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JP2011077663

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DESCRIPTION JP2011077663
To provide an electrostatic speaker capable of delivering sound to a listener even if there is a
member on the surface of which an image is formed. In the electrostatic speaker 1, surface
members 80U and 80L are provided on the outermost side among the stacked members. The
surface member 80U is a cloth, and characters, pictures, photographs, etc. are printed on the
surface. In the electrostatic loudspeaker 1, the sound generated by the vibration of the vibrating
body 10 passes through the cushion members 40 and 40L and the electrodes 20U and 20L.
Further, since the surface members 80U and 80L are cloths and sound passes through, the sound
passing through the electrodes 20U and 20L passes through the surface members 80U and 80L
and is emitted to the outside of the electrostatic speaker 1. [Selected figure] Figure 2
Electrostatic speaker
[0001]
The present invention relates to an electrostatic speaker.
[0002]
There is an electrostatic speaker as a thin speaker.
As disclosed in Patent Document 1, an electrostatic speaker is a sheet having two parallel flat
electrodes facing each other at intervals and a conductive sheet disposed under tension between
the two electrodes. When a predetermined bias voltage is applied to the vibrating body and the
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voltage applied to the electrodes is changed, the electrostatic force acting on the vibrating body
is changed, whereby the vibrating body is Displace. If this applied voltage is changed according
to the acoustic signal to be input, the vibrator repeats displacement (i.e. vibrates) accordingly,
and an acoustic wave corresponding to the acoustic signal is generated from the vibrator. Then,
the generated acoustic wave is radiated to the outside through the hole formed in the flat
electrode. In addition, as an electrostatic speaker that is flexible and can be folded or bent, there
is an electrostatic speaker disclosed in Patent Document 2. In this electrostatic speaker, an
aluminum-deposited polyester film (vibrating body) is sandwiched between two sheets of cloth
(electrodes) woven with conductive yarn, and an ester is formed between the film and the cloth.
Wool is placed.
[0003]
JP-A-7-46697 JP-A 2008-54154
[0004]
Since the electrostatic speaker can be made thin and plate-like, it can be arranged
inconspicuously on a wall or the like as compared to a speaker having an enclosure, and further
behind the poster etc. so as not to be inconspicuous on the wall If arranged, the speaker can be
arranged without the viewer of the poster noticing that the speaker is present.
However, if the air does not pass from the front to the back as in a poster, that is, it is located in
front of the speaker that does not allow sound to pass, the sound emitted from the speaker is
blocked by the poster and the sound is It can not be heard clearly.
[0005]
The present invention has been made under the above-described background, and it is an object
of the present invention to provide an electrostatic speaker capable of delivering sound to a
listener even if there is a member on the surface of which an image is formed. .
[0006]
In order to solve the problems described above, the present invention provides a first electrode
having conductivity, a second electrode having conductivity, and a second electrode arranged to
face the first electrode with a distance, and conductivity. A vibrator disposed at a distance from
the first electrode and the second electrode between the first electrode and the second electrode,
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and opposed to the vibrator of the first electrode Provided is an electrostatic speaker having a
surface member located on the side opposite to the side and having an image formed on the side
opposite to the side on the side of the first electrode and through which sound passes.
[0007]
In the present invention, the first electrode and the second electrode may be cloth having
conductivity.
In the present invention, the surface member may be fixed to the electrode.
[0008]
According to the present invention, even if there is a member on the surface of which an image is
formed, sound can be delivered to the listener.
[0009]
FIG. 1 is an external view of an electrostatic speaker 1 according to an embodiment of the
present invention.
It is the sectional view on the AA line of FIG.
FIG. 2 is an exploded view of the electrostatic speaker 1; FIG. 6 is an external view of a concave
member 110.
