Electron beam device having an electron gun and a method of making the electron gun
AssigneeU.S. Philips Corporation
InventorGerardus A. H. M. Vrijssen
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Abstract
An electron gun for an electron beam device comprises a vitreous elongate tubular body (22) having a plurality of electrodes (24, 27 to 31 and 33 to 37) provided therein. Electrical connections (50, 52, 54) to at least some of these electrodes comprise respective conductors extending within the thickness of the wall of the tubular body (22). The tubular body is made by uniting inner and outer cylindrical members under the influence of heat while drawing them under sub-atmospheric pressure onto a profiled mandril, the electrical connections (50, 52 and 54) having been prepositioned on the inner cylindrical member.
Claims33
A method of making an electron gun for an electron beam device, the electron gun comprising an electrically insulating tubular body having electrodes provided therein and electrical connections to said electrodes, the method comprising pre-positioning one or more conductors on the external surface of a first cylindrical member, a terminal portion of the or each conductor extending through an aperture or a respective aperture in the wall of the first member, providing a suction mandril interiorly of the first member, arranging a second cylindrical member about the first member, uniting the first and second members with the conductors therebetween by heating them and drawing them under sub-atmosphere pressure onto the suction mandril so that the first and second members unite inseparably to form a tubular body, removing the suction mandril from the formed tubular body and providing electrodes in said tubular body.
An electron beam device comprising an envelope including a faceplate, a conical portion, and a neck portion said envelope containing an electron gun comprising:
- a. a tubular housing consisting essentially of an electrical insulating material, said tubular housing having a longitudinal axis and including an inner surface and an outer surface;
- b. a plurality of electrodes disposed along the inner surface of the tubular housing at respective axial positions;
- and
- c. at least one conductor embedded in the tubular housing between said inner and outer surfaces and extending generally parallel to at least one of said surfaces over a substantial portion of the conductor's length, a terminal portion of said conductor extending inwardly through said inner surface and making electrical contact with one of the electrodes.
Dependencies are inferred from the claim text.