Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2010-01-22
2011-12-27
Dougherty, Thomas M (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S323010, C310S323050, C310S323160, C310S323170
Reexamination Certificate
active
08084921
ABSTRACT:
An ultrasonic motor drive apparatus comprises a piezoelectric element107having a plurality of piezoelectrically active regions, in which longitudinal vibration and flexural vibration are induced with application of alternate signals to the plurality of piezoelectrically active regions, a piezoelectric element holder108that is fixedly attached to the piezoelectric element, covering the neighborhood of a common node of the longitudinal vibration and the flexural vibration induced in the piezoelectric element all along the circumference of the central portion of the piezoelectric element with respect to the longitudinal direction, a vibrator holder103having a plurality of openings, a driven member104having a substantially spherical shape, an output shaft106attached to the driven member, through which power output of the driven member is transmitted, a pressing member102that brings the driven member104and the piezoelectric member into pressure contact with each other along the third direction, a cap105having an opening105a, a link member101one end of which is connected with the pressing member102along the third direction and the other end of which can be connected with another apparatus, and a control section600that applies an alternate signal to the piezoelectric member.
REFERENCES:
patent: 2008/0238249 (2008-10-01), Takahashi et al.
patent: 2009/0225388 (2009-09-01), Zaifrani et al.
patent: 2009/0256445 (2009-10-01), Kotani et al.
patent: 2009/0267455 (2009-10-01), Takasan et al.
patent: 2010/0084944 (2010-04-01), Suzuki
patent: 2005-143176 (2005-06-01), None
Kasai Yasuaki
Sakai Nagahide
Dougherty Thomas M
Olympus Corporation
Scully , Scott, Murphy & Presser, P.C.
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