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JPWO2014051006

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DESCRIPTION JPWO2014051006
Abstract The task is to obtain good sound pressure frequency characteristics. In order to solve
this subject, the sound generator (1) according to the embodiment includes a piezoelectric
element (excitation device) (5), a flat diaphragm (3), and a frame (2). The piezoelectric element
(5) vibrates when an electrical signal is input. The piezoelectric element (5) is attached to the
vibrating plate (3), and vibrates together with the piezoelectric element (5) by the vibration of the
piezoelectric element (5). The frame (2) is provided on the outer peripheral portion of the
diaphragm (3). Further, each corner of the inner peripheral surface of the frame (2) includes at
least a curved surface, and at least one of the corners differs in shape from the other corner.
Acoustic generator, acoustic generator and electronic device
[0001]
Embodiments of the disclosure relate to a sound generator, a sound generator and an electronic
device.
[0002]
Conventionally, an acoustic generator using a piezoelectric element is known (see, for example,
Patent Document 1).
Such a sound generator vibrates the vibration plate by applying a voltage to the piezoelectric
element attached to the vibration plate to vibrate the vibration plate, and outputs the sound by
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actively utilizing the resonance of the vibration.
[0003]
Moreover, since such a sound generator can use thin films, such as a resin film, for a diaphragm,
it can be comprised thinly and lightweight compared with a general electromagnetic speaker etc.
[0004]
In the case where a thin film is used as the diaphragm, the thin film is supported in a uniformly
tensioned state by being sandwiched from a thickness direction, for example, by a pair of frame
members so as to obtain excellent acoustic conversion efficiency. Is required.
[0005]
JP 2004-023436
[0006]
However, since the above-mentioned conventional sound generator actively utilizes the
resonance of the uniformly tensioned diaphragm, a peak (a portion where the sound pressure is
higher than that of the surroundings) and a dip in the frequency characteristic of the sound
pressure There is a problem that (the part where the sound pressure is lower than the
surrounding area) is likely to occur, and it is difficult to obtain good sound quality.
[0007]
One aspect of the embodiments is made in view of the above, and it is an object of the present
invention to provide an acoustic generator, an acoustic generator and an electronic device
capable of obtaining good frequency characteristics of sound pressure.
[0008]
The sound generator according to one aspect of the embodiment includes an exciter, a flat
diaphragm, and a frame.
The exciter vibrates when an electrical signal is input.
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The vibrator is attached with the exciter and vibrates with the exciter due to the vibration of the
exciter.
The frame is provided on an outer peripheral portion of the diaphragm.
Further, each corner of the inner peripheral surface of the frame includes at least a curved
surface, and at least one of the corners is different in shape from the other corner.
Moreover, the sound generator which concerns on one aspect of embodiment is provided with
the above-mentioned sound generator and the housing | casing which accommodates a sound
generator. In addition, an electronic device according to one aspect of the embodiment includes
the above-described sound generator, an electronic circuit connected to the sound generator, and
a housing that accommodates the electronic circuit and the sound generator, and the sound
generator It has a function to generate sound.
[0009]
According to one aspect of the embodiment, good sound pressure frequency characteristics can
be obtained.
[0010]
FIG. 1A is a schematic plan view showing a schematic configuration of a basic sound generator.
FIG. 1B is a cross-sectional view taken along line A-A 'of FIG. 1A. FIG. 2 is a diagram showing an
example of the frequency characteristic of sound pressure. FIG. 3 is a schematic plan view
showing an example of the configuration of the sound generator according to the embodiment.
FIG. 4 is a schematic schematic plan view (No. 1) showing an example of forming the corner of
the frame. FIG. 5A is a schematic schematic plan view (No. 2) showing an example of forming the
corner of the frame. FIG. 5B is a schematic schematic plan view (No. 3) showing an example of
forming the corner of the frame. FIG. 6 is a schematic schematic plan view (No. 4) showing an
example of forming the corner of the frame. FIG. 7 is a schematic schematic plan view (No. 5)
showing an example of forming the corner of the frame. FIG. 8A is a diagram showing the
configuration of the sound generation device according to the embodiment. FIG. 8B is a view
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showing the configuration of the electronic device according to the embodiment.
[0011]
Hereinafter, embodiments of a sound generator, a sound generator and an electronic device
disclosed in the present application will be described in detail with reference to the attached
drawings. Note that the present invention is not limited by the embodiments described below.
