Electron beam tube
AssigneeLicentia Patent-Verwaltungs-G.m.b.H.
InventorsKlaus Schaffernicht, Rainer Kolbeck
Life of this patent
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Abstract
An electron beam tube having a getter surface and an electrically heatable cathode whose heating power is less than 250 mW, is provided with a metal member and that member is supplied with heating power of 500 mW to 10 Watt to be heated temporarily to above temperature 800.degree. C., upon completion of evacuation of the tube and after production of the getter surface, to eliminate residual gas.
Claims4
In a method for evacuating an electron beam tube having an electrically heatable cathode whose heating power is less than 250 mW, which method includes producing a getter surface on interior walls of the tube, the improvement comprising and providing within the tube a metal member separate from the cathode and capable of being heated to above 800.degree. C.;
- and supplying heating power to said member sufficient to heat it to above 800.degree. C. after formation of the getter surface.
Dependencies are inferred from the claim text.