Using multiple digitally-produced exposure levels to compensate

Details Using multiple digitally-produced exposure levels to compensate Using multiple digitally-produced exposure levels to compensate

1997-01-21

2000-08-29

Le, N.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347232, 347251, 347131, 347900, 358300, 399181, B41J 2385

Patent

active

061115932

ABSTRACT:
A method for achieving multiple exposure levels for IOI (IMAGE-ON-IMAGE) xerography when imaging a second color through a first toner layer previously developed on the photoreceptive member. In the example illustrated the data from the previous image paths (magenta and yellow) is analyzed. If the signal indicates that a magenta or yellow bit is present, the cyan output bit information passes to the ROS unchanged, or at full intensity. If however, the magenta and yellow are not present, a modified pattern providing an appropriate reduced exposure signal is sent to the ROS. The process of laser attenuation is blended with halftoning logic to avoid image degradation due to the attenuation.

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patent: 5157483 (1992-10-01), Shoji et al.
patent: 5252995 (1993-10-01), Trask et al.
patent: 5296877 (1994-03-01), Sato
patent: 5471324 (1995-11-01), Rolleston
patent: 5585945 (1996-12-01), Ikeda et al.

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