[0012]
First, prior to the description of the sound generator 1 according to the embodiment, a schematic
configuration of a basic sound generator 1 'will be described using FIGS. 1A and 1B. FIG. 1A is a
schematic plan view showing a schematic configuration of the sound generator 1 ′, and FIG. 1B
is a cross-sectional view taken along the line A-A ′ of FIG. 1A.
[0013]
In order to make the description easy to understand, FIGS. 1A and 1B illustrate a threedimensional orthogonal coordinate system including a Z axis in which the vertically upward
direction is a positive direction and the vertically downward direction is a negative direction.
Such an orthogonal coordinate system may also be shown in other drawings used in the
following description.
[0014]
Further, in the following, with respect to the constituent element composed of a plurality of parts,
the sign may be attached to only one of the plural parts, and the addition of the sign may be
omitted for the other parts. In such a case, it is assumed that parts denoted by reference
numerals have the same configuration as the other parts.
[0015]
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Further, in FIG. 1A, illustration of the resin layer 7 (described later) is omitted. Further, in order
to make the description easy to understand, FIG. 1B shows the sound generator 1 ′ in a greatly
exaggerated manner in the thickness direction (Z-axis direction).
[0016]
As shown to FIG. 1A, sound generator 1 'is provided with the frame 2, the diaphragm 3, and the
piezoelectric element 5 as an exciter. As shown in FIG. 1A, the following description exemplifies
the case where one piezoelectric element 5 is provided, but the number of piezoelectric elements
5 is not limited.
[0017]
The frame 2 is constituted by two frame members having a substantially rectangular frame shape
and the same shape, and functions as a support for supporting the diaphragm 3 by sandwiching
the outer peripheral portion (peripheral portion) of the diaphragm 3 . The diaphragm 3 has a
plate-like or film-like shape, and its outer peripheral portion is sandwiched and fixed by two
frame members constituting the frame 2, and tension is uniformly applied within the frame of the
frame 2. It is supported flatly in the state where it is applied.
[0018]
A portion of the diaphragm 3 inside the inner periphery of the frame 2, that is, a portion of the
diaphragm 3 which is not sandwiched by the frame 2 and can freely vibrate is referred to as a
vibrator 3a. That is, the vibrating body 3 a is a portion having a substantially rectangular shape
in the frame of the frame 2.
[0019]
Moreover, the diaphragm 3 can be formed using various materials, such as resin and a metal. For
example, the diaphragm 3 can be made of a resin film of polyethylene, polyimide or the like
having a thickness of 10 to 200 μm.
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[0020]
Further, the thickness, the material, and the like of the two frame members constituting the
frame 2 are not particularly limited, and various materials such as metal and resin can be used.
For example, since it is excellent in mechanical strength and corrosion resistance, a stainless steel
having a thickness of about 100 to 5000 μm can be suitably used as the two frame members
constituting the frame 2.
[0021]
Although FIG. 1A shows a frame 2 in which the shape of the region inside thereof is substantially
rectangular with rounded corners (that is, including curved surfaces), a substantially
parallelogram is shown. It may be a substantially polygonal shape such as a substantially
trapezoidal shape or a substantially regular n-gonal shape. In the present embodiment, as shown
in FIG. 1A, it is assumed to be substantially rectangular. Also, by rounding the corners in this
way, it is possible to obtain the merit of increasing the mechanical strength of the frame 2.
[0022]
In the above description, the frame 2 is constituted by two frame members, and the peripheral
portion of the diaphragm 3 is sandwiched and supported by the two frame members as an
example, but the present invention is limited thereto. It is not a thing. For example, the frame 2
may be formed of a single frame member, and the peripheral portion of the diaphragm 3 may be
adhered and fixed to the frame 2 and supported.
[0023]
The piezoelectric element 5 is provided by being attached to the surface of the vibrating plate 3
(vibrating body 3a) or the like, and is an exciter that excites the vibrating plate 3 (vibrating body
3a) by vibrating upon receiving an applied voltage. .
[0024]
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As shown in FIG. 1B, the piezoelectric element 5 is, for example, a laminated body in which
piezoelectric layers 5a, 5b, 5c, and 5d made of four layers of ceramics and three layers of
internal electrode layers 5e are alternately stacked; The laminate includes surface electrode
layers 5f and 5g formed on the upper and lower surfaces of the laminate, and external electrodes
5h and 5j formed on the exposed side surfaces of the internal electrode layer 5e.
Further, lead terminals 6a and 6b are connected to the external electrodes 5h and 5j.
