Wave-receiving piezoelectric device.

摘要

A wave-receiving piezoelectric device (10) for use as, e.g., a hydrophone or a microphone, is constituted by a piezoelectric body (1) having two surfaces (1a,1b) sandwiching a thickness (t) and including at least one surface provided with a recess (including a perforation (4) communicating with the two surfaces) set in the thickness direction, and a rigid member (2,3) having a contact surface and an outer surface opposite to the contact surface and disposed to cover said at least one surface with the contact surface so as to make the recess (4) airtight. As a result, an acoustic pressure received by the outer surface is concentrated and applied onto said at least one surface of the piezoelectric body, thereby giving an improved wave-receiving sensitivity at an enhanced acoustic pressure.