This motor of the piezo-electric type comprises a stator (1) and a rotor (15) intended to effect relative movement to one another. The stator (1) comprises a plate (17) of generally planar form and means for generating therein vibratory waves at an ultrasonic frequency. Such waves enable the imparting...http://www.google.com.au/patents/US5296776?utm_source=gb-gplus-sharePatent US5296776 - Piezo-electric motor intended for a timepiece
