Illumination system utilizing a document platen with a diffusely

Details Illumination system utilizing a document platen with a diffusely Illumination system utilizing a document platen with a diffusely

1986-10-17

1988-03-01

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355113, 355 52, 355 75, G03B 2772

Patent

active

047289945

ABSTRACT:
An illumination housing includes a glass platen for supporting a document, the platen having at least one surface area uniformly roughened. In one embodiment, both surfaces are uniformly roughened by an etching process. The surface of the platen are thus rendered diffusely reflective to specular hot or cold light spots formed by light reflected from optical components within the illumination system and compensates for platen-derived specular reflections into the projection lens.

REFERENCES:
patent: 3697177 (1972-10-01), Booth
patent: 3957370 (1976-05-01), Vola
patent: 4194831 (1980-03-01), Hartwig et al.
patent: 4194835 (1980-03-01), Shiode
patent: 4466734 (1984-10-01), Rees
patent: 4533979 (1985-08-01), Rees et al.

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