Patent ID: 6037701
Filing Date: 2000-03-14
Classification: H02N

Abstract:
A vibration type actuator device or an apparatus having the device, wherein an electro-mechanical energy conversion element is disposed at an elastic member, and a cyclic signal is applied to the energy conversion element to excite a vibration in the elastic member, thereby to generate a driving force for driving an object at a driving speed, the device or the apparatus comprising:a mechano-electric energy conversion element, disposed at the elastic member, which generates an output signal in response to a vibration in the elastic member, said output signal varying in accordance with the driving speed of the actuator device; anda position information forming circuit, connected to the output of the mechano-electric energy conversion element, which generates position information of the object or driving amount information of the object based on the output signal from said mechano-electric energy conversion element.