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Vacuum stressed polymer film piezoelectric transducer

  • US 4,064,375 A
  • Filed: 08/11/1976
  • Issued: 12/20/1977
  • Est. Priority Date: 08/11/1975
  • Status: Expired due to Term
First Claim
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1. An electro-acoustic transducer of the type having a vibratable diaphragm made of a film polymer having piezo-electric properties,means stressing said diaphragm to a curved shape in cross-section, andelectrodes on each face of said diaphragm,the improvement wherein,there are means supporting the periphery of said diaphragm, said means being incorporated in part of an enclosure sealing one face of said diaphragm from the atmosphere, andstressing of said diaphragm to a curved shape is obtained by evacuation of said enclosure.

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