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JP2004056378

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DESCRIPTION JP2004056378
An object of the present invention is to obtain a speaker capable of preventing damage or
deterioration. In the glass speaker 10, H ion and OH ion are generated in the vicinity of the
surface by irradiating the ion generation film 14 with ultraviolet light. Further, in the region A,
the suction electrode 16 sucks OH ions to leave H ions, and in the region B, the suction electrode
16 sucks H ions to leave OH ions. Furthermore, a voltage is applied between the front drive
electrode 20 and the rear drive electrode 22 by the drive power supply 24 to generate a drive
electric field, whereby the H ions and the OH ions are vibrated to generate sound waves. Sound
waves are transmitted. Here, in the glass speaker 10, since the conventional diaphragm is not
necessary, it is possible to prevent the breakage and the deterioration. Furthermore, since the
glass 12, the ion generation film 14, the suction electrode 16, the front drive electrode 20, and
the rear drive electrode 22 are all transparent, the glass speaker 10 can be transparent. [Selected
figure] Figure 1
スピーカ
TECHNICAL FIELD [0001] The present invention relates to a speaker for generating a sound
wave. [0002] As a transparent speaker, for example, there is an electrostatic type transparent
speaker described in Japanese Patent Application Laid-Open No. 10-191496. The electrostatic
transparent speaker includes a transparent fixing plate, and a transparent electrode film is
formed on the transparent fixing plate. A transparent diaphragm (diaphragm film) is provided in
front of the transparent fixing plate, and a transparent electrode film is also formed on the
transparent diaphragm. Here, when an acoustoelectric signal is applied between the pair of
transparent electrode films, the transparent diaphragm is vibrated by the fluctuation of the
voltage to generate a sound wave, whereby the sound wave is propagated. . However, in this
electrostatic transparent speaker, since the transparent diaphragm needs to be vibrated, the
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transparent diaphragm must be a very delicate film. For this reason, there is a possibility that the
transparent diaphragm may be easily broken due to a pencil bite or the like, and when the
transparent diaphragm is made of resin, there is a problem that the transparent diaphragm
(resin) is easily deteriorated. Further, as a speaker having no vibrating film, there is a speaker in
which a film-like piezoelectric element is attached to glass. However, since the piezoelectric
element can not be made transparent (sufficiently transparent), it has been impossible to make a
transparent speaker having no vibrating film. SUMMARY OF THE INVENTION It is an object of
the present invention to obtain a speaker capable of preventing breakage and deterioration in
consideration of the above facts. A speaker according to claim 1 comprises an ion generating
means for generating ions, and a drive electrode for vibrating an ion to generate a sound wave by
generating a predetermined drive electric field. And have. In the speaker according to the first
aspect, the ion generating unit generates the ions, and the drive electrode generates the
predetermined driving electric field, whereby the ions are vibrated to generate the sound waves.
Thereby, the sound wave is propagated. Here, in the loudspeaker according to the first aspect,
since the conventional diaphragm is not necessary, it is possible to prevent the breakage and the
deterioration. According to a second aspect of the present invention, there is provided the
speaker according to the first aspect, wherein at least one of the ion generating means and the
driving electrode is transparent or in the form of a thin line. In the speaker according to the
second aspect, at least one of the ion generating means and the drive electrode is made
transparent or in the form of a thin line, so that the speaker can be made transparent.
In the loudspeaker according to claim 3, in the loudspeaker according to claim 1 or 2, the ion
generating means attracts positive ions or negative ions when generating positive ions and
negative ions. It is characterized by having a suction electrode. In the speaker according to claim
3, when the ion generation means generates plus ions and minus ions, the suction electrode
sucks plus ions or minus ions. For this reason, it is possible to suppress neutralization due to
positive ions and negative ions generated by the ion generation means attracting and
recombining with each other by Coulomb interaction, and positive ions or negative ions can be
left. According to a fourth aspect of the present invention, there is provided the speaker
according to the third aspect, wherein the suction electrode is transparent or in a thin line shape.
