Electron tube cathode

Details Electron tube cathode Electron tube cathode

1979-11-20

1981-09-22

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

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

H01J 114, H01J 1906, H01K 104

Patent

active

042912520

ABSTRACT:
An electron tube cathode has a composite suppression layer structure interposed between the base metal and the electron-emitting material to suppress an interface layer formed through the reaction of the base metal with the electron emissive material. The composite layer structure includes a thin layer of Pt or Re and a layer of oxide of Zr and/or Hf. As a result, the formation of the interface layer is prevented so that the useful life of the electron tube cathode is prolonged.

REFERENCES:
patent: 3444416 (1969-05-01), Yoshida et al.
patent: 3553521 (1971-01-01), Bakker et al.
patent: 3580739 (1971-05-01), Hofmann et al.
patent: 3691421 (1972-09-01), Decker et al.
patent: 3745403 (1973-07-01), Misumi
patent: 4019081 (1977-04-01), Buxbaum et al.
patent: 4137476 (1979-01-01), Ishii et al.
patent: 4208208 (1980-06-01), Misumi et al.

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