Claims
- 1. A helical coil deflection structure for a cathode ray tube, to deflect an electron beam, comprising:
- a. A conductor having a four-sided cross section of a given width and height, said conductor wound about an axis into a helical deflection coil having a plurality of equally spaced apart turns of a given pitch that extends along said axis, each turn having an outer diameter and an inner diameter which is smaller than said outer diameter;
- b. A threaded electrically conductive member disposed about said axis and having a plurality of equalled spaced threads, each thread with a crown and sidewalls, and a root between adjacent threads, in which the sidewalls in adjacent threads and the root between said adjacent threads together surround three sides of each turn of said helical deflection coil disposed therein to shield each said turn from adjacent turns in said coil;
- wherein said helical deflection coil and said threaded conductive member are both coaxially aligned about said axis in said structure, wherein said threaded conductive member comprises threads having a pitch which is the same as the pitch of said helical deflection coil; and wherein said threaded conductive member further comprises a respective notch formed in each of said threads to define an electron beam passageway having an axis aligned parallel to said axis.
- 2. The helical coil deflection structure of claim 1 wherein a respective distance between adjacent threads in said threaded member is greater than the width of said conductor.
- 3. The helical coil deflection structure of claim 1 wherein a respective distance between the crown and root of each of said threads is greater than the height of said conductor.
- 4. The helical coil deflection structure of claim 1 wherein said helical deflection coil and said threads on said threaded conductive member are both rectangular in cross-section.
- 5. The helical deflection coil structure of claim 1 wherein said threaded electrically conductive member comprises male threads wherein a diameter defined by the crowns of said male threads is larger than the outer diameter of said deflection coil and wherein a diameter defined by the roots of said threaded member is smaller than the inside diameter of said deflection coil whereby said turns of said coil fit in between said threads and are shielded by said threads without contacting said threads.
- 6. The helical coil deflection structure of claim 1 wherein a fourth side of each turn in said coil, adjacent to a line between the crowns of adjacent threads is also shielded by an electrically conductive sleeve which contacts the threads on said threaded member.
- 7. The helical coil deflection structure of claim 1 wherein a fourth side of each turn in said coil, adjacent to a line between the crowns of adjacent threads, is also shielded by an electrically conductive sleeve coaxially aligned about said axis with said threaded member, which contact the threads on said threaded member.
- 8. The helical coil structure of claim 1 wherein said conductor is rectangular in cross section.
- 9. The helical deflection coil structure of claim 1 wherein said threaded electrically conductive member comprises female threads wherein a diameter defined by the crowns of said female threads is smaller than the inner diameter of said deflection coil and wherein a diameter defined by the roots of said female threads is larger than the outer diameter of said deflection coil whereby said turns of said coil fit in between said threads and are shielded by said threads without contacting said threads.
- 10. The helical deflection coil structure of claim 9 wherein said threaded electrically conductive member comprises two generally identical halves to facilitate mounting said deflection coil of said female threads in said threaded electrically conductive member halves along an axial plane of said female threads.
- 11. A helical coil deflection structure for a cathode ray tube, to deflect an electron beam, comprising:
- a. A conductor having a four-sided cross section of a given width and height, said conductor wound about a first axis into a first helical deflection coil having a plurality of equally spaced turns of a given pitch that extends along said first axis, each turn having an outer diameter and an inner diameter, which is smaller than said outer diameter;
- b. A first threaded electrically conductive member disposed about said first axis and having a plurality of equalled spaced threads, each thread with a crown and sidewalls, and a root between adjacent threads, in which the sidewalls in adjacent threads and the root between said adjacent threads together surround three sides of each turn of said first helical deflection coil disposed therein to shield each said turn from adjacent turns in said first coil;
- c. A conductor having a four sided cross section of a given width and height, said conductor wound about a second axis into a second helical deflection coil having a plurality of equally spaced turns of a given pitch that extends along said second axis, each turn having an outer diameter and an inner diameter, which is smaller than said outer diameter;
- d. A second threaded electrically conductive member disposed about said second axis and having a plurality of equalled spaced threads, each thread with a crown and sidewalls, and a root between adjacent threads, in which the sidewalls in adjacent threads and the root between said adjacent threads together surround three sides of each turn of said second helical deflection coil disposed therein to shield each said turn from adjacent turns in said second coil;
- wherein said first helical deflection coil and said first threaded conductive member are both coaxially aligned about said first axis in said structure, wherein said second helical deflection coil and said second threaded conductive member are both coaxially aligned about said second axis in said structure, wherein said first threaded conductive member comprises threads having a pitch which is the same as the pitch of said first helical deflection coil, wherein said first threaded conductive member comprises a respective notch formed in each of said threads to define a first electron beam passageway having an axis aligned parallel to said first axis, wherein said second threaded conductive member further comprises a respective notch formed in each of said threads to define a second electron beam passageway having an axis aligned parallel to said second axis, and wherein said first electron beam passageway is arranged contiguous to said second electron beam passageway to form a common electron beam passageway so as to deflect said electron beam along one plane perpendicular to said common electron beam passageway.
