Metal halide lamp
US4808876A · kind A · utility
17Cited by
10References
48Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1986 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Feb 4, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/827
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A metal halide discharge lamp includes an arc tube design having a particular end shape which allows control of the temperature distribution within the arc tube, so that sensitivity of the arc tube performance to orientation is reduced and concentration of the metallic halide components in the arc region is maintained relatively constant. The shaping of the arc tube ends and the use of a low thermal emissivity coating on the arc tube allows maintenance of the metallic halide in the vapor state at a constant level to promote better lumen maintenance and color rendering in a metal halide discharge lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.