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JP2013059018

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DESCRIPTION JP2013059018
Abstract: [Problem] To suppress deterioration of an electrostatic electroacoustic transducer and
allow it to be deformed. An elastic member (30U) is positioned between an electrode (20U) and a
vibrating body (10) and an elastic member (30L) is positioned between an electrode (20L) and
the vibrating body (10). Further, between the electrodes 20U and 20L and the cover 60, there is
a spacer 40 having elasticity. The cover 60 has a tube 70 which is open at one end into the space
in the cover 60 and is opened at the other end of the cover 60. When the fastener composed of
the convex portions 71A to 71C in the tube 70 is opened, air enters the cover 60, and the air in
the cover 60 vibrates and a sound is emitted. When the fastener is opened and the cover 60 is
folded, the air in the cover 60 is exhausted to the outside through the tube 70. When the fastener
is closed after folding, the cover 60 is sealed and moisture does not enter the cover 60. [Selected
figure] Figure 2
Electrostatic transducer
[0001]
The present invention relates to an electrostatic electroacoustic transducer.
[0002]
As a flexible and foldable electrostatic speaker, for example, there is an electrostatic speaker
disclosed in Patent Document 1.
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1
In this electrostatic speaker, a diaphragm made of polyester, on which aluminum is vapordeposited, is located between two flat electrodes woven by conductive yarns, and an ester wool is
placed between the vibrating membrane and the flat electrodes. Is arranged. The vibrating
membrane, the flat electrode and the ester wool have flexibility and can be folded and stored
when not in use.
[0003]
JP 2008-54154 A
[0004]
By the way, in the speaker of Patent Document 1, since the flat electrode and the vibrating film
are in contact with the air, when there is much moisture in the air, the deterioration may be
accelerated.
As a method of preventing such a problem, it is conceivable to wrap the entire speaker with vinyl
and seal the vinyl surrounding the speaker. On the other hand, in vinyl, it is necessary to put in
air in order to emit sound, but if you try to fold the speaker like a roll or roll it for storage or
transport when not in use, it will be in sealed vinyl. Because the air in the air collects at the end
of the speaker, it can not be bent or rolled like a scroll to deform the speaker. Furthermore, if it is
forcedly folded or rolled, the pressure of air which is collected at the end and loses place will
rupture the vinyl. In addition, a configuration in which a vibrating film is sandwiched between a
pair of electrodes can also be used as an electrostatic microphone. Even in the case of using such
a configuration as an electrostatic microphone, it can not be deformed as in the case of a speaker
as in the case of a speaker by folding or rolling like a scroll, and the pressure of air can not
deform the vinyl. Will burst.
[0005]
The present invention has been made under the above-described background, and it is an object
of the present invention to suppress deterioration of an electrostatic electroacoustic transducer
and allow it to be deformed.
[0006]
In order to solve the problems described above, the present invention opens and closes a passage
having a moisture-proof bag-like cover, a passage having one end opened to the inside of the
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cover and the other end opened to the outside of the cover It has an opening / closing portion, an
electrode having flexibility, a vibrating body having flexibility, and an elastic member located
between the vibrating body and the electrode, transmitting sound and air, and having elasticity
and flexibility. And an electrostatic electroacoustic transducer having a transducer housed in the
cover.
[0007]
Further, according to the present invention, a bag-shaped cover having moisture resistance, a
passage having one end opened to the inside of the cover and the other end opened to the
outside of the cover, an opening / closing portion for opening / closing the passage, and
flexibility A first electrode having a second electrode, a second electrode facing the first electrode
and having flexibility, a vibrator having a flexibility, located between the first electrode and the
second electrode, the vibration An elastic member which is located between the body and the
first electrode and between the vibrator and the second electrode, is permeable to sound and air,
has elasticity and flexibility, and is located within the cover An electrostatic electroacoustic
transducer is provided.
[0008]
In the present invention, a spacer may be provided to secure a predetermined space between the
inner surface of the cover and the conversion unit.
Further, in the present invention, the passage may be in communication between the surface of
the conversion unit and the inner surface of the cover and between the back surface of the
conversion unit and the inner surface of the cover.
Further, in the present invention, the passage between the surface of the conversion unit and the
inner surface of the cover or the back surface of the conversion unit and the inner surface of the
cover is in communication with the passage, and the conversion unit is It is good also as
composition which has a hole which penetrates from the surface to the back.
[0009]
According to the present invention, it is possible to suppress and deform the electrostatic
electroacoustic transducer.
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[0010]
FIG. 1 is a top view of an electrostatic speaker 1 according to an embodiment of the present
invention.
