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TECHNICAL FIELD The present invention relates to a piezoelectric sounding body which uses a
piezoelectric vibrator in which a piezoelectric element is bonded to a thin metal plate and is
combined with an electronic circuit and used for sounding an alarm or various alarms. is there.
The structure of the prior art and its problems The conventional piezoelectric sounding body of
this type is constructed as shown in FIG. 1 and FIG. That is, the periphery of the piezoelectric
vibrator 3 having a structure in which the piezoelectric element 2 is bonded to the thin metal
plate 1 with an adhesive is fixed to the lower surface opening of the case 4 with the adhesive.
Further, 6 and 6 are terminals for electrically connecting the piezoelectric vibrator 3 to the
outside. Now, the piezoelectric sounding body having the above-described conventional structure
has the following drawbacks. That is, if it is intended to use a piezoelectric vibrator composed of
thin metal plates having different diameters, a case matched to the diameter is required, which
increases the cost. SUMMARY OF THE INVENTION The present invention is intended to eliminate
such conventional drawbacks, and to cope with various types of piezoelectric vibrators in which
thin metal plates have different diameters, and to provide an inexpensive and inexpensive
piezoelectric sounding body. It is Configuration of the Invention In order to achieve this object, in
the piezoelectric sounding body of the present invention, at least two or more steps are provided
on a piezoelectric vibrator fixing portion formed by fixing the piezoelectric vibrator of the case
around. In this stage, at least two types of cases can be shared by being configured to be able to
correspond to thin metal plates having different diameters of piezoelectric vibrators, so that mold
costs, various management costs, and the like can be reduced. A piezoelectric speaker with a low
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
be described below with reference to the drawings of FIGS. In FIGS. 3 to 5, the same parts as
those described above are designated by the same reference numerals. In FIG. 3 to FIG. 5, steps
10. 11 are respectively provided in the lower surface openings for supporting the periphery of
the piezoelectric vibrators 8 and 9 of the case 7, and thin metal plates 12 of different diameters
are used. Each of the piezoelectric vibrators 8 and 9 which are configured as shown in FIG. In
this configuration, the case 7 having the piezoelectric oscillatory electron fixing portions
respectively corresponding to the piezoelectric vibrators 8 and 9 having a structure in which the
piezoelectric element 2 is bonded to thin metal plates 12.13 having different diameters is It
became clear that it was necessary. Further, if the number of stages is three, it can correspond to
three types of piezoelectric vibrators. Effects of the Invention As described above, according to
the piezoelectric sounding body of the present invention, it is possible to correspond to a
piezoelectric vibrator composed of thin metal plates of at least two different diameters in one
case, and case molding die cost, various management The cost and the like can be reduced, and a
low cost piezoelectric speaker can be provided.
Brief description of the drawings
1 is a cross-sectional view showing a conventional piezoelectric sounding body, FIG. 2 is a bottom
view thereof, FIG. 3 is a cross-sectional view showing an embodiment of a piezoelectric sounding
body according to the present invention, and FIG. 3 is a cross-sectional view when a piezoelectric
vibrator having a diameter different from that of FIG. 3 is adhered, and FIG. 5 is a bottom view of
2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · different
diameter of the piezoelectric vibrator 10.11.・ ・ ・ ・ ・ ・ Thin metal plates with different
diameters. Name of Agent Attorney Nakao Toshio Other 1 person Figure 1 Figure 3
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