Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1994-03-11
1995-07-11
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310337, 310357, H01L 4108
Patent
active
054323967
ABSTRACT:
A wave-receiving piezoelectric device for use as, e.g., a hydrophone or a microphone, is constituted by a piezoelectric body having two surfaces sandwiching a thickness and including at least one surface provided with a recess (including a perforation communicating with the two surfaces) set in the thickness direction, and a rigid member 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 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.
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patent: 4384231 (1983-05-01), Ishikawa et al.
patent: 5003516 (1991-03-01), Sato et al.
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patent: 5297553 (1994-03-01), Sliwa et al.
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Moriyama Nobuhiro
Nakamura Ken'ichi
Sato Takashi
Suzuki Kazuyuki
Dougherty Thomas M.
Kureha Kagaku Kogyo Kabushiki Kaisha
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