JPS59164397

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DESCRIPTION JPS59164397
[0001]
Brief description of the drawings
[0002]
FIG. 1 is a side view of a conventional preamplifier built-in type receiver, FIG. 2 is a graph
showing the distance between the piezoelectric and the preamplifier housing in the conventional
example and the present invention, and FIG. FIG. 4 is a side view of a preamplifier built-in type
receiver showing one embodiment, and FIG. 4 is a circle graph showing the directivity of the
receiver according to the present invention. 1 ········ Piezoelectric, 2 ········· Preamplifier housing, 3 ···
Curved molding material, 4 ··· Curved cable. ど
1−Lニ±「
04-05-2019
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