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JP2016082377

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DESCRIPTION JP2016082377
Abstract: The distance between a fixed pole of an electrostatic electroacoustic transducer and a
vibrating body is kept constant. An electrostatic electroacoustic transducer has a vibrating body
10 between a fixed pole 20U and a fixed pole 20L. The vibrating body 10 is fixed to the fixed
electrode 20U and the fixed electrode 20L by the fixing portion 30. The fixed portion 30 is
formed of a solidified portion 31 in which the adhesive is solidified, and a plurality of particles
32. The particles 32 are glass spheres having an insulating property, and the diameters of the
plurality of particles 32 are uniform. Since the diameter of the particle 32 is uniform, the
distance from the vibrating body 10 to the fixed electrode 20U is the same as the diameter of the
particle 32, and the distance from the vibrating body 10 to the fixed electrode 20L is also the
same as the diameter of the particle 32 Become. In the plurality of fixed portions 30, the distance
from the fixed pole 20U, 20L to the vibrating body 10 is the same as the diameter of the particle
32, so that the variation in the distance from the fixed pole 20U, 20L to the vibrating body 10
can be suppressed. [Selected figure] Figure 4
Fixed pole and electroacoustic transducer
[0001]
The present invention relates to an electrostatic electroacoustic transducer and a fixed pole used
in the electrostatic electroacoustic transducer.
[0002]
Patent Document 1 discloses that a spacer is disposed between an electrode and a vibrating body
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in order to secure a gap between the electrode facing the vibrating body and the vibrating body.
Further, Patent Document 2 discloses that the vibrating body is disposed at a distance from the
electrode by disposing a non-woven fabric between the electrode facing the vibrating body and
the vibrating body. According to the inventions of Patent Documents 1 and 2, the vibrating body
can be separated from the electrodes, and can be vibrated between the electrodes facing each
other with the vibrating body interposed therebetween.
[0003]
JP, 2011-077663, A JP, 2012-023559, A
[0004]
When arranging the spacer or the non-woven fabric between the vibrator and the electrode, an
adhesive is used to bond the respective members.
However, in the case of disposing the non-woven fabric, in the case where the non-woven fabric
is distorted or the thickness thereof, the adhesive thickness is dispersed, etc., the distance
between the vibrator and the electrode can not be kept constant. This distance will vary. When a
frame-shaped spacer is disposed between the electrode and the vibrator as in the invention of
Patent Document 1, the distance between the electrode and the vibrator is defined by the
thickness of the spacer in the portion where the spacer is disposed. However, since there is no
spacer in the central portion, if slack occurs in the central portion of the vibrator, the distance
between the vibrator and the electrode will vary.
[0005]
The present invention has been made under the above-described background, and an object of
the present invention is to provide a technique for keeping the distance between the fixed
electrode of the electrostatic electroacoustic transducer and the vibrator constant.
[0006]
The present invention is a fixed electrode which forms a capacitance between it and an opposing
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vibrating body, and has a fixed portion which contains particles and is fixed to the vibrating
body, and the vibrating body and the vibrating body which sandwich the particles. The fixed
poles provide opposing fixed poles.
The present invention also includes a vibrating body, and a fixed electrode facing the vibrating
body, wherein the vibrating body or the fixed electrode is fixed by a fixed portion including
particles, and the vibrating member sandwiches the particles. And the fixed pole face each other
to provide an electroacoustic transducer.
[0007]
In the present invention, the particles may be an insulator. Further, in the present invention, the
diameter of the particles in contact with the peripheral portion of the vibrator may be different
from the diameter of the particles in contact with the central portion of the vibrator.
[0008]
According to the present invention, the distance between the fixed electrode of the electrostatic
electroacoustic transducer and the vibrator can be kept constant.
[0009]
BRIEF DESCRIPTION OF THE DRAWINGS The external view of the electrostatic-type
electroacoustic transducer 1 which concerns on one Embodiment of this invention.
The exploded view of electrostatic type electroacoustic transducer 1. 1. AA sectional view taken
on the line of FIG. The enlarged view of the cross section of electrostatic-type electroacoustic
transducer 1. FIG. The figure which showed an example of the position where an adhesive agent
is apply | coated in the vibrating body 10. FIG. The figure which showed the electric constitution
which concerns on electrostatic type electroacoustic transducer 1. FIG.
