Color electrophotographic process employing a document screen

Details Color electrophotographic process employing a document screen Color electrophotographic process employing a document screen

1974-05-06

1978-08-22

Martin, Jr., Roland E.

Gas separation: apparatus

Magnetic separating means

96118, G03G 1501, G03G 1301, G03F 500

Patent

active

041086546

ABSTRACT:
The present invention is directed toward a color electrophotographic imaging process and a method for extending the range capabilities of said process. The process includes providing a document screen adapted to be used at the exposure station proximate to the image face of a document to be copied, such that light reflected from the screened document is passed through a lens system and imaged onto a photosensitive member. 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 fundamental 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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