US2831135A - Electromagnetic deflection means - Google Patents

Electromagnetic deflection means Download PDF

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Publication number
US2831135A
US2831135A US440154A US44015454A US2831135A US 2831135 A US2831135 A US 2831135A US 440154 A US440154 A US 440154A US 44015454 A US44015454 A US 44015454A US 2831135 A US2831135 A US 2831135A
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United States
Prior art keywords
deflection
sides
wire
electromagnetic
neck
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Expired - Lifetime
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US440154A
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English (en)
Inventor
Hanlet Jacques Marie Noel
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Visseaux J SA
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Visseaux J SA
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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
    • H01J29/768—Deflecting by magnetic fields only using printed windings

Definitions

  • the presentinvention relates to an improved method and means for designing an electromagnetic deflecting means for deflecting the cathode ray beam of any cathode ray apparatus intended for such purposes as oscilloscopic, oscillographic, picture analysing or reproducing purposes or the like.
  • One object of the invention is to, provide an electromagnetic deflecting means of high elficiency with respect to the electrical power supplied thereto for its normal operation.
  • Another object of the invention is to provide an electromagnetic deflecting means of fairly good deflection properties in that it substantially eliminates such deleterious effects as are apparent in conventional designs as a result of the presence of spurious magnetic fields at both ends of a conventional electromagnetic deflecting means.
  • Another object of the invention is to provide such an improved electromagnetic deflecting means of high efliciency and good deflection properties that it can be manufactured through a simple and economical method of manufacturing.
  • each turn of wire when the coil is developed in a flat form, is of a substantially rectangular configuration; when the coil is shaped for application upon the neck of a cathode ray tube, each turn of wire substantially constitutes a convex quadrilateral.
  • the sides which are parallel to the axis on the neck actually serve for deflection control of the electron beam concerned.
  • Those wire sides which are arcuately bent merely waste part of the power supplied to the coil.
  • the magnetic field generated from said arcuate sides has a deleterious action in that it distorts the useful longitudinal magnetic field and thus causes a variation in the structure of the controlled electron beam at both entrance and exit of the deflecting coil.
  • an electromagnetic deflecting means wherein each turn of wire when assembled presents a quadrangle having one pair of conductor sides parallel to the generatrices of the deflection space; the other pair of conductor sides being connected to diametrically opposed ends of the first two sides, and when developedin a plane, substantially presents the configuration of a concave quadrilateral having two parallel sides and two diagonal sides, viz. the configuration of a concave oblique parallelogram; after such a winding has been shaped for application upon the neck of a cathode ray tube, two parallel sides of any turn of wire will have their normal efficiency and two.
  • diagonal sides will generate respective magnetic fields resulting when'vectorially combined in a field vector parallel to the longitudinal direction of the field vectors of the two parallel sides thereby eliminating the drawbacks of a conventional electromagnetic deflection means.
  • a method of manufacturing such an improved electromag- "ice netic deflection means involves the steps of making a flat coil grammatical turns having a diagonal which also represents its height, electrically insulating the flat coil and folding the insulated coil along the diagonal height whereby the two parts of the coil on either side of the diagonal height are superimposed in space the flat form of an electromagnetic deflection winding according to the invention, such form may then be suitably bent at will around the neck or part of the neck of a cathode ray tube so as to represent at least one deflection winding therefor.
  • Fig. 1 represents a conventional electromagnetic deflection means reduced in the interest of clarity, to a single turn of wire each one of the two cooperating windings or coils which together constitute such a deflection means;
  • Fig. 2 shows the flat developed form of one of these turns of wire
  • Fig. 3 represents an electromagnetic deflection means according to the invention also reducing to a single turn of wire each of its two cooperating windings;
  • Fig. 3A diagrammatically indicates the field distribution in a cross-section of a deflection means according to Fig. 3;
  • Fig. 4. shows the flat developed form of one of these turns of wire
  • Figs. 5, 6 and 7 illustrate different views in the manufacture of a deflection means according to the invention.
  • Fig. 8 illustrates the manner whereby in accordance with one feature of the invention a complete electromagnetic deflection means, including two pairs of field Windings for horizontal and vertical deflections of an electron beam, may be obtained from a single manufacturing process.
  • Fig. 1 shows two. turns of wire ABCD and A B C D on either side of a neck 1 of a cathode ray tube. Each turn is obtained by bending in the suitable arcuate shape a flat rectangular turn such as shown in Fig. 2 at ABCD.
  • Sides AB and A 13 constitute one dipole element of a pair of dipoles; the other dipole pair is constituted by the opposite sides CD and G l) of the turns of wire.
  • Each. corresponding pair of turns of wire in an electromagnetic deflection means will similarly define a pair of dipole elements, which are substantially diametrically opposed with respect to neck 1 and which constitute the active portions of the turns, creating an overall deflection magnetic field within this neck the rest direction of which is substantially parallel to the longitudinal axis of this neck.
  • the useful length AB-I-CD represents too small a portion of overall winding length to enable the complete deflection means to operate with high efi'iciency.
