Browse Prior Art Database

COLOR RASTER INPUT SCANNER USING VACUUM FLUORESCENT LAMPS

IP.com Disclosure Number: IPCOM000025440D
Original Publication Date: 1985-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 65K

Publishing Venue

Xerox Disclosure Journal

Abstract

The figure shows a color printing system which uses a multiple phosphor vacuum fluorescent lamp to achieve color separation during raster scanning. A document 10 is placed on a platen 12 which is moved through an exposure zone. A multi-phosphor vacuum fluorescent lamp 14, in conjunction with cylindrical ref lector 16, illuminates a strip at the center of the exposure zone. A reflected line image is projected by lens 18 onto a photosensor array 20. Array 20 comprises a linear array of light sensitive images which, when exposed to an image line, generates signals representative of image density. These signals can then be used to direct. an output marking or printing mechanism.

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XEROX DISCLOSURE JOURNAL

COLOR RASTER INPUT SCANNER USING VACUUM FLUORESCENT LAMPS Ned J. Seachman

Proposed Classification
U.S. CI. 355/67 Int. CI. G03b 27/54

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Volume 10 Number 3 May/June 1985 149

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

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COLOR RASTER INPUT SCANNER USING VACUUM FLUORESCENT LAMPS (Cont'd)

The figure shows a color printing system which uses a multiple phosphor vacuum fluorescent lamp to achieve color separation during raster scanning. A document 10 is placed on a platen 12 which is moved through an exposure zone. A multi- phosphor vacuum fluorescent lamp 14, in conjunction with cylindrical ref lector 16, illuminates a strip at the center of the exposure zone. A reflected line image is projected by lens 18 onto a photosensor array 20. Array 20 comprises a linear array of light sensitive images which, when exposed to an image line, generates signals representative of image density. These signals can then be used to direct. an output marking or printing mechanism.

Lamp 14 comprises an envelope 22, an anode 24, a filament/cathode 26 and three phosphor stripes 28 (red), 30 (green), 32 (blue). A particular phosphor stripe is selected by placing a high accelerating voltage on an associated anode while maintaining the other phosphor anodes at zero or negative potential relative to the cathode. Each successive scan line is exposed to light from only one of the phosphor stripes; the document is eventually scanned and re...