Method and apparatus for scan line skew correction using a gradient index electrooptic prism
US5493326A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1994 |
| Grant date | Feb 20, 1996 |
| Priority date | — |
| Expiry date | Jan 3, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/127
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.