[0010]
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Embodiment FIG. 1 is an external view of an electrostatic electroacoustic transducer 1 according
to an embodiment of the present invention, and FIG. 2 is an exploded view of the electrostatic
electroacoustic transducer 1. As shown in FIG. 3 is a cross-sectional view taken along the line AA
of FIG. 1, and FIG. 4 is an enlarged view of a cross section of the electrostatic electroacoustic
transducer 1. As shown in FIG. In the figure, the directions are indicated by orthogonal X-axis, Yaxis and Z-axis, and the horizontal direction when the electrostatic electro-acoustic transducer 1
is viewed from the front side in the arrow B direction in FIG. The direction and the front and back
direction are the direction of the Y axis, and the height (vertical direction) is the direction of the Z
axis. Further, in the drawings, those in which “●” is described in “○” means an arrow
directed from the back to the front of the drawing. Further, in the drawings, those in which “x”
is described in “o” means an arrow directed from the front to the back of the drawing. The
dimensions of the respective members in the drawing are different from the actual dimensions so
that the shapes and positional relationships of the respective members can be easily understood.
[0011]
The electrostatic electroacoustic transducer 1 is configured by vertically laminating the vibrator
10, the fixed pole 20U, the fixed pole 20L, and the plurality of fixed parts 30. Where the plurality
of fixing portions 30 are not provided, spaces in which the diaphragm 10 can vibrate are formed
between the diaphragm 10 and the fixed electrode 20U and the fixed electrode 20L. In the
present embodiment, the configurations of the fixed pole 20U and the fixed pole 20L are the
same. Therefore, when there is no particular need to distinguish between the fixed pole 20U and
the fixed pole 20L, the descriptions of "L" and "U" etc. at the end of the reference numerals are
omitted.
[0012]
The rectangular vibrator 10 as viewed from above is based on a film (insulation layer) of an
insulating and flexible synthetic resin such as PET (polyethylene terephthalate) or PP
(polypropylene), as a film. A conductive metal is vapor-deposited on one surface to form a
conductive film (conductive layer).
[0013]
The fixed electrode 20 is a conductive film (conductive layer) formed by vapor deposition of a
conductive metal on one surface of a sheet (insulating layer) of insulating synthetic resin such as
PET or PP. It has a rectangular shape when viewed from the direction.
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The fixed pole 20 has a plurality of holes penetrating from the front surface to the back surface,
and allows passage of air and sound waves. In the drawings, the illustration of the holes is
omitted. In the fixed electrode 20U, the insulating layer is on the lower side, and in the fixed
electrode 20L, the insulating layer is on the upper side. In the present embodiment, the fixed
electrode 20 has a structure in which metal is deposited on a sheet of synthetic resin, but the
sheet of synthetic resin having insulating property sandwiches the conductive metal film, and
penetrates from the surface to the back surface A plurality of holes may be provided. Further, the
fixed electrode 20 may have a configuration in which a metal film having conductivity is
sandwiched by paper, and a plurality of holes penetrating from the front surface to the back
surface are provided.
[0014]
The fixing portion 30 is a layer for fixing the vibrating body 10 and the fixed electrode 20 to
each other. Each of the plurality of fixed portions 30 is formed of a solidified portion 31 in which
the adhesive is solidified and a plurality of particles 32 having an insulating property. In the
present embodiment, the particles 32 are spheres of insulating glass, and the diameters of the
plurality of particles 32 are uniform. The diameters of the plurality of particles 32 may not be
the same and may be within the range of a predetermined tolerance.
[0015]
When the vibrator 10 and the fixed electrode 20 are fixed, as shown in FIG. 5, the adhesive
mixed with the particles 32 is shown in FIG. It is applied in a circle at a predetermined distance in
the front-rear direction. Also, on the lower surface of the fixed electrode 20U, an adhesive in
which the particles 32 are mixed similarly to the fixed electrode 20L is applied to a position
facing the fixed portion 30 of the fixed electrode 20L via the vibrating body 10 . In FIG. 5, the
illustration of the plurality of holes penetrating from the front surface to the back surface is
omitted.
