Patent ID: 6954022
Filing Date: 2005-10-11
Classification: H02N

Abstract:
1. A control device for a vibration-type actuator having an elastic member fixed with an electro-mechanical energy conversion element, and a vibration member that generates a vibration on a surface of the elastic member by supplying a drive signal to the electro-mechanical conversion element, the control device comprising: a drive circuit that supplies a periodic signal to the electro-mechanical energy conversion element; a state detecting circuit that detects a drive state of the vibration member and outputs a waveform signal representing the detected drive state; an inclination detecting circuit that detects an inclination of at least one of a rising region and a falling region of a waveform at a predetermined level defined in accordance with an amplitude of the waveform signal; and a control circuit that controls the drive circuit on the basis of an unput signal from the inclination detecting circuit.