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DESCRIPTION JPWO2013099511

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DESCRIPTION JPWO2013099511
PROBLEM TO BE SOLVED: To provide a vibration device capable of generating sound with high
sound pressure in a wide frequency range, and a sound generator, a speaker system and an
electronic device using the same. SOLUTION: A first frame member 3, a first vibrating body 51
provided inside the first frame member 3, and a first vibrating body 51 spaced from the first
frame member 3 are provided. To the second vibrating body 52 and the second vibrating body
52 provided on the inner side of the second frame member 5 at an interval from the attached
second frame member 5 and the first vibrating body 51 A vibratory apparatus characterized by
at least having an attached exciter 1. [Selected figure] Figure 1
Vibration device, sound generator, speaker system, electronic equipment
[0001]
The present invention relates to a vibration device, a sound generator, a speaker system, and an
electronic device.
[0002]
Conventionally, a speaker in which a piezoelectric element is attached to a diaphragm is known
(see, for example, Patent Document 1).
[0003]
Unexamined-Japanese-Patent No. 2004-23436
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1
[0004]
However, the conventional speaker described above has a problem that it is difficult to increase
the sound pressure particularly in a low frequency region, and it is difficult to generate a sound
having a high sound pressure in a wide frequency region.
[0005]
The present invention has been made in view of the problems in the prior art as described above,
and its object is to provide a vibration device capable of generating sound with high sound
pressure in a wide frequency range, and a vibration device using the same. An object of the
present invention is to provide an audio generator, a speaker system, and an electronic device.
[0006]
The vibrating device according to the present invention comprises a first frame member, a first
vibrating body provided inside the first frame member, and the first vibrating body at an interval
from the first frame member. A second frame member attached to the second vibration member,
a second vibration member provided inside the second frame member at a distance from the first
vibration member, and a second vibration member attached to the second vibration member And
at least one exciter.
[0007]
The sound generator of the present invention at least includes at least one speaker and a support
on which the speaker is attached, and the speaker is configured using the vibration device. is
there.
[0008]
The speaker system of the present invention comprises at least one bass speaker, at least one
treble speaker, and a support for supporting the bass speaker and the treble speaker, the bass
speaker and the bass speaker At least one of the high-pitched speakers is characterized by using
the vibration device.
[0009]
The electronic device of the present invention at least includes at least one speaker, a support to
which the speaker is attached, and an electronic circuit connected to the speaker, and the
speaker is configured using the vibration device. And has a function of generating sound from
the speaker.
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[0010]
The vibration device, the sound generation device, the speaker system, and the electronic device
of the present invention can generate sound with high sound pressure in a wide frequency range.
[0011]
It is a top view which shows typically the vibration apparatus of the 1st example of embodiment
of this invention.
It is the A-A 'line sectional view in FIG.
It is a perspective view which shows the sound generation apparatus of the 2nd example of
embodiment of this invention.
It is a perspective view showing the speaker system of the 3rd example of an embodiment of the
invention.
It is a figure which shows the structure of the electronic device of the 4th example of
embodiment of this invention.
It is a graph which shows the frequency characteristic of the sound pressure of the sound which
the vibration apparatus of the 1st example of embodiment of this invention generate | occur |
produces.
It is a graph which shows the frequency characteristic of the sound pressure of the sound which
the vibration apparatus of a comparative example generates.
[0012]
Hereinafter, a vibration device, a sound generation device, a speaker system, and an electronic
device according to embodiments of the present invention will be described in detail with
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reference to the attached drawings.
[0013]
First Example of Embodiment FIG. 1 is a plan view schematically showing a vibration device of 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.
In order to facilitate understanding of the structure, illustration of the resin layer 20 is omitted in
FIG. 1, and in FIG. 2, the resin layer 20 is shown enlarged in the thickness direction of the
vibration device (z-axis direction in the figure). .
[0014]
As shown in FIGS. 1 and 2, the vibration device according to the present embodiment includes a
plurality of exciters 1, a first vibration body 51, a second vibration body 52, a first frame member
3, and a second frame member 3. The frame member 5, the resin layer 20, the conductors 22a,
22b and 22c, and the load member 41 are provided.
[0015]
The first frame member 3 has a rectangular frame shape.
The material and thickness of the first frame member 3 are not particularly limited, but it is
desirable that the first frame member 3 is less deformable than the first vibrator 51.
For example, the first frame member 3 can be formed using hard resin, plastic, engineering
plastic, metal, ceramics or the like.