  • the deflection angle for a cathode ray tube which previously was about 55, frequently reaches now an angle of 70 and even, in certain kinds of cathode ray tubes, is extended to as high as 90.
  • the length L of a portion of turn such as AB, or CD may be represented as a function of radius R and half-angle of deflection 6, in the following manner:
  • FIG. 3 shows in such a case, the basic arrangement of a pair of deflection coils upon the neck of a cathode ray tube.
  • Fig. 3A illustrates the shape of the magnetic field obtained with such an arrangement, within the neck of the cathode ray tube.
  • the lateral extension a deflection means can at most be equal to 90.
  • the direction of the flow of current and CD is the same, and the direction of the flow of the deflecting current through the conductors A B and OD also is the same, but these directions are opposite with respect to each other, and consequently so are the signs of the magnetic fields from the horizontal branches of the first and the second wind ings of the deflection means.
  • the magnetic field which is created at the intersection of diagonal sides AD and CB of the first coil is the vectorial sum of the magnetic fields due to the flow of deflecting current through these portions of wire. So is the magnetic field created at the intersection of the diagonal sides A D and GB of the second coil.
  • These magnetic fields and their resulting field vector obviously have such a direction that the main component thereof is directed along the axis of the structure in the very direction of the magnetic field created by the above-defined dipole elements. Consequently in an electromagnetic deflection means according to the invention, the part of the power which is taken by the diagonal sides is at least partly recuperated for a useful purpose and the overall efliciency is increased.
  • This spiral parallelogrammatic coil is electrically insulated and then folded along diagonal 3, as shown in Fig. 6. Each one of its turns assumes the configuration shown in Fig. 4. Folding takes place in the flat developed state of the product. After folding, the deflection means may be shaped or arcuated as required for application upon the neck of a cathode ray tube. If necessary, several such products may be superimposed in a pile before being folded and serially connected, or alternatively serially interconnected after individual folding steps. In such a process of manufacture, any number of turns, or any thickness of winding may easily be obtained.
  • Figs. 5 and 6 show an insulating support 4 which may be either temporary or preserved throughout the manufacture, especially when, according to a preferred embodiment, the manufacture includes the necessary steps for printing the spiral coils.
  • a thermoplastic glue such as a polymerisablerosin, such as known under the trademark Araldite, may be used for holding sheets 5 and 6 together.
  • the thickness of either sheet or foil may be of the order of three to five hundredths of a millimeter.
  • the face of the metallic foil is cleaned and then coated with a film of a material which, after drying, will be photosensitive and could act as a. photographic layer upon which will be projected a picture of the drawing of the spiral coil. 7
  • the windings I and III will be serially connected over terminals I and III' and similarly the windings II and IV over terminals II and V respectively.
  • the mere application of the printed sheet over 360 around the neck of a cathode ray tube will provide the two-directional electromagnetic deflection means for this tube.
  • any manufacturing process other than printing may be used for putting the invention into practice and to this end any conventional techniques utilising separate insulated wires wound upon parallelogrammatic flat blanks may be used without departing from the scope of this disclosure in this respect.
  • each of said coils comprising at least one conductor winding having the general configuration of a quadrangle; one pair of conductor sides being parallel to the generatrices of said deflection space and the other pair of conductor sides connecting diametrically opposed ends of the first two sides; and means for insulating one of the parallel sides and the diainetrical side connected thereto from the other parallel side and the diametrical side connected with said other parallel side and means for insulating said conductor portions.
  • each coil comprises a plurality of quadrangmlar conductor windings connected in series, and having a common diagonal forming the height of said coil; there being provided one sheeted structure supporting one element of each of said conductor pairs and another sheeted structure superimposed upon said first sheeted structure and supporting the other element of each conductor pair; said conductor windings extending from said first sheeted structure over a separation line formed along said common diagonal into said second sheeted structure superimposed upon said first sheeted structure.
  • first and second sheeted structures are formed as a unitary structure attached to each other along said common diagonal.
  • insulating means include insulating sheeting supporting said conductor portions in the form of flat conducting strips.
  • each coil having the general shape of quadrangles with two conductor sides being straight and extending parallel to said deflection space, and two other conductor sides being arcuate and connecting diametrically opposite ends of the first two sides; one of said straight sides and the arcuate side condeflection structure, at least 6 nected thereto being insulated from the other straight side and the arcuate side connected to that other straight side, and means for connecting said coils in series.
  • each coil is arcuated along a portion of a cylindrical surface covering not more than degrees transversely to the direction of said deflection space.
  • each of said spiral coils extends over two superimposed sheets forming said sheeted configuration attached to each other along one of the diagonals of said quadrangles.
  • each of said spiral coils extends over two superimposed sheets forming said sheeted configuration and attached to each other along one of the diagonals of said quadrangle, said diagonal forming the height of said coils and being arranged in a common plane substantially perpendicular to said deflection space.

