METHOD TO CLEAN THE ENTRANCE APERTURE OF A LIGHT COLLECTOR ROD
Original Publication Date: 1981-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
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.