[0016]
When the vibrating body 10 is sandwiched between the fixed pole 20 U and the fixed pole 20 L
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to which the adhesive is applied and pressure is applied from above on the surface plate, the
fixed pole 20 U and the fixed pole 20 L are in contact with the particles 32. Since the diameter of
the particles 32 contained in the adhesive is uniform, the distance from the vibrating body 10 to
the fixed electrode 20U is the same as the diameter of the particles 32, and the distance from the
vibrating body 10 to the fixed electrode 20L is also It is the same as the diameter of Then, when
the adhesive solidifies, the solidified portion 31 is formed, and the fixed electrode 20U and the
fixed electrode 20L are fixed to the vibrating body 10. A layer of air is formed on the portion of
the vibrating body 10 to which the adhesive is not attached, and the vibrating body 10 faces the
fixed electrode 20U and the fixed electrode 20L with the air layer interposed therebetween.
Thereby, the vibrating body 10 is held so as to be able to vibrate in the vertical direction.
[0017]
Next, an electrical configuration according to the electrostatic electroacoustic transducer 1 will
be described. As shown in FIG. 6, the electrostatic electroacoustic transducer 1 includes an
amplifier unit 130 to which an acoustic signal representing sound is input, a transformer 110,
and a bias power supply 120 for applying a DC bias to the vibrator 10. The drive circuit 100
provided is connected. The fixed pole 20U is connected to the terminal T1 on the secondary side
of the transformer 110, and the fixed pole 20L is connected to the other terminal T2 on the
secondary side of the transformer 110. The vibrator 10 is also connected to the bias power
supply 120 via the resistor R1. Terminal T3 at the midpoint of transformer 110 is connected to
ground GND, which is the reference potential of drive circuit 100, via resistor R2. An acoustic
signal is input to the amplifier unit 130. The amplifier unit 130 amplifies the input acoustic
signal and outputs the amplified acoustic signal. The amplifier unit 130 has terminals TA1 and
TA2 for outputting an acoustic signal, and the terminal TA1 is connected to the terminal T4 on
the primary side of the transformer 110 via the resistor R3, and the terminal TA2 is connected to
the resistor R4. , And is connected to the other terminal T5 on the primary side of the
transformer 110.
[0018]
When an AC acoustic signal is input to the amplifier unit 130, the input acoustic signal is
amplified and supplied to the primary side of the transformer 110. Then, when the acoustic
signal boosted by the transformer 110 is supplied to the fixed pole 20 and a potential difference
is generated between the fixed pole 20U and the fixed pole 20L, the vibrating body 10 located
between the fixed pole 20U and the fixed pole 20L. An electrostatic force acts on the fixed pole
20U and the fixed pole 20L so as to be drawn to either side.
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[0019]
Specifically, the polarity of the second acoustic signal output from the terminal T2 is opposite to
that of the first acoustic signal output from the terminal T1. When an acoustic signal with
positive polarity is output from the terminal T1 and an acoustic signal with negative polarity is
output from the terminal T2, a positive voltage is applied to the fixed electrode 20U, and a
negative voltage is applied to the fixed electrode 20L. Be done. Since a positive voltage is applied
to the vibrating body 10 by the bias power supply 120, while the electrostatic attractive force
between the vibrating body 10 and the fixed electrode 20U to which the positive voltage is
applied is weakened, the negative voltage is The electrostatic attractive force with the fixed pole
20L being applied is intensified. The portion of the vibrator 10 not in contact with the fixed
portion 30 has a suction force acting on the fixed electrode 20L according to the difference in
electrostatic attraction applied to the vibrator 10, and is displaced on the fixed electrode 20L
(downward).