For example, a stainless steel having a thickness of 100 to 1000 μm can be suitably used.
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Further, the shape of the first frame member 3 is not limited to the rectangular shape, and may
be, for example, a circle or a rhombus.
[0016]
As the first vibrating body 51, for example, one having a flat shape such as a film shape or a
plate shape can be suitably used. The first vibrating body 51 in the present example is in the
form of a film, and the peripheral edge portion of the rectangular shape is attached to the first
frame member 3 with an adhesive in a state where tension is applied in the surface direction. It is
attached to the frame member 3 of 1 so that vibration is possible. That is, the first vibrating body
51 is provided on the entire inner side of the first frame member 3.
[0017]
It is desirable that the first vibrating body 51 is easily deformable and strong. For example, a
resin material such as low density polyethylene or soft polyvinyl chloride or a rubber material
such as urethane rubber, silicone rubber, or acrylic rubber is used. Can be formed. In particular,
porous rubber (foamed rubber) formed using a rubber material such as urethane rubber, silicone
rubber, polyethylene rubber and the like can be suitably used. Further, in particular, urethane
foam can be suitably used. The thickness of the first vibrating body 51 is set to, for example,
about 0.1 mm to 1 mm.
[0018]
The second frame member 5 is attached to the central portion of the first vibrating body 51 at a
distance from the first frame member 3. The second frame member 5 has a rectangular frame
shape, and has an outer dimension smaller than the inner dimension of the first frame member 3.
Moreover, the 2nd frame member 5 is comprised by two frame members 5a and 5b which have
the same shape. The frame members 5a and 5b each have a rectangular frame shape. The outer
peripheral portion of the second vibrating body 52 is sandwiched between the frame members
5a and 5b, and the second vibrating body 52 is fixed in a state in which tension is applied in the
surface direction. The frame members 5a and 5b can be made of, for example, stainless steel
having a thickness of 100 to 1000 μm. The material of the frame members 5a and 5b is not
limited to stainless steel and may be any material that is less likely to be deformed than the
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second vibrator 52 and the resin layer 20. For example, hard resin, plastic, engineering plastic,
metal, ceramics The material, thickness, etc. are not particularly limited. Furthermore, the shape
of the frame members 5a and 5b is not limited to the rectangular shape, and may be circular or
rhombic.
[0019]
As the second vibrating body 52, for example, one having a flat shape such as a film shape or a
plate shape can be suitably used. The second vibrating body 52 in the present example is in the
form of a film, and is provided on the entire inner side of the second frame member 5 at an
interval from the first vibrating body 51. Further, the second vibrating body 52 is entirely fixed
by clamping the rectangular peripheral portion between the frame members 5a and 5b in a state
where tension is applied in the surface direction, and the vibration is caused by the frame
members 5a and 5b. It is supported possible. The thickness of the second vibrating body 52 is,
for example, 10 to 200 μm. The second vibrating body 52 can be made of, for example, a resin
such as polyethylene, polyimide, polypropylene or polystyrene, or a paper made of pulp, fibers or
the like. By using these materials, peak dip in vibration characteristics can be suppressed.
[0020]
The upper and lower main surfaces of the exciter 1 have a rectangular plate shape, and the one
main surface is attached to and attached to the one main surface of the second vibrating body
52. In detail, two exciters 1 are spaced apart from each other in the width direction (y-axis
direction in the drawing) at the center of the rectangular second vibrating body 52 in the
longitudinal direction (x-axis direction in the drawing). It is attached. The exciter 1 is a
piezoelectric element, and when an electrical signal is input, the exciter 1 vibrates to vibrate the
second vibrator 52.
[0021]
Each exciter 1 is a bimorph piezoelectric element, and when an electric signal is input, expansion
and contraction are performed on one side and the other side in the thickness direction (z-axis
direction in the figure) at any moment. The reverse is being done. That is, when one side in the
thickness direction extends, the other side is contracted. Therefore, each exciter 1 bends and
vibrates when an electric signal is input.
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[0022]
The exciter 1 is a laminate formed by alternately laminating four piezoelectric layers 7 and three
internal electrode layers 9 made of ceramics, and upper and lower surfaces of this laminate (both
end surfaces in the z-axis direction in the figure And the external electrodes (not shown)
respectively provided on both end surfaces (both side surfaces) in the longitudinal direction (xaxis direction in the drawing) of the laminate. .
