Patent ID: 7960897
Filing Date: 2011-06-14
Classification: H01L

Abstract:
1. An ultrasonic motor which 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, comprising: a piezoelectric device; reinforcing members which are provided at the antinodes of the flexural vibration on the top side of the piezoelectric device; friction contact members which are provided at the antinodes of the flexural vibration on the bottom side of 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 positioned and held by a case; and a pressure member which presses the holding member so that the friction contact members are brought into a pressure contact with the driven body such that the driven body is capable of being driven by friction; wherein each of the reinforcing members is provided at a plurality of antinodes of the piezoelectric device; and the plurality of antinodes of the piezoelectric device are provided on a same face.