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DESCRIPTION JP2014143649

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DESCRIPTION JP2014143649
Abstract: PROBLEM TO BE SOLVED: To provide a highly reliable sound generator and an
electronic device using the same. SOLUTION: A flat vibrating body 3 and a first surface 3a which
is one of the main surfaces of the vibrating body 3 are attached, and when an electric signal is
inputted and vibrated, the vibrating body 3 is bent and vibrated. The vibration body 3 has at least
the exciter 1 and a housing to which the vibration body 3 is attached, and the second surface 3 b
which is the other main surface of the vibration body 3 is exposed to the outside, An acoustic
generator characterized in that it is attached to a housing so that the face 3a of the housing faces
the inside of the housing, and an electronic device using the same. [Selected figure] Figure 2
Sound generator and electronic device using the same
[0001]
The present invention relates to a sound generator and an electronic device using the same.
[0002]
Conventionally, there is known a speaker which attaches a diaphragm to a case and vibrates the
diaphragm by a piezoelectric element attached to the diaphragm to generate sound (see, for
example, Patent Document 1).
[0003]
Japanese Patent Application Publication No. 2004-23436
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1
[0004]
The above-described conventional speaker has a problem that since the piezoelectric element is
exposed to the outside, the foreign matter or the water may come in contact with the
piezoelectric element or the electric wiring connected thereto, which may cause a reduction in
sound quality or an operation failure. was there.
[0005]
The present invention has been made in view of the problems in the prior art, and an object
thereof is to provide a highly reliable sound generator and an electronic device using the same.
[0006]
The sound generator of the present invention is attached to a flat vibrating body and a first
surface which is one of the main surfaces of the vibrating body, and bends the vibrating body by
receiving an electric signal and vibrating it. The vibrator has at least an exciter to be vibrated,
and a housing to which the vibrator is attached, and the vibrator has a second surface which is
the other main surface of the vibrator exposed to the outside, It is characterized in that it is
attached to the housing such that the surface of 1 faces the inside of the housing.
[0007]
An electronic device according to the present invention includes at least the sound generator and
an electronic circuit connected to the sound generator, and has a function of generating sound
from the sound generator. is there.
[0008]
According to the sound generator of the present invention, a highly reliable sound generator can
be obtained.
According to the electronic device of the present invention, an electronic device with high
reliability can be obtained.
[0009]
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2
It is a perspective view which shows typically the sound generator of the 1st example of
embodiment of this invention.
It is an A-A 'line sectional view of FIG.
It is a top view which shows the state which saw through the wall member 21a in the sound
generator of FIG.
It is a perspective view which shows typically the sound generator of the 2nd example of
embodiment of this invention.
FIG. 5 is a cross-sectional view taken along the line B-B ′ of FIG. 4;
It is a top view which shows the state which saw through the wall member 21a in the sound
generator of FIG.
It is sectional drawing which shows typically the electronic device of the 3rd example of
embodiment of this invention.
[0010]
Hereinafter, a sound generator which is an example of an embodiment of the present invention
and an electronic device using the same will be described in detail with reference to the attached
drawings.
[0011]
First Example of Embodiment FIG. 1 is a plan view schematically showing an acoustic generator
according to a first example of the embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line A-A 'in FIG. FIG. 3 is a plan view showing a
state in which the wall member 21a in the sound generator of FIG. 1 is seen through. In FIGS. 1
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3
to 3, the directions are represented by orthogonal coordinates formed by x-axis, y-axis, and z-axis
orthogonal to each other. The sound generator of this example has an exciter 1, a vibrating body
3, frames 5a and 5b, an enclosure 21, a first space 22, and a duct 23, as shown in FIGS. ing.
[0012]
The vibrating body 3 has a flat shape, and more specifically, has a film-like (film-like) shape. The
vibrating body 3 has a shape elongated in the x-axis direction, and has a rectangular planar
shape in which the x-axis direction is the length direction and the y-axis direction is the width
direction. Is the thickness direction. The vibrating body 3 can be formed using various materials.
For example, the vibrating body 3 is formed of a resin such as polyethylene, polyimide,
polypropylene, polystyrene, etc., or paper made of pulp, fibers, etc. be able to. The thickness of
the vibrator 3 is, for example, 10 to 200 μm. The vibrating body 3 may have a flat shape, for
example, may have a plate shape.
