Browse Prior Art Database

Copier Illumination System

IP.com Disclosure Number: IPCOM000088585D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Maddox, RA: AUTHOR [+2]

Abstract

The size and cost of this copier illumination system is reduced, while at the same time maintaining high efficiency, by the use of a short, continuous filament light source and its cooperating reflectors, and by the use of apparatus to modify the light radiation pattern so as to provide constant illuminance at the image plane, across the length of a narrow document-illuminating stripe, called a footprint, which footprint is substantially longer than the light source.

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Copier Illumination System

The size and cost of this copier illumination system is reduced, while at the same time maintaining high efficiency, by the use of a short, continuous filament light source and its cooperating reflectors, and by the use of apparatus to modify the light radiation pattern so as to provide constant illuminance at the image plane, across the length of a narrow document-illuminating stripe, called a footprint, which footprint is substantially longer than the light source.

A tungsten halogen lamp 10 (Fig. 1) is used with a reflector to concentrate a large amount of luminous flux into footprint 11. The lamp filament is approximately two inches in length and is positioned at one focus of a reflective elliptic cylinder 12 of substantially the same length. The resulting light is directed to document glass 13 which is located at a folded ellipse focus. Relative movement of the lamp and reflector causes an original document, located on the top side of the document glass, to be lengthwise scanned by this illumination footprint. Such a document is in the range of eight and one-half inches wide, measured normal to scan direction 14.

The document glass is flat. The lamp and reflector move in a line 14 parallel to the document glass. The document glass includes a pair of stationary, elongated, planar reflectors 15 and 16 which are located closely adjacent the underside of the document glass. These two reflectors are spaced apart in the range of eight an...