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JP2009232021

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DESCRIPTION JP2009232021
An electrostatic loudspeaker capable of securing displacement of a vibrating body while
preventing contact between an electrode and the vibrating body. A plurality of wires (40) are
fitted in grooves (31) provided in a spacer (30), stretched between frames along the X direction
of the spacer (30), and parallel to each other at a predetermined distance. It is arranged in the
direction. The vibrating body 10 is also stretched between the frames along the Y direction of the
spacer 30 so as to alternately pass the upper side and the lower side of the plurality of wires 40
arranged in the X direction. It is in a state of being supported. The vibrating body 10 is stretched
between the frames of the spacer 30 in a tensionless state, that is, in a tensionless state, but since
the plurality of wires 40 support the vibrating body 10, the vibrating body 10 can be It can be
positioned at a predetermined position in the spacer 30. [Selected figure] Figure 2
Electrostatic speaker
[0001]
The present invention relates to an electrostatic speaker.
[0002]
The electrostatic speaker disclosed in Patent Document 1 has conductivity, which is inserted
between two flat electrodes facing each other in parallel with a gap, and between the two
electrodes, and supported at both ends, etc. When a predetermined bias voltage is applied to the
vibrating body and the voltage applied to the electrodes is changed, the electrostatic force acting
on the vibrating body is changed. Is displaced.
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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 sound
signal is generated from the vibrator. Then, the generated reproduction wave is radiated to the
outside through the hole opened in the flat electrode. Moreover, as an electrostatic type speaker,
there is also a type disclosed in Patent Document 2. The electrostatic loudspeaker disclosed in
Patent Document 2 has a non-conductive elastic member between the electrode and the vibrator,
and the vibrator supports the vibrator between the electrodes.
[0003]
JP-A-59-105800 JP-A-2007-318327
[0004]
By the way, in the electrostatic type speaker disclosed in Patent Document 1, tension is applied to
the vibrating body in the extending direction to limit the displacement of the vibrating body,
thereby preventing contact between the vibrating body and the electrode.
However, strengthening the tension increases the lowest resonance frequency, while adjusting
the lowest resonance frequency makes it difficult to set the tension. On the other hand, in the
electrostatic loudspeaker disclosed in Patent Document 2, since there is a non-conductive elastic
member between the electrode and the vibrating body, the electrode and the vibrating body do
not need to be tensioned. Does not touch. However, when an elastic member is used, it becomes
difficult to maintain the linearity of the amount of compression of the volume of the elastic
member as the displacement of the vibrator increases. Then, it becomes difficult to maintain the
linearity of the displacement of the vibrating body, and the acoustic characteristics are degraded.
[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 that can ensure displacement of a
vibrating body while preventing contact between an electrode and the vibrating body.
[0006]
In order to solve the problems described above, according to the present invention, there is
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provided a first electrode having conductivity, a second electrode having conductivity and spaced
apart from the first electrode, the first electrode, and the first electrode. A plurality of support
members disposed between the two electrodes and spaced apart from the first electrode and the
second electrode, and conductive, supported by the support member through between the
plurality of support members To provide an electrostatic type speaker having a vibrating body.
[0007]
In the present invention, the support member may have conductivity.
In the present invention, a bias voltage may be applied to the plurality of support members and
the vibrator.
Further, in the present invention, the support member may be disposed with the end portion
inserted in the long hole. Further, in the present invention, the vibrator may be supported by the
support member in a non-tensioned state.
[0008]
According to the present invention, in the electrostatic speaker, the displacement of the vibrating
body can be secured while preventing the contact between the electrode and the vibrating body.
[0009]
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. 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 a plurality of wires 40. 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. Therefore, when there is no particular need to distinguish between the two, the
descriptions of "L" and "U" are described. Omit. Also, the dimensions of each component in the
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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 back to the front of the drawing, and those in which x is described in o
are the front of the drawing. It means the arrow from the back to the back.
[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. The wire 40 is a linear member having a circular
cross section, and its material is an insulator.