[0013]
Each of the frames 5a and 5b has a rectangular frame shape, and has a thickness of, for example,
about 0.1 mm to 10 mm. The frames 5a and 5b have a shape elongated in the x-axis direction,
the x-axis direction being the length direction, the y-axis direction being the width direction, and
the z-axis direction being the thickness direction. The material and shape of the frames 5a and 5b
are not particularly limited, but it is desirable that the frames 5a and 5b be less deformable than
the vibrator 3. For example, the frames 5a and 5b can be formed using a resin such as a hard
resin, a plastic, an engineering plastic, a ceramic, or a metal such as stainless steel.
[0014]
And, in a state where tension is applied, the whole of the rectangular peripheral part is
sandwiched between the frames 5a and 5b and fixed by the adhesive, and the vibrator 3 is
vibratably supported by the frames 5a and 5b. There is. When the frame 5b is not provided, for
example, the vibrator 3 may be adhered to the surface of the frame 5a in the + z direction.
[0015]
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The exciter 1 is a piezoelectric element having a rectangular parallelepiped shape in which the xaxis direction is the length direction, the y-axis direction is the width direction, and the z-axis
direction is the thickness direction. That is, the exciter 1 has a long shape in the x-axis direction.
In the exciter 1, the entire surface on the + z direction side is joined to the central portion of the
first surface 3 a of the vibrating body 3 (the main surface on the −z direction side). Although not
shown in detail, the exciter 1 is a laminate formed by alternately laminating piezoelectric layers
made of piezoelectric ceramic and internal electrode layers, and upper and lower surfaces (both
end surfaces in the z-axis direction) of the laminate. And a pair of terminal electrodes respectively
provided on both end faces in the longitudinal direction (x-axis direction) of the laminate. The
surface electrodes and the internal electrode layers are alternately drawn out to both end
surfaces in the longitudinal direction (x-axis direction) of the laminate, and are connected to the
terminal electrodes, respectively. Then, an electrical signal is applied to the pair of terminal
electrodes through a wire (not shown).
[0016]
The exciter 1 is a bimorph piezoelectric element, and when an electrical signal is input, expansion
and contraction are reversed between one side and the other side in the thickness direction (zaxis direction) at any moment. It has been Therefore, the exciter 1 bends and vibrates in the zaxis direction when an electric signal is input, and vibrates itself to vibrate the vibrating body 3
in the z-axis direction. Then, the vibrating body 3 vibrates to generate a sound. As described
above, the sound generator of this example causes the vibrating body 3 to bend and vibrate, and
actively generates a sound by using a large number of resonance modes generated in the
vibration of the vibrating body 3.
[0017]
As the exciter 1, for example, a monomorph type vibration element may be used, in which a
piezoelectric element that receives an electric signal and vibrates in a stretching manner is
bonded to a metal plate. Further, the main surface on the vibrating body 3 side of the exciter 1
and the vibrating body 3 are adhered by a known adhesive such as epoxy resin, silicon resin,
polyester resin, double-sided tape or the like.
[0018]
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The piezoelectric layer of the exciter 1 is a conventionally used piezoelectric material such as
lead-free piezoelectric material such as lead zirconate (PZ), lead zirconate titanate (PZT), Bi layer
compound, tungsten bronze structure compound, etc. Ceramics can be used. The thickness of one
layer of the piezoelectric layer is preferably about 10 to 100 μm from the viewpoint of low
voltage driving. Further, in order to induce a large bending deflection vibration and to increase
the sound pressure, it is desirable that the piezoelectric d31 constant of the piezoelectric layer is
180 pm / V or more.
[0019]
Various known metal materials can be used as the internal electrode layers of the exciter 1. For
example, when the internal electrode layer contains a metal component composed of silver and
palladium and a material component constituting the piezoelectric layer, the stress due to the
thermal expansion difference between the piezoelectric layer and the internal electrode layer can
be reduced. And other materials may be used. The surface electrode layer and the terminal
electrode of the exciter 1 can be formed using various known metal materials. For example, when
a material containing a metal component and a glass component made of silver is used, adhesion
between the piezoelectric layer or the internal electrode layer and the surface electrode layer or
the terminal electrode can be enhanced, but other materials may be used. You may form using it.
