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JP2010068053

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2010068053
An object of the present invention is to prevent a solid or liquid from reaching the vibrator from
the outside. In the electrostatic speaker 1, surface members 90U and 90L are provided on the
outermost side among the stacked members, and the diameter of the through hole 91 of the
surface members 90U and 90L is small. Even if a rod-like object or a pointed object collides, it
does not easily enter the inside of the electrostatic speaker 1, and the possibility of breakage of
the vibrating body 10 is reduced. Further, in this configuration, the water repellent members 80U
and 80L are provided outside the electrodes 20U and 20L, and the liquid is repelled by the water
repellent members 80U and 80L even if the liquid is applied to the surface members 90U and
90L. The risk of the liquid reaching the 20 L and the vibrating body 10 is reduced. [Selected
figure] Figure 1
Electrostatic speaker
[0001]
The present invention relates to an electrostatic speaker.
[0002]
There is an electrostatic speaker disclosed in Patent Document 1 as an electrostatic speaker
having moisture resistance.
This electrostatic speaker has a fixed electrode layer which has conductivity and is opposed to
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sandwiching a diaphragm, a diaphragm which is sandwiched between vibrators, and a water
repellent layer which prevents water from penetrating toward the diaphragm. Have. According to
this configuration, even if water is splashed on the electrostatic speaker, the water repellent layer
prevents the water from reaching the vibrating film, thereby protecting the vibrating film from
moisture and damaging the electrostatic speaker. You can prevent.
[0003]
JP, 2006-148612, A
[0004]
By the way, as a cause which a damage generate ¦ occur ¦ produces in an electrostatic type
speaker, not only water ¦ moisture content but an thing may collide and damage from the
outside.
In particular, since the vibrating body is formed so thin that it is easily broken, when an object
from the outside collides with the electrostatic speaker and reaches the vibrating body, the
vibrating body is broken and it becomes impossible to emit sound. .
[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 preventing solids and liquids from reaching
the vibrator from the outside.
[0006]
In order to solve the problems described above, the present invention has a first electrode having
conductivity, a second electrode having conductivity, and a second electrode spaced apart from
the first electrode, and having conductivity. A vibrating body disposed between the first electrode
and the second electrode and spaced apart from the first electrode and the second electrode, and
a surface side opposite to the vibrating body of the first electrode A first water repellent member
located on the side and having water repellency and sound permeability, and a plurality of
through holes located on the side opposite to the side of the first electrode facing the vibrating
body and through which sound passes And a first surface member that prevents passage of at
least a solid.
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[0007]
In the present invention, the first surface member may be configured to have water repellency.
Further, in the present invention, a first cushion material positioned between the vibrator and the
first electrode and having insulating properties, elasticity, water repellency, and acoustic
transparency, the vibrator, and the second electrode And a second cushion material having
insulating properties, elasticity, water repellency, and sound permeability.
In the present invention, a second water repellent member, which is located on the side opposite
to the side of the second electrode facing the vibrating body, and has water repellency and sound
permeability, and the second electrode described above It may be configured to be provided with
a plurality of through holes that are located on the side opposite to the surface side facing the
vibrating body and through which sound passes, and at least a second surface member that
blocks the passage of solids.
[0008]
According to the present invention, it is possible to prevent solids and liquids from reaching the
vibrator from the outside.
[0009]
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. 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 water repellent members
80U and 80L and surface members 90U and 90L. In the present embodiment, the configurations
of the electrodes 20U and 20L are the same, and the configurations of the spacers 30U and 30L
are the same. Further, the configurations of the cushion members 40U and 40L are the same, the
configurations of the water repellent members 80U and 80L are the same, and the configurations
of the surface members 90U and 90L are the same. For this reason, in the following description,
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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. 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. Further, in the drawings, those in which •
is described in o means an arrow directed from the front to the back of the drawing.
[0010]
(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, for example,
one obtained by depositing a conductive metal or applying a conductive paint on both sides of a
film such as PET (polyethylene terephthalate, polyethylene terephthalate) or PP (polypropylene,
polypropylene). Has a thickness of several μm to several tens of μm and is rectangular in shape.
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.
