Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Reexamination Certificate
2006-07-04
2006-07-04
Grimley, Arthur T. (Department: 2852)
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
C347S234000
Reexamination Certificate
active
07071957
ABSTRACT:
To provide an image forming apparatus having a plurality of optical systems each simultaneously scanning two stations by one polygon mirror to minimize conveyance-directional color misregistration of an intermediate transferring belt. An electrophotographic color laser printer connected with a host computer is provided with a scanner unit common to first and second stations, a scanner unit common to third and fourth stations, and a registration-position detector for reading an image pattern formed on an intermediate transferring belt and detecting a registration position of an image of a laser beam. The plane phase of the polygon mirror in the first and second stations is controlled and central positions of image patterns by two laser beams are detected to correct the misregistration between these central positions.
REFERENCES:
patent: 4591903 (1986-05-01), Kawamura et al.
patent: 5631686 (1997-05-01), Castelli et al.
patent: 6735401 (2004-05-01), Kajiwara et al.
patent: 04-051829 (1992-08-01), None
patent: 04-313776 (1992-11-01), None
patent: 9-109453 (1997-04-01), None
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Gleitz Ryan
Grimley Arthur T.
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