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US 5,172,029 AGranted
Shielded helix traveling wave cathode ray tube deflection structure
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsNeil J. Norris, Charles L. Hudson
Life of this patent
Estimating the term…
Abstract
Various embodiments of a helical coil deflection structure of a CRT are described and illustrated which provide shielding between adjacent turns of the coil on either three or four sides of each turn in the coil. Threaded members formed with either male or female threads and having the same pitch as the deflection coil are utilized for shielding the deflection coil with each turn of the helical coil placed between adjacent threads which act to shield each coil turn from adjacent turns and to confine the field generated by the coil to prevent or inhibit cross-coupling between adjacent turns of the coil to thereby prevent generation of fast fields which might otherwise deflect the beam out of time synchronization with the electron beam pulse.
Claims18
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.
1 more element
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.
2 more elements
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.
6 more elements
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.
7 more elements
Dependencies are inferred from the claim text.