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DESCRIPTION JPH05303384

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DESCRIPTION JPH05303384
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound generator using a piezoelectric vibrator.
[0002]
2. Description of the Related Art A sound generator using a piezoelectric vibrator is well known
in the prior art. The sounding body well known in the prior art has a structure in which an
acoustic conversion element formed by bonding a piezoelectric vibrator on one surface of a
diaphragm is disposed in a case formed by combining an upper case and a lower case. ing. The
upper case and the lower case are individually formed using metal or plastic and the like, and
these are combined to make one case. The acoustic conversion element is usually sandwiched
and fixed between the end faces of the upper case and the lower case in the combined process of
the upper case and the lower case.
[0003]
SUMMARY OF THE INVENTION As described above, in the conventional sounding body, the
upper case and the lower case are separate parts, and in the combined process of the upper case
and the lower case, the acoustic transducer is provided in the case. The structure for mounting
and fixing has problems such as an increase in the number of parts and an increase in the
number of assembling steps.
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[0004]
In addition, since the periphery of the diaphragm is fixed by being sandwiched between the end
faces of the upper case and the lower case, mechanical impact is applied to the piezoelectric
vibrator via the diaphragm during assembly, etc., causing damage to the piezoelectric vibrator or
There were times when cracking occurred.
Furthermore, when the periphery of the diaphragm is sandwiched and fixed between the end
faces of the upper case and the lower case, stress may be concentrated at the peripheral portion,
which may cause breakage or cracking of the piezoelectric vibrator.
[0005]
Therefore, an object of the present invention is to solve the above-mentioned conventional
problems, and to provide a sound-generating body which is small in the number of parts and the
number of assembling steps, is rich in mass productivity, and hardly causes breakage or
breakage of piezoelectric vibrator .
[0006]
Another object of the present invention is to produce the above-mentioned sounding body
without causing breakage or cracking of the piezoelectric vibrator, being rich in mass
productivity, and capable of easily adjusting the sound pressure and the sound quality. It is to
provide a manufacturing method of
[0007]
[Means for Solving the Problems] In order to solve the problems described above, the present
invention is a sound generator including an outer package, a piezoelectric vibrator, and a
diaphragm, wherein the outer package is formed of a resin molding. Each of the opposite thick
parts has a hole extending from the inside to the outside of the hollow, and the piezoelectric
vibrator is joined on the surface of the diaphragm; The diaphragm is disposed in the cavity of the
package, the periphery is embedded in and supported by the thick portion of the package, and
the cavity is divided into two in the direction of the hole.
[0008]
The manufacturing method according to the present invention for manufacturing the above-
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mentioned sounding body includes an organic matter attaching step, an outer package forming
step and an organic matter removing step, and the organic matter attaching step includes at least
the two sides of the diaphragm. In the step of attaching an organic substance so as to cover the
piezoelectric vibrator, the outer package forming step forms a resin molded body on both sides
of the piezoelectric substrate from above the organic substance, and at least on both sides of the
diaphragm. It is a process of forming a hole connected to the organic matter and opened to the
outside, and the organic matter removing process is a process of discharging the organic matter
to the outside through the hole to form a cavity.
[0009]
The package has a cavity inside, the piezoelectric vibrator is joined on the surface of the
diaphragm, the diaphragm is disposed in the cavity of the package, and the periphery is in the
thick portion of the package. Since the cavity is embedded and supported, the sound generator
can have a vibration space free from vibration disturbance.
The sheath has a hole extending from the inside to the outside of the cavity in the thick portion,
so that the sound generated with the vibration of the diaphragm can be emitted to the outside
through the hole.
[0010]
The exterior body is formed of a resin molded body, and the diaphragm is supported by being
embedded in the thick portion of the exterior body at its periphery, so that no mechanical impact
is applied to the piezoelectric vibrator at the time of assembly etc. There is no concentration of
stress at the periphery of the plate.
For this reason, breakage or breakage of the piezoelectric vibrator can be prevented.
[0011]
Since the diaphragm is embedded and supported in the thick portion of the exterior body, there
is no need for a member for supporting the piezoelectric vibrator in addition to the exterior body.
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Therefore, the number of parts can be reduced and the number of assembling steps is also
reduced.
[0012]
Since the exterior body has holes in each of the opposite thick portions, either side of the holes
can be used as the sound output side.
As a result, the installation work for various devices becomes easy.
[0013]
The exterior body is formed of a resin molded body and has a cavity inside, and the diaphragm is
disposed in the cavity of the exterior body, and the periphery is embedded and supported in the
thick portion of the exterior body Thus, it can be manufactured using an injection molding
method described later, and mass productivity improves.
[0014]
In order to obtain the above-described sounding body, first, in the organic matter attaching step,
the organic matter is attached so as to cover at least the piezoelectric vibrator on both sides of
the diaphragm.
Next, in the package forming step, a resin molded body is molded on both sides of the
piezoelectric substrate from above the organic substance, and at least on both sides of the
diaphragm, holes are formed which are connected to the organic substance and open to the
outside. The resin molded body is to be an exterior body, and can be efficiently manufactured by
a mass-producible manufacturing method such as an injection molding method.