1. AA sectional view taken on the line of FIG.
The figure which expanded the tube 70. FIG. FIG. 2 shows a configuration of a drive circuit 100.
The figure which showed the arrangement | positioning position of the spacer 40A in a
modification. Sectional drawing of the electrostatic-type speaker 1 which concerns on a
modification. The figure which showed the spacer concerning a modification. The figure which
showed the spacer concerning a modification. Sectional drawing of the electrostatic-type speaker
which concerns on a modification. FIG. 2 is a diagram showing an electrical configuration
according to an electrostatic microphone 2.
[0011]
Embodiment FIG. 1 is a top view of an electrostatic speaker 1 (electrostatic electroacoustic
transducer) according to an embodiment of the present invention, and FIG. 2 is a cross-sectional
view taken along line AA of FIG. In the figure, the directions are indicated by the orthogonal Xaxis, Y-axis, and Z-axis, and the horizontal direction when the electrostatic speaker 1 is viewed
from the front is the X-axis direction, and the depth direction is the Y-axis direction. The height
direction is the direction of the Z axis. Further, in the drawings, those in which “•” is described
in “o” 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.
[0012]
As shown in the figure, the electrostatic loudspeaker 1 has a sound output unit 2 composed of a
vibrator 10, electrodes 20U and 20L, and elastic members 30U and 30L, a spacer 40, a cover 60
and a tube 70. . The sound emitting unit 2 is an example of a converting unit that converts a
supplied signal into a sound. In the present embodiment, the configurations of the electrode 20U
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4
and the electrode 20L are the same, and the configurations of the elastic member 30U and the
elastic member 30L are the same. For this reason, in these members, when it is not particularly
necessary to distinguish between a member having a suffix “U” and a member having a suffix
“L”, the descriptions such as “L” and “U” are omitted. . Further, the dimensions of the
respective members in the figure are different from the actual dimensions so that the shapes and
positional relationships of the respective members can be easily understood.
[0013]
(Configuration of Each Part of Electrostatic Speaker 1) First, each part of the electrostatic speaker
1 will be described. The rectangular vibrator 10 as viewed from the point on the Z-axis is one of
films (insulating layers) of insulating and flexible synthetic resin such as PET (polyethylene
terephthalate) or PP (polypropylene). It has a sheet-like structure in which a conductive metal is
vapor-deposited on the surface of the metal layer to form a conductive film (conductive layer). In
the present embodiment, the conductive film is formed on one side of the film, but may be
formed on both sides of the film. The vibrating body 10 may have a configuration in which a
conductive metal is rolled to form a film.
[0014]
The elastic member 30 is a non-woven fabric in this embodiment and can pass air and sound
without passing electricity, and its shape is rectangular when viewed from a point on the Z axis.
Also, the elastic member 30 has elasticity, and deforms when an external force is applied, and
returns to its original shape when an external force is removed. The elastic member 30 may be a
member having insulation, being permeable to sound and air, and elastic, and the heat-added and
compressed cotton, the woven cloth, and the synthetic resin having insulation. It may be spongy
or the like.
[0015]
The electrode (fixed electrode) 20 has a configuration in which a conductive metal is deposited
on one surface of a film (insulating layer) of insulating synthetic resin such as PET or PP to form
a conductive film (conductive layer) It has become. The electrode 20 is rectangular when viewed
from a point on the Z axis. The electrode 20 has a plurality of holes penetrating from the front
surface to the back surface to allow air and sound to pass therethrough, but in the drawings, the
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illustration of the holes is omitted. As in the case of the vibrator 10, the electrode 20 may also be
formed into a film by rolling a conductive metal.
[0016]
The cover 60 is formed in a bag shape by a sheet 61U of synthetic resin and a sheet 61L, and
accommodates the sound emitting unit 2 therein. The sheet 61U and the sheet 61L have
insulation and moisture resistance. In addition, although there is polyethylene as an example of a
material of the sheet 61U and the sheet 61L, the material is not limited to polyethylene, and may
be another material as long as it has insulation properties and moisture resistance. The cover 60
is rectangular when viewed from a point on the Z axis, and the lengths in the X axis direction and
the Y axis direction are longer than the electrode 20, and the area is wider than the electrode 20.
[0017]
In the present embodiment, the spacer 40 is a polyurethane sponge, and its shape is a prismatic
shape. The spacer 40 has air permeability and elasticity. In addition, the spacer 40 should just be
a thing which has air permeability and elasticity, and may be formed with another raw materials,
such as what was given to heat and compressed the batting, and what gave thickness to the
nonwoven fabric.
