Highstrength discharge lamp with low glare and high efficiency for vehicles
US7550926B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Apr 29, 2004 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Mar 22, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/827
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A high intensity discharge lamp has an arc tube, which is filled with substances for gas discharge. The arc tube includes a bulbous portion. Surrounding the arc tube there is a tubular envelope. The envelope has an enlarged portion, which is similar to the bulbous portion. The distance between the envelope and the outer wall of the arc tube is uniform thereby resulting in uniform temperature distribution on the wall of the arc tube, improved thermal stability, improved luminous and electrical parameters. The lamp reduces the light refraction which occurs between the inner surface of the envelope and the outer surface of the arc tube and also between the two interface of the envelope wall thereby emitting more light and reducing the occurrence of glare.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.