G - Physics – 03 – G
Patent
G - Physics
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G
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G03G 13/01 (2006.01) G03G 15/01 (2006.01) G03G 15/04 (2006.01)
Patent
CA 1062762
A COLOR SCREEN FOR OBJECT SCREENING ABSTRACT OF THE DISCLOSURE The present invention is directed towards a method for extending the range of high contrast color electrophoto- graphic imaging processes. This is accomplished by providing a colored document screen adapted to be used at the exposure station proximate to the image face of the document to be copied. The document screen consists of a clear transparent base member having a dot pattern comprising dots of at least one color, preferably dots of two or more different colors. The frequency of the like dots is such that the optical system employed in the electrophotographic process passes spatial frequencies reflected from the screened original at the fundam- ental screen frequency but attenuates the harmonic spatial frequencies. The developed image is found to consist of a plurality of halftone colored dots of varying sizes, the dot sizes varying in accordance with the reflectivity or optical density of the original document.
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