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JP2014146867

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DESCRIPTION JP2014146867
Abstract: In an electrostatic speaker that can be folded when not in use, a gap between a
vibrating body and a fixed pole is reliably secured during use to obtain stable sounding
characteristics. A vibrator (10) has elasticity. The fixed electrode 20A is formed longer than the
vibrating body 10 in the pulling direction in a state where no tension is applied to the vibrating
body 10. The spacer 50 defines a gap between the vibrating body 10 and the fixed pole 20A.
When the electrostatic speaker 1A is used, tension is applied to the vibrating body 10, and the
fixed electrode 20A is also pulled to be flush. Thereby, the gap of the air layer between the
vibrating body 10 and the fixed electrode 20A is uniformly formed in the plane at an interval
defined by the spacer. Since the gap is an air layer, the stiffness of the vibrator 10 can be
reduced and the lowest resonance frequency can be reduced, and the Q value at the lowest
resonance frequency will not be reduced more than necessary. Furthermore, a uniform gap is
formed, so that the contact of the vibrating body 10 to the fixed electrode 20A can be prevented,
and the generation of distortion noise can be prevented. [Selected figure] Figure 2
Electrostatic speaker
[0001]
The present invention relates to the structure of an electrostatic speaker.
[0002]
2. Description of the Related Art Conventionally, electrostatic speakers that can be folded and
stored small when not in use have been proposed.
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For example, Patent Document 1 describes that a support member in which hollow tubes are
connected in a rectangular frame shape is provided. When the speaker is used, air is injected into
the hollow interior to expand the support member, and the conductive cloth and the vibrator
adhered to the support member are spread to form a flat rectangular shape. Moreover, when not
using it, it is small-folded by evacuating the support member by removing the air inside.
[0003]
On the other hand, in the speaker, the vibrator may be pulled by a predetermined tension for
sound generation. For example, Patent Document 2 describes that a screen of a sheet-like base
material is used as a sounding body by vibration. The exciter is attached to the back of the screen
and a cone is mounted at the lower end of the screen to tension the screen. In addition, Patent
Document 3 discloses a flat speaker in which two short sides of a rectangular diaphragm are
bonded and fixed to a support frame in the form of a square frame, and a central portion of the
diaphragm is string vibration driven from the back side by a vibrator. Is described. The frequency
characteristic is adjusted by adjusting the longitudinal tension.
[0004]
JP, 2009-272861, A JP, 2007-65482, A JP, 2001-275, 187 A
[0005]
In the electrostatic speaker described in Patent Document 1, the conductive cloth, the vibrator,
etc. are expanded to a flat shape by injecting air into the hollow inside of the support member,
but the air pressure injected into the inside It is also conceivable that sufficient tension can not
be secured.
If the tension is insufficient, the gap between the vibrator and the conductive cloth may be
uneven, which may cause distortion in the frequency characteristics of sound generation. It is
also considered that stable sound quality can not be secured, which is a problem.
[0006]
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As for the point of securing tension, for example, in Patent Document 2, tension is applied by a
cone provided at the lower end of the screen used as a sounding body, and in Patent Document
3, tensile tension in the longitudinal direction of the vibrating membrane There are descriptions
such as adjusting the Both of them apply tension to the vibrator. However, any of the techniques
described in Patent Documents 2 and 3 is only to vibrate the vibrator by the exciter or the
vibrator. Therefore, these techniques can not be applied to the foldable electrostatic speaker
described in Patent Document 1.
[0007]
In addition, as described in Patent Document 1 and the like, in a conventional electrostatic
speaker, an elastic member may be interposed between the vibrating body and the conductive
cloth. Due to the presence of the elastic member, the drive of the vibrating body is limited, which
may result in an increase in so-called stiffness. As a result, the lowest resonance frequency of the
speaker may be increased to deteriorate the bass characteristic, which is not preferable. It is also
conceivable that the damping of the vibration of the vibrating body becomes large due to the
elastic member interposed between the vibrating body and the conductive cloth, and the Q value
at the lowest resonance frequency becomes smaller than necessary.
[0008]
The present invention has been proposed in view of the above problems, and in an electrostatic
speaker that can be folded when not in use, the gap between the vibrating body and the fixed
electrode is reliably ensured during use to obtain stable sounding characteristics. It is an object
of the present invention to provide an electrostatic speaker capable of
[0009]
An electrostatic speaker according to a technology disclosed in the present application includes a
vibrator, a fixed electrode, and a spacer.
