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DESCRIPTION JPH02214296

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DESCRIPTION JPH02214296
[0001]
FIELD OF THE INVENTION The present invention relates to a piezoelectric handset for use in a
telephone set or an interphone handset. Prior Art A conventional piezoelectric receiver has a
structure shown in FIGS. That is, the front case 6 and the back case 7 sandwich the front and
back of the piezoelectric diaphragm in which the piezoelectric ceramic plate 3 is bonded to the
metal substrate 1. Further, an acoustic resistance material 8 is fixed to the rear case 6 to flatten
the frequency characteristics. Further, as shown in FIG. 3, lead wires 9a are connected to the
metal substrate 1 of the piezoelectric diaphragm and lead wires 9b are connected to the
piezoelectric ceramic plate 3, respectively. Problems to be Solved by the Invention In such a
conventional configuration, since there are also two lead wires 9a and 9b, it takes time and effort
to connect them, and the cost becomes high. Furthermore, the incorporation of a piezoelectric
receiver into a handset etc. In the case of trying to automate, if there are two lead wires 9a and
9b, their positions can not be determined and there is a problem that automation can not be
performed. The present invention is intended to solve such problems, and it is an object of the
present invention to simplify lead wire connection work and reduce costs, and further to be able
to cope with automation of incorporating a piezoelectric receiver into a handset or the like. is
there. Means for Solving the Problems In order to solve the problems, the present invention
provides a tongue piece extended to the outside of the peripheral portion of the front case and
the rear case on a part of the peripheral portion of the metal substrate to form one external
conductive portion The lead wire connected to the surface electrode of the piezoelectric ceramic
plate is extended outside the periphery of the front case and the back case to form the other
external conductive portion. Operation With this configuration, one lead wire connection point
reduces the working time and halves the cost. Furthermore, since only one lead wire is used,
positioning of the external conductive portion with respect to the piezoelectric receiver can be
easily performed, and automatic assembly is achieved. It is possible to cope with Embodiment 1
13-04-2019
1
FIG. 1 is a structural view of a piezoelectric diaphragm used in a piezoelectric receiver according
to an embodiment of the present invention. In FIG. 1, 1 is a metal substrate, and a tongue 2
extends from a part thereof Further, a lead wire 4 sandwiched by an insulator 5 is connected to
the piezoelectric ceramic plate 3 bonded to the metal substrate 1. FIG. 2 is a cross-sectional view
of a piezoelectric receiver according to an embodiment of the present invention. As shown in FIG.
2, the outer periphery of the piezoelectric diaphragm is sandwiched from the front and back by
front case 6 and back case 7 An acoustic resistance material 8 is fixed to the inner surface of the
case 7 to flatten the frequency characteristics. In the present embodiment, the extension
directions of the tongue piece 2 and the lead wire 4 are the same direction, and it is preferable
for automation to extend in the same direction in this manner.
Effects of the Invention As described above, according to the present invention, since there are
only one connection point of the lead wire, the connection work can be simplified and the cost
can be reduced, and furthermore, the position of the tongue piece from the metal substrate is
determined. As a result, there is an effect that it is possible to cope with automatic assembly to a
handset.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a plan view of a piezoelectric diaphragm used in a piezoelectric receiver according to an
embodiment of the present invention, FIG. 2 is a sectional view of a piezoelectric receiver
according to an embodiment of the present invention, and FIG. 3 is used in a conventional
piezoelectric receiver FIG. 4 is a cross-sectional view of a conventional piezoelectric receiver.
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и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и front face case, 7 ... ... back case.
Name of agent Attorney Attorney Shigetaka Hino and one other person Figure 1 Figure 2
13-04-2019
2
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