04791540 is referenced by 155 patents and cites 5 patents.

A light fixture providing normalized output. An undirected light source is located in an optical cavity having an optical window. A film with a smooth surface and a structured surface is placed in the optical window with the smooth surface facing the interior of the optical cavity. The structured surface has a plurality of triangular prisms thereon.

Title
Light fixture providing normalized output
Application Number
7/53848
Publication Number
4791540
Application Date
May 26, 1987
Publication Date
December 13, 1988
Inventor
Neal T Strand
St. Paul
MN, US
John F Dreyer Jr
St. Paul
MN, US
Agent
Stephen W Buckingham
Donald M Sell
Assignee
Minnesota Mining and Manufacturing Company
MN, US
IPC
F21V 5/02
View Original Source