Patent ID: 6177753
Filing Date: 2001-01-23
Classification: H02N

Abstract:
A vibration type drive device, comprising:an elastic member;a driving electro-mechanical energy conversion element portion having at least two driving electro-mechanical energy conversion elements, and arranged on said elastic member;a detection electro-mechanical energy conversion element portion electrically connected to said driving electro-mechanical energy conversion element;a driving circuit that applies driving frequency signals having different phases from each other to said at least two driving electro-mechanical energy conversion elements; anda cancel circuit, connected to an output of said detection electro-mechanical energy conversion element portion, and including means for cancelling a driving frequency signal component included in the output of the detection electro-mechanical energy conversion element portion and for extracting from the output of the detection electro-mechanical energy conversion element portion a component generated by vibration due to the driving frequency signal.