Gas discharge electron gun for generating an electron beam by means of a glow discharge
AssigneeU.S. Philips Corporation
InventorTheodorus Maria Berendina Schoenmakers
Life of this patent
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Abstract
A gas discharge electron gun for generating an electron beam by secondary emission from an active surface of a cathode which is surrounded by a cathode sleeve coaxially projecting towards an open end of a tubular anode.
Claims7
A gas discharge electron gun for generating an electron beam by means of a glow discharge, comprising, within an envelope, means to produce a gaseous ionizable medium, a tubular anode defining two open ends, a cathode arranged coaxially with said anode and having an active surface from which electrons are released by secondary emission in such a quantity as to form a beam composed mainly of the secondary electrons, and a conductive sleeve connected to said cathode around said active surface and projecting toward an open end of said anode.
Dependencies are inferred from the claim text.