Cathode having a reservoir and method of manufacturing the same

Details Cathode having a reservoir and method of manufacturing the same Cathode having a reservoir and method of manufacturing the same

1996-07-12

1998-11-17

Patel, Ashok

Electric lamp and discharge devices

Electrode and shield structures

Point source cathodes

313346R, 313311, 313351, 313345, 313309, H01J 115

Patent

active

058380965

ABSTRACT:
A cathode includes a hairpin type filament made of a refractory metal such as W, Mo or Re; a single crystal needle, made of a refractory metal such as W, Mo or Re joined to the filament; and a reservoir formed by applying a slurry of a powder of a metal or metal compound and an organic solvent containing nitrocellulose in the vicinity of a junction between the single crystal needle and the filament. The powder for a reservoir is made of a metal lower than the single crystal needle in a work function or electron affinity, such as Ti, Zr, Hf, Y, Th, Sc or Se, or a compound thereof.

REFERENCES:
patent: 3356887 (1967-12-01), Heil et al.
patent: 3814975 (1974-06-01), Wolfe et al.
patent: 4055780 (1977-10-01), Kawai et al.
patent: 4143292 (1979-03-01), Hosoki et al.
patent: 4210988 (1980-07-01), Turnbull et al.
patent: 4258283 (1981-03-01), Brunger et al.
patent: 5449968 (1995-09-01), Terui et al.
patent: 5536944 (1996-07-01), Tsunoda et al.
patent: 5616926 (1997-04-01), Shinada et al.

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