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Copier Machine Illumination Package

IP.com Disclosure Number: IPCOM000085972D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Roberts, DJ: AUTHOR

Abstract

This is a reflector mask to be used in the illumination system of an electrophotographic copy machine to redistribute light and provide additional system efficiency.

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Copier Machine Illumination Package

This is a reflector mask to be used in the illumination system of an electrophotographic copy machine to redistribute light and provide additional system efficiency.

Fig. 1 shows the major components of an illumination system including a lamp 10, an elliptical reflector 11, a dichroic mirror 12 for separating the IR rays from the visible spectrum, a document glass and a first mirror 13. A reflector mask 14 is mounted as shown.

Fig. 2 shows a front view of a portion of the system to illustrate the shape of reflector mask 14. This view also shows the cylindroid nature of the elliptical reflector 11 and the cylindrical nature of the filament in the lamp 10.

The lamp filament is placed along the focal line of the elliptical reflector 11 and ray 15 (Fig. 1) is shown emanating from the filament, striking reflector mask 14 and returning to the filament. Thus, the light is reradiated until its path is similar to that of ray 16 - not striking reflector mask 14.

The advantage of the mask 14 is that light rays which would be directed to the center of the document on the document glass are captured and redirected to the edges of the document glass, where normal light intensity is not as great. By proper selection of the shape of mask 14 and the proper design of system geometry, the light may be made uniform over the entire illuminated surface.

Note that if the mask 14 is placed along the minor axis of the ellipse, the mask may be a plane s...