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DESCRIPTION JPS599696

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DESCRIPTION JPS599696
[0001]
Brief description of the drawings
[0002]
FIG. 1 is a cross-sectional view showing one embodiment of the ultrasonic ceramic microphone of
the present invention, and FIG. 2 is a cross-sectional view of another embodiment of the
ultrasonic ceramic microphone of the present invention. The characteristics of the microphone
and the conventional microphone were compared, where a represents the sensitivity frequency
characteristics and b represents the directivity characteristics. The solid line shows the
characteristics of the microphone of the present invention, and the dotted line shows the
characteristics of the conventional microphone. FIG. 4 is a cross-sectional view of a conventional
ultrasonic ceramic microphone. 1 ... cylindrical case, la, 10a ... internal ceiling surface, 2 ...
piezoelectric ceramic vibrator, 3 ... protective case, 3a ... both. Sounding part, 4 ... flange part, 5 ...
elastic member, 6 ... terminal board, 7.13 ... metal base, 8, 8 '... terminal, 9, 9' ... lead Wire, 10:
frusto-conical case 11, 11: protective case, 12: inner ring, 14: resin part.
13-04-2019
1
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