High-pressure discharge lamp, high-pressure discharge lamp lighting device and automotive headlamp apparatus
US7242144B2 · kind B2 · utility
1Cited by
5References
6Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Sep 26, 2002 |
| Grant date | Jul 10, 2007 |
| Priority date | — |
| Expiry date | Nov 15, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/84
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides a high-pressure discharge lamp that uses substantially no mercury and reduces discharge flicker. The high-pressure discharge lamp is kept on with a lamp power of 50 W or lower in a stable state, and the temperature T (° C.) of the electrode at a point at a distance of 0.3 mm from the tip end to the base end in the stable state and the amount A (mol/cc) of free iodine produced when the lamp is turned off after 100 hours of on-time satisfy the formula (1):T2/A>1011.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.