[0025]
The piezoelectric element 5 has a plate shape, and the main surfaces on the upper surface side
and the lower surface side have a polygonal shape such as a rectangular shape or a square shape.
The piezoelectric layers 5a, 5b, 5c and 5d are polarized as shown by arrows in FIG. 1B. That is,
the direction of polarization with respect to the direction of the electric field applied at a certain
moment is polarized such that one side and the other side in the thickness direction (Z-axis
direction in the drawing) are reversed.
[0026]
Then, when a voltage is applied to the piezoelectric element 5 through the lead terminals 6a and
6b, for example, at a certain moment, the piezoelectric layers 5c and 5d on the side adhered to
the diaphragm 3 (the vibrator 3a) shrinks, The piezoelectric layers 5a and 5b on the upper
surface side of the piezoelectric element 5 deform so as to extend. Therefore, by giving an
alternating current signal to the piezoelectric element 5, the piezoelectric element 5 can be bent
and vibrated, and the bending vibration can be applied to the diaphragm 3 (the vibrating body
3a).
[0027]
Further, the main surface of the piezoelectric element 5 is bonded to the main surface of the
diaphragm 3 (the vibrator 3a) by an adhesive such as an epoxy resin.
[0028]
As materials constituting the piezoelectric layers 5a, 5b, 5c and 5d, lead-free piezoelectric
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materials such as lead zirconate titanate, Bi layer compounds, tungsten bronze structure
compounds, etc. The piezoelectric ceramic used can be used.
[0029]
Moreover, various metal materials can be used as a material of the internal electrode layer 5e.
For example, in the case of containing a metal component composed of silver and palladium, and
a ceramic component forming piezoelectric layers 5a, 5b, 5c, 5d, between piezoelectric layers 5a,
5b, 5c, 5d and internal electrode layer 5e. Since the stress due to the thermal expansion
difference can be reduced, it is possible to obtain the piezoelectric element 5 having no stacking
fault.
[0030]
Also, the lead terminals 6a, 6b can be formed using various metal materials.
For example, when the lead terminals 6a and 6b are formed using a flexible wiring in which a
metal foil such as copper or aluminum is sandwiched by resin films, the height of the
piezoelectric element 5 can be reduced.
[0031]
Further, as shown in FIG. 1B, the acoustic generator 1 ′ further includes a resin layer 7 filled in
a frame of the frame 2 so as to cover the surfaces of the piezoelectric element 5 and the vibrating
body 3a and formed in a layer. .
[0032]
For example, an acrylic resin or an epoxy resin can be used for the resin layer 7.
Then, the resin layer 7 is filled and hardened to be integrated with the vibrating body 3a and the
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piezoelectric element 5, and together with the vibrating body 3a and the piezoelectric element 5,
one composite vibrating body is formed.
[0033]
In addition, since the appropriate damping effect can be induced by completely burying the
piezoelectric element 5 in the resin layer 7, the resonance phenomenon can be suppressed, and
the peak and dip in the frequency characteristic of the sound pressure can be suppressed small.
You can get
[0034]
Further, in FIG. 1B, a bimorph-type laminated piezoelectric element is described as an example of
the piezoelectric element 5. However, the present invention is not limited to this. For example,
the piezoelectric element 5 which is expanded and contracted can be used as the diaphragm 3
(oscillator 3a) It may be a pasted unimorph type.
[0035]
By the way, in FIG. 1B, the diaphragm 3 (the vibrator 3a) flatly supported in a state in which
tension is uniformly applied within the frame 2 and the surface of the diaphragm 3 (the vibrator
3a). The piezoelectric element 5 provided and the resin layer 7 which is integrated with these,
and the surface is flattened and cut at the height of the frame 2 is shown.
[0036]
That is, the composite vibrator configured of the vibrator 3a whose outer periphery is defined by
the substantially rectangular inner periphery of the frame 2, the piezoelectric element 5, and the
resin layer 7 has a so-called symmetry that is shaped as a whole. It can be said that it has a
different shape.
In such a case, a peak, a dip, or a distortion caused by resonance induced by the vibration of the
piezoelectric element 5 causes a sudden change in sound pressure at a specific frequency,
making it difficult to flatten the frequency characteristic of the sound pressure. .
[0037]
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This point will be specifically described with reference to FIG.
FIG. 2 is a diagram showing an example of the frequency characteristic of sound pressure.
