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

1982-05-21

1985-01-22

Demeo, Palmer

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

H01J 2951

Patent

active

044954387

ABSTRACT:
A magnetic ring for adjusting color purity and convergence is secured to the electron gun of a color-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 is chosen so that the y-distance of the ring from the central axis of the central electron beam is greater than the distance of the ring from the respective central axis of an outer electron beam. This selection of distances influences the focus of the beams.

REFERENCES:
patent: 3614502 (1971-10-01), Doggett et al.
patent: 4377767 (1983-03-01), Kornaker

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