The vibrator has elasticity and is driven in a tensioned state in a predetermined direction. The
fixed pole is opposed to the vibrating body, and the length in the predetermined direction is
longer than the vibrating body in a state in which no tension is applied to the vibrating body. The
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spacer defines a gap between the vibrating body and the fixed pole. During use of the
electrostatic speaker, tension is applied to the vibrator in a predetermined direction until tension
is applied to the fixed pole.
[0010]
In general, in an electrostatic loudspeaker having a small gap between the vibrating body and the
fixed pole, the stiffness of the vibrating body is considered to be dominated by the air layer
interposed between the vibrating body and the fixed pole. Therefore, when the air permeability
of the elastic member and the fixed pole interposed between the vibrating body and the fixed
pole is not sufficient, it is conceivable that the stiffness of the vibrating body is increased and the
minimum resonance frequency of the speaker is increased. . It is also conceivable that the
damping of the vibration of the vibrating body becomes large and the Q value at the lowest
resonance frequency becomes smaller than necessary.
[0011]
According to the configuration of the present application described above, the tension is applied
to the vibrating body in a predetermined direction until tension is applied to the fixed electrode
during use, whereby the fixed electrode is brought into a flush state. As a result, the gap between
the vibrating body and the fixed pole is uniform over the entire opposing region, and the distance
is the gap defined by the spacer. By applying tension to the vibrating body, a gap of the air layer
is provided between the vibrating body and the fixed electrode, so that the stiffness of the
vibrating body can be made a sufficiently small value, and the increase of the minimum
resonance frequency The bass characteristic in the speaker can be secured by suppressing. In
addition, since the gap of the air layer is provided between the vibrating body and the fixed
electrode and the elastic member is not interposed, the Q value at the lowest resonance
frequency is not reduced more than necessary. Furthermore, since the gap length can be adjusted
by the spacer, the vibrating body does not come into contact with the fixed electrode by driving,
and distortion of the sound generation characteristic caused by the contact can be prevented.
[0012]
Furthermore, in the electrostatic loudspeaker according to the technology disclosed in the
present application, the fixed pole is flexible. Thus, in use, tension can be applied to the fixed pole
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to make it flush, and the gap between the vibrating body and the fixed pole can be uniformly
secured on the opposing surface.
[0013]
Furthermore, in the electrostatic loudspeaker according to the technology disclosed in the
present application, the fixed electrode is laminated on the flexible sheet facing the vibrating
body, and the flexible sheet on the surface opposite to the opposing surface of the vibrating
body. And a plurality of electrodes juxtaposed in a predetermined direction. Thereby, in use,
tension is applied to the flexible sheet, and the gap between the vibrating body and the fixed
electrode can be uniformly secured on the facing surface.
[0014]
Furthermore, in the electrostatic loudspeaker according to the technology disclosed in the
present application, the fixed pole includes a plurality of electrodes juxtaposed in a
predetermined direction, and a flexible connecting member for connecting adjacent ones of the
plurality of electrodes. Prepare. Thereby, in use, tension is applied to the flexible connecting
member, and the gap between the vibrating body and the fixed electrode can be uniformly
secured on the facing surface.
[0015]
Furthermore, in the electrostatic loudspeaker according to the technology disclosed in the
present application, the fixed electrode is laminated on the flexible sheet facing the vibrating
body, and the flexible sheet on the surface opposite to the opposing surface of the vibrating
body. And a plurality of electrodes formed of a ferromagnetic material and juxtaposed in a
predetermined direction, and a coupled magnet member fixed to one of the plurality of
electrodes between adjacent electrodes and magnetically coupled to the other. Thereby, in use,
tension is applied to the flexible sheet, and the connecting magnet member is magnetically
coupled to the other adjacent electrode, so as to uniformly secure the gap between the vibrating
body and the fixed pole on the opposing surface. it can.
[0016]
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According to the electrostatic speaker according to the technology disclosed in the present
application, the gap between the vibrating body and the fixed pole is regulated by the spacer by
pulling the vibrating body in a predetermined direction and making the fixed pole flush in use. It
is possible to make the air layer uniformly have the distance of the gap being made. The air layer
can be uniformly secured by the gap of the spacer, and the lowest resonance frequency can be
sufficiently low, and the sound emission characteristics can be reduced in distortion.
