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DESCRIPTION JP2015149663

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DESCRIPTION JP2015149663
Abstract: PROBLEM TO BE SOLVED: To provide a vibration transmission device and a
piezoelectric speaker that can withstand an impact such as a drop while securing a vibration
transmission efficiency. SOLUTION: The displacement of the weight portion 5 is regulated by the
inner peripheral surface of the support base 2 and presses the piezoelectric element 2 to bring
the weight 5 into contact with the mounting portion 20 on the inner peripheral surface of the
support base 2. The displacement of the piezoelectric element 1 is larger than the flexural
vibration amplitude and smaller than the upper limit displacement at which the piezoelectric
element 1 can be elastically deformed, and the vibration transmitting the vibration of the
piezoelectric element 1 to the mounting object on which the mounting portion 20 is mounted It
is a transmission device. [Selected figure] Figure 2
Vibration transmission device and piezoelectric speaker
[0001]
The present invention relates to a vibration transmission device that transmits a vibration
including an audible range to a mounted body, and a piezoelectric speaker that generates sound
from the mounted body.
[0002]
There has been proposed a vibration transmission device that transmits the vibration of the
piezoelectric element with the vicinity of the weight as the center of inertia.
[0003]
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1
For example, in paragraph 0010 of FIG. 7 and FIG. 7 etc., a configuration is disclosed in which
the vibration of the piezoelectric vibrator is directly transmitted to the case which is the mounted
body by attaching a weight to the central portion of the circular piezoelectric vibrator. ing.
[0004]
JP-A-7-213997
[0005]
In the configuration shown in FIG. 7 of Patent Document 1, when the center of inertia is brought
close to the vibrating portion of the piezoelectric element by the weight to improve the vibration
transmission efficiency, the piezoelectric element is easily susceptible to inertial force and can
withstand impact such as falling. There is a problem that it is difficult to configure a piezoelectric
element.
[0006]
An object of the present invention is to provide a vibration transmission device and a
piezoelectric speaker that can withstand an impact such as a drop while securing the vibration
transmission efficiency.
[0007]
According to the present invention, the present invention provides a rectangular plate-like
piezoelectric element that performs bending vibration, a support base including a mounting
portion and a support portion, and a weight portion, wherein the piezoelectric element is
supported and fixed to the support portion. The fixed part in the part is fixed to the part of the
piezoelectric element that vibrates piezoelectric directly or via the support part, the weight part
is disposed in the internal space of the support base, and the parts other than the fixed part are
fixed. When separated from the support, the displacement of the weight is restricted by the inner
peripheral surface of the support, and the piezoelectric element is pressed to contact the
mounting portion on the weight and the inner peripheral surface of the support. The
displacement of the piezoelectric element is larger than the amplitude of the bending vibration
and smaller than the upper limit displacement at which the piezoelectric element can be
elastically deformed, and the vibration of the piezoelectric element is applied to the mounting
object on which the mounting portion is mounted. It can be solved by the vibration transmission
device to transmit That.
[0008]
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This is because by enclosing the weight inside the support, excessive displacement of the weight
can be restricted by the inside of the support, especially at the mounting portion, and damage to
the piezoelectric element can be prevented in advance. It is.
[0009]
Preferably, the support is integrally formed of a bent metal plate, and the piezoelectric element is
supported and fixed on the support on the outer peripheral surface of the support.
[0010]
This is because, by configuring the support base with the bent metal plate, sufficient product
strength can be obtained even with a small size.
[0011]
Further, it is preferable that an adhesive portion is provided on the mounting portion on the
outer peripheral surface of the support table, and the adhesive can be fixed to an object to be
mounted.
[0012]
This is because when the pressure is applied from near the center of the piezoelectric element,
the weight contacts the inner circumferential surface of the mounting portion to transmit the
pressing force, thereby enabling uniform pressing on the entire outer circumferential surface of
the mounting portion that is the bottom surface. This is because the entire surface is in close
contact with the mounted body and can be adhesively fixed to the mounted body with sufficient
strength.
