Cathode in a cathode ray tube

Details Cathode in a cathode ray tube Cathode in a cathode ray tube

1991-06-28

1992-06-16

Yusko, Donald J.

Electric lamp and discharge devices

Electrode and shield structures

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

445 35, 445 46, 445 51, 427 78, 4271263, H01J 114

Patent

active

051227070

ABSTRACT:
A cathode for use in electron tubes which comprises a base metal made of nickel as a principal component and having a surface on which a porous electron emissive layer is formed. The porous electron emissive layer is of a composition comprising 0.1 to 20 wt % (relative to the total weight of the porous electron emissive layer) of scandium oxide having a layered crystalline structure dispersed in an oxide of alkaline earth metal including at least barium. This cathode can be made by preparing a solution in which nitrocellulose is dissolved with the use of an organic solvent, mixing both of barium carbonate and scandium oxide having a layered crystalline structure into the solution to provide an suspension, pulverizing solid components of the suspension for the adjustment of particle size, and depositing the suspension on a surface of the base metal to form the electron emissive layer.

REFERENCES:
patent: 4007393 (1977-02-01), van Stratum et al.
patent: 4518890 (1985-05-01), Taguchi et al.
patent: 4797593 (1989-01-01), Saito et al.
patent: 4864187 (1989-09-01), Sano et al.

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