Dispenser cathode and manufacturing method therefor

Details Dispenser cathode and manufacturing method therefor Dispenser cathode and manufacturing method therefor

1989-11-03

1991-01-01

O'Shea, Sandra L.

Electric lamp and discharge devices

Electrode and shield structures

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

H01J 1906

Patent

active

049821334

ABSTRACT:
A cavity reservoir type dispenser cathode includes a first pellet, a second pellet, a cup and a sleeve, the first pellet being made by sintering a mixture of at least one metal selected from among W, Mo, Ta and alloys thereof, at least one metal selected from among Os, Ir, Ru, Re and alloys thereof, and Sc.sub.2 O.sub.3, the second pellet being made of a mixture of barium-calcium aluminate and In.sub.2 O.sub.3, the first and second pellets being inserted into a cup and the cup being inserted into and welded to a sleeve. The cavity reservoir type dispenser cathode of the present invention has a high saturation current density at lowered temperatures to prevent deformations and shortening of life expectancy of nearby components due to a high operating temperature.

REFERENCES:
patent: 4310603 (1982-01-01), Falce
patent: 4594220 (1986-06-01), Haskes et al.
patent: 4671777 (1987-06-01), van Esdonk et al.
patent: 4737679 (1988-04-01), Yamamoto et al.
patent: 4823044 (1989-04-01), Falce

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