In the speaker according to the fourth aspect of the invention, since the suction electrode is made
transparent or in the form of a thin line, the speaker can be made transparent even in the case
where the neutralization suppressing electrode is provided. According to a fifth aspect of the
present invention, in the loudspeaker according to any one of the first to fourth aspects, the
driving electrode is configured to generate positive ions and negative ions by the ion generating
means. Is characterized in that the vibration direction of the positive ion and the negative ion is
the same direction side. In the speaker according to claim 5, when the ion generating means
generates positive ions and negative ions, the drive electrodes make the vibration directions of
the positive ions and the negative ions in the same direction. For this reason, it is possible to
prevent the sound wave from being canceled and the sound wave from being difficult to be
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propagated when the vibration direction of the positive ion and the negative ion generated by the
ion generating means is in the opposite direction. According to a sixth aspect of the present
invention, in the speaker according to any one of the first to fifth aspects, the surface is flat or
curved, and the drive electrode is an ion in the vicinity of the surface. It is characterized in that it
vibrates. In the loudspeaker according to claim 6, the surface is flat or curved, and the drive
electrode vibrates ions in the vicinity of the surface. Therefore, sound waves can be generated
uniformly from the surface of the speaker, and the directivity of the sound waves can be
sharpened. DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 is a
front view of a glass speaker 10 according to a first embodiment to which the speaker of the
present invention is applied. It is shown, and in FIG. 2 a glass speaker 10 is shown in cross
section.
The glass speaker 10 according to the present embodiment has a flat plate shape, and includes a
transparent flat glass 12 as a substrate. The surface of the glass 12 is covered with an ion
generating film 14 as an ion generating means, and the ion generating film 14 is made
transparent, for example, by titanium dioxide or the like. As shown in FIG. 3, the ion generating
film 14 is irradiated with ultraviolet light from, for example, sunlight, a fluorescent lamp, or a
light bulb to allow radical ions (H <+>) from moisture in the air on the surface side (near the
surface) Ions (plus ions) and OH <-> ions (minus ions) are generated (generated). On the surface
of the glass 12, a plurality (22 in this embodiment) of elongated transparent film-like suction
electrodes 16 are formed (printed), and the plurality of suction electrodes 16 are arranged in
parallel at substantially equal intervals. Is located in The ion generating film 14 is not present on
the surface of the glass 12 where the suction electrodes 16 are disposed. Each suction electrode
16 is connected to a suction power supply 18 (bias power supply), and a predetermined number
(six in the present embodiment) of suction electrodes 16 at the center of the glass 12 and a
predetermined number (right) of the glass 12 right end In the embodiment, five suction
electrodes 16 and a predetermined number (three in the present embodiment) of suction
electrodes 16 at the left end of the glass 12 are connected to the positive side of the suction
power supply 18, while the center of the glass 12 is A predetermined number (four in the
present embodiment) of suction electrodes 16 between the predetermined number of suction
electrodes 16 and the predetermined number of suction electrodes 16 at the right end of the
glass 12, and a predetermined number of suction electrodes 16 at the center of the glass 12. A
predetermined number (four in the present embodiment) of suction electrodes 16 between the
predetermined number of suction electrodes 16 at the left end of the glass 12 and the suction
power supply 18 are connected to the negative side of the suction power supply 18. Therefore,
by applying a voltage to each suction electrode 16 by the suction power supply 18, each suction
electrode 16 connected to the positive side of the suction power supply 18 keeps H <+> ions
away and OH <-> ion Is attracted and the OH <-> ions are neutralized, while each attraction
electrode 16 connected to the negative side of the attraction power supply 18 attracts H <+> ions
while keeping OH <-> ions away and H <+> Ions are neutralized. As a result, in the area A where
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the respective suction electrodes 16 connected to the positive side of the suction power supply
18 are disposed, only H <+> ions remain, while the suction electrodes 16 connected to the
negative side of the suction power supply 18 In the arranged region B, only OH <-> ions remain,
and neutralization due to H <+> ions and OH <-> ions attracting and recombining with each other
by Coulomb interaction is suppressed.
