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DESCRIPTION JPH05268698

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DESCRIPTION JPH05268698
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric handset for use in a handset such as a telephone or an interphone.
[0002]
2. Description of the Related Art A conventional piezoelectric receiver will be described with
reference to FIG. In FIG. 3, reference numeral 12 denotes a piezoelectric ceramic plate which is
bonded to a metal substrate 11 and connected to lead wires 18 taken out to the outside to form a
piezoelectric diaphragm. The piezoelectric diaphragm includes an acoustic resistance member 17
which damps the vibration of the piezoelectric diaphragm and flattens the frequency
characteristic via the shock absorbing material 19 in the front case 13 provided with the sound
emission hole 14 and the inner surface of the leak hole 16 The peripheral edge portion of the
rear case 15 is held and connected by the rear case 15 connected to the rear side.
[0003]
However, in the above-described conventional configuration, when the piezoelectric diaphragm
vibrates, the front case 13 and the rear case 15 resonate to cause a problem that the
characteristics are deteriorated. The frequency characteristic of such a conventional piezoelectric
receiver is shown in FIG.
17-04-2019
1
[0004]
The present invention solves the above-mentioned conventional problems, and an object of the
present invention is to provide a piezoelectric receiver in which the resonance of the front case
and the back case is prevented when the piezoelectric diaphragm vibrates, and the sound quality
is improved. is there.
[0005]
SUMMARY OF THE INVENTION In order to solve this problem, a piezoelectric receiver according
to the present invention has a structure in which a damping and soundproof coating is applied to
the outer surfaces of a front case and a rear case.
[0006]
With this configuration, the resonance of the front case and the rear case generated when the
piezoelectric diaphragm vibrates is attenuated by the viscous effect of the damping sound-proof
paint, and a piezoelectric receiver having excellent frequency characteristics can be obtained. it
can.
[0007]
An embodiment of the present invention will be described below with reference to FIG.
FIG. 1 is a cross-sectional view showing a piezoelectric receiver according to the present
invention. In FIG. 1, reference numeral 12 denotes a piezoelectric ceramic plate which is bonded
to a metal substrate 11 and connected to lead wires 18 taken out to form a piezoelectric
diaphragm. ing.
[0008]
The piezoelectric diaphragm includes an acoustic resistance member 17 which damps the
vibration of the piezoelectric diaphragm and flattens the frequency characteristic via the shock
absorbing material 19 in the front case 13 provided with the sound emission hole 14 and the
inner surface of the leak hole 16 The peripheral portion is pinched and coupled by the rear case
17-04-2019
2
15 coupled to the.
Further, the damping sound-proofing paint 20 is applied to the outer surface of the front case 13
and the rear case 15 excluding the sound release hole 14 and the leak port 16.
[0009]
The damping soundproofing paint 20 (trade name ... damping soundproofing paint V coat R #
200 V, manufactured by Shinto Paint Co., Ltd.) contains a polyester resin as a binder resin having
a viscosity effect, and additionally, a special filler, a sauce It is made of an additive, solvent, etc.,
and can be damped by applying it to a film thickness of about 200 to 300μ. The resonance of
the front case 13 and the back case 15 generated by the vibration of the piezoelectric diaphragm
can be used practically. It is possible to attenuate to a level that does not cause any problems.
[0010]
The frequency characteristics of the piezoelectric receiver whose characteristics are improved by
damping the resonance in this way are shown in FIG.
Compared with the frequency characteristics of the conventional piezoelectric receiver described
in the above-mentioned prior art and shown in FIG. 4 from the frequency characteristics of FIG.
2, unnecessary peak dips in the midrange are improved and distortion is eliminated. I
understand.
[0011]
As described above, according to the present invention, by applying the damping and
soundproofing paint to the outer surface of the front case and the rear case, the resonance
caused by the front case and the rear case generated when the piezoelectric diaphragm vibrates.
Can provide an excellent piezoelectric handset with improved sound quality.
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3
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