[0023]
Internal electrode layers 9 are alternately drawn out on both end surfaces in the longitudinal
direction (x-axis direction in the drawing) of the laminate, and are connected to external
electrodes (not shown), respectively.
One external electrode (not shown) is connected to surface electrode layers 15a and 15b and one
internal electrode layer 9 in the center, and the other external electrode (not shown) is an
internal of upper and lower two layers It is connected to the electrode layer 9. The upper and
lower end portions of the other external electrode (not shown) are extended to the upper and
lower surfaces of the laminate to form extensions 19a, and these extensions 19a are surfaces
provided on the surface of the laminate It is disposed at a predetermined distance from the
surface electrode layers 15a and 15b so as not to contact the electrode layers 15a and 15b.
[0024]
In the two exciters 1, on the surface opposite to the second vibrating body 52, the extension
portions 19a are connected by the conducting wire 22a, and the surface electrode layers 15b are
connected by the conducting wire 22a. In addition, one end of the conducting wire 22b is
connected to the extension portion 19a, and one end of the conducting wire 22c is connected to
the front electrode layer 15b of one exciter 1. And the conducting wire 22b and the other end of
the conducting wire 22c are drawn out. Thus, the two exciters 1 are connected in parallel, and
the same voltage is applied via the conductors 22b and 22c.
[0025]
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The piezoelectric layer 7 is polarized in the thickness direction (z-axis direction in the drawing).
As the piezoelectric layer 7, conventionally used piezoelectric ceramics such as lead-free
piezoelectric materials such as lead zirconate (PZ), lead zirconate titanate (PZT), Bi layer
compounds, tungsten bronze structure compounds and the like are used. be able to. The
thickness of one layer of the piezoelectric layer 7 is preferably 10 to 100 μm from the viewpoint
of low voltage driving. It is desirable that the piezoelectric d31 constant of the piezoelectric layer
7 be 180 pm / V or more in order to induce a large bending deflection vibration and to increase
the sound pressure.
[0026]
The internal electrode layer 9 preferably contains, for example, a metal component composed of
silver and palladium and a material component constituting the piezoelectric layer 7. By
containing the ceramic component which comprises the piezoelectric material layer 7 in the
internal electrode layer 9, the stress by the thermal expansion difference of the piezoelectric
material layer 7 and the internal electrode layer 9 can be reduced, and the exciter 1 which does
not have a lamination defect You can get The conductive material contained in the internal
electrode layer 9 is not limited to silver or palladium. The ceramic component contained in the
internal electrode 9 is not limited to the material constituting the piezoelectric layer 7 either, and
may be another ceramic component. It does not need to contain the ceramic component.
[0027]
It is desirable that the surface electrode layers 15a and 15b and the external electrodes (not
shown) contain a glass component in the metal component made of silver. By containing the
glass component, strong adhesion can be obtained between the piezoelectric layer 7 or the
internal electrode layer 9 and the surface electrode layers 15a, 15b or the external electrodes
(not shown).
[0028]
The exciter 1 and the second vibrating body 52 are bonded by an adhesive layer 21. In order to
facilitate transmission of the vibration of the exciter 1 to the second vibrating body 52, the
thickness of the adhesive layer 21 is desirably 20 μm or less, and more desirably 10 μm or less.
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As an adhesive for forming the adhesive layer 21, an adhesive made of a known resin such as an
epoxy resin, a silicon resin, or a polyester resin can be used.
[0029]
The resin layer 20 is filled all over the inside of the frame member 5 a so as to embed the exciter
1. The conducting wire 22 a and a part of the conducting wire 22 b and the conducting wire 22 c
are also embedded in the resin layer 20. The resin layer 20 may be made of, for example, a resin
such as acrylic resin or silicone resin, or rubber, and preferably has a Young's modulus in the
range of 1 MPa to 1 GPa, and particularly preferably 1 MPa to 850 MPa. . 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. The resin layer 20 also
vibrates with the second vibrating body 52.
[0030]
The load member 41 is in the form of a sheet having a rectangular outer shape, and is attached
to the central portion of the second vibrating body 52 via the resin layer 20. That is, it is
attached to the central portion in the longitudinal direction (x-axis direction in the drawing) of
the second vibrating body 52 and to the central portion in the width direction (y-axis direction in
the drawing) of the second vibrating body 52 . The load member 41 is desirably soft and easily
deformable, and can be formed using a rubber material such as urethane rubber, and in
particular, a porous rubber material such as urethane foam can be suitably used. The outer shape
of the load member 41 can be appropriately set to a square shape, a rectangular shape, a circular
shape, an oval shape, a band shape, or the like, in accordance with the region where the vibration
is to be suppressed. The thickness of the load member 41 can be appropriately set according to
the density of the material constituting the load member 41, and is thick when the density is low
and thin when the density is high. The length and width dimensions of the load member 41 are
set to, for example, about 10% to 70% of the length and width dimensions of the second vibrator
52, and the thickness of the load member 41 is, for example, the second vibrator It is set to about
0.5 times to 3 times the thickness of 52.
