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AN ELECTROPHOTOGRAPHIC PRINTING MACHINE

IP.com Disclosure Number: IPCOM000024943D
Original Publication Date: 1983-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 271K

Publishing Venue

Xerox Disclosure Journal

Abstract

As shown in the drawing, the electrophotographic printing machine employs a transparent or semi-transparent drum, indicated generally by the reference num-eral 10. Drum 10 rotates in the direction of arrow 14 to pass through the various processing stations disposed thereabout. By way of example, drum 10 may comprise a transparent or semi-transparent supporting layer, a photoconductive layer and a transparent insulating layer. Photoconductive layer 12 may have a screen pattern formed thereon. Screen 16 comprises dielectric or conductive materials secured to the free surface of photoconductive layer 12. The screen is of a selected color to attenuate light rays over a preselected bandwidth with light rays outside that bandwidth remaining unattenuated.

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AN ELECTROPHOTOGRAPHIC PRINTING Proposed Classification MACHINE U.S. CI. 118/644
L. F. Bean Int. CI. B05b 5/02

As shown in the drawing, the electrophotographic printing machine employs a transparent or semi-transparent drum, indicated generally by the reference num- eral 10. Drum 10 rotates in the direction of arrow 14 to pass through the various processing stations disposed thereabout. By way of example, drum 10 may comprise a transparent or semi-transparent supporting layer, a photoconductive layer and a transparent insulating layer. Photoconductive layer 12 may have a screen pattern formed thereon. Screen 16 comprises dielectric or conductive materials secured to the free surface of photoconductive layer 12. The screen is of a selected color to attenuate light rays over a preselected bandwidth with light rays outside that bandwidth remaining unattenuated.

Drum 10 advances a portion thereof beneath charging station A. At charging station A, a corona generating device 20 charges photoconductive surface 12 of drum 10 to a relatively high potential. Screen 16 insures that a nonuniform charge potential is recorded thereon.

Volume 8 Number 1 January/February 1983 1

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AN ELECTROPHOTOGRAPHIC PRINTING MACHINE (Cont'd)

The nonuniform charge pattern formed on photoconductive surface 12 is advanced through exposure station B. At exposure station B, an original document is positioned facedown upon drum 10 by means of rollers 22 and continuous belt 24. At least one of the rollers 22 is driven by a motor, not shown. Drum 10 and belt 24 can be driven either continuously or in a step fashion depending upon the design characteristics and logic of the particular device. Exposure station B includes light source 26 positioned interiorly of drum 10. Light rays 28 pass through the imaging member and are reflected from the original document, discharging the nonuniform charge pattern formed on photoconductive layer 12 of drum 10 in image configur- ation to establish a nonuniform charge pattern in image configuration, i.e., an electrostatic latent image. Screen 16 is made of a selected color adapted to optically filter light rays transmitted therethrough over a preselected bandwidth. The light image of the original document extends over a wide bandwidth. The selected color of screen 16 is such as to substantially attenuate the light image passing therethrough onto the photoconductive surface. The light rays initially transmitted from the interior of drum 10 onto the original document are atten- uated. The resultant light rays transmitted back to the photoconductive layer are once again attenuated by screen 16.

The nonuniform electrostatic latent image recorded on photoconductive surface 12 is next advanced to erase station C. At erase station C, a light source 30 transmits light rays onto selected charged portions of photoconductive surface 12. These light rays selectively discharge the p...