[0010]
Embodiment FIG. 1 is an external view of an electrostatic speaker 1 according to an embodiment
of the present invention, and FIG. 2 is a diagram showing a cross section along line A-A of the
electrostatic speaker 1 and an electrical configuration. FIG. 3 is an exploded perspective view of
the electrostatic speaker 1. In the figure, the directions are indicated by the orthogonal X-axis, Y-
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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. Also, the dimensions of each component in the figure are different
from the actual dimensions so that the shape of the component can be easily understood.
[0011]
As shown in the figure, this electrostatic speaker 1 has a vibrator 10, electrodes 20U and 20L,
spacers 30U and 30L, and cushion members 40U and 40L. Further, the electrostatic speaker 1
has surface members 80U and 80L. In the present embodiment, the configurations of the
electrode 20U and the electrode 20L are the same, and the configurations of the spacer 30U and
the spacer 30L are the same. Further, the configurations of the cushion material 40U and the
cushion material 40L are the same, and the configurations of the surface member 80U and the
surface member 80L are also the same. For this reason, in the following description, when there
is no particular need to distinguish between each member with "U" attached to the symbol and
one with "L" attached to the symbol, "L" and "U" Description is omitted.
[0012]
(Configuration of Each Part of Electrostatic Speaker 1) First, the configuration of each part
constituting the electrostatic speaker 1 will be described. The vibrating body 10 is a film
(substrate) made of PET (polyethylene terephthalate, polyethylene terephthalate) or PP
(polypropylene, polypropylene) or the like, on both sides of which a conductive metal is
deposited or a conductive paint is applied. The thickness is about several micrometers to several
tens of micrometers, and the shape is rectangular. In the present embodiment, the vibrating body
10 is formed by vapor deposition of a conductive metal or coating of a conductive paint on both
sides of a film, but deposition of a conductive metal on only one side of a film is performed. It
may be coated with a conductive paint. The vibrating body 10 is not limited to PET or PP, and
may be a film of another synthetic resin on which a conductive metal is deposited or a
conductive paint is applied.
[0013]
The spacer 30 is formed of plastic, which is an insulator, and its shape is a rectangular frame. In
the present embodiment, the lengths of the spacer 30 in the X-axis direction and the Y-axis
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direction and the lengths of the electrode 20 in the X-axis direction and the Y-axis direction are
the same, and the Z axis of the spacer 30U and the spacer 30L is The heights of the directions
are all the same. Also, the spacer 30 is flexible and can be bent and bent. The cushioning material
40 is formed by applying heat to cotton and compressing it so that air and sound can pass, and
its shape is rectangular. The cushioning material 40 is insulating and elastic, and deforms when
an external force is applied, and returns to its original shape when an external force is removed.
[0014]
The electrode 20 is formed by depositing a conductive metal (for example, aluminum) on one
side of a PET sheet (base material) or applying a conductive paint, and has a rectangular shape
and penetrates from the front surface to the back surface. A plurality of holes 21 are provided. In
addition, since the electrode 20 is formed of a sheet of PET, it has flexibility and can be bent and
bent. In the present embodiment, the lengths in the X-axis direction and the Y-axis direction of
the electrode 20 are longer than the lengths in the X-axis direction and the Y-axis direction of the
vibrating body 10. Moreover, although the metal which has electroconductivity is vapordeposited on the single side | surface of the electrode 20 in this embodiment, the metal which
has electroconductivity on both surfaces may be vapor-deposited or the electroconductive paint
may be apply | coated. The electrode 20 is not limited to PET, and may be a sheet of another
synthetic resin on which a conductive metal is deposited or coated with a conductive paint.
[0015]
The surface member 80 is a cloth in the present embodiment, and an image such as a character,
a picture, or a photograph is formed on the surface. In the present embodiment, a picture 85 is
printed as shown in FIG. The surface member 80 allows air to pass, and the sound passes from
one side to the other side. The lengths of the surface member 80 in the X-axis direction and the
Y-axis direction are the same as the lengths of the electrode 20 in the X-axis direction and the Yaxis direction.
