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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view showing the support structure of
the piezoelectric buzzer unit of the conventional structure, FIG. 2 is a side view showing the same
part in cross section, and FIG. 3 is a piezoelectric buzzer unit according to the present invention
FIG. 4 is a top view showing one embodiment of the present invention, FIG. 4 is a perspective
view seen from below of the metal resonance plate constituting the unit, and FIG. 5 is a side view
showing a part of the support structure of the unit in cross section. FIG. 1 ...... piezoelectric
ceramic element, 2 ...... metal resonant plate, 4 ...... projections, a ...... resonance clause circle.
DETAILED DESCRIPTION OF THE INVENTION C. The present invention relates to a piezoelectric
buzzer 71F4-unit using a resonance plate made of an M * metal and having a protruding point
also on a circle having the same dimensions as the resonance node circle. b27 Generally, the
piezoelectric buzzer unit of this ridge has a structure in which a circular piezoelectric ceramic
rope 2 is bonded to a metal-made resonance plate 2 with a flat plate-like circular shape as shown
in FIGS. 1 and 2 with an adhesive or the like. At the time of pregnancy, it exhibits a resonant
vibration displacement like b. Therefore, in practice, when using as a sounding body, the
resonance node circle a must be supported, so that the co-image node circle d and the
corresponding ← ′ ′-one ′ ′-′ ′, “Ridon '2”,・ Do the same circle on the projection
support point 3! Need a support part 3 having a plurality of. In this case, the resonance plate 2 is
supported on the protrusion support point al by means such as adhesion. SUMMARY OF THE
INVENTION The present invention is intended to provide a piezoelectric buzzer unit that can be
easily supported without using complicated support parts as in the prior art. In the following, one
embodiment of the present invention will be described with reference to FIGS. The present
invention is characterized in that a metal resonance plate 2 having three or more protrusions 4
on a resonance node circle a as shown in the figure is used. Therefore, since the metal resonance
plate 21 has supporting points, it only needs to be supported on the supporting part 6 having a
flat surface. As described above, the present invention is configured, and since the piezoelectric
buzzer unit itself has a support point, the piezoelectric buzzer does not require a complicated
support part having a conventional protrusion support point. Simple support of the unit can be
achieved. Note that the same effect can be obtained by providing an annular protrusion instead
of providing a protrusion of three or more points on the metal resonance plate.
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