Non-uniform diffuser to scatter light into uniform emission pattern
US9310030B2 · kind B2 · utility
24Cited by
114References
78Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 8, 2010 |
| Grant date | Apr 12, 2016 |
| Priority date | — |
| Expiry date | Nov 2, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/181
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting device comprising a light source and a diffuser spaced from the light source. The lighting device further comprises a wavelength conversion material disposed between the light source and the diffuser and spaced from the light source and the diffuser, wherein the diffuser is shaped such that there are different distances between the diffuser and said conversion material at different emission angles. In other embodiments the diffuser includes areas with different diffusing characteristics. Some lamps are arranged to meet A19 and Energy Star lighting standards.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.