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JP2009284397

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2009284397
An object of the present invention is to efficiently drive a vibrator even with a cloth-like
electrode. In the electrostatic speaker 1, members are sequentially stacked in the order of a
conductive cloth 20L, an elastic member 30L, a vibrator 10, an elastic member 30U, and a
conductive cloth 20U, and a thread 40 penetrates the stacked members. The members are sewn
together. The conductive cloths 20U and 20L are obtained by weaving conductive yarns and the
surface is raised, so the space between the woven yarn and the step between the yarn and the
space between the warp and the weft is Filled with this raised fiber. As a result, the difference in
level and space between the woven yarn and the yarn is eliminated, the area acting as an
electrode is increased, the distance between the conductive cloth and the vibrator becomes
constant, and the entire conductive cloths 20U and 20L are electrodes. The vibrator 10 is driven
with a larger driving force than when the conductive cloths 20U and 20L are not raised. [Selected
figure] Figure 2
Electrostatic speaker
[0001]
The present invention relates to an electrostatic speaker.
[0002]
In the field of loudspeakers, there are loudspeakers called electrostatic loudspeakers.
12-05-2019
1
This electrostatic speaker is composed of two electrodes facing each other at intervals and a
sheet-like vibrator having conductivity inserted between the two electrodes, and the
predetermined vibration When a bias voltage is applied and the voltage applied to the electrode
is changed, the electrostatic force acting on the vibrating body is changed, and thereby the
vibrating body is displaced. If this applied voltage is changed according to the input acoustic
signal, the vibrator repeats displacement (i.e. vibrates) accordingly, and a reproduction wave
corresponding to the acoustic signal is generated from the vibrator. And in such an electrostatic
speaker, as described in Non-Patent Document 1, a flexible electrostatic that can be deformed
into various shapes by using two electrodes and a vibrating body as a soft cloth There has also
been conceived a type speaker and an electrostatic type speaker having a soft cloth as an
electrode as described in Non-Patent Document 2.
[0003]
Takeoka Adult, 5 others, "1 bit wavefront recording and reproducing system using condenser
microphone / speaker", Technical report of IEICE. EA, Applied Acoustics, The Institute of
Electronics, Information and Communication Engineers, June 2005, pp. 25-30 <A & V Festa
2006 report: 1 bit audio> Exhibiting a 1 bit delivery system using IEEE 1394, [online], September
21, 2006, Phil-web editorial department, [May 15, 2008], Internet,
<http://www.phileweb.com/news/d-av/200609/21/16653.html>
[0004]
Now, when a conductive cloth is used as an electrode as disclosed in Non Patent Literatures 1
and 2, in the cloth, a warp and a weft cross and there is a space between the warp and the weft. .
Thus, if there is a space between the warp and weft, the area actually acting as an electrode in
the cloth is narrower than the area calculated by the length of the cloth × the length of the cloth,
The force for driving the vibrator tends to be inferior as compared to the case where a metal flat
plate having the same length and width as the electrode is used. Moreover, when the cloth which
has electroconductivity is used as an electrode as described in the nonpatent literature 1, 2, the
cloth used as an electrode is woven combining thread | yarns, and the level | step difference is in
the part which thread | yarn intersects. is there. Since the surface of the cloth is not flat due to
the step, when the conductive cloth is used as an electrode, the distance between the cloth and
the vibrator is not constant, as compared with the case where a flat metal plate is used as an
electrode. The driving force of the vibrator tends to be inferior.
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2
[0005]
The present invention has been made under the above-described background, and it is an object
of the present invention to provide a technique for efficiently driving a vibrator even with a clothlike electrode.
[0006]
In order to solve the problems described above, according to the present invention, a cloth-like
first electrode formed of conductive fibers and having a surface raised is formed of conductive
fibers and the surface is raised, A cloth-like second electrode spaced apart from the first
electrode, conductive, and a vibrator positioned between the first electrode and the second
electrode, the vibrator, and the vibrator A first elastic member located between the first electrode
and having insulation, elasticity and sound transmission, and between the vibrator and the
second electrode, having insulation, elasticity and sound transmission Provided is an electrostatic
speaker having a second elastic member having flexibility, and the first electrode, the first elastic
member, the vibrating body, the second elastic member, and a restraining member for restraining
displacement of the second electrode. Do.
