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
Document File: 2 page(s) / 205K

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,

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XEROX DISCLOSURE JOURNAL

REFLECTING VESICULAR HALFTONE Proposed Classification
SCREENS U~S. Cl~ 96/27E
Warren L~ Rhodes mt. Cl~ G03c 5/04

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,

The scattering medium may be made in any transparent material
such as glass or plastic The scattering substance may be
voids, bubbles, scattering particles or roughened surfaces.
One method for producing the scattering areas is to use a
photosensitive vesicular material exposed photographically to

a patterned intermediate, Another is to produce the pattern
with a hot patterned intermediate such as a letterpress
printing plate. Any method of blushing surfaces, casting or
printing with a nonabsorbing scattering ink will produce
suitable scattering patterns.

Volume 2 Number 6 November/December 1977 23

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                    XEROX DISCLOSURE JOURNAL
24
Volume 2 Number 6 November/December 1977

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