EP0635163B1 - Device for the deflexion of electron beams for cathode ray tubes, which is self-convergent and geometry corrected - Google Patents

Device for the deflexion of electron beams for cathode ray tubes, which is self-convergent and geometry corrected Download PDF

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Publication number
EP0635163B1
EP0635163B1 EP93907920A EP93907920A EP0635163B1 EP 0635163 B1 EP0635163 B1 EP 0635163B1 EP 93907920 A EP93907920 A EP 93907920A EP 93907920 A EP93907920 A EP 93907920A EP 0635163 B1 EP0635163 B1 EP 0635163B1
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Prior art keywords
deflection
winding
coil
conductors
deflection device
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EP93907920A
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German (de)
French (fr)
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EP0635163A1 (en
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Bruno Roussel
Alain Dumesnil
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Thomson Tubes and Displays SA
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Thomson Tubes and Displays 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
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • 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 a device for deflection of electron beams from a barrel three-beam electrons in a line from a ray tube cathodic including a screen slab substantially plane.
  • the device of deflection also called deflector has the function of deflect the beams to make them explore the whole the screen surface of the tube to generate the images and to ensure the convergence of these beams during all the exploration.
  • the volume swept by the beams of electrons is a pyramid whose apex is confused with the deflection center of the deflection device and whose intersection with a large screen surface radius of curvature determines a figure with a defect in geometry called cushion. This distortion the geometric of the image is all the stronger as the radius of curvature of the tube screen is important.
  • the so-called self-converging deviators generate fields magnetic astigmatic lines and wefts to ensure the convergence of electronic beams up to perforations in the mask for selecting colors, placed at a very short distance from the screen of the tube.
  • the lines of force of the magnetic fields created must then be in cushion for the line field and in barrel for the frame field.
  • Patent US 5077533 discloses that corrections of geometry of the image can be brought by an auxiliary winding so as to add to the deflection field generated by the main winding of 3, 5 or higher harmonic components. However, it is not indicated how to avoid that by increasing the value of harmonic 3 we can avoid introducing an increase in responsible harmonic 5 deconvergence of the beams in the corners of the screen.
  • the object of the present invention is to minimize the deformation of NORTH / SOUTH geometry generated by a substantially flat screen while preserving the convergence of electron beams.
  • the rear zone closest to the electron gun, especially influences coma or difference in green image size compared to blue images and red
  • the middle area of the diverter acts more particularly on astigmatism or the convergence of red and blue electron beams
  • the area front located closest to the tube screen acts on the geometry of the image that will form on the screen.
  • Figure 1 shows the action of the main lines of the horizontal deflection magnetic fields 1, depending on the direction of the X and vertical axis 2, along the disrection of the Y axis, on the geometry of the image.
  • Sure the figure are represented in A the electron beam corresponding to the upper right corner of the image and 3 and 4 the electron beams corresponding to the edges of the image.
  • the distribution of the turns must be of the line coil be such that the decomposition into Fourier series of the angular distribution of the ampere-turns density in the coil a significant percentage of harmonic 3 compared to to the fundamental.
  • French patent FR2411486 describes a coil, shown in Figure 2, in which we reverse the direction of current in part 20 (dotted on the figure) of the winding 21.
  • This structure allows increase the share of harmonic 3 but also causes over-convergence of electron beams if this part is very important as it is when it comes to to correct the geometry of a screen with a large radius curvature; in addition, the turns 20 decrease the L / R ratio between the value of the inductance of the coil 21 and its resistance which increases the power supplied required to scan the screen.
  • Figure 4 is a sectional view along a plane perpendicular to the main Z axis of the part tube front of a saddle coil according to the invention. Given the symmetry along the Y axis, only the section of a half reel is shown.
  • This half reel includes a first part constituting a coil main 21, whose conductors 23 are supplied with so that the current flowing through it flows in a certain direction 30 and a second part 22, constituting an auxiliary coil located at the front of the diverter, supplied so that the current, within conductors 24 flows there in a direction 31, opposite to previous.
  • the conductors 24 are arranged in such a way that they occupy an angular opening ( ⁇ 1 ⁇ ⁇ 2 ) and are distributed around an average angle ⁇ M , on either side of which there is a substantially equal number of conductors 24 .