[0031]
As described above, in the vibration device of this example, the first frame member 3, the first
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vibration body 51 provided inside the first frame member 3, and the first frame member 3 are
spaced from each other. A second frame member 5 attached to the first vibrating body 51, and a
second vibrating body 52 provided on the inner side of the second frame member 5 with an
interval from the first vibrating body 51; , And the exciter 1 attached to the second vibrating
body 52. As a result, by inputting an electric signal to the exciter 1, the second vibrating body 52
can be vibrated, and the first vibrating body 52 is connected to the second vibrating body 52 via
the second frame member 5. Can also be vibrated. Therefore, the sound of the high frequency
region can be generated strongly by the vibration of the second vibrating body 52, and the sound
of the low frequency region can also be generated strongly by the vibration of the first vibrating
body 51. As a result, it is possible to obtain a vibrating device capable of generating sound with
high sound pressure in a wide frequency range.
[0032]
Moreover, since the first vibrating body 51 is provided on the entire inside of the first frame
member 3, the vibration device of this example can enhance the effect of increasing the sound
pressure at low frequencies. In addition, since the second vibrating body 52 is provided on the
entire inner side of the second frame member 5, the vibration device of this example efficiently
transmits the vibration of the exciter 1 to the first vibrating body. And the first vibrating body
can be vibrated strongly and efficiently. Further, in the vibration device of the present example,
since the closed space is formed by the first vibration body 51, the second frame member 5, and
the second vibration body 52, the vibration of the exciter 1 is made more efficient. It can be
transmitted to the first vibrating body 51 well, and the first vibrating body 51 can be vibrated
more strongly. Further, in the vibration device of this example, since the second frame member 5
is attached to the central portion of the first vibration body 51, the vibration can be efficiently
transmitted to the first vibration body 51. The vibrating body 51 can be strongly vibrated, and
the vibrating state of the first vibrating body 51 can be adjusted.
[0033]
Further, in the vibration device of this example, the second frame member 5 is formed of a
material that is less likely to be deformed than the first vibration body 51 and the second
vibration body 52. Thereby, since the vibration of the first vibrating body 51 and the vibration of
the second vibrating body 52 can be separated, the sound in the low frequency region and the
sound in the high frequency region can be generated strongly, respectively. It is possible to
obtain a vibrating device capable of generating sound with high sound pressure in a wide
frequency range.
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[0034]
Furthermore, in the vibration device of this example, since the second frame member 5 is heavier
than the first vibration body 51 and the second vibration body 52, the first vibration body 51
and the second Since the vibration body 52 can be prevented from vibrating integrally, the
vibration of the first vibration body 51 and the vibration of the second vibration body 52 can be
firmly separated.
[0035]
Furthermore, in the vibration device of this example, the first vibration body 51 is formed of a
material that is more easily deformed than the second vibration body 52.
As a result, it is possible to obtain a vibrating device capable of generating sound in the low
frequency range more strongly.
[0036]
Furthermore, in the vibration device of this example, the first vibration body 51 is formed of
porous rubber. Thus, both the function of strongly generating the sound in the low frequency
region and the function of reducing the anti-phase component of the sound in the high frequency
region can be obtained by the first vibrating body 51.
[0037]
Furthermore, in the vibration device of this example, since the load member 41 is attached to a
part of the second vibrator 52 via the resin layer 20, the second vibration of the portion to which
the load member 41 is attached is provided. Because the amplitude of the body 52 can be
reduced, abrupt changes in amplitude at particular frequencies can be reduced. Thereby, in the
frequency characteristic of the sound generated by the vibration of the second vibrating body 52,
the rapid change of the sound pressure at the specific frequency can be prevented, so that the
high quality sound with less distortion can be generated. Vibration device can be obtained.
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[0038]
The peripheral portion of the second vibrating body 52 is entirely supported by the frame
members 5a and 5b, and the load member 41 is attached to the central portion of the second
vibrating body 52, so that a plurality of frequencies can be obtained. Sudden changes in
amplitude can be reduced. As described above, by attaching the load member 41 to a portion
where the amplitude is maximum at least at a part of the frequencies, it is possible to reduce a
sudden change of the amplitude at the frequency.
