Browse Prior Art Database

A COLOR ELECTROPHOTOGRAPHIC PRINTING PROCESS

IP.com Disclosure Number: IPCOM000023247D
Original Publication Date: 1977-Apr-30
Included in the Prior Art Database: 2004-Mar-29
Document File: 6 page(s) / 711K

Publishing Venue

Xerox Disclosure Journal

Abstract

An original document having color highlighted areas therein may be reproduced electrophotographically by employing a corona generating device 18 to charge photoconductive member 10. Photoconductive member 10 includes a photoconductive surface 14 secured to a conductive substrate 12 and having a transparent insulating layer or overcoating 16 coated thereon. As shown in Figure ib, the charged portion of photocoriductive member 10 is exposed to a filtered light image of the original document. Original document 20 includes a red region 22, white region 24, green region 26, and black region 28. Lamp assembly 30, lens system 32 and filter mechanism 34 scan orig-inal document 20 in the direction of arrow 36 arid project a light image thereof onto the charged portion of photoconduc-tive member 10. Initially, a red filter is interposed into the optical light path to produce the charge pattern depicted in Figure lb. This step is repeated for green and blue fil-tered light images, respectively, resulting in a latent image corresponding to the black regions of the original document. The resulting charge pattern on photoconductive member 10 is shown in Figure lc. As shown in Figure ic, black toner par-ticles 44 adhering to magnetic brush roller 38, which rotates in the direction of arrow 40 and advances in the direction of arrow 42, are deposited on the charged portion of photoconduc-tive member 10. The developed image is transferred to copy sheet 46 (Figure ld). Copy sheet 46 is positioned in contact with photoconductive member 10. Transfer roll 48 is elec-trically biased to attract electrostatically toner particles 44 from photoconductive member 10 to copy sheet 46. Transfer roll 48 rotates in the direction of arrow 50-, In this way, the black region of the original document is formed on the copy sheet.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 55% of the total text.

Page 1 of 6

XEROX DISCLOSURE JOURNAL

A COLOR EL~CTROPHOTOGRAPHIC
PRINTING PROCESS
L. Bean

Proposed Classification
US. Cl. 355/4
mt. Cl. G03g 15/01

t1~ivL~

F/Q Ia

~2 ç4 26 2~ 2~

1llTh~IB~ ~

32ric~m

36

+ ~+ + + + + + + + + + + H~1- +

L~j ~

Volume 2 Number 2 March/April 1977 75

FIG Ic

FiG Id

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

Page 2 of 6

A COLOR .ELECTROPHOTOGRAPHIC PRINTING PROCESS (Cont'd)

r-'6

4. + + + + + + + + + ++ + + + + 4-F 44

FIG 2a

22 24 2 24 28

ififtililiBlil *' '~'

FIG 2b

~4~32

Lii

16

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12

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FIG 2c

l-+++++++4-f44+++++++

24

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                 XEROX DISCLOSURE JOURNAL 76 Volume 2 Number 2 March/April 1977

FIG 2d 4q32

_____'r-16

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

Page 3 of 6

A COLOR ELECTROPHOTOGRApHIC PRINTING PROCESS (Cont~d)

-I- -4-

FIG 2c

FIG 2~

FIG 2q

FIG 2i~

XEROX DISCLOSURE JOURNAL
Volume 2 Number 2 March/April 1977 77

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

Page 4 of 6

A COLOR ELECTROPHOTOGRAPHIC PRINTING PROCESS (Cont'd)

An original document having color highlighted areas therein
may be reproduced electrophotographically by employing a
corona generating device 18 to charge photoconductive member
10. Photoconductive member 10 includes a photoconductive
surface 14 secured to a conductive substrate 12 and having a
transparent insulating layer or overcoating 16 coated thereon.
As shown in Figure ib, the charged portion of photocoriductive
member 10 is exposed to a filtered light image of the original
document. Original document 20 includes a red region 22,
white region 24, green region 26, and black region 28. Lamp
assembly 30, lens system 32 and filter mechanism 34 scan orig-
inal document 20 in the direction of arrow 36 arid project a
light image thereof onto the charged portion of photoconduc-
tive member 10. Initially, a red filter is interposed into
the optical light path to produce the charge pattern depicted
in Figure lb. This step is repeated for green and blue fil-
tered light images, respectively, resulting in a latent image
corresponding to the black regions of the original document.
The resulting charge pattern on photoconductive member 10 is
shown in Figure lc. As shown in Figure ic, black toner par-
ticles 44 adhering to magnetic brush roller 38, which rotates
in the direction of arrow 40 and advances in the direction of
arrow 42, are deposited on the charged portion of photoconduc-
tive member 10. The developed image is transferred to copy
sheet 46 (Figure ld). Copy sheet 46 is positioned in contact
with photoconductive member 10. Transfer roll 48 is elec-
trically biased to attract electrostatically toner particles
44 from photoc...