  • N ( ⁇ ) A1.COS ( ⁇ ) + A3. COS (3 ⁇ ) + A5.COS (5 ⁇ ) + ... + AK.COS (K ⁇ ) + ... with
  • R is the radius of the ferrite magnetic circuit which covers the deflection coils in order to concentrate the fields to improve the energy efficiency of the deflection device and
  • A1 / R represents the fundamental field, (A3 / R 3 ).
  • (X 2 -Y 2 ) the harmonic 2 of the field, (A5 / R 5 ).
  • a positive A3 term corresponds to a harmonic 2 of positive field strength and induces field strength lines cushion.
  • Figure 5 represents according to ⁇ , the terms COS ( ⁇ ), COS (3 ⁇ ), COS (5 ⁇ ) ... for ⁇ understood between 0 ° and 90 °.
  • the conductors constituting it will preferably be arranged between 0 ° and 20 ' values for which COS (3 ⁇ ) remains greater than 0.5.
  • the angular position of the coil conductors main introduces a percentage important harmonic 5 of ampere-turns density that it is possible to compensate by the same winding auxiliary by placing the conductors 24 in an area where N ( ⁇ ) .COS (5 ⁇ ) is negative (in order to avoid harmonic 5 introduced by the main coil) this which, for N ( ⁇ ) negative can be achieved by arranging the majority of conductors 24 in an angular position between 54 ° and 90 °.
  • the average angular position ⁇ M increases as and as we move away from the screen.
  • This coil structure also makes it possible to limit to acceptable values the decrease in the L / R ratio of the horizontal deflection coil because in this case the conductors 24 occupy a smaller area than conductors 20 of the state of the art.
  • the auxiliary winding is arranged in the front third of the main winding.
  • the coil 21 extends in Z over a length of approximately 90mm and has 32 turns while the coil 22 extends along Z over a length of 20mm and has 14 turns.
  • the two windings are arranged in series, so that the current in the auxiliary winding flows in the opposite direction to the current in the main winding.
  • the arrangement in series of the two windings is not limiting, the winding 22 being able to be obviously supplied by a second external source.
  • the conductors 24 are arranged around an angular position ⁇ M of between 58 ° and 71 °, increasing as one moves away from the part of the winding closest to the screen of the tube, the conductors 24 being wound between 54 ° and 80 °.
  • the deflection device being divided into three zones, the front zone 47, closest to the screen of the tube, the central zone 46 and the rear zone 45, FIGS. 6, 7, 8 show, along the axis Z, the modifications of the amplitude of the deflector line field 43 introduced by the auxiliary coil positioned at 44 in the front part 47 of the main winding, that is to say as close as possible to the screen of the tube.
  • the amplitude of the harmonic 3 is roughly doubled, from 51 without the coil 22 to 41 after addition of this coil; thus the amplitude obtained 41 of the harmonic 3 is found to be greater than that of the fundamental 40 by about 12%.
  • the amplitude of the harmonic 5 is reduced from 52 to 42, thereby improving the convergence of the beams in the corners of the screen.
  • some of the conductors 23 of the main winding 21 located in the middle part 46 of the diverter are shifted towards inside the coil 21 over a length 48.
  • the Figures 9.1 and 9.2 illustrate this embodiment in showing a line coil in which all of conductors are shifted towards the inside of the coil. In a section along a plane perpendicular to Z passing through zone 48, this offset is represented by the angle a.
  • This offset makes it possible to decrease locally, in zone 46, the importance of harmonic 3 of the angular distribution of ampere-turns density in the winding, an excessive value of which could lead to a deconvergence of electron beams, but that it it is necessary to have in zone 47 to be able to obtain effective correction of cushion deformation.
  • the conductors of the coil 21 of the deflector equipping this tube are offset by an angle equal to about 10 ° in the middle zone 46.
  • the coil 22 creating a magnetic field from oppose that of the main coil 21 is made up of main coil conductors, wound up in such a way that they open a window 35 in the crown 36 of the main winding, window extending inwardly of the coil 21; thereby current flows in opposite directions 30 and 31 in both winding parts 21 and 22.
  • Another way of implementing the principle of the invention is to use an auxiliary coil 22 whose conductors are short-circuited on themselves.
  • the magnetic field created by the main coil 21 induces in the auxiliary coil a current which tends to oppose the variation in flux seen from this coil 22. It therefore appears in the strands of the coil 22 a current of opposite direction to that circulating in the coil 21.
  • This embodiment allows a greater correction of the NORTH / SOUTH geometry than in the case where the coils 21 and 22 are in series because the induced current reaches a value greater than that of the circulating current in the main coil.
  • this type of embodiment makes it possible to simplify the wiring of the coils 21 and 22 and avoids running wires subjected to high voltages such as the return voltage of the horizontal scan.
  • the apparent L / R ratio is improved, the short-circuited turns no longer being taken into account in the resistance of the deflector.

