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DESCRIPTION JP2012060513

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DESCRIPTION JP2012060513
An object of the present invention is to provide a vibratory apparatus which is hard to suppress
the displacement of a vibrator, can obtain a large displacement amount, and can be provided
without increasing the number of parts and the number of processing steps. A support sheet (3)
is attached to a diaphragm (2), and an extension part (3B) located outside the diaphragm
laminated part (3A) to which the diaphragm of the support sheet (3) is attached is frame-shaped
The support 4 is attached to be spaced apart from the outer peripheral edge of the diaphragm 2,
and the opening of the frame-shaped support 4 has a polygonal shape, and at the center of the
sides 4a to 4d of the opening. The support attached to the frame-like support 4 at the corner
portions 4 e to 4 h of the opening of the frame-like support 4 than the elastic modulus of the
support sheet part attached to the frame-like support 4 Vibration device 1 wherein the elastic
modulus of the seat portion is increased. [Selected figure] Figure 2
Vibration device
[0001]
The present invention relates to, for example, a vibration apparatus having a structure in which a
vibration plate made of a piezoelectric vibration plate is attached to a frame-like support via a
support sheet, and more specifically, the shape of the opening of the support is many. It relates
to a vibrating device that is square.
[0002]
2. Description of the Related Art Piezoelectric sounders and piezoelectric speakers are
conventionally used in mobile phones and various electronic devices in order to generate voice
and vibration.
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[0003]
For example, Patent Document 1 below discloses a piezoelectric acoustic component shown in
FIG. 10 in an exploded perspective view.
In the piezoelectric acoustic component 101, a metal plate 103 drawn in a cap shape on a
substrate 102 is fixed.
[0004]
On the upper surface of the metal plate 103, a plurality of slits 103a are arranged in a
rectangular frame shape.
The piezoelectric diaphragm 104 is bonded to the upper surface of the metal plate 103 in a
portion surrounded by the plurality of slits 103 a. A portion between the adjacent slits 103 a and
103 a, that is, a portion in which the slits are not formed is located in the vicinity of the corner
portion of the rectangular piezoelectric diaphragm 104. With the vibration of the piezoelectric
diaphragm 104, the metal plate portion surrounded by the plurality of slits 103a is largely
displaced. Therefore, a large sound can be obtained.
[0005]
On the other hand, Patent Document 2 below discloses a piezoelectric speaker shown in FIGS. 11
(a) and 11 (b). In the piezoelectric speaker 111, the piezoelectric element 112 is bonded to the
upper surface of the diaphragm 113 made of metal. The diaphragm 113 is stuck on the resin
plate 114 as a damper member. The resin plate 114 is fixed to the supports 115 and 116 at a
pair of opposing side portions of the resin plate 114. That is, the resin plate 114 having a
damping property is supported by the supports 115 and 116 so as not to prevent the vibration
of the piezoelectric element 112 and the vibration plate 113.
[0006]
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JP-A-11-355892 JP-A-9-2710196
[0007]
In the piezoelectric acoustic component 101 described in Patent Document 1, since the plurality
of slits 103a are formed in the metal plate 103, the displacement due to the piezoelectric effect
can be increased, and a large sound pressure can be obtained.
However, the cap-like metal plate 103 had to be prepared by drawing. Also, in order to separate
the air chamber, the slit 103a had to be filled with the sealing material. Therefore, there is a
problem that the processing process is complicated and the number of parts is increased.
[0008]
On the other hand, in the piezoelectric speaker 111 described in Patent Document 2, the pair of
long sides of the resin plate 114 is supported by the supports 115 and 116, but the resin plate
114 is supported on the pair of short sides. Absent. Therefore, at the pair of short sides of the
resin plate 114, it is necessary to use a sealing material to increase the support strength.
Therefore, there is a problem that the number of parts also increases and the processing process
becomes complicated. In addition, since the resin plate 114 is firmly supported on the pair of
long sides, the displacement tends to be suppressed on the pair of long sides. Therefore, there is
a possibility that the displacement of the vibrator including the piezoelectric element 112 and
the diaphragm 113 may be reduced.
[0009]
SUMMARY OF THE INVENTION The object of the present invention is to solve the abovementioned drawbacks of the prior art, to suppress the displacement of the vibrator, to obtain a
large displacement amount, and to provide the same without increasing the number of parts and
the number of processing steps. To provide a vibrating device capable of
[0010]
The vibrating device according to the present invention includes a diaphragm, the diaphragm
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laminated portion affixed to the diaphragm, and an extension portion protruding to the outside of
the diaphragm laminated portion. And a frame-shaped support affixed to the extension of the
support sheet and spaced from the outer peripheral edge of the diaphragm.
