Device for adjusting electron beams in a cathode-ray tube

Details Device for adjusting electron beams in a cathode-ray tube Device for adjusting electron beams in a cathode-ray tube

H - Electricity

01

J

313/35.1201

H01J 29/51 (2006.01) H01J 29/70 (2006.01)

Patent

CA 1206510

Device for Adjusting Electron Beams in a Cathode-Ray Tube Abstract of the Disclosure A magnetic ring for adjusting colour purity and convergence is secured to the electron gun of a colour-picture tube. It encloses an oblong area which is perpendicular to the plane defined by the three electron beams produced by the electron gun. The shape of the magnetic ring 22 is chosen so that the y-distance 46 of the ring from the central axis 42.1 of the central electron beam is greater than the distance of the ring from the respective central axis 42.2 of an outer electron beam. This selection of distances influences the focus of the beams. Magnetic rings of this kind can be used in all multi- beam cathode-ray tubes and particularly in colour- picture tubes with an electron gun producing three coplanar electron beams.

404979

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