[0020]
The enclosure 21 has a box-like shape whose outer shape is a rectangular solid, and is configured
by joining a plurality of wall members 21 a to 21 g each having a rectangular plate shape. In
detail, the wall member 21a disposed on the + z direction side and the wall member 21b
disposed on the −z direction side are opposed to each other at an interval in the z axis direction,
and the peripheral edge of the wall members 21a and 21b The four sides of are connected by
wall members 21c to 21f. That is, the end portions in the + y direction of the wall members 21a
and 21b are entirely connected by the wall member 21f, and the end portions in the -y direction
of the wall members 21a and 21b are entirely connected by the wall member 21e. The ends of
the wall members 21a and 21b in the -x direction are connected to each other by the wall
member 21d.
[0021]
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The end portions of the wall members 21a and 21b in the + x direction are connected by the wall
member 21c except for the end portions in the + y direction. That is, although the end of the wall
member 21c in the -y direction is connected to the wall member 21e, a gap (opening 21h) is
formed between the end of the wall member 21c in the + y direction and the wall member 21f.
There is. That is, the enclosure 21 has an opening 21 h at the end in the + y direction of the side
surface in the + x direction.
[0022]
Further, a wall member 21g connecting the wall members 21a and 21b is disposed between the
wall members 21a and 21b so as to extend in the x-axis direction. The end of the wall member
21g in the + x direction is connected to the end of the wall member 21c in the + y direction, but a
gap 21m is formed between the end of the wall member 21g in the -x direction and the wall
member 21d. It is formed. That is, the space enclosed by the wall members 21a to 21f of the
enclosure 21 is divided by the wall member 21g into a space on the + y direction side and a
space on the −y direction side, but two spaces are connected by the gap 21m ing. The space on
the + y direction side is smaller than the space on the −y direction side, and has a shape
elongated in the x-axis direction.
[0023]
Further, a rectangular opening 21k is formed on the side of the wall member 21a to which the
wall member 21g is joined in the -y direction, and a frame 5b is formed on the periphery of the
opening 21k of the main surface on the -z direction side of the wall member 21a. The peripheral
edge of the main surface on the + z direction side of the vibrating body 3 is joined via That is, the
opening 21k is closed by the vibrating body 3, and the main surface of the vibrating body 3 in
the + z direction is exposed to the external space through the opening 21k.
[0024]
As described above, the enclosure 21 and the frames 5a and 5b constitute a housing, and the
vibrator 3 is attached to the housing. Then, a first space 22 surrounded by the casing formed of
the enclosure 21 and the frames 5a and 5b and the vibrator 3 is formed. In detail, the first space
22 is formed by being surrounded by the vibrating body 3, the frames 5a and 5b, and the wall
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members 21a, 21b, 21c, 21d, 21e and 21g of the enclosure 21. In the vibration body 3, the first
surface 3 a (main surface on the −z direction side) to which the exciter 1 is attached faces the
inside of the housing (that is, faces the first space 22), and It is attached to a case so that field 3b
(principal surface by the side of + z direction) of may be exposed outside.
[0025]
Further, a duct 23 is formed by a space surrounded by the wall members 21a, 21b, 21d, 21f, 21g
of the enclosure 21. One end of the duct 23 is connected to the first space 22 via the gap 21m,
and the other end of the duct 23 is connected to the external space via the opening 21h. That is,
the duct 23 connects the first space 22 and the external space.
[0026]
In addition, the enclosure 21 should just comprise at least 1st space, and the shape of the
enclosure 21 is not specifically limited. For example, various shapes, such as spherical shape and
pyramid shape, may be used. Further, the material of the enclosure 21 is also not particularly
limited, and can be formed using, for example, known materials such as wood, synthetic resin,
and metal.
[0027]
Further, in the present example, an example in which the enclosure is configured by the
enclosure 21 and the frames 5a and 5b is shown, but the frames 5a and 5b are not essential, and
the enclosure may be configured by only the enclosure 21. Absent. In this case, the vibrating
body 3 may be directly bonded to the peripheral edge of the opening 21k of the wall member
21a.
[0028]
The sound generator of this example is attached to the flat vibrating body 3 and the first surface
3 a which is one of the main surfaces of the vibrating body 3, and the vibrating body 3 is
vibrated by receiving an electric signal and vibrating. The vibrator 3 has at least an exciter 1 for
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bending and vibrating, and a housing to which the vibrator 3 is attached, and the vibrator 3 has
the second surface 3 b which is the other main surface of the vibrator 3 exposed to the outside.
