Coherent light generators – Particular component circuitry – Having fault protection circuitry
Reexamination Certificate
2003-10-17
2008-03-11
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular component circuitry
Having fault protection circuitry
C372S029011, C347S246000, C347S247000
Reexamination Certificate
active
07342949
ABSTRACT:
A laser scanning device includes a semiconductor laser that emits a laser beam, a laser power detector that detects laser beam power of the semiconductor laser, a reference voltage generator that generates reference voltage for controlling the laser beam power of the semiconductor laser in accordance with a laser power control signal provided from an external device, and a laser driver that compares the reference voltage generated by the reference voltage generator and the laser beam power detected by the laser power detector to control a driving current supplied to the semiconductor laser for emitting the laser beam. The laser scanning device further includes an abnormal condition detector that detects the laser power control signal received by the reference voltage generator. When the detected laser power control signal differs from a predetermined signal, which indicates that the connection between the reference voltage generator and the external device is poor, the abnormal condition detector stops the laser driver from operating.
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Patents Abstracts of JP11-042814.
Golub Marcia A.
Greenblum & Bernstein P.L.C.
Harvey Minsun
PENTAX Corporation
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