G - Physics – 03 – G
Patent
G - Physics
03
G
314/12
G03G 13/01 (2006.01) G03G 15/01 (2006.01) H04N 1/50 (2006.01)
Patent
CA 1167512
ABSTRACT This invention relates generally to color copying and particularly concerns electrostatic color copying technique. An apparatus and method for making color copies of a color original in which color resolved latent electrostatic image components of the original are formed on the surface of a rotating electrophotographic drum, developed with color corresponding development material from a developing device and then transferred to a sheet of carrier material, such as paper, in superimposed relationship. The color resolved latent electrostatic images are formed on the surface of the electrophotographic drum by converting the color resolved image of the original into digital data, feeding the data into a computer and then writing the images on the surface of the electrophotographic drum with a laser whose output is modulated by the digital data. The color resolved images are obtained by projecting an image of the color original through color separation filters. The developing device includes a plurality of developing units, each containing developing material whose color corresponds to one of the color image components of the color original. The developing units are moved past the drum, seriatim in a stepwise cycle. The movement of developing device and the electrophotographic drum are coordinated so that each developing unit will apply developing material to its corresponding latent electrostatic image during the dwell period of the developing device when said developing unit is in toner applying relation with the drum.
347966
Kruse Jurgen
Kuehnle Manfred R.
Rose Robert M.
Coulter Systems Corporation
Johnson Douglas S. Q.c.
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