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)

Description

La présente invention se rapporte à un dispositif de déflexion des faisceaux d'électrons issus d'un canon à électrons à trois faisceaux en ligne d'un tube à rayons cathodiques comportant une dalle écran sensiblement plane.The present invention relates to a device for deflection of electron beams from a barrel three-beam electrons in a line from a ray tube cathodic including a screen slab substantially plane.

Dans les tubes à rayons cathodiques utilisant un canon à électrons à trois faisceaux coplanaires correspondant aux trois couleurs primaires Rouge, Vert, Bleu, le dispositif de déflexion, encore appelé déviateur a pour fonction de dévier les faisceaux de façon à leur faire explorer toute la surface de l'écran du tube pour y générer les images et à assurer la convergence de ces faisceaux pendant toute l'exploration.In cathode ray tubes using a barrel electrons with three coplanar beams corresponding to three primary colors Red, Green, Blue, the device of deflection, also called deflector has the function of deflect the beams to make them explore the whole the screen surface of the tube to generate the images and to ensure the convergence of these beams during all the exploration.

Sous l'action des champs de déflexion horizontaux et verticaux uniformes, le volume balayé par les faisceaux d'électrons est une pyramide dont le sommet est confondu avec le centre de déflexion du dispositif de déflexion et dont l'intersection avec une surface écran d'important rayon de courbure détermine une figure présentant un défaut de géométrie appellé coussin. Cette déformation géométrique de l'image est d'autant plus forte que le rayon de courbure de l'écran du tube est important.Under the action of the horizontal deflection fields and uniform verticals, the volume swept by the beams of electrons is a pyramid whose apex is confused with the deflection center of the deflection device and whose intersection with a large screen surface radius of curvature determines a figure with a defect in geometry called cushion. This distortion the geometric of the image is all the stronger as the radius of curvature of the tube screen is important.

Les déviateurs dits autoconvergents engendrent des champs magnétiques lignes et trames astigmates afin d'assurer la convergence des faisceaux électroniques à hauteur des perforations pratiquées dans le masque de sélection des couleurs, disposé à trés faible distance de l'écran du tube. Les lignes de force des champs magnétiques créés doivent être alors en coussin pour le champ ligne et en tonneau pour le champ trame.The so-called self-converging deviators generate fields magnetic astigmatic lines and wefts to ensure the convergence of electronic beams up to perforations in the mask for selecting colors, placed at a very short distance from the screen of the tube. The lines of force of the magnetic fields created must then be in cushion for the line field and in barrel for the frame field.

Ces champs magnétiques modifient la géométrie NORD/SUD et EST/OUEST de l'image en exerçant en particulier, une compensation de la déformation NORD/SUD en coussin due à la planéité de l'écran.These magnetic fields modify the NORTH / SOUTH geometry and EAST / WEST of the image by exercising in particular, compensation for the NORTH / SOUTH cushion deformation due to the flatness of the screen.

Il est connu, pour corriger les déformations résiduelles de la géométrie, d'utiliser des pièces métalliques s'étendant à l'avant du dispositif de déflexion comme dans le brevet Toshiba US4257023, ou une série d'aimants orientés disposés sur le dispositif de déflexion ou à proximité de celui-ci, comme décrit dans la demande de brevet Videocolor F8702370, ou d'inverser le sens de circulation du courant dans une partie du bobinage ligne comme dans le brevet FR2411486. Cependant, aucun de ces dispositifs ne permet de contrôler la géométrie NORD/SUD de l'image sur toute la surface d'un écran sensiblement plan en préservant la convergence des faisceaux sur toute sa surface.It is known, to correct the residual deformations of the geometry, to use metal parts extending in front of the device deflection as in the Toshiba patent US4257023, or a series oriented magnets arranged on or near the deflection device of it, as described in the Videocolor patent application F8702370, or reverse the direction of current flow in a part of the line winding as in patent FR2411486. However, none of these devices can control the NORTH / SOUTH geometry of the image over the entire surface of a substantially flat screen in preserving the convergence of the beams over its entire surface.

