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

1993-05-03

1995-05-02

Reinhart, Mark J.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

H04W 121

Patent

active

054124093

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 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. The current outputs are also converted into error signals which correct for lateral and skew registration errors.

REFERENCES:
patent: 4611901 (1986-09-01), Kohyama et al.
patent: 4660059 (1987-04-01), O'Brien
patent: 4833503 (1989-05-01), Snelling
patent: 5257048 (1993-10-01), Genovese
patent: 5278587 (1994-01-01), Strauch et al.

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