[0016]
(Structure of Electrostatic Speaker 1) Next, the structure of the electrostatic speaker 1 will be
described. In the electrostatic loudspeaker 1, the spacer 30U and the spacer 30L are fixed to
each other between the lower surface of the spacer 30U and the upper surface of the spacer 30L
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with one side of the vibrating body 10 interposed therebetween. In the electrostatic speaker 1,
the electrode 20L is fixed to the lower surface of the spacer 30L with the surface on which the
conductive metal is vapor-deposited facing the vibrating body 10, and the electrode 20U is a
conductive metal. It adheres to the upper surface of the spacer 30U with the vapor-deposited
surface side facing the vibrating body 10 side. Further, in the electrostatic speaker 1, the
cushioning material 40L is disposed inside the frame-shaped spacer 30L, and the cushioning
material 40L is in contact with the vibrating body 10 and the electrode 20L. Also, a cushioning
material 40U is disposed also inside the frame-shaped spacer 30U, and the cushioning material
40U is in contact with the vibrating body 10 and the electrode 20U. A surface member 80U is
fixed to the upper surface of the electrode 20U by an adhesive. Further, a surface member 80L is
fixed to the lower surface of the electrode 20L by an adhesive. The surface member 80 is coated
with an adhesive on the end in the X-axis direction and the end in the Y-axis direction (a part of a
width of several mm from the edge of the surface member 80 inward) and adhered to the
electrode 20 The inner side of the portion to which the adhesive is applied is not fixed to the
electrode 20.
[0017]
In the present embodiment, only one side of the vibrator 10 is sandwiched between the spacer
30U and the spacer 30L, and the remaining three sides are not sandwiched between the spacer
30U and the spacer 30L, that is, tension In the state where the vibration member 10 is not
driven, since the cushioning material 40U and the cushioning material 40L are supported by
sandwiching the vibrating body 10 in the state where the vibrating body 10 is not driven. The
vibrator 10 is positioned at an intermediate position between the electrode 20U and the
electrode 20L. In addition, since tension is not applied to the vibrating body 10, tension is not
applied to the vibrating body 10 even if the electrostatic speaker 1 is bent, and elongation is not
generated in the vibrating body 10.
[0018]
(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
drive unit 100 including a bias power supply 70 for applying a DC bias to the vibrator 10.
Connected Bias power supply 70 is connected to the conductive portion of vibrator 10 and the
middle point on the output side of transformer 50, and the conductive portion of electrode 20U
is on one end of the output side of transformer 50. At the other end of the output side of the
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transformer 50 connected, a conductive portion of the electrode 20L is connected. The input side
of the transformer 50 is connected to the input unit 60. 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 electrode 20, and the electrostatic speaker 1 operates as a push-pull electrostatic speaker. .
[0019]
(Operation of Electrostatic Speaker 1) Next, the operation of the electrostatic speaker 1 will be
described. When an acoustic signal is input to the input unit 60, a voltage corresponding to the
input acoustic signal is applied from the transformer 50 to the electrode 20U and the electrode
20L. Then, when a potential difference is generated between the electrode 20U and the electrode
20L by the applied voltage, the vibrator 10 between the electrode 20U and the electrode 20L is
drawn to either side of the electrode 20U or the electrode 20L. Such electrostatic force works.
[0020]
When an acoustic signal is input to the input unit 60, this acoustic signal is supplied to the
transformer 50, a positive voltage is applied to the electrode 20U, and a negative voltage is
applied to the electrode 20L. Since a positive voltage is applied by 70, the vibrator 10 repels the
electrode 20U to which the positive voltage is applied, while being attracted to the electrode 20L
to which the negative voltage is applied, to the electrode 20L side. Displace.
[0021]
In addition, when an acoustic signal is input to the input unit 60 and this acoustic signal is
supplied to the transformer 50 and a negative voltage is applied to the electrode 20U and a
positive voltage is applied to the electrode 20L, the vibrating body 10 is positive. While being
repelled from the electrode 20L to which the voltage of (1) is applied, it is attracted to the
electrode 20U to which the negative voltage is applied, and is displaced to the electrode 20U
side.
