Regulator with phase shift for polygon rephase without divide

Details Regulator with phase shift for polygon rephase without divide Regulator with phase shift for polygon rephase without divide

1997-03-31

1998-09-15

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347248, B41J 247

Patent

active

058086587

ABSTRACT:
An imaging system for forming multiple superimposed image exposure frames on a photoconductive member moving in a process direction including a rotating polygon having a plurality of facets. A raster output scanner forms a plurality of scanlines in a transverse direction across the photoconductive member by reflecting modulated beams from the rotating polygon. A method of providing scanning speed and phase shift control by providing a signal representing image exposure frame registration and a start of scan (SOS) signal representing the beginning of a scanline. The relative phase between the start of scan signal and the signal representing image exposure frame registration is determined and converted into a digital signal along with a speed determination signal by use of a fast clock timer. The digital signals are summed and inverted in polarity in order to change the speed of the rotating polygon to synchronize the signal representing image exposure frame registration with the SOS signal.

REFERENCES:
patent: 4663523 (1987-05-01), Swanberg
patent: 4975626 (1990-12-01), Yagi et al.
patent: 5208796 (1993-05-01), Wong et al.
patent: 5381165 (1995-01-01), Lofthus et al.
patent: 5640426 (1997-06-01), Ishizu

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