Metal halide lamp and lighting device
US7233110B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2004 |
| Grant date | Jun 19, 2007 |
| Priority date | — |
| Expiry date | Oct 12, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/827
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A metal halide lamp comprises a refractory, light-transmitting airtight container defining therein a discharge space with an internal volume of not more than 0.1 cc, electrodes sealed in the container, opposing each other with a distance of not more than 5 mm interposed, and a discharge medium sealed in the container and including a metal halide material and a rare gas. The metal halide includes first and second halide materials. The first halide material contains scandium (Sc) and sodium (Na) halides. The second halide material contains at least one of indium (In) and zinc (Zn) halides. The discharge medium contains substantially no mercury. The load on the wall of the container in a stable state is 50 W/cm2 or more. A/B≦0.21 where A represents the intensity of an impurity chromium (Cr) spectrum in lighting spectra, and B represents the intensity of a scandium (Sc) spectrum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.