Static convergence unit

Details Static convergence unit Static convergence unit

H - Electricity

01

J

313/35.1201

H01J 29/70 (2006.01)

Patent

CA 1078447

ABSTRACT: Two six-pole annular magnetic structures are arranged about the neck of a three-in-line colour display tube so as to be eccentric with respect to each other and with respect to the centre of the neck. The centre of one six-pole is situated halfway between the central electron beam and one outer electron beam. The two beams on both sides of the centre of the six-pole, consequently,are subjected to equal forces of the same direction. The third beam is subjected to a force in the same direction, but this force is nine times larger due to the three times as larger distance from the centre of the six-pole and due to the square-law field variation thereof. Because of their identical direction and value, the forces acting on the former beams will not disturb the convergence therebetween. -14-

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