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JPS5816698

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DESCRIPTION JPS5816698
[0001]
Brief description of the drawings
[0002]
FIG. 1 is a plan view showing a sounding plate of a conventional piezoelectric buzzer. FIG. 2 is a
cross-sectional view showing a piezoelectric buzzer using the sound generation plate of FIG. FIG.
3 is a view showing an example of a drive circuit of the piezoelectric buzzer of FIG. FIG. 4 is a
view for explaining the vibration mode of the piezoelectric buzzer as shown in FIG. FIG. 5 is a
graph showing frequency characteristics of a feedback voltage generated in the feedback
electrode 5 when the sound generation plate 1 of FIGS. 1 and 2 is excited by white noise. FIG. 6 is
a plan view of a tone generating plate showing an embodiment of the present invention. FIG. 7 is
a graph showing the frequency characteristics of the feedback voltage when the sound
generation 100 of FIG. 6 is excited under substantially the same conditions as FIG. In the figure,
1 and 100 indicate a sound generation plate, 2 indicates a diaphragm, 3 indicates a piezoelectric
plate, 40 indicates a main electrode, and 50 indicates a feedback electrode.
04-05-2019
1
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