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Piezoelectric actuator with wrap-around electrode on inactive constraining layer

  • US 9,330,699 B1
  • Filed: 05/24/2015
  • Issued: 05/03/2016
  • Est. Priority Date: 03/18/2013
  • Status: Active Grant
First Claim
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1. A piezoelectric actuator assembly having a top side, a bottom side, and at least a first end, the assembly comprising:

  • a first layer comprising a single active piezoelectric layer, the first layer having a bottom face thereof;

    a first electrode disposed on the first layer;

    a second electrode having at least a bottom electrode portion disposed on the bottom face of the first layer; and

    a second layer on the first electrode, the second layer comprising a stiff material, the second layer acting as a constraining layer to constrain expansion or contraction of the first layer when the first layer is activated by application of a voltage across the first and second electrodes;

    the first electrode having a wrap-around portion that extends onto at least one of the first end of the assembly, the top side of the assembly, and the bottom side of the assembly;

    wherein the constraining layer comprises unpoled piezoelectric material.

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