In-line type electromagnetic focusing cathode-ray tube

Details In-line type electromagnetic focusing cathode-ray tube In-line type electromagnetic focusing cathode-ray tube

1981-07-28

1984-09-25

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313413, 313414, 313431, 313440, H01J 2951, H01J 2956, H01J 2964

Patent

active

044737734

ABSTRACT:
An improved in-line type electromagnetic focusing cathode-ray tube which comprises magnetic yokes, a focusing magnetic field generating permanent magnet, a deflecting magnetic field control element and a cup-shaped spacer member for separating the magnetic yokes from the deflecting magnetic field control element. The deflecting magnetic field control element is disposed at a distance l.gtoreq.0.26 D from an end of the magnetic yoke closest to a fluorescent screen, where D is an outer diameter of the magnetic yoke, so that a beam spot on the fluorescent screen has substantially circular shape to attain an excellent focusing characteristic.

REFERENCES:
patent: 4362964 (1982-12-01), Sakurai et al.

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