[0011]
The spacer 30 is formed of an insulator and has a rectangular frame shape. In the present
embodiment, the lengths in the X and Y directions of the spacer 30 and the lengths in the X and
Y directions of the electrode 20 are the same, and the heights in the Z direction of the spacer
30U and the spacer 30L are , Both are 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 can pass therethrough, and its shape is rectangular. The cushioning material 40 has
insulation, elasticity and sound transmission, and deforms when an external force is applied, and
returns to its original shape when the external force is removed.
[0012]
The electrode 20 is formed by depositing a conductive metal (for example, aluminum) on one
side of a sheet of PET or applying a conductive paint, has a rectangular shape, and has a plurality
of through holes 21 penetrating from the front surface to the back surface. It is provided. In
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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 and Y directions of the electrode 20 are
longer than the lengths in the X and Y directions of the vibrating body 10. Moreover, although
the metal which has electroconductivity is vapor-deposited 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.
[0013]
The water repellent member 80 is formed by applying a water repellent finish to a textile to
apply a polymer material such as a fluorocarbon resin or a silicone resin, and has sound
permeability. Since the water repellent member 80 is subjected to the water repellent finish, the
liquid is repelled even on the front surface, and the passage of the liquid to the back surface side
is prevented. The water repellent member 80 is not limited to the one obtained by subjecting the
woven fabric to the water repellent finish, but may be a non-woven fabric in which the fibers
subjected to the water repellent finish are bonded. Further, as the fibers used in the water
repellent member 80, various fibers such as natural fibers and chemical fibers can be used.
[0014]
The surface member 90 is a plate-like metal provided with a plurality of through holes 91
penetrating from the front surface to the back surface, so-called punching metal. In the present
embodiment, the lengths in the X and Y directions of the surface member 90 and the lengths in
the X and Y directions of the electrode 20 are the same, and the thickness can be bent. It has
become. Further, the diameter of the through hole 91 is preferably 0.5 mm or less so that a
pointed object such as a driver or a ballpoint pen can not pass through. The surface member 90
preferably has an aperture ratio of 20% or more.
[0015]
(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. Here, 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 water repellent member 80U is fixed to the
upper surface of the electrode 20U, and a surface member 90U is fixed to the upper surface of
the water repellent member 80U. On the other hand, the water repellent member 80L is fixed to
the lower surface of the electrode 20L, and the surface member 90L is fixed to the lower surface
of the water repellent member 80L.
[0016]
In this configuration, the surface member 90 is on the outermost side among the stacked
members, and the diameter of the through hole 91 of the surface member 90 is small, so that a
rod-like object such as a ballpoint pen or a driver or a pointed object collides However, it is
difficult to enter the inside of the electrostatic speaker 1, and the possibility of breakage of the
vibrating body 10 is reduced. Further, in this configuration, the water repellent member 80 is
provided outside the electrode 20, and the liquid is repelled by the water repellent member 80
even if the liquid is applied to the surface member 90, so the liquid reaches the electrode 20 and
the vibrator 10 There is less risk. Further, in this configuration, since each member is flexible as
described above, the electrostatic speaker 1 can be bent and bent.
[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.
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[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 is a pushpull type including 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 vibrating body 10. It is an
electrostatic speaker. 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 metal portion (conductive
portion) of electrode 20U is the output of transformer 50. A metal portion (conductive portion) of
the electrode 20L is connected to the other end of the output side of the transformer 50
connected to one end of the side. 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.
[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]
For example, 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 the bias power supply 70, the
vibrating body 10 repels the electrode 20U to which the positive voltage is applied, and is
attracted to the electrode 20L to which the negative voltage is applied. It is displaced to the side
(opposite to the Z direction).
[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
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positive voltage is applied to the electrode 20L, the vibrating body 10 is positive. While being
repelled from the electrode 20L to which a voltage of 0 V is applied, it is attracted to the
electrode 20U to which a negative voltage is applied, and displaced toward the electrode 20U
side (Z direction).
[0022]
As described above, the vibrating body 10 is displaced in the opposite direction of the Z direction
and the Z direction (deflection) according to the acoustic signal, and the displacement direction is
sequentially changed to become vibration, and the vibration state (frequency, amplitude, A sound
corresponding to the phase) is generated from the vibrator 10.
The generated sound is emitted to the outside of the electrostatic speaker 1 through the
cushioning material 40 having an acoustic transmission, the electrode 20, the water repellent
member 80, and the surface member 90.
