Ultrasonic-motor-driving device and ultrasonic motor unit

摘要

An ultrasonic-motor-driving device is provided which allows fine adjustment of the periods of driving waves that are generated by a driving-wave-generating portion. A driving device for an ultrasonic motor includes a driving-wave-generating portion. The driving-wave-generating portion generates signals for driving piezoelectric elements included in the ultrasonic motor. The driving-wave-generating portion is constructed capable of generating rectangular waves including a plurality of rectangular waves with different periods.

主权项

1. An ultrasonic-motor-driving device comprising:
a driving-wave-generating portion that generates signals for driving piezoelectric elements, the piezoelectric elements being included in an ultrasonic motor, wherein the driving-wave-generating portion is constructed capable of generating driving waves including a plurality of driving waves with different periods, and the driving-wave-generating portion is constructed capable of cyclically generating sets of driving waves each set of which includes the plurality of driving waves with different periods, the plurality of driving waves with different periods include first and second driving waves, the second driving wave has a period different from the first driving wave, and the period of the second driving wave is longer by one clock or an integral multiple of one clock of a clock of a control portion than the period of the first driving wave.