Cathode for an electron gun

Details Cathode for an electron gun Cathode for an electron gun

1998-04-21

2000-10-31

Patel, Ashok

Electric lamp and discharge devices

Electrode and shield structures

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

H01J 120

Patent

active

061407534

ABSTRACT:
The present invention includes a cathode for an electron gun having a base metal mainly composed of nickel and containing one kind of reducing element at least, a metal layer mainly composed of nickel or nickel-zirconium on the upper side of the base metal, and an electron emitting material layer containing alkaline earth metal oxide including barium at least on the upper side of the metal layer. The metal layer is formed by spreading nickel or nickel-zirconium on the base metal and heating it or by adhering nickel or nickel-zirconium powder thereon to have particle smaller than that of the base metal, to increase its life cycle under a high current density load by ensuring a diffusion route of reducing element steadily for good generation of free radical barium atom. In another aspect, the present invention proposes a cathode for an electron gun further having a second electron emitting material layer containing both of lanthanum compound and magnesium compound or lanthanum-magnesium mixed compound in alkaline earth metal oxide containing barium at least on the upper side of the electron emitting material layer.

REFERENCES:
patent: 5118984 (1992-06-01), Saito et al.
patent: 5592043 (1997-01-01), Gartner et al.
patent: 5808404 (1998-09-01), Koizumi et al.

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