PINCUSHION RASTER DISTORTION CORRECTOR WITH IMPROVED PERFORMANCE

摘要

A television display system includes a kinescope for producing an electron beam and a deflection yoke for deflecting the electron beam to form a raster on a display screen of the kinescope. A field forming apparatus is located external to the yoke for correcting side pincushion distortion of the raster on the kinescope display screen. The field forming apparatus comprises a pair of magnetically permeable flux gathering members located on opposite sides of the yoke within the stray field produced by the vertical deflection coils of the yoke. Flux channeling members carry the flux from the flux gathering members to flux directing members at the front of the yoke where the appropriate distortion correction field is formed. The flux channeling members include a part that extends perpendicular to the kinescope so as to place the flux directing members close to the funnel of the kinescope in order to generate a field of sufficient intensity to provide the desired amount of pincushion distortion correction.