Cathode for electron tube

Details Cathode for electron tube Cathode for electron tube

H - Electricity

01

J

H01J 29/04 (2006.01) H01J 1/142 (2006.01)

Patent

CA 2188802

A cathode for an electron tube formed by coating the base of the cathode for the electron tube With an alkaline-earth metal carbonate containing at least barium as the alkaline-earth metal, and thermally decomposing in a vacuum to generate an emitter mainly comprising an alkaline-earth metal oxide, wherein a mixture of two or more kinds of alkaline-earth metal carbonate crystalline particles having different shapes is used as the above mentioned alkaline-earth metal carbonate. Since the present invention can provide a cathode for electron tube having improved both cut-off drift and emission characteristic at the same time, it is useful as a cathode for the electron gun of a CRT, or a cathode for the electron gun of an electron microscope.

On fabrique cette cathode de tube électronique en formant, sur un matériau de base, un émetteur se composant principalement d'oxydes métalliques alcalino-terreux que l'on obtient par dépôt, sur ledit matériau, de carbonates de métaux alcalino-terreux comprenant au moins du baryum, puis par pyrolyse sous vide des carbonates, lesquels comprennent un mélange d'au moins deux sortes de grains de cristaux, à configurations différentes, de carbonates métalliques alcalino-terreux. On améliore ainsi à la fois la variation de la tension de blocage et la caractéristique d'émission de cette cathode, laquelle est utile en tant que cathode de tubes à rayons cathodiques (CRT) et de tubes électroniques utilisés comme canons à électrons dans des microscopes électroniques.

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