[0039]
Further, since the exciter 1 and the load member 41 are alternately arranged along the width
direction at the central portion in the longitudinal direction of the rectangular second vibrating
body 52, the vibration of the central portion in the longitudinal direction is entirely It is possible
to prevent the inhibition of the smooth vibration due to the exciter 1 and the load member 41
being disposed overlapping each other in the thickness direction of the second vibrating body
52.
[0040]
The vibration device of this example can be manufactured, for example, as follows.
[0041]
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 the internal electrode 9, and the
green sheet on which the conductor pattern is formed is laminated to produce a laminate molded
body.
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[0042]
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 of the laminate in the lamination direction to form conductor
patterns to be the surface electrode layers 15a and 15b, and on both sides of the laminate in the
longitudinal direction (x-axis direction in the figure), A conductor paste is printed to form a
conductor pattern to be an external electrode (not shown). 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 DC voltage is applied through the surface
electrode layers 15a and 15b or the external electrodes (not shown) to polarize the piezoelectric
layer 7 of the exciter 1. At this time, the polarization directions of the first and second layers and
the third and fourth dielectric layers 7 are made to be opposite to each other. Also, the
polarization directions of the second and third layers are the same. Thus, the exciter 1 shown in
FIGS. 1 and 2 can be obtained.
[0043]
Next, the second vibrating body 52 is prepared, the outer peripheral portion of the second
vibrating body 52 is sandwiched between the frame members 5a and 5b, and the second
vibrating body 52 is fixed in a tensioned state. Next, an adhesive is applied to one main surface of
the second vibrating body 52, the exciter 1 is pressed, the adhesive is cured by heat or ultraviolet
irradiation, and the exciter 1 is attached. Then, after connecting the conductive wires 20a, 20b
and 20c, the resin is poured into the inside of the frame member 5a and cured to form the resin
layer 20.
[0044]
In addition, the first vibrating body 51 is prepared, and the peripheral portion of the first
vibrating body 51 is adhered and fixed to the first frame member 3 in a tensioned state. Then,
the second frame member 5, the second vibrating body 52, the exciter 1, the conductors 20a,
20b, 20c and the resin layer 20 integrated with each other are used as the surface of the second
frame member 5 on the frame member 5b side. By bonding, it is attached to the central portion
of one main surface of the first vibrating body 51. Thus, the vibration device of this example can
be obtained.
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[0045]
Second Example of Embodiment FIG. 3 is a perspective view showing a sound generating
apparatus according to a second example of the embodiment of the present invention. The sound
generator of this example has a speaker 31 and a housing 32 as shown in FIG.
[0046]
The speaker 31 receives an electrical signal to generate sound (including sound outside the audio
frequency band), and although illustration of details is omitted, the speaker 31 may be a book
such as the first example of the embodiment described above. It comprises the vibration device of
the invention.
[0047]
The housing 32 has a rectangular box-like shape.
Further, the housing 32 has at least one opening, and the speaker 31 is attached to the at least
one opening. The housing 32 functions as a support for supporting the speaker 31. In addition,
the case 32 has a function to reduce the wraparound of the anti-phase sound generated from the
back surface of the speaker 31, and a function to internally reflect the sound generated from the
speaker 31. Such a housing 32 can be formed using various materials having a rigidity enough to
support the speaker 31. For example, the housing 32 can be formed using a material such as
wood, a synthetic resin, or a metal.
[0048]
The sound generation device of this example generates sound using the speaker 31 configured
by the vibration device of the present invention as in the first example of the embodiment
described above, so that the sound pressure is high in a wide frequency range. Sound can be
generated.
[0049]
Further, since the sound generator of this example has the housing 32, it can support the speaker
31 and can also make the generated sound better than the case of the speaker 31 alone.
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[0050]
Third Example of the Embodiment FIG. 4 is a perspective view schematically showing a speaker
system according to a third example of the embodiment of the present invention.
As shown in FIG. 4, the speaker system of the present example includes at least one high-pitched
speaker 33, at least one low-pitched speaker 34, and a support 35.
[0051]
The bass speaker 34 is a speaker mainly for outputting bass.
