ULTRASONIC MOTOR, DRIVE CONTROL SYSTEM, OPTICAL APPARATUS, AND VIBRATOR
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United States of America Patent
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Issued Date -
Jun 1, 2017
app pub date -
Nov 17, 2016
filing date -
Nov 27, 2015
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Abstract
Provided are an ultrasonic motor and a drive control system and the like using the ultrasonic motor. The ultrasonic motor includes an annular vibrator and an annular moving member arranged so as to be brought into pressure-contact with the vibrator. The vibrator includes an annular vibrating plate and an annular piezoelectric element. The piezoelectric element includes an annular piezoelectric ceramic piece, a common electrode arranged on one surface of the piezoelectric ceramic piece, and a plurality of electrodes arranged on the other surface of the piezoelectric ceramic piece. The piezoelectric ceramic piece contains lead in a content of less than 1,000 ppm. The plurality of electrodes include two drive phase electrodes, one or more non-drive phase electrodes, and one or more detection phase electrodes.
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