Method of manufacturing a colour display tube and colour...

Details Method of manufacturing a colour display tube and colour... Method of manufacturing a colour display tube and colour...

H - Electricity

01

J

316/11, 313/35.1

H01J 9/00 (2006.01) H01F 13/00 (2006.01) H01J 29/00 (2006.01) H01J 29/70 (2006.01)

Patent

CA 1122264

ABSTRACT: It is possible to correct the convergence, colour purity and frame errors of a colour display tube by providing a ring which is magnetised as a multipole and which is secured in or around the tube neck and around the paths of the electron beams. The magnetisation of such a ring can best be carried out by energizing a megnetisation unit with a combination of currents and generating a multipole magnetic field and then producing the magnetisation by generating a decaying alternating magnetic field which preferably varies its direction continuously. - 20 -

306466

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