Patent ID: 6326742
Filing Date: 2001-12-04
Classification: H01J

Abstract:
A color cathode ray tube comprising:a glass bulb which has a front panel and a fluorescent screen that is set on an inner surface of the front panel;an in-line electron gun which is provided in the glass bulb and projects a plurality of electron beams onto the fluorescent screen;a deflection means including a horizontal deflection coil that deflects the electron beams in a horizontal direction and a vertical deflection coil that deflects the electron beams in a vertical direction, the horizontal and vertical deflection coils being arranged outside the glass bulb; anda correction means for generating a corrective magnetic field that is used for correcting cross-misconvergence, a strength of the corrective magnetic field being changed in accordance with an amount of deflection of the electron beams in the vertical direction, said strength of the corrective magnetic field being largest when the electron beams are deflected to a horizontal strip in the middle portion of an upper and lower half of the fluorescent screen, and the correction means further comprising at least one correction coil having a magnetic pole being parallel to a tube axis which begins at the neck and extends through the screen.