[0013]
Moreover, it is desirable that the fixation of the fixed portion be performed by an adhesive.
[0014]
This is because the separation distance between the weight portion and the support can be
adjusted before the adhesive is cured, and displacement control of the weight portion can be
accurately performed.
[0015]
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Moreover, as for the said adhesive agent which fixes the said to-be-fixed part, it is desirable to
have elasticity after hardening.
[0016]
This is because by giving elasticity to the adhesive, even if an impact such as a drop is applied to
the vibration transmission device, the impact from the weight portion to the piezoelectric
element is alleviated, and thus the piezoelectric element can be protected. It is.
[0017]
Further, the support base is integrally formed from the first support portion to the second
support portion via the first connection portion, the mounting portion, and the second
connection portion, and the first support portion and the second support portion are separated.
The both ends of the piezoelectric element are arranged on the outer surfaces of the support
base and fixed on the first support portion and the second support portion by an adhesive, and
the fixed portion in the weight portion is the piezoelectric It is desirable that the element be
directly fixed to the central portion that causes piezoelectric vibration.
[0018]
This is because the separation distance between the piezoelectric element and the support can be
adjusted before the adhesive is cured, and excessive displacement of the weight portion can be
accurately controlled.
[0019]
Further, it is preferable that the weight portion can be inserted between the first support portion
and the second support portion.
[0020]
This is because the workability of the assembly process is improved by making the weight part
insertable between the first support part and the second support part.
[0021]
Moreover, as for the said weight part, it is desirable for the area of the part which opposes the
said mounting part to be larger than the area in a to-be-fixed part.
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[0022]
This is because the weight should have a small area of the fixed portion so as not to inhibit the
bending vibration of the piezoelectric element.
On the other hand, since the center of the piezoelectric element should act as the center of
inertia, the area of the portion facing the mounting portion should be increased in order to
secure the mass of the weight portion.
[0023]
In addition, the above-described vibration transmission device may be mounted to constitute a
piezoelectric speaker that generates sound from at least a part of the mounted body.
[0024]
According to the present invention, the piezoelectric element is protected by restricting the
displacement of the weight due to the impact, and by forming the supporting portion by the bent
metal plate, the assembly workability is good, and the adhesive fixing with sufficient strength to
the mounting object It is possible to provide a vibration transmission device that is possible,
compact and of sufficient product strength.
[0025]
It is a top view of the vibration transmission device in the present invention.
It is sectional drawing of the vibration transmission apparatus in this invention, and respond |
corresponds to the cross section of AA surface in FIG.
It is sectional drawing which shows the state which mounts the vibration transmission apparatus
in this invention.
It is sectional drawing which shows the assembled state of the vibration transmission apparatus
in this invention.
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5
It is a figure which shows the sound pressure of the vibration transmission apparatus in this
invention, and the relationship of a frequency.
[0026]
FIG. 1 is a plan view of a vibration transmission device according to the present invention.
[0027]
The vibration transmission device in the present embodiment includes a rectangular plate-shaped
piezoelectric element 1 that performs bending vibration, and a support 2 that supports the
piezoelectric element 1.
[0028]
In addition, the piezoelectric element 1 is conductively connected to the drive electrode and the
FPC 10 which is a flexible printed board, and the FPC 10 is conductively connected to an external
drive circuit (not shown) to enable the bending movement of the piezoelectric element 1.
[0029]
Moreover, the separator 3 of the double-sided adhesive tape which is not shown in figure in FIG.
1 is derived | led-out.
[0030]
FIG. 2 is a cross-sectional view of the vibration transmission device in the present invention,
which corresponds to the cross section of the AA plane in FIG.
[0031]
The piezoelectric element is constituted of a piezoelectric body portion 11 and an elastic
protection portion 12.
[0032]
The weight portion 5 is bonded and fixed to a central portion of the piezoelectric body portion
11 by a bonding portion 40.