[0017]
It is a disassembled perspective view which shows typically the structure of the electrostatic-type
speaker 1 of this application. It is sectional drawing of the up-down direction which shows the
structure of electrostatic-type speaker 1A of 1st Embodiment. It is sectional drawing of the updown direction which shows the structure of electrostatic-type speaker 1B of 2nd Embodiment. It
is sectional drawing of the up-down direction which shows the structure of 1st Embodiment of
electrostatic loudspeakers of 3rd Embodiment. It is sectional drawing of the up-down direction
which shows the structure of electrostatic loudspeaker 1D of 4th Embodiment. It is a
characteristic view showing that an SPL characteristic is improved in an electrostatic type
speaker in which a gap of an air layer was provided by a tension to a vibrating body and a
spacer.
[0018]
FIG. 1 schematically shows the structure of an electrostatic loudspeaker 1 according to an
embodiment of the present application. Only the configuration of each member is described. In
the direction in which tension is applied to the vibrating body, the length of the fixed electrode in
a state where no tension is applied is longer than the length of the vibrating body. The specific
configuration of each and the configuration in which the gap of the air layer is secured between
the vibrating body and the fixed electrode by the tension to the vibrating body will be described
later in the first to fourth embodiments of FIGS. Do. In the following description, in a plan view
from the right of the vibrator 10 and the fixed pole 20 described later, the direction connecting
the upper end and the lower end is defined as the vertical direction, and the end on the back side
A direction connecting a side and an end side on the near side is defined as the left and right
direction. The pulling direction of the vibrator is assumed to be the vertical direction.
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[0019]
The electrostatic speaker 1 is provided with the vibrating body 10 and the fixed electrode 20
facing each other. On the opposing surface of the vibrating body 10 and the fixed electrode 20, a
long rod-like spacer 50 is fixed which extends in the lateral direction at predetermined intervals
in the vertical direction. The gap between the vibrator 10 and the fixed electrode 20 is an air
layer, and the gap length is defined by the thickness of the spacer 50. In the fixed electrode 20,
the electrode 30 and the insulating material 40 are stacked such that the insulating material 40
faces the vibrating body 10. As described later, the vibrating body 10 has elasticity, and the
electrode 30 and the insulating material 40 have flexibility. Both are formed in a sheet shape that
can be bent, and the electrostatic speaker 1 is configured to be foldable.
[0020]
The electrostatic speaker 1 is generated by vibrating the vibrating body 10 by electrostatic force
generated by applying a potential difference between the vibrating body 10 and the fixed
electrode 20. In this case, the vibrating body 10 vibrates in the gap of the air layer provided
between the fixed electrode 20 and the vibrating body 10. Since the vibrating region is an air
layer, the stiffness of the vibrating body 10 can be reduced, and the lowest resonance frequency
of the speaker can be maintained low. Further, since the air layer between the vibrating body 10
and the fixed electrode 20 does not intervene an elastic member or the like, the vibration of the
vibrating body is not damped by the elastic member or the like, and the damping of the vibration
is small. As a result, the Q value at the lowest vibration frequency will not be smaller than
necessary. Furthermore, the gap between the vibrating body 10 and the fixed pole 20 is
sufficiently secured, and the vibrating body 10 vibrates within a range where interference does
not occur, such as contact with the fixed pole 20. It can be deterred. In the electrostatic type
speaker 1, in these configurations, the gap between the vibrating body 10 and the fixed pole 20
is defined by the spacer 50, and as described later, the gap can be reliably made by pulling the
vibrating body 10 in the vertical direction. It will be realized by securing it.
[0021]
The electrostatic speaker 1 is illustrated as a push-pull type in which fixed poles 20 are provided
on both sides of the vibrating body 10. In the push-pull type, the vibrating body 10 is driven
from both sides by setting the acoustic signal applied to the fixed pole 20 to the opposite phase
between the surfaces. The electrostatic speaker 1 can be configured as a single type in which a
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fixed electrode 20 for driving the vibrating body 10 is provided only on one side, in addition to
the push-pull type. The push-pull type configuration is a single type configuration developed on
both sides of the vibrating body 10. In the following description, although the push-pull type and
the single type are appropriately described, the basic configurations of both are the same, the
push-pull type speaker is configured as a single type, and the single type speaker is a push-pull
type. It goes without saying that the configuration can be changed as appropriate.
