Browse Prior Art Database

MULTI-COLOR SCREEN FOR ELECTROPHOTOGRAPHIC PRINTING

IP.com Disclosure Number: IPCOM000023384D
Original Publication Date: 1977-Aug-31
Included in the Prior Art Database: 2004-Mar-30
Document File: 2 page(s) / 352K

Publishing Venue

Xerox Disclosure Journal

Abstract

An optical system used in an electrophotographic printing machine includes lamps 28 which move across platen 26 illum-inating original document 24 disposed face down thereon. Lens 20 and filter 22 move in synchronism therewith. The light rays reflected from original document 24 are transmitted through platen 26 onto mirror 72. Mirror 72 reflects the light rays through lens 20 and filter 22 onto mirror 74. Mir-ror 74 reflects the light image through screen 30 onto the charged portion of photoconductive surface 14. Filter mechan-ism 22 is adapted to interpose a red filter, a blue filter and a green filter into the optical light path in sequence with one another.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

A MULTI-COLOR SCREEN FOR
ELECTROPHOTOGRAPHI~PRINTING
R.M. Bä~bbe~

Proposed Classification
U.S. Cl. 355/4
mt. Cl. G03g 15/01

j24

420 22

FIG. /

78

Volume 2 Number 4 July/August 1977 83

FI&2

An optical system used in an electrophotographic printing
machine includes lamps 28 which move across platen 26 illum-
inating original document 24 disposed face down thereon. Lens
20 and filter 22 move in synchronism therewith. The light
rays reflected from original document 24 are transmitted
through platen 26 onto mirror 72. Mirror 72 reflects the
light rays through lens 20 and filter 22 onto mirror 74. Mir-
ror 74 reflects the light image through screen 30 onto the
charged portion of photoconductive surface 14. Filter mechan-
ism 22 is adapted to interpose a red filter, a blue filter and
a green filter into the optical light path in sequence with
one another.

Screen 20 comprises a transparent sheet 76 having a plurality
of sets of hard dots thereon. Each set of dots acts as a light

[This page contains 1 picture or other non-text object]

Page 2 of 2

A MULTI-COLOR SCREEN FOR ELECTROPHOTOGRAPHIC PRINTING (Cont' d)

filter permitting light rays having a discrete spectral band
to pass therethrough. A set of yellow dots 78 is oriented at
about 15° to the horizontal of transparent sheet 76. The set
of magenta dots 80 is rotated 30° from the set of yellow dots
78. Hence, the magenta dots 80 are oriented at 45°relative to
the horizontal of transparent sheet 76. Cyan dots 82 are
ori...