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JP2009272853

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2009272853
To provide an electrostatic speaker capable of increasing sound pressure, or an electrostatic
speaker capable of increasing sound pressure without causing attenuation of a high region due to
thickness even in a laminated structure. The purpose is A vibrating membrane (110) having a
conductive layer, and a fixed electrode (120) formed of a metal wire contacting with the vibrating
membrane at a plurality of points or a plurality of lines, the surface of the vibrating membrane
and the fixed electrode At least one contact position of the surface of the is insulated, and a bias
voltage and an alternating current signal are applied between the conductive layer of the
vibrating membrane and the fixed electrode. [Selected figure] Figure 1
Electrostatic speaker
[0001]
The present invention relates to an electrostatic speaker.
[0002]
In a conventional general electrostatic speaker, as shown in FIG. 7, a porous metal plate having
conductivity such as punching metal is used as the fixed electrodes 120A and 120B, and a film
having conductivity is used as the vibrating film 110. A stretched one is used, and a gap for
vibration is provided between the two by the spacer 105 or the like.
[0003]
In this state, a DC bias voltage is applied between the diaphragm 110 and the fixed electrodes
120A and 120B by the bias power supply 130, and an AC signal such as an audio signal is
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applied between the diaphragm 110 and the fixed electrodes 120A and 120B. It is made to
operate.
[0004]
Here, when the distance between the fixed electrodes 120A and 120B and the vibrating film 110
is generally d, the force acting on the vibrating film 110 of the electrostatic speaker is inversely
proportional to the square of d.
That is, in order to increase the sound pressure, it is required to reduce d.
[0005]
In addition, as such an electrostatic type speaker, the thing described in the following patent
documents 1, 2, and 3 exists, for example.
JP 2005-354582 A JP JP 2007-43523 A JP B 40-26002 A
[0006]
The electrostatic loudspeakers described in Patent Documents 1 and 2 described above are
difficult to realize because a precise and fine configuration is required to reduce d described
above.
Further, as in Patent Document 3, it is possible to stack a combination of a vibrating membrane
and a fixed electrode in order to increase the sound pressure. However, in Reference 3, since a
rigid plate with holes in the fixed electrode is used, a certain thickness is required. As a result, the
overall thickness of the lamination increases in proportion to the layer.
[0007]
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Here, when the diaphragms are separated and the distance between the diaphragms is λ / 2
(here, λ is the wavelength of sound), the phases are different by 180 degrees, so that the sounds
cancel each other. Therefore, the sound pressure is extremely reduced at the frequency at which
the thickness by lamination reaches λ / 2. For this reason, depending on the laminated
structure, there is a problem that it is difficult to reproduce the high region having a short
wavelength.
[0008]
Therefore, even when used for general audio, it is difficult to reproduce the high frequency band,
and there is also a problem that the output of the ultrasonic wave area is difficult even as an
ultrasonic transducer. The present invention has been made to solve the problems as described
above, and it is an object of the present invention to provide an electrostatic speaker capable of
increasing the sound pressure.
[0009]
Another object of the present invention is to provide an electrostatic speaker capable of
increasing the sound pressure without causing attenuation of a high region due to thickness even
in the case of a laminated structure.
[0010]
The present invention for solving the above problems is as described below.
(1) The invention according to claim 1 comprises: a vibrating membrane having a conductive
layer; and a fixed electrode formed of a conductive wire contacting the vibrating membrane at a
plurality of points or a plurality of lines, A contact point of at least one of the surface and the
surface of the fixed electrode is insulated, and a bias voltage and an AC signal are applied
between the conductive layer of the vibrating film and the fixed electrode. It is an electrostatic
speaker.
[0011]
(2) The invention according to claim 2 is characterized in that the fixed electrode is a mesh in
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which conductive wires configured to have a repeating shape of unevenness or waveform are
knitted in a lattice shape. It is an electrostatic type speaker of 1.
[0012]
(3) The invention according to claim 3 is characterized in that the fixed electrode is a net formed
by combining substantially straight conductive wires or conductive bars substantially orthogonal
to each other. It is an electronic speaker.
