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Browse Prior Art Database

Illumination to Elimination Shadows

IP.com Disclosure Number: IPCOM000077337D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Bersot, JD: AUTHOR [+3]

Abstract

A reflector design for the illumination system of a copy machine utilizes an auxiliary reflector or reflectors to eliminate or reduce the shadows at the document plane 10. The illumination scheme utilizes an elliptical reflector 11 and a cold mirror 12.

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Illumination to Elimination Shadows

A reflector design for the illumination system of a copy machine utilizes an auxiliary reflector or reflectors to eliminate or reduce the shadows at the document plane 10. The illumination scheme utilizes an elliptical reflector 11 and a cold mirror 12.

Auxiliary reflectors 13 and 14 redirect the light rays, such that they strike the document plane 10 from the direction opposite to the direction from which they would have arrived if not deflected. Reflector 14 intercepts only that light which would not normally hit elliptical reflector 11. The light from auxiliary reflectors arrives at the document plane at an angle opposite to that at which the light from the lower half of the ellipse arrives, thus eliminating the shadows. The direction and spread of the light rays from the auxiliary reflectors are determined by their shape and location.

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