Cathode for electron gun and its manufacturing method

Details Cathode for electron gun and its manufacturing method Cathode for electron gun and its manufacturing method

1990-09-07

1991-12-10

Yukso, Donald J.

Electric lamp and discharge devices

Electrode and shield structures

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

313346DC, 313311, 252521, H01J 1906

Patent

active

050721496

ABSTRACT:
A cathode for an electron gun and its manufacturing method are disclosed. The cathode comprises thermoelectron emission substance layer composed of triple composite oxide of alkaline earth metal formed by thermally decomposing triple carbonate of alkaline earth metal such as barium, strontium and calcium, containing a fourth substance. The fourth substance consists of scandium nitrate or indium nitrate so that the fourth substance can be uniformly dispersed into the thermoelectron emission substance layer, and thus the thermoelectron emission characteristics and durability of the cathode can be remarkably enhanced.

REFERENCES:
patent: 4797593 (1989-01-01), Saito et al.
patent: 4864187 (1989-09-01), Sano et al.

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