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Piezoelectric transducer and electrophoretic ink display apparatus using piezoelectric transducer

  • US 20040174097A1
  • Filed: 03/19/2004
  • Published: 09/09/2004
  • Est. Priority Date: 01/29/1999
  • Status: Active Grant
First Claim
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1. A thin film piezoelectric transducer comprising a first electrode layer, a first piezoelectric film layer, a second electrode layer, a second piezoelectric film layer, and a third electrode layer formed in that order-on a substrate, wherein said first and second piezoelectric film layers are constrained so as not to expand or contract in a thickness direction.

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