In the present invention, the frame-like support has an opening having a polygonal shape in
which a plurality of sides and portions where adjacent sides connect are corner portions, and the
support of the support sheet The elastic modulus of the portion of the support sheet attached to
the corner of the opening of the support is higher than the elastic modulus of the portion of the
support attached to the central portion of the side of the opening.
[0011]
In a specific aspect of the vibration device according to the present invention, the corner portion
of the opening of the support of the support sheet from the portion of the support sheet attached
to the center of the side of the opening of the support. The modulus of elasticity of the support
sheet is increased as it goes to the part where it is attached.
[0012]
In another aspect of the vibration device according to the present invention, the opening of the
frame-like support is rectangular.
[0013]
In the present invention, the planar shape of the diaphragm is not particularly limited, but in still
another specific aspect of the present invention, the diaphragm is in the shape of a rectangular
plate.
[0014]
In still another particular aspect of the vibration device according to the present invention, the
diaphragm is a piezoelectric vibrator.
[0015]
In still another specific aspect of the vibration device according to the present invention, the
piezoelectric vibrator includes a metal plate and a piezoelectric element bonded to one surface of
the metal plate.
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[0016]
In still another particular aspect of the vibration device according to the present invention, the
support sheet is made of a synthetic resin film.
[0017]
In the vibration device according to the present invention, although the support sheet is attached
to the frame-like support, the support is supported more than the elastic modulus of the support
sheet portion attached to the central part of the side of the opening of the support. Since the
elastic modulus of the support sheet portion affixed to the corner of the opening of the body is
increased, the displacement of the entire diaphragm can be increased.
Therefore, a large sound pressure and a large vibration can be obtained.
Moreover, since the vibration device of the present invention only has the support structure in
which the support sheet is attached to the frame-like support, the number of parts does not
increase.
In addition, the complexity of the processing steps can be avoided.
Therefore, a vibration device having a large displacement can be provided at low cost.
[0018]
(A) And (b) is a top view of a vibrator concerning one embodiment of the present invention, and a
sectional view of a portion which meets a B-B line in (a), and (c) is used It is front sectional
drawing of a piezoelectric element.
(A) And (b) is a typical top view and a typical bottom view for explaining elastic modulus
distribution of a support film in a vibrating device of one embodiment of the present invention,
and (c) is (b) It is sectional drawing of the part which follows the C-C line in the inside.
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It is a typical perspective view showing displacement distribution of a vibration device prepared
for comparison. It is a typical perspective view for explaining displacement distribution of a
vibrating device concerning one embodiment of the present invention. It is a figure which shows
the relationship of the area | region and elastic modulus of the support sheet in the vibration
apparatus prepared as one Embodiment and comparative example of this invention. It is a
schematic plan view for demonstrating elastic modulus distribution in the vibration apparatus of
one Embodiment of this invention. (A) And (b) is a typical top view and a typical bottom view for
explaining distribution of an elastic modulus of a support sheet in a vibrator of other
embodiments of the present invention. (A) And (b) is a top view and a bottom view of a vibrator
concerning another embodiment of the present invention. It is front sectional drawing for
demonstrating the further another example of the diaphragm used with the vibration apparatus
of this invention. It is a disassembled perspective view of the conventional piezoelectric type
electroacoustic transducer. (A) And (b) is a perspective view which shows an example of the
conventional piezoelectric speaker, and sectional drawing of the part which follows the BB line in
(a).
[0019]
Hereinafter, the present invention will be clarified by describing specific embodiments of the
present invention with reference to the drawings.
[0020]
Fig.1 (a) is a top view which shows the vibration apparatus based on one Embodiment of this
invention, (b) is sectional drawing of the part which follows the BB line in (a).
[0021]
The vibration device 1 of the present embodiment includes a diaphragm 2, a support sheet 3
attached to the diaphragm 2, and a frame-shaped support 4 disposed so as to surround the
support sheet 3.
[0022]
The diaphragm 2 has a rectangular plate shape.
Although a part of the diaphragm 2 is schematically shown in FIG. 1 (b), the diaphragm 2 is
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actually formed on both sides of the laminated piezoelectric body 2a and the laminated
piezoelectric body 2a. It has electrodes 2b and 2c.
The laminated piezoelectric body 2a is made of PZT having two or more piezoelectric layers.
[0023]
The upper and lower piezoelectric layers are polarized in the thickness direction so that they
expand and contract in reverse when an electric field is applied.
