| 摘要 |
A method for driving an ultrasonic motor includes the step of applying a driving alternating signal to an ultrasonic vibrator to simultaneously generate two different vibration modes in the ultrasonic vibrator to cause a substantially elliptical vibration at friction-contact members of the ultrasonic vibrator, thus relatively moving the ultrasonic vibrator and a driven body in contact with the ultrasonic vibrator. A preliminary vibration domain in which a preliminary vibration smaller than the substantially elliptical vibration is generated at the friction-contact members is provided prior to a main vibration domain in which the driving alternating signal is applied.
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