Surface light source device of side light type
US6280043A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | May 6, 1998 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | May 6, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0038
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A surface light source device of side light type has a scattering guide plate, a primary light source, a reflection sheet and a prism sheet. An emission surface of the guide plate provides a light control surface. The light control surface has many fine projections approximately perpendicular to an incidence surface or inclined by a small angle with respect to the incidence surface. In each of the projections, dullness varying in accordance with position on the emission surface is given to a slope-couple including a pair of slopes produce a uniform emitting intensity from the emission surface. A back surface of the guide plate may provide a light control surface so that dullness varying in accordance with position is given to slope-couples.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.