[0023]
As described above, in the present embodiment, there is little risk that the collided object will go
deep inside, and there is little risk that the liquid will go deep inside, so even if the electrostatic
speaker 1 is energized, There is a low risk that the collided object may enter the interior to cause
a short circuit, or the liquid may enter the interior to cause a short circuit.
[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]
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In the embodiment described above, the electrostatic speaker 1 includes the water repellent
member 80L and the surface member 90L, but may not include the water repellent member 80L
and the surface member 90L.
When the electrostatic speaker 1 having this configuration is disposed in a room, if the side with
the surface member 90U is directed to the listener and the electrode 20L side is directed to the
wall surface, the water is repelled on the side directed to the inside of the room The presence of
the member 80U and the surface member 90U prevents the impacted object from entering the
inside, while the wall on the electrode 20L side reduces the possibility of an object coming into
contact with the inside.
[0026]
In the embodiment described above, the surface member 90 is a punching metal, but the surface
member 90 may be an expanded metal or a wire mesh. In the case where expanded metal or wire
mesh is used as the surface member 90, the hole preferably has a width of 0.5 mm or less.
[0027]
In the electrostatic loudspeaker according to the present invention, the electrode 20 may be a
cloth-like electrode in which a fiber having conductivity is woven or a non-woven fabric having
conductivity. When the conductive non-woven fabric is used as the electrode 20, a plurality of
polyester filaments aligned in the Y direction are aligned on the plurality of polyester filaments
aligned in the X direction as shown in FIG. The electrode 20 may be formed by plating a
conductive metal on one side or both sides of a sheet-like non-woven fabric in which the abovementioned filaments and the Y-direction filaments are adhered by heating. In the structure in
which the electrode 20 is in the form of a cloth, the insulating member (for example, plastic) is
formed in a plate shape, and a perforated member having a plurality of through holes
penetrating from the surface to the back is used. It may be placed between
[0028]
In the embodiment described above, each part constituting the electrostatic speaker 1 has
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flexibility, but when the electrostatic speaker is fixed and disposed, the spacer 30, the electrode
20, the perforated member, and the surface The member 90 may not have flexibility. In the
configuration in which the spacer 30, the electrode 20, the apertured member, and the surface
member 90 do not have flexibility and the electrostatic speaker does not have flexibility as
described above, tension is applied to the vibrating body 10 to cause vibration. The vibrating
body 10 may be fixed to the spacer 30 by sandwiching the four sides of the body 10 between the
spacer 30U and the spacer 30L. Further, in such a configuration in which tension is applied to
the vibrating body 10, the cushioning material 40 may not be disposed.
[0029]
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.
[0030]
In the electrostatic speaker according to the present invention, the water repellent member 80 is
not limited to the one formed of fibers, and for example, it is a porous, sound-permeable porous
material subjected to water repellent finish It may be. The porous material is preferably a flexible
material that can be bent when made into a plate or sheet.
[0031]
In the cushioning material 40 of the embodiment described above, the cushioning material 40
may be subjected to water repellent finish. Further, the surface of the surface member 90 and the
perforated member described above may be subjected to water repellent finish. When the surface
of the surface member 90 or the surface of the perforated member is to be subjected to water
repellent finish, the water repellent member 80 may not be disposed. According to this
configuration, while the liquid is repelled by the water repelling process and the liquid does not
enter the through hole by the surface tension, the possibility of the liquid reaching the internal
electrode 20 and the vibrator 10 is reduced.
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[0032]
In the embodiment described above, the water repellent member 80 is fixed to the surface of the
electrode 20 and the surface member 90 is fixed to the surface of the water repellent member
80, but the arrangement positions of the water repellent member 80 and the surface member 90
are interchanged The surface member 90 may be fixed to the surface of the electrode 20, and the
water repellent member 80 may be formed on the surface of the surface member 90.
[0033]
FIG. 1 is an external view of an electrostatic speaker 1 according to an embodiment of the
present invention.
FIG. 2 is a view schematically showing a cross section and an electrical configuration of the
electrostatic speaker 1. FIG. 2 is an exploded perspective view of the electrostatic speaker 1; It is
an enlarged view of the cloth-like electrode which concerns on the modification of this invention.
Explanation of sign
[0034]
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 section, 70 · · · bias power supply, 80, 80U, 80L · · · water repellent member, 90, 90U, 90L ·
· · surface member
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