Browse Prior Art Database

Erase Systems for Copiers Using a Document Feeder With Fixed Optics

IP.com Disclosure Number: IPCOM000047169D
Original Publication Date: 1983-Oct-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Barkley, JA: AUTHOR [+2]

Abstract

Edge stripes on copy sheets in copiers using moving documents and fixed optic scanners with reflective backing at the optic window are removed by incorporating positive light sources in overlapping relationship to the document edges at the scan window. Fig. 1 shows the elements associated with the scanning of an original document 10 at scan window 12. As the document passes transparent plate 12, lamps 14 and 15 illuminate the document and also produce light from reflective surface 16 of upper frame housing 18. The light ultimately is transferred through a fiber-optic array 20, or the like, to a photoconductive surface for development and image transfer as is conventional. A system somewhat similar to Fig. 1 is shown in [*].

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Erase Systems for Copiers Using a Document Feeder With Fixed Optics

Edge stripes on copy sheets in copiers using moving documents and fixed optic scanners with reflective backing at the optic window are removed by incorporating positive light sources in overlapping relationship to the document edges at the scan window. Fig. 1 shows the elements associated with the scanning of an original document 10 at scan window 12. As the document passes transparent plate 12, lamps 14 and 15 illuminate the document and also produce light from reflective surface 16 of upper frame housing 18. The light ultimately is transferred through a fiber-optic array 20, or the like, to a photoconductive surface for development and image transfer as is conventional. A system somewhat similar to Fig. 1 is shown in [*]. In such systems, document 10 moves past stationary optics 20 in a manner that leaves an air gap between reflective surface 16 and document 10 so that document 10 moves freely without binding. As shown in Fig. 2, the air gap allows the casting of a shadow, shown generally at 25, on reflective surface 16. This shadow occurs on both sides of document 10. Unless copy paper is perfectly aligned with the image on the photoconductor (not shown), one or both of these shadows appear as a line along the edge of the copy sheet. Erase systems that eliminate the shadow problem are provided by placing a light source behind paper 10, thereby using a positively generated light for the erase f...