And is attached to the housing such that the first surface 3a faces the inside of the housing. As a
result, the exciter 1 and a wire (not shown) connected to the exciter 1 to supply an electrical
signal to the exciter 1 can be located inside the housing. As a result, it is possible to reduce the
deterioration of sound quality and the occurrence of malfunction due to the contact of foreign
matter, water, etc. with the exciter 1 or the wiring, so it is possible to obtain an acoustic
generator with excellent reliability.
[0029]
Further, in the sound generator of this example, a first space 22 surrounded by a housing
constituted by the enclosure 21 and the frames 5a and 5b and the vibrating body 3 is formed,
and the vibrating body 3 serves as the first space 22. It constitutes a part of the wall to be
formed. As a result, it is possible to realize an acoustic generator that can efficiently radiate the
sound generated from the vibrator 3 to the outside and has excellent reliability with a simple
configuration.
[0030]
Further, in the sound generator of this example, the housing (the enclosure 21 and the frames 5a
and 5b) and the vibrating body 3 are not permeable to water, and water does not infiltrate the
housing and the vibrating body 3 By connecting, it is possible to obtain a more reliable sound
generator.
[0031]
The sound generator of this example can be manufactured, for example, as follows.
First, a binder, a dispersant, a plasticizer and a solvent are added to the powder of the
piezoelectric material and the mixture is stirred to prepare a slurry. As a piezoelectric material,
any of lead-based and non-lead-based can be used. Next, the obtained slurry is formed into a
sheet to prepare a green sheet. A conductor paste is printed on the green sheet to form a
conductor pattern to be an internal electrode, and the green sheet on which the conductor
pattern is formed is laminated to produce a laminate molded body.
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9
[0032]
Next, the laminate is degreased and fired, and cut into a predetermined size to obtain a laminate.
As needed, the outer peripheral part of a laminated body is processed. Next, a conductor paste is
printed on the main surface in the lamination direction of the laminate to form a conductor
pattern to be a surface electrode layer, and the conductor paste is printed on both sides in the
longitudinal direction (x-axis direction) of the laminate. A conductor pattern to be a pair of
terminal electrodes is formed. And the structure used as the exciter 1 can be obtained by baking
an electrode at predetermined | prescribed temperature. Thereafter, in order to impart
piezoelectricity to the exciter 1, a direct current voltage is applied through the surface electrode
layer or the pair of terminal electrodes to polarize the piezoelectric layer of the exciter 1. Thus,
the exciter 1 can be obtained.
[0033]
Next, the peripheral portion of the vibrating body 3 in a tensioned state is sandwiched between
the frames 5a and 5b and bonded with an adhesive, and the exciter 1 is bonded to the vibrating
body 3 with an adhesive. Then, after the frame 5b is bonded to the peripheral portion of the
opening 21k of the wall member 21a with an adhesive, the wall members 21a to 21g are bonded
with an adhesive to form the enclosure 21. Thus, the sound generator of this example can be
obtained.
[0034]
Second Example of Embodiment FIG. 4 is a perspective view schematically showing an acoustic
generator according to a second example of the embodiment of the present invention. 5 is a
cross-sectional view taken along the line B-B 'of FIG. 6 is a plan view showing a state in which the
wall member 21a in the sound generator of FIG. 4 is seen through. In FIGS. 4 to 6, the directions
are represented by orthogonal coordinates composed of x-axis, y-axis, and z-axis orthogonal to
each other. Moreover, in this example, only differences from the sound generator of the first
example of the above-described embodiment will be described, and the same components will be
denoted by the same reference numerals and redundant descriptions will be omitted.
[0035]
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The sound generator of this example does not have the opening 21h, the duct 23, and the wall
member 21g as shown in FIGS. 4 to 6, and the end of the wall member 21c in the + y direction is
joined to the wall member 21f. ing. That is, a first space 22 b, which is a single closed space, is
formed by the casing including the enclosure 21 and the frames 5 a and 5 b and the vibrating
body 3. And this 1st space 22b is made into the space which has airtightness.
