Browse Prior Art Database

LIGHT PIPE PHOTORECEPTOR ERASE SYSTEM

IP.com Disclosure Number: IPCOM000024398D
Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 3 page(s) / 128K

Publishing Venue

Xerox Disclosure Journal

Abstract

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

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 56% of the total text.

Page 1 of 3

XEROX DISCLOSURE JOURNAL

LIGHT PIPE PHOTORECEPTOR ERASE SYSTEM - ~

Edward C. Mutschler

Proposed Classification
U.S. C1. 430/494 Int. CI. G03c 5/04

I 1 .. .. b,l

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

Volume 5 Number 3 May/June 1980 339

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

Page 2 of 3

LIGHT PIPE PHOTORECEPTOR ERASE SYSTEM (Cont'd)

directing light rays onto the photoconductive belt after the exposure station. In addition, transfer may be improved by reducing the charge of the photoconductive belt causing the toner particles to adhere thereto by illuminating the photo- conductive belt after the development station. Finally, cleaning may be significantly improved by directing light rays onto the photoconductive belt of the cleaning station. Hence, a plurality of light pipes associated with a single light...