Cathode-ray tube

Details Cathode-ray tube Cathode-ray tube

1979-11-15

1982-01-12

Krawczewicz, Stanley T.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313409, 313412, 313443, H01J 2950

Patent

active

043107761

ABSTRACT:
An astigmatic cross-over of the electron beam produced by an electron gun in a cathode ray tube is effected by a non-circular symmetrical magnetic field produced by a permanent magnet arrangement provided in the vicinity of the grid of the gun. The spot produced by the beam on the display screen of the tube has a minimum of haze surrounding it and has dimensions which do not vary substantially with potential variations at the grid.

REFERENCES:
patent: 2579273 (1951-12-01), Reisner, Jr.
patent: 2919381 (1959-12-01), Glaser
patent: 3201631 (1965-08-01), Gale et al.
patent: 3389252 (1968-06-01), Le Poole
patent: 3857057 (1974-12-01), Barten

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