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JP2007243584

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DESCRIPTION JP2007243584
An object of the present invention is to reduce a transmission loss of vibration energy and to
increase a generated sound volume. A sound generator includes a piezoelectric vibrator, a
housing containing a piezoelectric vibrator, and a piezoelectric vibrator so that the piezoelectric
vibrator does not touch the housing inside the housing. And a supporting support. The support
and the housing are bonded by an adhesive of any of a two-component acrylic type, an epoxy
type, and a one-component type cyanone. [Selected figure] Figure 1
Sound generator
[0001]
The present invention relates to a sound generator.
[0002]
2. Description of the Related Art Heretofore, among sound generation devices, ones in which a
piezoelectric vibration element is built in a resin case are known.
FIG. 7 is an exploded perspective view showing a schematic configuration of the sound generator
100. As shown in FIG. As shown in FIG. 7, in the sound generating apparatus 100, the
piezoelectric vibrating element 101, a casing 102 made of resin containing the piezoelectric
vibrating element 101, and the piezoelectric vibrating element 101 inside the casing 102 are
supported. And a supporting body 103. The housing 102 is composed of a base 104 in contact
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with an object (for example, a table: hereinafter referred to as a sound generation target) on
which sound is to be generated, and a cover 105 covering the base 104. A support 103 is fixed
on the upper surface of the base 104 so that the piezoelectric vibration element 101 does not
touch the housing 102. As a method of fixing the support 103 to the base 104, for example, a
method of bonding with a rubber adhesive is known (see Patent Document 1). UnexaminedJapanese-Patent No. 2003-132659
[0003]
However, in the case of the above-described sound generating device, the vibration energy
generated from the piezoelectric vibration element 101 may be absorbed by the housing. In this
case, the vibration energy is not efficiently transmitted to the sound generation target side, and
the generated volume is reduced.
[0004]
An object of the present invention is to reduce the transmission loss of vibrational energy and to
increase the generated sound volume.
[0005]
The sound generation device according to the invention of claim 1 is provided with: a
piezoelectric vibration element; a case containing the piezoelectric vibration element; and the
piezoelectric vibration element so as not to touch the case inside the case. And a support for
supporting the piezoelectric vibration element, wherein the support and the casing are bonded
by one of an adhesive of a two-component acrylic type, an epoxy type, and a one-component type
cyanone. It is characterized by
[0006]
The invention according to claim 2 is characterized in that, in the sound generator according to
claim 1, at least a portion of the housing in contact with an object to be sound-generated is made
of metal.
[0007]
The sound generation apparatus according to the invention of claim 3 includes: a piezoelectric
vibration element; a housing containing the piezoelectric vibration element; and the piezoelectric
vibration element not touching the housing inside the housing. A support for supporting the
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piezoelectric vibration element is provided, and at least a portion of the housing in contact with
an object to be sound-generated and the support are integrally formed of metal.
[0008]
According to the first aspect of the present invention, loss of transmission of vibrational energy is
achieved by bonding the support and the housing with an adhesive of any of a two-component
acrylic, epoxy, and one-component cyanone Can be reduced.
These two-component acrylic, epoxy, and one-component cyanone-based adhesives are
characterized in that they have a higher hardness at curing than rubber-based adhesives
conventionally used.
If the hardness is low, the vibration energy is absorbed accordingly, but if the hardness is high,
the transmission loss of the vibration energy is reduced because the absorption becomes difficult.
When the transmission loss is reduced in this manner, the generated volume will be increased.
According to the second aspect of the present invention, since at least a portion of the housing in
contact with the object to be acoustically generated is made of metal having a hardness higher
than that of the resin, it is possible to further reduce the transmission loss of vibration energy.
[0009]
Here, in the case of using the adhesive, the application amount of the adhesive, the adhesion
timing, and the like at the time of manufacture of the sound generating device necessarily vary
individually, which causes the variation as a product. Since the adhesive is deteriorated with time
as compared with the housing portion and the support portion, the loss of vibration energy
transmission increases with the deterioration. However, according to the third aspect of the
present invention, since at least a portion of the housing in contact with the sound generation
target and the support are integrally formed of metal, the use of the adhesive can be omitted.
