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JP2017050709

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DESCRIPTION JP2017050709
Abstract: In an electrostatic speaker including an electrode provided with a hole, a discharge is
less likely to occur, and a large sound pressure can be obtained. In the electrostatic speaker 1,
the edge of the vibrating body 10 is located outside the space between the conductive layer 22U
of the facing electrode 20U and the conductive layer 22L of the electrode 20L, and the edge of
the vibrating body 10 is The gap length from the electrode to the conductive layer can be
increased, and the limit voltage between the edge portion of the vibrator 10 and the conductive
layer is equal to the limit voltage between the flat portion of the vibrator 10 and the flat portion
of the conductive layer. It is possible to suppress the occurrence of discharge between the edge
portion of the vibrating body 10 and the conductive layer. In addition, since the vibrator 10 has a
structure in which the insulating layers 12 are provided on both sides of the conductive layer 11,
the occurrence of discharge between the conductive layer of the vibrator and the conductive
layer of the electrode is suppressed. [Selected figure] Figure 3
Electrostatic speaker
[0001]
The present invention relates to an electrostatic speaker.
[0002]
The electrostatic speaker includes two electrodes spaced apart and facing each other, and a
conductive vibrator inserted between the two electrodes.
04-05-2019
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When the voltage applied to the electrodes is changed in a state where a predetermined bias
voltage is applied to the vibrator, the electrostatic force acting on the vibrator is changed, and
thereby the vibrator is displaced. When the applied voltage is changed according to the acoustic
signal, the vibrator repeats displacement (i.e., vibrates), and an acoustic wave corresponding to
the acoustic signal is generated from the vibrator. The generated acoustic wave is radiated to the
outside through the hole formed in the electrode.
[0003]
The vibrating body of the electrostatic speaker has a very small thickness of several μm to
several tens of μm, and since the thin film layer of conductive metal is formed on the entire
surface, the edge portion is sharpened. It is similar to the needle electrode. When such a
vibrating body is disposed between two electrodes, a strong electric field is generated at the edge
portion, and discharge is more likely to occur compared to a portion where the electrode faces
are opposed to each other. In the electrostatic speaker, it is necessary to apply a high voltage to
the electrode in order to vibrate the vibrator, but it is difficult to apply the high voltage to the
electrode in such a state where discharge easily occurs. Then, if a high voltage is not applied to
the electrodes, the electrostatic force acting on the vibrator becomes weak, so the displacement
amount of the vibrator also becomes small, and a large sound pressure can not be obtained.
[0004]
Then, the mechanism for making an electrode smaller than a vibrating body and solving the
above problems of discharge is disclosed by patent document 1. FIG.
[0005]
JP, 2010-16603, A
[0006]
By the way, as described above, since the hole is opened in the electrode, there is a possibility
that the discharge phenomenon may occur through the hole between the edge portion of the
vibrator or the conductive layer of the vibrator and the electrode.
[0007]
The present invention has been made under the above-described background, and it is an object
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of the present invention to provide an electrostatic speaker including an electrode provided with
a hole, in which discharge is unlikely to occur and a large sound pressure can be obtained.
[0008]
In order to solve the problems described above, the present invention provides an insulating base
layer, a first conductive layer provided on one surface of the base layer, the base layer, and the
first conductive layer. A first electrode having a hole, an insulating base layer, a second
conductive layer provided on one surface of the base layer, a hole passing through the base layer
and the second conductive layer Between the first electrode and the second electrode between
the first electrode and the second electrode, and a second electrode arranged to face the first
electrode and separated from the first electrode. A vibrating body having a conductive layer and
insulating layers provided on both sides of the conductive layer, wherein an edge of the vibrating
body is a first conductive layer of the opposing first electrode The electrostatic speaker may be
located outside the space between the second conductive layers of the second electrode.
[0009]
In the vibrating body, in the region located outside the space between the opposing conductive
layer of the first electrode and the conductive layer of the second electrode, a portion where the
insulating layer and the conductive layer are not adhered is included. It may be done.
[0010]
The first conductive layer of the first electrode is provided closer to the vibrator than the base
layer of the first electrode, and the second conductive layer of the second electrode is the second
electrode of the second electrode. It may be provided closer to the vibrator than the base
material layer.