For example, it is used to output sound at a frequency of about 20 KHz or less. The treble
speaker 33 is a speaker mainly for outputting treble. For example, it is used to output sound at a
frequency of about 20 kHz or more. The high-pitched speaker 33 has a shape smaller than the
low-pitched speaker 34 (in the case of a rectangular shape or an elliptical shape, the longest side
is short) in order to facilitate the output of high-frequency sound. It has the same configuration
as the speaker 34. Note that the high-tone speaker 33 may have a configuration different from
that of the low-pitch speaker 34. Then, at least one of the high-pitched speaker 33 and the lowpitched speaker 34 is configured by the vibration device of the present invention as in the first
example of the embodiment described above.
[0052]
The support 35 accommodates and fixes the treble speaker 33 and the bass speaker 34 in the
two openings. That is, the support 35 functions as a support for supporting the high sound
speaker 33 and the low sound speaker 34. Such a support 35 can be formed using various
materials having rigidity enough to support the high-pitched speaker 33 and the low-pitched
speaker 34. For example, a material such as wood, synthetic resin, metal or the like is used. Can
be formed.
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[0053]
In the speaker system of this example provided with such a configuration, at least one of the
high-pitched speaker 33 and the low-pitched speaker 34 is configured by the vibrating device of
the present invention as in the first example of the embodiment described above. Thus, it is
possible to obtain a speaker system capable of generating sound with high sound pressure in a
wide frequency range.
[0054]
(Fourth Example of Embodiment) FIG. 5 is a diagram showing a configuration of an electronic
device 50 of a fourth example of the embodiment of the present invention.
As shown in FIG. 5, the electronic device 50 of this example includes the speaker 30, the housing
40, the electronic circuit 60, the key input unit 50c, the microphone input unit 50d, the display
unit 50e, and the antenna 50f. Have.
[0055]
The electronic circuit 60 has a control circuit 50a and a communication circuit 50b. Further, the
electronic circuit 60 is connected to the speaker 30, and has a function of outputting an audio
signal to the speaker. The control circuit 50 a is a control unit of the electronic device 50. The
communication circuit 50b transmits and receives data via the antenna 50f based on the control
of the control circuit 50a.
[0056]
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. 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 control circuit 50 a.
[0057]
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The speaker 30 is configured by the vibration device of the present invention as in the first
example of the embodiment described above, similarly to the speaker 31, the high sound speaker
33, and the low sound speaker 34 described above. The speaker 30 functions as an acoustic
output device in the electronic device 50, and generates acoustics (including acoustics outside
the audible frequency band) based on the audio signal input from the electronic circuit 60. The
speaker 30 is connected to the control circuit 50a of the electronic circuit 60, and generates a
sound in response to application of a voltage controlled by the control circuit 50a.
[0058]
The housing 40 has a function of housing and protecting the electronic circuit 60 and the like.
The speaker 30, key input unit 50c, microphone input unit 50d, display unit 50e, and antenna
50f are attached and fixed to the housing 40, and the housing 40 includes the speaker 30, key
input unit 50c, microphone input section It functions as a supporting member for supporting the
50d, the display unit 50e, and the antenna 50f. Although FIG. 5 shows that the speaker 30, the
electronic circuit 60, the key input unit 50c, the microphone input unit 50d, and the display unit
50e are accommodated in the housing 40, the present invention is limited thereto. It is not a
thing. The speaker 30, the electronic circuit 60, the key input unit 50c, the microphone input
unit 50d, the display unit 50e, and the like may be exposed on the surface of the electronic
device 50. Such a housing 40 can be formed using various materials having rigidity enough to
support the speaker 30 and the like, and can be formed using, for example, materials such as
wood, synthetic resin, metal, etc. .
[0059]
The electronic device 50 of this example generates sound using the speaker 30 configured by the
vibration device of the present invention as in the first example of the embodiment described
above, so that the sound pressure is high in a wide frequency range. Sound can be generated.
[0060]
The electronic device 50 may have at least the speaker 30, the support for supporting the
speaker 30, and the electronic circuit 60.
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The electronic device 50 does not have to include all the speaker 30, the housing 40, the
electronic circuit 60, the key input unit 50c, the microphone input unit 50d, the display unit 50e,
and the antenna 50f, and , May have other components. The electronic circuit 60 is not limited to
the electronic circuit 60 having the above-described configuration, but may be an electronic
circuit having another configuration.
