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DESCRIPTION JP2009278377

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DESCRIPTION JP2009278377
The present invention provides a sound generator having excellent acoustic characteristics even
when an electrode material with low conductivity is used. SOLUTION: A sheet-like vibrating
portion 2 made of an elastomer or a piezoelectric polymer which is expanded or contracted
according to the electric field strength, and a pair of electrodes made of a conductive polymer
provided on both sides of the vibrating portion 2 to generate the electric field strength A
sounding body 1A comprising 3a and 3b and electrode terminals 4 provided on the electrodes 3a
and 3b, wherein the vibrating portion 2 is such that the thickness of the vibrating portion 2
decreases as the distance from the electrode terminals 4 increases. It is characterized in that it is
configured. [Selected figure] Figure 1
Pronunciation body
[0001]
The present invention relates to a sounding body used for a speaker.
[0002]
There have been active developments of high-range ambience acoustic devices for use in home
environments, including SHV (Super Hi-Vision).
In general, a certain number of speakers are often required to realize high-presence sensational
sound, but the method of installing a large number of speakers in a living room or the like is not
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1
familiar with the current living environment. Therefore, there is a demand for providing a thin
and lightweight speaker and a sound generator used for the speaker.
[0003]
Conventionally, as a sounding body used for a thin and lightweight speaker, Patent Document 1
discloses a sheet-like composite piezoelectric made of a flexible resin (for example, a
polyurethane resin) and a piezoelectric element (for example, a lead zirconate titanate ceramic) A
diaphragm (sound generator in the present invention) in which electrodes (for example,
aluminum films) are provided on both sides of the body is described. Further, in Patent Document
2, a piezoelectric material containing a ferroelectric complex oxide (for example, titanium lead
zirconate ceramic) having a predetermined dielectric constant, and an electrode (for example, a
silver film) formed on both sides of the piezoelectric material And a thin plate piezoelectric
element (sound generator in the present invention).
[0004]
In recent years, instead of the piezoelectric body or the piezoelectric material (hereinafter
referred to as a piezoelectric body) using the above-described ceramics etc., development of a
sound generator using an elastomer based on silicon or acrylic etc. has been advanced. And, the
elastomer has rubber-like flexibility even in air compared to the piezoelectric body, and there is
no restriction of the shape, etc., so it is easy to process, and transparency can be realized by
selecting the type of resin. Because of its merits, it is suitable for the development of a relatively
large-area sounding body. Also, development of a sound generator using PVDF (polyvinylidene
fluoride) as the above-mentioned piezoelectric material instead of titanium lead zirconate
ceramics has also been promoted. Also, PVDF, like elastomers, has the advantage of being
excellent in flexibility, transparency and processability, and so is suitable for the development of
a relatively large-area sounding body.
[0005]
In the sound generator using the above-mentioned elastomer, attractive force is generated
between the electrodes by Maxwell stress generated by voltage application. And, by this
attractive force, the elastomer is compressed and its thickness is changed. At this time, by
superimposing an audio signal on an appropriate DC bias voltage, the elastomer vibrates by
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expanding and contracting in all directions according to the voltage value, and a sound is
generated. JP-A-8-88896 (Claim 1, paragraph 0009, FIG. 1) JP-A 2001-57449 (Claim 1,
paragraph 0026, paragraph 0031, FIG. 1)
[0006]
However, in the case of a sound generator using the above-mentioned elastomer, it is necessary
to form metal electrodes on both sides of the elastomer by a method such as vapor deposition in
order to apply a voltage. Then, when a voltage is applied to the sounding body, the elastomer is
flexible and has a large stretch width, so there is a possibility that the metal electrode may inhibit
the deformation operation of the elastomer.
[0007]
Therefore, it has been studied to use a flexible electrode made of a conductive polymer instead of
the metal electrode. And, with the progress of development in recent years, many conductive
polymers exhibiting high conductivity have come to be known. However, in comparison with
metal electrodes, electrodes made of conductive polymers remain at a low conductivity at this
time. Therefore, in the case of passing a voltage over a large area electrode, a voltage drop
according to the distance from the electrode terminal can not be avoided. In general, the
elastomer also has a uniform thickness, and as a result, the electric field strength between the
electrodes decreases with the distance from the electrode terminal. And, since the attractive force
between the electrodes is proportional to the electric field strength, the degree of expansion and
contraction (vibration) of the elastomer generated by the attractive force between the electrodes
becomes smaller according to the distance from the electrode terminal. As a result, the entire
surface of the sounding body (elastomer) is equally difficult to vibrate, and there is a problem
that the acoustic characteristics are degraded. Similarly, even in the case of a sounding body
using PVDF that vibrates according to the electric field strength, the reduction of the electric field
strength due to the voltage drop according to the distance from the electrode terminal can not be
avoided, and the entire surface of the sounding body (PVDF) vibrates equally. It is difficult to do
so, and there is a problem that the acoustic characteristics deteriorate.
