High intensity discharge lamp with coating on arc discharge tube
US4281267A · kind A · utility
16Cited by
8References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 14, 1979 |
| Grant date | Jul 28, 1981 |
| Priority date | — |
| Expiry date | May 14, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/35
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In high intensity discharge lamps, particularly those that are configured to operate in a particular orientation, end coatings are provided which increase the efficacy of the lamp. In one embodiment of the present invention, reflective end coatings are provided exteriorly and at the ends of the discharge tube except for an approximately semicircularly shaped portion through which the optical output of the lamp radiates. The particular coating pattern provided in the present invention reduces the number of internal reflections occurring within the discharge tube and accordingly increases the efficacy of the lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.