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VARIABLE CONTRAST EXTENDED RANGE REPRODUCTION

IP.com Disclosure Number: IPCOM000023067D
Original Publication Date: 1976-Jul-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 198K

Publishing Venue

Xerox Disclosure Journal

Abstract

The range of an electrophotographic printing machine may be extended by employing a screen 10 positioned closely adjacent to photoconductive member 12. Lamps 14 scan original document 16 disposed on transparent platen 18, The light rays reflected from original document 20 are transmitted through lens 20 forming a light image thereof. The light image is projected through screen 10 to form a half tone light image which irradiates the charged portion of photoconductive member l2~ This records a modulated electrostatic latent image on photoconductive member 12. Copy contrast may be adjusted by regulating the aperture of lens 20. Moreover, the spacing between screen 10 and the surface of photoconductive member 12 may also be regulated to further improve contrast, In addition, the distance between lens 20 and photoconductive member 12 also controls contrast, as well as magnification. Finally, the screen may be a glass cross line screen and the periodicity of the cross lines effects contrast.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

VARIABLE CONTRAST EXTENDED Proposed Classificaton
RANGE_REPRODUCTION tJ.S. Cl~ 355/3
Robert Goren Int, Cl. G03g 15/00

20*

The range of an electrophotographic printing machine may
be extended by employing a screen 10 positioned closely
adjacent to photoconductive member 12. Lamps 14 scan
original document 16 disposed on transparent platen 18,
The light rays reflected from original document 20 are
transmitted through lens 20 forming a light image thereof.
The light image is projected through screen 10 to form a
half tone light image which irradiates the charged portion
of photoconductive member l2~ This records a modulated
electrostatic latent image on photoconductive member 12.
Copy contrast may be adjusted by regulating the aperture
of lens 20. Moreover, the spacing between screen 10 and
the surface of photoconductive member 12 may also be
regulated to further improve contrast, In addition,
the distance between lens 20 and photoconductive member
12 also controls contrast, as well as magnification.
Finally, the screen may be a glass cross line screen
and the periodicity of the cross lines effects contrast.

/0

/2

Volume 1 Number 7 July 1976 61

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

Page 2 of 2

62 XEROX DISCLOSURE JOURNAL

Volume 1 Number 7 July 1976

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