Therefore, the diaphragm 2 is excited in the bending vibration mode by applying an alternating
electric field from the electrodes 2b and 2c. That is, the diaphragm 2 is a piezoelectric vibrator in
the present embodiment. The diaphragm may be attached to both sides of the support sheet.
[0024]
The structure of the piezoelectric vibrator is not limited to the one using the laminated
piezoelectric body 2a shown in FIG. 1 (c). For example, as in a diaphragm 2A shown in FIG. 9, it
may be a unimorph type piezoelectric vibrator in which a piezoelectric layer 2e and an electrode
2f polarized in the thickness direction are stacked on a metal plate 2d. Furthermore, in the
present invention, the diaphragm 2 may be a vibrator other than the piezoelectric vibrator.
[0025]
As shown in FIGS. 1A and 1B, the diaphragm 2 is attached to the upper surface of the support
sheet 3. This attachment can be performed using an appropriate bonding material such as an
adhesive. Although the support sheet 3 is not particularly limited, in the present embodiment, the
support sheet 3 is made of a synthetic resin film. The support sheet 3 is not limited to a synthetic
resin film, and may be formed of a metal plate.
[0026]
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The support sheet 3 is connected to the diaphragm laminated portion 3A to which the
rectangular diaphragm 2 is attached, and the diaphragm laminated portion 3A, and has a
rectangular frame shape extending to the outside of the diaphragm laminated portion 3A. And an
extending portion 3B. An outer portion in the rectangular frame-like extension 3 B is fixed by a
frame-like support 4.
[0027]
The frame-like support 4 has a rectangular frame-like planar shape in the present embodiment.
That is, the frame-shaped support 4 has a rectangular opening. The rectangular opening has a
pair of opposing long sides 4a and 4b and a pair of opposing short sides 4c and 4d. An adjacent
side, that is, a portion where the sides 4a and 4c are connected is referred to as a first corner
portion 4e. In addition, the second corner 4f is connected to the side 4b and the side 4c, and the
third corner 4g is connected to the side 4a and the side 4d. The portion in which it is located is
referred to as a fourth corner 4h.
[0028]
The frame-shaped support 4 has metal plates 4i and 4j. The metal plates 4i and 4j are pasted
together so as to sandwich the support sheet 3. This bonding can be performed using an
appropriate bonding material such as an adhesive.
[0029]
In addition, the frame-shaped support body 4 can be formed not only by metal but by other rigid
materials such as ceramics and synthetic resin.
[0030]
In the present embodiment, the metal plate 4i and the metal plate 4j have the same planar shape,
but may have different planar shapes.
For example, the metal plate 4j may be protruded to the outer side than the metal plate 4i, and
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an electrical connection or the like may be performed in the part where the metal plate 4i is
protruded.
[0031]
In the vibration device 1 of the present embodiment, when the diaphragm 2 made of the
piezoelectric vibrator is excited in the bending mode, the diaphragm 2 is supported by the
support sheet 3 having flexibility, so the displacement of the diaphragm 2 is Is not disturbed so
much. In particular, the feature of the present embodiment is that the elastic modulus of the
support sheet 3 is partially different, which makes it possible to obtain a large amount of
displacement. This will be described more specifically with reference to FIGS.
[0032]
In the vibration device 1 of the present embodiment, the support sheet 3 has an elastic modulus
distribution. FIG. 2A is a plan view of the vibration device 1 schematically showing the elastic
modulus distribution in the support sheet 3. FIG.2 (b) is a bottom view of the said vibrating
device 1, and the elastic modulus distribution of the said support sheet 3 is typically shown in
FIG.2 (b). That is, the support sheet 3 has the area 3a having the highest elastic modulus in the
vicinity of the first to fourth corner portions 4e to 4h of the frame-like support 4 described
above, and the elastic modulus as the distance from the area 3a increases. The areas 3b, 3c, 3d
and 3e are sequentially lowered.
[0033]
Therefore, in the portion of the support sheet 3 attached to the frame-shaped support 4, the
frame shape of the support sheet 3 is more than the elastic modulus of the support sheet portion
attached to the central portion of the sides 4 a to 4 d. The elastic modulus of the portions
attached to the corner portions 4e to 4h of the opening of the support 4 is increased, that is, the
area 3a. Further, in the present embodiment, the elastic modulus of the support sheet 3 is from
the support sheet portion attached to the central portion of the sides 4a to 4d toward the support
sheet portion attached to the corner portions 4e to 4h. It is getting higher continuously.
