Scan uniformity correction

Details Scan uniformity correction Scan uniformity correction

1992-07-02

1998-04-28

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347134, B41J 247

Patent

active

057451559

ABSTRACT:
A raster output scanner (ROS) with a liquid crystal window located at the output of the ROS for correcting the nonuniformity of a light beam generated by the ROS is disclosed. Since the photocells in the liquid crystal can be controlled individually, a variable attenuation to match the curve of the intensity of the light beam, generated by the ROS, can be applied to the light beam. When the light beam with a variable intensity passes through the liquid crystal window of this invention, each cell applies an attenuation to offset the variation in intensity of the light received by that cell. Therefore, the light beam emerging from the liquid crystal window will have a uniform intensity regardless of the variation of the intensity generated by the ROS.

REFERENCES:
patent: 4920364 (1990-04-01), Andrews et al.

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