Le brevet US5077533 divulgue que des corrections de géométrie de l'image peuvent être amenées par un bobinage auxiliaire de manière à ajouter au champ de déflexion généré par le bobinage principal des composantes d'harmoniques 3, 5 ou supérieures. Cependant, il n'est pas indiqué comment éviter qu'en augmentant la valeur de l'harmonique 3 on peut éviter d'introduire une augmentation de l'harmonique 5 responsable de la déconvergence des faisceaux dans les coins de l'écran.Patent US 5077533 discloses that corrections of geometry of the image can be brought by an auxiliary winding so as to add to the deflection field generated by the main winding of 3, 5 or higher harmonic components. However, it is not indicated how to avoid that by increasing the value of harmonic 3 we can avoid introducing an increase in responsible harmonic 5 deconvergence of the beams in the corners of the screen.

Le but de la présente invention est de minimiser la déformation de géométrie NORD/SUD engendrée par un écran sensiblement plat tout en préservant la convergence des faisceaux d'électrons.The object of the present invention is to minimize the deformation of NORTH / SOUTH geometry generated by a substantially flat screen while preserving the convergence of electron beams.

Ce but est atteint par un dispositif de déflexion selon la revendication 1 et un tube à rayons cathodiques equipé d'un tel dispositif selon la revendication 7. This object is achieved by a deflection device according to claim 1 and a cathode ray tube fitted with a such device according to claim 7.

L'invention sera mieux comprise à l'aide des figures ci-après parmi lesquelles :

  • La figure 1 montre une coupe, suivant un plan perpendiculaire à l'axe longitudinal Z du tube située à l'avant du déviateur, coté écran, du volume pyramidal de déflexion ; y sont représentés les champs magnétiques horizontal et vertical ainsi que les forces s'exerçant sur les électrons qui formeront le coin supérieur droit de l'image.
  • La figure 2 est une vue en perspective d'une bobine ligne en forme de selle d'un dispositif de déflexion connu .
  • La figure 3 est une vue en perspective d'une bobine ligne en forme de selle conforme à la présente invention.
  • La figure 4 est une vue en coupe suivant un plan perpendiculaire à l'axe principal Z du tube, de la partie avant d'une bobine en selle conforme à la présente invention.
  • La figure 5 illustre la variation angulaire entre 0° et 90° des fonctions cos e, cos 3e, cos 5e..., de la fonction de distribution de la densité d'ampère-tours dans une bobine de déflexion .
  • La figure 6 représente les résultats des mesures d'amplitude de champs magnétiques le long de l'axe Z créés par une bobine ligne conforme à la présente invention.
  • La figure 7 montre l'influence sur l'harmonique 2 du champ magnétique d'une structure de bobine conforme à l'invention.
  • La figure 8 montre l'influence sur l'harmonique 4 du champ magnétique d'une structure de bobine conforme à la présente invention.
  • Les figures 9 et 10 illustrent des variantes de la présente invention.
The invention will be better understood with the aid of the figures below, among which:
  • Figure 1 shows a section along a plane perpendicular to the longitudinal axis Z of the tube located in front of the deflector, screen side, of the pyramidal volume of deflection; There are represented the horizontal and vertical magnetic fields as well as the forces exerted on the electrons which will form the upper right corner of the image.
  • Figure 2 is a perspective view of a saddle-shaped line coil of a known deflection device.
  • Figure 3 is a perspective view of a saddle-shaped line coil according to the present invention.
  • Figure 4 is a sectional view along a plane perpendicular to the main axis Z of the tube, of the front part of a saddle coil according to the present invention.
  • FIG. 5 illustrates the angular variation between 0 ° and 90 ° of the functions cos e, cos 3e, cos 5e ..., of the function of distribution of the density of ampere-turns in a deflection coil.
  • FIG. 6 represents the results of the amplitude measurements of magnetic fields along the Z axis created by a line coil according to the present invention.
  • FIG. 7 shows the influence on harmonic 2 of the magnetic field of a coil structure according to the invention.
  • FIG. 8 shows the influence on harmonic 4 of the magnetic field of a coil structure according to the present invention.
  • Figures 9 and 10 illustrate variants of the present invention.

