Cathode for electron tube having an electron-emission layer incl

Details Cathode for electron tube having an electron-emission layer incl Cathode for electron tube having an electron-emission layer incl

1996-04-10

1998-01-13

Dougherty, Elizabeth L.

Electric lamp and discharge devices

Electrode and shield structures

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

313337, 313270, H01J 113

Patent

active

057083215

ABSTRACT:
A cathode for an electron tube includes a base metal containing nickel as a major component and an electron-emissive material layer which is formed on the base metal and comprises an alkaline earth metal oxide including barium oxide as its main component, wherein the electron-emissive material layer further comprises a lanthanum-magnesium-manganese oxide. The cathode of the present invention is fully interchangeable with conventional oxide cathodes and has a longer lifetimes and an improved cut-off drift characteristic.

REFERENCES:
patent: 4797593 (1989-01-01), Saito et al.
patent: 4885211 (1989-12-01), Tang et al.
patent: 5146131 (1992-09-01), Derks

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