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Browse Prior Art Database

REFLECTING VESICULAR HALFTONE SCREENS

IP.com Disclosure Number: IPCOM000023512D
Original Publication Date: 1977-Dec-31
Included in the Prior Art Database: 2004-Mar-31

Publishing Venue

Xerox Disclosure Journal

Abstract

It is disclosed to use halftone patterns or random patterns (including lines) made of non-absorbing scattering materials for range extension and solid area enhancement in electro-photographic copying. The scattering material will appear white when backed by a white area and varying shades of gray as the copy density increases. The amount of scattering can be adjusted so that the blackest areas in the copy just copy black while any lesser density will copy as neutral. Even in the blackest areas the exposure will produce a charge pattern on the photoconductor which will result in solid area develop-ment,