Abstract: In a television receiver, a magnetic field compensator of a horizontal component of the earth's magnetic field includes a fluxgate magnetometer having a pair of sensing windings for generating first and second sensing signals representative of corresponding components of the horizontal component of the earth's magnetic field. The sensing signals generate current in a pair of substantially planar coils disposed in a non-parallel vertical configuration on the rear periphery of a cathode ray tube. The currents in the coils produce a magnetic field that compensates or neutralizes the effect of the horizontal component of the earth's magnetic field on the electron beam in the cathode ray tube. Whenever the position of the receiver is changed, rotationally or geographically, the current in the coils is automatically adjusted to provide automatic neutralization.

Abstract: A raster distortion corrector for a cathode ray tube includes magnetically permeable corrector pieces that are located on opposite sides of the deflection yoke. A part of each corrector piece is located within the external field of the vertical deflection coils and presents a low reluctance path to the external field flux. The flux is directed via a flux channelling arm of each corrector piece to a field shaper that causes a distortion correcting field to be formed between the corrector pieces. The flux channelling arms are formed and located so that there is no significant interaction of the corrector pieces with the horizontal deflection field.

Abstract: A television receiver deflection yoke mounted on a kinescope incorporates toroidally wound vertical deflection coils which generate stray fields that undesirably interact with components of adjacent receivers or video monitors. The deflection yoke incorporates magnetically permeable field forming members which utilize the stray field flux to form an electromagnetic field at the front of the yoke to aid in side pincushion distortion correction. The field forming members comprise a flux gathering portion which is located within the region of the stray field and follows the contour of the yoke core. The flux gathering portions extend along substantially the entire length of the vertical coils and are curved to encompass a significant portion of the external surface of the core in order to reduce the undesirable effects of the stray field and to form a strong pincushion distortion correcting field.

Abstract: A television display system includes a kinescope 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.

Abstract: A self-converging deflection yoke for use with a color television kinescope provides both coma and side pincushion distortion correction through the use of double bias vertical deflection coils. The vertical coils are toroidally wound about a magnetically permeable core. A winding frame insert located within the interior of the core allows the coils to follow the desired double bias or diamond configuration. The core insert comprises a ring-shaped base adjacent to the core. Removable wire guide members are spaced away from the base to form channels between the guide members and the base. These channels receive the wires during windings and act to define the shape of the coils. After the coils are wound, the guide members are removed, allowing the yoke to be assembled.

Abstract: In a color television receiver having an in-line electron beam kinescope and deflection yoke, a correction apparatus comprises a pair of magnetically permeable field formers located on opposite sides of the yoke. A first portion of each field former lies within the external field of the vertical deflection coils and channels flux from the external field into the field formers. A second portion of each field former is configured to form a pair of feet located above and below the longitudinal axis of the kinescope. Flux channelled into the field formers is directed by the feed to form a pincushion-shaped field within the kinescope neck to correct vertical coma errors. A third portion of each field former lies forward of the feet and directs the channelled flux to form a barrel-shaped field within the kinescope neck to correct any misconvergence of the outer electron beams caused by the coma correcting field.