Ultrasonic motor and electronic apparatus having an ultrasonic motor

摘要

An ultrasonic motor including an oscillation drive circuit for generating an oscillation wave by self-excited oscillation by an oscillator 101 bonded with a piezoelectric element 102 and start/stop signal generating means for generating a signal of controlling start/stop of the ultrasonic motor by bringing the oscillation drive circuit 405 into an active state / stop state in which the oscillation drive circuit 405 includes a power amplifier for amplifying an excitation signal, a capacitive circuit for adjusting a frequency of the excitation signal and a switching circuit connected to a capacitive element constituting the capacitive circuit for shortcircuiting terminals of the capacitive element based on an output signal from the start/stop signal generating means. <IMAGE>