Full frame flash illumination system utilizing a diffuse...

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

G - Physics

03

C

240/75

G03C 5/08 (2006.01) G03B 27/32 (2006.01) G03G 15/04 (2006.01)

Patent

CA 1123801

-1- ABSTRACT OF THE DISCLOSURE 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, under- goes multiple reflections from the walls resulting in a uniform diffuse illumination of the document. An op- tical 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 illum- ination of the platen area overlying the lamp-blocker mounting.

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