Ultrasonic motor

Abstract

An ultrasonic motor produces elliptical vibration by inducing longitudinal vibration and flexural vibration at the same time and drives a driven body by obtaining a drive power from the elliptical vibration. The ultrasonic motor includes a piezoelectric device, friction contact members which are provided on the piezoelectric device so as to transmit the driving force to the driven body, a holding member which is provided on the piezoelectric device and to be positioned and held by a case, a pressure member which presses the holding member so as to bring the friction contact members of the piezoelectric device into a pressure contact with the driven body such that the driven body is capable of being driven by friction, and a first reinforcing member which is fixed to the outer face corresponding to nodes of the longitudinal vibration of the piezoelectric device.

Dependencies are inferred from the claim text.