[0022]
The vibrating body 10 is formed in a sheet shape of a thin film having high elasticity to bending
and the like. For example, it is formed of an elastic material such as polyurethane blended with a
conductive material such as carbon particles. In addition to polyurethane, elastomers such as
silicon rubber and fluorine rubber may be used as an elastic material, and carbon particles and
the like may be compounded, or metal particles and carbon nanotubes may be compounded. The
vibrating body 10 particularly has elasticity that can be expanded and contracted in the vertical
direction. It is formed of a thin film having a predetermined elastic coefficient so as to vibrate
with a desired sound pressure level at least in an audio frequency band in accordance with a
predetermined acoustic signal. For example, it is formed with a thickness of several to several
tens of μm by the above-described material.
[0023]
The spacers 50 are long rod-like members extending in the left-right direction orthogonal to the
up-down direction to which tension is applied when the electrostatic speaker 1 is used, and are
provided side by side at predetermined intervals in the up-down direction. And the fixed
electrode 20. For example, a double-sided tape in which an adhesive is applied to the surface
where the vibrator 10 and the fixed electrode 20 face each other, or a resin (for example, a hot
melt material or the like) having thermoplasticity solid at normal temperature is used. The spacer
50 has the same thickness as the gap length between the vibrating body 10 and the fixed pole 20
when the electrostatic speaker 1 is used.
[0024]
FIG. 2 illustrates a cross-sectional view in the vertical direction which is a direction in which
tension is applied, in the electrostatic loudspeaker 1A of the first embodiment. A push-pull type is
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shown as an example. FIG. 2A is a diagram showing a state before the vibrator 10 and the fixed
electrode 20A are fixed. The same figure (B) is a figure which shows the state at the time of after
not adhering the vibrating body 10 and fixed pole 20A, and providing a tension |
tensile_strength. In the same figure (C), after the vibrator 10 and the fixed electrode 20A are
fixed, tension is applied to the vibrator 10 in the vertical direction until tension is applied to the
fixed electrode 20A, and the fixed electrode 20A is flush It is a figure which shows the used
condition made.
[0025]
The fixed electrode 20A has a laminated structure in which a sheet-like electrode 30A having
conductivity and a sheet-like insulating material 40A having insulation are bonded. All of them
are made of a material having flexibility and sound transparency and air permeability. An
acoustic signal is applied to the electrode 30A to drive the vibrating body 10. For example, the
electrode 30A is formed of a fabric including a gold thread or a silver thread, a fabric including
an aluminum thread member, a conductive wire mesh, or a resin film on which a conductive film
is vapor-deposited. Further, the insulating material 40A is formed of an insulating fiber or fabric
such as ester wool, cotton, silk or the like, or a member obtained by forming an insulating
synthetic resin into a sponge shape or a non-woven shape. In the case of fibers, woven fabrics,
sponges and non-woven fabrics, sound permeability and air permeability are secured.
[0026]
Further, the fixed pole 20A is longer than the vibrating body 10 in the vertical direction in which
tension is applied during use, and is fixed to the spacer 50 so as to bend in an unused state
where no tension is applied (FIG. 2, (A), See (B)). The flexible fixed electrode 20A and the elastic
vibrator 10 make it possible to fold it when not in use.
[0027]
In use, the vibrating body 10 is pulled in the vertical direction by the tension F, and the vibrating
body 10 is extended until tension is applied to the fixed electrode 20A. As a result, the fixed
electrode 20A is brought into a flush state, and a uniform gap is secured between the vibrating
body 10 and the fixed electrode 20A on the facing surface (see FIG. 2, (C)). The gap length G is
defined by the thickness of the spacer 50, and the vibrating body 10 and the fixed electrode 20A
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are held with a predetermined gap length G uniformly in the plane.
[0028]
Here, if the rod-like weight is provided at the lower end of the electrostatic speaker 1A, for
example, the tension F may be suspended by hooks or the like at the upper end of the
electrostatic speaker 1A at the time of use. Can be added by
[0029]
If the gap length G (the thickness of the spacer 50) is adjusted to a width longer than the
vibration amplitude by the drive of the vibrating body 10, the vibrating body 10 vibrating due to
sound generation does not contact or collide with the insulating material 40A. There is no nonlinear distortion in the characteristics.
