Emission materials for discharge lamps and method for manufacturing electrode structures with such materials
US5744905A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1997 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Aug 19, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/142
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention is directed to new electrode structures for use in fluorescent lamps in which a tungsten base structure is provided with electron emissive materials including one or more of barium titanate, barium zirconate, barium strontium zirconate, barium cerium oxide, barium tantalate, and barium strontium yittrium oxide. Amounts of MgO may be added to improve or change emitter properties. A composite electrode structure can be formed by way of coating a tungsten coil with a slurry of this material, or providing powdered mixtures of both the electron emissive material and tungsten material and sintering this powdered material into a high density composite electrode structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.