Hot cathode in wire form

Details Hot cathode in wire form Hot cathode in wire form

1987-10-05

1990-01-30

Wieder, Kenneth

Electric lamp and discharge devices

Electrode and shield structures

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

313345, H01J 114

Patent

active

048975745

ABSTRACT:
A hot cathode in a wire form is useful in a vacuum tube, a CRT or a fluorescent display tube is disclosed. The cathode is composed of a heat-resistant metal in a wire form that holds on it an electron-emitting metal material that is made of 0.2-20 wt % of a rear earth metal oxide in admixture with an alkaline earth metal oxide the balance of which contains at least barium oxide. The reduction of oxide barium to barium as a result of reaction with the cathode wire is so much retarded that an increased emission current will be produced from the cathode not only in its initial operation but also through out its operation.

REFERENCES:
patent: 4350920 (1982-09-01), Bertens
Patent Abstracts of Japan, vol. 5, No. 133, Aug. 25, 1981, p. 148.
Patent Abstracts of Japan, vol. 8, No. 70, Apr. 3, 1984, p. 135.
Patent Abstracts of Japan, vol. 10, No. 293, Oct. 4, 1986, p. 66.

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