G - Physics – 03 – G
Patent
G - Physics
03
G
314/8
G03G 15/04 (2006.01) H04N 1/036 (2006.01) H04N 1/405 (2006.01)
Patent
CA 1142993
ABSTRACT Method and apparatus for imaging charged electrophotographic member by electrostatic techniques using information which is derived from a source of binary data. The binary data may be achieved by imaging a pattern or may he synthesized electrically to represent that which it is desired to reproduce on the electrophotographic member. The binary data is applied to a pixel generator which is constructed and arranged to produce an output in the form of signals for driving an electro-optical deflector that in turn deflects a laser beam to form a composite of rays. The composite of rays represent the columns of a pattern to be applied to each pixel which is generated, the rows of the pixel being produced by a shaft encoder that is synchronized with the rotation of a cylinder carrying the electrophotographic member. The pixel generator produces hexagonal pixels and the pattern in each pixel represents density information derived from the binary data originally received by the pixel generator. The patterns in the pixels are arranged to prevent undesirable moire effects. The invention is embodied in a digital laser printing plate maker wherein an electrophotographic member receives the composite laser beam from a carriage which moves in synchronism with the rotation of the cylinder and the rate at which the composite beam is applied. The resulting latent image is toned and fused on the cylinder. After certain processing, namely, hydrophillizing of the non-imaged areas, a plate suitable for printing is formed.
345416
Coulter Systems Corporation
Johnson Douglas S. Q.c.
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