JP2012019476

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DESCRIPTION JP2012019476
An object of the present invention is to reduce the possibility of an electric shock of a human
body due to a current flowing from an electrostatic speaker. SOLUTION: A surface of a main body
portion 11 of an electrostatic speaker 1 provided with members (active parts) such as an
electrode 30 and a vibrating membrane 10 has a first cover member having elasticity and
acoustic transparency, waterproofness, insulation It is comprised by the member of three layers
of the 2nd cover member which has nature and sound transmission nature, and the 3rd cover
member which has sound transmission nature. In this configuration, since the live parts that may
cause an electric shock are covered by the insulating second cover member 50, the possibility of
the human body touching the live parts is reduced. Therefore, the possibility of an electric shock
of the human body is reduced. [Selected figure] Figure 1
Electrostatic speaker
[0001]
The present invention relates to an electrostatic speaker.
[0002]
As a flexible, foldable or bendable electrostatic speaker, for example, there is an electrostatic
speaker disclosed in Patent Document 1.
In this electrostatic speaker, a polyester film on which aluminum is vapor-deposited is
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sandwiched between two cloths woven by conductive yarns, and ester wool is disposed between
the film and the cloth. is there.
[0003]
JP 2008-54154 A
[0004]
In the speaker disclosed in Patent Document 1, the cloth that functions as an electrode is
exposed, so the cloth is easy to touch the human body, and when the human body touches the
cloth, current flows from the speaker to the human body to cause electric shock. there is a
possibility.
[0005]
The present invention has been made under the above-described background, and an object of
the present invention is to provide a technique for reducing the possibility of the human body
being shocked by the current flowing from the electrostatic speaker.
[0006]
In order to solve the problems described above, the present invention is characterized in that it is
located between an electrode having acoustic transparency, a vibrating membrane disposed
facing to the electrode, and the vibrating membrane and the electrode, and that it is elastic and
insulating. Of an elastic member having elasticity and sound transmission, a first cover member
located on the opposite side of the surface of the electrode facing the elastic member, and having
elasticity and sound transmission, and the first cover member A second cover member located on
the side opposite to the side facing the electrode and having a waterproof, insulating property,
and acoustic transparency, and a face facing the first cover member of the second cover member
And a third cover member located on the opposite side of the side and having sound
transparency.
[0007]
In the present invention, the second cover member has a conductive film formed on the entire
surface of at least one surface of the second cover member, and the conductive film is connected
to the ground of a drive circuit that supplies an acoustic signal to the electrode. May be
electrically connected.
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[0008]
Further, in the present invention, the first cover member is disposed so as to sandwich the
electrode, the elastic member, and the vibrating membrane, and the electrode, the elastic
member, and the elastic member are disposed in a space between the first cover members. The
edges of the first cover member are fixed to each other in a state in which the diaphragm is
disposed, and the second cover member is disposed so as to sandwich the electrode, the elastic
member, the diaphragm, and the first cover member. With the electrode, the elastic member, the
vibrating membrane, and the first cover member arranged in the space between the second cover
members, the edges of the second cover member are fixed, and the third cover member Are
disposed on both sides of the electrode, the elastic member, the vibrating film, the first cover
member, and the second cover member, and the electrode, the elastic member, the front in the
space between the third cover members. Vibrating membrane, the edges between the said third
cover member may be a configuration that is fixed in a state where the first cover member and
the second cover member is arranged.
[0009]
According to the present invention, it is possible to reduce the possibility of the human body
being shocked by the current flowing from the electrostatic speaker.
[0010]
FIG. 1 is an external view of an electrostatic speaker according to an embodiment of the present
invention.
It is sectional drawing of an electrostatic type speaker.
It is an exploded perspective view of an electrostatic type speaker.
It is an enlarged view of the surface of the 3rd cover member.
It is the figure which showed the electric constitution of the electrostatic-type speaker.
It is a figure showing the electric composition of the electrostatic type speaker concerning the
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modification of the present invention.
