Patent ID: 7786647
Filing Date: 2010-08-31
Classification: G02B,H01L,H02N

Abstract:
1. A micromotion mechanism, comprising: a fixing base; a movable element which is supported by the fixing base, and which is movable thereon; an ultrasonic actuator which has a vibration element in rectangular parallelepiped form for generating an oval vibration at a contact portion with an object to be driven using a flexural vibration and a longitudinal vibration, and which relatively moves the movable element and the fixing base; and a control device which outputs drive signals to the ultrasonic actuator; wherein the drive signals comprise a burst signal that is a drive signal for the flexural vibration and a burst signal that is a drive signal for the longitudinal vibration, said burst signals being equal in frequency and different in phase, wherein an amplitude of a start and end of the burst signal for the flexural vibration and the burst signal for the longitudinal vibration temporally-changes, and wherein a maximum amplitude of one of the burst signal for the flexural vibration and the burst signal for the longitudinal vibration is lower than in a normal driving operation.