[0013]
(4) The invention according to claim 4 is the electrostatic according to claim 1, characterized in
that the fixed electrode is a continuum in which a plurality of substantially straight conductive
wires or conductive rods are arranged in one direction. Type speaker.
[0014]
(5) The invention according to claim 5 is characterized in that the fixed electrode is a continuum
in which a plurality of conductive lines configured to have a repeating shape of unevenness or
waveform are arranged in one direction. It is an electrostatic speaker according to claim 1.
[0015]
(6) The invention according to claim 6 includes a plurality of stacked layers formed by combining
the fixed electrode and the vibrating film, and the bias voltage and the alternating current signal
are reversely applied to each layer. It is an electrostatic type speaker as described in any one of
the Claims 1 thru ¦ or 5 characterized by the above.
[0016]
According to the present invention, the following effects can be obtained.
(1) In the invention of the electrostatic loudspeaker according to claim 1, the vibrating
membrane and the fixed electrode are in contact with each other at a plurality of points or lines
in a state where the surfaces are insulated, so the distance d is mutually The force acting on the
vibrating membrane is increased as compared with the conventional electrostatic speaker in
which a gap is provided between the vibrating membrane and the fixed electrode.
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[0017]
(2) In the invention of the electrostatic type speaker according to the second aspect, a net in
which conductive wires configured to have a repeating shape of unevenness or waveform is used
as a fixed electrode is used as a fixed electrode, and a diaphragm And the fixed electrode (net) are
in contact with each other at a plurality of points or lines in a state where the surfaces are
insulated, so that the distance d between them becomes the shortest and a gap is provided
between the diaphragm and the fixed electrode. The force acting on the vibrating membrane is
greater than that of the electrostatic loudspeaker of
[0018]
(3) In the invention of the electrostatic speaker according to claim 3, a net formed of orthogonal
conductive wires or bars is used as a fixed electrode, and the vibrating membrane and the fixed
electrode (network) have surfaces that are the same. In the insulated state, since the wires are in
contact with each other, the distance d is shortest, and compared with the conventional
electrostatic speaker in which a gap is provided between the vibrating membrane and the fixed
electrode, The acting force is increased.
[0019]
(4) In the invention of the electrostatic speaker according to the fourth aspect, a stator having a
plurality of substantially straight conductive wires or bars arranged in one direction is used as a
fixed electrode, and the diaphragm and the fixed electrode ( In the case of a conventional
electrostatic speaker in which a gap is provided between a diaphragm and a fixed electrode
because the distance d between each other is shortest because a plurality of wires are in contact
with each other in the state where the surface is insulated. In comparison, the force acting on the
vibrating membrane is increased.
[0020]
(5) In the invention of the electrostatic type speaker according to the fifth aspect, a stator in
which a plurality of conductive lines configured to have a repeating shape of unevenness or
waveform are arranged in one direction is used as a fixed electrode. Since the diaphragm and the
fixed electrode (mesh) are in contact with each other by a plurality of wires in a state where the
surfaces are insulated, the distance d between them is shortest and a gap is provided between the
diaphragm and the fixed electrode. The force acting on the vibrating membrane is greater than
that of the conventional electrostatic speaker.
[0021]
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(6) In the invention of the electrostatic loudspeaker according to the sixth aspect, the vibrating
membrane and the fixed electrode are in contact with each other at a plurality of points or lines
in a state where the surfaces are insulated, and the distance d is shortest. Since a plurality of
thinner layers are stacked, it is possible to increase the sound pressure to a high frequency and
output it with a smaller thickness than in the prior art.
[0022]
Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an
embodiment) will be described in detail with reference to the drawings.
First Embodiment FIG. 1 is an explanatory view schematically showing a configuration of an
electrostatic loudspeaker 100 according to a first embodiment of the present invention.
FIG. 2 is a perspective view schematically showing the fixed electrode and the vibrating film used
in the electrostatic speaker 100 (see FIG. 1) according to the first embodiment of the present
invention.