[0008]
Therefore, the present invention was conceived to solve such problems, and its object is to
provide a sound generator having excellent acoustic characteristics even when using a low
conductivity electrode material. is there.
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[0009]
In order to solve the above problems, the sound-producing body according to claim 1 is provided
on a sheet-like vibrating portion made of an elastomer or a piezoelectric polymer which stretches
or operates according to the electric field strength, and the electric field is provided on both sides
of the vibrating portion. A sounding body comprising: a pair of electrodes made of a conductive
polymer that generates strength; and an electrode terminal provided on the electrode, wherein
the vibrating portion is a portion of the vibrating portion when the distance from the electrode
terminal increases. It is characterized in that the thickness is reduced.
[0010]
According to the above configuration, the thickness of the vibrating portion decreases as the
vibrating portion increases in distance from the electrode terminal, so that a voltage drop occurs
between the electrodes depending on the distance from the electrode terminal. However, since
the distance between the electrodes decreases in accordance with the distance from the electrode
terminal, the electric field strength becomes constant at each point of the electrodes.
As a result, the entire surface of the sounding body (vibration portion) vibrates uniformly.
[0011]
In the sound generator according to the second aspect, the vibrating portion is formed in a
rectangular shape and is provided along two sides facing the electrode terminal, and at least one
of both surfaces of the vibrating portion is the vibration. The concave portion is formed such that
the thickness of the vibrating portion becomes thinner from the two sides of the portion toward
the center.
[0012]
According to the above configuration, by providing the recessed portion in the vibrating portion,
even if a voltage drop occurs in the voltage between the electrodes according to the distance
from the electrode terminal, the vibrating portion Since the thickness is reduced and the distance
between the electrodes is reduced, the electric field strength becomes constant at each point of
the electrodes.
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As a result, the entire surface of the sounding body (vibration portion) vibrates uniformly.
[0013]
In the sounding body according to claim 3, the vibrating portion is formed in a circular shape or
an elliptical shape, the electrode terminal is provided along the peripheral edge, and the vibrating
portion is provided on at least one of both surfaces of the vibrating portion. The concave portion
is formed such that the thickness of the vibrating portion becomes thinner from the peripheral
edge toward the center of the groove.
[0014]
According to the above configuration, the vibrating portion includes the recessed portion, so that
the thickness of the vibrating portion decreases from the periphery toward the center even if a
voltage drop corresponding to the distance from the electrode terminal occurs in the voltage
between the electrodes. Since the distance between the electrodes is reduced, the electric field
strength becomes constant at each point of the electrodes.
As a result, the entire surface of the sounding body (vibration portion) vibrates uniformly.
[0015]
The sound producing body according to claim 4 is a sound producing body in which a sound
producing body according to any one of claims 1 to 3 is formed by laminating two sheets and a
direct current voltage is applied between the electrodes. It is characterized in that the electrodes
on the high potential output side of the electrodes are stacked so as to face each other.
[0016]
According to the above configuration, since the sounding body is a stack of two sounding bodies,
the vibrating portion of the sounding body is divided into two, and the thickness of the vibrating
portion of each sounding body is reduced. When a direct current is applied to the sound source,
it is possible to lower the voltage applied to each sounding body.
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As a result, it is also possible to prevent an electric shock due to high potential.
In addition, since two sounding bodies are stacked so that the electrodes on the high potential
output side face each other, when a DC voltage is applied to the sounding body, only the
electrode on the ground potential (0 V) output side emits sounding body It becomes possible to
further prevent the electric shock by high potential since it exposes outside.
[0017]
A sound generator according to a fifth aspect is characterized in that a plurality of the laminates
are stacked.
[0018]
According to the above configuration, the vibrating body of the sounding body is four by the
sounding body being further stacked in a plurality of laminated bodies in which two sounding
bodies are stacked so that the electrodes on the high potential output side face each other. As a
result of the above division, the thickness of the vibrating portion of each sounding body is
further reduced, and when a DC voltage is applied to the sounding body, the voltage applied to
each sounding body can be further lowered.