[0015]
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Next, in the organic matter removing step, the organic matter is discharged to the outside
through the holes to form a cavity. Thereby, the cavity which comprises the space required for
vibration is formed in the inside of the resin molding which comprises an exterior body. The
resulting cavities are determined by the shape of the deposited organic matter in the organic
matter deposition process. Therefore, by controlling the shape, volume, and the like of the
attached organic matter, it is possible to control the shape, volume, and the like of the cavity, and
adjust the sound pressure, sound quality, and the like.
[0016]
In addition, the organic substance can be reliably discharged without remaining in the cavity, the
electrode deterioration of the piezoelectric vibrator due to the residual organic substance and the
variation of the vibration characteristic can be prevented, and a highly reliable sounding body
can be obtained.
[0017]
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a cross-sectional view of a sound
generator according to the present invention.
In the figure, 1 is an exterior body, 2 is a piezoelectric vibrator, and 3 is a diaphragm. 4 is a
sealing member, and 51 and 52 are lead wires.
[0018]
The exterior body 1 is formed of a resin molded body, has the cavities 11 and 12 inside, and has
holes 13 and 14 respectively connected from the inside to the outside of the cavities 11 and 12
in the opposite thick parts. The insulating resin molding is molded by means such as injection
molding. As an example of the insulating resin material which comprises the exterior body 1, ABS
resin, glass fiber reinforced plastic, etc. can be mentioned. The holes 14 are sealed by the sealing
member 4. The sealing member 4 is preferably made of the same insulating resin material as the
outer package 1. The illustration shows the case where the hole 14 is sealed by the sealing
member 4 and the hole 13 is used as a sound output hole. Conversely, the hole 13 can be sealed
by a sealing member, and the hole 14 can be used as a sound emission hole. Since the shapes and
internal volumes of the cavities 11 and 12 are closely related to the acoustic characteristics, the
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acoustic characteristics can be adjusted to adjust the sound pressure and the sound quality by
changing them. Further, among the holes 13 and 14, one used as a sound output hole, that is, in
the case shown in the drawing, the sound pressure and the sound quality can also be adjusted by
changing the diameter D1 of the hole 13.
[0019]
The piezoelectric vibrator 2 is integrally bonded on one surface of the diaphragm 3 using a
conductive adhesive or the like. The piezoelectric vibrator 2 has electrodes 22 and 23 on both
sides of a disc-like piezoelectric substrate 21. Other than the illustrated unimorph type, a
bimorph type piezoelectric vibrator can also be used.
[0020]
The diaphragm 3 is disposed inside the cavities 11 and 12 of the exterior body 1, divides the
cavities 11 and 12 into two in the direction of the holes 13 and 14, and the periphery is
embedded in the thick portion of the exterior body 1 to support It is done. The diaphragm 3 is
formed in a disk shape by a metal plate such as a brass plate. One end of the lead wire 51 is fixed
to the electrode 22 by a conductive adhesive, and the other end is led out of the exterior body 1.
One end of the lead wire 52 is fixed to the diaphragm 3 by a conductive adhesive or the like, and
the other end is led out of the exterior body 1.
[0021]
As described above, the exterior body 1 has the cavities 11 and 12 inside, the piezoelectric
vibrator 2 is joined on the surface of the diaphragm 3, and the diaphragm 3 is the cavity 11 of
the exterior body 1, Since the cavities 11 and 12 are disposed in the housing 12, the sound
generator can be obtained in which a vibration space free from vibration disturbance is secured.
Since the exterior body 1 has the holes 13 and 14 connected to the outside from the inside of the
cavities 11 and 12 in the thick part, the sound generated with the vibration of the diaphragm 3
can be emitted to the outside through the holes 13 and 14 .
[0022]
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Also, since the exterior body 1 is formed of a resin molded body, and the diaphragm 3 to which
the piezoelectric vibrator 2 is bonded is supported by being embedded in the thick portion of the
exterior body 1 at the time of assembly etc. There is no mechanical impact on the element 2 and
no stress concentration on the periphery of the diaphragm 3. For this reason, breakage or
breakage of the piezoelectric vibrator 2 can be prevented.
[0023]
Furthermore, since the diaphragm 3 is embedded and supported in the thick portion of the
exterior body 1 in addition to the exterior body, a member for supporting the piezoelectric
vibrator 2 is unnecessary. Therefore, the number of parts can be reduced and the number of
assembling steps is also reduced.
[0024]
Since the exterior body 1 has the holes 13 and 14 in each of the opposite thick portions, both
sides with the holes 13 and 14 can be used as the sound output side. As a result, the installation
work for various devices becomes easy.
[0025]
The periphery of the diaphragm 3 is embedded in and supported by the thick portion of the
exterior body 1. Therefore, in addition to the exterior body 1, a member for supporting the
piezoelectric vibrator 2 and the diaphragm 3 is unnecessary. Therefore, the number of parts can
be reduced and the number of assembling steps is also reduced.