It is a figure which illustrates the field to which the adhesive concerning a modification of the
present invention was applied.
It is a figure which illustrates the field to which the adhesive concerning a modification of the
present invention was applied. It is a figure which illustrates the field to which the adhesive
concerning a modification of the present invention was applied. It is a figure which illustrates the
field of the 1st cover member to which the adhesive concerning this modification was applied. It
is an external view of the electrostatic-type speaker which concerns on the modification of this
invention. It is sectional drawing of the electrostatic-type speaker which concerns on the
modification of this invention. It is an external view of the electrostatic-type speaker which
concerns on the modification of this invention.
[0011]
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 cross-sectional view of the electrostatic speaker 1. FIG. 3
is an exploded perspective view of the electrostatic speaker 1. In these figures, the directions are
indicated by the orthogonal X-axis, 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. Here, front is a representation of the
direction of the surface for the sake of convenience, and does not represent that it faces in the
front direction when the electrostatic speaker 1 is disposed. The electrostatic speaker 1 may be
arranged in any orientation as needed. 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.
[0012]
(Configuration of Each Part of Electrostatic Loudspeaker 1) The electrostatic loudspeaker 1 is
roughly divided into a main body 11 and a cover member 12. First, the structure of each part
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which comprises the main-body part 11 of the electrostatic type speaker 1 is demonstrated. The
main body 11 includes a vibrating membrane 10, elastic members 20U and 20L, and electrodes
30U and 30L. In the present embodiment, the configurations of the elastic members 20U and
20L are the same, and the configurations of the electrodes 30U and 30L are the same. For this
reason, when it is not necessary to distinguish both about each member, the description of "U"
and "L" is omitted.
[0013]
The vibrating film 10 is based on a film of synthetic resin having insulation and flexibility such as
PET (polyethylene terephthalate) or PP (polypropylene), and a conductive metal is formed on one
side of the film. It has a sheet-like configuration in which a conductive film is formed by vapor
deposition. The vibrating film 10 has a rectangular shape when viewed from the Z-axis direction.
[0014]
The elastic member 20 is a non-woven fabric and can pass air and sound without conducting
electricity. The elastic member 20 has elasticity, and deforms when an external force is applied,
and returns to its original shape when an external force is removed. Each elastic member 20 has
a rectangular shape when viewed from the Z-axis direction, and the dimensions in the X-axis
direction and the Y-axis direction are the same.
[0015]
The electrode 30 is made of a synthetic resin film having insulation and flexibility such as PET or
PP as a substrate, and a conductive metal is deposited on one surface of the film to form a
conductive film. . Each electrode 30 has a rectangular shape when viewed from the Z-axis
direction, and the dimensions in the X-axis direction and the Y-axis direction are the same. In
addition, the electrode 30 has a plurality of through holes penetrating from the front surface to
the back surface, so that air and sound can pass therethrough. In the drawings, the illustration of
the through holes is omitted.
[0016]
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Next, respective members constituting the cover member 12 of the electrostatic speaker 1 will be
described. The cover member 12 includes first cover members 40U and 40L, second cover
members 50U and 50L, and third cover members 60U and 60L. In the present embodiment, the
configurations of the first cover members 40U and 40L are the same, and the configurations of
the second cover members 50U and 50L are the same. The configuration of the third cover
members 60U and 60L is also the same. For this reason, when it is not necessary to distinguish
both about each member, the description of "U" and "L" is omitted. In FIG. 1, a part of the cover
member 12 is omitted for convenience of description, and a part of the main body 11 is exposed
without being covered by the cover member 12. However, in actuality, it is assumed that the
entire body portion 11 is covered with the cover member 12.
