System for beam landing correction in color cathode ray tube

Details System for beam landing correction in color cathode ray tube System for beam landing correction in color cathode ray tube

H - Electricity

04

N

350/76

H04N 9/16 (2006.01)

Patent

CA 1038075

ABSTRACT OF THE DISCLOSURE A system for compensating for mislanding of electron beams in a color cathode ray tube, which comprises a coil device provided on the color cathode ray tube in addition to a main deflection coil, a circuit for producing a plurality of currents having different wave forms, respectively, and a connecting device for connecting the coil device to selected one of connection points of the circuit so as to supply one or more of the currents produced in the circuit, which has a desired wave form, to said coil device selectively in response to the direction to which the color cathode ray tube faces, thereby to achieve sufficient compensation for mislanding of electron beams caused by the earth's magnetic field regardless of the directional situation of the cathode ray tube.

221813

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