In addition, it is possible to further prevent electric shock due to high potential. Furthermore, by
making the sounding body composed of a plurality of laminates (two sounding bodies), it is
possible to efficiently earn the amplitude of the entire sounding body.
[0019]
A sounding body according to claim 6 is a sounding body in which a plurality of the sounding
bodies according to any one of claims 1 to 3 are stacked, and an AC voltage is applied between
the electrodes, An insulating portion is provided between the electrodes of the sounding body.
[0020]
According to the above configuration, the vibrating body of the sounding body is divided into a
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plurality of parts by the sounding body being a lamination of a plurality of sounding bodies and
the insulating portion provided between the electrodes of adjacent sounding bodies. The
thickness of the vibrating portion of each sounding body becomes thinner, and when an AC
voltage is applied to the sounding body, it becomes possible to lower the voltage applied to each
sounding body.
As a result, it is also possible to prevent an electric shock due to high potential. In addition, when
the sounding body is composed of a plurality of sounding bodies, it is possible to efficiently earn
the amplitude of the entire sounding body.
[0021]
According to the sounding body according to the first to third aspects, the electric field strength
of the vibrating portion becomes constant, and the entire surface of the vibrating portion vibrates
uniformly, so that the acoustic characteristics become excellent. Then, the vibrating portion is
formed in a rectangular shape, and the sounding body provided with the electrode terminal on
two opposing sides thereof, or the vibrating portion is formed in a circular or oval shape, and the
sounding body provided with the electrode terminal at the periphery thereof Acoustic
characteristics are particularly excellent.
[0022]
According to the sound generator of the fourth to sixth aspects, since the voltage applied to each
sound generator is lowered while being excellent in the acoustic characteristics, it is excellent in
economy and safety. Further, according to the sound producing body of the fourth and fifth
aspects to which a DC voltage is applied, only the electrode on the ground potential output side is
exposed to the outside of the sound producing body, so that electric shock due to high potential
is further prevented. Safety is even better.
[0023]
In addition, the sound-producing body which concerns on Claims 1-6 is suitably utilized for the
thin and lightweight speaker which can be flexibly adapted to a domestic environment.
[0024]
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An embodiment of a sound generator according to the present invention will be described in
detail with reference to the drawings.
Here, FIG. 1 (a) is a perspective view showing the configuration of the sounding body, (b) is a
cross-sectional view taken along the line AA of (a), (c) is a cross-sectional view showing the
configuration of the modification. 1) shows the change in potential difference in the sounding
body of FIG. 1, (b) shows the change in thickness, (c) shows the change in electric field strength,
and FIG. 3 (a) is a perspective view showing the configuration of another embodiment of the
sounding body. (B) is a cross-sectional view taken along the line B-B of (a), (c) is a cross-sectional
view showing the configuration of the modification, FIG. 4 (a) is a change in potential difference
in the sounding body of FIG. Change of thickness, (c) is a figure showing change of electric field
strength.
[0025]
As shown in FIGS. 1 (a) and 1 (b), the sounding body 1A includes a vibrating portion 2, a pair of
electrodes 3a and 3b, and an electrode terminal 4, and the vibrating portion 2 includes a recess
5a. The vibrating portion 2 is formed of a sheet made of an elastomer or a piezoelectric polymer
which stretches or operates according to the electric field strength generated when a voltage is
applied to the pair of electrodes 3a and 3b. As the elastomer, polyurethane, natural rubber,
polypropylene, polybutylene terephthalate and the like are preferable, and as the piezoelectric
polymer, PVDF or a composite thereof is preferable, but other than the above as long as they are
excellent in flexibility, molding processability and high temperature durability. It may be
Moreover, when transparency is required for the sound-producing body 1A, it is preferable to
select an elastomer or a piezoelectric polymer excellent in transparency.
[0026]
The vibrating portion 2 is configured such that the thickness of the vibrating portion 2 decreases
as the distance L from the electrode terminal 4 provided on the electrodes 3a and 3b increases.
The thickness T1 of the end portion, which is the maximum thickness, is preferably about 200
μm in order to meet the demand for thinning and reducing the weight of the sounding body 1A.
The thickness T2 at the bottom of the concave portion 5a which is the minimum thickness is set
in consideration of the voltage drop according to the distance L from the electrode terminal 4,
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and specifically, is about 195 μm in an area of 297 mm × 210 mm.
