Patent ID: 6335585
Filing Date: 2002-01-01
Classification: G03G,H02N,H02P

Abstract:
A controller which controls a vibration wave motor, the vibration wave motor including an electrical-to-mechanical energy converting element mounted on a vibrator, said controller applying a driving frequency signal to the electrical-to-mechanical converting element to produce driving power in the vibration wave motor, said controller comprising:a signal forming circuit which forms the driving frequency signal; and a mode setting circuit that selectively sets said signal forming circuit in a first mode, in which said signal forming circuit generates a driving frequency signal having a frequency and voltage sufficient to normally drive said vibration motor, and, in response to an irregular stop of the vibration wave motor, in a second mode, in which said signal forming circuit generates a driving frequency signal having a frequency or voltage insufficient to start rotation of the vibration wave motor, but sufficient to permit manual rotation of the vibration wave motor.