[0011]
The first conductive layer of the first electrode is provided on the side farther from the vibrator
than the base layer of the first electrode, and the second conductive layer of the second electrode
is the second electrode of the second electrode. It may be provided on the side farther from the
vibrator than the base material layer.
[0012]
The first conductive layer or the second conductive layer which one electrode of the first
electrode or the second electrode has is provided closer to the vibrator than the base material
layer which the one electrode has. Side of the first conductive layer or the second conductive
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layer included in the other electrode of the first electrode or the second electrode is farther from
the vibrator than the base material layer included in the other electrode May be provided.
[0013]
According to the present invention, in an electrostatic speaker provided with an electrode
provided with a hole, discharge is less likely to occur, and a large sound pressure can be
obtained.
[0014]
FIG. 1 is an external view of an electrostatic speaker according to an embodiment of the present
invention.
It is an exploded perspective view of an electrostatic type speaker concerning an embodiment.
It is a schematic diagram of the cross section and electrical configuration of the electrostatic
speaker which concern on embodiment.
It is a top view of an electrostatic type speaker concerning an embodiment.
It is sectional drawing of the electrostatic speaker as a comparative example.
It is sectional drawing of the electrostatic speaker which concerns on embodiment and a
modification.
[0015]
1 schematically shows the appearance of an electrostatic speaker 1 according to an embodiment
of the present invention, FIG. 2 is an exploded perspective view of the electrostatic speaker 1,
and FIG. 3 is a plan view of the electrostatic speaker 1 FIG. 4 is a view schematically showing the
cross section and the electrical configuration of the electrostatic speaker 1.
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As shown in FIGS. 1 and 2, the electrostatic speaker 1 has a vibrating body 10, electrodes 20U
and 20L, and elastic members 30U and 30L, which are stacked in the Z-axis direction. .
In this embodiment, the configurations of the electrodes 20U and 20L are the same, and the
configurations of the elastic members 30U and 30L are the same. Therefore, when there is no
particular need to distinguish between the respective members, “U” and “L The description of
"is omitted.
Further, the reference numerals of the constituent elements of the electrode 20U are attached
with "U", and the reference numerals of the constituent elements of the electrode 20L are
attached with "L".
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 back to the front of the drawing.
[0016]
First, the components of the electrostatic speaker 1 will be described. As shown in FIG. 3, the
vibrating body 10 is a planar member provided with the insulating layers 12 on both sides of the
conductive layer 11 and has a rectangular shape when viewed in a direction parallel to the Z axis.
. The conductive layer 11 is a layer including a conductive material such as a metal, for example.
The insulating layer 12 is a layer containing a substance having an insulating property, and is a
film of a synthetic resin such as PET (polyethylene terephthalate, polyethylene terephthalate) or
PP (polypropylene, polypropylene).
[0017]
The elastic member 30 is, for example, a non-woven fabric and is a flat member which can pass
04-05-2019
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air and sound without passing electricity, and has a rectangular shape when viewed in a direction
parallel to the Z-axis. The elastic member 30 further has elasticity, and deforms when an external
force is applied, and returns to its original shape when an external force is removed. That is, the
elastic member 30 may be a member which has insulation, transmits sound, and is elastic, for
example, a material obtained by applying heat to the batt and compressing it, a woven cloth, and
a synthetic resin having insulation. It may be in the form of a letter.
[0018]
The electrode 20 is, for example, a substrate layer 21 obtained by processing a material
including an insulating material such as PET or PP into a rectangular plate, and one surface of
the substrate layer 21 made of a conductive material such as metal. It is comprised with the
rectangular-shaped conductive layer 22 formed. As shown in FIG. 3, the conductive layer 22U of
the electrode 20U is on the opposite side of the elastic member 30 as viewed from the base layer
21U, and the conductive layer 22L of the electrode 20L is on the opposite side of the elastic
member 30 as viewed from the base layer 21L. It is in. In the electrode 20, a plurality of through
holes 23 penetrating the base layer 21 and the conductive layer 22 are provided in a matrix at
predetermined intervals from the front surface to the back surface of the electrode 20 in order to
ensure sound transmission. The illustration of the through hole 23 is omitted in FIGS. The base
material layer 21 may have an insulating property, and may be, for example, one in which paper
is impregnated with an epoxy resin, or one in which glass fibers are stacked and impregnated
with an epoxy resin.
