Browse Prior Art Database

Original Publication Date: 1983-Feb-28
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


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.