Browse Prior Art Database

MULTI-FUNCTION OPTICAL-CHARGING SUBSYSTEM

IP.com Disclosure Number: IPCOM000024964D
Original Publication Date: 1983-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 74K

Publishing Venue

Xerox Disclosure Journal

Abstract

An optical-charging system for a copier, shown in cross-section in the figure, combines the function of exposure, precharge erase and charge in a single integrated subsystem. An illuminator, consisting of a set of miniature tungsten lamps 1 in a diffuse cylinder 9, illuminates a document (not shown) lying on a platen 2. Curved reflector 3 redirects a portion of the light to a scan strip on the underside of the platen. Light reflected from the document is focused by a gradient index lens array 4 onto a photoconductor plane 5. A light pipe 6 is positioned so as to direct a portion of the light emanating from lamp I to photoconductor 5 for the purpose of erasing any recorded charge. A pin corotron unit 7, charges the photoconductor at a point just before the exposure zone. Provision is also made to direct air by a blower 8 between the lamp and the lens array to reduce heating effects.

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MULTI-FUNCTION OPTICAL-CHARGING Proposed Classification SUBSYSTEM U.S. CI. 355/8
John A. Durbin Int. C1. G03g 15/28 Dale R. Troendle
William L. Lama
David P. Wind
James D. Rees

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An optical-charging system for a copier, shown in cross-section in the figure, combines the function of exposure, precharge erase and charge in a single integrated subsystem. An illuminator, consisting of a set of miniature tungsten lamps 1 in a diffuse cylinder 9, illuminates a document (not shown) lying on a platen 2. Curved reflector 3 redirects a portion of the light to a scan strip on the underside of the platen. Light reflected from the document is focused by a gradient index lens array 4 onto a photoconductor plane 5. A light pipe 6 is positioned so as to direct a portion of the light emanating from lamp I to photoconductor 5 for the purpose of erasing any recorded charge. A pin corotron unit 7, charges the photoconductor at a point just before the exposure zone. Provision is also made to direct air by a blower 8 between the lamp and the lens array to reduce heating effects.

In a preferred embodiment, lamp 1 comprises eight 12V automobile lamps in a 1" diameter diffuse integrating cavity. Electrical contact is made, in series, through conductive strips between the lamps. The spacing of the lamps can be chosen to provide an even illumination at platen 2 or some inverse profile depending on the type o...