[0019]
As shown in FIGS. 1 to 4, the length in the X-axis direction of the elastic member 30 is
substantially the same as the length in the X-axis direction of the electrodes 20 U and 20 L, but
smaller than the length in the X-axis direction of the vibrating body 10 . The length of elastic
member 30 in the Y-axis direction is substantially the same as the length of electrodes 20U and
20L in the Y-axis direction, but is smaller than the length of vibrator 10 in the Y-axis direction.
That is, also between the electrode 20U and the vibrating body 10, the area (area of a region
parallel to the XY plane) of the conductive layer 22U of the electrode 20U is narrower than the
area of the vibrating body 10 (area of a region parallel to the XY plane) When viewed in a
direction parallel to the Z axis, the entire surface of the conductive layer 22U of the electrode
20U is inside the edge of the vibrating body 10. Similarly, between the electrode 20L and the
vibrator 10, the area of the conductive layer 22L of the electrode 20L (area of a region parallel to
the XY plane) is larger than the area of the vibrator 10 (area of a region parallel to the XY plane)
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When viewed in a direction parallel to the Z axis, the entire surface of the conductive layer 22L is
inside the edge of the vibrator 10 when viewed narrow.
[0020]
(Electrical Configuration of Electrostatic Speaker 1) Next, the electrical configuration of the
electrostatic speaker 1 will be described. As shown in FIG. 3, the electrostatic speaker 1 is a push
having 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. It is a pull-type
electrostatic speaker. The bias power supply 70 is connected to the vibrating body 10 and the
middle point on the output side of the transformer 50. The electrode 20U is connected to one
end of the output side of the transformer 50, and the electrode 20L is connected to the other end
of the output side of the transformer 50. The input side of the transformer 50 is connected to the
input unit 60. 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.
[0021]
(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 conductive layer 22U of the
electrode 20U and the conductive layer 22L of the electrode 20L. When a potential difference
occurs between conductive layer 22U of electrode 20U and conductive layer 22L of electrode
20L, vibration body 10 between electrode 20U and electrode 20L moves to either side of
electrode 20U or electrode 20L. There is an electrostatic force that attracts you.
[0022]
For example, an acoustic signal is input to the input unit 60 and this acoustic signal is supplied to
the transformer 50, a positive voltage is applied to the conductive layer 22U of the electrode
20U, and a negative voltage is applied to the conductive layer 22L of the electrode 20L. In this
case, since a positive voltage is applied to the vibrating body 10 by the bias power supply 70, the
vibrating body 10 repels the conductive layer 22U of the electrode 20U to which the positive
voltage is applied, while the negative voltage It is drawn to the conductive layer 22L of the
electrode 20L being applied, and is displaced toward the electrode 20L (in the negative Z-axis
direction).
04-05-2019
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[0023]
Also, an acoustic signal is input to the input unit 60 and this acoustic signal is supplied to the
transformer 50, a negative voltage is applied to the conductive layer 22U of the electrode 20U,
and a positive voltage is applied to the conductive layer 22L of the electrode 20L. In such a case,
the vibrator 10 repels the conductive layer 22L of the electrode 20L to which a positive voltage
is applied, while being attracted to the conductive layer 22U of the electrode 20U to which a
negative voltage is applied. Displacement in the positive direction).
[0024]
As described above, the vibrating body 10 is displaced in the positive or negative direction of the
Z axis (deflection) 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
corresponding sound is generated from the vibrator 10.
The generated sound passes through the through hole 23U of the electrode 20U and is radiated
to the outside of the electrostatic speaker 1, and passes through the through hole 23L of the
electrode 20L and is radiated to the outside of the electrostatic speaker 1.
[0025]
(Method of Manufacturing Electrostatic Speaker 1) When manufacturing the vibrator 10, first, a
film (insulating layer 12) of synthetic resin such as PET or PP having insulation and flexibility is
used as a base material A conductive metal is vapor deposited or a conductive paint is applied to
one surface of the conductive layer 11 to form the conductive layer 11.
