Method and apparatus for scan line skew correction using a gradi

Details Method and apparatus for scan line skew correction using a gradi Method and apparatus for scan line skew correction using a gradi

1994-01-03

1996-02-20

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347134, 359 95, B41J 247

Patent

active

054933269

ABSTRACT:
An optical element for the selective scan line skew correction in a raster output scanner (ROS) of an electrostatographic printer. The optical element includes a chamber having a volume defined by parallel surfaces in substantially parallel planes containing a liquid crystal material having a variable index of refraction as a function of voltage applied thereacross. An inhomogenous electric field is generated through the liquid crystal material to produce a refractive index gradient along substantially perpendicular planes in the optical element. The ROS includes a control and feedback system coupled to a variable voltage source for applying a variable biasing voltage across the optical element to control the variable index of refraction of the liquid crystal material for selectively correcting scan line skew.

REFERENCES:
patent: 4213158 (1980-07-01), DeBenedictis
patent: 4903067 (1990-02-01), Murayama et al.
patent: 4958914 (1990-09-01), Owechko et al.
patent: 5061046 (1991-10-01), Lee et al.
patent: 5153608 (1992-10-01), Genovese
patent: 5363127 (1994-11-01), Andrews
patent: 5394223 (1995-02-01), Hart et al.
U.S. Patent Application Ser. No. 07/951,714 Inventor: Andrews, Filed: Sep. 25, 1992.

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