Distortion correction in electromagnetic deflection yokes

An electromagnetic deflection yoke for correcting residual cross coupling distortion, comprising

• a rifle barrel ferromagnetic core having a generally annular cross section for accommodating the neck of cathode ray and like display tubes and having internal grooves and lands running in the general direction of the electron beam in said cathode ray and like display tubes,
• a saddle winding of two like diametrically opposed saddle shaped coils each having a continuous elongated conductor laid in said grooves and across the ends of the lands involved in the turns formed thereby,
• and another saddle winding of two coils arranged in said yoke for the complementary direction of deflection, there being stray capacitance established between the two windings,
• the turns of said coils being formed and distributed in a succession of courses, the first course comprising a single turn laid in the grooves defining the central land coincident with the axis of the magnetic field to be established, a succeeding course comprising a plurality of turns laid in the grooves about the next two lands adjacent to and including said central land, a further succeeding course comprising a multiple of turns laid in the next pair of grooves about the two lands adjacent to and encompassing the previously said lands, and so on to the final course comprising the remaining turns laid in the last two grooves and encompassing all of the lands for that coil, and
• a pair of capacitors connected in series across the first said winding with the junction between capacitors connected to a center tap on the first said winding,
• the capacitance of each of said capacitors being equal to one half said stray capacitance between the first said winding and said other winding of the deflection yoke.

An electromagnetic deflection yoke for correcting cross coupling distortion comprising

• one winding arranged in said yoke for deflection in a given direction,
• another winding arranged in said yoke for the complementary direction of deflection;
• the arrangement of said windings resulting in a capacitor existing therebetween,
• a capacitor connected in series with said one winding and a source of deflection voltage wave, and
• another capacitor shunted across said source of deflection voltage wave,
• the sum of the capacitances of said capacitors being equal to said existing capacitance between said one winding and said other winding of the deflection yoke.

An electromagnetic deflection yoke for correcting cross coupling distortion comprising

• one winding arranged in said yoke for deflection in a given direction,
• another winding arranged in said yoke for deflection in the complementary direction,
• the arrangement of said windings resulting in a capacitive reactance existing therebetween,
• a reactance network connected to said one winding for correcting distortion,
• said reactance network having at least one capacitance element of value related to the capacitance of said capacitive reactance existing between the one and the other windings.

An electromagnetic deflection yoke

• for correcting cross coupling distortion comprising
• one winding arranged in said yoke for deflection in a given direction,
• another winding arranged in said yoke for deflection in the complementary direction,
• a reactance network connected to said one winding for correcting distortion, and
• said reactance network having
• a pair of capacitors connected in series across said one winding with the junction between capacitors connected to a center tap on said one winding, and
• the capacitance of each of said capacitors being equal to one half the capacitance between said one winding and said other winding of the deflection yoke.

An electromagnetic deflection yoke for correcting residual cross coupling distortion, comprising:

• a rifle barrel ferromagnetic core having a generally annular cross section for accommodating the neck of cathode ray and like display tubes and having internal grooves and lands running in the general direction of the electron beam in said cathode ray and like display tubes, and
• a saddle winding of two like diametrically opposed saddle shaped coils each having a continuous elongated conductor laid in said grooves and across the ends of the lands involved in the turns formed thereby,
• the turns of each of said coils being formed and distributed in a succession of courses with the initial course comprising at least one turn of said conductor laid in the grooves defining the central land coincident with the axis of the magnetic field to be established, a succeeding course comprising a number at least greater by one than the number of turns of said conductor in the previous course laid in the grooves about the next two lands adjacent to and including said central land, a further succeeding course comprising a number at least greater by two than the preceding number of turns of said conductor in the preceding course laid in the next pair of grooves about the two lands adjacent to and encompassing the previously said lands, and so on to the final course, the remaining turns of said conductor laid in the next two grooves and encompassing all of the lands for that coil.