[0017]
The first cover member 40 is a non-woven fabric formed in a sheet shape, and can pass air and
sound. The first cover member 40 is elastic and deforms when an external force is applied, and
returns to its original shape when the external force is removed. Each first cover member 40 has
a rectangular shape when viewed from the Z-axis direction, and the dimensions in the X-axis
direction and the Y-axis direction are the same. The dimensions in the X-axis direction and the Yaxis direction of the first cover member 40 are longer than the dimensions in the X-axis direction
and the Y-axis direction of the vibrating membrane 10. The first cover member 40 preferably has
a dimension in the Z-axis direction of about 0.2 to 0.5 mm, and a weight per unit area (so-called
basis weight) of about 20 to 50 g per 1 m <2>.
[0018]
The second cover member 50 is a film of a synthetic resin having insulation and flexibility, such
as PET or PP. Moreover, the 2nd cover member 50 has waterproofness, and the passage of a
sound is possible. Each second cover member 50 has a rectangular shape when viewed from the
Z-axis direction, and the dimensions in the X-axis direction and the Y-axis direction are the same.
The dimensions in the X-axis direction and the Y-axis direction of the second cover member 50
are longer than the dimensions in the X-axis direction and the Y-axis direction of the first cover
member 40.
[0019]
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The third cover member 60 is a so-called wire mesh formed by weaving metal wires into a sheet
shape. The third cover member 60 has a rectangular shape when viewed from the Z-axis
direction. The dimensions in the X-axis direction and the Y-axis direction of the third cover
member 60 are longer than the dimensions in the X-axis direction and the Y-axis direction of the
second cover member 50. The third cover member 60 is flexible and can be bent and bent. FIG. 4
is an enlarged view of the surface of the third cover member 60. As shown in FIG. 4, the third
cover member 60 has a plurality of meshes 61. The third cover member 60 preferably has a
number of meshes of approximately 120 per 1 inch (254 mm). In such a configuration, the mesh
61 does not pass pointed objects such as a driver or a ballpoint pen.
[0020]
(Structure of Electrostatic Speaker 1) First, the structure of the main body 11 of the electrostatic
speaker 1 will be described. The vibrating membrane 10 is disposed between the lower surface
of the elastic member 20U and the upper surface of the elastic member 20L. The vibrating
membrane 10 is coated with an adhesive with a width of several mm from the edge in the X axis
direction and the edge in the Y axis direction, and is fixed to the elastic member 20U and the
elastic member 20L. The vibrating membrane 10 is not fixed to the elastic member 20U and the
elastic member 20L at a portion where the adhesive is not applied. The electrode 30U is coated
with an adhesive with a width of several mm inward from the edge in the X-axis direction and the
edge in the Y-axis direction and is fixed to the upper surface of the elastic member 20U. In
addition, the electrode 30U is not fixed to the elastic member 20U at the portion where the
adhesive is not applied. The electrode 30L is applied with an adhesive with a width of several
mm inward from the edge in the X-axis direction and the edge in the Y-axis direction and is fixed
to the lower surface of the elastic member 20L. In addition, the electrode 30L is not fixed to the
elastic member 20L at a portion where the adhesive is not applied. The electrode 30U is in
contact with the elastic member 20U at the side with the conductive film, and the electrode 30L
is in contact with the elastic member 20L at the side with the conductive film. As described
above, the main body 11 includes the vibrating membrane 10, the elastic member 20, and the
electrode 30.
[0021]
Next, the structure of the cover member 12 of the electrostatic speaker 1 will be described. In the
first cover member 40L, an adhesive is applied to a region having a width of several mm inward
from the edge in the X-axis direction and the edge in the Y-axis direction. Hereinafter, the area to
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which the adhesive is applied is referred to as an adhesion area 401L. On the other hand, in the
first cover member 40L, the adhesive is not applied to the area excluding the adhesion area
401L, that is, the area having a rectangular shape as viewed from the Z-axis direction.
Hereinafter, the area to which the adhesive is not applied is referred to as a non-adhesive area
402L. Then, when the electrostatic loudspeaker 1 is formed, the main body 11 is disposed in the
non-adhesion area 402L, and the first cover member 40U is adhered to the adhesion area 401L.
