Impregnated cathode

Details Impregnated cathode Impregnated cathode

1986-02-05

1988-04-12

Moore, David K.

Electric lamp and discharge devices

Electrode and shield structures

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

313352, 313630, 313633, 313635, 428336, 428472, 428701, H01J 1906, H01J 114, H01K 104

Patent

active

047376791

ABSTRACT:
The present invention relates to an impregnated cathode produced by attaching at least two layered thin films, the thin films comprising an under layer consisting of a high melting point metal thin film composed of, for example, Os, Ru, Rh, Pd, Ir, Pt, Re, Mo, W, Ta, etc., and an over layer consisting of a high melting point metal layer which contains Sc.sub.2 O.sub.3 and which is placed over the layer, on the surface of the impregnated cathode pellet generated by impregnating a refractory porous base body with electron emissive materials. The invention relates also to an electron tube having this cathode. This cathode maintains a low work functional mono-layer stably for a long period of time on its surface.

REFERENCES:
patent: 3155864 (1964-11-01), Coppola
patent: 4291252 (1981-09-01), Aida et al.
patent: 4369392 (1983-01-01), Hotta et al.
patent: 4518890 (1985-05-01), Taguchi et al.
patent: 4570099 (1986-02-01), Green
patent: 4594220 (1986-06-01), Hasker et al.
patent: 4626470 (1986-12-01), Yamamoto et al.
Lemmens et al., "A New Thermonic Cathode for Heavy Loads," Philips Technical Review, No. 12, Jun. 1950, pp. 341-372.
Yamamoto et al., "Electron Emissive Properties and Surface Atom Behavior of an Impregnated Cathode Coated with Tungsten Thin Film Containing Sc.sub.2 O.sub.3," Japan Journal of App. Phy., vol. 25, No. 7, Jul. 1986, pp. 971-975.

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