Then, a film of synthetic resin such as PET or PP having insulating properties and flexibility is
adhered to the other surface of the film with an adhesive, and this is used as the insulating layer
12. Further, for example, a film (insulating layer 12) of a synthetic resin having insulating
properties and flexibility is used as a base material, and a conductive metal is vapor-deposited or
coated with a conductive paint on one surface of the film to form the conductive layer 11. In the
above-described sheet, an adhesive is applied to the conductive layer 11, and the conductive
layer 11 is folded in half so that the conductive layer 11 is inside, and the opposing conductive
layers 11 are adhered to each other. Also by this, the vibrator 10 in which the insulating layer 12
04-05-2019
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is provided on both sides of the conductive layer 11 can be manufactured.
[0026]
However, in the region located in the space between the conductive layer 22U of the opposing
electrode 20U and the conductive layer 22L of the electrode 20L in the vibrator 10, at least one
of the conductive layer 11 and the two insulating layers 12 is insulated. It includes a portion
where the layer 12 is not adhered. For example, in FIG. 4, a portion A1 of a region of the
vibrating body 10 (outward of a hatched portion in the figure, that is, a direction parallel to the Z
axis) located outside the space between the conductive layer 22U of the electrode 20U and the
conductive layer 22L of the electrode 20L. No adhesive is applied on the part of the region where
the vibrator 10 does not overlap with the conductive layer 22U of the electrode 20U and the
conductive layer 22L of the electrode 20L when viewed from the point of view, the conductive
layer 11 and at least one of the insulation The layer 12 is not adhered. This portion A1 is in a
non-adhesive state in order to facilitate connection of the conducting wire to the vibrating body
10 as described later. In the vibrating body 10, it is optional which part of the region located
outside the space between the conductive layer 22U of the electrode 20U and the conductive
layer 22L of the electrode 20L is non-adhesive. For example, in FIG. 4, a portion corresponding to
one side of the rectangular vibrating body 10 is a non-adhesion portion, but a portion
corresponding to two or more sides may be a non-adherence portion, and of the portions
corresponding to one side, Only a portion thereof may be a non-adhesive portion.
[0027]
When manufacturing the electrode 20, metal is formed on one surface of the base layer 21 by a
method such as etching with respect to the base layer 21 obtained by processing an insulating
material such as PET or PP into a rectangular plate shape. The conductive layer 22 is formed of a
conductive material such as, for example. And the hole 23 which penetrates these base material
layers 21 and the conductive layer 22 is provided. Then, the elastic member 30L is adhered to
the conductive layer 22L of the electrode 20L by an adhesion means such as a double-sided tape.
Similarly, the elastic member 30U is adhered to the conductive layer 22U of the electrode 20U by
an adhesion means such as double-sided tape. At this time, it is desirable that the elastic
members 30L and 30U be adhered to the entire surfaces of the conductive layer 22L of the
electrode 20L and the conductive layer 22U of the electrode 20U. As described above, by making
the bonding surfaces of the electrode 20 and the elastic member 30 as wide as possible, and
increasing the rigidity when both are integrated, the vibrating body 10 is more easily vibrated.
04-05-2019
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[0028]
Then, the elastic member 30U and the vibrator 10 are disposed so as to have a positional
relationship as shown in FIG. 4 when viewed in a direction parallel to the Z axis. In each
insulating layer 12 of the vibrating body 10, an adhesive is applied to a region of several
millimeters wide at a predetermined distance away from each edge in the positive and negative
directions of the X axis and each edge in the positive and negative directions of the Y axis. It is
adhered to the member 30U and the elastic member 30L. In each insulating layer 12 of the
vibrating body 10, the elastic member 30U and the elastic member 30L are not fixed to the inner
side from the portion to which the adhesive is applied.
[0029]
Thereby, as shown in FIGS. 1 to 3, the members of the electrostatic speaker 1 are stacked, the
elastic member 30U contacts the vibrating body 10 and the electrode 20U, and the elastic
member 30L is vibrating the vibrating body 10 and the electrode It will be in the state which
contacted with 20L, respectively. Since the elastic member 30U and the elastic member 30L
sandwich and support the vibrating body 10, the vibrating body 10 is disposed at an
intermediate position between the electrode 20U and the electrode 20L when the vibrating body
10 is not driven. Ru.