Individual differences as products can be suppressed. And if an adhesive is unnecessary, since
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the time-dependent deterioration of an adhesive is eliminated, the transfer loss of vibrational
energy can be reduced over a long period of time. As a result, the productivity and reliability of
the sound generator can be enhanced.
[0010]
First Embodiment A first embodiment according to the present invention will be described below
with reference to the drawings. FIG. 1 is an exploded perspective view showing the sound
generator 1 of the first embodiment. As shown in FIG. 1, the acoustic generator 1 supports the
piezoelectric vibrating element 2 in a plate-like shape, a housing 3 incorporating the piezoelectric
vibrating element 2, and the piezoelectric vibrating element 2 inside the housing 3. And a
supporting body 4 are provided.
[0011]
An amplifier (not shown) is electrically connected to the piezoelectric vibration element 2. For
example, when an audio signal is input from an audio signal output device such as an amplifier,
the piezoelectric vibration element 2 vibrates based on the signal.
[0012]
The housing 3 is composed of, for example, a base 31 in contact with a sound generation target
such as a table, and a hollow cover 32 which covers the base 31 in combination with the base 31.
At least the base 31 of the base 31 and the cover 32 constituting the housing 3 is formed of a
metal such as aluminum.
[0013]
A notch 41 is formed in the upper portion of the support 4, and the piezoelectric vibration
element 2 is engaged with the notch 41 so that the piezoelectric vibration element 2 does not
touch the inside of the cover 32. It is disposed substantially parallel to the top surface of the. The
support 4 and the piezoelectric vibration element 2 are fixed by, for example, a one-component
cyanone adhesive or solder. Here, an adhesive layer 5 is provided between the support 4 and the
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base 31, and the support 4 and the base 31 are coupled by the adhesive layer 5. The adhesive
forming the adhesive layer 5 is, for example, any of a two-component acrylic, an epoxy, and a
one-component cyanone. Further, a notch 41 is formed in the upper portion of the support 4,
and the piezoelectric vibration element 2 is disposed substantially parallel to the upper surface of
the base 31 by engaging the piezoelectric vibration element 2 with the notch 41. Ru.
[0014]
Next, the operation of the present embodiment will be described. When an audio signal is input
from the amplifier and the piezoelectric vibration element 2 vibrates, the vibration is transmitted
to the vibration generation target through the support 4, the adhesive layer 5 and the base 31.
The vibration generation target vibrates to generate sound.
[0015]
Here, the present inventor describes the relationship between the frequency of vibration of the
piezoelectric vibration element 2 and the volume from the sound generation target based on the
vibration when the adhesive layer 5 is a one-component cyanone system, as in the prior art. The
case of the rubber adhesive was compared. FIG. 2 is a graph showing the relationship between
frequency and volume. In FIG. 2, the solid line L1 is an experimental result of the sound
generation apparatus using a one-component cyanone adhesive, and a dotted line L2 is an
experimental result of the sound generation apparatus using a rubber-based adhesive. As
apparent from FIG. 2, it can be seen that the solid line L1 exceeds the dotted line L2 at most
frequencies. In other words, the acoustic generator using the one-component cyanone adhesive
reduces the transmission loss of vibration energy and increases the generated volume compared
to the acoustic generator using the conventional rubber-based adhesive. It is
[0016]
This is because the one-component cyanone-based adhesive has a higher hardness after curing
than the rubber-based adhesive, so that it is difficult to absorb vibrational energy. The
transmission loss is similarly reduced even with a two-component acrylic or epoxy adhesive
having a higher hardness after curing than a rubber adhesive.
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[0017]
As described above, according to the sound generation device 1 of the first embodiment, the
adhesive agent of the support 4 and the base 31 is any of two-component acrylic, epoxy, and
one-component cyanone. By being coupled, transmission loss of vibration energy can be reduced.
Further, since the base 31 is formed of metal, it is possible to further reduce the transmission
loss of vibrational energy to the sound generation target.
[0018]
Second Embodiment In the first embodiment, the case where the support and the base are
bonded by an adhesive is described as an example, but in the second embodiment, the support
and The case where the base is integrally formed will be described.
[0019]
Hereinafter, a second embodiment according to the present invention will be described with
reference to the drawings.
