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Composite type acoustic transducer

  • US 4,242,541 A
  • Filed: 12/18/1978
  • Issued: 12/30/1980
  • Est. Priority Date: 12/22/1977
  • Status: Expired due to Term
First Claim
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1. A composite type acoustic transducer of a flat drive type acoustic transducer and of a piezoelectric type acoustic transducer comprising:

  • a diaphragm including a membrane made of high molecular piezoelectric material, an electrode layer applied on one surface of the membrane and a coil-like conductor applied on the other surface of the membrane;

    means for supporting the diaphragm along its edge;

    means for forming a magnetic field extending in parallel with the diaphragm and cooperating electromagnetically with the coil-like conductor;

    means for supplying an audio signal current through said coil-like conductor; and

    means for applying a voltage related to an audio signal to be reproduced across the electrode layer and the coil-like conductor.

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