Color cathode ray tube apparatus to modify deflection magnetic f

Details Color cathode ray tube apparatus to modify deflection magnetic f Color cathode ray tube apparatus to modify deflection magnetic f

1984-05-10

1986-07-15

Willis, Davis L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313428, 313431, 315 8, 315370, 335211, H01J 2950

Patent

active

046008586

ABSTRACT:
In a cathode ray tube apparatus having an in-line type electron gun, magnetic pole pieces comprising four pole pieces of substantially arc-shaped cross section are disposed in a cylindrical shape with circumferential gaps between neighboring pole pieces 0.degree., 90.degree., 180.degree., and 270.degree. locations on the cylinder. An additional pair of narrow width stripe-shaped pole pieces are disposed inside said cylinder at a predetermined distance from the cylinder in a manner to cover the 90.degree. and 180.degree. gaps. The apparatus acting to modify the horizontal and vertical deflection magnetic fields so that the electron beam spots on the phosphor CRT screen are substantially circular in shape without losing the self convergence effect of the magnetic fields.

REFERENCES:
patent: 2880367 (1959-03-01), Caprio
patent: 4415831 (1983-11-01), Konosu
patent: 4433268 (1984-02-01), Arisato

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