[0061]
Moreover, the electronic device in which the speaker 30 is mounted is not limited to a mobile
terminal such as a mobile phone or a tablet terminal. In various electronic devices having a
function of generating sound, the speaker 30 using the vibration device as in the first example of
the embodiment described above can be used as a sound generation device. For example, in flatscreen TVs and car audio devices, it is needless to say that electronic devices such as vacuum
cleaners, washing machines, refrigerators, microwave ovens and the like having a function of
generating sound and voice are the first example of the above-mentioned embodiment. The
speaker 30 comprised by such a vibration apparatus can be used as an acoustic generator.
[0062]
(Modification) The present invention is not limited to the examples of the embodiments described
above, and various changes and improvements can be made without departing from the scope of
the present invention.
[0063]
For example, in the example of the embodiment described above, although two exciters 1 are
attached to one main surface of the second vibrating body 52 for ease of illustration, the present
invention is not limited to this. It is not something to be done.
For example, more exciters 1 may be attached to the second vibrating body 52.
[0064]
Further, in the example of the embodiment described above, although the example in which the
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exciter 1 which receives an electric signal and is bent and vibrated is attached to one main
surface of the second vibrating body 52 is shown, the invention is limited thereto. It is not a
thing. For example, by using four exciters 1 that receive an electrical signal and undergo
stretching vibration, two exciters 1 forming a pair are sandwiched between the second vibrator
52 on both sides of the second vibrator 52. When one exciter 1 constituting a pair is contracted,
the other exciter 1 may be extended.
[0065]
Furthermore, although the example in which one or three load members 41 are attached to the
second vibrating body 52 via the resin layer 20 is shown in the example of the embodiment
described above, the present invention is limited thereto is not. More load members 41 may be
attached, or the load members 41 may not be attached.
[0066]
Furthermore, although the example in which the resin layer 20 covering the surface of the
second vibrating body 52 and the exciter 1 is formed is shown in the example of the embodiment
described above, the present invention is not limited to this. The resin layer 20 may not be
formed.
[0067]
Furthermore, although the example using the piezoelectric element as the exciter 1 is shown in
the example of the embodiment described above, the present invention is not limited to this. The
excitation element 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 excitation element 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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[0068]
Moreover, in the example of embodiment mentioned above, although the case where the 1st
frame member 3 and the 2nd frame member 5 were rectangular frame shape was shown, it is not
limited to this. For example, it may be circular or elliptical. In addition, the first frame member 3
and the second frame member 5 may have different shapes.
[0069]
Furthermore, in the example of the embodiment described above, although the case where the
first vibrating body 51 and the second vibrating body 52 are made of different materials is
shown, the present invention is not limited to this, and the first vibrating body The 51 and the
second vibrator 52 may be made of the same material.
[0070]
Further, in the example of the embodiment described above, the first vibrating body 51 is
provided on the entire inside of the first frame member 3, and the second vibrating body 52 is on
the entire inside of the second frame member 5. Although the example provided in is shown, it is
not limited to this.
For example, the second vibrating body 52 is provided only in a part inside the second frame
member 5 (for example, in the center in the x-axis direction in FIG. 1 where the exciter 1 and the
load member 41 exist). It does not matter if you Similarly, the first vibrating body 51 may be
provided only on a part of the inside of the first frame member 3. For example, in FIG. 1, the first
vibrating body 51 may be provided only at the central portion in the x-axis direction, which is the
portion where the second frame member 5 and the second vibrating body 52 exist. . Further, the
first vibrating body 51 has a frame shape, and the outer peripheral edge of the frame-shaped
vibrating body 51 is fixed to the first frame member 3, and the inner peripheral edge of the
frame-shaped vibrating body 51 is It may be fixed to the second frame member 5. That is, the
first vibrating body 51 may not be provided in a portion of the second frame member 5 located
in the frame.
[0071]
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Next, a specific example of the vibration device of the present invention will be described. The
vibration device of the first example of the embodiment of the present invention shown in FIGS. 1
and 2 was manufactured to evaluate its performance.
[0072]
First, a piezoelectric powder containing lead zirconate titanate (PZT) in which a part of Zr is
replaced with Sb, a binder, a dispersant, a plasticizer, and a solvent are kneaded by ball milling
for 24 hours to obtain a slurry. Made. And the green sheet was produced by the doctor blade
method using the obtained slurry. A conductive paste containing Ag and Pd was applied to the
green sheet in a predetermined shape by screen printing to form a conductive pattern to be the
internal electrode layer 9. And the green sheet and other green sheets in which the conductor
pattern was formed were laminated | stacked and pressurized, and the lamination | stacking
molded object was produced. Then, the laminate was degreased in the air at 500 ° C. for 1 hour,
and then fired in the air at 1100 ° C. for 3 hours to obtain a laminate.
