US2713131A - Deflection coil arrangement for cathode ray tubes - Google Patents

Deflection coil arrangement for cathode ray tubes Download PDF

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US2713131A
US2713131A US295946A US29594652A US2713131A US 2713131 A US2713131 A US 2713131A US 295946 A US295946 A US 295946A US 29594652 A US29594652 A US 29594652A US 2713131 A US2713131 A US 2713131A
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field
deflection
coil
core
windings
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US295946A
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Urtel Rudolf
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International Standard Electric Corp
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International Standard Electric Corp
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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
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
    • H03K4/39—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as an amplifier
    • H03K4/43—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as an amplifier combined with means for generating the driving pulses

Definitions

  • Deflection coil systems of two principal types are generally known for use in controlling the deflection of cathode ray beams.
  • the windings of the coil are such that a relatively weak external field is produced on this type.
  • the control field extends on a small distance from the end of the deflection coil arrangement. This small distance of extension is helpful on the cathode end of the tube in that it does not produce unwanted eddy currents, which may tend to disturb the function of the beam.
  • the control does not extend any appreciable distance beyond the coil in the direction of the reproduction screen.
  • a second well known form of deflection system wherein the deflection windings provide closed rings about an annular core. With this type of arrangement there is a considerable external field and the deflection field itself extends a substantial distance from both ends of the deflection system. This has the advantage of greater control of the beam in the direction of the screen but the disadvantage that the eddy currents are set up in the cathode and through portions of the system. These eddy currents may produce detrimental eflects.
  • a deflection coil system which has the advantage of producing a substantially extending field in the direction of electron beam control and a rapidly decaying field in the direction of the cathode and other electrodes.
  • Figs. 1 and la show a diagrammatic perspective and a diagrammatic longitudinal section illustrating the well known form of coil winding and the field produced thereby respectively;
  • Figs. 2 and 2a illustrate a second known form of deflection coil and deflecting pattern similar to those of Fig. 1;
  • Figs. 3 and 3a show diagrammatic perspective and a longitudinal section similar to Figs. 1 and 2;
  • Figs. 4 and 4a illustrate an alternative winding arrangement and field pattern system similar to that shown in Fig. 3.
  • the first shape of windings is known as the so-called shell-core coil, the coils of which consist of individual coil-packs 1 and 2 with closed windings, and in which those winding components, not contributing to the deflection, proceed in a plane perpendicular to the tube axis and partly embrace the neck of the tube.
  • the iron core in of the winding embraces the coils as a shell.
  • Such a coil arrangement with its field line pattern is shown in Figs. 1 and la.
  • this shape of coil exhibits a weak external field which will produce only small eddy currents in the neighboring parts, such as the axial focussing coil, the magnet and/or the shieldings.
  • the field lines cross each other in the plane through the axis in field direction at the saddle point S closely in front of the coil, so that a rapidly decaying field is formed in axial direction.
  • this quickly decaying field has the advantage of a small coupling uf eddy current, on the screen-sided end of the coil, however, the disadvantage that the extension of the field is small in the useful direction.
  • Another drawback of this kind of coils is the poor optico-electronical quality.
  • the second shape of windings is known as the socalled ring-core coil, consisting of an iron yoke body embracing the ray and of windings 3 and 4, embracing the cross-section of this yoke.
  • a coil arrangement with its field lines is represented in Figs. 2 and 2a.
  • This shape of coil is featured by an axially expanded field in useful direction, because the saddle points fall away.
  • the coil is good, but has the disadvantage that the extended field in the axial direction causes, on the cathode end, more extensive eddy currents with the focussing device. Also the currents energize a strong outer field in the outer winding parts, which again causes a greater coupling of eddy currents to the shielding.
  • the deflecting coil arrangement according to the invention is characterized by such a form of windings that the features of the ring-core winding, extended field in useful direction, strong outer field, are combined with the features of the shell-core winding (quickly decaying field in axial direction, weak outer field).
  • FIG. 3 An example for achieving this field distribution is represented in Fig. 3.
  • a shell-core winding 6 is provided within the iron core 5 .
  • the wire thereof is bent back so the cross-connection 7 overlies the end as shown.
  • the winding components which do not contribute to the deflection are spaced from the front of the core and the saddle point S of the field lines of the winding is removed outwards on this side of the coil and thereby the field is extended in useful direction.
  • a coil which produces on the screen side of the winding an extended field in useful direction, similar to the ring-core coil, but which has a quickly decaying field in axial direction on the cathode side of the winding, similar to the actual shellcore coil of Fig. 1.
  • the part of the winding spaced from the end weakens the outer field, as may be seen from the field line pattern, thus weakening the eddy currents in the shielding.
  • Figs. 4 and 4a is illustrated another embodiment of the deflection coil arrangement similar to that shown in Fig. 2.
  • the other end 8 of the winding is also bent back so that its cross-connector 8 also overlies the end of the core as shown.
  • This crossconnector 8 may be arranged to be near the end of the core so that it will also have some influence on the extension of the deflection field in this direction.
  • the spacing between the cross connectors 7 and 8 may be adjusted to give the desired control to the field longitudinally of the core and winding. It will be realised that the longitudinal extension external of the core will have a similar eflect on the deflection to that produced by the ring of windings shown in Fig.
  • combination comprising a closed hollow cylindrical core of magnetic material, and a winding on said core for producing deflection fields, said winding having a first portion comprising wires extending longitudinally internally of said core, a second portion adjacent one end of said core and extending substantially circumferentially and externally thereof for interconnecting said wires, said second portion being positioned intermediate the ends of said core. to provide a substantial extension of said deflection fields axially of said core, and a third portion adjacent a second end of said core and extending substantially circumferentially of the axis and externally to produce a rapid decay of said deflection fields axially of said core.
  • said second portion comprises an interconnecting wire arranged on the outer surface of said core and spaced from one end thereof, the ends of said interconnecting wire extending substantially parallel to the axis of said, core and being connected to said longitudinal wires.
  • said third portion comprises a wire extending about the outer surface of said core traversely of the axis and spaced a distance from the other end less than the spacing of said second portion from its corresponding end and having its opposite ends extending substantially parallel to said axis and connected to said longitudinal wires.