A distortion sound does not mix in a pronunciation characteristic, and a smooth pronunciation
characteristic can be obtained. Further, the gap between the vibrating body 10 and the fixed
electrode 20A is formed by an air layer, and the air layer is opened at both ends in the left-right
direction of the long rod-like spacer 50, and the air permeability is well maintained. . Thereby,
the stiffness of the vibrating body 10 can be reduced. Also, the Q value at the lowest resonance
frequency will not be smaller than necessary. The lowest resonance frequency in the electrostatic
speaker 1A can be set to a sufficiently low frequency, and the Q value can be secured, whereby
the bass characteristic can be improved.
[0030]
FIG. 3 illustrates a cross-sectional view in the vertical direction which is a direction in which
tension is applied, in the electrostatic loudspeaker 1B according to the second embodiment. The
single type is illustrated as an example. FIG. 3A shows a state before the vibrator 10 and the fixed
electrode 20B are fixed, and FIG. 3B shows a state after the vibrator 10 and the fixed electrode
20B are fixed and no tension is applied. The state at the time of use is shown, and the figure (C) is
after fixing the vibrating body 10 and the fixed pole 20B, and applying tension to the vibrating
body 10 in the vertical direction until tension is applied to the fixed pole 20B. It is a figure which
shows the use condition by which the pole 20B was maintained flush | level.
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[0031]
The fixed electrode 20B includes an electrode 30B having a plurality of small pieces having
conductivity, instead of the electrode 30A of the fixed electrode 20A of the first embodiment. It
has a laminated structure in which small pieces of the electrode 30B are bonded to a sheet-like
insulating material 40B. The insulating material 40B is a member having the same configuration
and characteristics as the insulating material 40A. The electrode 30B has a configuration having
sound permeability and air permeability similarly to the electrode 30A, and can be configured of,
for example, a rigid body. A metal substrate or the like having a large number of holes, such as a
punching metal, may be considered. It goes without saying that sound permeability and air
permeability can be secured if there are a large number of openings. Further, instead of a rigid
body, it may be formed of a fabric including gold or silver, a fabric including a thread made of
aluminum, or a resin film on which a conductive film is vapor-deposited.
[0032]
In the vertical direction in which tension is applied during use, the insulating material 40B is
longer than the vibrating body 10 and is fixed to the spacer 50 so as to bend in an unused state
where no tension is applied (FIG. 3, (A), (B See)). Even if a plurality of small pieces constituting
the electrode 30B are rigid, they are separated from each other and bonded to the insulating
material 40B, or the small pieces themselves have flexibility, so that the fixed electrode 20B is
not used, etc. Folding is possible.
[0033]
At the time of use, by pulling the vibrating body 10 in the vertical direction by the tension F, the
vibrating body 10 is stretched until the insulating material 40B of the fixed electrode 20B is also
tensioned. Thus, the insulating material 40B and the electrode 30B having a plurality of small
pieces adhered to the insulating material 40B are held flush and a uniform gap is generated in
the plane between the vibrating body 10 and the fixed electrode 20B (FIG. 3). , (C)). The gap
length G is defined by the thickness of the spacer 50, and the vibrating body 10 and the fixed
electrode 20B are held with the predetermined gap length G uniformly in the plane.
[0034]
The gap length G (the thickness of the spacer 50) is adjusted to a width exceeding the vibration
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amplitude by the drive of the vibrating body 10, and the contact of the vibrating body 10
vibrating due to sound generation with the insulating material 40B is prevented. The lowest
resonance frequency in the electrostatic loudspeaker 1B is made sufficiently low by the
prevention of the mixing of distortion sound into the air and the gap formed by the air layer
between the vibrating body 10 and the fixed pole 20B. It is similar to the case of the electrostatic
loudspeaker 1A in that the bass characteristic is improved by being able to secure the Q value at
the lowest resonance frequency, which can be done.
[0035]
FIG. 4 illustrates a cross-sectional view in the vertical direction which is a direction in which
tension is applied, in the electrostatic loudspeaker 1C according to the third embodiment.
The single type is illustrated as an example. 4A shows a state before the vibrator 10 and the fixed
electrode 20C are fixed, and FIG. 4B shows a state after the vibrator 10 and the fixed electrode
20C are fixed and does not apply tension. In FIG. 6C, after the oscillator 10 and the fixed
electrode 20C are fixed, tension is applied to the oscillator 10 in the vertical direction until
tension is applied to the fixed electrode 20C. It is a figure which shows the use condition by
which was maintained flush.
