Surface light source device
US5134549A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1991 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Mar 11, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F2013/1813
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A surface light source device comprising a linear light source, a light transmitting member having an end surface of incidence located in the vicinity of the light source, a diffusing plate arranged on the front surface of the light transmitting member and a reflecting plate arranged on the rear surface of the light transmitting member; pattens formed as portions having diffusing functions being arranged on the rear surface of the light transmitting member, and the portions having the diffusing function being sparse in area in the vicinity of the center of the end surface of incidence and becoming denser as the portions are farther from the end surface of incidence. The surface light source device is adapted so as to uniformalize luminance on the diffusing plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.