Shielding means for cathode ray tube

Details Shielding means for cathode ray tube Shielding means for cathode ray tube

1974-11-25

1976-06-08

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313414, H01J 2902, H01J 2956

Patent

active

039625990

ABSTRACT:
An internal improvement is provided in a cathode ray tube wherein the electron gun assembly is positioned in close proximity to the sidewall of the encompassing neck portion of the tube envelope. The improvement is in the form of discrete shielding means incorporated in conjunction with one or more electrodes in the forward portion of a multi-beam electron gun assembly to minimize the effect of positive neck charge on the trajectories of the electron beams traversing the portions of the assembly closely related to the neck wall. Each shielding means is comprised of an element formed of substantially round wire material configurated as a U-shaped member, whereof the bottom bridge-portion of the member is substantially contiguous with the rolled rim of the associated electrode, extending outward therefrom toward but not touching the adjacent glass wall of the neck. The shielding, so positioned, dimensionally reduces the areal region through which the effects of the neck charge may influence the beam traversing the related electrodes.

REFERENCES:
patent: 3376448 (1968-04-01), Schwartz
patent: 3389284 (1968-06-01), Andrews
patent: 3558954 (1971-01-01), Lilley
patent: 3564327 (1971-02-01), Johnson
patent: 3619688 (1971-11-01), McQueen et al.

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