[0036]
The insulating material 40C provided in the fixed electrode 20C is obtained by dividing the
insulating material 40B of the second embodiment according to the electrode 30C divided into
small pieces in the same manner as the electrode 30B. In addition, flexible small pieces 60 are
connected between the adjacent small pieces of electrodes 30C. The electrode 30C can be
configured by the same member as the electrode 30B and has the same characteristics. Further,
the insulating material 40C can be constituted by the same members as the insulating materials
40A and 40B and has the same characteristics. That is, sound transmission and air permeability
are secured, and it is flexible and foldable.
[0037]
In addition, the fixed electrode 20C is configured by connecting an electrode 30C constituted by
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small pieces and an insulating material 40C by a flexible small piece 60. The flexible small piece
60 is fixed to the spacer 50 so as to bend in an unused state which is longer than the vibrator 10
and does not apply tension in the vertical direction in which tension is applied during use (FIG. 4,
(A), See (B)). The plurality of small pieces constituting the electrode 30C and the insulating
material 40C may be made of a rigid body. Also in this case, as a result of being connected with
each other by the flexible pieces 60, they can be folded when not in use. Further, it is needless to
say that if the electrode 30C and the insulating material 40C have flexibility in addition to the
flexible small piece 60, folding is possible when not in use.
[0038]
At the time of use, by pulling the vibrating body 10 in the vertical direction by the tension F, the
vibrating body 10 is extended until the flexible small piece 60 of the fixed electrode 20C is also
tensioned. As a result, the electrode 30C of the fixed electrode 20C and the small pieces of the
insulating material 40C are held flush with each other, and a uniform gap is generated in the
plane between the vibrating body 10 and the fixed electrode 20C (see FIG. 4, (C) ). The gap
length G is defined by the thickness of the spacer 50, and the vibrating body 10 and the fixed
electrode 20C are held with a predetermined gap length G uniformly in the plane.
[0039]
The gap length G (the thickness of the spacer 50) is adjusted to a width exceeding the vibration
amplitude by the drive of the vibrator 10, and the contact or the like of the vibrator 10 vibrating
due to sound generation to the insulating material 40C is prevented. The lowest resonance
frequency of the electrostatic speaker 1C can be made sufficiently low by the prevention of the
mixing of distortion sound into the air and the gap formed by the air layer between the vibrating
body 10 and the fixed electrode 20C. Similar to the case of the electrostatic speakers 1A and 1B,
the bass characteristic is improved by ensuring the Q value at the lowest resonance frequency.
[0040]
FIG. 5 illustrates a cross-sectional view in the vertical direction which is a direction in which
tension is applied, in the electrostatic loudspeaker 1D of the fourth embodiment.
The single type is illustrated as an example. FIG. 5 (A) shows a state before the vibrator 10 and
the fixed electrode 20D are fixed, and FIG. 5 (B) shows a state after the vibrator 10 and the fixed
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electrode 20D are fixed and no tension is applied. In FIG. 6C, after the oscillator 10 and the fixed
electrode 20D are fixed, tension is applied to the oscillator 10 in the vertical direction until
tension is applied to the fixed electrode 20D. It is a figure which shows the use condition by
which was maintained flush.
[0041]
In the fixed electrode 20D, an electrode 30D divided into small pieces similar to the electrodes
30B and 30C is stacked on a sheet-like insulating material 40D having the same insulation
property as the insulating materials 40A and 40B. Here, the electrode 30D is made of a member
of a ferromagnetic material. In addition, a magnet chip 70 fixed to one of the electrodes and
detachably coupled to the other electrode is provided between the electrodes 30D of adjacent
chips. The electrode 30D has the same configuration as that of the electrode 30B except that it is
made of a ferromagnetic material, and has the same characteristics. In addition, the insulating
material 40D can be configured by the same members as the insulating materials 40A and 40B,
and has the same characteristics. That is, sound transmission and air permeability are secured,
and it is flexible and foldable.
[0042]
The fixed pole 20D is longer than the vibrating body 10 in the vertical direction in which tension
is applied during use in a state where the electrode 30D formed of small pieces is connected by
the magnet small piece 70. Then, in a non-used state where no tension is applied, the flexible
insulating material 40D is fixed to the spacer 50 so as to bend (see FIG. 5, (A) and (B)).