Il est d'usage de diviser le système de déviation en trois zones d'action successives le long de l'axe Z ; la zone arrière, la plus proche du canon à électrons, influence plus particulièrement la coma ou différence de taille de l'image verte par rapport aux images bleu et rouge; la zone milieu du déviateur agit plus particulièrement sur l'astigmatisme ou la convergence des faisceaux d'électrons rouge et bleu ; enfin la zone avant, située la plus prés de l'écran du tube agit sur la géométrie de l'image qui va se former sur l'écran.It is customary to divide the deviation system into three successive action zones along the Z axis; the rear zone, closest to the electron gun, especially influences coma or difference in green image size compared to blue images and red; the middle area of the diverter acts more particularly on astigmatism or the convergence of red and blue electron beams; finally the area front, located closest to the tube screen acts on the geometry of the image that will form on the screen.

La figure 1 montre l'action des lignes de force des champs magnétiques de déflexion horizontal 1, suivant la direction de l'axe X et vertival 2 , suivant la disrection de l'axe Y, sur la géométrie de l'image. Sur la figure sont représentés en A le faisceau d'électrons correspondant au coin supérieur droit de l'image et en 3 et 4 les faisceaux d'électrons correspondants aux bords de l'image. En décomposant les champs magnétiques et les forces qu'ils créent sur les faisceaux d'électrons, on remarque que ces forces (FVy et FHx), issues des formes en coussin du champ ligne et en tonneau du champ trame, ont tendance à tirer sur le point A de manière à corriger la déformation de coussin horizontale (NORD/SUD) et à amplifier la déformation de coussin vertical.Figure 1 shows the action of the main lines of the horizontal deflection magnetic fields 1, depending on the direction of the X and vertical axis 2, along the disrection of the Y axis, on the geometry of the image. Sure the figure are represented in A the electron beam corresponding to the upper right corner of the image and 3 and 4 the electron beams corresponding to the edges of the image. By breaking down the magnetic fields and forces they create on electron beams, we note that these forces (FVy and FHx), resulting from the forms in cushion of the line field and in barrel of the field field, tend to shoot point A so as to correct the horizontal cushion deformation (NORTH / SOUTH) and at amplify the vertical cushion deformation.

Pour que le champ de déflexion ligne ait une répartition en forme de coussin il faut que la répartition des spires de la bobine ligne soit telle que la décomposition en série de Fourier de la distribution angulaire de la densité d'ampère-tours dans la bobine fasse apparaitre un pourcentage d'harmonique 3 non négligeable par rapport au fondamental.So that the line deflection field has a distribution in the form of a cushion, the distribution of the turns must be of the line coil be such that the decomposition into Fourier series of the angular distribution of the ampere-turns density in the coil a significant percentage of harmonic 3 compared to to the fundamental.

