Multiple filament lamp having wire grid to provide filament redundancy
US4553066A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1983 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Aug 8, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K1/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A multi-filament lamp that includes a tubular envelope having a pinch seal at one end thereof and containing therein a halogen atmosphere. At least two coiled tungsten filaments are disposed in the tubular envelope and are supported so as to be oriented parallel to each other in the longitudinal direction of the envelope. Lead-in wires are provided within the envelope and are hermetically sealed using metal foil strips, these being hermetically sealed within the pinch seal. Outer lead-in wires extend from the pinch seal and are each connected to a respective contact pin. A lead-in wire is associated with each filament and a common lead-in wire is also provided. A wire grid extends longitudinally within the envelope substantially in parallel to the filaments and is disposed therebetween so as to isolate one filament from the other and thereby provide filament redundancy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.