[0007]
In the present invention, the first electrode and the second electrode may be formed by weaving
a conductive yarn.
In the present invention, the first electrode and the second electrode may be stretchable.
[0008]
According to the present invention, even a cloth-like electrode can drive the vibrator efficiently.
[0009]
First Embodiment FIG. 1 is a view schematically showing the appearance of an electrostatic
speaker 1 according to an embodiment of the present invention, and FIG. 2 is a schematic view
showing a cross section and an electrical configuration of the electrostatic speaker 1. FIG.
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As shown in the figure, this electrostatic speaker 1 is composed of a vibrating body 10,
conductive cloths 20U and 20L, elastic members 30U and 30L, and a thread 40.
In the present embodiment, the configurations of the conductive cloths 20U and 20L are the
same, and the configurations of the elastic members 30U and 30L are the same. Therefore, when
there is no need to distinguish between the two, "L" and "U" Description of is omitted. Further, the
dimensions of the respective components such as the vibrator and the conductive cloth in the
drawing are different from the actual dimensions so that the shapes of the components can be
easily understood. Further, in the drawings, those in which “•” is described in “o” means an
arrow directed from the back to the front of the drawing.
[0010]
(Configuration of Each Part of Electrostatic Speaker 1) First, each part of the electrostatic speaker
1 will be described. The vibrating body 10 is, for example, a film made of PET (polyethylene
terephthalate, polyethylene terephthalate), PP (polypropylene, polypropylene) or the like, with a
metal film deposited or coated with a conductive paint, and the thickness thereof is several μm
to The thickness is about several tens of μm.
[0011]
The elastic member 30 having elasticity is obtained by applying heat and compressing the batt to
allow passage of air, and its shape is rectangular. The elastic member 30 deforms when an
external force is applied, and returns to its original shape when the external force is removed. In
the present embodiment, the lengths of the elastic member 30 in the X direction and the Y
direction are longer than the lengths in the X direction and the Y direction of the rectangular
conductive cloth 20 described later. It is longer than the length in the direction and Y direction.
Further, the heights of the elastic member 30U and the elastic member 30L in the Z direction are
the same.
[0012]
The conductive cloth 20 is a cloth obtained by plain-weaving a conductive warp and a conductive
weft, and one surface of the cloth is raised by a raising machine. The shape of the conductive
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cloth 20 is rectangular, and air can pass between the warp and weft and between the raised
fibers, so that the sound transmission is ensured. As a method of raising the cloth, there is a
method of raising the surface of the cloth with a drum with a needle, or a method such as emery
raising, but in the present embodiment, the conductive cloth 20 is raised by emery raising. Is
preferred. The yarn 40 is, for example, a yarn for sewing together the conductive cloth 20, the
elastic member 30, and the vibrator 10, and the material thereof is a material having no
conductivity such as cotton.
[0013]
(Method of assembling electrostatic speaker 1) Next, a method of assembling the electrostatic
speaker 1 will be described. When assembling the electrostatic speaker 1, first, the elastic
member 30L is placed on the raised surface of the conductive cloth 20L. When placing the
elastic member 30L on the conductive cloth 20L, the elastic member 30L is placed on the
conductive cloth 20L such that each side of the elastic member 30L is positioned outside each
side of the conductive cloth 20L. Next, the vibrator 10 is placed on the elastic member 30L.
When the vibrating body 10 is placed on the elastic member 30L, the sides of the vibrating body
10 are placed on the elastic member 30L so as to be positioned inside the sides of the elastic
member 30L.
[0014]
Then, the elastic member 30U is placed on the vibrating body 10. When placing the elastic
member 30U on the vibrator 10, the positions of the four corners of the elastic member 30U and
the elastic member 30L overlap while the sides of the elastic member 30U are positioned outside
the sides of the vibrator 10 Thus, the elastic member 30L is placed on the vibrating body 10.
Here, since the lengths in the X and Y directions of the elastic member 30 are longer than the
lengths in the X and Y directions of the vibrating body 10, each side of the rectangular vibrating
body 10 corresponds to the elastic member 30U and the elastic member 30L. And between the
elastic members 30U and 30L.