Il est connu que pour augmenter le pourcentage d'harmonique 3, les conducteurs de fil de la bobine 21, visibles sur la figure 2, s'étendant dans la direction de l'axe principal Z doivent être tassés le plus prés possible du plan XZ. Comme le montrent la figure 2 représentant une bobine ligne 21 en forme de selle vue en perspective et la figure 4 représentant une bobine de ce type vue en coupe dans un plan perpendiculaire à l'axe Z, les conducteurs latéraux 23 de la bobine 21 répondant au critère recherché sont contenus dans une ouverture angulaire ⊘l la plus faible possible. S'il est possible de réaliser la convergence des faisceaux par une telle répartition, corriger la géométrie NORD/SUD pour un tube possédant un écran de faible courbure, voire totalement plan est alors impossible, des limitations physiques dues à l'encombrement des fils ne permettent pas d'atteindre les valeurs de ⊘l désirées pour obtenir un taux d'harmonique 3 convenable. En particulier , il est impossible d'obtenir un coefficient d'harmonique 3 proche ou supérieur à celui du fondamental. De plus, il est connu que cette structure de bobine introduit un pourcentage important d'harmonique 5, responsable de la déconvergence des faisceaux d'électrons dans les coins de l'écran.It is known that to increase the percentage of harmonic 3, the wire conductors of the coil 21, visible in Figure 2, extending in the direction of the main axis Z must be packed as close as possible possible from the XZ plane. As shown in Figure 2 representing a saddle-shaped line 21 coil viewed at perspective and figure 4 showing a coil of this type sectional view in a plane perpendicular to the axis Z, the lateral conductors 23 of the coil 21 responding to the criteria sought are contained in an opening angular ⊘l as small as possible. If it's possible to achieve the convergence of the beams by such distribution, correct NORTH / SOUTH geometry for a tube with a screen of weak curvature, even completely plan is then impossible, physical limitations due the size of the wires does not allow reaching the values of ⊘l desired to obtain a rate of harmonic 3 suitable. In particular, it is impossible to obtain a close harmonic coefficient 3 or higher than that of the fundamental. In addition, it is known that this coil structure introduces a large percentage of harmonic 5, responsible for deconvergence of electron beams in the corners of the screen.

Le brevet français FR2411486 décrit une bobine, représentée à la figure 2, dans laquelle on inverse le sens du courant dans une partie 20 (en pointillé sur la figure) du bobinage 21. Cette structure permet d'augmenter la part d'harmonique 3 mais provoque aussi la surconvergence des faisceaux d'électrons si cette part est trés importante comme c'est le cas lorsqu'il s'agit de corriger la géométrie d'un écran de fort rayon de courbure; de plus, les spires 20 diminuent le rapport L/R entre la valeur de l'inductance de la bobine 21 et sa résistance ce qui a pour conséquence d'augmenter la puissance fournie nécessaire au balayage de l'écran.French patent FR2411486 describes a coil, shown in Figure 2, in which we reverse the direction of current in part 20 (dotted on the figure) of the winding 21. This structure allows increase the share of harmonic 3 but also causes over-convergence of electron beams if this part is very important as it is when it comes to to correct the geometry of a screen with a large radius curvature; in addition, the turns 20 decrease the L / R ratio between the value of the inductance of the coil 21 and its resistance which increases the power supplied required to scan the screen.

Le dispositif de la figure 3 décrit un mode de réalisation de la présente invention; la bobine de déflexion ligne est constituée d'un bobinage en deux parties :

  • un bobinage de déflexion principal s'étendant sur la longueur du déviateur suivant l'axe Z et dont les conducteurs latéraux sont tassés le plus prés possible du plan XZ
  • un bobinage de déflexion auxiliaire disposé dans la partie avant de la bobine principale et alimenté de façon à engendrer un champ de sens opposé au sens du champ créé par le bobinage principal.
The device of Figure 3 describes an embodiment of the present invention; the line deflection coil consists of a coil in two parts:
  • a main deflection coil extending over the length of the deflector along the Z axis and whose lateral conductors are packed as close as possible to the XZ plane
  • an auxiliary deflection coil disposed in the front part of the main coil and supplied so as to generate a field of direction opposite to the direction of the field created by the main coil.

La figure 4 est une vue en coupe suivant un plan perpendiculaire à l'axe Z principal du tube de la partie avant d'une bobine en selle conforme à l'invention. Compte tenu de la symétrie suivant l'axe Y seule la coupe d'une demie-bobine est représentée. Cette demie-bobine comprend une première partie constituant une bobine principale 21, dont les conducteurs 23 sont alimentés de façon à ce que le courant qui la traverse circule dans un certain sens 30 et une deuxième partie 22,constituant une bobine auxilaire située à l'avant du déviateur, alimentée de façon à ce que le courant, dans les conducteurs 24 y circule dans un sens 31, inverse au précédent.Figure 4 is a sectional view along a plane perpendicular to the main Z axis of the part tube front of a saddle coil according to the invention. Given the symmetry along the Y axis, only the section of a half reel is shown. This half reel includes a first part constituting a coil main 21, whose conductors 23 are supplied with so that the current flowing through it flows in a certain direction 30 and a second part 22, constituting an auxiliary coil located at the front of the diverter, supplied so that the current, within conductors 24 flows there in a direction 31, opposite to previous.

