Vibration type actuator, optical device, and image pickup apparatus
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United States of America Patent
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Mar 6, 2018
Issued Date -
N/A
app pub date -
Sep 9, 2015
filing date -
Sep 19, 2014
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Abstract
An ultrasonic motor includes a vibrator to which a piezoelectric element is fixed and a friction member having a frictional contact surface in contact with the vibrator. A pressurizing member pressurizes the vibrator toward the friction member using a resilient force of a coil spring. A pressurizing force setting unit transmits a driving force of a pressurizing force setting motor to a holding member and then sets the pressurizing force by altering an amount of deflection of the coil spring depending on the relative position of the holding member with respect to the pressurizing member. The friction member is driven relative to the vibrator by an elliptic vibration of the vibrator in a state where the projections provided on a vibration plate are brought into pressurized contact with the frictional contact surface of the friction member by the pressurizing force.
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