[0018]
One end of the cable 51A is connected to the conductive film of the electrode 20U located inside
the cover 60, and one end of the cable 51B is connected to the conductive film of the electrode
20L located inside the cover 60. Further, one end of the cable 51C is connected to the conductive
film of the vibrating body 10 located inside the cover 60. Further, the other end of each cable is
connected to the terminal of the connector 141, and an acoustic signal and a bias voltage are
supplied from the outside.
[0019]
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6
The tube 70 is a rubber tube, and is a member that brings the internal space of the cover 60 into
communication with the external space. The tube 70 has convex portions 71A to 71C parallel to
the Y-axis direction and alternately protruding from the inner circumferential surface to the inner
space side of the tube 70. The space in the tube 70 is a passage through which air flows. FIG. 3 is
a view of the tube 70 as viewed from the positive direction side of the X axis in FIG. 1 toward the
negative direction side. The convex portions 71A to 71C function as an openable / closable
fastener, and as shown in FIG. 2 and FIG. 3B, when the convex portion 71C is pushed between
the convex portion 71A and the convex portion 71B, the convex portion The portion 71C is
engaged with and in intimate contact with the projection 71A and the projection 71B, and the
flow of air from one end of the tube 70 to the other end is blocked. Further, as shown in FIG. 3A,
when the convex portion 71C is separated from the convex portion 71A and the convex portion
71B, the space in the tube 70 is connected at one end side and the other end side, and one end to
the other end of the tube 70 Air will flow to the side. That is, the convex portions 71A to 71C
function as an opening and closing portion that opens and closes an air passage.
[0020]
(Structure of Electrostatic Speaker 1) Next, the structure of the electrostatic speaker 1 will be
described. In the electrostatic loudspeaker 1, the vibrating body 10 is disposed between the
lower surface of the elastic member 30U and the upper surface of the elastic member 30L. The
adhesive is applied to the elastic member 30U and the elastic member 30L with a width of
several mm from the edge in the left-right direction and the edge in the depth direction, and the
portion to which the adhesive is applied The inner region is not fixed to the elastic member 30U
and the elastic member 30L.
[0021]
The electrode 20U is superimposed on the upper surface of the elastic member 30U. Further, the
electrode 20L is superimposed on the lower surface of the elastic member 30L. The electrode
20U is coated with an adhesive with a width of several mm from the lateral edge and the edge in
the depth direction and is adhered to the elastic member 30U, and the electrode 20L is formed
from the lateral edge and the edge in the depth direction An adhesive is applied to the inside with
a width of several mm and is adhered to the elastic member 30L. The electrode 20 is in a state in
which the region inside the portion to which the adhesive is applied is not fixed to the elastic
member 30. The electrode 20U is in contact with the elastic member 30U at the side with the
conductive film, and the electrode 20L is in contact with the elastic member 30L at the side with
the conductive film. Two long thin spacers 40 are adhered side by side at a predetermined
04-05-2019
7
interval to the upper surface of the electrode 20U, and two spacers 40 are adhered side by side
at a predetermined interval to the lower surface of the electrode 20L. In the present embodiment,
two spacers 40 are respectively disposed on both sides of the upper surface of the electrode 20U
and on both sides of the lower surface of the electrode 20L such that the longitudinal direction of
the spacer 40 is along the Y-axis direction. The electrodes may be disposed on both sides of the
upper surface of the electrode 20U and on both sides of the lower surface of the electrode 20L
so that the direction is along the X-axis direction.
[0022]
The sheet 61U and the sheet 61L sandwich the tube 70, the cables 51A to 51C, the stacked
electrode 20, the elastic member 30, and the vibrator 10, and an adhesive is applied with a
certain width from the edge, and the mutual edge portions Are bonded to form a bag-like cover
60. In the present embodiment, the electrode 20, the elastic member 30, and the vibrator 10 are
not bonded to the sheet 61U and the sheet 61L, and are located in the space in the cover 60.
Also, one end of the tube 70 is located inside the bag-like cover 60, and the other end is located
outside the bag-like cover 60, of the sheet 61U and the sheet 61L. It is arranged between.
Further, the tube 70 is adhered to the sheet 61U and the sheet 61L without a gap, so that the air
in the bag-like cover 60 does not leak to the outside from between the tube 70 and the sheet
61U and the sheet 61L. There is. The cables 51A to 51C are also adhered to the sheet 61U and
the sheet 61L without a gap, so that air in the bag-like cover 60 does not leak to the outside from
between the cables and the sheet 61U and the sheet 61L. ing.
