Method of driving vibration actuator, drive device, and image pickup apparatus
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United States of America Patent
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Aug 11, 2020
Grant Date -
Sep 28, 2017
app pub date -
Oct 6, 2015
filing date -
Oct 10, 2014
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Abstract
A drive device for a vibration actuator, which makes it possible to perform low-speed and stable driving and expand a dynamic range of driving speed, includes first and second switching circuits, a position detection sensor, and a microprocessing unit (MPU). The first switching circuit and the second switching circuit apply a first drive signal and a second drive signal, for exciting vibration, to an electromechanical energy conversion element of a vibrating body. The position detection sensor acquires information on a relative position between the vibrating body and a driven body in press contact with each other. The MPU switches the first and second drive signals to third drive and fourth drive signals, respectively, based on the acquired information, to thereby change a position at which a highest one of peaks of amplitude of vibration excited in the vibrating body is formed.
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