[0022]
As described above, the vibrating body 10 is displaced (flexed) to the electrode 20U side or the
electrode 20L side according to the acoustic signal, and the displacement direction is sequentially
changed to become vibration, and the vibration state (frequency, amplitude, phase) is obtained. A
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corresponding sound is generated from the vibrator 10.
The generated sound is emitted to the outside of the electrostatic speaker 1 through the
cushioning material 40 through which the sound passes, the electrode 20 and the surface
member 80.
[0023]
In the present embodiment, the surface member 80 on which characters, pictures, photographs,
etc. are printed is located on the outermost side.
The electrostatic speaker 1 is disposed on the wall surface with the surface member 80L side
facing the wall surface, and if the surface member 80U on which an advertisement etc. for the
product is printed is located on the opposite side to the wall surface The voice of the item
description can be emitted from the part of the product picture or picture while showing the
picture or picture. In addition, about the printing performed on the surface member 80, it is not
limited to the advertisement of goods, You may print guidance signs, such as a plant | facility on
the surface member 80, and may emit the sound of guidance of a plant | facility. Further, in the
present embodiment, the electrode 20 and the vibrator 10 are lightweight by using a synthetic
resin film or sheet as a base material, the cushioning material 40 is cotton, the spacer 30 is
plastic, and these members are also lightweight It is. As described above, since the members
constituting the electrostatic speaker 1 are lightweight, the area of the electrode 20 and the
vibrating body 10 is made large, for example, a large electrostatic type having the size of one
wall surface. It can also be a speaker. In the embodiment described above, since each member is
flexible as described above, the electrostatic speaker 1 can be bent and bent. When the
electrostatic speaker 1 is bent and disposed on a curved surface, an adhesive may be applied to
the surface member 80 in a lattice shape, and a portion inside the edge may be fixed to the
electrode 20 as well. According to this configuration, even if the electrode 20 is bent, the surface
member 80 does not separate from the electrode 20 and does not loosen, and a picture, a
photograph, characters, etc. printed on the surface member 80 do not become difficult to see.
[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
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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.
[0025]
In the embodiment described above, the surface member 80 may be peeled off from the
electrode 20 and a newly printed surface member 80 may be attached. In the embodiment
described above, the surface member 80 is not limited to cloth, and may be other than cloth as
long as printing can be performed. For example, the surface member 80 may be paper, plastic
film or sheet. When a sheet or film of paper or plastic is used as the surface member 80, it is
preferable to provide a plurality of holes penetrating from one surface of the surface member 80
to the other surface. If the surface member 80 is provided with a hole, the sound passing through
the electrode 20 passes through the hole provided in the surface member 80 and is emitted to
the outside of the electrostatic speaker 1. In the embodiment described above, the electrostatic
speaker 1 includes the surface member 80L and the surface member 80U. However, only one of
the surface member 80L and the surface member 80L may be provided. Further, in the present
invention, when forming an image on the surface member 80, the present invention is not limited
to printing using ink. For example, when the surface member 80 is paper, an image may be
formed with toner. Alternatively, the surface member 80 may be irradiated with a laser to burn
the surface of the surface member 80, and characters, pictures, photographs, etc. may be drawn
on the surface member 80.
[0026]
In the electrostatic speaker according to the present invention, the electrode 20 may be a clothlike electrode in which fibers for flowing electricity are woven, or a non-woven fabric formed of
fibers for flowing electricity. When the electrode 20 is a cloth that carries electricity, the surface
member 80 may not be adhered to the electrode 20, and printing of characters, pictures,
photographs, etc. may be performed on the electrode 20.
[0027]
In the above-mentioned embodiment, although each part which constitutes electrostatic type
speaker 1 has flexibility, spacer 30 and electrode 20 do not need to be equipped with flexibility.
