Image registration for a raster output scanner (ROS) color print

Details Image registration for a raster output scanner (ROS) color print Image registration for a raster output scanner (ROS) color print

1996-07-01

1998-10-13

Le, N.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347118, 347153, B41J 2385, G03G 1501

Patent

active

058219714

ABSTRACT:
The present invention is directed to a precise method of registering a plurality of ROS imagers, so as to form sequential registered images on a photoreceptor belt in a single pass. Pairs of belt holes are formed in the photoreceptor belt, outside the image area and outside of the scan width of the ROS imagers. A pair of light sources are incorporated into the post polygon optics of each ROS imager so as to produce a light spot at the photoreceptor surface which will periodically illuminate the holes on the belt. As the leading edge of the belt holes advances into the beams, detectors placed beneath the belt and beneath the exposure station provide signals representing the exposure level of the light source output. The position of a transmissive optical element with no optical power, subsequent to each of said ROS imagers, is adjusted in response to registration error signals generated by said photodetecting means to adjust the position of said scan lines. The detectors produce a current output representative of the exposure level. The current output is converted into page sync signals which are reproducible through each of the imaging stations to produce registration of the first scan line of each image sequence.

REFERENCES:
patent: 4660059 (1987-04-01), O'Brien
patent: 4833503 (1989-05-01), Snelling
patent: 5302973 (1994-04-01), Costanza et al.
patent: 5412409 (1995-05-01), Costanza

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