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Variable acoustic wave energy transfer-characteristic control device

  • US 4,096,756 A
  • Filed: 07/05/1977
  • Issued: 06/27/1978
  • Est. Priority Date: 07/05/1977
  • Status: Expired due to Term
First Claim
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1. A variable acoustic wave energy transfer characteristic control device including:

  • a piezoelectric unit comprising a plurality of contiguous layers of piezoelectric material which define two outer faces and define an interface between each pair of adjacent ones of said contiguous layers, each of said layers having a respective specified thickness, first and second electrodes respectively at said outer faces, and at least one additional electrode at each interface;

    an electrical circuit connected across said first and second electrodes; and

    switch means for selectively connecting said at least one additional electrode to another one of said electrodes which selectively short circuits at least a portion of at least one of said layers of said piezoelectric element.

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