[0023]
In this first embodiment, the fixed electrodes 120a and 120b are replaced by a metal perforated
plate such as a conventional punching metal or the like, and fixed electrodes formed of metal
wires contacting the vibrating membrane 110 with a plurality of points or a plurality of lines are
used. It is characterized by using.
[0024]
In addition, the conductive wire in a claim is a wire which has electroconductivity, and is a wire
comprised with the material which has various electroconductivity, such as a metal, an
electroconductive fiber, carbon.
Hereinafter, in this embodiment, a metal wire will be described as a specific example.
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[0025]
Further, in the first embodiment, the contact position of at least one of the surface of the
vibrating film 110 and the surface of the fixed electrodes 120a and 120b is characterized in that
the insulating process is performed.
Then, a bias voltage is applied between the conductive layer of the diaphragm 110 and the fixed
electrodes 120a and 120b by the bias power supply 130, and an alternating current signal such
as an audio signal is applied by the signal sources 150a and 150b having opposite phases. .
[0026]
In addition, the fixed electrodes 120a and 120b are characterized in that a metal wire configured
to have a repeating shape of unevenness or waveform is a meshed mesh in a mesh shape.
When the surfaces of the metal wires of the fixed electrodes 120a and 120b are insulated, the
vibrating film 110 may have a conductive layer on the surface.
[0027]
When the surfaces of the metal wires of the fixed electrodes 120a and 120b are not subjected to
the insulation treatment, the vibrating film 110 may have an insulating layer on the surface and a
conductive layer inside thereof.
In this case, by overlapping the vibrating films having the conductive layers on one side such that
the conductive layers face each other on the center side, it is possible to realize the vibrating film
110 in a state in which the surfaces are insulated.
[0028]
When the fixed electrodes are arranged on both sides of the vibrating film 110 as described
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above, the conductive film may have a high resistance value since the vibrating film 110 may be
charged with a bias voltage.
In the case where the fixed electrode is disposed only on one surface of the vibrating film 110 as
in the modification described later, an alternating current signal flows in the conductive layer of
the vibrating film 110, so it is desirable to set a low resistance value.
[0029]
Note that the holding portion 101 as a frame holds the whole integrally so that the distance
between the fixed electrodes 120a and 120b and the vibrating membrane 110 is kept constant.
The holding unit 101 may hold the entire periphery of the electrostatic speaker 100, or may be a
member that transmits sound and holds the entire surface of the sound emitting unit.
[0030]
When configured as described above, the vibrating membrane 110 vibrates according to the AC
signal in the space not in contact with the fixed electrodes 120a and 120b.
Here, the force acting on the diaphragm 110 of the electrostatic speaker is in inverse proportion
to the square of d, where d is generally the distance between the fixed electrodes 120 a and 120
b and the diaphragm 110.
That is, in the first embodiment, the fixed electrodes 120a and 120b are in contact with the
vibrating membrane 110 at a plurality of points or a plurality of lines, and d is determined by the
thickness of the insulating film. It is possible to make d extremely small. That is, since the
vibrating membrane 110 and the fixed electrodes 120a and 120b are in contact with each other
at a plurality of points or lines in a state where the surfaces are insulated, the distance d between
them becomes the shortest, and between the vibrating membrane and the fixed electrode The
force acting on the vibrating membrane is greater than that of the conventional electrostatic
speaker provided with a gap.
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[0031]
Moreover, the mesh ¦ network which the metal wire comprised so that it might become repeating
shape of an unevenness ¦ corrugation or a waveform was braided in the grid ¦ lattice form was
used as a fixed electrode, and the vibrating film and the fixed electrode (mesh) had the surface
insulated. In the state, since the plurality of points or lines are in contact with each other, the
mutual distance d is shortest, and acts on the diaphragm compared to the conventional
electrostatic speaker in which a gap is provided between the diaphragm and the fixed electrode.
Increase the power of
[0032]
FIG. 6 is a characteristic diagram showing an example of frequency characteristics when the
electrostatic loudspeaker according to the first embodiment is configured.
