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DESCRIPTION JPS59166599

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DESCRIPTION JPS59166599
[0001]
Brief description of the drawings
[0002]
FIG. 1 shows an ultrasonic microphone according to the present invention, where A is a plan view
with a partial cross section, B is a front elevational view in cross section, FIG. 2 is a partial
sectional view of foamable plastic constituting the case of the present invention Fig. A shows the
case of using metal as the case material, Fig. B shows the ultrasonic pulse characteristics when
using plastic, and Fig. 4 shows the case where the bottom of the case is stepped (dotted line) and
when it is not performed 5A to 5C are principal part sectional views according to the other side
of the present invention. 1 · · · · · · Case made of foamable plastic, 1a · · · · · · Case bottom surface
1b · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Piezoelectric element.
17-04-2019
1
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