Patent ID: 6133671
Filing Date: 2000-10-17
Classification: G02B,H02N

Abstract:
A vibration type motor device having a driving electro-mechanical energy converting element mounted on a vibrator and adapted to obtain a driving force by applying a frequency signal to said converting element or a movable member driving device including said vibration type motor device and adapted to drive a movable member using said motor device as a drive source, said device comprising:a driving circuit for periodically applying a first voltage to one electrode of said driving electro-mechanical energy converting element and a second voltage 180.degree. out of phase from the first voltage to the other electrode;a vibration detection electro-mechanical energy converting element connected to the other electrode of said driving electro-mechanical energy converting element;a first step-down circuit for stepping down a voltage at one electrode of said driving electro-mechanical energy converting element to a voltage not more than a predetermined voltage level;a second step-down circuit for stepping down an output from said detection electro-mechanical energy converting element to a voltage not more than the predetermined voltage level; anda processing circuit for receiving outputs from said first step-down circuit and said second step-down circuit.