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METHOD TO CLEAN THE ENTRANCE APERTURE OF A LIGHT COLLECTOR ROD

IP.com Disclosure Number: IPCOM000024652D
Original Publication Date: 1981-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 90K

Publishing Venue

Xerox Disclosure Journal

Abstract

A multi mode copier of the electrostatic type operates in a first or COPY mode to produce copies through exposure of document originals on a transparent platen, in a second or WRITE mode to produce copies through exposure of the copier photo-receptor by a flying spot beam modulated in accordance with a video signal input, and in a third or READ mode to read images developed on the photoreceptor using the same flying spot scanner. For operation in the READ mode, a light collecting rod 5 of glass or similar transparent or translucent material is positioned adjacent the copier photoreceptor 6. The exterior of rod 5 is covered or clad by an opaque material 7 having an aperture 8 therein through which light reflected from the photoreceptor 6 scanning thereof enters and is captured in the collecting rod 5 when operating in the READ mode. The captured light is guided or transmitted to a photosensitive device located at either or both ends of the collecting rod. The photosensitive device or devices senses light intensity fluctuations created by the scanning light beam.

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XEROX DISCLOSURE JOURNAL

METHOD TO CLEAN THE ENTRANCE APERTURE OF A LIGHT COLLECTOR ROD
John A. Ritter

Proposed Classification
U.S. Cl. 358/285

Int. C1. H04n 1/04

A multi mode copier of the electrostatic type operates in a first or COPY mode to produce copies through exposure of document originals on a transparent platen, in a second or WRITE mode to produce copies through exposure of the copier photo- receptor by a flying spot beam modulated in accordance with a video signal input, and in a third or READ mode to read images developed on the photoreceptor using the same flying spot scanner. For operation in the READ mode, a light collecting rod 5 of glass or similar transparent or translucent material is positioned adjacent the copier photoreceptor 6. The exterior of rod 5 is covered or clad by an opaque material 7 having an aperture 8 therein through which light reflected from the photoreceptor 6 scanning thereof enters and is captured in the collecting rod 5 when operating in the READ mode. The captured light is guided or transmitted to a photosensitive device located at either or both ends of the collecting rod. The photosensitive device or devices senses light intensity fluctuations created by the scanning light beam.

However, a problem arises when light reflected from the photoreceptor is inter- fered with before reaching the photosensitive device or devices of the collecting rod. One such source of interference is caused by contamination of the entrance aperture 8 to the collecting rod with toner particles. This is poss...