Electronic apparatus with ultrasonic motor.

摘要

An electronic apparatus which is equipped with an ultrasonic motor (221, 222, 223) and which consumes only a small amount of electric power, is stable in performance, and is capable of accurately controlling the angular position is described. An environment detection means (231) detects the environment such as the rotation of the moving member (222) of the motor, the voltage of the power supply (201) or the temperature. Driving pulses corresponding to the environment are stored in a driving pulse storage circuit (205). Similarly stopping pulses may be stored in a stopping pulse storage circuit (210). An output pulse selecting circuit (207) provides output pulses to drive the ultrasonic motor in dependence upon the detected environment by selecting the appropriate driving pulses or possibly stopping pulses. <IMAGE>