Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1993-12-03
1996-08-06
Fuller, Benjamin R.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347244, 347238, B41J 2435, B41J 245
Patent
active
055438300
ABSTRACT:
Method and apparatus for forming grey-scale images on a photosensitive imaging medium, the medium being capable of spatial resolution finer than pixel dimensions of the exposing apparatus. The medium is exposed to a pixellated array of exposure sources which may be liquid crystal shutters or light emitting diodes. A transmission density is developed in imaged areas that varies non-linearly with the exposure energy received by the imaged areas in which the exposure conditions are adjusted such that the variation in average transmission over a whole pixel area from image pixel to image pixel caused by spatial energy distribution variations is less than 5% for the same energy delivered to each pixel area. The pixellated array of energy sources may be two rows of exposure pixels in a parallel but staggered configuration and associated with a SELFOC lens array, each of the exposure pixels having a light-emitting area, in which light-emitting areas of one of the two rows are substantially the same size and shape as gaps between light-emitting areas of the other of the two rows. The pixellated array may also be a single row of exposure pixels associated with an array of microlenses and the SELFOC lens array, arranged so that the expression:
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Fuller Benjamin R.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Shumaker Steven J.
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