Patent ID: 7061156

Claim:
A control apparatus for a vibration type actuator including a contact member in press contact with a vibration member having an electro-mechanical energy conversion element, in which a driving alternating signal is applied to the electro-mechanical energy conversion element to generate driving vibration in the vibration member, thereby effecting relative movement between the vibration member and the contact member, said control apparatus comprising: a detecting circuit that detects a vibration of the vibration member and outputs a corresponding signal; a calculating circuit that calculates a phase of the driving alternating signal on the basis of the corresponding signal; and a phase shifting circuit that sets the phase of the driving alternating signal on the basis of a calculating result of said calculating circuit, wherein the corresponding signal has a phase difference with respect to the driving alternating signal, the phase difference changes in accordance with a vibration state of the vibration member, and said calculating circuit calculates the phase of the driving alternating signal on the basis of the corresponding signal and the phase difference of the corresponding signal with respect to the driving alternating signal, to counteract the driving vibration of the vibration member so as to decrease a speed of the relative movement between the vibration member and the contact member or stop the relative movement.