Ultrasonic motor

Abstract

An ultrasonic motor in which longitudinal vibration and flexural vibration are induced at the same time to generate elliptical vibration and driving force is obtained from the elliptical vibration to drive a driven body relatively. The ultrasonic motor includes a piezoelectric device, friction contact members which are disposed on the piezoelectric device to transmit the driving force to the driven body, a holding member which is disposed on the piezoelectric device and positioned and held within a case, a pressure member which is formed integrally with the holding member to press the friction contact members to the driven body via the piezoelectric device so that the driven body is capable of being driven under friction, and a pressure adjusting mechanism which adjusts the pressure of the pressure member to be applied to the piezoelectric device.

Dependencies are inferred from the claim text.