Patent ID: 6300705
Filing Date: 2001-10-09
Classification: H02N

Abstract:
An ultrasonic motor comprising:a vibration generating member having a piezoelectric member that generates a first mode ultrasonic vibration in the vibration generating member;a vibration converting member that converts a part of the first mode ultrasonic vibration transferred from the vibration generating member into a second mode ultrasonic vibration by operation of slits formed on the vibration converting member; anda rotor slidably rotatable on the vibration generating member, the rotor being driven by elliptic vibration that is a compound vibration of the first and second mode ultrasonic vibrations, wherein:the vibration converting member is substantially in a shape of a cylinder having an outer periphery and a center hole and is formed by laminating a plurality of element plates each having cut-out portions; andthe cut-out portions of each element plate form the slits when the plurality of element plates are laminated.