Here, the DC bias power supply 130 is set to 200 V, the signal source 150 a is set to 400 Vp-p,
and the signal source 150 b is set to 400 Vp-p. In the case of the electrostatic loudspeaker
according to this embodiment, a sound pressure of about 110 dB (1 m) with a flat frequency
characteristic is realized in the ultra high frequency range of 30 kHz or more.
[0033]
In addition, in the thing of the conventional general structure of the magnitude ¦ size equivalent
to the electrostatic-type speaker used for experiment, the frequency characteristic tends to fall
gradually by a super-high region. That is, the superiority of the electrostatic loudspeaker
according to the present embodiment is clear even in comparison with conventional general
ones.
[0034]
In addition, even if electrostatic speakers of other sizes and shapes are compared between those
of the prior art and those of the present embodiment, similar effects can be obtained. Further, the
force F acting on the diaphragm 110 of the electrostatic speaker is in inverse proportion to the
square of d as described above, and also in proportion to the bias voltage V by the bias power
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supply 130. Therefore, since the force F acting on the vibrating film becomes large by being able
to make d extremely smaller than in the past, it is possible to obtain a sufficient force F even if
the bias voltage V is lowered than in the past.
[0035]
For example, it becomes possible to reduce the bias voltage, which conventionally required
several thousand volts, to several hundred volts. In addition, by optimizing the distance between
the vibrating membrane 110 and the fixed electrodes 120a and 120b, the density of arranging
the metal wires of the fixed electrodes 120a and 120b, and the like, it is also possible to set a
bias voltage that can be driven by a battery.
[0036]
Moreover, since it is a fixed electrode by a metal wire or a metal stick ¦ rod, compared with metal
plates, such as the conventional punching metal, light transmittance is also improved. Moreover,
since it is a fixed electrode by a metal wire or a metal rod, compared with conventional metal
plates, such as a punching metal, pliability can be realized and it becomes easy to constitute by
curved surfaces other than a plane etc. Alternatively, the electrostatic speaker configured as a flat
surface may be curved to be curved.
[0037]
<Modification (1) of the First Embodiment> The fixed electrodes 120a and 120b described above
are woven such that metal wires configured to have a repeating shape of unevenness or
waveform are approximately orthogonal to each other, but 30 ° It may be an angle in two
directions other than the substantially orthogonal angle such as 120 °.
[0038]
<Modification (2) of First Embodiment> In the above-described fixed electrodes 120a and 120b,
metal wires in two directions configured to have a repeating shape of unevenness or waveform
are woven substantially orthogonal to each other. Fixed in combination of three or more
directions by combining approximately straight metal bars with metal wires in three or more
directions configured to have a repeating shape of unevenness or waveform, or a metal wire with
a repeating shape of unevenness or waveform An electrode may be used.
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[0039]
<Modified Example of the First Embodiment (3)> The fixed electrodes 120a and 120b described
above are formed by meshing so that metal wires configured to have a repeating shape of
unevenness or waveform are substantially orthogonal to each other. The
On the other hand, a reciprocator structure (a structure in which a plurality of wires or rods are
arranged in one direction) is formed by arranging a plurality of metal wires configured to have a
repeating shape of the unevenness or waveform in one direction. It may be.
[0040]
<Modification (4) of the First Embodiment> In the above specific example, the fixed electrodes
120a and 120b are disposed so as to sandwich the vibrating membrane 110, but only one of the
fixed electrodes may be provided. .
That is, it is possible to realize an electrostatic speaker even with the vibrating film 11 and the
fixed electrode 120 of only one. In this case, not only the bias voltage but also an alternating
current signal is applied to the vibrating membrane 110. Therefore, the vibrating membrane 110
may have a resistance value low enough to flow an alternating current signal from the signal
source 150.
[0041]
Second Embodiment FIG. 3 is an explanatory view schematically showing a configuration of an
electrostatic loudspeaker 100 according to a second embodiment of the present invention. FIG. 4
is a perspective view schematically showing the fixed electrode and the diaphragm used in the
electrostatic speaker 100 (see FIG. 3) according to the second embodiment of the present
invention.