[0015]
Next, the conductive cloth 20U is placed on the elastic member 30U with the raised surface
facing the elastic member 30U. When placing the conductive cloth 20U on the elastic member
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30U, positions of the four corners of the conductive cloth 20U and the conductive cloth 20L are
Z while each side of the conductive cloth 20U is positioned inward of each side of the elastic
member 30U. The conductive cloth 20U is placed on the elastic member 30U so as to overlap in
the direction.
[0016]
Then, after the conductive cloth 20, the vibrating body 10 and the elastic member 30 have been
overlapped, the respective members are sewn together with the thread 40 having no
conductivity. The respective members are sewn together and restrained by the thread 40
penetrating each member as shown in FIG. 1, so that the conductive cloth 20, the elastic member
30, and the vibrator 10 do not shift even if deformed. Further, the elastic member 30 having the
insulating property has a larger area than the vibrating body 10 and the conductive cloth 20, and
each side of the elastic member 30 is positioned outside the respective sides of the vibrating
body 10 and the conductive cloth 20. The conductive cloth 20 and the vibrator 10 do not contact
and short circuit.
[0017]
(Electrical Configuration of Electrostatic Speaker 1) Next, the electrical configuration of the
electrostatic speaker 1 will be described. As shown in FIG. 2, the electrostatic speaker 1 includes
a transformer 50, an input unit 60 to which an acoustic signal is input from the outside, and a
bias power supply 70 for applying a DC bias to the vibrator 10. The bias power supply 70 is
connected to the vibrating body 10 and the middle point on the output side of the transformer
50, and the two conductive cloths 20 are connected to one end and the other end of the output
side of the transformer 50, respectively. In this configuration, when an acoustic signal is input to
the input unit 60, a voltage corresponding to the input acoustic signal is applied to the
conductive cloth 20. Then, when a potential difference is generated between the conductive cloth
20U and the conductive cloth 20L by the applied voltage, an electrostatic force acts on the
vibrating body 10 so as to be drawn to either side of the conductive cloth 20U or the conductive
cloth 20L. That is, the vibrating body 10 is displaced in the Z direction (deflection) according to
the acoustic signal, and the displacement direction is successively changed to become vibration,
and the sound corresponding to the vibration state (frequency, amplitude, phase) It originates
from the vibrating body 10. The generated sound passes through at least one of the conductive
cloths 20 and is emitted to the outside of the electrostatic speaker 1.
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[0018]
3 (a) is an enlarged view of the conductive cloth 20U before raising, and FIG. 3 (b) is an enlarged
view of the conductive cloth 20U after raising, as shown in FIG. 3 (b). When the conductive cloth
20U is raised, the space between the warp and weft is filled with the raised fibers 22, so that the
area acting as an electrode becomes wider than in the case of FIG. 3A, and FIG. The vibrator 10
can be driven more efficiently than in the state of. 4 (a) is an enlarged view of a cross section of a
portion where the conductive cloth 20U and the elastic member 30U are in contact, and FIG. 4
(b) shows the conductive cloth 20U when the conductive cloth 20U is not raised. FIG. 4B is an
enlarged view of a cross section of the elastic member 30U, but as shown in FIG. 4B, when the
surface of the conductive cloth 20U is not raised, there is a space SP in the step between the
woven yarn and the yarn . On the other hand, as shown in FIG. 4A, it is assumed that the surface
of the conductive cloth 20U is raised and the space at the step between the woven yarn and the
yarn is filled with the raised fibers 22. In the case where the conductive cloth 20U is not raised
because the distance between the opposing conductive cloth 20U and the conductive cloth 20L
does not occur, and a portion where the space SP is present also effectively when not raised. The
vibrator 10 is driven by a larger driving force. Further, since the vibrating body 10, the
conductive cloth 20 and the elastic member 30 are flexible, they can be deformed in an arc
shape, can be deformed along a curved surface, or can be freely deformed, and can be attached
to clothes. . Also, since each member have a flexible, there is no possibility of damaging the
human body even human body collides. For this reason, if attached to a headrest or disposed
inside a full-faced helmet, it is possible to produce sound at the ear without damaging the human
body.
[0019]
Second Embodiment Next, a second embodiment of the present invention will be described.