Landscapes

  • Details Of Television Scanning (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Amplifiers (AREA)

Description

R. URTEL July 12, 1955 DEFLECTION COIL ARRANGEMENT FOR CATHODE RAY TUBES 2 Sheets-Sheet 1 Filed June 27, 1952 FIG. l0.
FlG. I.
INVENTOR. A? U/PTEL HTTO/P/VEY July 12, 1955 R. URTEL 2,71
DEFLECTION COIL. ARRANGEMENT FOR CATHODE RAY TUBES Filed June 27, 1952 2 Sheets-Sheet 2 FIG. 30.
FIG. 40.
IN VEN TOR. A. [/ATEZ.
HTTO/P/VE) nite States Patent 1 iiice DEFLEQTIQN COIL ARRANGEMENT FOR CATHODE RAY TUBES Rudolf Urtel, Pforzheim, Germany, assignor to International Standard Electric Corporation, New York, N. L, a corporation of Delaware Application June 27, 1952', Serial No. 295,946 Claims priority, application Germany June 29, 1951 3 Qlaims. (Cl. 317--200) This invention relates to deflection coils and more particularly to deflection coil windings suitable for use in reproduction cathode ray tubes for television receivers.
Deflection coil systems of two principal types are generally known for use in controlling the deflection of cathode ray beams. In one of these types the windings of the coil are such that a relatively weak external field is produced on this type. Also it has the disadvantage that at both ends of the deflection coil system the control field extends on a small distance from the end of the deflection coil arrangement. This small distance of extension is helpful on the cathode end of the tube in that it does not produce unwanted eddy currents, which may tend to disturb the function of the beam. On the other hand, it is a disadvantage in that the control does not extend any appreciable distance beyond the coil in the direction of the reproduction screen.
A second well known form of deflection system is provided wherein the deflection windings provide closed rings about an annular core. With this type of arrangement there is a considerable external field and the deflection field itself extends a substantial distance from both ends of the deflection system. This has the advantage of greater control of the beam in the direction of the screen but the disadvantage that the eddy currents are set up in the cathode and through portions of the system. These eddy currents may produce detrimental eflects.
According to this invention there is provided a deflection coil system which has the advantage of producing a substantially extending field in the direction of electron beam control and a rapidly decaying field in the direction of the cathode and other electrodes.
Accordingly, it is an object of this invention to provide a deflection coil system for cathode ray tubes in which the windings on an annular core are arranged so that at one end of the core a portion of the windings produces an extended longitudinal deflection field on the axis of the core and at the other end a rapidly decaying of the deflection field is produced by another portion of the windings.
The above-mentioned and other features and objects of this invention and the manner of attaining them will become more apparent and the invention itself will be best understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings, in which Figs. 1 and la show a diagrammatic perspective and a diagrammatic longitudinal section illustrating the well known form of coil winding and the field produced thereby respectively;
Figs. 2 and 2a illustrate a second known form of deflection coil and deflecting pattern similar to those of Fig. 1;
Figs. 3 and 3a show diagrammatic perspective and a longitudinal section similar to Figs. 1 and 2;
Figs. 4 and 4a illustrate an alternative winding arrangement and field pattern system similar to that shown in Fig. 3.
2,713,131 Patented July 12, 1955 Two principal shapes of windings are known for the deflection of the cathode ray beam in television tubes. The first shape of windings is known as the so-called shell-core coil, the coils of which consist of individual coil-packs 1 and 2 with closed windings, and in which those winding components, not contributing to the deflection, proceed in a plane perpendicular to the tube axis and partly embrace the neck of the tube. The iron core in of the winding embraces the coils as a shell. Such a coil arrangement with its field line pattern is shown in Figs. 1 and la. The advantage of this shape of coil is that it exhibits a weak external field which will produce only small eddy currents in the neighboring parts, such as the axial focussing coil, the magnet and/or the shieldings. The field lines cross each other in the plane through the axis in field direction at the saddle point S closely in front of the coil, so that a rapidly decaying field is formed in axial direction. On the end of the coil adjacent the cathode this quickly decaying field has the advantage of a small coupling uf eddy current, on the screen-sided end of the coil, however, the disadvantage that the extension of the field is small in the useful direction. Another drawback of this kind of coils is the poor optico-electronical quality.
The second shape of windings is known as the socalled ring-core coil, consisting of an iron yoke body embracing the ray and of windings 3 and 4, embracing the cross-section of this yoke. Such a coil arrangement with its field lines is represented in Figs. 2 and 2a. This shape of coil is featured by an axially expanded field in useful direction, because the saddle points fall away. Optically the coil is good, but has the disadvantage that the extended field in the axial direction causes, on the cathode end, more extensive eddy currents with the focussing device. Also the currents energize a strong outer field in the outer winding parts, which again causes a greater coupling of eddy currents to the shielding.
The deflecting coil arrangement according to the invention is characterized by such a form of windings that the features of the ring-core winding, extended field in useful direction, strong outer field, are combined with the features of the shell-core winding (quickly decaying field in axial direction, weak outer field).
