Full frame flash illumination system utilizing a diffuse integra

Details Full frame flash illumination system utilizing a diffuse integra Full frame flash illumination system utilizing a diffuse integra

1980-01-23

1982-06-08

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2772

Patent

active

043337236

ABSTRACT:
An illumination system for a document copying machine including an optical cavity having interior walls coated with a white, diffusely reflecting material. One end of the cavity contains a platen for positioning a document to be copied while the opposing end contains a lens for forming an image of the document on a light sensitive image plane. Illumination from a single flash illumination source located within the cavity, undergoes multiple reflections from the walls resulting in a uniform diffuse illumination of the document. An optical element is positioned above the lamp to prevent direct light from striking the platen and, in a preferred embodiment, has an aperture therein for increasing illumination of the platen area overlying the lamp-blocker mounting.

REFERENCES:
patent: 3428397 (1969-02-01), Elmer
patent: 3498715 (1970-03-01), Gold
patent: 3586849 (1971-06-01), Starkweather
patent: 3669538 (1972-06-01), Fowler
patent: 3947115 (1976-03-01), Hamaguchi
patent: 3977784 (1976-08-01), Hara
patent: 4089602 (1978-05-01), Noguchi et al.
patent: 4225923 (1980-09-01), Bloemendaal et al.
IBM Technical Disclosure Bulletin, "Illumination to Eliminate Shadows", Bersot et al., vol. 15, No. 2, Jul. 1972, p. 521.

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