Method of correcting electron beam misconvergence in a color dis

Details Method of correcting electron beam misconvergence in a color dis Method of correcting electron beam misconvergence in a color dis

1987-05-07

1990-01-16

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

335211, H01J 2970, H01J 2976

Patent

active

048945935

ABSTRACT:
A method of post deflection correction of electron beam misconvergence in a color display tube, the method comprising: providing at least one permanently magnetizable substantially annular element externally of the tube envelope on the screen side of the plane of deflection of the deflection yoke; measuring the convergence errors at the screen; and magnetizing the element as a multipole to correct for the measured errors. The annular element may be mounted directly on the tube envelope, or may be secured to the deflection yoke.

REFERENCES:
patent: 4390815 (1983-06-01), Key et al.
patent: 4451807 (1984-05-01), McGlashan et al.
patent: 4606729 (1986-08-01), Kuiper
patent: 4662853 (1987-05-01), Van Veldhoven

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