That is, the main body portion 11 is covered by the first cover member 40U and the first cover
member 40L, and is put therein. Hereinafter, a state in which an object is covered by another
object and is contained therein is referred to as "including".
[0022]
In the second cover member 50L, an adhesive is applied to a region (adhesive region 501L)
having a width of several mm inward from the edge in the X-axis direction and the edge in the Yaxis direction. On the other hand, in the second cover member 50L, the adhesive is not applied to
the area excluding the adhesion area 501L, that is, the area (non-adhesion area 502L) having a
rectangular shape as viewed from the Z-axis direction. Then, when the electrostatic speaker 1 is
formed, the first cover member 40 including the main body 11 is disposed in the non-bonding
area 502L, and the second cover member 50U is fixed to the bonding area 501L. That is, the first
cover member 40 containing the main body 11 is contained in the second cover member 50U
and the second cover member 50L.
[0023]
In the third cover member 60L, an adhesive is applied to a region (adhesive region 601L) having
a width of several mm inward from the edge in the X-axis direction and the edge in the Y-axis
direction. On the other hand, in the third cover member 60L, the adhesive is not applied to the
area excluding the adhesion area 601L, that is, the area (non-adhesion area 602L) having a
rectangular shape as viewed from the Z-axis direction. Then, when the electrostatic speaker 1 is
formed, the second cover member 50 including the main body portion 11 and the first cover
member 40 is disposed in the non-adhesive area 602L, and the third cover member 60U is
disposed in the adhesive area 601L. It is fixed. That is, the second cover member 50 including
the main body portion 11 and the first cover member 40 is included in the third cover member
60U and the third cover member 60L.
[0024]
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(Electrical Configuration of Electrostatic Speaker 1) Next, the electrical configuration of the
electrostatic speaker 1 will be described. FIG. 5 is a diagram showing an electrical configuration
of the electrostatic speaker 1. The drive unit 100 is connected to the electrostatic speaker 1. The
drive unit 100 includes a transformer 110, an amplifier 120, and a bias power supply 130. The
amplifier 120 amplifies and outputs the acoustic signal input to one terminal on the input side.
Also, the other terminal of the input side of the amplifier 120 is grounded. The terminal T1 on
the input side of the transformer 110 is connected to the amplifier 120 via the resistor R1. The
other terminal T2 of the input side of the transformer 110 is connected to the amplifier 120 via a
resistor R2. The terminal T4 on the output side of the transformer 110 is connected to the
conductive part of the electrode 30U. The other terminal T5 on the output side of the
transformer 110 is connected to the conductive part of the electrode 30L. The terminal T3 at the
midpoint of the transformer 110 is connected to the ground GND which is the reference potential
of the drive circuit 100 via the resistor R3. One end of the bias power supply 130 is connected to
the vibrating membrane 10 through the resistor R4, and the other end is connected to the
ground GND which is a reference potential of the drive circuit 100. The bias power supply 130
also applies a DC bias to the vibrating film 10. In this configuration, when the voltage
corresponding to the acoustic signal input to the amplifier 120 is applied to the electrode 30, the
electrostatic speaker 1 operates as a push-pull electrostatic speaker.
[0025]
(Operation of Electrostatic Speaker 1) Next, the operation of the electrostatic speaker 1 will be
described. When an acoustic signal is input to the amplifier 120, a voltage corresponding to the
input acoustic signal is applied from the transformer 110 to the electrode 30U and the electrode
30L. Then, when a potential difference is generated between the electrode 30U and the electrode
30L by the applied voltage, the vibrating film 10 between the electrode 30U and the electrode
30L is drawn to the side of either the electrode 30U or the electrode 30L. Electrostatic force
works. For example, it is assumed that an acoustic signal is input to the amplifier 120, the
amplified acoustic signal is supplied to the transformer 110, a positive voltage is applied to the
electrode 30U, and a negative voltage is applied to the electrode 30L. Since a positive voltage is
applied to the vibrating film 10 by the bias power supply 130, the vibrating film 10 repels the
electrode 30U to which the positive voltage is applied, while the electrode 30L to which the
negative voltage is applied. It is attracted ¦ sucked and displaced to the electrode 30L side.
