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DESCRIPTION JP2015073203

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DESCRIPTION JP2015073203
An electrostatic electroacoustic transducer is provided that can obtain a stable tension without
bending the diaphragm when the diaphragm having an oval shape is held by a holding member.
A microphone unit (10) has a diaphragm (11) stretched on a diaphragm ring (12) formed in an
oval shape and a fixed electrode plate, and a support frame (20) is provided on the major axis
side of the diaphragm ring (12). The opposing arc-shaped frame parts 12b, 12b are pressed by
the correction means 21 by the screw members 21a, 21a, and the long side frame parts 12a, 12a
opposed on the short axis side are deformed to prevent the diaphragm 11 from bending. Adjust
the tension. [Selected figure] Figure 1
Electrostatic transducer and method of manufacturing the same
[0001]
The present invention relates to an electrostatic electroacoustic transducer and a method of
manufacturing the same, and in particular, in a condenser microphone and a headphone utilizing
change in capacitance between a diaphragm and a fixed electrode plate, the diaphragm is held.
The present invention relates to an electrostatic electroacoustic transducer that can be attached
to a member without bending and a method of manufacturing the same.
[0002]
2. Description of the Related Art In recent years, electronic devices including mobile phones have
been miniaturized, and their internal spaces have been narrowed.
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Many of the small-sized electronic devices incorporate electrostatic electroacoustic transducers
such as condenser microphones and condenser speakers, and miniaturization of the microphone
unit and the speaker unit is also inevitably required. However, in the electrostatic electroacoustic
transducer, the shape of the diaphragm disposed opposite to the fixed electrode plate is generally
designed to be circular, and the horizontal or vertical cross section in the electronic device is
rectangular. Not using space efficiently.
[0003]
In order to address such problems, Patent Document 1 describes a small-sized electronic device
as described above in the variable capacitance microphone, for example, by making the planar
shape of the microphone unit including the diaphragm into an oval shape (track field track
shape). The efficient use of the internal space of the According to the configuration of the
microphone disclosed in Patent Document 1, since the horizontal cross section of the microphone
unit can be made larger than in the case of the conventional circular shape, the internal space of
the internal space of a small electronic product such as a mobile phone can be obtained. Since
the effective area of the diaphragm is increased, the effect of increasing the sensitivity can be
obtained.
[0004]
JP 2005-86831 A
[0005]
By the way, as also described in Patent Document 1, in the microphone unit, the diaphragm is
adhered to and held by the frame-like holding member (diaphragm plate).
However, when the diaphragm is formed into an oval shape, the long side (opposite on the short
axis side) of the holding member which is formed into an oval shape in accordance with the
diaphragm is deformed toward the diaphragm by the tension of the diaphragm. The diaphragm
bends between the sides and the tension decreases. Therefore, there is a problem that it is
difficult to manufacture in a state where the tension of the diaphragm is stable.
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2
[0006]
The present invention has been made focusing on the above-mentioned points, and in the
electrostatic electroacoustic transducer, when holding the oblong diaphragm by the holding
member, the diaphragm is stable without bending. It is an object of the present invention to
provide an electrostatic electroacoustic transducer capable of obtaining tension and a method of
manufacturing the same.
[0007]
In order to solve the problems described above, an electrostatic electroacoustic transducer
according to the present invention comprises a fixed electrode plate, a diaphragm disposed
opposite to the fixed electrode plate, and a frame for holding the periphery of the diaphragm. In
the electrostatic electroacoustic transducer, the diaphragm and the diaphragm holding member
are formed in an oval shape, and the major axis side of the oval circular diaphragm holding
member is formed. The apparatus is characterized in that it has correction means for pressing
both ends inward from the outside and deforming so as to open a pair of long sides facing each
other on the short axis side of the diaphragm holding member.
The correction means is provided with a support frame disposed so as to surround the periphery
of the diaphragm holding member, and a projection from the side of the support frame toward
both ends on the long axis side of the diaphragm holding member. It is desirable to have a
pressing member for pressing the both ends on the long axis side in the inward direction.