[0030]
Next, wiring is performed. A conductive wire is electrically connected to a portion of the
conductive layer 11 of the vibrator 10 which is not bonded to the insulating layer 12 as
described above. At this time, assuming that the entire surface of the conductive layer 11 and the
entire surface of the insulating layer 12 are bonded, it is necessary to partially release the
bonded state, which takes time and effort. In addition, in the case where the non-adhered portion
between conductive layer 11 and insulating layer 12 is included in a region located in the space
between conductive layer 22U of electrode 20U and conductive layer 22L of electrode 20L in
vibrating body 10, constant It is necessary to work to expose the conductive layer 11 by bending
the electrode 20U and the electrode 20L each having a hardness of 1 mm apart from each other,
which also takes time and effort. On the other hand, in the present embodiment, outside the
space between the conductive layer 22U of the electrode 20U and the conductive layer 22L of
the electrode 20L, the conductive layer 11 is exposed only by turning over the insulating layer
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12 in the non-adhesive portion. Connection is easy.
[0031]
Furthermore, conductive wires are electrically connected to the conductive layer 22U of the
electrode 20U and the conductive layer 22L of the electrode 20L, respectively. Then, the lead
connected to the conductive layer 11 of the vibrator 10 is connected to the bias output terminal
of the bias power source 70 connected to the middle point of the transformer 50, and the lead
connected to the conductive layer 22U of the electrode 20U is transformed It connects to one
terminal of the output side of the unit 50, and further connects the lead connected to the
conductive layer 22L of the electrode 20L to the other terminal of the output side of the
transformer 50. Thereby, the vibration body 10 can be vibrated by applying a signal
corresponding to the acoustic signal to the conductive layer 22U of the electrode 20U and the
conductive layer 22L of the electrode 20L.
[0032]
(Effect of Electrostatic Speaker 1) The effect of the electrostatic speaker 1 according to the
present embodiment will be described using a comparative example. In the electrostatic
loudspeaker as the comparative example shown in FIG. 5A, the insulating layer 120 is provided
only on one surface of the conductive layer 110 of the vibrator 100. Further, the lengths in the
X-axis direction of vibrator 100 and the lengths in the X-axis direction of electrodes 200U and
200L are substantially the same, and the lengths in the Y-axis direction of vibrator 100 and Yaxis directions of electrode 200U and electrode 200L The length is almost the same. The edge
portion of the vibrator 100 is similar to the needle electrode, and the relationship between the
edge portion and the conductive layer 202 of the electrode 200 is a needle electrode-flat plate
relationship. When the gap length (arrows in the figure) of the electrode is short, the voltage at
which discharge occurs between the edge portion and the conductive layer 202 when a voltage is
applied (hereinafter referred to as limit voltage) It may become lower than the limit voltage when
discharge occurs between the flat portion and the flat portion of the conductive layer 202 (flat
plate-flat relationship). Further, in addition to the insulating layer 120 being provided only on
one surface of the conductive layer 110 of the vibrator 100 as described above, the electrodes
200U and 200L are provided with a plurality of through holes. Therefore, when the gap length
(arrow in the figure) between the conductive layer 110 of the vibrator 100 and the conductive
layer 202L of the electrode 200L is short, the conductive layer 110 of the vibrator 100 and the
conductive layer 110 are applied when a voltage is applied. The limit voltage when discharge
occurs between the closer electrode 200L and the conductive layer 202L is discharge between
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the flat portion of the vibrator 100 and the flat portion of the conductive layer 202 (plate-plate
relationship). May be lower than the limit voltage when Thus, in this structure, there is the
possibility of an unexpected discharge.