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US440154A 1953-07-10 1954-06-29 Electromagnetic deflection means Expired - Lifetime US2831135A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR959480X 1953-07-10

Publications (1)

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US2831135A true US2831135A (en) 1958-04-15

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US440154A Expired - Lifetime US2831135A (en) 1953-07-10 1954-06-29 Electromagnetic deflection means

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US (1) US2831135A (US20030199744A1-20031023-C00003.png)
BE (1) BE529658A (US20030199744A1-20031023-C00003.png)
DE (1) DE959480C (US20030199744A1-20031023-C00003.png)
FR (1) FR1086373A (US20030199744A1-20031023-C00003.png)
GB (1) GB771066A (US20030199744A1-20031023-C00003.png)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3007087A (en) * 1958-06-04 1961-10-31 Gen Dynamics Corp Electromagnetic deflection coil
US3118092A (en) * 1956-01-11 1964-01-14 Hazeltine Research Inc Magnetic deflection coils and yokes
US3139566A (en) * 1955-08-25 1964-06-30 Hazeltine Research Inc Construction of magnetic deflection yokes and the like
US3387242A (en) * 1966-06-22 1968-06-04 Stromberg Carlson Corp Electromagnetic deflection winding configuration
US4310821A (en) * 1978-09-08 1982-01-12 Frances Andre L Spiralled printed inductance

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2925527A (en) * 1956-12-24 1960-02-16 Hazeltine Research Inc Magnetic deflection system
US2986668A (en) * 1957-12-23 1961-05-30 Gen Dynamics Corp Cathode ray tube optical system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647474A (en) * 1923-10-25 1927-11-01 Frederick W Seymour Variable pathway
US2167379A (en) * 1936-02-28 1939-07-25 Rca Corp Cathode ray tube deflecting device
US2269678A (en) * 1939-06-02 1942-01-13 Jefferson Electric Co Method of manufacturing coil structures
US2278478A (en) * 1941-01-10 1942-04-07 Bell Telephone Labor Inc Magnetic coil and arrangement utilizing the same
US2400008A (en) * 1943-07-14 1946-05-07 Carter Carburetor Corp Method of forming coils
US2645735A (en) * 1952-04-19 1953-07-14 Rca Corp Precision deflecting yoke
US2722621A (en) * 1949-10-04 1955-11-01 Hartford Nat Bank & Trust Co Device for deflecting the cathode-ray in cathode-ray tubes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647474A (en) * 1923-10-25 1927-11-01 Frederick W Seymour Variable pathway
US2167379A (en) * 1936-02-28 1939-07-25 Rca Corp Cathode ray tube deflecting device
US2269678A (en) * 1939-06-02 1942-01-13 Jefferson Electric Co Method of manufacturing coil structures
US2278478A (en) * 1941-01-10 1942-04-07 Bell Telephone Labor Inc Magnetic coil and arrangement utilizing the same
US2400008A (en) * 1943-07-14 1946-05-07 Carter Carburetor Corp Method of forming coils
US2722621A (en) * 1949-10-04 1955-11-01 Hartford Nat Bank & Trust Co Device for deflecting the cathode-ray in cathode-ray tubes
US2645735A (en) * 1952-04-19 1953-07-14 Rca Corp Precision deflecting yoke

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139566A (en) * 1955-08-25 1964-06-30 Hazeltine Research Inc Construction of magnetic deflection yokes and the like
US3118092A (en) * 1956-01-11 1964-01-14 Hazeltine Research Inc Magnetic deflection coils and yokes
US3007087A (en) * 1958-06-04 1961-10-31 Gen Dynamics Corp Electromagnetic deflection coil
US3387242A (en) * 1966-06-22 1968-06-04 Stromberg Carlson Corp Electromagnetic deflection winding configuration
US4310821A (en) * 1978-09-08 1982-01-12 Frances Andre L Spiralled printed inductance

Also Published As

Publication number Publication date
GB771066A (en) 1957-03-27
FR1086373A (fr) 1955-02-11
BE529658A (US20030199744A1-20031023-C00003.png)
DE959480C (de) 1957-03-07

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