Light pipe and polarized-light source
US6952310B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 2000 |
| Grant date | Oct 4, 2005 |
| Priority date | — |
| Expiry date | May 11, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0051
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light pipe is obtained by laminating on one or both surfaces of a light-transmitting resin plate a polarized-light scattering plate having fine birefringent domains dispersed therein and hence showing anisotropy in scattering. The polarized-light scattering plate comprises a transparent film having fine domains dispersed therein comprising a liquid crystal polymer which exhibits nematic at temperatures lower than the glass transition temperature of the polymer constituting matrix of the transparent film and has a glass transition temperature of 50° C. or higher. The light pipe as a laminate may further comprise a specular reflection layer, a polarization-retaining lens and a light diffusion layer laminated thereon. The light pipe may further comprise a light source mounted at least on one side face thereof to provide a planar polarized-light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.