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Browse Prior Art Database

Low-Cost Xerographic Printer/Scanner Device

IP.com Disclosure Number: IPCOM000039501D
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 3 page(s) / 51K

Publishing Venue

IBM

Related People

Headrick, MR: AUTHOR [+2]

Abstract

A conventional xerographic laser printer is modified to accommodate laser beam scanning of the toned image from original documents on the photoreceptor surface. The original is fed from a bin that normally holds a copy paper supply and/or traverses the same paper path as sheets receiving print in the printing mode. Printer/scanner 10 (Fig. 1) uses a belt photoconductor 12, which is charged by charge corona 14, and imaged by laser printhead 15 by an image-forming light pattern at imaging area 16. The electrostatic (Image Omitted) image is developed by developer 18, and toner is transferred in the conventional print mode to a copy sheet at transfer station 20 by means of transfer corona 21. The toner is fused to the copy sheet at station 22.

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Low-Cost Xerographic Printer/Scanner Device

A conventional xerographic laser printer is modified to accommodate laser beam scanning of the toned image from original documents on the photoreceptor surface. The original is fed from a bin that normally holds a copy paper supply and/or traverses the same paper path as sheets receiving print in the printing mode. Printer/scanner 10 (Fig. 1) uses a belt photoconductor 12, which is charged by charge corona 14, and imaged by laser printhead 15 by an image- forming light pattern at imaging area 16. The electrostatic

(Image Omitted)

image is developed by developer 18, and toner is transferred in the conventional print mode to a copy sheet at transfer station 20 by means of transfer corona 21. The toner is fused to the copy sheet at station 22. The copy sheet, which originates from supply bin 24, is ultimately deposited in output bin 26. Scanning is obtained by adding a fluorescent lamp 30 at transfer station 20, and a Fresnel lens, or the like, located to collect light reflected from photoconductor 12 from imaging location 16. A photodiode or other detector 28 is located near the point at which the Fresnel lens focuses the collected light. A document for scanning is placed face down in supply bin 24. Photoconductor 12 is charged as it passes beneath charge corona 14, but is not discharged by any light image at 16 since the laser light source 15 is off. Photoconductor 12 is also not developed at the developer 18. Thus, uniformly charge, clean photoconductor approaches transfer station 20. At the appropriate time, the document is fed from the supply bin and brought into contact with the photoconductor at transfer station 20. Fluorescent lamp 30 is turned on as the document passes beneath it while in contact with the uniformly charged photoconductor. In white areas of the document, light from the lamp passes through the document to the photoconductor and discharges the photoconductor. In black areas of the document, light is blocked from reaching the photoconductor and no discharge occurs. Thus, an electrostatic image of the document is formed on photoconductor 12. The document separates from photoconductor 12 and exits from the machine into output bin 26. Charge corona 14 and laser printhead 15 are off so as not to disturb the electrostatic image as it passes beneath charge corona 14 and imaging area 16. The image is then developed by developer 18, but there is no toner transfer at transfer station 20. As the toned image passes image area 16, laser 15 is actuated and scans the image. Where there is no toner, light from laser 15 is specularly reflected from photoconductor 12 through the Fresnel lens and onto the photodiode 28. If there is toner on photoconductor 12, the laser light is absor...