Michael S Langdon

US Patent:

41359275, Jan 23, 1979

Filed:

May 15, 1975

Appl. No.:

5/577814

Inventors:

Vaidevutis C. Draugelis - Rochester NY
William R. Hartman - Rochester NY
Michael J. Langdon - Penfield NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1301

US Classification:

96 12

Abstract:

Method and apparatus are herein disclosed for xerographically reproducing a color copy from a multi-color original. A moving photoconductive surface is sequentially exposed through color filters to form a series of color separated latent electrostatic images thereon. Each image formulated contains original input scene information of selected colors recorded at a first image potential and other input scene information recorded at a second potential, the first recorded potential being greater in magnitude that the second recorded potential. Development of the images is achieved by passing an electroscopic developer material between the photoconductive surface and a control electrode biased to a potential somewhere between the first and second image potentials found on the photoconductor whereby recorded input scene information containing the selected color is developed and, simultaneously therewith, development of all other information is prevented. In this particular process, the color separated light images are formulated by passing reflected light from the multi-color original sequentially through red, green and blue filters and the images developed by applying a cyan toner to the red separated image, a magenta to the green separated image and a yellow to the blue separated image. The three developed images are placed in superimposed registration upon a final support material to produce a high fidelity copy of the multi-color original.