System for enhanced light uniformity in a document scanning syst

Details System for enhanced light uniformity in a document scanning syst System for enhanced light uniformity in a document scanning syst

1979-08-13

1981-06-30

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 71, G03B 2752, G03B 2780

Patent

active

042759609

ABSTRACT:
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 information 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.

REFERENCES:
patent: 3698815 (1972-10-01), Thomas
patent: 4067640 (1978-01-01), Shogren

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