Further, it is assumed that an acoustic signal is input to the amplifier 120, the amplified acoustic
signal is supplied to the transformer 110, a negative voltage is applied to the electrode 30U, and
a positive voltage is applied to the electrode 30L. The vibrating membrane 10 repels the
electrode 30L to which a positive voltage is applied, and is attracted to the electrode 30U to
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which a negative voltage is applied, and is displaced to the electrode 30U side. As described
above, the vibrating membrane 10 is displaced toward the electrode 30U or the electrode 30L
according to the acoustic signal, and the displacement direction is sequentially changed to
become vibration, and the vibration state (frequency, amplitude, phase) is obtained. An acoustic
wave is generated from the diaphragm 10. The generated acoustic wave passes through the
elastic member 20, the electrode 30, the first cover member 40, the second cover member 50
and the third cover member 60 and is radiated to the outside of the electrostatic speaker 1.
[0026]
According to the present embodiment, members such as the electrode 30 and the vibrating film
10 that may have a risk of electric shock (hereinafter referred to as active power units) are
included in the second cover member 50 having insulation and waterproofness. Therefore, the
possibility that the live part is exposed to the outside or the liquid reaches the live part is low.
That is, when the second cover member 50 includes the live part, the possibility of an electric
shock of the human body can be reduced. In addition, the second cover member 50 is included in
the third cover member 60 which does not allow a pointed object such as a driver or a ballpoint
pen to be broken by the pointed object, and the active part is exposed to the outside. And the
possibility of liquid reaching the active part is reduced. In addition, the film of the synthetic resin
forming the second cover member 50 has higher insulation than, for example, materials such as
non-woven fabric and cloth. Therefore, the dimension (thickness) in the Z-axis direction of the
second cover member 50 can be thinner if the second cover member 50 is formed using a
synthetic resin film than a non-woven fabric or a cloth.
[0027]
Moreover, according to the present embodiment, the first cover member 40 can pass air and
sound, and has the predetermined thickness, thereby separating the second cover member 50
and the electrode 30. That is, the first cover member 40 can be a space for propagating the
acoustic wave generated from the vibrating membrane 10. Therefore, the electrostatic speaker 1
has a lower degree of changing the acoustic characteristics (amplitude, phase) of the acoustic
wave generated from the vibrating film 10 as compared with the configuration in which the first
cover member 40 is not provided. Further, according to the present embodiment, since the
electrostatic speaker 1 is made of a member that can be deformed when an external force is
applied, it can be bent and bent.
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[0028]
MODIFIED EXAMPLE The embodiment described above is only an example of implementation of
the present invention. The present invention can also be implemented in the mode which applied
the following modification to embodiment mentioned above. In addition, the modification shown
below may be implemented combining each suitably as needed.
[0029]
(Modification 1) The vibrating membrane is not limited to one having a conductive metal
deposited on one surface of the film, and may have one having a conductive metal deposited on
both sides of the film. Further, the vibrating film is not limited to PET or PP, and may be a film of
another synthetic resin on which a metal having conductivity is vapor-deposited. (Modification 2)
The elastic member is not limited to a non-woven fabric, and may be a member having insulation,
sound transmission, and elasticity, for example, a material obtained by compressing heat with a
batt, a woven cloth The synthetic resin may be spongy. (Modification 3) An electrode is not
limited to what vapor-deposited the metal which has electroconductivity in one side of a film, You
may vapor-deposit metal which has electroconductivity on both surfaces of a film. The electrode
is not limited to a film, and may be a conductive, elastic sound transmitting member, for example,
a cloth made of conductive yarn.
