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Brief description of the drawings
1 is a plan view of a conventional circular bimorph oscillator, FIG. 2 is a front view of the same,
FIG. 3 is a plan view showing one embodiment of the circular bimorph oscillator of the present
invention, and FIG. FIG. 5 is a sound pressure characteristic diagram of the product of the present
invention and the conventional product. 1.1 ′ ··· Piezoelectric ceramic element, 2 ··· metal
diaphragm, 4 ··· concentric grooves.