Coma-corrected picture display system

Details Coma-corrected picture display system Coma-corrected picture display system

1989-02-10

1990-10-09

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313413, H01J 2970

Patent

active

049623338

ABSTRACT:
A color television display tube comprising a system of three co-planar electron guns and an electro-magnetic deflection unit comprising a field deflection coil and a line deflection coil. For correcting certain convergence errors a pair of axially extending pole shoes of a magnetizable material is arranged in a plane symmetrically with respect to the tube axis between the deflection unit and the gun system, which pole shoes are magnetically coupled to each other, for example by means of a ring of a magnetizable material.

REFERENCES:
patent: 4415831 (1983-11-01), Konosu
patent: 4600858 (1986-07-01), Iwasaki et al.
patent: 4625145 (1986-11-01), Gerritsen et al.

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