Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-08-19
1993-05-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
358481, H01J 516
Patent
active
052123812
ABSTRACT:
A method of slow, or process, scan direction spot registration or position control in an optical output device, such as a raster output scanner (ROS), may be facilitated by interposing in the image path an electro-optic element whose angular dispersion varies for a given wavelength as a function of the electrical bias applied to it. By orienting the electro-optic element such that dispersion control is perpendicular to the fast or line scan direction of the ROS, varying the electrical bias applied to it varies the dispersion in the slow scan direction. The electro-optic element may be, for example, a prism of AlGaAs. Bias applied to the electro-optic element may be in response to the output of a means for detecting and quantifying such positional errors and/or in response to predetermined correction information output from a processor controlled memory unit or the like. Spot position for single or multiple beam optical output device may be achieved.
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Appel James J.
Paoli Thomas L.
Kelly John M.
Le Que T.
Nelms David C.
Small Jonathan A.
Xerox Corporation
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