Patent ID: 6943490

Claim:
A deflection yoke mounted on a rear portion of a cathode ray tube (CRT) to deflect an electron beam emitted from an electron gun of the CRT, comprising: a coil separator mounted on the CRT; a horizontal deflection coil mounted on an inside of the coil separator, having a first section generating a horizontal deflection magnetic field deflecting the electron in a horizontal direction and having a first section radius, having a second section generating an unnecessary magnetic field weakening the horizontal deflection magnetic field and having a second section radius different from the first section radius; a vertical deflection coil mounted on an outside of the coil separator and generating a vertical deflection magnetic field deflecting the electron beam in a vertical direction; and a ferrite core covering a portion of the vertical deflection coil to strengthen the horizontal deflection magnetic field and the vertical deflection magnetic field; wherein the first and second sections of the horizontal deflection coil comprise an inside radius, wherein the inside radius of the second section is different from that of the first section; wherein the second section comprises a first sub-inside radius in a first direction and a second sub-inside radius in a second direction perpendicular to the first direction, and the first sub-inside radius is different from the second sub-inside radius.