[0030]
(Modification 4) The first cover member is not limited to the non-woven fabric, and may be a
member having elasticity and capable of passing air and sound, for example, a material obtained
by compressing heat with a batt, woven It may be a cloth, a resin mesh or the like. The third
cover member is not limited to a wire mesh, and can pass air and sound, as long as it is a member
having elasticity, for example, a material obtained by compressing heat and compressing it, a
woven cloth, a resin mesh Or the like. The second cover member is a sheet of a synthetic resin
film having insulation and flexibility such as PET or PP as a base material, and a conductive metal
(for example, aluminum) deposited on the surface of the film to form a conductive film It may be
configured as a letter. The second cover member 50a formed in this manner is waterproof, and
the rate of passage of steam is low.
[0031]
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When the second cover member has conductivity, the electrostatic speaker may be configured as
follows. FIG. 6 is a diagram showing an electrical configuration of an electrostatic speaker 1a
according to a modification of the present embodiment. In the description of FIG. 6, the
description of each member in common with FIG. 5 is omitted. As shown in the figure, a drive
unit 100a is connected to the electrostatic speaker 1a. At this time, the second cover member
50Ua and the second cover member 50La are connected to the ground GND which is the
reference potential of the drive circuit 100. That is, since the second cover member 50Ua and the
second cover member 50La have the same potential, no current is supplied. Therefore, even if
the human body touches the second cover member 50, there is no electric shock.
[0032]
(Modification 5) In the embodiment described above, the edges of the cover member are fixed by
the adhesive applied to the edge of the cover member 12, but the method of fixing and the region
to be fixed are not limited thereto. For example, FIG. 7, FIG. 8, and FIG. 9 are diagrams illustrating
areas to which the adhesive according to the present modification is applied. In FIG. 7, a region
(first bonding region 501Lb) having a width of several mm from the edge in the X axis direction
and the edge in the Y axis direction of the second cover member 50Lb, and in the X axis direction
and the Y axis direction An adhesive is applied to lattice-like regions (second bonding regions
502Lb) having predetermined intervals. In addition, it is preferable that a predetermined space ¦
interval be about 20 mm, for example. On the other hand, in the second cover member 50Lb, the
adhesive is not applied to the area excluding the first adhesion area 501Lb and the second
adhesion area 502Lb. When forming the electrostatic loudspeaker, a part of the first cover
member including the main body is fixed to the second bonding area 502Lb, and the second
cover member 50U is fixed to the first bonding area 501Lb.
[0033]
In FIG. 8, a region (first bonding region 501Lc) having a width of several mm inward from the
edge in the X axis direction and the edge in the Y axis direction of the second cover member
50Lc, and a predetermined distance in the Y axis direction An adhesive is applied to a plurality of
rectangular regions (second bonding regions 502Lc) having the same. In addition, it is preferable
that a predetermined space ¦ interval be about 20 mm, for example. On the other hand, in the
second cover member 50Lc, the adhesive is not applied to the area excluding the first adhesion
area 501Lc and the second adhesion area 502Lc. When forming the electrostatic loudspeaker, a
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part of the first cover member including the main body is fixed to the second bonding area
502Lc, and the second cover member 50U is fixed to the first bonding area 501Lc.
[0034]
In FIG. 9, a region (first bonding region 501Ld) having a width of several mm from the edge in
the X axis direction and the edge in the Y axis direction of the second cover member 50Ld, and in
the X axis direction and the Y axis direction An adhesive is applied to a plurality of dot-like
regions (second bonding regions 502Ld) arranged at predetermined intervals. In addition, it is
preferable that a predetermined space ¦ interval be about 20 mm, for example. On the other
hand, on the surface of the second cover member 50Ld, the adhesive is not applied to the area
excluding the first adhesion area 501Ld and the second adhesion area 502Ld. When forming the
electrostatic loudspeaker, a part of the first cover member including the main body is fixed to the
second bonding area 502Ld, and the second cover member 50U is fixed to the first bonding area
501Ld. In addition, although only the 2nd cover member is illustrated in Drawing 7, Drawing 8,
and Drawing 9, adhesives may be applied to the same field also about the 1st cover member and
the 3rd cover member.
