Method and apparatus for image registration

Details Method and apparatus for image registration Method and apparatus for image registration

1992-11-03

1994-01-11

Miller, Jr., George H.

Recorders

Electric recording

Electrochemical

346160, 355208, 355327, G03G 1501, G03G 2100, G01D 1514

Patent

active

052785874

ABSTRACT:
The present invention is directed to a precise method of registering plurality of imaging stations, so as to form sequential images on a photoreceptor belt in a single pass. A belt hole is formed in the photoreceptor belt, outside the image area, but within the scan of the imager scan line. The scan line is sequentially swept in a transverse direction across the width of the belt. As the leading edge of the belt hole advances into the sweeping beam, a plurality of beam sweeps will occur while the leading edge is moving through the sweep area. Due to the gaussian illumination of the scanning beam, the exposure at the belt edge gradually increases to a maximum point coinciding with the maximum illumination of the scanning beam. A detector is placed beneath the belt to provide a signal representing the exposure level of each scanning beam which crosses the leading edge of the advancing belt hole. The detectors produce a current output representative of the exposure level. The current output is converted into voltage outputs which are then used in an extrapolation process to determine a midpoint for the illumination profile crossing the scan line and, from this, a reference time at which the midpoint of the beam illumination was reached. This reference time is then used to generate a precisely timed line sync signal which is reproducible through each of the imaging stations to produce registration of the first scan line of each image sequence with a very high degree of accuracy.

REFERENCES:
patent: 4289371 (1981-09-01), Kramer
patent: 4611901 (1986-09-01), Kohyama et al.
patent: 4660059 (1987-04-01), O'Brien
patent: 4833503 (1989-05-01), Snelling
patent: 5175570 (1992-12-01), Haneda et al.
patent: 5189477 (1993-02-01), Leys et al.
patent: 5200791 (1993-04-01), Dastin et al.
patent: 5208633 (1993-05-01), Genovese

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