Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-05-23
1989-07-04
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250236, 358494, 346154, H01J 314, H01J 516, H01J 4914
Patent
active
048453587
ABSTRACT:
A synchronizing device is used in a laser printer which comprises a polygonal mirror for periodically deflecting a laser beam which scans a scanning plane and a photodetector provided on the scanning plane outside a region in which a printing is made by the laser beam for outputting an output signal when the laser beam is detected. The output signal of the photodetector is used for producing an image scan clock signal which synchronizes each scan of the laser beam. The synchronizing device comprises a pulse generating circuit for generating a plurality of pulse signals having a frequency identical to that of the image scan clock signal and having phases which are successively shifted by a constant phase with respect to each other, a clock selecting circuit for selectively outputting one of the plurality of pulse signals generated by the pulse generating circuit as the image scan clock signal, and a setting circuit for arbitrarily setting the pulse signal to be selectively outputted from the clock selecting circuit responsive to the output signal of the photodetector.
REFERENCES:
patent: 4449046 (1984-05-01), Zuckerman et al.
patent: 4539478 (1985-09-01), Sano
patent: 4720632 (1988-01-01), Kaneko
Nelms David C.
Oen William L.
Ricoh Co. Ltd.
LandOfFree
Synchronizing device for laser printer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Synchronizing device for laser printer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synchronizing device for laser printer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-854682