Directly heated cathode for electron tube

Details Directly heated cathode for electron tube Directly heated cathode for electron tube

1979-03-30

1980-09-02

Smith, Alfred E.

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

313346R, H01J 114, H01J 1906

Patent

active

042208912

ABSTRACT:
A directly heated cathode for electron tube having a stable electron emission characteristic and a low cut-off voltage is provided. The cathode comprises a base metal of an alloy consisting essentially of 20-30% by weight of tungsten and a trace amount to 0.25% by weight of zirconium, the balance being nickel, binder dots of metallic nickel powders distributed on a flat part at the front side of the base metal, and a layer of thermoelectron emission oxides laid on the flat part at the front side of the base metal. The layer of thermoelectron emission oxides is in direct contact with the flat part through clearances among the binder dots of the metallic nickel powders.

REFERENCES:
patent: 3374385 (1968-03-01), Lattimer
patent: 4079164 (1978-03-01), Misumi
patent: 4081713 (1978-03-01), Misumi

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