Some embodiments of the deflecting coil arrangement according to the invention are represented in the Figs. 3 to 6 of the drawing.
In each of these examples only one set of deflection windings is illustrated since the showing of both sides of deflection windings would render the illustration confusing. It may be considered that the windings as illustrated in these figures correspond to other vertical or horizontal section windings of a television receiver cathode ray tube. it will be clearly understood that the other set of windings would be arranged on the core at 90 spacing to the windings shown here and will serve for the co-ordinate deflection.
As pointed out already, it is desired to generate an extended useful field in direction of the screen and to have a quickly decaying field in the direction of the cathode, in order to keep the eddy currents in the focussing equipment as small as possible and furthermore, if possible, to keep the external field small also.
An example for achieving this field distribution is represented in Fig. 3. Within the iron core 5 a shell-core winding 6 is provided. At one end of the windings the wire thereof is bent back so the cross-connection 7 overlies the end as shown. By this arrangement the winding components which do not contribute to the deflection are spaced from the front of the core and the saddle point S of the field lines of the winding is removed outwards on this side of the coil and thereby the field is extended in useful direction. In this way one obtains a coil, which produces on the screen side of the winding an extended field in useful direction, similar to the ring-core coil, but which has a quickly decaying field in axial direction on the cathode side of the winding, similar to the actual shellcore coil of Fig. 1. Moreover, the part of the winding spaced from the end weakens the outer field, as may be seen from the field line pattern, thus weakening the eddy currents in the shielding.
In Figs. 4 and 4a is illustrated another embodiment of the deflection coil arrangement similar to that shown in Fig. 2. However, in this arrangement the other end 8 of the winding is also bent back so that its cross-connector 8 also overlies the end of the core as shown. This crossconnector 8 may be arranged to be near the end of the core so that it will also have some influence on the extension of the deflection field in this direction. However, the spacing between the cross connectors 7 and 8 may be adjusted to give the desired control to the field longitudinally of the core and winding. It will be realised that the longitudinal extension external of the core will have a similar eflect on the deflection to that produced by the ring of windings shown in Fig. 2, but will be modified by the cross connections similar to the known form of Fig. 1 to a controllable extent. Thus, there can be provided with this system an adjustable control of the extension of the field longitudinally of the axis of the deflection system. At the same time, the external field due to the windings radially of the axis is considerably reduced.
While I have described above the principles of my invention in connection with specific apparatus, it is to be clearly understood that this description is made only by way of example and not as a limitation to the scope of my invention as set forth in the objects thereof and in the accompanying claims.
What is claimed is:
1. In a deflection coil system for cathode ray tubes for producing an extended control field axially of the coil system at one end thereof, and a quickly decaying field axially of said coil system at the other end thereof, the
combination comprising a closed hollow cylindrical core of magnetic material, and a winding on said core for producing deflection fields, said winding having a first portion comprising wires extending longitudinally internally of said core, a second portion adjacent one end of said core and extending substantially circumferentially and externally thereof for interconnecting said wires, said second portion being positioned intermediate the ends of said core. to provide a substantial extension of said deflection fields axially of said core, and a third portion adjacent a second end of said core and extending substantially circumferentially of the axis and externally to produce a rapid decay of said deflection fields axially of said core.
2. In a deflection coil system according to claim 1, the combination wherein said second portion comprises an interconnecting wire arranged on the outer surface of said core and spaced from one end thereof, the ends of said interconnecting wire extending substantially parallel to the axis of said, core and being connected to said longitudinal wires.
3. In a deflection coil system according to claim 2, the combination wherein said third portion comprises a wire extending about the outer surface of said core traversely of the axis and spaced a distance from the other end less than the spacing of said second portion from its corresponding end and having its opposite ends extending substantially parallel to said axis and connected to said longitudinal wires.
References Citedin the file of this patent UNITED STATES PATENTS 2,229,977 Kenyon Jan. 28, 1941 2,237,651 Bruche Apr. 8, 1941 2,240,606 Bobb May 6, 1941 2,333.806 Mauerer Nov. 9, 1943 2,455,171 Haantjes Nov. 30, 1948 2,565,331 Torsch Aug. 21, 1951 2,570,425 Bocciarelli Oct. 9, 1951
US295946A 1950-06-25 1952-06-27 Deflection coil arrangement for cathode ray tubes Expired - Lifetime US2713131A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DEL2761A DE946557C (en) 1950-06-25 1950-06-25 Circuit arrangement for generating saw tooth-shaped pulses
DEL6266A DE941987C (en) 1950-06-25 1950-11-11 Circuit arrangement for generating saegezahnfoermiger currents
DEL9455A DE875970C (en) 1950-06-25 1951-06-29 Deflection coil assembly for cathode ray tubes, preferably for television purposes