[0027]
The electrodes 3a and 3b are sheet-like electrodes made of a conductive polymer that are
provided on both sides of the vibration unit 2 and generate a predetermined electric field
strength between the electrode 3a and the electrode 3b. The conductive polymer is a polymer
having a resistivity of 3 kΩ / □ or less, for example, polyethylene dioxythiophene is preferable,
but any polymer other than the above may be used if it is excellent in conductivity and flexibility.
Good. Moreover, when transparency is required for the sounding body 1A, it is preferable to
select a conductive polymer having excellent transparency. The thickness of the electrodes 3a
and 3b is preferably about 1 μm which does not inhibit the vibration of the vibrating portion 2
and is formed on both surfaces of the vibrating portion 2 by spin coating or the like.
[0028]
The electrode terminal 4 is a lead wire or the like for applying a high voltage between the
electrode 3a and the electrode 3b, and may be provided at the end of the electrodes 3a and 3b in
order not to inhibit the vibration of the vibrating portion 2. preferable. The connection between
the electrodes 3a and 3b and the electrode terminal 4 (conductor wire) may be point contact, but
line contact as shown in FIG. 1 (a) is preferable in order to achieve stability of application of high
voltage.
[0029]
Next, a preferred embodiment of the sound generator will be described. As shown in FIGS. 1A
and 1B, in the sounding body 1A, the vibrating portion 2 is formed in a rectangular shape, and is
provided along two sides facing the electrode terminal 4 and the vibrating portion It is preferable
that the recess 5 a be formed such that the thickness of the vibrating portion 2 becomes thinner
from the two sides of 2 toward the center. Specifically, the recess 5 a is configured by a flat
inclined surface 6 a with the center of the vibrating portion 2 as a valley. The details of the
vibrating portion 2, the electrode 3a (3b), and the electrode terminal 4 are as described above.
Further, as shown in FIG. 1 (c), the sounding body 1 </ b> A may have the recessed portions 5 a
formed on both sides of the vibrating portion 2.
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[0030]
In the sounding body 1A, changes in potential difference, thickness (vibration portion 2) and
electric field strength are as follows. Assuming that the conductivity of the electrodes 3a and 3b
is p, the length of the vibrating portion 2 (distance from the electrode terminal 4) is L, and the
cross-sectional area of the electrodes 3a and 3b is S, the resistance R of the electrodes 3a and 3b
is R = It can be expressed as pL / S.
[0031]
As shown in FIG. 2A, since the electrode terminal 4 of the sounding body 1A is provided along
the two opposing sides of the vibrating portion 2 (electrodes 3a and 3b) as shown in FIG. 2A, the
distance from the electrode terminal 4 is It is expressed as a linear function of L, and changes
linearly (voltage drops) with the center of the vibrating portion 2 as a valley. As shown in FIG. 2B,
the thickness (the vibrating portion 2) is expressed as a linear function of the distance L similarly
to the potential difference, and changes linearly with the center of the vibrating portion 2 as a
valley. As shown in FIG. 2C, the electric field strength is always constant. This is because the
potential drops at the center of the vibrating portion 2 (see FIG. 2A), but the thickness of the
vibrating portion 2 also decreases at the center (see FIG. 2B).
[0032]
As shown in FIGS. 3A and 3B, in the sounding body 1B, the vibrating portion 2 is formed in a
circular or elliptical shape, and the electrode terminal 4 is provided along the peripheral edge,
and the vibrating portion 2 is formed. It is preferable that the recess 5 b be formed so that the
thickness of the vibrating portion 2 becomes thinner from the peripheral edge toward the center.
Specifically, the concave portion 5b is configured by a curved inclined surface 6b with the center
of the vibrating portion 2 as a valley. The details of the vibrating portion 2, the electrode 3a (3b),
and the electrode terminal 4 are as described above. Further, as shown in FIG. 3C, the sounding
body 1B may have the recessed portions 5b formed on both sides of the vibrating portion 2.
[0033]
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In the sounding body 1B, changes in potential difference, thickness (vibration part 2) and electric
field strength are as follows. Further, the resistance R of the electrodes 3a and 3b can be
expressed by R = pL / S as in the case of the speaker 1A.
[0034]
As shown in FIG. 4A, since the electrode terminal 4 of the sounding body 1B is provided along
the periphery of the vibrating portion 2 (electrodes 3a and 3b) as shown in FIG. 4A, the center of
the vibrating portion 2 is a valley. It changes logarithmically with respect to the distance L from
the electrode terminal 4 (voltage drop). As shown in FIG. 4B, the thickness (the vibrating portion
2) changes logarithmically with respect to the distance L, with the center of the vibrating portion
2 as a valley, similarly to the potential difference. As shown in FIG. 4C, the electric field strength
is always constant. This is because the potential decreases at the center of the vibrating portion 2
(see FIG. 4A), but the thickness of the vibrating portion 2 is also thinner at the center (see FIG.
