Electromagnetic focusing cathode-ray tube

Details Electromagnetic focusing cathode-ray tube Electromagnetic focusing cathode-ray tube

1981-07-01

1984-03-27

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313443, H01J 2964

Patent

active

044397100

ABSTRACT:
An electromagnetic focusing cathode-ray tube in which plural pairs of magnetic material members are arranged within the tube along the tube axis, the magnetic material members in each pair are disposed to oppose each other in the direction of the tube axis with a gap defined therebetween, and the plural magnetic material member pairs and one or more permanent magnet disposed internally or externally of the tube are combined such that magnetic focusing fields having their senses or directions opposite to each other in the direction of the tube axis are formed at the respective gaps associated with the adjacent magnetic material pairs.

REFERENCES:
patent: 2149101 (1939-02-01), Ploke
patent: 2785330 (1957-03-01), Fogelberg et al.
patent: 4362964 (1982-12-01), Sakurai et al.

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