Acoustic transducer
First Claim
Patent Images
1. An acoustic transducer, comprising:
- a rigid inert cylindrical member having inner and outer wall surfaces;
a flexible inert mandrel having opposite upset end portions;
an active transducer element formed from a piezoelectric film strip wrapped a plurality of times around said inert mandrel; and
means for sealingly securing said opposite upset end portions of said flexible inert mandrel to the inner surface of said rigid inert cylindrical member.
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Accused Products
Abstract
A piezoelectric film strip is wrapped a plurality of times around a flexible inert mandrel that has standoff collars on each end. The film-wrapped mandrel is hermetically sealed inside a hollow rigid inert cylinder. Electrodes provide electrical communication with the film strip which forms the active element of the transducer. Variations in hydrodynamic pressure flex the film strip in tension to generate a voltage.
50 Citations
10 Claims
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1. An acoustic transducer, comprising:
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a rigid inert cylindrical member having inner and outer wall surfaces; a flexible inert mandrel having opposite upset end portions; an active transducer element formed from a piezoelectric film strip wrapped a plurality of times around said inert mandrel; and means for sealingly securing said opposite upset end portions of said flexible inert mandrel to the inner surface of said rigid inert cylindrical member. - View Dependent Claims (2, 3, 4, 5)
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6. An acoustic transducer, comprising:
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a rigid inert hollow cylinder; a flexible inert mandrel having a raised boss at each end thereof; a plurality of turns of a piezoelectric film strip wrapped around said flexible mandrel between said raised bosses; and means for hermetically sealing the respective raised bosses to the interior of said hollow cylinder. - View Dependent Claims (7, 8, 9, 10)
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Specification