[0042]
In this second embodiment, the fixed electrodes 120c and 120d are made of metal wires or metal
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rods that contact the vibrating membrane 110 with a plurality of points or a plurality of lines
instead of the conventional metal perforated plate such as punching metal. It is characterized by
using a fixed electrode.
[0043]
Further, in the second embodiment, the contact position of at least one of the surface of the
vibrating film 110 and the surface of the fixed electrodes 120c and 120d is characterized in that
the insulation processing is performed.
Then, a bias voltage is applied between the conductive layer of the diaphragm 110 and the fixed
electrodes 120c and 120d by the bias power supply 130, and an alternating current signal such
as an audio signal is applied by the signal sources 150a and 150b having opposite phases. .
[0044]
In addition, the fixed electrodes 120c and 120d are not general nets (see FIG. 2) in which the
concavo-convex or corrugated repetitive shapes of the first embodiment are combined (see FIG.
2), but substantially straight metal wires or metal rods Are combined in such a way as to be
substantially orthogonal.
[0045]
Therefore, in the second embodiment, among the metal wires or metal rods of the fixed
electrodes 120c and 120d, the metal wire or metal rod disposed on the side in contact with the
vibrating film 110 contacts the vibrating film 110 with a plurality of wires. It will be in the state.
[0046]
In addition, the conductive wire in a claim is a wire which has electroconductivity, and is a wire
comprised with the material which has various electroconductivity, such as a metal, an
electroconductive fiber, carbon.
Hereinafter, in this embodiment, a metal wire will be described as a specific example.
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Further, the conductive rod in the claims is a rod having conductivity, and is a rod made of
various conductive materials such as metal, conductive fiber, carbon and the like. Hereinafter, in
this embodiment, a metal rod will be described as a specific example.
[0047]
When the surfaces of the metal wires of the fixed electrodes 120c and 120d are subjected to
insulation processing, the vibrating film 110 may have a conductive layer on the surface. When
the surfaces of the metal wires of the fixed electrodes 120c and 120d are not subjected to the
insulation treatment, the vibrating film 110 may have an insulating layer on the surface and a
conductive layer in the inside thereof. In this case, by overlapping the vibrating films having the
conductive layers on one side such that the conductive layers face each other on the center side,
it is possible to realize the vibrating film 110 in a state in which the surfaces are insulated.
[0048]
When the fixed electrodes are arranged on both sides of the vibrating film 110 as described
above, the conductive film may have a high resistance value since the vibrating film 110 may be
charged with a bias voltage. In the case where the fixed electrode is disposed only on one surface
of the vibrating film 110 as in the modification described later, an alternating current signal
flows in the conductive layer of the vibrating film 110, so it is desirable to set a low resistance
value.
[0049]
Note that the holding portion 101 as a frame holds the whole integrally so that the distance
between the fixed electrodes 120c and 120d and the vibrating membrane 110 is kept constant.
The holding unit 101 may hold the entire periphery of the electrostatic speaker 100, or may be a
member that transmits sound and holds the entire surface of the sound emitting unit.
[0050]
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And when comprised as mentioned above, the diaphragm 110 vibrates according to an
alternating current signal in the space which is not in contact with fixed electrode 120c, 120d.
Here, the force acting on the diaphragm 110 of the electrostatic speaker is in inverse proportion
to the square of d, where d is generally the distance between the fixed electrodes 120 c and 120
d and the diaphragm 110. That is, in the second embodiment, the fixed electrodes 120c and
120d are in contact with the vibrating membrane 110 at a plurality of points or a plurality of
lines, and d is determined by the thickness of the insulating film. It is possible to make d
extremely small. That is, since the vibrating membrane 110 and the fixed electrodes 120c and
120d are in contact with each other by a plurality of lines in a state where the surfaces are
insulated, the distance d between them is shortest and a gap is formed between the vibrating
membrane and the fixed electrode. The force acting on the diaphragm is greater than that of the
conventional electrostatic speaker provided.