Electrostatic speaker 1A according to the second embodiment, the configuration and method of
stitching the members of the conductive cloth is different from the first embodiment. The other
elastic members 30, the vibrator 10, the yarn 40, the transformer 50, the input unit 60, and the
bias power supply 70 have the same configuration as in the first embodiment.
[0020]
More specifically, in the second embodiment, the conductive cloths 21U and 21L are obtained by
raising the conductive yarns in a knitted manner as shown in FIG. Conductive cloth 21U, 21L,
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because they are woven knitted, having elasticity in the X and Y directions. The conductive cloths
21U and 21L are not limited to the knit weave as long as they have stretchability in the X
direction and the Y direction, and may be, for example, rubber knit as shown in FIG. 5 (b). , As
shown in FIG. 5 (c) may be pearl knitting.
[0021]
Then, as in the first embodiment, the members are stacked in the order of the conductive cloth
21L, the elastic member 30L, the vibrator 10, the elastic member 30U, and the conductive cloth
21U, and the stacked members are sewn together with the thread 40. In the present
embodiment, when the respective members are sewn together, the conductive cloths 20U and
20L are sewn together in a state of being slightly stretched in the X direction and the Y direction.
[0022]
For example, when the conductive cloth 20 of plain weave is sewn without stretching as in the
first embodiment, when the electrostatic speaker 1 is deformed into an arc shape, the plain
weave has less stretchability compared to the knit weave, As shown in FIG. 6 (a), there is a
possibility that the portion which is not sewed with the thread on the inner peripheral side may
sag and the distance between the conductive cloths may not be constant. However, according to
the present embodiment, when the conductive cloths 21U and 21L are sewn together, the
conductive cloths 21U and 21L are stretched and sewn together. Therefore, when the conductive
cloths 21U and 21L are deformed into an arc shape, they are shown in FIG. As described above,
the conductive cloth that has been stretched on the inner circumferential side shrinks so that the
conductive cloth on the inner circumferential side does not sag, and on the outer circumferential
side, the conductive cloth stretches and is held because it is stretchy with a knit weave.
Therefore, the distance between the conductive cloths does not change significantly.
[0023]
Further, in the present embodiment, since the conductive cloths 21U and 21L are provided with
a gap between the warp and the weft so as to have stretchability, the conductive cloths 21U and
21L have better air permeability compared to the case of using a plain weave conductive cloth. ,
Sound transmission becomes better.
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8
[0024]
[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.
[0025]
In the electrostatic loudspeaker according to the present invention, the seams are along the sides
of the electrostatic loudspeaker 1, but may be along diagonal lines as shown in FIG. In the
electrostatic speaker according to the present invention, the elastic member 30 is not limited to
the batting. It may deform when force is applied, return to its original shape when the applied
force is removed, and it may be another member as long as it has insulation and acoustic
transparency. Further, in the present invention, the shapes of the conductive cloth, the elastic
member and the vibrator are not limited to rectangular, but may be other shapes such as
polygon, circle, oval and the like. Further, in the present invention, in order to prevent an electric
shock or a short circuit, the whole of the electrostatic speaker 1 may be covered with a nonconductive and sound-permeable cloth.
[0026]
The conductive fabric of the present invention, only one of the warp or weft may also be a yarn
having conductivity. Further, in the warp and weft of the conductive cloth, it is possible to weave
conductive yarns every few yarns, instead of using all conductive yarns. In the present invention,
a conductive non-conductive yarn may be woven, and after raising the woven cloth, a conductive
metal may be plated to form a conductive cloth. The conductive fabric of the present invention
may be those woven conductive filaments. The conductive fabric of the present invention may be
a nonwoven fabric as long as has conductivity. Moreover, in the embodiment described above,
the conductive cloth is raised only on one side, but both the front and back surfaces may be
raised.
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[0027]
In the present invention, a conductive cloth may be formed by bonding a knitted fabric in which
yarns having insulation properties are knitted with a mesh fabric in which conductive yarns are
meshed and raised using an adhesive or the like. Then, the mesh cloth side of the conductive
cloth may be superimposed on the elastic member 30 side and sewn with the thread 40 to
constitute an electrostatic speaker. In addition, after the knit cloth is disposed outside and the
mesh cloth is disposed between the knit cloth and the elastic member 30, the electrostatic
speaker may be configured by sewing with the thread 40. In the structure in which the knitted
fabric and the mesh fabric are sewn without being bonded to each other, the members may be
sewn together with the yarn 40 in a stretched state of the knitted fabric.
