Cathode for electron tube

Details Cathode for electron tube Cathode for electron tube

1991-10-07

1993-06-01

DeMeo, Palmer C.

Electric lamp and discharge devices

Electrode and shield structures

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

H01J 114

Patent

active

052163202

ABSTRACT:
The present invention improves the stability among the qualities of the electron tube cathodes in which the barium scandate is dispersed and contained in the alkali earth metal oxide layer provided on the surface of the base metal, by making the shape and average particle size of the barium scandate similar to those of the carbonate used to form the alkali earth metal oxide, and it avoids the deterioration of the electron emission property for a long time, by setting the concentration of the barium scandate in the alkali earth metal oxide layer to zero at the position close to the surface of the base metal.

REFERENCES:
patent: 4855637 (1989-08-01), Watanabe et al.
patent: 4924137 (1990-05-01), Watanabe et al.
patent: 4980603 (1990-12-01), Kimura et al.
patent: 5075589 (1991-12-01), Derks et al.

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