US2206125A - Magnetic deflecting system for braun tubes - Google Patents

Magnetic deflecting system for braun tubes Download PDF

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Publication number
US2206125A
US2206125A US80886A US8088636A US2206125A US 2206125 A US2206125 A US 2206125A US 80886 A US80886 A US 80886A US 8088636 A US8088636 A US 8088636A US 2206125 A US2206125 A US 2206125A
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United States
Prior art keywords
coils
coil
deflection
electron beam
ray
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Expired - Lifetime
Application number
US80886A
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English (en)
Inventor
Ruska Ernst
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.)
FIRM OF FERNSEH AG
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FIRM OF FERNSEH AG
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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
    • H01J29/762—Deflecting by magnetic fields only using saddle coils or printed windings
    • 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

Definitions

  • the present invention relates to all types of cathode ray tubes in which the electron beam is deflected in two directions by means of magnetic fields, and relates more particularly to arrangements in which two magnetic fields disposed perpendicularly with respect to each other are produced at the same or nearly the same point on the axis of the deflected electron beam.
  • Cathode ray tubes generally possess a source of 10 an electron beam of defined cross-section and a screen against which the electron beam is directed.
  • a deflecting system is associated with such tubes to deflect the beam across the screen and produce a deflection pattern.
  • Such deflecting systems usually consist of a pair of coils for each direction of deflection. The coils are placed around the tube and alternating currents pass therethrough to produce magnetic fields of varying intensity to deflect the electron beam.
  • an object of the present invention to provide a new and improved deflecting system. It is a further object of the present invention to provide a deflecting system which produces a substantially homogeneous magnetic fleld throughout the entire cross-sectional area through which the electron beam is deflected.
  • a further object of the present invention is to provide a deflecting system composed of two individual systems in which each system produces linear deflection at a constant sensitivity of deflection independently of the other system.
  • a still'further object of the present invention is to provide a deflecting system in which substantially the entire cross-section of the magnetic field is limited to the cross-sectional area de- 40 scribed by the electron beam when deflected by means of the present system so as to obtain a high degree of sensitivity as well as small inductivity in the system.
  • a system including two long coils is provided, whereby a homogeneous field is produced inside each long coil independently of its cross-sectional shape.
  • the homogeneity of such fields is utilized for deflection purposes by causing the ray to enter and leave the field inside such a coil through the side walls thereof, and in a direction perpendicular to the axis of said coil.
  • the coils may, in such case, be of circular or rectangular cross section, square, or, if desired,
  • the ray passage openings must 5 be left free by suitably crimping the coils during winding.
  • the system according to the invention may be disposed outside, or in a particularly advantageous manner inside an evacuated electron ray tube. 10
  • the advantage of the system resides in its great sensitivity (low control current consumption) accompanied by the greatest possible freedom from inductivity (reduced control distortion) as well as the great homogeneity of the control field 1 (exact, constant system-sensitivity over the entire deflectional area).
  • Fig. 1 is an arrangement used hitherto showing two coaxial deflection coils.
  • Fig. 2 shows the field path in a long deflecting coil having a homogeneous field.
  • Fig. 3 depicts an embodiment of a deflecting 25 coil system in accordance with the invention.
  • Figs. 4 and 5 show a cross section and plan View respectively of a further embodiment of a coil system.
  • Fig. 3 two coils I and 2 are provided which intersect each other at right angles.
  • the axes 40 of the coils lie in a plane perpendicular to the axis of the electron beam.
  • the cross section of the coils in this case is chosen as trapezoidal.
  • the cross sectional shapes of both coils are similar to each other and the coils intersect each other 45 in such a manner that their longitudinal axes intersect the axis of the electron beam at the same point.
  • the axial extent of both coils may be greater than the greatest extent of the coil cross section.
  • the entire double coil system has the shape of a square truncated section of a pyramid wherein each two opposite sides of the pyramid pertain to one coil winding.
  • the coil 3 is disposed on a framework 4 made of heat resisting material, e. g. ceramic material or glass.
  • the frame 4 preferably contains two plates 5, which are square, or else shaped corresponding to the dimensions of the deflection pattern produced by the electron beam. These plates receive and retain the coil windings wherefore their edges are provided with saw-tooth shaped serrations.
  • the plate through which the electron beam enters into the deflecting system is provided with a small hollow cylinder 6, whereas on the plate through which the beam emerges from the deflecting system is provided with a raised retaining frame I which is formed as a continuation of the frame 4 and which surrounds the cross-section from which the beam emerges.
  • the frame I may have a square shape or a shape according to the deflection pattern of the electron beam.
  • the convolutions are coiled sidewise around the raised edges of the members 6 and 1. The edges serve preferably also to attach the deflecting system to a supporting means (not shown).
  • the coils consist of turns of copper wire, preferably provided with an oxide or carbonate coating for insulation purposes, this coating being adapted to withstand the heating temperature of the tube in case the deflecting system is operated inside the tube in a Vacuum.
  • Such coatings can be produced, for example, by means of a glowing furnace or an open flame and a regulated supply of air or oxygen, or by the admission of carbon dioxide.
  • the wire may however also be insulated by applying to its surface a coating of waterglass mixed with insulating particles, e. g. chalk.
  • the magnetic lines of force traversing the inside of the coils are also present on the outside of the coils and form complete loops surrounding the coils.
  • the electron beam will also be influenced by the fields on the inside of the coils. This influence should be prevented since these edge fields are non-homogeneous. They cause a deconcentration of the electron beam on the outer portions of the deflection pattern produced by the system.
  • the cross-section of the concentrated electron beam then assumes the aspect of two small wedges standing tip to tip on each other.
  • the magnetic flux on the outside of the coils should be guided by means of a ferromagnetic material into the same plane, perpendicular to the axis of the electron beam, as the main flux, i. e.
  • Fig. 4 uses a closed ferromagnetic hysteresis-free and loss-less jacket (not shown) which likewise has the shape of a truncated pyramid section with or without bored-- out bottom. and top plates and which is disposed over the windings so that the wires of the windings lie close thereto.
  • the use of granulated lowloss materials is also feasible because of the high frequency of the deflection.
  • Such a jacket aids in producing a strongly homogeneous field inside each pyramidic coil and reduces the inductivity to the minimum possible value corresponding to the required beam deflection and beam. intensity and at the same time increases the sensitivity to the maximum value. In case longer individual coils are used, as shown in Fig. 3, the jacket likewise surrounds the entire system.
  • a ray deflecting system comprising two axially intersecting symmetrically cross-sectioned and congruent coils disposed normal each to the other, said coils having a trapezoidal cross-sectional form.
  • means for insulating electrically said coils comprising a mixture of heatresistant binding and non-conducting material.
  • a cathode ray device comprising an envelope, a ray deflecting system including a coil form in said envelope and having an axial passage therethrough for the ray, and windings wound on said form normal to each other, one of said windings enabling deflection of said ray in one direction, another of said windings enabling deflection of said ray in another direction.
  • a cathode ray device comprising an envelope, a ray deflecting system including a coil form. of truncated shape having a small end and a large end, said coil form being disposed in said envelope with its smaller end facing the source of said ray and having an axial passage therethrough sufliciently large at the larger end of said coil form to permit unobstructed deflection of said ray, windings wound on said form normal to each other, one of said windings enabling deflection of said ray in one direction, another of said windings enabling deflection of said ray in another direction.
  • a ray deflecting system for a cathode ray device comprising a coil form of truncated shape having a small end and a large end and an axial passage therethrough, said passage being larger at the larger end of said form than at the smaller end, and a pair of windings wound on said form normal to each other.
  • a ray deflecting system for a cathode ray device comprising a coil form of truncated shape having a small end and a large end and an axial passage therethrough, said passage being larger at the large end of said form than at the small end, a pair of windings wound on said form normal to each other, said form having a plurality of serrations to receive said windings.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Particle Accelerators (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US80886A 1935-05-23 1936-05-20 Magnetic deflecting system for braun tubes Expired - Lifetime US2206125A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE475527X 1935-05-23
DEF7638D DE901684C (de) 1935-05-23 1935-10-25 Spulenanordnung zur Ablenkung von Kathodenstrahlen