[0023]
Each component constituting the electrostatic speaker 1 can be bent or rolled like a scroll
because of its flexibility. When the electrostatic speaker 1 is to be folded or rolled like a roll, as
shown in FIG. 3A, the convex portion 71C is separated from the convex portion 71A and the
convex portion 71B. Do. As shown in FIG. 3A, when the convex portion 71C is separated from the
convex portion 71A and the convex portion 71B, the space in the cover 60 is in a state of being
in communication with the outside. In this state, when the electrostatic speaker 1 is bent and
compressed, or rolled and wound in to make a small deformation, the air in the cover 60 is
pushed out and discharged to the outside through the inside of the tube 70, so the cover 60 The
pressure of the air inside will not cause the cover 60 to burst. In the case of bending or rolling,
the air in the cover 60 may be sucked by a pump and the air in the cover 60 may be directly
discharged. Also in this case, the elastic member 30 having elasticity and the spacer 40 are
compressed and become thin.
04-05-2019
8
[0024]
After exhausting the air in the cover 60, as shown in FIG. 3B, when the convex portion 71C is
pushed between the convex portion 71A and the convex portion 71B, the air flow from the
outside to the inside of the tube 70 Is shut off, and the cover 60 is sealed. Since the sheet 61U
and the sheet 61L constituting the cover 60 have moisture resistance, when the cover 60 is
sealed, external moisture does not intrude into the cover 60, and the electrode 20 and vibration
during storage are kept. Deterioration of the conductive film of the body 10 can be suppressed.
[0025]
On the other hand, when the electrostatic speaker 1 is used, as shown in FIG. 3A, the convex
portion 71C is separated from the convex portion 71A and the convex portion 71B, and the
electrostatic speaker 1 is bent or rounded. Spread out. When the convex portion 71C is separated
from the convex portion 71A and the convex portion 71B, external air passes through the inside
of the tube 70 and enters the cover 60. The space in the tube 70 is connected between the
electrode 20U side (front surface side of the sound emitting unit 2) and the sheet 61U, and
between the electrode 20L side (back surface side of the sound emitting unit 2) and the sheet
61L. The air that has entered the cover 60 flows to the surface side of the sound output portion 2
and the back surface side of the sound output portion 2, and the compressed spacer 40 and the
elastic member 30 expand due to elastic restoring force. When the spacer 40 is expanded, as
shown in FIG. 2, the spacer 40 is shaped like a prism so that a space (gap) of uniform and
predetermined thickness is formed between the electrode 20 and the cover 60. A layer of air
necessary for sound is secured.
[0026]
After the spacer 40 and the elastic member 30 expand and air enters the cover 60, as shown in
FIG. 3 (b), when the projection 71C is pushed between the projection 71A and the projection
71B, The flow of air from the outside to the inside is shut off, and the inside of the cover 60 is
sealed. Also here, since the inside of the cover 60 is sealed, external moisture does not intrude
into the inside, and the deterioration of the conductive film of the electrode 20 and the vibrating
body 10 can be suppressed.
04-05-2019
9
[0027]
(Electrical Configuration of Electrostatic Loudspeaker 1) Next, the electrical configuration of the
electrostatic loudspeaker 1 will be described. As shown in FIG. 4, the drive circuit 100 for driving
the electrostatic speaker 1 includes an amplification unit 130, a transformer 110, a bias power
supply 120, a resistor R1, and a female connector 140.
[0028]
The amplification unit 130 is an amplification unit that amplifies and outputs an input acoustic
signal. The amplification unit 130 is connected to the terminal of the primary coil of the
transformer 110. The AC acoustic signal amplified by the amplification unit 130 is supplied to
the transformer 110.
[0029]
The center tap of the secondary coil of the transformer 110 is connected to the ground GND of
the drive circuit 100. One terminal of the secondary coil of the transformer 110 is connected to
the first terminal of the female connector 140, and the other terminal of the secondary coil of the
transformer 110 is the third terminal of the female connector 140. It is connected to the. The
bias power supply 120 is a power supply for applying a positive DC bias voltage to the vibrator
10, and is connected to the second terminal of the female connector 140 via the resistor R1
functioning as a protective resistance. There is. The positive side of the bias power supply 120 is
connected to the resistor R1, and the negative side of the bias power supply 120 is connected to
the ground GND.
[0030]
The first terminal of the male connector 141 is connected to the electrode 20U by the cable 51A,
and the third terminal of the connector 141 is connected to the electrode 20L by the cable 51B.
