Convergence correction apparatus

Details Convergence correction apparatus Convergence correction apparatus

1986-07-23

1987-11-03

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315400, H01J 2970, H01J 2976

Patent

active

047045647

ABSTRACT:
A convergence correction apparatus comprises a pair of horizontal deflecting coils and a pair of vertical deflecting coils constituting a deflection yoke of a self-convergence system color picture tube, saturable reactors for correcting convergence error in horizontal lines by varying a distribution of a horizontal deflection magnetic field with time, auxiliary control coils coupled to the vertical deflecting coils and wound of the saturable reactors for varying inductances of coils of the saturable reactors by auxiliary control magnetic fields generated by the auxiliary control coils, and a correcting circuit for supplying to the auxiliary control coils a current which has a waveform other than a sawtooth waveform and has a period equal to the vertical deflection period, and for non-linearly varying magnitudes of the auxiliary magnetic fields generated thereby.

REFERENCES:
patent: 3902100 (1975-08-01), Nakagawa et al.

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