Further, it is preferable that the pressing member is a screw screwed to the support frame so as
to be able to advance and retract with respect to both end portions on the long axis side of the
diaphragm holding member.
[0008]
According to such a configuration, when the diaphragm formed in an oval shape is held by the
diaphragm holding member formed of an oval frame, both ends on the long axis side of the
diaphragm holding member are inward direction It is pressed by. As a result, the pair of long
sides facing each other on the short axis side of the diaphragm holding member is deformed in
the direction to open outward, and the diaphragm is stabilized without bending. That is,
according to the electrostatic electro-acoustic transducer according to the present invention, it is
easy to manufacture in a stable state the tension of the oblong diaphragm, and since the
diaphragm is oblong, The internal space of a small electronic product such as a mobile phone can
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be efficiently used, and the effective area of the diaphragm increases, so that an effect such as an
increase in sensitivity can be obtained.
[0009]
Further, in order to solve the problems described above, according to the method of
manufacturing an electrostatic electroacoustic transducer according to the present invention, a
fixed electrode plate, a diaphragm disposed opposite to the fixed electrode plate, and the
diaphragm A method of manufacturing an electrostatic electroacoustic transducer including a
frame-shaped diaphragm holding member for holding the periphery of the mother body, the step
of holding the mother film of the diaphragm in a uniformly tensioned state, and the mother A
process of attaching a diaphragm holding member consisting of an oval frame to a film through
an adhesive, a process of releasing tension on the mother film, and a frame peripheral portion of
the diaphragm holding member in the mother film It is characterized in that it comprises the
steps of separating and pressing the both ends on the long axis side of the diaphragm holding
member from the outside toward the inside. In the step of pressing both ends on the long axis
side of the diaphragm holding member from the outside toward the inside, a step of arranging a
support frame so as to surround the periphery of the diaphragm holding member, and the
support frame side It is preferable that the method further includes the steps of: pressing
members are protruded toward both end portions on the long axis side of the diaphragm holding
member, and the both end portions on the long axis side are pressed inwardly.
[0010]
According to such a manufacturing method, it is possible to easily manufacture an electrostatic
electroacoustic transducer in a state in which the tension of the oval-shaped diaphragm is stable,
and the manufactured electrostatic electroacoustic transducer is Since the diaphragm has an oval
shape, the internal space of a small electronic product such as a mobile phone can be efficiently
used, and the effective area of the diaphragm becomes large, so that the effect of increasing the
sensitivity can be obtained. You can get it.
[0011]
According to the present invention, in the electrostatic electro-acoustic transducer, when the oval
shaped diaphragm is held by the holding member, a stable tension can be obtained without
bending the diaphragm.
[0012]
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FIG. 1 is a plan view of an electrostatic electroacoustic transducer according to the present
invention.
FIG. 2 is a cross-sectional view of the electrostatic electro-acoustic transducer of FIG.
FIG. 3 is a plan view and a cross-sectional view for explaining a process of manufacturing a
diaphragm assembly. FIG. 4 is a plan view and a cross-sectional view for illustrating the process
following FIG. 3. FIG. 5 is a plan view and a cross-sectional view for illustrating the process
following FIG. 4. FIG. 6 is a plan view and a cross-sectional view for illustrating the process
following FIG. FIG. 7 is a plan view for illustrating the process following FIG. FIG. 8 is a plan view
for illustrating the process following FIG. 7.
[0013]
Hereinafter, embodiments of the present invention will be described based on the drawings. FIG.
1 is a plan view of an electrostatic electroacoustic transducer according to the present invention.
FIG. 2 is a cross-sectional view of the electrostatic electro-acoustic transducer of FIG. In the
following description, although the case where the electrostatic electroacoustic transducer
according to the present invention is applied to a condenser microphone is described as an
example, the same configuration is also applied to a condenser headphone or a speaker.
