Illumination device comprising a light guide
US8292467B2 · kind B2 · utility
29Cited by
10References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 2009 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | May 25, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0038
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention provides an illumination device (1) comprising a lighting unit (2). The lighting unit (2) comprises a light source (100) and a substantially flat light guide (200), arranged to collimate light source light (111). The light guide (200) has an entrance window (210), an edge window (220), a first light guide surface (201), a second light guide surface (202), a first side edge (230) and a second side edge (240). One or more of the first light guide surface (201) and the second light guide surface (202) comprise a plurality of grooves (300). In this way, latitudinal collimation is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.