Color cathode ray tube having a convergence device capable of correction of convergence without landing transition or raster rotation

摘要

A ring-formed correction coil for generating a magnetic field is mounted on the cathode side of CPM 4 provided on the neck portion of a color cathode ray tube, thereby being disposed distant from the deflection yoke. By using the magnetic field generated by supplying a correction current from a control circuit to the correction coil of this arrangement, correction of convergence error of R and G beam horizontal lines are carried out without causing landing transition or raster rotation. Further, since the correction coil is disposed distant from the phosphor screen, a large amount of correction can be assured on the phosphor screen, thereby saving current supplied from the control circuit to the correction coil.