[0034]
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Further, as shown in FIG. 2C, the elastic modulus of the support sheet 3 is also from the area 3e
also in the portion directed from the central portion of the support sheet 3 toward the first
corner 4e in the diagonal direction of the support sheet 3. The elastic modulus is increased in the
order of region 3d, region 3c, region 3b, and region 3a.
[0035]
In the vibration device 1 of the present embodiment, since the support sheet 3 has the above
elastic modulus distribution, a large displacement amount can be obtained.
This will be described based on a specific experimental example.
[0036]
In this experimental example, the diaphragm 2 is made of PZT and used is a laminated
piezoelectric body having six piezoelectric layers of 16 mm in length × 12 mm in transverse
wave × 100 μm in thickness. The upper and lower electrodes 2b and 2c are made of Ag / Pd
and have a thickness of 1 μm.
[0037]
The frame-like support 4 was formed by laminating metal plates 4i and 4j with a thickness of 0.2
mm.
[0038]
The opening of the frame-shaped support 4 is a rectangular opening having a length of 17 mm
on the sides 4a and 4b.
[0039]
As the support sheet 3, a synthetic resin film made of rubber, plastic or the like having a
thickness of 100 μm was used.
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However, in the regions 3a to 3e, a synthetic resin film having a structure in which the elastic
modulus changes as shown by the solid line in FIG. 5 was used.
Such a synthetic resin film having a partially different elastic modulus has a method of making
the content of the additive in the synthetic resin film different in the regions 3a to 3e, or making
the degree of crosslinking of the synthetic resin film different in the regions 3a to 3e It can be
obtained by a method or the like.
[0040]
For comparison, a comparative example is carried out in the same manner as the above
embodiment except that a supporting sheet having a constant elastic modulus as shown by a
broken line in FIG. 5 is used instead of the supporting sheet 3. The vibration device of was
prepared.
[0041]
FIG. 3 is a perspective view schematically showing a displacement shape by the finite element
method when a voltage of 8 V is applied to the vibration device of the above embodiment.
FIG. 4 is a schematic perspective view showing a displacement shape by finite element simulation
of a vibration device prepared as an experimental example of the embodiment. 3 and 4 show the
displacement shape. That is, the support sheet 3 vibrates together with the diaphragm 2, but is
restrained by the frame-shaped support 4. Therefore, the displacement shape shown in FIGS. 3
and 4 shows the displacement shape of the structure composed of the diaphragm 2 and the
support sheet 3 in the opening of the frame-like support 4.
[0042]
The numerical values in the z direction in FIG. 3 and FIG. 4 indicate normalized displacement
amounts in the portions where the support sheet 3 is attached to the sides 4 a and 4 d of the
opening of the frame-like support 4. The numerical values in the x and y directions indicate
position coordinates.
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[0043]
As apparent from the comparison between FIG. 3 and FIG. 4, it can be seen that, according to the
embodiment, a large amount of displacement can be obtained as compared with the comparative
example. That is, it is understood that the corner portion is relatively largely displaced in the
negative direction at the corner portion surrounded by the circle X indicated by the broken line
in FIG. On the other hand, as shown in FIG. 4, in the above embodiment, it is understood that the
displacement in the negative direction at the portion surrounded by the circle Y indicated by the
broken line, that is, the corner portion is very small.
[0044]
In the corner portions 4e to 4h in FIG. 6, that is, a portion surrounded by a circle Y indicated by a
broken line, the displacement is made extremely small, and in particular, the displacement in the
negative direction is small. On the other hand, the amount of displacement is large at the central
portion of the sides 4a to 4d surrounded by the circle Z. This is because the support sheet 3
having the elastic modulus distribution is used. Therefore, in the vibration device 1 of the present
embodiment, the amount of displacement of the structure in which the diaphragm 2 is joined to
the support sheet 3 can be dramatically increased, and a large sound pressure can be obtained.
[0045]
As described above, a large amount of displacement can be obtained in the present embodiment
only by providing the support sheet 3 with the elastic modulus distribution. Therefore, it is
possible to provide a vibrating device capable of obtaining a large sound pressure without
increasing the number of parts or causing complication of the assembly process.
[0046]
FIGS. 7 (a) and 7 (b) are a schematic plan view and a schematic bottom view for explaining a
vibration device according to a second embodiment of the present invention.
[0047]
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Also in FIGS. 7A and 7B, the elastic modulus distribution of the support sheet 3 is schematically
shown as in FIGS. 2A and 2B.
