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Copier Illumination Apparatus

IP.com Disclosure Number: IPCOM000088584D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Maddox, RA: AUTHOR

Abstract

This small size illumination apparatus is constructed and arranged to collect and concentrate a large amount of light into a much longer narrow footprint of light which illuminates an original document.

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Copier Illumination Apparatus

This small size illumination apparatus is constructed and arranged to collect and concentrate a large amount of light into a much longer narrow footprint of light which illuminates an original document.

Fig. 1, a side view of the illumination apparatus, shows a short filament lamp 10 mounted at the focal point of a short elliptical reflector 11. Document glass 12 is located at the other focal point of the ellipse. The distance between the reflector and the document glass has been shortened in Fig. 1 for convenience. The document glass is adapted to support an original document (not shown). This document is scanned as the reflector and light source move parallel to the glass, in the scan direction represented by arrow 13. The scan distance, which covers the length dimension of the original document, may be from 1d to 14 inches.

Fig. 2 shows the orthogonal view of document glass 12, wherein the width dimension of the document, for example, 8 112 inches, is viewed. Lamp 10 is seen to be relatively short, for example, 2 to 3 inches long.

Hyperbolic end mirrors 14 and 15 are joined to the ends of the elliptical reflector seen in Fig. 1 such that the center of lamp 10 is at one focus of each end mirror. Thus, image filaments are generated at the other focus of these end mirrors, as at 16 and 17. As a result, the scanning light footprint which scans the original document appears to originate at three short filament lamps, and the illuminati...