Further, the second terminal of the connector 141 is connected to the vibrating body 10 by the
cable 51C. In the connector 140 and the connector 141, the terminals are insulated.
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[0031]
When driving the electrostatic speaker 1 with the drive circuit 100, the electrostatic speaker 1 is
expanded to introduce air into the cover 60, and then the male connector 141 is fitted to the
female connector 140. When the connector 141 is fitted in the connector 140, terminals of the
same number are connected, the bias power supply 120 is connected to the vibrating body 10
via the resistor R1, and a positive bias voltage is applied to the vibrating body 10 by DC. . Also,
when the connector 140 and the connector 141 are connected, the terminal of the secondary coil
of the transformer 110 is connected to the electrode 20U and the electrode 20L. Since the center
tap of the transformer 110 is connected to the ground GND, when the amplitude of the acoustic
signal input to the amplification unit 130 is 0 V, the voltage of the electrode 20 U and the
electrode 20 L is 0 V.
[0032]
Next, the case where the amplitude of the acoustic signal changes from 0 V will be described.
When an AC acoustic signal is input to the amplification unit 130, the input acoustic signal is
amplified and supplied to the primary side of the transformer 110. The acoustic signal boosted
by the transformer 110 and supplied to the electrode 20L is boosted by the transformer 110 and
has the same amplitude as that of the acoustic signal supplied to the electrode 20U but with the
opposite polarity of the signal.
[0033]
When a positive acoustic signal is supplied to the amplification unit 130, a positive voltage is
applied to the electrode 20U, and a negative voltage is applied to the electrode 20L, electrostatic
attraction between the vibrating body 10 and the electrode 20U While the electrostatic attraction
between the vibrator 10 and the electrode 20L becomes stronger. Then, the vibrator 10 is
displaced to the electrode 20L side (opposite to the Z-axis direction) according to the difference
between the electrostatic attractive force acting on the electrode 20U side and the electrostatic
attractive force acting on the electrode 20L side.
[0034]
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11
Further, when a negative voltage is applied to the electrode 20U and a positive voltage is applied
to the electrode 20L due to the negative acoustic signal being supplied to the amplification unit
130, the static electricity between the vibrating body 10 and the electrode 20L is generated.
While the electrostatic attraction is weakened, the electrostatic attraction between the vibrator
10 and the electrode 20U is intensified. Then, the vibrator 10 is displaced to the electrode 20U
side (Z-axis direction) according to the difference between the electrostatic attractive force acting
on the electrode 20U side and the electrostatic attractive force acting on the electrode 20L side.
[0035]
As described above, the vibrating body 10 is displaced in the positive direction of the Z axis and
the negative direction of the Z axis in the figure according to the acoustic signal, and becomes a
vibration by sequentially changing its displacement direction. , An acoustic wave corresponding
to the amplitude, phase) is generated from the vibrator 10.
[0036]
In the present embodiment, the spacer 40 and the elastic member 30 expand during use, and the
amount of air necessary to emit a sound enters the cover 60, so the vibration of the vibrating
body 10 causes the inside of the cover 60 to The air can be vibrated and the sound can be
emitted.
Further, in the present embodiment, since the tube 70 is closed to seal the cover 60, it is possible
to suppress the deterioration of the conductive film of the vibrating body 10 and the electrode
20 due to moisture. In addition, when not in use, the air in the cover 60 can be discharged and
folded and rolled, so it can be stored small. In addition, although it is preferable that there is no
difference in the thickness in the Z-axis direction of each of the plurality of spacers 40, each
thickness may be different. Moreover, it is preferable that one spacer 40 has no deviation in
thickness in the Z-axis direction. When the difference in thickness of each spacer 40 is small and
there is no deviation in thickness in each, it is possible to secure a space with a thickness close to
a predetermined uniform on the front surface side and the rear surface side of the sound
emitting portion 2. When the thickness of this space is close to uniform, the sound pressure of
the emitted sound will be close to uniform as seen from the top side.
[0037]
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12
[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.
[0038]
(Modification 1) Although the electrostatic speaker 1 includes the spacer 40 in the abovedescribed embodiment, the spacer 40 may not be provided. In this configuration as well, since
the air corresponding to the expansion of the elastic member 30 enters the cover 60, the air
between the electrode 20 and the vibrating body 10 can be vibrated to emit a sound.
[0039]
(Modification 2) In the present invention, when the thickness in the Z-axis direction of the spacer
40 is increased, the amount of air entering the cover 60 is increased, and when the thickness in
the Z-axis direction of the spacer 40 is decreased, The amount of air entering is reduced.
