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Piezoelectric actuator having parallel arrangement of a single piezoelectric element and a pair of displacement magnification arms

  • US 4,929,859 A
  • Filed: 12/12/1988
  • Issued: 05/29/1990
  • Est. Priority Date: 12/25/1987
  • Status: Expired due to Fees
First Claim
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1. A piezoelectric actuator comprising an output member to reciprocate along a central axis, a piezoelectric element aligned substantially along said central axis, a retainer structure supporting a first end of said piezoelectric element, a first displacement magnification mechanism having a pair of arms each having a first end and a second end and pivotably supported on said retainer structure at an intermediate portion thereof via an elastic integral hinge, said first ends of said arms each abutting a second end of said piezoelectric element opposite to said first end thereof, a second displacement magnification mechanism having a pair of links pivotably connected at first ends thereof respectively with said second ends of said arms and pivotably connected with said output member at second ends thereof opposite to said first ends thereof, a housing enclosing said retainer structure with said first displacement magnification mechanism, and means for adjustably fastening said retainer structure to said housing so that said retainer structure is adjustably shiftable relative to said housing along said central axis, wherein said housing is a substantially cylindrical housing having a longitudinal axis aligned with said central axis.

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