Driving method and driving device for standing-wave-type...

Details Driving method and driving device for standing-wave-type... Driving method and driving device for standing-wave-type...

2007-12-18

2009-10-13

Benson, Walter (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S317000

Reexamination Certificate

active

07602100

ABSTRACT:
The invention provides a driving method and driving device for a standing-wave-type ultrasonic actuator which can prevent falling of and eliminate unstable motion of a driven body during activation, and which can shorten the time for the driven body to stop moving when driving is to be stopped. In the driving method for a standing-wave-type ultrasonic actuator, by generating a longitudinal vibration and a flexural vibration in an ultrasonic vibrator, a substantially elliptical vibration is produced at a friction-contact member 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 longitudinal vibration is excited at activation time, and the flexural vibration is excited thereafter.

REFERENCES:
patent: 7119476 (2006-10-01), Nagahama
patent: 7466062 (2008-12-01), Sakatani et al.
patent: 2002-199749 (2002-07-01), None

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