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[0033]
The double-sided adhesive tape 30 is adhesively fixed on the mounting portion 20 on the outer
peripheral surface of the support base 2, and the separator 3 is attached to the mounting surface
of the double-sided adhesive tape 30.
[0034]
The separator 3 has a portion extended from a portion to which the double-sided adhesive tape
30 is attached, and the separator 3 can be peeled off from this portion.
[0035]
The piezoelectric body portion 11 is adhered and fixed on the support portions 21 and 22 on the
outer peripheral surface of the support base 2 by adhesion portions 41 and 42.
[0036]
That is, both end portions of the piezoelectric body portion 11 are fixed to the support portions
21 and 22 via the bonding portions 41 and 42.
[0037]
The bottom surface 50 of the weight portion 5 faces the mounting portion 20 on the inner
peripheral surface of the support base 2, and the distance between the bottom surface 50 and
the mounting portion 20 is larger than the amplitude due to the bending vibration of the
piezoelectric body portion 11, and the piezoelectric body portion 11 can be elastically deformed.
Less than the upper limit displacement.
[0038]
Thus, excessive displacement of the weight portion 5, that is, excessive displacement of the
central portion of the piezoelectric portion 11 is restricted without inhibiting the piezoelectric
vibration of the piezoelectric portion 11, and damage to the piezoelectric portion 11 is prevented
in advance. Can.
[0039]
Further, by giving elasticity to the bonding portions 40, 41, 42, even if an impact such as a drop
is applied to the vibration transmission device, the impact from the weight portion 5 to the
piezoelectric portion 11 is alleviated, so the piezoelectric body The protection of part 11 can be
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strengthened.
[0040]
Here, it is desirable that the area of the fixed portion be small so as not to inhibit the bending
vibration of the piezoelectric body portion 11, and the weight portion 5 should act so that the
central portion of the piezoelectric body portion 11 is an inertia center, In order to secure the
mass of the weight portion 5, it is desirable that the area of the bottom surface 50 facing the
mounting portion be at least larger than the area of the portion to be fixed.
[0041]
FIG. 3 is a cross-sectional view showing a state in which the vibration transmission device
according to the present invention is mounted.
[0042]
That is, FIG. 3 shows a state in which the separator of the vibration transfer device in FIG. 2 is
peeled off and mounted on the mounted body 6.
[0043]
At the time of mounting, the bottom surface 50 of the weight portion 5 contacts the mounting
portion 20 on the inner peripheral surface of the support base 2 by pressing the central portion
of the piezoelectric body portion 11 through the elastic protection portion 12 and the pressure is
double-sided. In order to press the adhesive tape 30 against the mount 6, the entire adhesive
surface of the double-sided adhesive tape 30 is in close contact with the mount 6, and the
vibration transmitting device is adhesively fixed to the mount 6 with sufficient strength. it can.
[0044]
Here, since the displacement of the piezoelectric body portion 11 is smaller than the upper limit
displacement that can be elastically deformed as described above, the piezoelectric body portion
11 is not damaged even by such a mounting method.
[0045]
FIG. 4 is a cross-sectional view showing the assembled state of the vibration transmission device
in the present invention.
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[0046]
That is, FIG. 4 shows an assembled state of the vibration transmission device in FIG.
[0047]
First, an adhesive is applied and cured to bond the central portion of the piezoelectric portion 11
and the weight portion 5 via the bonding portion 40.
[0048]
Next, the spacer 7 is placed on the mounting portion 20 on the inner peripheral surface of the
support base 2, and the adhesives 410 and 420 are applied on the support portions 21 and 22
on the outer peripheral surface of the support base 2.
[0049]
Here, since the distance between the support portions 21 and 22 is larger than the bottom
surface 50 of the weight portion 5, the bottom surface 50 of the weight portion 5 can be placed
on the spacer 7. The space between the two ends of the piezoelectric body portion 11 is filled
with the adhesive 410, 420.
