Colour picture tube including a deflection unit having picture b

Details Colour picture tube including a deflection unit having picture b Colour picture tube including a deflection unit having picture b

1987-03-02

1988-12-27

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

335211, 335212, H01J 2972, H01F 100

Patent

active

047943009

ABSTRACT:
A deflection unit for a color television picture tube having in the neck thereof an electron gun system for producing a central electron beam coplanar with two outer electron beams. The deflection unit comprises a system of line deflection coils and a system of field deflection coils. The gun end of the system of field deflection coils is provided with two plate-shaped elements of a soft-magnetic material located at a distance from each other in the circumferential direction of the neck of the tube. Such elements are movable in that direction from a neutral position in which the distances between the centers thereof and the outer beams are equal, to a position in which one of such distances is greater than the other in order to correct picture balance errors due to unequal deflection of the beams.

REFERENCES:
patent: 3020434 (1962-02-01), Bloomsburgh
patent: 4145677 (1979-03-01), Maruyama et al.
patent: 4524340 (1985-06-01), Sluyterman

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