A predetermined number (two in the present embodiment) of front drive electrodes 20 in the
form of long transparent films constituting drive electrodes are formed (printed) on the surface
of the glass 12. While being parallel to the respective suction electrodes 16 and disposed at the
center of the region B. In addition, a transparent film-like back drive electrode 22 constituting a
drive electrode is formed on the back surface of the glass 12, and the back drive electrode 22
covers a portion of the back surface of the glass 12 facing the ion generation film 14. . The ion
generation film 14 is not present on the surface of the glass 12 where the front drive electrode
20 is disposed. A drive power supply 24 is connected between the front drive electrode 20 and
the rear drive electrode 22, and is modulated between the front drive electrode 20 and the rear
drive electrode 22 by an audio signal or the like by the drive power supply 24. By applying a
voltage, a driving electric field indicated by electric field line E of FIG. 2 is generated. For this
reason, H <+> ions and OH <-> ions in the vicinity of the surface of the glass speaker 10 are
accelerated and vibrated by the driving electric field appearing on the front side of the glass
speaker 10, whereby this vibration is transmitted to the air. The generation of the sound wave
causes the sound wave to propagate in the air toward the front of the glass speaker 10 (see FIG.
4). As shown in FIG. 2, the direction of the drive electric field appearing on the front side of the
glass speaker 10 in the normal direction of the glass speaker 10 is opposite to that of the area A
and the area B. The vibration directions of H <+> ions and OH <-> ions are always in the same
direction in the normal direction of the glass speaker 10. Next, the operation of the present
embodiment will be described. In the glass speaker 10 having the above-described configuration,
the ion generation film 14 is irradiated with ultraviolet light, so that moisture in the air causes H
<+> ions and OH <-> ions in the vicinity of the surface of the glass speaker 10. Is generated. Each
attraction electrode 16 disposed in the region A attracts OH <-> ions to neutralize the OH <->
ions, and each attraction electrode 16 disposed in the region B is H < +> Aspirate ions to
neutralize H <+> ions. Therefore, it is possible to suppress neutralization due to H <+> ions
generated by the ion generation film 14 and OH <-> ions attracting each other due to Coulomb
interaction and recombining. In the region B, OH <-> ions can be left as well as <+> ions can be
left.
Further, a voltage modulated by an audio signal or the like is applied between the front drive
electrode 20 and the rear drive electrode 22 by the drive power supply 24 to generate a drive
electric field. As a result, the H <+> ion and the OH <-> ion are vibrated, and the vibration is
transmitted to the air to generate a sound wave, whereby the sound wave propagates in the air
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toward the front of the glass speaker 10 Ru. Further, the direction of the drive electric field
appearing on the front side of the glass speaker 10 in the normal direction of the glass speaker
10 is made to be the opposite direction between the area A and the area B, so that H <+> ions and
OH <−> The vibration direction with the ions is always on the same direction side in the normal
direction of the glass speaker 10. For this reason, the vibration direction of the H <+> ion and the
OH <-> ion generated by the ion generation film 14 is opposite to the normal direction of the
glass speaker 10 so that the sound wave is canceled and the sound wave is propagated. It can
prevent that it becomes difficult to be done. Here, in the glass speaker 10, since a conventional
vibrating film is not necessary, it is possible to prevent damage or deterioration. Furthermore, the
surface of the glass speaker 10 (the surface formed by the ion generation film 14, the suction
electrode 16 and the front drive electrode 20) is substantially planar, and H <+> ions are formed
near the surface of the glass speaker 10. OH <-> ions are vibrated. Therefore, sound waves can be
generated uniformly from the surface of the glass speaker 10, and the directivity of the sound
waves can be sharpened. Moreover, since the surface of the glass speaker 10 is substantially flat,
the diffusion of sound waves is suppressed. Thereby, the secrecy of the information by the glass
speaker 10 can be ensured without using a special device such as an earphone or a headphone.
Further, since the glass 12, the ion generation film 14, the suction electrode 16, the front drive
electrode 20 and the rear drive electrode 22 are all transparent, the glass speaker 10 can be
sufficiently transparent. Therefore, the glass speaker 10 can be applied to a door glass and a
window glass of a building such as a building or a car as well as a cover glass of a screen such as
a display, and other special speakers are attached thereto. You can eliminate the need.
Furthermore, when the glass speaker 10 is applied to a cover glass of a screen such as a display,
a sharp directional sound field can be created in the vicinity of the screen.
In addition, when the glass speaker 10 is applied to a door glass or window glass of a building, a
sound can be emitted from the door glass or window glass, so that the sound can be output
individually to a location close to people. As a result, accurate information transmission becomes
possible. Furthermore, when the glass speaker 10 is applied to a windshield of a car, sound can
be emitted from the windshield, and the degree of freedom in designing the car can be improved.
