Browse Prior Art Database

Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


In an electrophotographic printing machine, a photoconductive belt 10 is entrained about a plurality of spaced rollers 12, 14 and 16. As the sheet of support material 18 passes through the transfer station, a toner powder image is transferred thereto. The toner powder image is permanently affixed to support material 18 at the fusing station. Frequently, it is highly desirable to erase selected portions of the charge formed on belt 10. This may be done by illuminating the photoconductive belt. In various types of transparent photoconductive belts, this illumination mzy be achieved by projecting light rays through the backside of the photoconductive belt onto the photoconductive surf ace. Hereinbefore, single light sources were used to erase different portions of the photoconductive belt. Hence, a plurality of light sources were required. As shown in the figure, a single light source 20 may be disposed within housing 24. Light pipes 22 extend from housing 24 to selected portions of photoconductive belt 10. The light pipes direct the light rays from a common light source or lamp 20 onto these portions so as to erase selected portions of the charge deposited thereon. For example, image erase may be achieved by