[0020]
In addition, when the first acoustic signal with negative polarity is output from the terminal T1
and the second acoustic signal with positive polarity is output from the terminal T2, a negative
voltage is applied to the fixed pole 20U, and the fixed electrode 20L is output. Is a positive
voltage. Since a positive voltage is applied to the vibrating body 10 by the bias power supply
120, the electrostatic attractive force between the vibrating body 10 and the fixed electrode 20L
to which the positive voltage is applied is weakened, while the negative voltage is The
electrostatic attraction with the fixed pole 20U being applied is intensified. The portion of the
vibrator 10 not in contact with the fixed portion 30 has a suction force acting on the fixed pole
20U according to the difference in electrostatic attraction applied to the vibrator 10, and is
displaced on the fixed pole 20U (upward).
[0021]
As described above, the vibrating body 10 is displaced upward or downward according to the
acoustic signal (deflection), and the displacement direction is sequentially changed to become
vibration, and the vibration state (frequency, amplitude, phase) is obtained. Sound waves are
generated from the vibrator 10. The generated sound waves pass through the fixed electrode 20
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having sound permeability and are emitted as sound to the outside of the electrostatic electroacoustic transducer 1.
[0022]
According to the present embodiment, the vibrating body 10 and the fixed electrode 20 are in
contact with the particle 32, and the distance from the fixed electrode 20 to the vibrating body
10 is formed to be the same as the diameter of the particle 32 in the plurality of fixed portions
30. Therefore, the distance from the fixed pole 20 to the vibrating body 10 can be kept constant
throughout the fixed pole 20 and the vibrating body 10.
[0023]
[Modifications] Although the embodiment of the present invention has been described above, the
present invention is not limited to the above-described embodiment, and can be practiced in
various other forms.
For example, the above-described embodiment may be modified as follows to implement the
present invention. The above-described embodiment and the following modifications may be
combined with each other.
[0024]
In the embodiment described above, the diameters of the particles 32 included in the plurality of
fixing portions 30 are the same diameter, but the present invention is not limited to this
configuration, and the diameter of the particles 32 is made different depending on the position.
May be For example, the diameter of the particles 32 included in the adhesive applied to the
vibrating body 10 may be reduced from the peripheral portion to the central portion of the
vibrating body 10. According to this configuration, in the peripheral portion of the vibrating body
10, the distance from the vibrating body 10 to the fixed pole 20 is long, and the amplitude of the
peripheral portion of the vibrating body 10 is smaller than that in the central portion. The sound
pressure of the emitted sound is lower than the sound pressure of the sound emitted from the
central portion, and side lobes in directivity characteristics can be suppressed.
[0025]
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In the embodiment described above, the particles 32 are spheres, but the shape of the particles
32 is not limited to spheres, and may be, for example, an ellipsoid. When the particles 32 are
ellipsoidal, when mixing the particles 32 into the adhesive, the major axis of the ellipsoid should
not be perpendicular to the fixed pole 20. In addition, the particles 32 may be substantially
tetrahedrons or substantially cubes, and may have a shape in which a vertex is processed into a
curved surface. In other words, even if the particles 32 do not overlap in the vertical direction
when the fixed electrode 20 is pressed against the vibrating body 10 and the particles 32 are
formed to have a certain height, particles of other shapes may be used. Good.
[0026]
In the embodiment described above, the insulating layer of the fixed electrode 20 and the
insulating layer of the vibrating body 10 are made of transparent synthetic resin, and the
conductive layer of the fixed electrode 20 and the conductive layer of the vibrating body 10 are
transparent such as indium tin oxide and conductive. The fixed electrode 20 and the vibrator 10
may be made transparent as a metal having
[0027]
In the embodiment described above, in the case where the lower surface side of the fixed
electrode 20U, the upper surface side of the fixed electrode 20L, and the front and back surfaces
of the vibrating body 10 are insulated, the particles 32 may be formed of a conductive material.
Good.
[0028]
In the embodiment described above, the adhesive mixed with the particles 32 is applied to the
vibrating body 10 to fix the vibrating body 10 and the fixed electrode 20, but after the adhesive
is applied to the vibrating body 10, the adhesive is applied. The particles 32 may be sprayed to
the adhesive to form the fixing portion 30. Alternatively, after the particles 32 are sprayed to the
vibrating body 10, the adhesive may be applied to form the fixing portion 30.
