Dispenser cathode

Details Dispenser cathode Dispenser cathode

1990-11-07

1992-06-30

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

051266229

ABSTRACT:
A dispenser cathode comprises an electron emissive material including at least one selected from the group consisting of Ba and Ba oxide, a porous metal base body having a plurality of diffusing cavities and positioned on the electron emissive material and an alloy thin film layer consisting of scandium tungstate and tungsten which is disposed between the electron emissive material and the porous metal base body. Instead of the alloy thin film, a pellet containing scandium tungstate may be interposed between said electron emissive material and the porous metal base body. The activation aging time of the dispenser cathode of the present invention is greatly shortened as compared with the conventional dispenser cathode, and the damage of Sc by ion bombardment is prevented, and thus the stable thermoelectron emission can be obtained.

REFERENCES:
patent: 4783613 (1988-11-01), Yamamoto et al.
patent: 4823044 (1989-04-01), Falce

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