Discharge lamp with end of life arc extinguishing structure
US6380676B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Jan 3, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/72
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A discharge lamp comprises a discharge tube having discharge electrodes (10) at both ends thereof. Two lead wires (8) are connected to each of said electrodes (10) that lead to the outside atmosphere from the inside of the discharge tube. The discharge tube contains a fill as an arc discharge generating and sustaining medium. A tungsten coil (14) is connected to at least one lead wire (8) of at least one electrode (10) and placed adjacent to said electrode (10). At least one material selected from the group consisting of calcium carbonate, barium carbonate and strontium carbonate is applied to the inside and the surface of the tungsten coil (14).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.