High-efficiency discharge lamp which incorporates a small molar excess of alkali metal halide as compared to scandium halide
US3979624A · kind A · utility
18Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1975 |
| Grant date | Sep 7, 1976 |
| Priority date | — |
| Expiry date | Apr 29, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/125
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
High-intensity arc-discharge (HID) device of the metal-halide additive type incorporates as essential discharge-sustaining constituents mercury and inert ionizable starting gas and also sodium and/or lithium iodides and/or bromides as well as scandium iodide and/or bromide. The molar ratio of alkali metal halide to scandium halide is from about 1.7:1 to about 5:1 and this greatly enhances the device efficacy for the generation of visible light, which can be enhanced by as much as 32 percent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.