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DESCRIPTION JPH11178094

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DESCRIPTION JPH11178094
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric receiving unit such as a telephone which converts a voltage signal into an audio
signal.
[0002]
2. Description of the Related Art As a conventional piezoelectric receiving unit, one disclosed in
Japanese Patent Application Laid-Open No. 6-86388 shown in FIG. 5 is known. That is, the
adhesive 5 is applied to the holding step 3 portion of the exhaust chamber case 4 provided with
a plurality of fine circular acoustic resistance holes 1 on the bottom and the holding step 3 on
the inner side wall of the piezoelectric diaphragm 2 The outer periphery of the piezoelectric
diaphragm 2 is overlapped on the surface, and the front air chamber case 7 having the sound
release hole 6 in the center part is inserted from above, and the outer peripheral part of the
piezoelectric diaphragm 2 is fixed.
[0003]
In this configuration, the adjustment for obtaining a desired sound pressure-frequency
characteristic is performed by changing the number of the acoustic resistance holes 1 formed in
the exhaust chamber case 4 and the opening area size.
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1
[0004]
The front air chamber case 7 and the exhaust chamber case 4 of the piezoelectric receiving unit
are made by injection molding of a polymer resin, but the molding die of the exhaust chamber
case 4 is fine. In addition, in order to obtain the acoustic resistance hole 1 having a high aperture
diameter, high-precision processing of the mold pin is required, and the manufacturing cost
becomes expensive.
In addition, the mold pin of the acoustic resistance hole 1 is frequently broken during the
injection molding, and the wear is severe and it is difficult to maintain the accuracy.
[0005]
An object of the present invention is to inexpensively provide a high-quality piezoelectric
receiving unit formed of an exhaust chamber case having an acoustic resistance hole with high
accuracy and stable shape and size, without the above-mentioned conventional defects.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, there is provided a front air chamber case provided with a sound emission hole at the
center and an exhaust chamber case provided with a cruciform acoustic resistance hole at the
center. The piezoelectric diaphragm is housed between the two, and the opening area of the
acoustic resistance hole is made wider as it goes to the inside of the exhaust chamber case, and
narrowed as it goes to the outlet side, and the cross section thereof is trapezoidal. While reducing
the manufacturing cost of the molding die, an exhaust chamber case having acoustic resistance
holes of stable shape and size can be obtained, and it becomes possible to inexpensively provide
a piezoelectric receiving unit excellent in sound pressure-frequency characteristics. .
In addition, it is possible to easily obtain a piezoelectric receiving unit having desired sound
pressure-frequency characteristics by adjusting the ratio of the opening area ratio of the acoustic
resistance hole on the inside to the outside of the exhaust chamber case.
[0007]
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According to a first aspect of the present invention, there is provided a front air chamber case
having a sound emission hole at a central portion, an exhaust chamber case having an acoustic
resistance hole at a central portion, and the front air chamber. In a piezoelectric receiving unit
including a piezoelectric vibrator plate fixedly held between a case and an exhaust chamber case,
the shape of the acoustic resistance hole is cruciform, and the opening area is wide toward the
outlet side of the exhaust chamber case. It is a piezoelectric receiving unit characterized by using
an exhaust chamber case which is narrowed as it goes and whose cross-sectional shape is
trapezoidal, and by making the acoustic resistance holes cruciform, the sound of the molding die
of the exhaust chamber case The pins of the resistance hole can be integrated into one of the
central portions of the exhaust chamber case. As a result, the cross-sectional area of the pin
increases and the strength also increases, and the processing of the molding die becomes easy,
and the manufacturing cost can be significantly reduced. Furthermore, the exhaust chamber case
having a stable shape and shape of the acoustic resistance hole You can get
[0008]
Embodiment 1 Hereinafter, an embodiment of the present invention will be described.
[0009]
1 is an exploded perspective view of a piezoelectric receiving unit according to an embodiment of
the present invention, FIG. 2 is a sectional view, FIG. 3 is an enlarged perspective view of an
acoustic resistance hole provided on the bottom of an exhaust chamber case, FIG. A crosssectional view of the hole is shown.
