Patent ID: 6396206
Filing Date: 2002-05-28
Classification: H01J,H04N

Abstract:
A color cathode ray tube apparatus comprising:a vacuum envelope including a substantially rectangular panel having first and second axes which perpendicularly pass through a tube axis and are perpendicular to each other, a funnel connected to the panel, and a neck connected to an end of a small diameter portion of the funnel; a phosphor screen formed on an inner surface of the panel, a mask for selecting colors, the mask having a surface which faces the phosphor screen with a predetermined distance, and a number of electron beam passage apertures formed in the surface; an electron gun arranged in the neck, for emitting three electron beams toward the phosphor screen, the three electron beams including a center beam and a pair of side beams and being arranged in line with the first axis set as an in-line direction; a deflection yoke installed on the small diameter portion of the funnel and the neck and having deflection coils for deflecting the three electron beams in directions of the first and second axes and a magnetic core provided outside the deflection coils; neck side orbital correction means arranged between a cathode of the electron gull and the phosphor screen for relatively over-converging the pair of side beams when the side beams are running toward a peripheral portion of the phosphor screen compared with a time when the pair of side beams are running toward a center of the phosphor screen; and panel-side orbital correction means arranged between the neck-side orbital correction means and the phosphor screen, for relatively under-converging the pair of side beams when the side beams are running toward the peripheral portion of the phosphor screen compared with a time when the pair of side beams are running toward the center of the phosphor screen, wherein the panel-side orbital correction means includes looped orbital correction coils provided at four positions inside the magnetic core, each of the orbital correction coils being wound a plurality of times and a current supply circuit for supplying the orbital correction coils with a current which is supplied to the deflection coils for deflecting the three electron beams in the direction of the second axis, and in a cross section perpendicular to the tube axis at a position near the phosphor screen, each of the orbital correction coils at the panel-side orbital correction means which is provided between the first and second axes, includes first coil wires which have an angle of 10 to 30Â° with respect to the second axis and through which a current flows in a direction form a side of the neck toward the panel and second coil wires which have an angle of 60 to 90Â° with respect to the second axis and through which a current flows in direction from a side of the panel toward the neck.