Directly heated cathode structure

Details Directly heated cathode structure Directly heated cathode structure

1995-12-13

1997-12-30

O'Shea, Sandra L.

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313346DC, H01J 1906

Patent

active

057034290

ABSTRACT:
A directly heated cathode structure includes a porous pellet impregnated with an electron radiating material, a cup-shaped container holding the porous pellet, a metal member welded to the container, and a filament between the container and the metal member, restricting thermionic emission through the base and sides of the pellet and extending the life of the cathode structure.

REFERENCES:
patent: 3495122 (1970-02-01), Hubner et al.
patent: 3671792 (1972-06-01), Waltermire
patent: 4350920 (1982-09-01), Bertens
patent: 4823044 (1989-04-01), Falce
patent: 5171180 (1992-12-01), Lee

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