Cathode for electron tube

Details Cathode for electron tube Cathode for electron tube

1996-11-07

1999-11-09

Patel, Ashok

Electric lamp and discharge devices

Electrode and shield structures

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

313337, 313270, H01J 113

Patent

active

059820837

ABSTRACT:
A cathode for an electron tube includes a layer of a electron emitting substance containing alkaline earth metal oxides containing 0.01--20.0 wt % of both a lanthanum compound and a magnesium compound or a lanthanum-magnesium compound disposed on a base metal including nickel as a major component and tungsten as a minor component. The tungsten prevents embrittlement and ensures a continuing supply of fill barium in the electron-emitting substance. The cathode enjoys full interchangeability with the conventional oxide cathode and a 15-30% longer life span.

REFERENCES:
patent: 3436584 (1969-04-01), Hughes et al.
patent: 4017808 (1977-04-01), Fein et al.
patent: 4073989 (1978-02-01), Wainer
patent: 4797593 (1989-01-01), Saito et al.
patent: 5030879 (1991-07-01), Derks
patent: 5066885 (1991-11-01), Morimoto et al.
patent: 5146131 (1992-09-01), Derks
patent: 5348934 (1994-09-01), Shaw

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