Furthermore, when the ion generating film 14 is titanium dioxide, the ion generating film 14 has
antibacterial properties. For this reason, even if stains such as fingerprints of hands are attached
to the surface of the glass speaker 10, the stains can be removed naturally. Further, since the
ions generated by the ion generation film 14 are H <+> ions and OH <−> ions, generation of
odor due to the ions can be prevented. Although the front drive electrode 20 is disposed at the
center of the region B in the present embodiment, the front drive electrode (drive electrode) may
be disposed at the center of the region A. Second Embodiment FIG. 5 is a cross-sectional view of a
glass speaker 30 according to a second embodiment to which the speaker of the present
invention is applied. The glass speaker 30 according to the present embodiment is flat as in the
first embodiment, and includes the glass 12 and the ion generation film 14. A predetermined
number of long transparent film-like first electrodes 32 and second electrodes 34 as suction
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electrodes and drive electrodes are provided on the surface of the glass 12 (in the present
embodiment, three first electrodes 32 and Eighteen second electrodes 34 are formed (printed).
The predetermined number of first electrodes 32 are arranged in parallel at substantially equal
intervals, and the predetermined number of second electrodes 34 are arranged in parallel at
substantially equal intervals between the first electrodes 32 and parallel to the respective first
electrodes 32 It is arranged. The ion generation film 14 is not present on the surface of the glass
12 on which the first electrodes 32 and the second electrodes 34 are disposed. As shown in FIG.
6, each first electrode 32 and each second electrode 34 are connected to the same suction power
source 18 (bias power source) as the first embodiment, and each first electrode 32 Is connected
to the positive side of the suction power supply 18, while each second electrode 34 is connected
to the negative side of the suction power supply 18. Therefore, by applying a voltage between
each of the first electrodes 32 and each of the second electrodes 34 by the suction power supply
18, each of the first electrodes 32 connected to the positive side of the suction power supply 18
has H < The second ion 34 connected to the negative side of the suction power supply 18 is OH
<-> ion while ion OH <-> is attracted while OH <-> ion is attracted while OH <-> ion is taken away.
While moving away, the H <+> ions are attracted by attracting the H <+> ions to neutralize them.
Thus, only H <+> ions remain in the region A (see FIG. 7) in which the first electrodes 32 are
disposed, while OH in the region B (see FIG. 7) in which the second electrodes 34 are disposed.
Only the-> ion remains, and neutralization due to H <+> ion and OH <-> ion attracting and
recombining with each other by Coulomb interaction is suppressed. A drive power supply 24
similar to that of the first embodiment is connected between each first electrode 32 and each
second electrode 34, and each drive electrode 24 is connected with each first electrode 32. By
applying a voltage modulated by an audio signal or the like to the second electrode 34, a drive
electric field indicated by electric force line E in FIG. 7 is generated. For this reason, H <+> ions
and OH <-> ions in the vicinity of the surface of the glass speaker 30 are accelerated and vibrated
by the driving electric field appearing on the front side of the glass speaker 30, and this vibration
is transmitted to the air The generation of the sound waves causes the sound waves to propagate
in the air toward the front of the glass speaker 30 (see FIG. 5). As shown in FIG. 7, the direction
of the drive electric field appearing on the front side of the glass speaker 30 in the normal
direction of the glass speaker 30 is opposite to the region A and the region B. The vibration
directions of the H <+> ions and the OH <-> ions are always in the same direction in the normal
direction of the glass speaker 30. As shown in FIG. 6, a coil 36 (low pass filter) is connected in
series to the suction power supply 18, and the negative side of the suction power supply 18 is
connected to each second electrode 34 via the coil 36. . On the other hand, a capacitor 38 is
connected in series to the drive power supply 24, and the drive power supply 24 is connected to
each first electrode 32 via the capacitor 38. Furthermore, the suction power supply 18 and the
coil 36, and the drive power supply 24 and the capacitor 38 are connected in parallel. Therefore,
the coil 36 prevents the alternating current (modulated current) from the drive power supply 24
from flowing to the side of the suction power supply 18 and causing a short circuit, and the
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direct current (bias current) from the suction power supply 18 does not Short circuited by the
capacitor 38 is prevented. Next, the operation of this embodiment will be described. In the glass
speaker 30 having the above-described configuration, the ion generation film 14 is irradiated
with ultraviolet light, whereby moisture in the air causes H <+> ions and OH <-> ions in the
vicinity of the surface of the glass speaker 30. Is generated.
