Magnetic focusing type cathode ray tube

Details Magnetic focusing type cathode ray tube Magnetic focusing type cathode ray tube

1982-08-25

1985-01-22

Demeo, Palmer

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313413, 313414, H01J 2964, H01J 2951

Patent

active

044954395

ABSTRACT:
A magnetic focusing type cathode ray tube includes a magnetic yoke assembly, for magnetically focusing and converging three in-line electron beams, having a pair of magnetic yokes opposing each other with a predetermined gap therebetween. The magnetic cylinders on the cathode side are so formed as to have a strong magnetic shield effect while the magnetic cylinders on the screen side are weak in magnetic shield effect. The radial components in the magnetic field produced in the magnetic gap, which act on the side beams in a direction perpendicular to an in-line direction, are reverse in polarity on the cathode side and screen side so that radial components emerge so as to converge the beams in a tube axis direction.

REFERENCES:
patent: 3866080 (1975-02-01), Barkow
patent: 4310780 (1982-01-01), Sakurai et al.

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