Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2011-04-26
2011-04-26
Dougherty, Thomas M (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S323010, C310S323020, C310S323050, C310S323060, C310S323080, C310S323130
Reexamination Certificate
active
07932660
ABSTRACT:
An ultrasonic motor has a cylindrical rotor for performing a mechanical output, a plurality of ultrasonic vibrators each having two points in internal contact with the rotor, and a preload mechanism for pressing the ultrasonic vibrators from an inside toward an outside of the rotor, and the ultrasonic vibrators are provided to be rotatable relative to the preload mechanism. With this configuration, an internal contact type ultrasonic motor capable of performing efficient drive by using a plurality of ultrasonic vibrators each in contact with a cylindrical rotor at two points and allowing contact at all contact points without requiring a high machining accuracy can be provided.
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Matsunaga, Y. et al., “An In-wheel type micro ultrasonic motor using sector-shaped Piezoelectric Ceramics Vibrators” Thesis Committee for the Symposium on the Basics and Applications of Ultrasonic Electronics, Proceedings of the 27th Symposium on the Basics and Application Electronics, Nov. 15, 2006, vol. 27, pp. 489-490.
Kanda, T. et al., “A Micro Ultrasonic Motor Using Sector -shaped Piezoelectric Vibrators and a low-profile Preload Mechanism”, Japan Society of Mechanical Engineers, Robotics and Mechatronics Division, Proceedings of the JSME Conference on Robotics and Mechatronics, May 10-12, 2007, pp. 1A2-B01.
Hamamoto Masaki
Kotani Teruhisa
Birch & Stewart Kolasch & Birch, LLP
Dougherty Thomas M
Sharp Kabushiki Kaisha
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