As described above, in the case where the composite vibrator constituted by the vibrator 3a, the
piezoelectric element 5 and the resin layer 7 is shaped to have a symmetry as a whole, for
example, the vibrator 3a or the resin layer 7 The Young's modulus of each of the is equalized
overall.
[0038]
However, in such a case, since the peaks are concentrated at a specific frequency and degenerate
due to the resonance of the vibrator 3a, as shown in FIG.
[0039]
As an example, attention is focused on a portion enclosed by a dashed closed curve PD in FIG.
When such a peak P occurs, the sound pressure varies depending on the frequency, which makes
it difficult to obtain good sound quality.
[0040]
In such a case, as shown in FIG. 2, the height of peak P is lowered (see arrow 201 in the figure)
and the peak width is broadened (see arrow 202 in the figure), and peak P or dip (not shown) is
It is effective to take measures to make it smaller.
[0041]
Therefore, in the present embodiment, with respect to the inner peripheral surface of the frame 2
defining the outer periphery of the vibrating body 3a, the shape of at least one corner of the
inner peripheral surface is intentionally made different from the shapes of the other corners. did.
[0042]
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That is, by partially changing the distance from the piezoelectric element 5 to the corner of the
frame 2 to reduce the symmetry of the above-described composite vibrator, the resonance
frequencies are not partially aligned.
Then, as a result, the degeneracy of the resonance mode is solved and dispersed, the height of
the peak P is lowered, and the peak width is broadened.
[0043]
Hereinafter, the sound generator 1 which concerns on embodiment is sequentially demonstrated
using FIG. 3-FIG. 7 concretely.
First, FIG. 3 is a schematic plan view showing an example of the configuration of the sound
generator 1 according to the embodiment.
[0044]
As shown in FIG. 3, in the sound generator 1 according to the embodiment, at least one shape of
the corner of the inner peripheral surface of the frame 2 is made different from the shape of the
other corner. For example, in FIG. 3, only the radius of curvature of the corner portion 2a is r1
among the corner portions 2a to 2d which are all R-shaped by a quarter arc curve, and the radius
of curvature of the other corner portions 2b to 2d Shows an example where is r2.
[0045]
Thus, the distance from the piezoelectric element 5 to the corner 2 a and the piezoelectricity can
be obtained by making the radius of curvature of the at least one corner 2 a (or “curvature”)
different from the other corners 2 b to 2 d. Since the distance from the element 5 to the corner
portions 2b to 2d can be made asymmetric, it is possible to make the resonance frequencies
partially non-uniform.
[0046]
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That is, the peak P of the sound pressure at the resonance point can be varied to flatten the
frequency characteristic of the sound pressure.
Therefore, good sound pressure frequency characteristics can be obtained.
[0047]
Continuing on, FIG. 4 is a schematic schematic plan view (part 1) showing an example of
formation of the corner portions 2 a to 2 d of the frame 2. Although the corner portions 2b and
2c are not shown in FIG. 4, they are assumed to have the same shape as the corner portion 2d as
in the case of FIG.
[0048]
Although FIG. 3 described above shows an example in which each of the corner portions 2a to 2d
forms an R shape with a 1⁄4 arc curve, ie, “full R”, by not making this “full R”, The shape of
at least one corner may be different.
[0049]
For example, as shown in FIG. 4, the corner 2 a may be formed by a θ / 360 arc curve of
curvature radius r 1 and a straight line for a “full R” shape of the curvature radius r 2 as in the
corner 2 d .
In such a case, as shown in FIG. 4, the corner 2a includes more flat surfaces than the corners 2b
to 2d, so the symmetry of the composite vibrator is also reduced, and the resonance frequencies
become partially nonuniform. You can do so.
[0050]
That is, the peak P of the sound pressure at the resonance point can be varied to flatten the
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frequency characteristic of the sound pressure. Therefore, good sound pressure frequency
characteristics can be obtained.
[0051]
By the way, although the point which the frame 2 can comprise by two frame members has
already been described, the shape of at least one corner may be made different by making the
shapes of the two frame members different.
[0052]
FIGS. 5A and 5B are schematic schematic plan views (No. 2) and (No. 3) showing examples of
formation of the corner portions 2a to 2d of the frame 2, respectively.
Although the corners 2b to 2d are not shown in FIGS. 5A and 5B or in FIGS. 6 and 7 to be
described later, at least the shape different from the corners 2a as described above. Shall be
[0053]
For example, as shown in FIG. 5A, assuming that the frame width W of the frame 2 is the same,
the curvature of the corner 2 aa of the frame member on the front side and the corner 2 ab of
the frame member on the back side May be different.
