Quartz metal halide lamp with improved lumen maintenance
US7786674B2 · kind B2 · utility
1Cited by
4References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 2, 2005 |
| Grant date | Aug 31, 2010 |
| Priority date | — |
| Expiry date | May 30, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/125
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A quartz metal halide lamp includes an outer sealed envelope defining an interior space, and an arc tube disposed in the interior space. The arc tube has a fill space. A chemical fill is disposed in the fill space. The chemical fill includes sodium halide and lanthanide halide, with the lanthanide halide selected from the group consisting of europium iodide, europium bromide, praseodymium iodide, praseodymium bromide, ytterbium iodide, ytterbium bromide and combinations thereof. The lanthanide halide is between 2 and 6 weight percent of the chemical fill. Electrodes are partially disposed within the fill space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.