Symmetrical light guide structure for LED-based lighting device
US8016473B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2007 |
| Grant date | Sep 13, 2011 |
| Priority date | — |
| Expiry date | Apr 9, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0038
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device (100) for diffusing light comprising a light guide (101), light input means (102), and light output means (103). The light input (102) and light output (103) means are connected to the light guide (101), and the device (100) is arranged to allow light of at least two separate frequencies from a light source (108, 109, 110) to enter the light guide (101) through the light input means (102), propagate through said light guide (101) and exit at the light output means (103). The light guide (101) is circumferential, such that light is allowed to propagate for a distance greater than the external dimensions of said light guide (101) before reaching the output means (103), and hence, producing a mix of the light from said at least two frequencies. A display apparatus in which the invention is implemented is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.