4B).
[0035]
Therefore, in the sounding bodies 1A and 1B, by forming the concave portions 5a and 5b in the
vibrating portion 2, the electric field intensity reduced due to the voltage drop is compensated by
reducing the thickness of the vibrating portion 2 Since the electric field strength at each point
can be made constant, the entire surface of the vibrating portion 2 vibrates uniformly, and the
acoustic characteristics become excellent.
[0036]
Next, another embodiment of the sound generator will be described with reference to the
drawings.
Here, FIGS. 5 (a) and 5 (b) are side views showing the configuration of another embodiment of
the sound generator according to the present invention. As shown in FIG. 5 (a), the sounding
body 1C is composed of a laminate 7 in which two sheets of the above-mentioned sounding body
1A (1B) (see FIGS. 1 (a) and 3 (a)) are stacked. A direct current voltage is applied between the
electrode 3a and the electrode 3b, and the electrodes 3a on the high potential output side of the
electrodes 3a and 3b are stacked so as to face each other. Further, the sounding body 1C may be
one in which a plurality of laminates 7 are stacked. The number of sounding members 1A (1B)
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constituting the sounding member 1C is preferably 2 to 10, and the total thickness of the
vibration portions 2 of the sounding members 1C is the end of the vibration portion 2 of each
sounding member 1A (1B) It is preferable to set it as about 200 micrometers in the sum total of
maximum thickness T1 of a part (refer FIG.1 (b), FIG.3 (b)). Furthermore, in the lamination of the
sounding body 1A (1B), it is preferable to bond the electrodes 3a to each other with a conductive
adhesive or the like. The details of the sounding body 1A (1B) are as described above.
[0037]
In the sounding body 1C, since the electrodes 3a on the high potential output side are stacked to
face each other, only the electrode 3b on the ground potential (0 V) output side is exposed to the
outside of the sounding body 1C. As a result, when the sounding body 1C is touched by mistake,
it becomes possible to prevent an electric shock due to a high potential (for example, 1500 V).
Further, since the sounding body 1C is composed of a plurality of sounding bodies 1A (1B), the
thickness of the vibrating portion 2 of each sounding body 1A (1B) becomes thin, and the voltage
applied to each sounding body 1A (1B) It is economical because it becomes possible to lower the
In addition, since the overall amplitude of the sounding body 1C can be efficiently obtained, the
acoustic characteristics of the sounding body 1C are further improved.
[0038]
As shown in FIG. 5 (b), the sounding body 1D is formed by laminating a plurality of the abovementioned sounding bodies 1A (1B) (see FIG. 1 (a) and FIG. 3 (a)). An alternating voltage is
applied between them, and an insulating portion 8 is provided between the electrode 3b and the
electrode 3a of the adjacent sounding body 1A (1B). And it is preferable that the vibration part 2
consists of piezoelectric polymers (PVDF etc.). The insulating portion 8 is made of a known
insulating material, and is preferably a sheet having a thickness of about 1 μm. And as for the
number of sounding body 1A (1B) which comprises sounding body 1D, two to four are
preferable, and the total thickness of vibration part 2 of sounding body 1D is the end of vibrating
part 2 of each sounding body 1A (1B) It is preferable to set it as about 100 micrometers by the
sum total of maximum thickness T1 of (refer FIG.1 (b), FIG.3 (b)).
[0039]
The sounding body 1D is composed of a plurality of sounding bodies 1A (1B), and the insulating
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portion 8 is provided between the sounding bodies 1A (1B), so the thickness of the vibrating
portion 2 of each sounding body 1A (1B) becomes thinner. Since it is possible to lower the
voltage applied to each sounding body 1A (1B), it is economical. Moreover, since the amplitude of
the entire sounding body 1D can be efficiently obtained, the acoustic characteristics of the
sounding body 1D are further improved.
[0040]
As mentioned above, although the best mode for carrying out the present invention has been
described in detail with reference to the drawings, the present invention is not limited to such an
embodiment, and appropriate changes can be made without departing from the spirit of the
present invention. It is possible.
[0041]
For example, the above-described sounding members 1A and 1B (see FIGS. 1A to 1C and 3A to
3C) change the thickness of the vibrating portion 2 by forming the concave portions 5a and 5b.
