Light directing film having variable height structured surface and light directing article constructed therefrom
US5771328A · kind A · utility
297Cited by
36References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1997 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | Apr 3, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S385/901
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light directing film including a first surface and a second structured surface. The structured surface includes a repeating pattern of prism zones including at least a first zone having a plurality of prism elements with peaks disposed at a first distance from a reference plane and a second zone having a plurality of prism elements with peaks disposed less than the first distance from a reference plane. The width of the first zone preferably measures less than about 300 microns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.