Metal halide lamp with improved field wire
US6949871B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 2002 |
| Grant date | Sep 27, 2005 |
| Priority date | — |
| Expiry date | Jul 25, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/36
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved discharge lamp is provided which includes a discharge vessel (arc tube) enclosing a discharge space, the discharge vessel (arc tube) including within the discharge space a metal halide ionizable material; first and second discharge electrode feedthroughs, and first and second current conductors connected to the first and second discharge electrode feedthroughs, respectively. The improvement is through the use of a field wire of a material that includes Ni or Ni alloy, and wherein the field wire material exhibits an electrical resistivity at 25° C.<10 ohms/mm2; a photoelectric emission work function>4.0 eV; a thermionic emission work function>4.0 eV; and a melting point>1200° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.