[0014]
As shown in FIG. 1 and FIG. 2, the condenser microphone according to this embodiment includes
the microphone unit 10 whose diaphragm has an oval shape (track field track shape) in plan
view. The microphone unit 10 is configured by opposingly arranging the diaphragm 11 stretched
on the diaphragm ring 12 and the fixed electrode plate 13 supported by the insulating seat 14
via the separator ring 15, In the present invention, the diaphragm ring 12 is formed as an oblong
frame similar to the diaphragm 11. That is, the diaphragm ring 12 has a pair of long side frames
12a and 12a facing each other on the short axis side and parallel to each other, and a pair of arclike frames 12b and 12b facing each other on the long axis side. The diaphragm ring 12 is made
of metal and may be made of, for example, an aluminum material, a brass alloy or the like.
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[0015]
Further, a thin film of synthetic resin having a metal deposition film on one surface is used for
the diaphragm 11. The diaphragm 11 is attached to the diaphragm ring 12 through an adhesive
or the like as the diaphragm assembly, with the metal vapor deposition film side thereof.
[0016]
Further, the separator ring 15 is also formed as an oval frame similar to the diaphragm ring 12.
The separator ring 15 is made of an electrically insulating synthetic resin film. The fixed
electrode plate 13 is similarly formed in an oval shape because the diaphragm 11 is in an oval
shape. For example, an aluminum plate is used for the fixed electrode plate 13, and in this
embodiment, a plurality of sound holes 13a are bored. An electret film may be attached to the
surface of the fixed electrode plate 13 facing the diaphragm 11 to form a back electret condenser
microphone.
[0017]
Further, the insulating seat 14 is made of an electrically insulating synthetic resin material, and
in this embodiment, is provided with a recess 14 a for forming an air chamber 16 of a
predetermined volume on the back side of the fixed electrode plate 13. In the air chamber 16, an
acoustic resistance material (not shown) such as a non-woven fabric may be accommodated. Also,
the insulating seat 14 may be a ceramic material.
[0018]
The microphone unit 10 is disposed in a unit cover (not shown) in a state of being erected
substantially perpendicularly to a microphone base (not shown) via a mount member including a
support frame 20 surrounding the diaphragm ring 12 Be done. Since the diaphragm ring 12 is an
oval, in this embodiment, the support frame 20 is also an oval, and a pair of long side frames 20a
and 20a facing each other on the short axis side and parallel to each other are long. It has a pair
of arc-shaped frame parts 20b and 20b which oppose on the axis | shaft side.
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[0019]
Further, the support frame 20 has correction means 21 for pressing the arc-shaped frame parts
12b and 12b opposed on the long axis side of the diaphragm ring 12 from the outside, and the
pressing force of the correction means 21 causes the short axis side. The long side frame
portions 12a and 12a facing each other are deformed, and the tension is adjusted so that the
diaphragm 11 does not bend. The correction means 21 is, for example, a screw projecting from
the support frame 21 toward both ends of the major axis of the diaphragm ring 12 as shown, and
pressing the both ends on the major axis in the inward direction of the diaphragm ring 12 It has
members 21a and 21a (pressing members). More specifically, the screw members 21 a and 21 a
are screwed to the support frame 20 so as to be capable of advancing and retracting to both end
portions on the long axis side of the diaphragm ring 12. The support frame 20 may be made of
metal or synthetic resin, but preferably has rigidity higher than that of the diaphragm ring 12.
[0020]
In order to obtain the diaphragm assembly of the microphone unit 10 shown in FIGS. 1 and 2,
first, as shown in a plan view in FIG. 3A and a cross sectional view in FIG. 3B, a mother film of the
diaphragm 11 is obtained. Place 1 M on a cylindrical pedestal 6. The mother film 1M is in the
shape of a perfect circle. Next, as shown in a plan view in FIG. 4A and a cross-sectional view in
FIG. 4B, a weight 7 is applied over the entire circumference of the mother film 1M to uniformly
tension the mother film 1M. Do.
