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Stretched piezopolymer transducer with unsupported areas

  • US 4,558,249 A
  • Filed: 03/12/1984
  • Issued: 12/10/1985
  • Est. Priority Date: 03/10/1980
  • Status: Expired due to Term
First Claim
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1. A transducer, comprising:

  • a piezoelectric membrane including a laminar sheet composed of a piezoelectric material and a pair of conductive electrodes coating the sheet and sandwiching the sheet between them;

    said membrane have two surfaces, an edge portion, and a central portion;

    support means for supporting said membrane and electrically contacting said membrane at the electrodes;

    said support means including a frame for holding the membrane at the edge portion;

    said supporting means including a holding structure contacting the membrane at the center portion;

    said holding structure contacting said membrane over a first area of the central portion and leaving a larger second area of the central portion of the membrane unsupported;

    said holding structure being rigid, andsaid frame having means for stretching the membrane over the rigid holding structure so as to give the unsupported portion a curved shape.

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