In addition, each first electrode 32 disposed in the region A attracts OH <-> ions to neutralize the
OH <-> ions, and each second electrode 34 disposed in the region B The H <+> ions are attracted
to neutralize the H <+> ions. Therefore, it is possible to suppress neutralization due to H <+> ions
generated by the ion generation film 14 and OH <-> ions attracting each other due to Coulomb
interaction and recombining. In the region B, OH <-> ions can be left as well as <+> ions can be
left. Further, a voltage modulated by an audio signal or the like is applied between the respective
first electrodes 32 and the respective second electrodes 34 by the drive power supply 24 to
generate a drive electric field. As a result, the H <+> ion and the OH <-> ion are vibrated, and the
vibration is transmitted to the air to generate a sound wave, whereby the sound wave propagates
in the air toward the front of the glass speaker 30. Ru. Further, the direction in the normal
direction of the glass speaker 30 of the drive electric field appearing on the front side of the
glass speaker 30 is made to be the opposite direction in the area A and the area B, so that H <+>
ions and OH <−> The vibration direction with the ions is always on the same direction side in the
normal direction of the glass speaker 30. Therefore, the vibration direction of the H <+> ions and
the OH <-> ions generated by the ion generation film 14 is opposite to the normal direction of the
glass speaker 30, whereby the sound wave is canceled and the sound wave is propagated. It can
prevent that it becomes difficult to be done. Here, also with the glass speaker 30 according to the
present embodiment, the same effect as the glass speaker 10 according to the first embodiment
can be obtained. In the present embodiment, the coil 36 is connected in series to the suction
power supply 18, but when it is difficult to install the coil 36, as shown in FIG. Alternatively, a
configuration may be adopted in which a resistor 40 (for example, having a resistance value of
about 100 kΩ to about 100 MΩ) is connected in series to the suction power supply 18. It can
prevent flowing to the side and shorting. In addition, since a current does not flow much in the
resistor 40, even if the resistor 40 having a large resistance value is connected to the suction
power supply 18, the voltage drop due to the resistor 40 can be reduced.
Furthermore, in the first embodiment, the suction electrode 16 and the front drive electrode 20
are made transparent, and in the second embodiment, the first electrode 32 and the second
electrode 34 are made transparent. The suction electrode, the front drive electrode (drive
electrode), or the first electrode or the second electrode (suction electrode and drive electrode)
may be in the form of fine lines (in particular, fine lines). In this case However, the glass speaker
(speaker) can be made transparent. In the first and second embodiments, the surface of the glass
speakers 10 and 30 is flat, but the surface of the glass speaker (speaker) is curved. It is good also
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as composition. At this time, when the surface of the glass speaker is concave, the convergence of
the sound wave can be enhanced, while when the surface of the glass speaker is convex, the
diffusion of the sound can be enhanced. Furthermore, in the first embodiment and the second
embodiment, ions are formed on the surface of the glass 12 on which the suction electrode 16
and the front drive electrode 20 or the first electrode 32 and the second electrode 34 are
disposed. Although the generation film 14 is not present, a suction electrode, a front drive
electrode (drive electrode), or a first electrode or a second electrode (suction electrode and drive
electrode) are formed on the surface of the ion generation film (ion generation means). It is good
also as composition. In the first and second embodiments, while the suction electrode 16 or the
first electrode 32 disposed in the area A is connected to the positive side of the suction power
supply 18, the area B is connected to the area B. Although the suction electrode 16 or the second
electrode 34 disposed is connected to the negative side of the suction power supply 18, the
suction electrode or the first electrode disposed in the region A is connected to the negative side
of the suction power supply, The configuration may be such that the suction electrode or the
second electrode disposed in B is connected to the positive side of the suction power source, in
which case only OH <-> ions remain in region A, while H <+ in region B. > Only ions remain.