Therefore, in the present invention, the amount of air entering the cover 60 may be set by the
thickness of the spacer 40 in the Z-axis direction.
[0040]
(Modification 3) In the embodiment described above, two spacers 40 are disposed on the upper
surface of the electrode 20U and two spacers 40 are disposed on the lower surface of the
electrode 20L, but are disposed on the surface of each electrode 20 The number of spacers 40 is
not limited to two, and may be three or more or one. Further, the shape of the spacer 40 is not
limited to the shape of a prism, and may be a shape of a triangular prism, a shape of a cylinder,
or a shape of a cube. Alternatively, as shown in FIG. 5A, a lattice-shaped spacer 40A may be used
as viewed from above. In addition, as shown in FIG. 5B, a plurality of spacers 40B in the shape of
a rectangular parallelepiped may be arranged side by side at predetermined intervals in the Xaxis direction and the Y-axis direction. Further, in the above-described embodiment, the spacer
40 is bonded to the electrode 20, but may be bonded to the inner surface of the cover 60 without
being bonded to the electrode 20.
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13
[0041]
(Modification 4) In the embodiment described above, the movement of air between the inside and
the outside of the cover 60 is blocked by the convex portions 71A to 71C, but the configuration
for blocking the movement of air is the same as that of the embodiment described above. It is not
limited to the configuration. For example, the movement of air may be blocked by closing the
tube 70 by plugging the tube 70, or by blocking the movement of the air by bending the tube 70
and fixing the bent portion with a clip. Good. Further, the configuration for moving air between
the inside and the outside of the cover 60 is not limited to the configuration of the abovedescribed embodiment. For example, an air valve may be provided on the upper surface side or
the lower surface side of the cover 60 to adjust the movement of air between the inside and the
outside of the cover 60.
[0042]
(Modification 5) In the embodiment described above, the cables 51A to 51C and the tube 70 are
located in the portion where the sheet 61U and the sheet 61L are adhered to each other in the
cover 60, and these components are the sheet 61U and the sheet 61L. Although sandwiched and
bonded, other components may be bonded to the cover 60 as described later.
[0043]
FIG. 6 is a view showing a cross section of the electrostatic loudspeaker 1 according to the
present modification.
As shown in FIG. 6, in the present modification, the lengths in the X-axis direction of the
electrode 20 and the vibrating body 10 are made shorter than the length of the elastic member
30. Further, the end of the elastic member 30U in the negative direction of the X axis is adhered
to the sheet 61U, and the both ends in the X axis direction of the elastic member 30L are
adhered to the sheet 61L, and the end portions of the elastic member 30U and the elastic
member 30L Adhere the protruding parts) together. In the elastic member 30U and the elastic
member 30L bonded to each other, holes 80 penetrating the elastic member 30U and the elastic
member 30L are provided at both end portions not bonded to the sheet 61. Further, the length in
the Y-axis direction of the electrode 20 and the vibrator 10 is shorter than the length of the
elastic member 30, and both ends in the Y-axis direction of the elastic member 30U protruding
04-05-2019
14
from the electrode 20 and the vibrator 10 are bonded to the sheet 61U. Similarly, both ends in
the Y-axis direction of the elastic member 30L that has run out are bonded to the sheet 61L, and
the ends of the elastic member 30U and the end of the elastic member 30L (a portion that
protrudes from the vibrating body 10) are bonded to each other. In this configuration, air
entering the cover 60 from the tube 70 first flows between the electrode 20 U side and the cover
60. Also, air flowing between the electrode 20U and the cover 60 also flows between the
electrode 20L and the cover 60 through the holes 80. Further, the air that has entered the cover
60 also flows in the negative direction of the X axis through the spacer 40 because the spacer 40
has air permeability. In this modification, since there is a hole 80 penetrating the elastic member
30, air can easily flow to the upper surface (front surface) side and the lower surface (back
surface) side, and the air can be flowed on the upper surface (front surface) side and the lower
surface (back surface) side. Less bias in volume.
[0044]
In FIG. 6, the edge in the positive direction of the X axis of the elastic member 30U is not bonded
to the sheet 61U, and the edge of the elastic member 30L is bonded to the sheet 61L. The edge
on the positive direction side may not be bonded to the sheet 61L, and the edge of the elastic
member 30U may be bonded to the sheet 61U. Further, the lengths of the electrode 20 in the Xaxis direction and the Y-axis direction are the same as those of the elastic member 30, the
negative direction end of the X-axis of the electrode 20U is adhered to the sheet 61U, and both
ends of the electrode 20L in the X-axis direction It may be adhered to the sheet 61 L and a hole
may be formed through the electrode 20 and the elastic member 30. Further, in this
configuration, the vibrating body 10 may have the same length in the X-axis direction and the Yaxis direction as the elastic member 30, and a hole may be formed through the vibrating body
10, the electrode 20 and the elastic member 30.
