System for enhanced light uniformity in a document scanner...

Details System for enhanced light uniformity in a document scanner... System for enhanced light uniformity in a document scanner...

H - Electricity

04

N

350/15

H04N 1/028 (2006.01) H04N 1/029 (2006.01)

Patent

CA 1129988

Abstract of the Disclosure A system is disclosed in which a light beam from a light source is scanned over the surface of a document to be copied which is located at a nominal document position within the system. Light from the light beam is retro-scattered by the document, collected by a lens system and focused upon a detector. The intensity of the light impinging upon the detector is indicative of informa- tion contained upon the portion of the surface of the document being scanned. The system further includes aperture stops for limiting the solid angle of collection of retro-scattered light from a first position beyond the nominal document position from the lens system to a first predetermined angular value and for limiting the solid angle of collection of retro-scattered light from a second position between the nominal document position and the lens system to a second predetermined angular value.

354065

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