Patent ID: 6838811
Filing Date: 2005-01-04
Classification: H01J

Abstract:
1. A deflection yoke provided on an external surface of a cathode ray tube, comprising: a tube-shaped core (i) in which an opening at a first end is smaller than an opening at a second end, (ii) that is made of a magnetic material, (iii) that has, on an inner wall thereof, a plurality of ridges each of which starts from the first end and extends toward the second end for a part of a length of the core, the plurality of ridges being arranged circumferentially at predetermined intervals and thereby forming a plurality of core slots, and (iv) in which a remaining area of the inner wall thereof in a vicinity of the second end is finished to be smooth; a first deflection coil that is wound on the core so as to be partially guided by one or more of the core slots; a second deflection coil that is positioned more inward than the first deflection coil; and an insulating frame that (i) is sandwiched between the first deflection coil and the second deflection coil, and (ii) has, in an area thereof that corresponds to the smoothly-finished remaining area of the core and/or in an area thereof that extends off the second end of the core in a tube axis direction, a plurality of guiding slots extending along the tube axis direction of the cathode ray tube and being arranged circumferentially, wherein the second deflection coil is wound so as to be partially guided by one or more of the guiding slots.