Ultrasonic motor
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United States of America Patent
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-
Aug 8, 1995
Grant Date -
N/A
app pub date -
Sep 22, 1993
filing date -
Sep 25, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An ultrasonic motor comprising a vibrator for generating ultrasonic vibration, an electric-mechanical energy conversion element provided at node positions of the ultrasonic vibration, for generating ultrasonic vibration on the vibrator, the vibrator having an end face thereof which is inclined with respect to a central axis of the vibrator being rotatably driven by electric energy applied to the electric-mechanical energy conversion element, a plurality of displacement enlarging vibration pieces which are formed axially on the end face of the ultrasonic vibrator and in which grooves concentric with an outer periphery are arranged respectively at the node positions of the vibration, the displacement enlarging vibrating piece having a taper, and an element to be driven urged against end faces of the displacement enlarging vibration pieces by urging means and moved in a predetermined direction.
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