Supported by the National Natural Science Foundation of China (Grant Nos. 50577035, 10676015);High Technology Research and Development Program of China (863 Program) (Grant No. 2006AA02Z472)
This paper introduces an integrated optical auto-focus system driven by a nut-type ultrasonic motor (USM). The system comprises an optical lens as a rotor (M6 or M7), a polyhedral tube of copper as a stator; an image ...