Deflection yoke with permanent magnet raster correction

A deflection yoke assembly for use with a cathode ray tube having three in-line beams, comprising:

• a pair of horizontal and a pair of vertical deflection coils respectively producing when energized generally pincushion and barrel-shaped deflection fields for producing substantial convergence of said three beams at all points of a raster scanned by said beams;
• first magnetic field producing means disposed for producing respective fields near the top and bottom of the yoke near the beam exit end of the yoke which are of the same polarity as the field produced by said vertical deflection coils;
• and
• second flux altering means disposed adjacent the inside flare of said yoke at the top and bottom at a central portion of the length of said yoke for increasing the barrel shape of said vertical deflection magnetic field near the vertical deflection axis;
• said first and second means altering said vertical deflection field for producing raster distortion correction while maintaining said substantial convergence of said beams.