[0054]
Also, for example, as shown in FIG. 5B, after making the frame width W of the front side frame
member different from the frame width W 'of the rear side frame member, the corner 2aa of the
front side frame member and the rear side The corner 2a may be configured to be in contact with
the corner 2ab of the frame member.
[0055]
As described above, the symmetry of the composite vibrator can also be reduced by making the
shapes of the two frame members different from each other, so that the resonance frequencies
can be made partially unequal.
[0056]
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That is, the peak P of the sound pressure at the resonance point can be varied to flatten the
frequency characteristic of the sound pressure.
Therefore, good sound pressure frequency characteristics can be obtained.
[0057]
In addition, when making the shape of two frame members different, it is preferable that a
mutual error is a grade which is contained in the tolerance | permissible_range as tolerance.
[0058]
Next, FIG. 6 is a schematic schematic plan view (No. 4) showing an example of forming the corner
portions 2 a to 2 d of the frame 2.
So far, the case has been described where the corner 2a is at the inner side of the corner 2a 'at
least assumed to be formed by the adjacent inner circumferential plane of the frame 2, as shown
in FIG. The corner 2a may be formed outside the corner 2a ′.
[0059]
That is, as shown in FIG. 6, at least one corner 2 a may be formed to have a curved surface that is
recessed toward the outer peripheral side of the frame 2.
As a result, the symmetry of the composite vibrator can be lowered as well, so that the resonance
frequencies can be partially misaligned.
[0060]
That is, the peak P of the sound pressure at the resonance point can be varied to flatten the
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frequency characteristic of the sound pressure.
Therefore, good sound pressure frequency characteristics can be obtained.
[0061]
In addition, the curved surface may be partially recessed toward the outer peripheral side of the
frame 2 with respect to the curved surface of at least one corner 2a. FIG. 7 is a schematic
schematic plan view (No. 5) showing an example of formation of the corner portions 2 a to 2 d of
the frame 2.
[0062]
That is, as shown in FIG. 7, a curved surface is formed such that the curved surface is partially
recessed toward the outer peripheral side of the frame 2 with respect to the curved surface of at
least one corner 2 a (see the two-dot chain line in the drawing). The corner 2a may be configured
to have a plurality (for example, two).
[0063]
As described above, asymmetry of the composite vibrator can be complicated by providing a
plurality of curved surfaces which are partially recessed toward the outer peripheral side of the
frame 2, so that the resonance frequencies are partially aligned. You can lose it.
[0064]
Although the case where only the corner 2a differs in shape from the other corners 2b to 2d has
been described above with reference to FIGS. 3 to 7, the present invention is not limited to this,
and as a composite vibrator If the symmetry can be reduced, for example, the shapes of the
corner portions 2a to 2d may be different from one another.
[0065]
Next, a sound generating device and an electronic device on which the sound generator 1
according to the embodiment described above is mounted will be described using FIGS. 8A and
8B.
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FIG. 8A is a view showing the configuration of the sound generation device 20 according to the
embodiment, and FIG. 8B is a view showing the configuration of the electronic device 50
according to the embodiment.
In both figures, only the components necessary for the description are shown, and the
description of general components is omitted.
[0066]
The sound generation device 20 is a sound generation device such as a so-called speaker, and as
shown in FIG. 8A, for example, includes a sound generator 1 and a housing 30 for housing the
sound generator 1.
The housing 30 resonates the sound emitted by the sound generator 1 internally, and radiates
the sound to the outside from an opening (not shown) formed in the housing 30. By including
such a housing 30, sound pressure in, for example, a low frequency band can be increased.
[0067]
Also, the sound generator 1 can be mounted on various electronic devices 50. For example, in
FIG. 8B shown next, it is assumed that the electronic device 50 is a portable terminal device such
as a mobile phone or a tablet terminal.
[0068]
As shown in FIG. 8B, the electronic device 50 includes the electronic circuit 60. The electronic
circuit 60 includes, for example, a controller 50a, a transmitting / receiving unit 50b, a key input
unit 50c, and a microphone input unit 50d. The electronic circuit 60 is connected to the sound
generator 1 and has a function of outputting an audio signal to the sound generator 1. The sound
generator 1 generates a sound based on the sound signal input from the electronic circuit 60.