[0035]
By fixing the members to which the adhesive is applied as shown in FIG. 7, FIG. 8 and FIG. 9, the
positions of the adjacent members are not relatively shifted. Also, by fixing the partial regions of
each member, the degree of changing the acoustic characteristics (amplitude, phase) of the
acoustic wave generated from the vibrating film is lower than in the case where the entire region
of each member is fixed. Become.
[0036]
When the first cover member is formed of resin mesh, the second cover member may be fixed by
the adhesive applied to the first cover member. FIG. 10 is a view illustrating the area of the first
cover member to which the adhesive according to the present modification is applied. In the first
cover member 40Lg formed of resin mesh, a region (first bonding region 401Lg) having a width
of several mm from the edge in the X axis direction and the edge in the Y axis direction, and the
X axis direction and the Y axis An adhesive is applied to lattice-like regions (second adhesive
regions 402Lg) having predetermined intervals in the direction. In addition, it is preferable that a
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predetermined space ¦ interval be about 20 mm, for example. And the surface of the 2nd cover
member adheres to the 1st adhesion field 401Lg and the 2nd adhesion field 402Lg. The second
cover member and the third cover member may be fixed by applying an adhesive to the adhesion
regions illustrated in FIGS. 3, 7, 8, and 9.
[0037]
In the electrostatic speaker, adjacent members may be fixed not by an adhesive but by a doublesided tape or a hot melt adhesive. In the case of fixing with a double-sided tape, it is preferable to
fix a portion having a constant width from the edge or in a grid shape, instead of fixing the entire
surfaces of adjacent members. In the case of fixing with a hot melt adhesive, it is preferable not
to fix the entire surfaces of adjacent members but to fix a portion having a certain width from the
edge.
[0038]
(Modification 6) In the embodiment mentioned above, although the cover member was provided
with the 1st cover member, the 2nd cover member, and the 3rd cover member, it may be further
equipped with another member. FIG. 11 is an external view of an electrostatic speaker 1e
according to a modification of the present invention, and FIG. 12 is a cross-sectional view of the
electrostatic speaker 1e according to the modification of the present invention. The cover
member 12e of the electrostatic loudspeaker 1e includes first cover members 40U and 40L,
second cover members 50U and 50L, third cover members 60U and 60L, and fourth cover
members 70Ue and 70Le. The fourth cover member 70Ue and the fourth cover member 70Le
include the electrostatic speaker 1 shown in FIG. 1 to constitute an electrostatic speaker 1e
shown in FIG. Therefore, in the description of the electrostatic speaker 1e shown in FIG. 11, the
description of the members and configurations common to those of the electrostatic speaker 1
shown in FIG. 1 will be omitted.
[0039]
The fourth cover members 70Ue and 70Le are woven cloths and have sound transparency and
flexibility. Further, the fourth cover members 70Ue and 70Le have a rectangular shape when
viewed from the Z-axis direction, and the dimensions in the X-axis direction and the Y-axis
direction are the same. The dimensions of the fourth cover members 70Ue and 70Le in the X-
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axis direction and the Y-axis direction are longer than the dimensions of the third cover member
60 in the X-axis direction and the Y-axis direction. In addition, the fourth cover members 70Ue
and 70Le can form an image such as characters, pictures, and photographs on the surface. In the
present modification, the image 71e is printed on the upper surface of the fourth cover member
70Ue. In the electrostatic loudspeaker 1e configured in this manner, the fourth cover members
70Ue and 70Le on which an image is printed on the outermost side are located. Therefore, it
becomes possible to radiate the acoustic wave related to the image printed on the surface of the
fourth cover members 70Ue and 70Le from the surface of the fourth cover members 70Ue and
70Le. The fourth cover member is not limited to a woven cloth, and may be a paper having sound
transparency and flexibility. In addition, the paper used as the fourth cover member may have
sound permeability improved by providing a through hole penetrating from the front surface to
the back surface.
