Arc tube and high pressure discharge lamp including same
US5001396A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1989 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | Oct 11, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/363
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An arc tube including a tubular ceramic envelope; a chemical fill within the envelope; a seal button at each end of the envelope, the seal button having an aperture therethrough for receiving a feedthrough member; a feedthrough member having an electrode projecting therefrom passing through the seal button aperture and being oriented such that the electrode projects into the tubular ceramic envelope; frit material sealing the seal buttons into the ends of the envelope and the feedthrough members into the seal buttons; and means for interrupting the seal interface between the feedthrough member and the frit material around the total circumference of at least a portion of the feedthrough member. In a preferred embodiment of the present invention, the means for interrupting the seal interface includes a coating disposed around the periphery, or circumference, of the feedthrough member. Such coating comprises a material, most preferably a metal or metal alloy, which is inert to reaction with said frit material, the feedthrough member, and the fill gas components and which has a thermal expansion properties compatible with the thermal expansion properties of both the feedthrough member …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.