[0050]
Furthermore, the adhesives 410 and 420 are cured by heat or the like, and then the spacer 7 is
removed.
[0051]
Finally, the double-sided pressure-sensitive adhesive tape 30 with the separator 3 attached is
attached onto the mounting portion 20 on the outer peripheral surface of the support 2 to
complete the vibration transmission device of FIG.
[0052]
Thus, the vibration transmission device of the present embodiment can be assembled with good
workability.
[0053]
In addition, the separation distance between the weight portion and the support can be adjusted
before curing the adhesives 410 and 420, and displacement control of the weight portion can be
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performed with high accuracy.
[0054]
Thus, the adhesives 410 and 420 can be cured by the spacer 7 while keeping the distance
between the bottom surface 50 of the weight 5 and the mounting portion 20 on the inner
circumferential surface of the support 2 constant.
[0055]
That is, a rectangular plate-shaped piezoelectric element 1 that performs bending vibration, a
support 2 on which the mounting portion 20 and the support portions 21 and 22 are integrally
formed, and a weight portion 5 are provided. The fixed part of the weight 5 is fixed to the portion
of the piezoelectric element 1 that is subject to piezoelectric vibration, the weight 5 is enclosed
by the support 2, and the parts other than the fixed are separated from the support 2. The
displacement of the weight portion 5 is regulated by the inner peripheral surface of the support
base 2 and presses the piezoelectric element 1 to contact the mounting portion 20 on the inner
peripheral surface of the weight portion 5 and the support base 2 Is larger than the amplitude of
the bending vibration and smaller than the upper limit displacement at which the piezoelectric
element 1 can be elastically deformed, and the vibration transmission for transmitting the
vibration of the piezoelectric element 1 to the mounted body 6 on which the mounting portion
20 is mounted An embodiment of the device can be taken.
[0056]
Thus, by enclosing the weight 5 inside the support 2, excessive displacement of the weight 5 can
be restricted by the inside of the support 2, especially the mounting portion 20, and damage to
the piezoelectric element 1 can be prevented. Can be prevented.
[0057]
The piezoelectric body portion 11 is constituted by a piezoelectric laminated bimorph element
having a length of 23 mm, a width of 3.3 mm, and a thickness of 1.2 mm, and the support base 2
bends a SUS plate having a thickness of 0.3 mm and a width of 4.0 mm. The weight 5 was made
of tungsten having a weight of 5 g.
[0058]
Considering that the piezoelectric vibration amplitude 0.05 mm of the piezoelectric body 11 and
elastic deformation displacement up to 0.3 mm are possible, the bottom surface 50 of the weight
5 and the mounting portion 20 on the inner circumferential surface of the support 2 The interval
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was 0.2 mm.
[0059]
Here, the support 2 configured by a metal plate obtained by bending the support 2 can be small
and obtain sufficient strength.
[0060]
The dimensions of the entire vibration transmission device excluding the separator 3 were 30
mm in length, 4.0 mm in width, and 5.0 mm in height.
[0061]
The vibration transmission device was mounted on a 100 mm × 60 mm, plate-shaped mounting
body having a thickness of 3 mm, and the sound pressure at a position 1 m away from the
mounting body was measured.
[0062]
FIG. 5 is a diagram showing the relationship between the sound pressure and the frequency of
the vibration transfer device according to the present invention.
[0063]
The sound pressure exceeds 60 dB in the audible range of frequencies from 800 Hz to 3.4 kHz,
showing sufficient characteristics as a piezoelectric speaker.
[0064]
DESCRIPTION OF SYMBOLS 1 piezoelectric element 2 support stand 3 separator 5 weight part 6
mounted body 7 spacer 10 FPC 11 piezoelectric body part 12 elastic protection part 20
mounting part 21 and 22 support part 30 double-sided adhesive tape 40, 41, 42 bonding part
50 bottom surface 410, 420 adhesive
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