Metal halide lamp with improved getter orientation
US6586878B1 · kind B1 · utility
7Cited by
7References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1999 |
| Grant date | Jul 1, 2003 |
| Priority date | — |
| Expiry date | Dec 16, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A metal halide discharge lamp has an ellipsoidal outer envelope with a quartz glass arc tube on its major axis supported by a frame having metal straps engaging pinched ends of the arc tube, which lie in a common pinch plane. An inert gas fill between the arc tube and the envelope establishes convection flow patterns during operation. Getters in the form of strips of ZrAl alloy are welded to the straps at 45° to the pinch plane on opposite sides thereof. The getter orientation improves absorption of impurities during horizontal lamp orientation, so that hydrogen spikes and other problems are eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.