[0026]
2 to 5 are diagrams showing manufacturing steps of the sounding body shown in FIG. 2 shows
the piezoelectric vibrator mounting step, FIG. 3 shows the organic substance attaching step, FIG.
4 shows the outer package forming step, and FIG. 5 shows the organic substance removing step.
After the piezoelectric vibrator 2 is mounted on the vibrating plate 3 as shown in FIG. 2, as
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shown in FIG. 3, in the organic matter adhering step, the organic matter 6 is at least vibrated on
both sides of the piezoelectric substrate 21. Adhere. The adhesion means is, for example,
printing. The organic substance 6 uses what can be melt | dissolved by the organic solvent.
Representative examples of such organic substances are resists, which are commercially
available.
[0027]
Next, after passing through the drying process and the like, as shown in FIG. 4, the resin molded
body 1 is molded on the both sides of the piezoelectric substrate 21 from above the organic
substance 6 by means of injection molding or the like. In this exterior body molding step, holes
13 and 14 which are continuous with the organic substance 6 and open to the outside are
formed simultaneously on at least both surface sides of the piezoelectric substrate 21.
[0028]
Next, as shown in FIG. 5, in the organic substance removing step, the organic substance 6 is
discharged to the outside through the holes 13 and 14 to form the cavities 11 and 12. In this
removal step, the organic substance 6 is selectively dissolved and discharged from the holes 13
and 14 while the whole is put in an organic solvent and washed. Thereby, the cavities 11 and 12
which constitute the space required for vibration are formed inside the resin molded body 1.
[0029]
As described above, no mechanical impact is applied to the diaphragm 3 throughout the entire
process, and no stress is concentrated on the peripheral portion of the diaphragm 3. For this
reason, breakage or breakage of the piezoelectric vibrator 2 can be prevented.
[0030]
The resulting cavities 11, 12 finally obtained through the above steps are determined by the
shape of the organic matter 6 deposited by the organic matter deposition step. The acoustic
properties are controlled by the shape, volume, etc. of the cavities 11,12. Therefore, by
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controlling the shape, volume and the like of the organic substance 6 to be attached, the shape,
volume and the like of the cavities 11 and 12 can be controlled to adjust the sound pressure, the
sound quality and the like.
[0031]
In addition, the organic substance 6 attached to form the cavities 11 and 12 is reliably
discharged through the holes 13 and 14 without remaining in the cavities 11 and 12, and the
electrode of the piezoelectric vibrator 2 by the residual organic substance It is possible to
prevent deterioration and variation in vibration characteristics. It is natural to use an organic
solvent that is suitable for dissolving the organic substance 6. Thereafter, in the sealing step, the
sealing member 4 (see FIG. 1) for closing the hole 14 is provided.
[0032]
As described above, according to the present invention, the following effects can be obtained. (A)
The exterior body has a cavity inside, the piezoelectric vibrator is joined on the surface of the
diaphragm, and the diaphragm is disposed in the cavity of the exterior body. A sounding body is
obtained that secures a vibration space that does not produce an obstacle, and the outer casing
has a hole extending from the inside to the outside of the cavity in the thick part, so the sound
generated with the vibration of the diaphragm passes through the hole It can provide a sound
generator that emits outside. (B) The exterior body is formed of a resin molded body, and the
diaphragm is supported by being embedded in the thick portion of the exterior body at its
periphery, thereby preventing breakage or cracking of the piezoelectric vibrator due to
mechanical impact or stress concentration Can provide a soundable body that can (C) Since the
diaphragm is supported by being embedded in the thick part of the exterior body at the
periphery, the number of parts and the number of assembling steps can be reduced, and a massproduced sounding body can be provided. (D) Since the exterior body has holes in each of the
opposite thick portions, the sound emission direction can be selected on both sides, and a sound
generator can be provided which facilitates the incorporation work into various devices. (E) The
manufacturing method according to the present invention includes an organic matter attaching
step, an outer package forming step and an organic matter removing step, and the organic matter
attaching step adheres the organic matter so as to cover at least the piezoelectric vibrator on
both sides of the diaphragm. In the package forming step, the resin molded body is molded on
both sides of the piezoelectric substrate from the top of the organic substance, and at least both
sides of the diaphragm are connected to the organic substance and form holes opened to the
outside. Since the organic substance removing step is a step of discharging the organic substance
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to the outside through the holes to form a cavity, the piezoelectric vibrator can be prevented
from being damaged or broken by mechanical impact or stress concentration during the
manufacturing step. In addition, it is possible to provide a method of manufacturing a sounding
body excellent in mass productivity. (F) By controlling the shape, volume, and the like of the
organic matter attached in the organic matter attaching step, it is possible to provide a
manufacturing method capable of controlling the shape, volume, and the like of the cavity to
adjust the sound pressure, sound quality, and the like. (G) Highly reliable, reliably discharging the
organic substance attached to form the cavity without leaving it in the cavity and preventing the
electrode deterioration of the piezoelectric vibrator and the variation of the vibration
characteristic due to the residual organic substance Can produce phonetic body.
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