FIG. 3 is an exploded perspective view showing the sound generator 11 of the second
embodiment. As shown in FIG. 2, the acoustic generator 11 supports the piezoelectric vibrator 12
in a plate-like shape, a housing 13 incorporating the piezoelectric vibrator 12, and the housing
13 inside thereof. Support 14 is provided.
[0020]
An amplifier (not shown) is electrically connected to the piezoelectric vibration element 12. The
piezoelectric vibration element 2 vibrates based on a signal when an audio signal is input from
the amplifier.
[0021]
The housing 13 is composed of, for example, a base 131 in contact with an acoustic generation
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target such as a table, and a hollow cover 132 which covers the base 131 in combination with
the base 131. At least the base 131 of the base 131 and the cover 132 constituting the casing 13
is formed of a metal such as aluminum.
[0022]
The support 14 is formed on the upper surface of the base 131 so as to be integral with the base
131. Specifically, the support 14 and the base 131 are castings made of metal (for example,
aluminum etc.). A notch 141 is formed in the upper portion of the support 14, and the
piezoelectric vibrator 12 is engaged with the notch 141 so that the piezoelectric vibrator 12 does
not touch the inside of the cover 132. It is disposed substantially parallel to the upper surface.
The support 4 and the piezoelectric vibration element 2 are fixed by, for example, a onecomponent cyanone adhesive or solder.
[0023]
Next, the operation of the present embodiment will be described. When an audio signal is input
from the amplifier and the piezoelectric vibration element 12 vibrates, the vibration is
transmitted to the vibration generation target via the support 14 and the base 131. The vibration
generation target vibrates to generate sound.
[0024]
As described above, according to the sound generation device 11 of the second embodiment, at
least a portion (base 131) of the housing 3 in contact with the sound generation target and the
support 14 are integrally formed of metal. Therefore, the use of the adhesive can be omitted, and
individual differences as products can be suppressed. And if an adhesive is unnecessary, since
the time-dependent deterioration of an adhesive is eliminated, the transfer loss of vibrational
energy can be reduced over a long period of time. As a result, the productivity and reliability of
the sound generator 11 can be enhanced.
[0025]
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Of course, the present invention is not limited to the above embodiment, but can be appropriately
modified. In the second embodiment, the case where the support 14 and the base 131 are
integrally cast has been described as an example, but if the support and the base are made of
metal and are integral, It is also possible to use a method other than casting.
[0026]
For example, as shown in FIG. 4, while forming the support body 143 provided with the flange
142 at the lower end, a pair of through holes communicating with the opening 144 of the flange
142 are formed in a base (not shown). The support 143 and the base may be integrally formed
by fastening a bolt through the bolt 144 and the through hole with a nut.
[0027]
Further, as shown in FIG. 5, a support 146 having a female screw 145 is formed on the lower
surface, and a pair of through holes communicating with the female screw 145 are formed on a
base (not shown) to form the through holes. The support 146 and the base may be integrally
formed by fastening a screw to the female screw 145 via the same.
[0028]
Then, as shown in FIG. 6, a recess 134 is formed in the base 133, and the support 147 is fitted in
the recess 134, thereby integrally forming the support 147 and the base 133. It is also good.
[0029]
It is a disassembled perspective view showing schematic structure of the sound generator of 1st
Embodiment.
It is a graph showing the relationship of the frequency and sound volume in the sound
generation apparatus of FIG. 1, and the conventional sound generation apparatus.
It is an exploded perspective view showing a schematic structure of a sound generator of a 2nd
embodiment.
It is a perspective view showing the modification of the support with which the sound generator
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of FIG. 3 is equipped. It is a perspective view showing the modification of the support with which
the sound generator of FIG. 3 is equipped. It is a perspective view showing the modification of
the support body and base with which the sound generator of FIG. 3 is equipped. It is a
disassembled perspective view showing schematic structure of the conventional sound
generation apparatus.
Explanation of sign
[0030]
DESCRIPTION OF SYMBOLS 1, 11 sound generator 2, 12 piezoelectric vibration element 3, 13
housing ¦ casing 4, 14 support body 5 adhesive layer 31, 131 base 32, 132 cover 41, 141 notch
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