[0051]
Here, a substantially straight metal wire or a metal rod is used as a fixed electrode in which grids
are combined, and the vibrating membrane and the fixed electrode (net) are mutually separated
by a plurality of lines in a state where the surfaces are insulated. Since they are in contact with
each other, the distance d between them becomes shortest, and the force acting on the
diaphragm becomes large as compared with the conventional electrostatic loudspeaker in which
a gap is provided between the diaphragm and the fixed electrode.
[0052]
Further, the force F acting on the diaphragm 110 of the electrostatic speaker is in inverse
proportion to the square of d as described above, and also in proportion to the bias voltage V by
the bias power supply 130.
Therefore, since the force F acting on the vibrating film becomes large by being able to make d
extremely smaller than in the past, it is possible to obtain a sufficient force F even if the bias
voltage V is lowered than in the past.
[0053]
For example, it becomes possible to reduce the bias voltage, which conventionally required
several thousand volts, to several hundred volts. In addition, by optimizing the distance between
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the vibrating membrane 110 and the fixed electrodes 120c and 120d, the density of arranging
the metal wires of the fixed electrodes 120c and 120d, and the like, it is possible to set a bias
voltage that can drive a battery.
[0054]
Moreover, since it is a fixed electrode by a metal wire or a metal stick ¦ rod, compared with metal
plates, such as the conventional punching metal, light transmittance is also improved. Moreover,
since it is a fixed electrode by a metal wire or a metal rod, compared with conventional metal
plates, such as a punching metal, pliability can be realized and it becomes easy to constitute by
curved surfaces other than a plane etc. Alternatively, the electrostatic speaker configured as a flat
surface may be curved to be curved.
[0055]
<Modification (1) of the Second Embodiment> The fixed electrodes 120c and 120d described
above are woven such that substantially straight metal wires or metal rods are substantially
orthogonal, but substantially orthogonal such as 30 ° or 120 ° It may be two angles other than
the angle of
[0056]
<Modified Example of the Second Embodiment (2)> The fixed electrodes 120c and 120d
described above are substantially linear metal wires or metal rods combined in two directions,
but metal wires or metal rods in three or more directions are combined. Fixed electrodes may be
used.
[0057]
<Modified Example of the Second Embodiment (3)> The fixed electrodes 120c and 120d
described above have a lattice structure in which substantially linear metal wires or metal rods
are combined in two directions, but a plurality of fixed electrodes in one direction are used. It
may be a fixed electrode in which a metal wire or a metal rod is combined, that is, a connecting
element structure in which a plurality of wires are arranged in one direction (a structure in which
a plurality of lines or rods are arranged in one direction).
[0058]
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<Modification (4) of Second Embodiment> In the above specific example, the fixed electrodes
120c and 120d are disposed so as to sandwich the vibrating membrane 110, but only one of the
fixed electrodes may be provided. .
That is, it is possible to realize an electrostatic speaker even with the vibrating film 11 and the
fixed electrode 120 of only one.
In this case, not only the bias voltage but also an alternating current signal is applied to the
vibrating membrane 110.
Therefore, the vibrating membrane 110 may have a resistance value low enough to flow an
alternating current signal from the signal source 150.
[0059]
The fixed electrodes 120c and 120d described above are woven such that substantially straight
metal wires or metal rods are substantially orthogonal, but two angles other than approximately
orthogonal angles such as 30 ° and 120 ° may be used. Good.
[0060]
Third Embodiment FIG. 5 is an explanatory view schematically showing a configuration of an
electrostatic loudspeaker 100 according to a third embodiment of the present invention.
[0061]
In the third embodiment, the electrostatic loudspeaker according to the first embodiment or the
electrostatic loudspeaker according to the second embodiment is laminated.
In practice, a plurality of layers of the combination of the vibrating membrane 110 and the fixed
electrode 120 shown as the modified example (4) of the embodiment is included.
[0062]
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That is, two or more n diaphragms 110 and n + 1 fixed electrodes are alternately stacked and
arranged.
In this case, it is necessary to adjust the phase of the signal source and the direction of the bias
voltage so that the phase of vibration is aligned in each layer.
