Vertical deflection coil structure for CRT

摘要

Electromagnetic deflection unit for colour cathode-ray tubes, comprising a pair of horizontal deflection coils and a pair of vertical deflection coils, the saddle-shaped vertical deflection coils having a rear bundle on the electron-gun side and a front bundle located on the screen side, lateral conductor harnesses 120 connecting the two bundles so as to produce a main window in the intermediate region lying between these said bundles, the conductor harnesses being arranged so that, at the end of the main window 18, on the gun side, at least 98% of the lateral harness conductors lie within an angular aperture THETA m of between 60 and 80 DEG . This arrangement of the conductors in the rear part of the window makes it possible to minimize the aberrations due to coma parabola so as to avoid the use of additional field shapers. <IMAGE>