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Embedded piezoelectric structure and control

  • US 4,849,668 A
  • Filed: 05/19/1987
  • Issued: 07/18/1989
  • Est. Priority Date: 05/19/1987
  • Status: Expired due to Term
First Claim
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1. A structure formed of plies of conductive composite material which is assembled and then hardened by curing at elevated temperature or pressure, such structure comprising an assembly ofplural plies of conductive composite structural material arranged to form a body of said structure, at least one ply including a coupling face,a piezoelectric element incorporated within said body and having an electrically actuable surface bounded by said coupling face, anda film formed of electrically insulative sheet material located between the electrically actuable surface of said element and the coupling face for electrically insulating the surface from the conductive composite, said film being cemented to said electrically actuable surface with a cement which hardens during the curing of said plies of composite structural material to provide a mechanical shear coupling for the transmission of shear forces between the piezoelectric element and the coupling face, whereby said cured assembly forms a conductive structure of substantially homogeneous mechanical properties with a piezoelectric element effectively coupled to apply strain to the coupling face without shorting.

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