0016555-A1 is referenced by 4 patents and cites 6 patents.

A full-frame flash illumination system for a document copying machine including an optical cavity (10) having interior walls coated with a white, diffusely reflecting material. One end (20) of the cavity contains a platen (24) for positioning a document to be copied while the opposing end (30) contains a lens (34) for forming an image of the document on a light sensitive image plane (36). Illumination from a single flash illumination source (42) located within the cavity, undergoes multiple reflecions from the walls resulting in a uniform diffuse illumination of the document.

Title
Full-frame flash illumination system for a document copying machine.
Application Number
EP19800300569 19800226
Publication Number
0016555 (A1)
Application Date
February 26, 1980
Publication Date
October 1, 1980
Inventor
Green Frederick A
Simpson George R
Durbin John A
James D Rees
Avery Stephen T
Assignee
Xerox
US
IPC
G03B 27/54
G03B 15/05
G03G 15/04
G03G 15/04
G03B 27/54
G03B 15/05
G03G 15/04
G03B 27/54
G03B 15/05
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