Publications (1)

Publication Number Publication Date
US2206125A true US2206125A (en) 1940-07-02

Family

ID=25944266

Family Applications (2)

Application Number Title Priority Date Filing Date
US80886A Expired - Lifetime US2206125A (en) 1935-05-23 1936-05-20 Magnetic deflecting system for braun tubes
US94434A Expired - Lifetime US2186595A (en) 1935-05-23 1936-08-05 Deflecting coil

Family Applications After (1)

Application Number Title Priority Date Filing Date
US94434A Expired - Lifetime US2186595A (en) 1935-05-23 1936-08-05 Deflecting coil

Country Status (4)

Country Link
US (2) US2206125A (fr)
DE (2) DE724550C (fr)
FR (2) FR806673A (fr)
GB (2) GB475527A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455171A (en) * 1943-09-08 1948-11-30 Hartford Nat Bank & Trust Co System for magnetic deflection in cathode-ray tubes

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL149134B (nl) * 1949-10-04 Snam Progetti Werkwijze voor de bereiding van ammonium- en alkalimetaalpyrosulfaten.
US2570425A (en) * 1950-05-26 1951-10-09 Philco Corp Deflection yoke
US2793311A (en) * 1951-04-18 1957-05-21 Du Mont Allen B Lab Inc Deflection yoke
US2785329A (en) * 1952-07-10 1957-03-12 Arthur L Tirico Expanded yoke for deflecting convergent beams
US2901665A (en) * 1956-02-13 1959-08-25 Rca Corp Cathode ray tube deflection yoke
US3115544A (en) * 1956-04-25 1963-12-24 Hazeltine Research Inc Color-television receivers and deflection yokes
DE2234122C3 (de) * 1972-07-12 1982-01-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Sattelspulenanordnung zur magnetischen Ablenkung mehrerer Elektronenstrahlen
DE4109274A1 (de) * 1991-03-21 1992-09-24 Thomson Brandt Gmbh Farbbildroehre
JP2004259507A (ja) * 2003-02-25 2004-09-16 Mitsubishi Electric Corp 陰極線管

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455171A (en) * 1943-09-08 1948-11-30 Hartford Nat Bank & Trust Co System for magnetic deflection in cathode-ray tubes

Also Published As

Publication number Publication date
FR47720E (fr) 1937-06-22
US2186595A (en) 1940-01-09
GB475527A (en) 1937-11-22
GB475539A (en) 1937-11-22
DE724550C (de) 1942-10-01
FR806673A (fr) 1936-12-22
DE901684C (de) 1954-01-14

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