An ultrasonic motor comprises a piezoelectric element having first and second surfaces, a plurality of electrode patterns disposed on the first surface of the piezoelectric element, first and second circuits for short-circuiting every other one of the electrode patterns to form two electrode...http://www.google.com.au/patents/US5770912?utm_source=gb-gplus-sharePatent US5770912 - Ultrasonic motor and electronic apparatus provided with ultrasonic motor
