Means and method for controlling raster output scanner intensity

Details Means and method for controlling raster output scanner intensity Means and method for controlling raster output scanner intensity

1990-08-20

1992-11-17

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Picture signal generator

358406, 358475, H04N 104

Patent

active

051650746

ABSTRACT:
Output copy quality in a ROS electrophotographic printer is maintained by a method and apparatus designed to selectively vary the beam intensity level of a laser beam scan in response to changed conditions within the scanning or xerographic output subsystems. A test pattern video data input is periodically applied to a laser creating an exposure of the test pattern at the photoreceptor. The resulting print has a plurality of horizontal bands with each band associated with a specific beam intensity correction signal. The test pattern band which appears to provide optimum density is identified. The corresponding digital beam intensity correction signal in the ESS memory is enabled and replaces the previous beam intensity signal controlling the laseer output level.

REFERENCES:
patent: 3489849 (1970-01-01), Hedger
patent: 4400740 (1983-08-01), Traino et al.
patent: 4716470 (1987-12-01), Levine
patent: 4727382 (1988-02-01), Negishi et al.
patent: 4751377 (1988-06-01), Ishizaka et al.
patent: 4958221 (1990-09-01), Tsuboi et al.

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