Hot cathode in wire form coated with rare and alkaline earth...

H - Electricity – 01 – J

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313/187

H01J 1/15 (2006.01) H01J 1/14 (2006.01) H01J 61/067 (2006.01)

Patent

CA 1276965

ABSTRACT: A hot cathode in a wire form that is useful in a vacuum tube, a CRT or a fluorescent display tube is dis- closed. 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 rare earth metal oxide in admixture with an alkaline earth metal oxide the balance of which contains at least barium oxide. The reduc- tion of oxide barium to barium as a result of reaction with the cathode wire is so much retarded that an increased emis- sion current will be produced from the cathode not only in its initial operation but also through out its operation.

548815

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