US 7,321,182 B2
Oscillatory-wave actuator and method for driving oscillatory-wave actuator
Kenichi Kataoka, Yokohama (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Filed on May 26, 2006, as Appl. No. 11/441,909.
Claims priority of application No. 2005-161799 (JP), filed on Jun. 01, 2005.
Prior Publication US 2006/0273689 A1, Dec. 07, 2006
Int. Cl. H02N 1/04 (2006.01)
U.S. Cl. 310—323.02 5 Claims
OG exemplary drawing
 
1. An oscillatory-wave actuator configured to form first and second standing waves having positions which are shifted according to their time of generation, wherein a traveling wave is formed by synthesis of the first and second standing waves, the actuator comprising:
an elastic body configured to generate standing waves;
a movable body in contact with the elastic body, wherein the movable body is driven according to the traveling wave;
a first electromechanical transducer configured to form the first standing wave in response to a supplied voltage;
a second electromechanical transducer configured to output a vibration-detecting voltage in response to vibration from the first standing wave; and
a third electromechanical transducer configured to be supplied only with the vibration-detecting voltage and form the second standing wave in response to the vibration-detecting voltage.