Raser output scanner color printer with improved start of scan d

Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means

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346160, 355202, H04N 121, B41J 2435

Patent

active

053195370

ABSTRACT:
A Raster Output Scanner (ROS) color printer is formed by providing several ROS imagers adjacent image exposure locations of a photoreceptor belt. Each ROS imager forms a separate color image in response to video input signals with each color image superimposed in registration over the previously formed images. Registration in the process direction is enabled by a quad cell photosensor whose output is continually compared to determine whether process registration deviations from a previously established position are necessary. Correction signals are generated in an iterative fashion until a preselected process registration position is re-established. The quad cell detector is also used for a second function; to produce the start and end of scan signals which enable image registration in the cross-process direction.

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patent: 4791452 (1988-12-01), Kasai et al.
patent: 4833503 (1989-05-01), Snelling
patent: 5208796 (1993-05-01), Wong et al.

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