[0063]
In this embodiment, since the fixed electrode by the metal wire or the metal rod of the first
embodiment or the second embodiment is used, it is compared with the electrostatic type
speaker using a metal plate such as a conventional punching metal and the air gap. Thus, it
becomes possible to maintain a thin state even when stacked.
[0064]
Therefore, even when a plurality of layers are laminated, the frequency at which the thickness by
lamination reaches λ / 2 is higher than in the conventional case, that is, the upper limit
frequency of reproduction is higher than in the conventional case.
For this reason, the conventional problem that it becomes difficult to reproduce the high region
having a short wavelength due to the laminated structure is solved.
[0065]
Therefore, even when sound pressure is increased by layering, it can be used for applications
such as high frequency reproduction and ultrasonic wave generation. In addition, although a
mode that the electrostatic-type speaker of 1st embodiment was laminated ¦ stacked is shown in
FIG. 5, it is also no problem at all to laminate ¦ stack the electrostatic-type speaker of 2nd
embodiment.
[0066]
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Moreover, since it is a fixed electrode by a metal wire or a metal stick ¦ rod, compared with metal
plates, such as the conventional punching metal, light transmittance is also improved. That is, it is
possible to maintain the light transmittance even in the laminated state.
[0067]
Moreover, since it is a fixed electrode by a metal wire or a metal rod, compared with conventional
metal plates, such as a punching metal, pliability can be realized and it becomes easy to
constitute by curved surfaces other than a plane etc. Alternatively, the electrostatic speaker
configured as a flat surface may be curved to be curved.
[0068]
<Modified Example of Third Embodiment> Also in the third embodiment, various fixed electrodes
can be used as in the first embodiment and the second embodiment described above.
[0069]
That is, although substantially straight metal wires or metal rods are woven so as to be
substantially orthogonal, angles of two directions other than substantially orthogonal angles such
as 30 ° and 120 ° may be used.
Further, although the substantially straight metal wires or metal rods are combined in two
directions, the fixed electrode may be a fixed electrode in which metal wires or metal rods in
three or more directions are combined.
[0070]
In addition, the above fixed electrode is a fixed electrode in which a plurality of metal wires or
metal rods in one direction are combined, that is, a train having a plurality of arranged in one
direction (a plurality of wires or rods in one direction May be arranged side by side.
[0071]
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Fourth Embodiment The above-described electrostatic speaker is an electroacoustic transducer,
which generates an AC signal by vibrating the diaphragm 110 by applying air vibration. It is also
possible to use as.
Also in this case, since d is small, it is possible to realize an electrostatic microphone with higher
efficiency than the conventional one. In addition, it is also possible to use an electrostatic
microphone that can lower the bias voltage than conventional. Moreover, it is also possible to
make it an electrostatic type sensor like an electrostatic type microphone.
[0072]
<Other Embodiments> In the above embodiment, the one in which the lines or the rods are
regularly arranged or knitted is taken as a specific example, but the present invention is not
limited to this. That is, even if it is a member in a state in which regular or irregular fibers are
collected, such as a non-woven fabric made of conductive fibers, it can be used as the fixed
electrode in each of the above embodiments. is there. Also in this case, it is possible to constitute
a fixed electrode which contacts the vibrating membrane at a line or point.
[0073]
It is a block diagram which shows the structure of the electrostatic-type speaker of 1st
embodiment of this invention. It is a perspective view showing composition of an electrostatic
type speaker of a first embodiment of the present invention. It is a block diagram which shows
the structure of the electrostatic-type speaker of 2nd embodiment of this invention. It is a
perspective view which shows the structure of the electrostatic-type speaker of 2nd embodiment
of this invention. It is a block diagram which shows the structure of the electrostatic-type speaker
of 3rd embodiment of this invention. It is a characteristic view showing the frequency
characteristic of the electrostatic type speaker of a first embodiment of the present invention. It
is a block diagram which shows the structure of the conventional electrostatic type speaker.
Explanation of sign
[0074]
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DESCRIPTION OF SYMBOLS 100 Electrostatic-type speaker 101 Holding part 110 Vibrating film
120a, 120b Fixed electrode 120c, 120d Fixed electrode 130 Bias power supply 150 Signal
source
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