[0021]
Next, in this state, as shown in a plan view in FIG. 5A and a cross-sectional view in FIG. 5B, an
oval diaphragm ring 12 is attached onto the mother film 1M through an adhesive. Then, the
weight 7 is removed to release the tension on the mother film 1M. In this state, as shown in a
plan view in FIG. 6 (a) and a cross-sectional view in FIG. 6 (b), the tension of the mother film 1M
serving as the diaphragm 11 disposed inside the diaphragm ring 12 The long side frame parts
12a of the ring 12 are easily deformed inward (toward the diaphragm 11), whereby the tension
of the mother film 1M on the inside of the diaphragm ring 12 which becomes the diaphragm 11
is the mother film 1M. Partially lower than the applied initial tension.
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[0022]
Next, as shown in a plan view in FIG. 7, the frame peripheral portion of the diaphragm ring 12 is
separated from the mother film 1M by a cutter knife or the like. Here, a diaphragm assembly in
which the diaphragm 11 is stretched on the diaphragm ring 12 is obtained, but as described
above, the major axis side frame portions 12a and 12a of the diaphragm ring 12 are deformed
inward. . Therefore, the support frame 20 is disposed so as to surround the diaphragm assembly
consisting of the diaphragm 11 and the diaphragm ring 12, and the correction means 21
provided at both ends on the major axis side thereof Press both ends inward.
[0023]
More specifically, the screw members 21a and 21a are screwed into both end portions of the
support frame 20 on the long axis side, and the tips of the screw members 21a and 21a are
protruded toward the both end portions on the long axis side of the diaphragm ring 12. Let As a
result, the screw members 21a, 21a press the both ends (arc shaped frame portions 12b, 12b) on
the long axis side of the diaphragm ring 12 by the pressing force F1 as shown in the plan view of
FIG. Then, due to the displacement caused by the pressing force F1, the long side frames 12a,
12a opposed on the short axis side of the diaphragm ring 12 are deformed so as to open outward
(direction of F2 in FIG. 8). As a result, the diaphragm 11 stretched on the diaphragm ring 12 is
pulled in the direction in which the short axis extends, and a stable tension can be obtained.
[0024]
As described above, according to the embodiment of the present invention, both ends of the
diaphragm ring 12 on the long axis side when the diaphragm 11 formed in an oval shape is held
by the diaphragm ring 12 formed of an oval frame. The portions (arc shaped frame portions 12b,
12b) are pressed inward. As a result, the pair of long side frames 12a, 12a facing each other on
the short axis side of the diaphragm ring 12 is deformed in the direction to open outward, and
the diaphragm 11 is stabilized without bending. That is, according to the electrostatic electroacoustic transducer according to the present invention, it is easy to manufacture in a stable state
the tension of the oblong diaphragm, and since the diaphragm is oblong, The internal space of a
small electronic product such as a mobile phone can be efficiently used, and the effective area of
the diaphragm increases, so that an effect such as an increase in sensitivity can be obtained.
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[0025]
In the embodiment described above, the electrostatic electro-acoustic transducer according to the
present invention is applied to a condenser microphone as an example. However, the invention is
not limited to the microphone as described above, and a condenser headphone or a speaker may
be used. The same configuration can be applied to the case.
[0026]
Further, in the above embodiment, although the pressing members in the correction means 21
are the screw members 21a and 21a, the present invention is not limited to the configuration,
and for example, a rod-like pin member may be used as the support frame 20. It may be fitted in
the hole on the side and the tip thereof may be protruded to the diaphragm ring 12 side.
[0027]
DESCRIPTION OF SYMBOLS 10 Microphone unit 11 diaphragm 12 diaphragm ring (diaphragm
holding member) 12a long side frame part 12b arc-shaped frame part 13 fixed electrode plate
14 insulation seat 15 separator ring 20 support frame 21 correction means 21a screw member
(pressing member)
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