05056892 is referenced by 151 patents and cites 22 patents.

A thin, flexible film made of a transparent polymeric material including a structured surface and an opposite smooth surface, wherein light striking either surface, within certain angular ranges, is totally internally reflected. The structured surface includes a linear array of miniature substantially right angled isosceles prisms arranged side-by-side to form a plurality of peaks and grooves. In addition, the perpendicular sides of the prims make an angle of approximately 45.degree. with the smooth surface, and when the film is curled the smooth surface lies in a smooth continuous arcuate curve without materially affecting the performance of the film. Because of the film's flexibility and its ability to totally internally reflect light, it may be utilized in a variety of ways, for example, as a collector of solar energy or as a light conduit. The performance of the film may be manipulated to permit controlled light leakage.

Title
Totally internally reflecting thin, flexible film
Application Number
819118
Publication Number
5056892
Application Date
January 30, 1990
Publication Date
October 15, 1991
Inventor
Sanford Cobb Jr
St. Mary's Point
MN, US
Agent
Stephen W Buckingham
Walter N Kirn
Gary L Griswold
Assignee
Minnesota Mining and Manufacturing Company
MN, US
IPC
G02B 5/136
G02B 5/124
G02B 5/04
View Original Source