Ceramic cathode fluorescent discharge lamp
US5982088A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Nov 13, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/78
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ceramic cathode fluorescent discharge lamp is provided including a pair of electrodes, a bulb plated with a fluorescent body on an inner surface of same, at least one of said pair of electrodes being a ceramic cathode having a bottomed cylindrical housing including an electron emission material of an aggregate type porous structure of conductive oxide having a first component consisting of at least one of Ba, Sr, and Ca, a second component consisting of at least one of Zr and Ti, and a third component consisting of at least one of Ta and Nb, said aggregate type porous structure having a surface plated with a conductive or semiconductive layer of at least one of carbide, nitride and oxide of Ta or Nb, rare gas being sealed in said bulb, and sealing pressure of said rare gas being in the range between 10 Torr and 170 Torr.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.