Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Patent
1993-12-09
1997-10-28
Fuller, Benjamin R.
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
347112, 347132, B41J 2385, B41J 241, G03G 1304
Patent
active
056821921
ABSTRACT:
To create a latent electrostatic gray scale image on a charge receptor, a gray scale generator determines a charge distribution for a unit cell having at least two pixels. A charge manager then determines the amount of charge to be placed in each pixel. More specifically, the charge amount for a first ON pixel in the unit cell is assigned a relative full charge amount. The charge amount in each succeeding ON pixel is determined such as to ensure faithful reproduction of gray scale for any given ratio of pixel size to charge receptor thickness. To increase the developability in proportion to the gray scale, the charge manager manages the charge amount of succeeding ON pixels to be a smaller amount than the first ON pixel.
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Fuller Benjamin R.
Gordon Raquel Yvette
Nickerson Michael J.
Xerox Corporation
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