That is, the elastic moduli of the regions 3a to 3e are different as in the first embodiment. The
second embodiment is different from the first embodiment in that the planar shape of the framelike support 4B is different, and the other points are the same as the first embodiment.
[0048]
The opening of the frame-shaped support 4B has a substantially rectangular shape. That is, the
opening bulges outward at the central portion of the sides 4a to 4d. Therefore, the distance
between the diaphragm 2 and the frame-shaped support 4 is relatively large at the centers of the
sides 4a to 4d as compared with the corner portions 4e to 4h. In other words, the distance
between the diaphragm 2 and the frame-shaped support 4 decreases as going from the center of
the sides 4a to 4d to the corners 4e to 4h.
[0049]
Thus, the displacement of the support sheet 3 at the corner portion is reduced by reducing the
distance between the diaphragm 2 and the frame-like support 4 at the corner portions 4e to 4h
as compared with the central portion of the sides 4a to 4d. It can be made smaller. Further, the
displacement on the center side of the sides 4a to 4d can be made larger, whereby the amount of
displacement of the structure in which the diaphragm 2 is joined to the support sheet 3 can be
effectively increased. As described above, the displacement amount can be further expanded by
adjusting the distance between the frame-shaped support 4 and the diaphragm 2 as well as
providing the elastic modulus distribution to the support sheet 3.
[0050]
FIGS. 8 (a) and 8 (b) are a schematic plan view and a schematic bottom view for explaining a
vibration device according to a third embodiment of the present invention. In the present
embodiment, the support sheet 13 is used. The third embodiment is configured in the same
manner as the first embodiment except that the support sheet 13 is used instead of the support
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sheet 3.
[0051]
The support sheet 13 has a sheet body 13a. For example, the sheet main body 13a made of
rubber, plastic or the like is a normal synthetic resin film whose elastic modulus is uniform over
the entire area. In the support sheet 13, the high elastic modulus layer 13b is partially laminated
on both sides of the sheet main body 13a. The high elastic modulus layer 13 b is laminated in the
vicinity of the corner portions 4 e to 4 h of the frame-shaped support 4 described above.
[0052]
The high elastic modulus layer 13 b is made of a material having a higher elastic modulus than
the sheet main body 13 a. Such a material is not particularly limited as long as the elastic
modulus is higher than that of the sheet body 13a. For example, the high elastic modulus layer
13b may be formed of a composition obtained by further adding an additive for enhancing the
elastic modulus to the synthetic resin constituting the sheet body 13a. Alternatively, the high
elastic modulus layer 13b may be formed of a resin material different from that of the sheet body
13a.
[0053]
Further, the high elastic modulus layer 13b may be made of a material other than resin.
[0054]
In the third embodiment, since the high elastic modulus layer 13b is present at the corner
portions 4e to 4h, the elasticity of the support sheet portion affixed to the center of the sides 4a
to 4d as in the first embodiment. The elastic modulus of the portion of the support sheet attached
to the frame-like support 4 at the corner portions 4e to 4h is relatively higher than the rate.
Therefore, as in the first embodiment, a large amount of displacement can be obtained.
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[0055]
In the first to third embodiments described above, the opening of the frame-shaped support 4
has a rectangular planar shape, but it has other polygonal shapes such as pentagons and
hexagons other than rectangular. It may be done. In any case, the elastic modulus of the support
sheet portion adhered to the corner of the polygon is higher than the elastic modulus of the
support sheet of the portion adhered to the central portion of the plurality of sides in the
polygon. For example, a large amount of displacement can be obtained as in the above
embodiment.
[0056]
Further, in the first embodiment, from the portion attached to the central portion of the sides 4a
to 4d of the frame-like support 4 to the support sheet portion attached to the corner portions 4e
to 4h, Although the elastic modulus of the support sheet 3 was continuously raised, as in the
third embodiment, the change in the elastic modulus may be stepwise.
[0057]
In the first to third embodiments, the diaphragm 2 has a rectangular plate shape, but may have a
planar shape other than the rectangular plate shape, for example, a circular shape or the like.
[0058]
DESCRIPTION OF SYMBOLS 1 ... Vibration apparatus 2 ... Vibrating plate 2A ... Vibrating plate 2a
... Laminated-type piezoelectric material 2b, 2c ... Electrode 2d ... Metal plate 2e ... Piezoelectric
layer 2f ... Electrode 3 ... 3e: Region 4: Support 4B: Support 4a-4d: Side 4e: First corner 4f: Second
corner 4g: Third corner 4h: Fourth corner 4i, 4j: Metal Plate 13 ... support sheet 13a ... sheet
body 13b ... high elastic modulus layer
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