[0045]
(Modification 6) Although the spacer 40 has elasticity in the embodiment described above, it may
not have elasticity as long as it has air permeability. Further, the material of the spacer 40 may
be a material not having elasticity and breathability. In addition, when using the raw material
which is not equipped with elasticity and air permeability, you may make it provide the recessed
part 41 in the spacer 40, as shown to Fig.7 (a). According to this configuration, even if the spacer
40 is bonded to the cover 60 and the sound output portion 2, the air in the space partitioned by
the spacer 40 moves to the space of the next compartment through the recess 41 serving as the
air passage. Therefore, a plurality of spaces are secured between the sound emitting unit 2 and
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the cover 60. In addition, as shown in FIG. 7B instead of the recess 41, the spacer 40 may be
provided with a hole 42 penetrating in the short direction of the spacer 40 (direction of Y axis in
FIG. 7). According to this modification, the holes 42 become a passage through which air passes,
and the air in the space partitioned by the spacer 40 moves to the space of the adjacent
compartment. Space is secured. 8 (a) to 8 (c) are diagrams showing modifications of the spacer
40A. 8 (a) is a plan view of a spacer 40A according to the present modification, FIG. 8 (b) is a side
view of the spacer 40A according to the present modification, and FIG. 8 (c) is a spacer 40A
according to the present modification. It is a front view of. In this modification, the material of
the spacer 40A is a material which does not have elasticity and air permeability, and is provided
with the recess 41 similarly to the spacer shown in FIG. According to this configuration, even if
the spacer 40A is bonded to the cover 60 and the sound output portion 2, the air in the space
partitioned by the spacer 40A moves to the space of the next section through the recess 41, so
the sound output portion A space is secured between the cover 2 and the cover 60.
[0046]
(Modification 7) In the embodiment mentioned above, although the space is secured between the
cover 60 and the sound output unit 2 by the spacer, the spacer may not be provided. For
example, the cover 60 is formed of an elastic material. In this cover, the sound emitting portion 2
is disposed in the cover, the convex portion 71C is separated from the convex portion 71A and
the convex portion 71B (that is, the inside of the cover and the outside of the cover are in
communication), and no external force is applied to the cover. In the state, an air layer is formed
between the inner surface of the cover and the sound emitting portion 2. According to this
configuration, when the convex portion 71C is separated from the convex portion 71A and the
convex portion 71B, the air in the cover can be discharged, and the pressure of the air in the
cover does not rupture the cover even if it is bent. . In addition, when the cover is pressed from
the outside to forcibly discharge the internal air, the cover is deformed, and the thickness in the
Z-axis direction can be reduced. In addition, when the convex portion 71C is separated from the
convex portion 71A and the convex portion 71B from a state in which the air in the cover is
removed and thinned, air enters the cover and the cover deforms in a direction of swelling by the
elasticity of the cover itself. A space can be secured between the sound emitting unit 2 and the
cover.
[0047]
(Modification 8) The electrostatic loudspeaker according to the embodiment described above is a
push-pull electrostatic loudspeaker, but may be a single electrostatic loudspeaker. FIG. 9 is a view
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showing a cross section of the electrostatic loudspeaker according to the present modification. As
shown in the figure, the electrostatic loudspeaker according to the present modification does not
include the electrode 20L, and the spacer 40 is disposed between the elastic member 30L and
the sheet 61L. In this configuration, the electrode 20U, the elastic members 30U and 30L, and
the vibrator 10 serve as the sound output unit 2. According to this configuration, the elastic
member 30L and the spacer 40 on the back surface side of the sound output unit 2 ensure a
space on the back surface side of the sound output unit 2 as well. can do.
[0048]
(Modification 9) In the embodiment described above, although the configuration in which the
electrode, the vibrator and the elastic member are stacked is used as an electrostatic type
speaker for converting an acoustic signal into a sound, this configuration converts the sound into
an acoustic signal. It is also possible to use an electrostatic microphone (electrostatic
electroacoustic transducer) for conversion. FIG. 10 is a diagram showing a configuration of an
electrostatic microphone 3 according to the present modification and an acoustic signal
generation circuit 200 that generates an acoustic signal representing a sound picked up by the
electrostatic microphone 3. In the present modification, the electrostatic microphone 3 includes
the same members as the electrostatic speaker 1 described above. Therefore, the members
constituting the electrostatic microphone 3 include the respective members of the electrostatic
speaker 1. The same reference numerals are given and the description thereof is omitted.