- 12. A helical coil deflection structure for a cathode ray tube comprising:
- a. A conductor having a four-sided cross section of a given width and height, said conductor wound about an axis into a helical deflection coil having a fixed number of turns of a given pitch that extends along said axis between two ends of said coil;
- b. A threaded conductive member coaxially aligned with said coil about said axis and electrically insulated from said coil and having:
- i) At least one more thread than the number of turns of said coil;
- ii) A thread pitch substantially the same as said coil pitch;
- iii) A crown defined on each thread and a root defined between adjacent threads, said root having a length greater than the width of said conductor; whereby each turn of said coil is located within a respective space defined by said root length and a respective defined distance between said root and said thread crown to thereby electrically shield at least three sides of each of said turns of said coil from adjacent turns of said coil;
- vi) A respective notch formed in each of said threads to define an electron beam passageway having an axis aligned parallel to said axis; and
- c. Means for making electrical connection to each end of said coil.
- 13. The helical coil deflection structure of claim 12 which further comprises an electrically conductive member which contacts said crowns of said threads on said threaded member, whereby a fourth side of each turn in said coil, adjacent to a line between the crowns of adjacent threads of said threaded member, is also shielded by said electrically conductive member.
- 14. The helical deflection structure of claim 12 wherein said threaded conductive member is electrically grounded.
- 15. The helical coil deflection structure of claim 12 wherein said threads of said threaded conductive member comprise male threads.
- 16. The helical coil deflection structure of claim 12 wherein said threads of said threaded conductive member comprise female threads.
- 17. A helical coil deflection structure for a cathode ray tube comprising:
- a) A conductor having a circular cross section, said conductor wound about an axis into a helical deflection coil having a fixed number of turns of a given pitch, extending along said axis between two ends of said coil;
- b) A threaded conductive member coaxially aligned with said coil about said axis, and electrically grounded and having:
- i) At least one more thread than the number of turns of said coil;
- ii) A thread pitch substantially the same as said coil pitch;
- iii) A crown defined on each thread and a root defined between adjacent threads having a length greater than a respective diameter of said circular conductors;
- iv) A respective notch formed in each of said threads to define an electron beam passageway having an axis aligned parallel to said axis;
- whereby each turn of said coil is located within a respective spaced defined by said root length and a distance between said root and said thread crown to thereby electrically shield at least three equals portion of said circular cross section of each of said turns of said coil from adjacent turns to said coil;
- c) An electrically conducting member which contacts said crowns of said threads on said threaded member, whereby a remaining fourth portion of said circular cross section of each turn in said coil, adjacent to a line between the crowns of adjacent threads of said threaded member, is also shielded by said electrically conductive member; and
- d) Means for making electrical connection to each end of said coil.
- 18. The helical coil deflection structure of claim 17 which further comprises means for providing mechanical support at each end of said helical coil and said threaded member wherein said helical coil is located in the spaces defined between adjacent threads of said threaded member and between the roots and crowns of said threaded member, each said space electrically separating said coil from said threaded member so as to prevent additional capacitive coupling between said coil and said electrically grounded threaded member and to prevent the emission of disruptive molecules when said structure is exposed to high temperature and high vacuum.
Government Interests
The invention described herein arose in the course of, or under, Contract No. DE-AC08-83NV10282 between the U.S. Department of Energy and EG&G Energy Measurements, Incorporated.
US Referenced Citations (16)
Foreign Referenced Citations (1)
Number |
Date |
Country |
788223 |
Dec 1980 |
SUX |