Electricity: motive power systems – Motor-reversing
Reexamination Certificate
2011-05-10
2011-05-10
Benson, Walter (Department: 2837)
Electricity: motive power systems
Motor-reversing
C318S400220, C318S400290
Reexamination Certificate
active
07940017
ABSTRACT:
The present invention is intended to, when rotation of a mirror rotation unit in a power-folding mirror is mechanically locked and its drive motor is thereby locked, make it possible to correctly detect this locked state. A motor10for a power-folding mirror is reversibly driven by an H-bridge drive circuit12formed of FETs1to4. When the motor10is driven in normal rotation by turning the FETs1and4on and turning the FETs2and3off, the FET1is periodically turned off to detect a voltage of a terminal10aof the motor10by means of a voltage detection circuit14. When the FET1is turned off and the motor10is not locked, the motor10generates power by means of its inertial rotation, and when locked, the motor10generates no power, so the voltage detected by the voltage detection circuit14changes according to whether or not the motor10is locked. A CPU20determines whether or not the motor10is locked according to the voltage detected by the voltage detection circuit14.
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English language Abstract of JP 8-40146, Feb. 13, 1996.
U.S. Appl. No. 12/079,279 (unpublished), filed Mar. 26, 2008.
Benson Walter
Greenblum & Bernstein P.L.C.
Murakami Corporation
Paul Antony M
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