US 7,602,100 B2
Driving method and driving device for standing-wave-type ultrasonic actuator
Junji Okada, Tokyo (Japan)
Assigned to Olympus Corporation, Tokyo (Japan)
Filed on Dec. 18, 2007, as Appl. No. 11/958,829.
Claims priority of application No. 2007-000770 (JP), filed on Jan. 05, 2007.
Prior Publication US 2008/0164783 A1, Jul. 10, 2008
Int. Cl. H02N 2/00 (2006.01); H01L 41/09 (2006.01)
U.S. Cl. 310—316.02  [310/317] 6 Claims
OG exemplary drawing
 
1. A driving method for a standing-wave-type ultrasonic actuator in which, by generating a longitudinal vibration and a flexural vibration in an ultrasonic vibrator, a substantially elliptical vibration is produced at an output end of the ultrasonic vibrator, and with a frictional force of the elliptical vibration serving as a propulsive force, the ultrasonic vibrator and a driven body in contact with the ultrasonic vibrator are made to move relative to each other, the method comprising:
exciting the longitudinal vibration at activation time, and exciting the flexural vibration thereafter.