Oxide cathode employing Ba evaporation restraining layer

Electric lamp and discharge devices – Electrode and shield structures – Cathodes containing and/or coated with electron emissive...

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313346DC, 252521, H01J 114, H01J 1906

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active

055481841

ABSTRACT:
An oxide cathode is provided including a metal base, an electron emissive material layer formed on the metal base and having barium as a main component, a heater for heating the electron emissive material layer, and a Ba evaporation restraining layer having a thickness ranging from 10.ANG. to 10,000.ANG. and consisting of at least one titanium compound formed on the electron emissive material layer.

REFERENCES:
patent: 3454816 (1969-07-01), Hoffmann et al.
patent: 4483785 (1984-11-01), Johnson et al.
patent: 4797593 (1989-01-01), Saito
patent: 4924137 (1990-05-01), Watanabe et al.
patent: 5126623 (1992-06-01), Choi

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