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[0069]
The electronic device 50 further includes a display unit 50 e, an antenna 50 f, and the sound
generator 1. In addition, the electronic device 50 includes a housing 40 that accommodates each
of these devices.
[0070]
Although FIG. 8B shows a state in which all the devices including the controller 50a are housed
in one housing 40, the housing form of each device is not limited. In the present embodiment, at
least the electronic circuit 60 and the sound generator 1 may be accommodated in one housing
40.
[0071]
The controller 50 a is a control unit of the electronic device 50. The transmitting and receiving
unit 50b transmits and receives data via the antenna 50f based on the control of the controller
50a.
[0072]
The key input unit 50c is an input device of the electronic device 50, and receives a key input
operation by the operator. The microphone input unit 50d is also an input device of the
electronic device 50, and receives a voice input operation and the like by the operator.
[0073]
The display unit 50 e is a display output device of the electronic device 50, and outputs display
information based on the control of the controller 50 a.
[0074]
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The sound generator 1 then operates as a sound output device in the electronic device 50.
The sound generator 1 is connected to the controller 50a of the electronic circuit 60, and emits a
sound in response to the application of a voltage controlled by the controller 50a.
[0075]
By the way, although FIG. 8B described the electronic device 50 as a portable terminal device, it
does not ask the type of the electronic device 50, and may be applied to various consumer
devices having a function of emitting sound. . For example, flat-screen TVs and car audio devices
may be used for various products such as vacuum cleaners, washing machines, refrigerators,
microwave ovens, etc. .
[0076]
As described above, the sound generator according to the embodiment includes the exciter
(piezoelectric element), the flat diaphragm, and the frame. The exciter vibrates when an electrical
signal is input. The vibrator is attached with the exciter, and vibrates with the exciter due to the
vibration of the exciter. The frame is provided on the outer peripheral portion of the diaphragm.
Further, each corner of the inner circumferential surface of the frame includes at least a curved
surface, and at least one of the corners differs in shape from the other corner.
[0077]
Therefore, according to the sound generator which concerns on embodiment, the frequency
characteristic of a favorable sound pressure can be obtained.
[0078]
In the embodiment described above, mainly the R-shape formed only by the arc curve in plan
view is described as an example, but at least local bending may be circular approximation, in
other words, For example, it may be a substantially rounded shape including at least a curved
surface.
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[0079]
Further, in the embodiment described above, the description has been made mainly by
exemplifying the case where the piezoelectric element is provided on one main surface of the
diaphragm, but the invention is not limited thereto. It may be provided.
[0080]
Further, in the embodiment described above, the diaphragm is made of a thin film such as a resin
film. However, the present invention is not limited to this. For example, the diaphragm may be
made of a plate-like member.
[0081]
In the above-described embodiment, although the case where the exciter is a piezoelectric
element has been described as an example, the exciter is not limited to a piezoelectric element,
and a function of vibrating by receiving an electric signal is described. What is possessed is good.
[0082]
For example, an electrodynamic exciter, an electrostatic exciter, or an electromagnetic exciter
well known as an exciter for vibrating a speaker may be used.
[0083]
It is to be noted that the electrodynamic exciter is such that a current is supplied to the coil
disposed between the magnetic poles of the permanent magnet to vibrate the coil, and the
electrostatic exciter is formed of two facing metals The bias and the electrical signal are supplied
to the plate to cause the metal plate to vibrate, and the electromagnetic exciter is to cause the
electrical signal to flow to the coil to cause the thin iron plate to vibrate.
[0084]
Further effects and modifications can be easily derived by those skilled in the art.
Thus, the broader aspects of the invention are not limited to the specific details and
representative embodiments represented and described above.
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Accordingly, various modifications may be made without departing from the spirit or scope of
the general inventive concept as defined by the appended claims and their equivalents.
[0085]
1, 1 'Acoustic Generator 2 Frame 2a-2d, 2a', 2aa, 2ab Corner 3 Diaphragm 3a Vibrator 5
Piezoelectric element 5a, 5b, 5c, 5d Piezoelectric layer 5e Internal electrode layer 5f, 5g Surface
electrode Layer 5h, 5j External electrode 6a, 6b Lead terminal 7 Resin layer 20 Sound generator
30, 40 Case 50 Electronic device 50a Controller 50b Transmitter and receiver 50c Key input unit
50d Microphone input unit 50e Display unit 50f Antenna 60 Electronic circuit P Peak W , W
'frame width r1, r2 radius of curvature
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