[0029]
In the embodiment described above, the electrostatic electroacoustic transducer 1 has a pushpull configuration in which the vibrating body 10 is sandwiched between the pair of fixed poles
20, but the configuration of the electrostatic electroacoustic transducer 1 is It is not limited to
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the configuration.
For example, it may be a single type configuration that does not have one of the fixed pole 20U
and the fixed pole 20L.
[0030]
In the embodiment described above, the adhesive containing the particles 32 is applied to the
fixed electrode 20 to fix the fixed electrode 20 and the vibrator 10, but the configuration for
fixing the fixed electrode 20 and the vibrator 10 is as follows: It is not limited to this
configuration.
For example, when manufacturing the electrostatic electroacoustic transducer 1, the adhesive in
which the particles 32 are mixed on the front and back surfaces of the vibrating body 10 is
predetermined in the left and right direction and the front and back direction as viewed from
above. The fixed electrode 20 may be pressed on the surface plate with respect to the vibrating
body 10 to which the adhesive is applied on the surface plate, and the fixed electrode 20 and the
vibrating body 10 may be fixed.
[0031]
In the embodiment or the modification described above, the circular portion to which the
adhesive is applied is arranged in a plurality of rows and a plurality of columns in the fixed
electrode 20 or the vibrator 10, but the portion to which the adhesive is applied is For example,
in the fixed electrode 20 or the vibrator 10, the adhesive may be applied in a grid shape.
In addition, when the circular portion to which the adhesive is applied is arranged in a plurality
of rows and a plurality of columns in the fixed electrode 20 or the vibrator 10, the distance to the
adjacent circular portion depends on the position or the direction. It may be a different
configuration.
[0032]
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In the embodiment described above, the fixed electrode 20 and the vibrator 10 are fixed by an
adhesive, but the method of fixing the fixed electrode 20 and the vibrator 10 is not limited to the
adhesive. For example, the synthetic resin containing the particles 32 is disposed between the
vibrator 10 and the fixed electrode 20, the synthetic resin containing the particles 32 is heated to
melt the synthetic resin, and the vibrator 10 and the fixed electrode 20 are fixed. It is also good.
After applying particles 32 to the resin cured by ultraviolet light and applying it to the vibrator
10 and pressing the fixed electrode 20 against the vibrator 10, the resin is irradiated with
ultraviolet light to cure the resin, and the vibrator 10 and the fixed electrode 20 May be fixed.
Further, the particles 32 coated with the synthetic resin are disposed on the vibrating body 10,
and the fixed electrode 20 is pressed against the vibrating body 10 to press the particles 32, and
the particles 32 are heated to melt the coated resin. Thus, the vibrator 10 and the fixed electrode
20 may be fixed.
[0033]
The electrostatic electro-acoustic transducer 1 of the above-described embodiment operates as a
speaker for emitting sound, but the configuration of the above-described embodiment and
modification can be applied to a microphone that is an electro-acoustic transducer. It is. When
the present invention is operated as a speaker, the circuit shown in FIG. 6 can be used. When the
electrostatic electro-acoustic transducer 1 is used as a microphone, in the drive circuit 100, the
direction of the signal input to and output from the amplifier unit 130 is opposite to that used as
a speaker. When a sound wave is generated outside the electrostatic electroacoustic transducer
1, the vibrator 10 vibrates by the sound wave that has reached the electrostatic electroacoustic
transducer 1. When the vibrating body 10 vibrates, the potential of the fixed electrode 20
changes. The change in the potential of the fixed pole 20 corresponds to the displacement of the
vibration of the vibrating body 10, and is supplied as an acoustic signal to the transformer 110
via the terminal T1 and the terminal T2. Then, the transformer 110 transforms this acoustic
signal and inputs it to the amplifier unit 130, and the amplifier unit 130 amplifies this acoustic
signal and outputs it to a speaker, a computer or the like (not shown).
[0034]
DESCRIPTION OF SYMBOLS 1 ... Electrostatic type electroacoustic transducer, 10 ... Vibrator, 20,
20 U, 20 L ... Fixed pole, 30 ... Fixing part, 31 ... Solidification part, 32 ... Particle, 100 ... Drive
circuit, 110 ... Transformer, 120 ... Bias power supply, 130 ... amplifier section
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