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Piezoelectric rotation driving apparatus

  • US 5,712,524 A
  • Filed: 12/26/1995
  • Issued: 01/27/1998
  • Est. Priority Date: 12/27/1994
  • Status: Expired due to Fees
First Claim
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1. A piezoelectric rotation driving apparatus comprising at least one set of piezoelectric driving bodies,each of said piezoelectric driving bodies including:

  • an action member having an action surface contacting with a rotor, a base member connected to said action member at a fulcrum portion thereof by a first hinge, said fulcrum portion enabling said action member to move rotatively, a piezoelectric element, one end of which is connected to said action member by a second hinge, and the other end of which is connected to said base member by a third hinge, said piezoelectric element expanding by being applied with a voltage and driving said action member thereby moving said action surface rotatively;

    wherein said at least one set of the piezoelectric driving bodies is adapted integrally in the apparatus such that action surfaces of the piezoelectric driving bodies of the at least one set of driving bodies are disposed on the same line and in parallel to a central axis of said rotor and respective rotational displacement directions of said action surfaces are opposite to each other, and said action surfaces are thrust toward the central axis of said rotor by an elastic force of an elastic member.

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