However, as shown in FIGS. 6 (a) to 6 (c) and FIGS. 7 (a) to 7 (c), the sounding body 1E in which
the thickness of the vibrating portion 2 is changed by forming the convex portions 9a and 9b. ,
1F may be.
Here, FIG. 6 (a) is a perspective view showing the configuration of another embodiment of the
sounding body, (b) is a sectional view taken along the line C-C of (a), and (c) is a sectional view
showing a modification. 7 (a) is a perspective view showing the configuration of another
embodiment of the sounding body, (b) is a cross-sectional view taken along the line DD of (a), and
(c) is a cross-sectional view showing a modified example. In the sounding bodies 1E and 1F, the
same components as those of the sounding bodies 1A and 1B are denoted by the same reference
numerals.
[0042]
In the sounding body 1E, the vibrating portion 2 is formed in a rectangular shape, the electrode
terminal 4 is provided at the center of the rectangular shape (between two facing sides), and two
sides (ends) from the center of the vibrating portion 2 The convex portion 9a is formed so that
the thickness of the vibrating portion 2 becomes thinner toward the portion. Specifically, the
convex portion 9a is configured by a flat inclined surface 6a with the center of the vibrating
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portion 2 as a mountain. The thickness t2 of the vibrating portion 2 is preferably about 200 μm
at the top of the convex part 9a which is the maximum thickness, and about 195 μm at the area
of 297 mm × 210 mm at the end which is the minimum thickness. In addition, the sounding
body 1E may have convex portions 9a formed on both sides of the vibrating portion 2.
Furthermore, in the sounding body 1E, although not shown, the potential difference and
thickness (the vibrating portion 2) are expressed as a linear function of the length of the
vibrating portion 2 (distance L from the electrode terminal 4). Although it changes linearly (it
decreases toward the end of oscillating part 2), electric field intensity is always constant. As in
the case of the sounding bodies 1A and 1B, a plurality of sounding bodies 1E may be stacked.
[0043]
In the sounding body 1F, the vibrating portion 2 is formed in a circular shape or an elliptical
shape, the electrode terminal 4 is provided at the center of the vibrating portion 2, and the
vibrating portion 2 is The convex portion 9 b is formed to be thinner. Specifically, the convex
portion 9 b is configured by a curved inclined surface 6 b with the center of the vibrating portion
2 as a mountain. The thicknesses t1 and t2 of the vibrating portion 2 are preferably about the
same as those of the sounding body 1E (convex portion 9a). In addition, the sounding body 1F
may have convex portions 9b formed on both sides of the vibrating portion 2. Furthermore, in
the sounding body 1F, although not shown, the potential difference and the thickness (the
vibrating portion 2) change logarithmically with respect to the distance L from the electrode
terminal 4 with the center of the vibrating portion 2 as a mountain (the vibrating portion 2) The
electric field strength is always constant. As in the case of the sounding bodies 1A and 1B, a
plurality of sounding bodies 1F may be stacked.
[0044]
(A) is a perspective view which shows a structure of the sounding body which concerns on this
invention, (b) is the sectional view on the AA line of (a), (c) is sectional drawing which shows the
structure of a modification. (A) is a figure which shows the change of the electrical potential
difference in the sounding body of FIG. 1, (b) shows the change of thickness, (c) shows the
change of electric field intensity. (A) is a perspective view showing the configuration of another
embodiment of the sounding body according to the present invention, (b) is a sectional view
taken along the line B-B of (a), and (c) is a sectional view showing the configuration of a
modification. is there. (A) is a figure which shows the change of the electrical potential difference
in the sounding body of FIG. 3, (b) shows the change of thickness, (c) shows the change of
electric field intensity. (A), (b) is a side view which shows the structure of another embodiment of
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the sound generator which concerns on this invention. (A) is a perspective view showing the
configuration of another embodiment of the sounding body according to the present invention,
(b) is a sectional view taken along the line C-C of (a), (c) is a sectional view showing the
configuration of a modification is there. (A) is a perspective view showing the configuration of
another embodiment of the sounding body according to the present invention, (b) is a sectional
view taken along the line DD of (a), and (c) is a sectional view showing the configuration of a
modification. is there.
Explanation of sign
[0045]
1A, 1B, 1C, 1D, 1E, 1F Sounding body 2 Vibrating portion 3a, 3b Electrode 4 Electrode terminal
5a, 5b Recess 6a, 6b Sloped surface 7 Laminated body 8 Insulating portion 9a, 9b Convex
portion
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