[0028]
In the electrostatic speaker according to the present invention, in order to ensure the strength of
the portion sewn by the thread 40, a mesh non-woven fabric 80 having a plurality of holes 81 as
shown in FIG. The mesh frame portion may be sewn with thread 40 by disposing it in between.
[0029]
In the embodiment described above, the conductive cloth 20, the vibrator 10 and the elastic
member 30 are sewn together with the thread 40, but instead of the thread 40, each member
may be restrained by a so-called tag pin formed of a synthetic resin. .
If each member is restrained by a plurality of tag pins, each member will not be displaced when
deformed as in the case where the members are sewn together with the thread 40.
[0030]
In the present invention, the sheet 90 of the thermoplastic resin shown in FIG. 9A may be
sandwiched between the members, and after the sheet is heated and pressed, it may be cooled to
restrain the members. Specifically, a rectangular frame-shaped thermoplastic resin sheet 90 is
formed between the conductive cloth 20U and the elastic member 30U, between the elastic
member 30U and the vibrator 10, between the vibrator 10 and the elastic member 30L, and
elastically. It is sandwiched between the member 30L and the conductive cloth 20L. When the
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10
portion where the sheet 90 is placed under pressure and heating, the members each other sheet
90 is melted to adhere. Thus, when by dissolving sheet 90 to bond the respective members
together, never deviate each member as if sewn with thread 40.
[0031]
Note that the sheet 90 is not in the shape of a rectangular frame-shaped, or may be a lattice-like
shape as shown in Figure 9 (b). Further, in this modification, it may be a vibrating body 10 and
the elastic member 30 as a size to fit inside the frame-shaped sheet 90. In this configuration, the
sheet 90 is stacked on the conductive cloth 20L, and the vibrating body 10 and the elastic
members 30L and 30U sandwiching the vibrating body are accommodated inside the frame
shape of the sheet 90. Then, the conductive cloth 20U is placed on the sheet 90 and the elastic
member 30U, and a portion of the sheet 90 is heated and pressed to bond the conductive cloth
20U and the conductive cloth 20L with the sheet 90. According to this configuration, it is
possible to prevent the externally exposed vibrator 10 and the elastic member 30 fits inside the
conductive fabric 20 and the seat 90.
[0032]
In place of the sheet 90, an adhesive may be applied to a plurality of points, and the members
may be adhered to each other at a plurality of points to restrain the members. In this
configuration, when the adhesive is applied to be laid on the member, a space is generated
between the members due to the thickness of the adhesive, and the adhesive can be used as a
spacer.
[0033]
In the embodiment described above, the quilting is disposed on the side opposite to the elastic
member 30U in the conductive cloth 20U, and the quilting is disposed on the side opposite to the
elastic member 30L in the conductive cloth 20L. 30 and the vibrating body 10 may be sewn
together. According to this configuration, when the electrostatic speaker is bent or broken, the
conductive cloth 20 is pushed by the swelling of the quilting, and the space between the
conductive cloth 20 and the vibrator 10 is prevented from spreading.
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[0034]
FIG. 1 is a schematic view of an electrostatic loudspeaker 1 according to an embodiment of the
present invention. Of the electrostatic speaker 1 section and the electrical configuration is a
diagram schematically showing. It is an enlarged view of the surface of conductive cloth 20U. It
is an enlarged view of a cross section of conductive cloth 20U and elastic member 30U. It is the
figure which showed the modification of the weave of conductive cloth. It is a figure showing the
cross section when making an electrostatic type speaker deformed. It is a schematic diagram of
the electrostatic-type speaker which concerns on the modification of this invention. It is the
figure which showed the external appearance of the nonwoven fabric which concerns on the
modification of this invention. It is an outline view of sheet 90 concerning the modification of the
present invention.
Explanation of sign
[0035]
DESCRIPTION OF SYMBOLS 1 ... Electrostatic type speaker, 10 ... Vibrator, 20U, 20L, 21U, 21L ...
Conductive cloth, 30U, 30L ... Elastic member, 40 ... Yarn, 50 ... Transformer 60: input part 70:
bias power supply 80: non-woven fabric
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