Les conducteurs 24 sont disposés de telle façon qu'ils occupent une ouverture angulaire (1 · 2) et sont distribués autour d'un angle moyen M, de part et d'autre duquel se trouve un nombre de conducteurs 24 sensiblement égal.The conductors 24 are arranged in such a way that they occupy an angular opening ( 1 ·  2 ) and are distributed around an average angle  M , on either side of which there is a substantially equal number of conductors 24 .

On comprendra mieux le principe de l'invention en écrivant les équations qui régissent la déflexion magnétique. Du fait des symétries des enroulements du déviateur, la décomposition en série de Fourier de la densité d'ampère-tours N() d'une bobine s'écrit : N() = A1.COS()+A3. COS (3)+A5.COS (5) +...+AK.COS (K) + ... avec

Figure 00070001
The principle of the invention will be better understood by writing the equations which govern the magnetic deflection. Due to the symmetries of the deflector windings, the Fourier series decomposition of the ampere-turns density N () of a coil is written: N () = A1.COS () + A3. COS (3) + A5.COS (5) + ... + AK.COS (K) + ... with
Figure 00070001

Le champ magnétique créé prend l'expression: H=A1/R +(A3/R3) . (X2 -Y2) +(A5/R5) . (X4 -6.X2.Y2+Y4) + ... où R est le rayon du circuit magnétique en ferrite qui recouvre les bobines de déviation afin de concentrer les champs pour améliorer le rendement en énergie du dispositif de déviation et A1/R représente le champ fondamental, (A3/R3).(X2 -Y2) l'harmonique 2 du champ, (A5/R5) .(X4 -6.X2.Y2+Y4) l'harmonique 4 de ce champ etc... The magnetic field created takes the expression: H = A1 / R + (A3 / R 3 ). (X 2 -Y 2 ) + (A5 / R 5 ). (X 4 -6.X 2 .Y 2 + Y 4 ) + ... where R is the radius of the ferrite magnetic circuit which covers the deflection coils in order to concentrate the fields to improve the energy efficiency of the deflection device and A1 / R represents the fundamental field, (A3 / R 3 ). (X 2 -Y 2 ) the harmonic 2 of the field, (A5 / R 5 ). (X 4 -6.X 2 .Y 2 + Y 4 ) the harmonic 4 of this field etc ...

Ainsi, un terme A3 positif correspond à un harmonique 2 de champ positif et induit des lignes de force de champ en coussin.Thus, a positive A3 term corresponds to a harmonic 2 of positive field strength and induces field strength lines cushion.

Dans ce contexte, la figure 5 représente en fonction de , les termes COS(), COS(3), COS (5)... pour  compris entre 0° et 90°.In this context, Figure 5 represents according to , the terms COS (), COS (3), COS (5) ... for  understood between 0 ° and 90 °.

Pour N() positif, comme dans le cas de la bobine principale, le terme A3 est positif si les conducteurs constituant le bobinage sont disposés entre =O° et =30°, valeurs pour lesquelles COS(3) est positif. Pour avoir un trés fort taux d'harmonique 3 créé par le bobinage principal, les conducteurs le constituant seront de manière préférentielle disposés entre 0° et 20' valeurs pour lesquelles COS(3) reste supérieur à 0.5 .For N () positive, as in the case of the coil main, the term A3 is positive if the drivers constituting the winding are arranged between  = O ° and  = 30 °, values for which COS (3) is positive. For have a very high harmonic rate 3 created by the main winding, the conductors constituting it will preferably be arranged between 0 ° and 20 ' values for which COS (3) remains greater than 0.5.

Il est possible d'augmenter la proportion d'harmonique 3 en inversant le sens du courant dans le bobinage auxiliaire; N() devient négatif et A3 demeure positif si COS(3) est négatif; il est donc possible d'introduire de cette façon de l'harmonique 3 positif en bobinant des conducteurs en sens inverse dans une position angulaire comprise entre 30° et 90°. On choisi de préférence, une position angulaire moyenne Mdes conducteurs 24, au moins dans la partie avant de la bobine 22, entre 55° et 65° afin que cette bobine ait une influence maximum dans cette région sur l'harmonique 3 car dans cette zone, COS(3) est trés proche de -1.It is possible to increase the proportion of harmonic 3 by reversing the direction of the current in the auxiliary winding; N () becomes negative and A3 remains positive if COS (3) is negative; it is therefore possible to introduce positive harmonic 3 in this way by winding conductors in the opposite direction in an angular position between 30 ° and 90 °. We preferably choose an average angular position  M of the conductors 24, at least in the front part of the coil 22, between 55 ° and 65 ° so that this coil has a maximum influence in this region on the harmonic 3 because in this area, COS (3) is very close to -1.

