04906070 is referenced by 167 patents and cites 23 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 prisms 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
4906070
Application Date
July 12, 1988
Publication Date
March 6, 1990
Inventor
Sanford Cobb Jr
St. Mary's Point
MN, US
Agent
Stephen W Buckingham
Walter N Kirn
Donald M Sell
Assignee
Minnesota Mining and Manufacturing Company
MN, US
IPC
G02B 5/136
G02B 5/124
G02B 5/04
View Original Source