Drive unit

Details Drive unit Drive unit

2011-03-01

2011-03-01

Dougherty, Thomas M (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S346000

Reexamination Certificate

active

07898146

ABSTRACT:
A drive unit includes a vibration actuator for controlling the piezoelectric element. A control section controls the vibration actuator switchably between a normal operation mode in which the piezoelectric element vibrates at a predetermined frequency to let the vibration actuator output a driving force, and a heating mode in which the piezoelectric element vibrates in a direction perpendicular to a direction of the driving force at a frequency different from the frequency in the normal operation mode to heat the piezoelectric element.

REFERENCES:
patent: 5365139 (1994-11-01), Kasuga et al.
patent: 6727635 (2004-04-01), Okamoto et al.
patent: 6979936 (2005-12-01), Ganor et al.
patent: 7408288 (2008-08-01), Hara
patent: 7701115 (2010-04-01), Higashionji et al.
patent: 2008/0179996 (2008-07-01), Adachi
patent: 2008/0278033 (2008-11-01), Adachi et al.
patent: 2008/0278035 (2008-11-01), Higashionji et al.
patent: 2004-304963 (2004-10-01), None
Office Action mailed Aug. 24, 2009 in relation to U.S. Appl. No. 12/111,247.

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