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US2713131A true US2713131A (en) 1955-07-12

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Family Applications (4)

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US230098A Expired - Lifetime US2654050A (en) 1950-06-25 1951-06-06 Saw-tooth wave generator
US255100A Expired - Lifetime US2797316A (en) 1950-06-25 1951-11-06 Circuit arrangement generating sawtooth current waves
US255353A Expired - Lifetime US2771563A (en) 1950-06-25 1951-11-08 Cathode ray deflection coils
US295946A Expired - Lifetime US2713131A (en) 1950-06-25 1952-06-27 Deflection coil arrangement for cathode ray tubes

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Application Number Title Priority Date Filing Date
US230098A Expired - Lifetime US2654050A (en) 1950-06-25 1951-06-06 Saw-tooth wave generator
US255100A Expired - Lifetime US2797316A (en) 1950-06-25 1951-11-06 Circuit arrangement generating sawtooth current waves
US255353A Expired - Lifetime US2771563A (en) 1950-06-25 1951-11-08 Cathode ray deflection coils

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US (4) US2654050A (en)
BE (4) BE512424A (en)
CH (2) CH295824A (en)
DE (3) DE946557C (en)
FR (5) FR1038963A (en)
GB (3) GB687469A (en)

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US2881342A (en) * 1957-09-23 1959-04-07 Arthur C Stocker Deflection apparatus
US4786838A (en) * 1986-06-10 1988-11-22 U.S. Philips Corporation Electromagnetic deflection unit directly wound on a support

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US2881341A (en) * 1955-04-12 1959-04-07 Motorola Inc Deflection yoke
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US2935635A (en) * 1957-11-18 1960-05-03 Philco Corp Cathode ray tube display system
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US3084333A (en) * 1958-09-16 1963-04-02 Air Reduction Method and apparatus for transmitting intelligence
DE1188737B (en) * 1959-11-10 1965-03-11 Reichelsheimer Kunststoffbetr Wide-angle deflection coil system for television picture tubes with a ferrite core which is surrounded by an insulating jacket, and a method for manufacturing the insulating jacket
US3117258A (en) * 1962-02-08 1964-01-07 Gen Electric Toroidal deflection yoke winding
JPS4876812U (en) * 1971-12-22 1973-09-22
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US2881342A (en) * 1957-09-23 1959-04-07 Arthur C Stocker Deflection apparatus
US4786838A (en) * 1986-06-10 1988-11-22 U.S. Philips Corporation Electromagnetic deflection unit directly wound on a support

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FR64102E (en) 1955-10-21
CH314127A (en) 1956-05-31
GB691717A (en) 1953-05-20
FR65229E (en) 1956-02-07
DE946557C (en) 1956-08-02
FR64257E (en) 1955-11-09
FR65235E (en) 1956-02-07
BE518173A (en)
BE507000A (en)
BE511213A (en)
US2771563A (en) 1956-11-20
DE941987C (en) 1956-04-26
DE875970C (en) 1953-05-07
US2797316A (en) 1957-06-25
GB687469A (en) 1953-02-11
GB733923A (en) 1955-07-20
CH295824A (en) 1954-01-15
BE512424A (en)
FR1038963A (en) 1953-10-02
US2654050A (en) 1953-09-29

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