[0040]
(Modification 7) In the embodiment mentioned above, the main-body part was enclosed by the
cover member. However, the cover member may be fixed to the electrode of the main body. FIG.
13 is an external view of an electrostatic speaker 1 f according to this modification. In addition,
description is abbreviate ¦ omitted in the common point of electrostatic type speaker 1 and
electrostatic type speaker 1f, and only a different point is demonstrated. The first cover member
40, the second cover member 50, and the third cover member 60 have a rectangular shape when
viewed from the Z-axis direction, and the dimensions in the X-axis direction and the Y-axis
direction are the X-axis direction and the electrode 30 It is the same as the dimension in the Yaxis direction. The first cover member 40U has an adhesive applied to the edge in the X-axis
direction and the edge in the Y-axis direction and is fixed to the upper surface of the electrode
30U, and the first cover member 40L has an edge in the X-axis direction and the Y-axis direction
An adhesive is applied to the edge and fixed to the lower surface of the electrode 30L. The
second cover member 50U has an adhesive applied to the edge in the X-axis direction and the
edge in the Y-axis direction and is fixed to the upper surface of the first cover member 40U, and
the second cover member 50L has an edge and Y in the X-axis direction. An adhesive is applied
to the axial edge and fixed to the lower surface of the first cover member 40L. The third cover
member 60U has an adhesive applied to the edge in the X axis direction and the edge in the Y
axis direction and is fixed to the upper surface of the second cover member 50U, and the third
cover member 60L has an edge in the X axis direction and Y An adhesive is applied to the axial
edge and fixed to the lower surface of the second cover member 50L. In addition, between each
member, the part inside the part to which the adhesive agent was apply ¦ coated is in the state
which is not adhering. Also in this modification, since the surface of the electrode 30 which may
cause an electric shock is covered by the insulating second cover member 50, the possibility of
an electric shock of the human body can be reduced.
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[0041]
(Modification 8) In the embodiment described above, a so-called push-pull type electrostatic
speaker including two electrodes and one vibrating membrane is used, but one electrode and one
vibrating membrane A so-called single-type electrostatic speaker may be used. The point is that
an electric field that changes according to the acoustic signal is formed, the charged vibrating
film is displaced by electrostatic force from this electric field, and the direction of displacement is
changed by successive changes to become vibration, and its vibration state (frequency, It is
sufficient that the sound according to the amplitude, the phase) is generated from the diaphragm.
[0042]
(Modification 9) In the embodiment described above, the shape of each member constituting the
electrostatic speaker is not limited to a rectangle, and may be another shape such as a polygon, a
circle, or an ellipse. .
[0043]
(Modification 10) In the embodiment described above, the first cover member 40U and the first
cover member 40L contain the main body 11, but one main body may be contained by one first
cover member.
More specifically, even if the first cover member covers the whole of the main body and the main
body is disposed in the space between the first cover members, the edges of the first cover
members are fixed to each other. Good. In addition, like the first cover member, the entire first
cover member including the main body portion is covered with one second cover member, and
the first cover includes the main body portion in the space between the second cover members.
The edges of the second cover member may be fixed with the members arranged. Further, as in
the first cover member, the entire second cover member including the first cover member is
covered with the third cover member 1, and the first cover member is included in the space
between the third cover members. The edges of the third cover member may be fixed in a state in
which the second cover member is disposed.
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[0044]
DESCRIPTION OF SYMBOLS 1 ... Electrostatic type speaker, 11 ... Body part, 10 ... Vibrating film,
20 ... Elastic member, 30 ... Electrode, 12 ... Cover member, 40 ... 1st cover member, 401 ...
Bonding area, 402 ... Non-bonding area, 50 ... 2nd cover member, 501 ... adhesion area, 502 ...
non adhesion area, 60 ... third cover member, 601 ... adhesion area, 602 ... non adhesion area, 71
e ... image, 100 ... drive part, 110 ... transformer, 120 ... amplifier, 130 ... bias power supply, 61 ...
mesh
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