Method and apparatus for image registration in a single pass ROS

Details Method and apparatus for image registration in a single pass ROS Method and apparatus for image registration in a single pass ROS

1996-07-01

1999-03-30

Le, N.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347118, B41J 2385, G03G 1501

Patent

active

058895450

ABSTRACT:
A single pass ROS system provides a plurality of latent images which may subsequently be developed in different colors. The ROS units are initially aligned so that each color image is precisely registered at the same relative position along the exposed area of a photoreceptor belt. The alignment is accomplished by forming a pair of opposed alignment apertures in the surface of the belt and detecting coincidence or lack of coincidence of signals generated by the beginning and end of each scan line. The correction is enabled by rotating the output window in the ROS system, a transmissive optical component with no optical power, subsequent to the ROS, to create the required rotation of the projected scan line. Once the initial X and Y-axis alignments are complete, subsequent alignment is maintained through subsequent passes by checking the positions of the previously identified pixels as they advance past additional lead edge apertures formed in the process direction along the belt surface.

REFERENCES:
patent: 4660059 (1987-04-01), O'Brien
patent: 5208796 (1993-05-01), Wong et al.
patent: 5302973 (1994-04-01), Costanza et al.

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