Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-02-14
2006-02-14
Porta, David (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S205000, C358S494000, C347S237000
Reexamination Certificate
active
06998603
ABSTRACT:
An image forming apparatus is disclosed that is capable of making it simple to initialize a laser system thereof. The image forming apparatus includes a first photo detector that detects a part of a laser beam from each of the lasers and generates respective power adjustment signals for the lasers, a second photo detector that detects another part of the scanning laser beam of each of the lasers and generates a synchronization signal corresponding to each laser, and a power adjustment control unit that changes the output power of each of the lasers to a predetermined value. During the adjustment of output powers of the lasers, the power of a laser is monitored by using the synchronization signal. The power adjustment control unit turns on a laser for power adjustment, and turns off the laser when the scanning synchronization signal is detected twice to complete the power adjustment of the laser, and then starts power adjustment of the next laser.
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Lee Patrick J.
Porta David
Ricoh & Company, Ltd.
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