[0011]
The spacer 30 is formed of an insulator, and its shape is a square frame as shown in FIG. Further,
in the lower surface portion of the spacer 30U and the upper surface portion of the spacer 30L, a
groove 31 having a semicircular cross section and into which the wire 40 is fitted is provided. In
the present embodiment, the lengths in the X direction and the Y direction of the spacer 30 and
the lengths in the X direction and the Y direction of the electrode 20 are the same. Further, the
heights of the spacers 30U and the spacers 30L in the Z direction are the same.
[0012]
The electrode 20 is formed in a rectangular plate shape and has conductivity. Further, in the
electrode 20, in order to ensure sound transmission, a plurality of through holes 21 penetrating
from the front surface to the back surface of the electrode 20 are provided at predetermined
intervals.
[0013]
In the present embodiment, the length of the electrode 20 in the X direction is longer than the
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length of the vibrating body 10 in the X direction. Further, the length in the Y direction of the
vibrating body 10 is shorter than the distance in the Y direction of the inner space of the spacer
30.
[0014]
(Structure of Electrostatic Speaker 1) Next, the structure of the electrostatic speaker 1 will be
described. In the electrostatic loudspeaker 1, the electrode 20L is fixed to the lower side of the
spacer 30L, and the electrode 20U is fixed to the upper side of the spacer 30U. The spacer 30U
and the spacer 30L are fixed by sandwiching the vibrating body 10 and the wire 40 between the
lower surface of the spacer 30U and the upper surface of the spacer 30L. Here, the plurality of
wires 40 are fitted in the grooves 31 provided in the spacer 30, and are spanned between the
frames along the X direction of the spacer 30, and are parallel to each other at a predetermined
distance in the X direction It is in the state of being lined up. The vibrating body 10 is also
stretched between the frames along the Y direction of the spacer 30 so as to alternately pass the
upper side and the lower side of the plurality of wires 40 arranged in the X direction. It is in a
supported state (a state in which the wire 40 functions as a support member for supporting the
vibrating body 10). In the present embodiment, the vibrating body 10 is stretched between the
frames of the spacer 30 in a non-tensioned state, but since the plurality of wire members 40
support the vibrating body 10, vibration is caused. It is possible to position the body 10 at a
predetermined position in the spacer 30.
[0015]
(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 electrodes 20 are connected to one end and the other end of the output side of
the transformer 50, respectively. 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.
[0016]
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(Operation of Electrostatic Speaker 1) 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. Then, when a
potential difference is generated between the electrode 20U and the electrode 20L due to the
applied voltage, in the portion of the vibrator 10 between the electrode 20U and the electrode
20L, either of the electrode 20U and the electrode 20L is There is an electrostatic force that
attracts you.
[0017]
For example, when an acoustic signal is input to the input unit 60, a positive voltage is applied to
the electrode 20U, and a negative voltage is applied to the electrode 20L, a positive voltage is
applied to the vibrating body 10 by the bias power supply 70. Therefore, the vibrator 10 repels
with the electrode 20U to which a positive voltage is applied, and is attracted to the electrode
20L to which a negative voltage is applied, and is displaced toward the electrode 20L (opposite
to the Z direction) .
[0018]
Further, when an acoustic signal is input to the input unit 60, a negative voltage is applied to the
electrode 20U, and a positive voltage is applied to the electrode 20L, the vibrator 10 repels with
the electrode 20L to which a positive voltage is applied. While being attracted by the electrode
20U to which a negative voltage is applied, the electrode 20U is displaced toward the electrode
20U (Z direction).
[0019]
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 passes through at least one of the electrode 20U or the electrode 20L and
is emitted to the outside of the electrostatic speaker 1.
[0020]
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The vibrating body 10 is stretched between the frames along the Y direction of the spacer 30 so
that the vibrating body 10 alternately passes the upper side and the lower side of the wire 40, so
the vibrating body 10 is drawn to the electrode 20L side. When the vibrating body 10 is pulled
toward the electrode 20U, the portion passing the lower side of the wire 40 is the electrode 20U.
It does not displace to the side.
Since the vibrating body 10 is in a non-tensioned state, the displacement amount at the time of
displacement is increased according to the electrostatic force, but the displacement is limited by
the wire 40 in this manner. There is no risk of contacting the electrode 20 as compared with the
case where it is not provided.
