Planar lighting device
US8740440B2 · kind B2 · utility
25Cited by
0References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2012 |
| Grant date | Jun 3, 2014 |
| Priority date | — |
| Expiry date | Nov 24, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0091
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light guide plate has a light guide plate body and at one side thereof a curvedly descending portion formed by curving front and rear surfaces of the light guide plate, with the surface to surface distance kept uniform, to a coaxial arcuate configuration so as to extend towards a direction of a rear surface of the light guide plate body. Spot light sources disposed in face to face relation with a free end face of the curvedly descending portion are arranged to be displaced towards the front surface of the light guide plate from a mid-center plane between the front and rear surfaces of the curvedly descending portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.