In the figure, 11 is a front air chamber case, 12 is a sound emission hole, 13 is a front air
chamber, 14 is an exhaust chamber case, 15 is an acoustic resistance hole, 16 is an exhaust
chamber, 17 is a piezoelectric diaphragm, 18 is a lead wire, The reference numeral 19 denotes
an adhesive, and the reference numeral 20 denotes a step for holding the piezoelectric
diaphragm 17.
[0010]
First, the adhesive 19 is applied to the surface of the holding step 20 of the exhaust chamber
case 14. Next, the outer peripheral portion of the piezoelectric diaphragm 17 is superimposed on
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the surface of the adhesive 19. Next, the outer peripheral portion of the piezoelectric diaphragm
17 is fixed and held by the front air chamber case 11 and the exhaust chamber case 14, and the
front air chamber 13 is formed above the piezoelectric diaphragm 17 and the exhaust chamber
16 is formed below it. Is completed. The exhaust chamber case 14 is provided with a cruciform
acoustic resistance hole 15 as shown in FIG. 3 on its bottom surface, and the cross section of the
exhaust chamber case 14 has a wide inside opening width of the exhaust chamber case 14 as
shown in FIG. It used the thing made into the trapezoid which became narrow as it went.
[0011]
In the completed piezoelectric receiving unit, when a voltage signal is applied to the piezoelectric
diaphragm 17 through the lead wire 18, the piezoelectric diaphragm 17 resonates to vibrate the
air in the front air chamber case 11 and the exhaust chamber case 14 to be released. Sound
waves are emitted from the sound hole 12 and the acoustic resistance hole 15. At this time, the
acoustic resistance hole 15 formed for the purpose of obtaining a predetermined sound pressurefrequency characteristic widens the opening width on the inner side of the exhaust chamber case
14 and narrows as it goes to the outer side, and has a trapezoidal cross section. The flow of air
discharged from the exhaust chamber case 14 through the acoustic resistance hole 15 becomes
smooth, and the amount of air proportional to the amplitude of the piezoelectric diaphragm 17 is
discharged without resistance, and as a result, excellent sound pressure-frequency A piezoelectric
receiver unit having characteristics is obtained. Further, the pins for the acoustic resistance holes
15 of the mold of the exhaust chamber case 14 also have higher strength than a plurality of fine
pins forming the acoustic resistance holes 1 of the conventional example, and the wear and
breakage of the pins can be prevented. An exhaust chamber case 14 having a stable shape and
size of the acoustic resistance hole 15 is obtained. Further, the processing of the pins of the
molding die is facilitated, and the manufacturing cost can be significantly reduced.
[0012]
In order to obtain the desired sound pressure-frequency characteristics, cruciform acoustic
resistance holes 15 having different opening areas on the inside and the outside of the exhaust
chamber case 14 are provided at the center of the bottom of the exhaust chamber case 14.
Depending on the type, it may be shaped like *.
[0013]
According to the present invention, according to the present invention, the cross-section is
formed in the center of the bottom of the exhaust chamber case in a cruciform manner, and the
opening area is made wider toward the inside of the exhaust chamber case and narrower toward
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the outside. By using the one in which the acoustic resistance hole is formed, it is possible to
inexpensively provide a piezoelectric receiving unit excellent in sound pressure-frequency
characteristics, and also to reduce the manufacturing cost of the mold for the exhaust chamber
case. Become.
[0014]
Brief description of the drawings
[0015]
1 is an exploded perspective view of a piezoelectric receiving unit according to an embodiment of
the present invention
[0016]
Fig. 2 same, sectional view of the piezoelectric receiving unit
[0017]
Fig. 3 same, enlarged perspective view of the acoustic resistance hole formed in the exhaust
chamber case
[0018]
Fig. 4 same, sectional view of the acoustic resistance hole formed in the exhaust chamber case
[0019]
Fig. 5 An exploded perspective view of the conventional piezoelectric receiving unit
[0020]
Explanation of sign
[0021]
11 front air chamber case 12 sound emission hole 13 front air chamber 14 exhaust chamber
case 15 acoustic resistance hole 16 exhaust chamber 17 piezoelectric diaphragm 18 lead wire
19 adhesive 20 holding step
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