[0033]
To solve this problem, as shown in FIGS. 5B and 5C, the length of the vibrating body 100 in the
X-axis direction and the lengths of the electrodes 200U and 200L in the X-axis direction are
made different, and A measure may be taken to make the length in the Y-axis direction 100
different from the length in the Y-axis direction of the electrodes 200U and 200L. In the case of
FIG. 5B, the length of the vibrating body 100 in the X-axis direction is shorter than the lengths of
the electrodes 200U and 200L in the X-axis direction, and the length of the vibrating body 100
in the Y-axis direction is the electrodes 200U and 200L. Shorter than the length in the Y-axis
direction of However, even with such a structure, when the gap length between the edge portion
and the conductive layer 202 is short, discharge occurs between the edge portion of the vibrator
100 and the conductive layer 202 when a voltage is applied. The limit voltage when firing may
be lower than the limit voltage when discharge occurs between the flat portion of the vibrator
100 and the flat portions of the conductive layers 202U and 202L (plate-plate relationship).
Further, as described above, in addition to the insulating layer 120 being provided only on one
surface of the conductive layer 110 in the vibrator 100, since the electrodes 200U and 200L are
provided with a plurality of through holes, the vibrator When the gap length (the arrow in the
figure) between the conductive layer 110 of 100 and the conductive layer 202L of the electrode
200L is short, the electrode closer to the conductive layer 110 and the conductive layer 110 of
the vibrator 100 when a voltage is applied. The limit voltage when discharge occurs between
200 L of conductive layer 202L is the limit when discharge occurs between the flat portion of
vibrator 100 and the flat portion of conductive layer 202 (plate-plate relationship) It may be
lower than the voltage. Therefore, even with this structure, there is a possibility of unexpected
discharge.
[0034]
Further, in the case of FIG. 5C, the length in the X axis direction of the vibrating body 100 is
longer than the length in the X axis direction of the electrodes 200U and 200L, and the length in
the Y axis direction of the vibrating body 100 is the electrode 200U and It is longer than the
length in the Y-axis direction of the electrode 200L. However, even with such a structure, in
addition to the fact that insulating layer 120 is provided only on one side of conductive layer 110
of vibrator 100 as described above, a plurality of through holes are formed in electrodes 200U
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and 200L. When the gap length between the conductive layer 110 of the vibrator 100 and the
conductive layer 202L of the electrode 200L (arrows in the figure) is short, the conductive layer
110 of the vibrator 100 and the conductive layer 110 of the vibrator 100 are provided. The limit
voltage when discharge occurs between the conductive layer 202L of the electrode 200L closer
to the conductive layer 110 is between the flat portion of the vibrator 100 and the flat portion of
the conductive layer 202 (plate-plate relationship) May be lower than the limit voltage when
discharge occurs. Therefore, there is a possibility of unexpected discharge.
[0035]
Further, as another method for solving the problem of FIG. 5A, as shown in FIG. 5D, the vibrating
body 100 has a structure in which insulating layers 120 are provided on both sides of the
conductive layer 110. It is conceivable. However, even in this structure, as described above, when
the gap length between the edge portion and the conductive layer 202 is short, when a voltage is
applied, it is between the edge portion of the vibrator 100 and the conductive layer 202. The
limit voltage when the discharge occurs may be lower than the limit voltage when the discharge
occurs between the flat portion of the vibrator 100 and the flat portions of the conductive layers
202U and 202L (plate-plate relationship). . Therefore, even with this structure, there is a
possibility of unexpected discharge.
[0036]
On the other hand, in the electrostatic loudspeaker 1 according to this embodiment, the edge of
the vibrating body 10 is located outside the space between the conductive layer 22 of the facing
electrode 20U and the conductive layer 22 of the electrode 20L, The gap length from the edge of
the vibrating body 10 to the conductive layer 22 can be made longer as compared with FIGS. 5
(a) and 5 (d). Therefore, it is possible to make the limit voltage between the edge portion of the
vibrator 10 and the conductive layer 22 equal to the limit voltage between the flat portion of the
vibrator 10 and the flat portion of the conductive layer 22. Thus, the occurrence of discharge
between the edge portion of the vibrator 10 and the conductive layer 22 can be suppressed. In
addition, in the electrostatic loudspeaker 1 according to the present embodiment, since the
vibrating body 10 has a structure in which the insulating layers 12 are provided on both sides of
the conductive layer 11, FIGS. 5 (a) and 5 (b) It is possible to suppress the occurrence of
discharge between the conductive layer of the vibrator and the conductive layer of the electrode
as described in (c) and (c). As a result, a high voltage is applied to the conductive layer 22 to
increase the electrostatic force acting on the vibrator 10, and the displacement amount of the
vibrator 10 can be increased to obtain a larger sound pressure.