[0036]
According to the sound generator of the present example, since the first space 22 b is a closed
space, it is possible to obtain a sound generator with further excellent reliability. In addition,
since the first space 22b is a space having air tightness, it is possible to obtain a sound generator
with higher reliability. Such a sound generator can be used, for example, in water. Note that the
first space 22 b may be a space that does not have air tightness.
[0037]
Further, as shown in FIG. 5, the sound generator of this example further includes a resin layer 20.
The resin layer 20 is filled all over the inside of the frame 5 a so as to embed the exciter 1. By
using such a resin layer 20, the reliability can be enhanced and the sound quality can be
improved. The resin layer 20 can be formed using various known materials. For example, resins
such as acrylic resins and silicone resins, or rubber can be used. For example, those having a
Young's modulus in the range of 1 MPa to 1 GPa are desirable. Moreover, as for the thickness of
the resin layer 20, it is desirable that it is a thickness which is a grade which covers the exciter 1
completely from the point of suppressing a spurious.
[0038]
Third Example of Embodiment FIG. 7 is a cross-sectional view schematically showing an
electronic device of a third example of the embodiment of the present invention. In this example,
only differences from the sound generator of the second example of the above-described
embodiment will be described, and the same components will be denoted by the same reference
numerals and redundant description will be omitted.
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[0039]
As shown in FIG. 7, the electronic device of the present example includes the sound generator of
the second example of the embodiment shown in FIGS. 4 to 6 and an electronic circuit 60. The
electronic circuit 60 is disposed in a first space 22 b surrounded by a housing including the
enclosure 21 and the frames 5 a and 5 b and the vibrator 3. Further, the electronic circuit 60 is
connected to the sound generator (excitation device 1 of the sound generator) by a wire not
shown, and has a function of outputting an audio signal to the sound generator.
[0040]
As described above, the electronic device of the present example at least includes the sound
generator and the electronic circuit 60 connected to the sound generator, and has a function of
generating sound from the sound generator. Since the electronic device of this example generates
sound using an acoustic generator as in the second example of the above-described embodiment,
highly reliable electronic devices can be obtained. Further, in the electronic device of this
example, since the electronic circuit 60 is accommodated in the first space 22 which is a closed
space, it is possible to obtain an electronic device with higher reliability. Further, in the electronic
device of this example, since the electronic circuit 60 is accommodated in the first space 22
which is a space having air tightness, it is possible to obtain a more reliable electronic device. In
addition, for example, an electronic device that can be used even in water can be obtained.
[0041]
In the electronic device of this embodiment, the electronic circuit 60 is disposed in the first space
22b surrounded by the casing including the enclosure 21 and the frames 5a and 5b and the
vibrator 3. The invention is not limited to this, and the electronic circuit 60 may be disposed
outside the first space 22 b. For example, the electronic circuit 60 may be disposed outside the
first space 22b, and the sound generator and the electronic circuit 60 may be connected by a
cable.
[0042]
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Also, the electronic device may have at least the sound generator and the electronic circuit 60,
but may have other components. The electronic circuit 60 may also have other functions in
addition to the function of outputting an audio signal to the sound generator. The electronic
device of this example may be, for example, various electronic devices having a function of
generating sound, such as a mobile phone, a tablet terminal, a television, an audio device, a
vacuum cleaner, a washing machine, a refrigerator, and a microwave. The components other than
the sound generator in the electronic device may be disposed outside the first space 22b.
[0043]
(Modification) The present invention is not limited to the examples of the embodiments described
above, and various modifications and improvements are possible without departing from the
scope of the present invention.
[0044]
For example, in the example of the embodiment described above, although an example in which
one exciter 1 is attached to the first surface 3 a of the vibrating body 3 is shown for ease of
illustration, the invention is limited thereto. It is possible to attach a larger number of exciters 1
instead.
[0045]
Moreover, although the example which used the piezoelectric element as the exciter 1 was shown
in the example of embodiment mentioned above, it is not limited to this.
The exciter 1 only needs to have a function of converting an electrical signal into mechanical
vibration, and another one having a function of converting an electrical signal into mechanical
vibration may be used as the exciter 1.
For example, an electrodynamic exciter, an electrostatic exciter, or an electromagnetic exciter
well known as an exciter for vibrating a speaker may be used as the exciter 1. 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.
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[0046]
1: Exciter 3: Vibrator 22, 22b: First space 60: Electronic circuit
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