Electricity: motive power systems – Motor-reversing
Reexamination Certificate
2005-05-31
2005-05-31
Masih, Karen (Department: 2837)
Electricity: motive power systems
Motor-reversing
C318S445000, C318S434000, C318S504000
Reexamination Certificate
active
06900605
ABSTRACT:
The present invention provides a mirror device motor control circuit that can reliably stop a mirror at predetermined positions with a simple configuration. In the control circuit of the invention, part of a lock current flowing to the motor flows to a base terminal of a transistor. Thus, as long as a voltage corresponding to the lock current is equal to or greater than a specific value, this voltage is applied to the base terminal of the transistor, whereby between a collector terminal and an emitter terminal becomes conductive, and the current flowing to a gate of a MOSFET is grounded via the collector terminal and the emitter terminal of the transistor. For this reason, when the lock current flows, conduction between a drain terminal and a base terminal of the MOSFET is released and a drive current of the motor is cut off.
REFERENCES:
patent: 4374348 (1983-02-01), Shimura et al.
patent: 2003/0076148 (2003-04-01), Tamiya et al.
patent: 2003/0081440 (2003-05-01), Komatsu et al.
patent: 08-142756 (1996-06-01), None
patent: 8-207663 (1996-08-01), None
patent: 9-107691 (1997-04-01), None
patent: 10-278675 (1998-10-01), None
European Search Report dated Nov. 3, 2004 in corresponding European Application No. EP 03 25 5282.
Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho
Masih Karen
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