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[0037]
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.
[0038]
(Modification 1) In the above-described embodiment, the electrode 20U and the electrode 20L
have a structure in which the insulating base layer 21 is disposed closer to the vibrator 10 than
the conductive layer 22, but the electrode 20U The conductive layer 22 may be disposed closer
to the vibrator 10 than the base layer 21 for at least one of the electrodes 20L. Thereby, as
described below, sound adjustment such as expansion of the low band and increase of sound
pressure becomes possible.
[0039]
First, FIG. 6 (a) shows the same configuration as FIG. In the figure, the distance between the
surface on the elastic member 30U side of the insulating layer 12 and the surface on the elastic
member 30U side of the base material layer 21U of the electrode 20U is GAP (SWING). GAP
(SWING) is a value that defines the physical limit of the amplitude of the vibrating body 10.
Further, the distance between the surface on the elastic member 30U side of the conductive layer
11 and the surface on the elastic member 30U side of the conductive layer 22U of the electrode
20U is GAP (E). GAP (E) means an electrical gap between the conductive layer 11 and the
conductive layer 22U.
[0040]
Here, as shown in FIG. 6B, with the GAP (E) being the same as FIG. 6A, the conductive layer 22 of
each electrode 20 is closer to the vibrating body 10 than the base layer 21. Deploy. Thereby, GAP
(SWING) _WIDE becomes larger than GAP (SWING) by a value which defines the physical limit of
04-05-2019
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the amplitude of the vibrating body 10. In this case, since the GAP (E) does not change, the
amplitude of the vibrating body 10 can be increased without changing the driving strength for
vibrating the vibrating body 10 in FIG. The lower range below the threshold is expanded.
[0041]
Further, as shown in FIG. 6C, the conductive layer 22 in each electrode 20 is disposed closer to
the vibrator 10 than the base layer 21 while keeping the GAP (SWING) the same as in FIG. Do. In
this case, since GAP (E) _NARROW is smaller than GAP (E), the capacitance between the
conductive layer 11 and the conductive layer 22U is increased. Thereby, the sound emission
sound pressure by the vibrating body 10 increases.
[0042]
In addition, it does not restrict to the illustration of FIG.6 (b), (c), and the 1st conductive layer or
2nd conductive layer which one electrode has among the 1st electrode or the 2nd electrode is a
base material which the said one electrode has. The first conductive layer or the second
conductive layer provided on the side closer to the vibrator than the layer and included in the
other electrode of the first electrode or the second electrode is closer to the base layer included
in the other electrode Also, it may be provided on the side far from the vibrator.
[0043]
(Modification 2) The length of the elastic member 30 in the X-axis direction may be different
from the length of the electrode 20 in the X-axis direction, and the length of the elastic member
30 in the Y-axis direction is the length of the electrode 20 in the Y-axis direction. It may be
different from the length.
For example, the length of the elastic member 30 in the X-axis direction may be the same as the
length of the vibrating body 10 in the X-axis direction, or the length of the elastic member 30 in
the Y-axis direction is the length of the vibrating body 10 in the Y-axis direction May be the
same. The shapes of the vibrating body 10, the electrode 20, and the elastic member 3 are not
limited to rectangular, and may be other shapes such as, for example, polygonal, circular, or
elliptical. In the electrostatic loudspeaker 1, the bonding means is not limited to the adhesive and
the double-sided tape. Moreover, in the electrostatic speaker 1, the structure which does not
adhere | attach adjacent members in laminated structure may be sufficient.
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[0044]
DESCRIPTION OF SYMBOLS 1 ... Electrostatic type speaker 1 ... Vibrator, 20 U, 20 L ... Electrode,
21 ... Base material layer, 22 ... Conductive layer, 23 ... Through-hole, 30 U, 30 L .. -Elastic
member, 50: Transformer, 60: Input part, 70: Bias power supply.
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