Document imaging system using a three-dimensional relative illum

Details Document imaging system using a three-dimensional relative illum Document imaging system using a three-dimensional relative illum

1986-04-18

1987-03-31

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 67, G03B 2772

Patent

active

046539018

ABSTRACT:
A three-dimensional, relative illumination corrector is positioned in a document imaging system so as to compensate for the cos 4 illumination falloff effect at the center field angles. The corrector is positioned at either the image or the object side of the system projection lens. In a first embodiment, the corrector is a generally conical, solid body. In a second embodiment, the corrector interior is hollow to permit a higher level of on-axis illumination.

REFERENCES:
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patent: 3504960 (1970-04-01), Harper
patent: 3561867 (1971-02-01), Simmon
patent: 3669538 (1972-06-01), Fowler
patent: 3777135 (1973-12-01), Rees
patent: 4172658 (1979-10-01), Tani et al.
patent: 4298274 (1981-11-01), Rees et al.
patent: 4445774 (1984-05-01), Spinelli et al.

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