Further, since the configuration of the acoustic signal generation circuit 200 is the same as that
of the drive circuit 100 except that the direction in which the signal flows is different from that
of the drive circuit 100, components included in the acoustic signal generation circuit 200 are
components included in the drive circuit 100 The same reference numerals are given and the
description of each part is omitted. In addition, the transformation ratio of the transformer 110 is
adjusted suitably.
[0049]
In the electrostatic microphone 3, the electrode 20 as a conductor and the vibrating body 10 as a
conductor are disposed facing each other at a distance, and the electrode 20 and the vibrating
body 10 are capacitors configured by parallel flat conductors. It is functioning. Since a bias
voltage is applied to the vibrator 10, when no sound reaches the electrostatic microphone 3, a
constant charge is accumulated in the capacitor. When the sound reaches the electrostatic
microphone 3, the vibrator 10 vibrates by the sound that has reached. When the vibrating body
10 vibrates, the distance between the vibrating body 10 and the electrodes 20U and 20L
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changes, so that the capacitance between the vibrating body 10 and the electrode 20 changes.
[0050]
For example, when the vibrating body 10 is displaced toward the electrode 20U, the distance
between the electrode 20U and the vibrating body 10 is shortened, and the capacitance between
the electrode 20U and the vibrating body 10 is increased. Further, the distance between the
electrode 20L and the vibrating body 10 becomes longer, and the capacitance between the
electrode 20L and the vibrating body 10 becomes smaller. Thus, when the capacitance changes,
the potential of the electrode 20U changes so that the potential difference between the electrode
20U and the vibrating body 10 decreases, and the potential of the electrode 20L such that the
potential difference between the electrode 20L and the vibrating body 10 increases. Changes.
Here, since a potential difference occurs between the electrode 20U and the electrode 20L,
current flows in the secondary coil of the transformer 110.
[0051]
Further, when the vibrating body 10 is displaced to the electrode 20L side, the distance between
the electrode 20L and the vibrating body 10 becomes short, and the capacitance between the
electrode 20L and the vibrating body 10 becomes large. Further, the distance between the
electrode 20U and the vibrating body 10 becomes longer, and the capacitance between the
electrode 20U and the vibrating body 10 becomes smaller. Then, the potential of the electrode
20L changes so that the potential difference between the electrode 20L and the vibrating body
10 becomes smaller, and the potential of the electrode 20U changes so that the potential
difference between the electrode 20U and the vibrating body 10 becomes larger. Here, a
potential difference occurs between the electrode 20U and the electrode 20L, and a current flows
in the secondary coil of the transformer 110 in the direction opposite to that when the vibrating
body 10 is displaced in the direction of the electrode 20U.
[0052]
When current flows in the secondary coil of the transformer 110, current also flows in the
primary coil of the transformer 110 in response to this current. The signal that has flowed to the
primary coil is amplified by the amplifier 130, and the amplified signal is output from the
amplifier 130 as an acoustic signal representing the sound collected by the electrostatic
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microphone 3. Here, the sound emitting unit 2 in the electrostatic speaker 1 functions as a sound
collecting unit for collecting sound in the electrostatic microphone 3. In addition, the sound
collection unit of the electrostatic microphone 3 is an example of a conversion unit that converts
the collected sound into a signal. Therefore, the sound emitting unit 2 in the electrostatic speaker
1 and the sound collecting unit in the electrostatic microphone 3 are both examples of a
converting unit that performs conversion between an electric signal and sound.
[0053]
In the present modification, when the impedance of the transformer 110 is low, the frequency
characteristic at a low frequency may be degraded due to the influence of the load capacity of
the electrostatic microphone 3. In this case, in place of the transformer 110, an amplifier with
high impedance may be connected to the electrodes 20U and 20L to suppress a decrease in
frequency characteristics.
[0054]
DESCRIPTION OF SYMBOLS 1 ... Electrostatic type speaker, 2 ... Sound emission part, 3 ...
Electrostatic type microphone, 10 ... Vibrator, 20, 20 U, 20 L ... Electrode, 30, 30 U, 30 L ... Elastic
member, 40 ... Spacer, 60 ... Cover, 61 U, 61 L: sheet, 70: tube, 80: hole, 100: drive circuit, 110:
transformer, 120: bias power source, 130: amplification unit, 140, 141: connector, 200: acoustic
signal generation circuit, R1: resistance vessel
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