High resolution torodidal deflection yoke

A deflection yoke for a cathode ray tube comprising:

• a frustro-conical shaped core member of magnetic material having a longitudinal axis and substantially circular front and back end portions, said core member being formed to telescope over the neck portion of a cathode ray tube;
• a substantially circular-shaped back crown member affixed to said substantially circular-shaped back end portion of said core member and having a plurality of wire-receiving slots on a surface substantially parallel to said back end portion of said core member;
• a substantially circular-shaped front crown member affixed to said substantially circular-shaped front end portion of said core member and having a substantially flat surface parallel to said front end portion and a plurality of wire receiving slots on an outer circumferential surface thereof;
• and
• a plurality of wire turns toroidally wrapped about said core and front and back crown members, said wire turns being positionally located to effect a single layer at said front crown member and multiple layers at said back crown member with a first layer of said multiple layers at said back crown member extending radially of said core member and added layers of said multiple layers of wire turns at said back crown member extending non-radially of said core member, said front and back crown members having slots in a ratio of at least 3:1, and layers of wire turns in a ratio of at least 1:3.

A deflection yoke fabricating process comprising the steps of:

• selecting a frustro-conical shaped core member of magnetic material having substantially circular front and back end portions and formed to telescope over the neck portion of a cathode ray tube;
• selecting and affixing front and back crown members to said front and back end portions of said core member, said front crown member having a substantially flat surface parallel to said front end portion and a plurality of wire-receiving slots on an outer circumferential surface and said back crown member having a plurality of wire receiving slots in a surface parallel to said back end portion, said front crown member having three times the wire-receiving slots of the back crown members;
• wrapping a first layer of wire turns in adjacent slots of said back crown members and extending radially to a first pair of slots separated by a second pair of slots on said front crown member;
• and
• wrapping added layers of wire turns on said back crown member and non-radially in said second pair of slots on said front crown member to provide a single layer of turns on said front crown member.