High-intensity discharge lamp
US6563268B2 · kind B2 · utility
4Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2001 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Dec 20, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/542
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A high-intensity discharge lamp includes an arc tube having a pair of main electrodes, a starting circuit having a thermally-actuated switch for disconnecting the starting circuit, and an outer tube for containing the arc tube and the starting circuit, and the lamp is lighted by means of a reactance ballast. The thermally-actuated switch includes an envelope bulb that covers contacts of the thermally-actuated switch. Thereby, occurrence of sustained arc discharge in the outer tube is prevented in the case of a starting failure or a break-off of the arc tube at the end of the lamp's life.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.