as a fulcrum when joining a pair of frames, and
structurally in the sandwiching portion of fixed electrode and spacer By applying the clamping
force, the fixed electrode, the spacer, and the vibrating body can be more securely press-fixed,
that is, the accuracy of the clearance between the fixed electrode and the vibrating body
determined by the spacer can be further improved. There is an effect that it becomes easier to
maintain the clearance accuracy in the mass production process.
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