Further, in the first embodiment and the second embodiment, although the substrate of the glass
speakers 10 and 30 (speaker) is the glass 12, the substrate of the speaker is other insulator In
this case, if the insulator is not transparent, the ion generation film (ion generation means), the
suction electrode, the front drive electrode and the back drive electrode (drive electrode) or the
first one in the first embodiment may be used. The ion generating film (ion generating means),
the first electrode and the second electrode (suction electrode and driving electrode) in the
second embodiment need not be transparent or in the form of thin lines, and may be metal films.
In the first and second embodiments, the ion generation means uses an ion generation film in
which radical ions are generated by ultraviolet light as the ion generation means. However, for
example, a suction electrode can be used as the ion generation means. A high voltage may be
applied between the first electrode and the second electrode to generate (generate) ions such as
ozone by silent discharge, and a glass speaker (speaker) may be used as an ion generating means.
The surface may be irradiated with ions. In these cases, the speaker can be configured such that
the substrate (insulator such as glass) does not exist. Example FIG. 9 is a side view showing an
example of the first embodiment or the second embodiment. In this embodiment, the glass
speakers 10 and 30 according to the first embodiment or the second embodiment is a cover
glass in front of the screen of the display panel 50, and the glass speakers 10 and 30. The
surface of the is directed to the operator 52. The operator 52 can operate the display panel 50
by touching the surface of the glass speakers 10 and 30. A fluorescent lamp 54 is provided in
front of and above the surface of the glass speakers 10 and 30, and ultraviolet rays from the
fluorescent lamp 54 are applied to the ion generation film 14 so that H <+> ions and OH < −>
Ions are generated, and furthermore, as in the first embodiment or the second embodiment, the
sound waves are generated by vibrating the H <+> ions and the OH <−> ions to generate sound
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waves. Are transmitted to the operator 52, particularly to the upper body. According to the
speaker of the first aspect of the present invention, the ion generation means generates the ions
and the drive electrode generates the predetermined drive electric field so that the ions are
vibrated to generate the sound waves. There is no need for a conventional vibrating membrane,
and damage or deterioration can be prevented. In the speaker according to claim 2, at least one
of the ion generating means and the drive electrode is made transparent or in a thin line shape,
so that the speaker can be made transparent. In the speaker according to claim 3, since the
suction electrode sucks positive ions or negative ions, neutralization due to Coulomb interaction
between positive ions and negative ions generated by the ion generation means can be
suppressed, Positive ions or negative ions can be left.
In the speaker according to the fourth aspect of the invention, since the suction electrode is made
transparent or in the form of a thin line, the speaker can be made transparent even in the case
where the neutralization suppression electrode is provided. In the speaker according to the fifth
aspect of the present invention, since the drive electrodes make the vibration directions of the
positive ions and the negative ions the same direction side, it is possible to prevent the sound
waves from being canceled and the sound waves being difficult to propagate. . In the loudspeaker
according to the sixth aspect, since the drive electrode vibrates the ions in the vicinity of the flat
or curved surface, the acoustic wave can be generated uniformly from the surface of the
loudspeaker, and the directivity of the acoustic wave can be generated. Can be sharpened. BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a glass speaker according to a
first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a glass
speaker according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view
showing an ion generation state in the glass speaker according to the first embodiment of the
present invention. FIG. 4 is a cross-sectional view showing a sound wave propagation condition in
the glass speaker according to the first embodiment of the present invention. FIG. 5 is a crosssectional view showing a glass speaker according to a second embodiment of the present
invention. FIG. 6 is a circuit diagram showing a connection state of a first electrode, a second
electrode, a suction power supply, a drive power supply and the like in a glass speaker according
to a second embodiment of the present invention. FIG. 7 is a cross-sectional view showing a
generation state of a driving electric field and flows of H <+> ions and OH <-> ions in a glass
speaker according to a second embodiment of the present invention. FIG. 8 is a circuit diagram
showing a connection state of a first electrode, a second electrode, a suction power supply, a
drive power supply and the like in a glass speaker according to another example of the second
embodiment of the present invention. FIG. 9 is a side view showing an example of the first
embodiment or the second embodiment of the present invention. [Explanation of the code] 10
glass speaker (speaker) 14 ion generating film (ion generating means) 16 suction electrode 20
front drive electrode (drive electrode) 22 back drive electrode (drive electrode) 30 glass speaker
(speaker) 32 first electrode (speaker) Suction electrode, drive electrode) 34 2nd electrode
(suction electrode, drive electrode)
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