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For example, a punching metal provided with a plurality of through holes from the front surface
to the back surface of a metal plate capable of flowing electricity may be adopted as the
electrode 20, and even if the electrode 20 is an expanded metal or a metal mesh Good. In the
configuration in which the spacer 30 and the electrode 20 do not have flexibility and the
electrostatic speaker 1 does not bend, tension is applied to the vibrating body 10 to hold the four
sides of the vibrating body 10 between the spacer 30U and the spacer 30L. The vibrating body
10 may be fixed to the spacer 30 in this manner. Further, in such a configuration in which
tension is applied to the vibrating body 10, the cushioning material 40 may not be disposed.
[0028]
In the embodiment described above, the surface member 80 is adhered to the electrode 20 by an
adhesive, but the method of fixing the surface member 80 to the electrode 20 is not limited to
the fixing by the adhesive. For example, the surface member 80 may be adhered to the electrode
20 with a double-sided tape, or the surface member 80 may be fixed to the electrode 20 with a
surface fastener. Alternatively, the surface member 80 may be bonded to the electrode 20 with a
double-sided tape or an adhesive that can repeat bonding and peeling multiple times.
Alternatively, the surface member 80 may be attached to the electrode 20 by so-called snaps,
which are a pair of convex and concave fasteners. Further, in the embodiment described above,
the electrostatic speaker 1 includes the spacer 30, but the spacer 30 may not be provided. In the
case where the spacer 30 is not provided, adjacent members may be bonded with an adhesive, a
double-sided tape, or the like. In the case of bonding adjacent members, it is preferable not to
bond the entire surface, but to bond a portion having a constant width from the edge or in a
lattice shape.
[0029]
Further, as shown in FIG. 4, the surface member 80 may be fixed to the electrode 20 by a
concave-shaped member 110 having a concave cross section having a shape obtained by
removing one of the four surfaces constituting the square tube. The concave member 110 has a
bottom surface 110A and side surface portions 111A and 111B perpendicular to the bottom
surface, and the distance from the facing side surface portion 111A to the side surface portion
111B is from the surface of the surface member 80L to the surface member 80U. It is shorter
than the distance to the surface. Therefore, when the electrostatic speaker 1 is inserted between
the facing side surface portion 111A and the facing side surface portion 111B, the surface
member 80U is sandwiched and fixed between the side surface portion 111A and the electrode
20U. The surface member 80L is sandwiched and fixed between the portion 111B and the
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electrode 20L. According to this configuration, since the surface member 80 can be fixed to the
electrode 20 without bonding, the surface member 80 can be easily replaced if the concave
member 110 is removed from the electrostatic speaker 1.
[0030]
In the electrostatic speaker according to the present invention, the cushioning material 40 is not
limited to cotton, and may be another member (such as ester wool) as long as it has elasticity,
insulation and sound transmission. May be Further, in the electrostatic speaker according to the
present invention, the shape of each member constituting the electrostatic speaker is not limited
to a rectangular shape, and may be another shape such as a polygon, a circle, or an ellipse. Good.
[0031]
In FIGS. 1 and 3, the areas of the surface member 80 and the electrode 20 are the same, but the
area of the surface member 80U may be larger than the area of the electrode 20U, and the area
of the surface member 80U is The area may be narrower than the area of the electrode 20U.
When the area of the surface member 80U is larger than the area of the electrode 20U, the
surface member 80U is preferably a flexible member. If the area of the surface member 80 is
larger than the area of the electrode 20, even if a bracket for fixing the surface member 80 to the
wall surface is attached to the margin where the electrode 20 is not attached, the drive unit 100
to the bracket There is no signal flow from
[0032]
DESCRIPTION OF SYMBOLS 1 ... Electrostatic type speaker, 10 ... Vibrator, 20, 20 U, 20 L ...
Electrode, 30, 30 U, 30 L ... Spacer, 40, 40 U, 40 L ... Cushion material, 50 ..・ Transformer, 60 ・
・ ・ Input part, 70 ・ ・ ・ Bias power supply, 80, 80 U, 80 L ・ ・ ・ Surface member, 100 ・
・ ・ Drive part, 110 ・ ・ ・ Concave member
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