US3694781A - Toroidal type deflection coils for cathode ray tubes - Google Patents

Toroidal type deflection coils for cathode ray tubes Download PDF

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Publication number
US3694781A
US3694781A US110724A US3694781DA US3694781A US 3694781 A US3694781 A US 3694781A US 110724 A US110724 A US 110724A US 3694781D A US3694781D A US 3694781DA US 3694781 A US3694781 A US 3694781A
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United States
Prior art keywords
coil
core
fore
cathode ray
wound
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Expired - Lifetime
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US110724A
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English (en)
Inventor
Eiji Sawada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denki Onkyo Co Ltd
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Denki Onkyo Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • H01J29/764—Deflecting by magnetic fields only using toroidal windings

Definitions

  • This invention relates to a toroidal deflection coil for cathode ray tubes.
  • a deflection yoke or coil capable of producing a distribution of a deflection field suitable for a particular cathode ray tube by considering the configuration of the tube or the space through which a electron beam passes.
  • a deflection yoke capable of producing a uniform field distribution is suitable for a narrow deflection angle cathode ray tube whereas a deflection the tube.
  • Deflection coils are classified into two types, that is thesaddle type wherein the deflection coil is comprised by two spaced apart coil sides extending substantially in parallel with the tube axis and two arcuate coil sides interconnecting the ends of the first mentioned coil sides and extending circumferentially of the tube neck, and
  • the coil conductor is wound helically about a toroidal core concentric with the tube neck.
  • the saddle type defection coils are generally used as the horizontal deflection coils and the toroidal type deflection coil are used as the vertical deflection coils of television receiving tubes.
  • the distribution of the deflection magnetic field should be of the so-called bobbin type distorted field in order to minimize the focusing error.
  • the saddle type deflection coil is manufactured by inserting the conductors in grooves in a metal form which are distributed to create the desired field distribution, such adjustment of the field distribution can be readily made by the suitable design of the pattern of the grooves without the necessity of changing the method of winding.
  • the bobbin type distorted deflection field can be readily created by varying in the longitudinal direction the width of gap W, generally termed a window, defined between conductor groups
  • the toroidal type deflection coil is fabricated by the steps of supporting the toroidal core by a rotary arbor extending through the core and helically winding the conductor about the core by rotating the rotary arbor it isimpossible to vary the distribution or density of the conductor along any arcurate segment on a circle about the tube axis.
  • the conductor 2 when a conductor 2 is wound spirally about a funnel shaped core 1 having a larger fore end diameter d, than the rear end diameter d, the conductor 2 forms portions of the outer surface of a frustum of a cone between the fore and aft edges 11 and 12 so that the distribution of the conductor in planes perpendicular to the axis 0 x are similar.
  • a more specific object of this invention is to provide an improved toroidal type deflection coil suitable for use in a color television receiving tube capable of creating desirable field distributions with a minimum focusing error.
  • a toroidal type deflection coil for use in a cathode ray tube, particularly a color television cathode ray tube utilizing a plurality of electron beams of the type comprising a funnel shaped magnetic core and a coil wound about the core to create a magnetic field having different distribution at the fore edge and the rear edge of the core, portions of the peripheries of the fore and rear edges of the core on which the coil is wound take the form of curves of different radii of curvature.
  • the above described portion of the fore edge is in the form of an ellipse or an oblong circle whereas those of the rear edge is in the form of a circle.
  • FIG. 1 is a perspective view of a saddle type deflection coil
  • FIG. 2 is a diagrammatic end view of a prior saddle type deflection coil showing the distribution of the coil conductor
  • FIG. 3 shows a longitudinal section of a prior art toroidal type toroidal deflection coil
  • FIG. 4 shows an end view of one half of the toroidal type deflection coil shown in FIG. 3 and is useful to explain a prior method of winding the deflection coil
  • FIG. 5 shows an end view, partly in transverse section of a toroidal deflection coil embodying the invention.
  • the inner and outer peripheries of the fore edge 11 and the rear edge 12 of a cylindrical core 1 of magnetic material, ferrite for example, on which the coil is to be wound are formed by curves of different radii of curvature.
  • the fore edge takes the form of an oblong circle or an ellipse whereas the rear edge 12 a circle.
  • this invention provides a novel toroidal type deflection coil for color cathode ray tubes capable of producing different field distributions at the front and rear edges of the coil and can be readily wound with a simple prior art toroidal coil winding machine. Further, it is possible to vary in any desired manner the field distribution along the longitudinal axis of the coil by continuously varying the cross sectional configuration of the coil along the longitudinal axis thereof from the fore edge to the rear edge, thus providing a novel toroidal deflection coil manifesting an ideal field distribution having lesser focusing error than the deflection coil of the prior design requiring complicated method and apparatus for winding.
  • fy pe deflection coil for use in a cathode ray tube utilizing a plurality of electron beams of the type comprising a funnel shaped magnetic core and a coil wound about said core to create a magnetic field having different distributions at the fore edge and the rear edge of said core characterized in that portions of the inner and outer peripheries of said fore edge of said core on which said coil is wound take the form of curves of different curvature than portions of the inner and outer peripheries of said rear edge of said core on which said coil is wound.

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US110724A 1970-01-30 1971-01-28 Toroidal type deflection coils for cathode ray tubes Expired - Lifetime US3694781A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45008193A JPS4914764B1 (enrdf_load_stackoverflow) 1970-01-30 1970-01-30

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US3694781A true US3694781A (en) 1972-09-26

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US110724A Expired - Lifetime US3694781A (en) 1970-01-30 1971-01-28 Toroidal type deflection coils for cathode ray tubes

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US (1) US3694781A (enrdf_load_stackoverflow)
JP (1) JPS4914764B1 (enrdf_load_stackoverflow)
DE (1) DE2104281A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2735749A1 (de) * 1976-08-12 1978-02-16 Videon Sa Toroid-ablenkspulenwicklung fuer eine inline-farbbildroehre mit grossem ablenkwinkel und grossem bildschirm
WO2002075770A3 (en) * 2001-03-16 2003-10-02 Koninkl Philips Electronics Nv Deflection yoke

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50104881A (enrdf_load_stackoverflow) * 1974-01-21 1975-08-19
JPS61165636U (enrdf_load_stackoverflow) * 1985-04-01 1986-10-14

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3081420A (en) * 1960-02-11 1963-03-12 Hazeltine Research Inc Deflection yoke
US3246192A (en) * 1962-06-19 1966-04-12 Muter Company Deflection yoke core having non-cylindrical winding bearing surface

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3081420A (en) * 1960-02-11 1963-03-12 Hazeltine Research Inc Deflection yoke
US3246192A (en) * 1962-06-19 1966-04-12 Muter Company Deflection yoke core having non-cylindrical winding bearing surface

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2735749A1 (de) * 1976-08-12 1978-02-16 Videon Sa Toroid-ablenkspulenwicklung fuer eine inline-farbbildroehre mit grossem ablenkwinkel und grossem bildschirm
WO2002075770A3 (en) * 2001-03-16 2003-10-02 Koninkl Philips Electronics Nv Deflection yoke
US6696779B2 (en) 2001-03-16 2004-02-24 Koninklijke Philips Electronics N.V. Deflection yolk

Also Published As

Publication number Publication date
JPS4914764B1 (enrdf_load_stackoverflow) 1974-04-10
DE2104281A1 (de) 1971-09-09

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