Pre-loaded actuator using piezoelectric element
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United States of America Patent
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Apr 27, 1993
Issued Date -
N/A
app pub date -
Jul 30, 1991
filing date -
May 12, 1989
priority date (Note) -
Expired
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Abstract
Pre-loaded piezoelectric actuators provide improved work piece displacement, frequency of repetition, accuracy and repeatability. Actuators may use a coil spring providing a compressive force adequate to substantially fully compress a laminated piezoelectric element on a non-destructive basis. Upon activation, a pre-loaded actuator delivers a full workpiece drive stroke because piezoelectric element axial compression has previously occurred. Pre-loading methods and pre-loading to damp out element oscillation are also disclosed.
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