Patent ID: 6215257
Filing Date: 2001-04-10
Classification: H01J,H04N

Abstract:
An apparatus for correcting a misconvergence and geometric distortion of a deflection yoke, comprising:a generally conical coil separator having a neck part and screen part;an upper horizontal deflection coil and lower horizontal deflection coil disposed respectively on the upper and lower portions of the inner surface of said screen part of said coil separator in such a manner that they can electrically be connected to each other;a left vertical deflection coil and right vertical deflection coil disposed respectively on the left and right portions of the outer surface of said screen part of said coil separator in such a manner that they can electrically be connected to each other;a generally cylindrical ferrite core disposed on said outer surface of said screen part of said coil separator to reinforce magnetic fields of said left and right vertical deflection coils;coma precoils disposed on said neck part of said coil separator in such a manner that they can electrically be connected to said left and right vertical deflection coils, said coma precoils generating pin-cushion magnetic fields to offset barrel magnetic fields generated by said left and right vertical deflection coils;distortion adjustment means for controlling the relative amounts of current flowing respectively through said left and right vertical deflection coils to adjust left and right relative magnetic fields so as to adjust a geometric distortion on a screen;first misconvergence adjustment means for controlling the relative amounts of current flowing respectively through left ones of said coma precoils and right ones of said coma precoils to adjust left and right relative magnetic fields so as to adjust a vertical misconvergence on said screen; andsecond misconvergence adjustment means for controlling the relative amounts of current flowing respectively through upper ones of said coma precoils and lower ones of said coma precoils to adjust upper and lower relative magnetic fields so as to adjust a horizontal misconvergence on said screen.