Patent attributes
A drive apparatus for an ultrasonic motor is provided wherein a diphase alternating drive signal having a predetermined phase difference and a predetermined drive frequency is applied to an ultrasonic vibrator equipped with a driver to be in contact with a driven member, such that longitudinal vibration and bending vibration are simultaneously generated in the ultrasonic vibrator to generate elliptical vibration, and drive force is obtained from the elliptical vibration to drive the driven member by the ultrasonic vibrator. The drive apparatus for the ultrasonic motor includes drive unit for generating the alternating drive signal and applying the alternating drive signal to the vibrator to drive the driven member, and burst drive unit for performing burst drive by applying, to the vibrator, a burst signal to inhibit residual vibration in the driven member after the driving of the driven member by the drive unit has been stopped.