[0043]
At the time of use, by pulling the vibrating body 10 in the vertical direction by the tension F, the
vibrating body 10 is stretched until the insulating material 40D of the fixed electrode 20D is also
tensioned. As a result, the other end of the electrode 30D of the fixed pole 20D is attracted by the
magnet piece 70 to connect the adjacent electrodes flush. As a result, the electrode 30D and the
insulating material 40D are held flush and a uniform gap is generated in the plane between the
vibrating body 10 and the fixed electrode 20D (see FIG. 5, (C)). The gap length G is defined by the
thickness of the spacer 50, and the vibrating body 10 and the fixed pole 20D are held with the
predetermined gap length G uniformly in the plane.
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[0044]
The gap length G (the thickness of the spacer 50) is adjusted to a width exceeding the vibration
amplitude by the drive of the vibrating body 10, and the contact of the vibrating body 10
vibrating due to sound generation with the insulating material 40D is prevented. The lowest
resonance frequency in the electrostatic loudspeaker 1D can be made sufficiently low by the
prevention of the mixing of distortion sound into the air and the gap formed by the air layer
between the vibrating body 10 and the fixed pole 20D. Similar to the case of the electrostatic
speakers 1A, 1B, and 1C, the bass characteristic is improved by securing the Q value at the
lowest resonance frequency.
[0045]
FIG. 6 shows the effects of the first to fourth embodiments.
It is a figure which shows the SPL characteristic of electrostatic type speaker 1A-1D by the
structure of 1st-4th embodiment with respect to the SPL characteristic of a general electrostatic
type speaker. According to the electrostatic loudspeakers 1A to 1D of the first to fourth
embodiments, it can be confirmed that the Q value at the lowest resonance frequency is not
lowered more than necessary, and the SPL characteristic is improved in the low frequency band.
[0046]
Here, the "vertical direction" in the embodiment is an example of the "predetermined direction" in
the claims, and the "insulation material 40B" in the embodiment is an example of the "flexible
sheet" in the claims. "Magnet chip 70" in is an example of the "connection magnet member" in a
claim.
[0047]
As described above in detail, in the present embodiment, the flexible fixed electrodes 20A to 20D
and the elastic vibrator 10 face each other in the vertical direction of the electrostatic
loudspeakers 1A to 1D.
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A vibrating body 10 having a natural length not applied with tension and shorter than the fixed
poles 20A to 20D is provided, and a configuration in which the vibrating body 10 and the fixed
poles 20A to 20D are coupled by a spacer 50 is provided. Since the vibrator 10 having elasticity
and the fixed poles 20A to 20D having flexibility, the speaker can be in a folded state when not in
use. In use, tension in the vertical direction is applied to the vibrator 10, and the vibrator 10 is
extended until the fixed poles 20A to 20D are pulled in the vertical direction. Thereby, a gap of
the air layer defined by the spacer 50 can be formed between the vibrating body 10 and the
fixed electrodes 20A to 20D. Thereby, it can prevent that the vibrating body 10 to drive contacts
fixed pole 20A-20D, and generation | occurrence | production of distortion noise can be
prevented. Further, since the vibrating gap of the vibrating body 10 is formed by the air layer,
the stiffness of the vibrating body 10 can be made small. As a result, the lowest resonance
frequency can be reduced, and the speaker can be made to be able to sound well up to the bass
range. In addition, the Q value at the lowest resonance frequency does not become smaller than
necessary.
[0048]
The present invention is not limited to the above embodiment, and it goes without saying that
various improvements and changes can be made without departing from the spirit of the present
invention. For example, although a push-pull type is used only for the electrostatic speaker 1A
and the electrostatic speakers 1B to 1D are configured as a single type, the present invention is
not limited to this. The push-pull type only needs to have the same configuration on both sides of
the vibrator, and the single type only has a configuration on only one side of the push-pull type.
It goes without saying that any of the electrostatic speakers 1A to 1D can be configured in either
a push-pull type or a single type. Further, in the electrostatic speakers 1A to 1D according to the
present invention, the case has been described in which tension in the vertical direction is
applied by providing a rod-like weight at the lower end of the speaker and suspending the upper
end of the speaker on a hook or the like. It is not limited to this. It is needless to say that the
upper and lower ends may be urged outward.
[0049]
1, 1A, 1B, 1C, 1D Electrostatic speaker 10 Vibrator 20, 20A, 20B, 20C, 20D Fixed pole 50 Spacer
30, 30A, 30B, 30C, 30D Electrode 40, 40A, 40B, 40C, 40D Insulating material 60 flexible pieces
70 magnetic pieces
11-05-2019
16
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