[0073]
Next, both end surface portions in the longitudinal direction of the obtained laminate were cut by
dicing to expose the tip of the internal electrode layer 9 on the side surface of the laminate. Then,
a conductor paste containing Ag and glass was applied to both main surfaces of the laminate by
screen printing to form surface electrode layers 15a and 15b and an electrode layer 19a.
Thereafter, a conductor paste containing Ag and glass was applied by dip method to both side
surfaces in the longitudinal direction of the laminate, and baked in the air at 700 ° C. for 10
minutes to form external electrodes. Thereby, a laminate was produced. The dimensions of the
main surface of the manufactured laminate were 18 mm in width and 46 mm in length. The
thickness of the laminate was 100 μm. Then, polarization was performed by applying a voltage
of 100 V for 2 minutes through the external electrode, to obtain an exciter 1 which is a bimorphtype laminated piezoelectric element.
[0074]
In addition, a first vibrating body 51 made of a film-shaped urethane foam having a thickness of
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0.5 mm is prepared, and the peripheral portion is adhered to the first frame member 3 with an
adhesive and cured in a tensioned state. Fixed. The first frame member 3 was made of stainless
steel having a thickness of 0.5 mm. The dimensions of the first vibrating body 51 of the first
frame member 3 were 130 mm in length and 100 mm in width.
[0075]
Next, a second vibrating body 52 made of a film-like polyimide resin having a thickness of 25
μm is prepared, and the peripheral portion is sandwiched between the frame members 5a and
5b of the second frame member 5 in a tensioned state. And then fixed. The frame members 5a
and 5b were each made of stainless steel having a thickness of 0.5 mm. The dimensions of the
second vibrating body 52 in the frame members 5a and 5b were 100 mm in length and 70 mm
in width. Then, the exciter 1 was bonded to the one main surface of the fixed second vibrating
body 52 with an adhesive made of an acrylic resin. The distance between adjacent exciters 1 was
10 mm. Thereafter, the conductors 2a, 2b and 2c were joined to the exciter 1 for wiring. Then,
the resin layer 20 was formed by filling the inside of the frame member 5a with an acrylic resin
having a Young's modulus after solidification of 17 MPa so as to have the same height as that of
the frame member 5a.
[0076]
Next, the load member 41 was attached to the surface of the resin layer 20 with an adhesive
made of acrylic resin. The load member 41 was made of urethane foam having a thickness of 1
mm. Then, the second frame member 5, the second vibrating body 52, the exciter 1, the
conductors 20a, 20b, 20c and the resin layer 20 integrated with each other are used as the
surface of the second frame member 5 on the frame member 5b side. It attached to the center
part of the one main surface of the 1st vibrating body 51 by bonding, and the vibrating device
shown in FIG. 1 and FIG. 2 was produced.
[0077]
And the frequency characteristic of the sound pressure of the sound generated from the
produced vibration apparatus was measured according to JEITA (Electronic Information
Technology Industries Association Standard) EIJA RC-8124A. In the measurement, a sine wave
signal with an effective value of 5 V was input between the conductors 22b and 22c of the
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vibration device, and a microphone was placed at a point of 0.1 m on the reference axis of the
vibration device to measure the sound pressure. The measurement result of the sound which
generate | occur | produces from the vibration apparatus of the 1st example of embodiment of
this invention is shown in FIG. Moreover, the measurement result of the sound which generate |
occur | produces from the vibration apparatus of the comparative example which does not have
the 1st frame member 3 and the 1st vibrating body 51 is shown in FIG. In the graphs of FIG. 6
and FIG. 7, the horizontal axis represents frequency, and the vertical axis represents sound
pressure.
[0078]
When compared with the frequency characteristic of the sound pressure of the sound generated
from the vibration device of the comparative example shown in FIG. 7, the frequency of the
sound pressure of the sound generated from the vibration device of the first example of the
embodiment of the present invention shown in FIG. In the characteristics, the sound pressure is
high particularly in the low frequency region around 100 Hz to 300 Hz, and it can be seen that
high sound pressure is obtained in a wide frequency region. This confirms the effectiveness of
the present invention.
[0079]
1: Excitation device 3: first frame member 5: second frame member 30, 31: speakers 32, 40:
housing 33: high-pitch speaker 34: bass speaker 35: support 51: first vibrator 52: second
vibrating body 50: electronic device 60: electronic circuit
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