Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2008-09-24
2010-11-23
Budd, Mark (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S316020, C310S323020
Reexamination Certificate
active
07839050
ABSTRACT:
A drive apparatus for an ultrasonic motor is provided wherein a diphase alternating drive signal having a predetermined phase difference and a predetermined drive frequency is applied to an ultrasonic vibrator equipped with a driver to be in contact with a driven member, such that longitudinal vibration and bending vibration are simultaneously generated in the ultrasonic vibrator to generate elliptical vibration, and drive force is obtained from the elliptical vibration to drive the driven member by the ultrasonic vibrator. The drive apparatus for the ultrasonic motor includes drive unit for generating the alternating drive signal and applying the alternating drive signal to the vibrator to drive the driven member, and burst drive unit for performing burst drive by applying, to the vibrator, a burst signal to inhibit residual vibration in the driven member after the driving of the driven member by the drive unit has been stopped.
REFERENCES:
patent: 5099180 (1992-03-01), Noguchi
patent: 5157300 (1992-10-01), Kataoka et al.
patent: 5191688 (1993-03-01), Takizawa et al.
patent: 6020673 (2000-02-01), Matsumoto
patent: 2002-369557 (2002-12-01), None
Budd Mark
Olympus Corporation
Scully , Scott, Murphy & Presser, P.C.
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