Cathode for electron tube

Details Cathode for electron tube Cathode for electron tube

1986-07-17

1989-01-10

Boudreau, Leo H.

Electric lamp and discharge devices

Electrode and shield structures

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

313355, 252521, H01J 102

Patent

active

047975938

ABSTRACT:
This invention is a cathode of an indirect heated type having improved electron emission characteristics.
A cathode for an electron tube in accordance with the present invention comprises: a base containing Ni as a major element; and a layer of an electron-emissive substance formed on the base, this layer comprising not only alkaline earth metal oxide as a principal component containing at least Ba, but also rare earth metal oxide of 0.1 to 20 wt. % or rare earth metal of 0.05 to 15 wt. %.

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patent: 4007393 (1977-02-01), van Stratum et al.
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patent: 4594220 (1986-06-01), Hasker et al.
patent: 4625142 (1986-12-01), Van Esponk et al.
patent: 4636681 (1987-01-01), Misumi
Haas et al., Interatomic Auger Analysis of the Oxidation of Thin Barium Films, Applications of Surface Science 16, North Holland Publishing Co. (1983) pp. 142-143, 148-149 and 156-162.
Yamamoto et al., Electron Emission Properties and Surface Atom Behavior of Impregnated Cathodes with Rare Earth Oxide Mixed Matrix Base Metals, Applications of Surface Science 20, Elsevier Science Publishers B.V. (1984) pp. 61-83.
R. O. Jenkins, A Review of Thermionic Cathodes, Vacuum, vol. 19, No. 8, Pergamon Press Limited, Great Britain, Sections 4.2 and 4.2.2.
"Activation and Early Life of a Pressed Barium Scandate Cathode", A. van Oostrom et al, Applications of Surface Science 2 (1979) 173-186.

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