[0021]
Further, in the present embodiment, since the vibrating body 10 is not in a tensioned state, it is
possible to maintain the linearity of the displacement amount of the vibrating body even in the
state of receiving a large electrostatic force. There is no deterioration in acoustic characteristics
as compared to the case where a large tension is applied.
[0022]
[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.
[0023]
In the embodiment described above, the vibrating body 10 is positioned between the spacer 30U
and the spacer 30L in a non-tensioned state, but the vibrating body 10 is tensioned to such an
extent that slack is eliminated, and the spacer 30U is And the spacer 30L.
[0024]
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In the embodiment described above, the positions of the plurality of wires 40 in the Z direction
are the same, but as shown in FIG. 4, the positions of the arranged wires 40 in the Z direction are
alternately shifted up and down. It is also good.
In the present invention, the material of the wire 40 may be elastic, and may be deformed by
receiving a force from the vibrating body 10 when the vibrating body 10 is displaced. Moreover,
in the present invention, as long as the vibrating body 10 can be supported, they do not have to
be parallel to each other.
[0025]
In the present invention, the electrode 20 may be formed by forming a transparent conductive
film such as indium tin oxide on the surface of a transparent resin sheet such as PET, and this
conductive film may be connected to the transformer 50. In the case of the vibrator 10, a
transparent conductive film of indium tin oxide or the like is formed on the front and back
surfaces of a transparent resin sheet such as PET, and the conductive film is connected to the
bias power supply 70. Good. The wire 40 and the spacer 30 may also be formed of a synthetic
resin having transparency.
[0026]
In the embodiment described above, the cross-sectional shape of the wire 40 is circular, but the
cross-sectional shape of the wire 40 may be polygonal, elliptical, semicircular, convex, or the like.
Further, the shape is not limited to a linear or rod shape as long as the vibrating body 10 can be
supported, and the vibrating body 10 may be supported by a thin plate-like member having a
narrow width such as a ribbon. Good.
[0027]
In the above-described embodiment, a space formed by bringing the groove 31 of the spacer 30U
and the groove 31 of the spacer 30L into contact is circular in cross section, and the wire 40 is
closely fitted in this space. As shown in 5, while making this space into a long hole, the diameter
of the wire 40 may be smaller than the width of the groove 31 so that the wire 40 can be
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displaced in the Z direction. In addition, in one of the two frames along the X direction, the wire
40 adheres to the groove 31 while in the other frame, the space formed by abutting the groove
31 of the spacer 30U and the groove 31 of the spacer 30L. May be long holes, and the wire 40
may be supported by one frame.
[0028]
In the embodiment described above, the wire 40 is an insulator, but the wire 40 may be
conductive. When the wire 40 has conductivity, the wire 40 may be connected to the bias power
supply 70 in the same manner as the vibrating body 10. According to this configuration, the wire
40 is also displaced by electrostatic force and vibrates according to the acoustic signal. Then, it is
possible to lower the lowest resonance frequency, and since the displacement of the vibrating
body 10 is large as compared with the case where the wire 40 is formed of an insulator, the
reproduction of the low band is improved.
[0029]
The number of wires 40 and the distance between the wires 40 may be appropriately changed
according to the size of the electrostatic speaker 1. Further, in the above-described embodiment,
the vibrator 10 alternately passes up and down between the wires 40, but when the number of
the wires 40 is large, for example, after passing over two wires. After passing under two wires or
passing above three wires, it may pass under two wires.
[0030]
FIG. 1 is an external view of an electrostatic speaker 1 according to an embodiment of the
present invention. FIG. 2 is a cross-sectional view of the electrostatic speaker 1; FIG. 2 is an
exploded perspective view of the electrostatic speaker 1; 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.
Explanation of sign
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[0031]
DESCRIPTION OF SYMBOLS 1 ... Electrostatic type speaker, 10 ... Vibrator, 20, 20 U, 20 L ...
Electrode, 30, 30 U, 30 L ... Spacer, 31 ... Groove, 40 ... Wire material
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