Surface light source device
US5584556A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1992 |
| Grant date | Dec 17, 1996 |
| Priority date | — |
| Expiry date | Nov 30, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S385/901
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A surface light source device which comprises a light-conducting member consisting of a sheet of transparent material, a linear light source disposed adjacent to an edge surface of the light-conducting member, a diffusion plate disposed on a front surface of the light-conducting member and a reflective plate disposed on a rear side of the light-conducting member. The rear surface of the light-conducting member has depressions or projections. These depressions or projections have rough surfaces. By selecting the shape of the depressions or projections, and controlling the roughness of the rough surfaces, an enhanced uniform brightness distribution is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.