CRT With means for suppressing arcing therein
AssigneeRCA Corporation
InventorKarl G. Hernqvist
Life of this patent
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Abstract
A CRT comprising an evacuated envelope having an electrically-insulating neck and a beaded electron-gun mount assembly in the neck. The beads of the assembly are closely spaced from the inner surface of the neck. At least a portion of the surfaces of the beads opposite the neck is electrically conducting.
Claims9
A cathode-ray tube comprising an evacuated envelope including an electrically-insulating neck, and an electron-gun mount assembly in said neck, said mount assembly comprising a plurality of electrodes mounted on at least two electrically-insulating support rods, said assembly being closely spaced from the inner surface of said neck, at least a portion of the surface of each of said support rods facing a portion of said neck being electrically conducting each of said electrically conducting portions being opposite an electrode that participates in focusing said electron beam, and having a resistivity of less than about 50,000 ohms per square and is electrically floating.
A cathode-ray tube comprising
- (a) an evacuated envelope including a glass neck and
- (b) an electron-gun mount assembly in said neck, said mount assembly comprising (1) a plurality of electrodes related to provide for generating, forming and focusing at least one electron beam, (2) at least two elongated glass support beads peripheral to said electrodes and providing support and affixed positioning to said electrodes, each of said support beads having an extended surface closely spaced from and facing the inner surface of said neck (3) a conducting coating on a portion of each of said bead surfaces facing a portion of said neck surface that is opposite an electrode that participates in focusing an electron beam, each of said coatings having a resistivity of less than about 50,000 ohms per square and each of said coatings is electrically floating, and (c) means for applying operating voltages to said electrodes.
Dependencies are inferred from the claim text.