La situation angulaire des conducteurs de la bobine principale, entre 0° et 20°, introduit un pourcentage important d'harmonique 5 de la densité d'ampère-tours qu'il est possible de compenser par le même bobinage auxiliaire en plaçant les conducteurs 24 dans une zone où N ().COS (5) est négatif (afin de se soustraire à l'harmonique 5 introduit par la bobine principale) ce qui, pour N() négatif peut être réalisé en disposant la majorité des conducteurs 24 dans une position angulaire comprise entre 54° et 90°.The angular position of the coil conductors main, between 0 ° and 20 °, introduces a percentage important harmonic 5 of ampere-turns density that it is possible to compensate by the same winding auxiliary by placing the conductors 24 in an area where N () .COS (5) is negative (in order to avoid harmonic 5 introduced by the main coil) this which, for N () negative can be achieved by arranging the majority of conductors 24 in an angular position between 54 ° and 90 °.

De la même façon il est possible de compenser l'influence des harmoniques supérieurs introduits par le bobinage principal par une disposition adhéquate des conducteurs 24.In the same way it is possible to compensate for the influence higher harmonics introduced by the winding main by adequate provision of conductors 24.

Enfin, s'il est nécessaire, il est possible d'ajuster le pourcentage des différents harmoniques par rapport au fondamental en faisant varier, en fonction de la position le long de l'axe Z, la position angulaire moyenne M et/ou l'ouverture angulaire (1 - 2) des conducteurs 24.Finally, if necessary, it is possible to adjust the percentage of the different harmonics relative to the fundamental by varying, depending on the position along the Z axis, the average angular position  M and / or l angular opening ( 1 -  2 ) of the conductors 24.

En particulier, pour obtenir une action moins importante du bobinage 22 sur le taux d'harmonique 3 dans la partie la plus éloignée de l'écran, cela pour éviter de surconverger les faisceaux d'électrons, la position angulaire moyenne M augmente au fur et à mesure que l'on s'éloigne de l'écran.In particular, to obtain a less significant action of the winding 22 on the harmonic rate 3 in the most distant part of the screen, this to avoid over-converging the electron beams, the average angular position  M increases as and as we move away from the screen.

Cette structure de bobine permet en outre, de limiter à des valeurs acceptables la diminution du rapport L/R de la bobine de déflexion horizontale car dans ce cas les conducteurs 24 occupent une surface plus réduite que les conducteurs 20 de l'état de la technique.This coil structure also makes it possible to limit to acceptable values the decrease in the L / R ratio of the horizontal deflection coil because in this case the conductors 24 occupy a smaller area than conductors 20 of the state of the art.

Dans un mode de réalisation de l'invention, destinée à équiper un tube fabriqué par la société ZENITH, d'écran plat d'environ 40cm de diagonale, le bobinage auxiliaire est disposée dans le tiers avant du bobinage principal. Le bobinage 21 s'étend en Z sur une longueur d'environ 90mm et comporte 32 spires alors que le bobinage 22 s'étend le long de Z sur une longueur de 20mm et comporte 14 spires. Les deux bobinages sont disposés en série , de telle manière que le courant dans le bobinage auxiliaire circule en sens inverse du courant dans le bobinage principal. La disposition en série des deux bobinages n'est pas limitative, le bobinage 22 pouvant être alimenté de façon évidente par une seconde source extérieure. Les conducteurs 24 sont disposés autour d'une position angulaire M comprise entre 58° et 71°, croissante au fur et à mesure que l'on s'éloigne de la partie du bobinage la plus proche de l'écran du tube, les conducteurs 24 étant bobinés entre 54° et 80°. Le dispositif de déflexion étant divisé en trois zones, la zone avant 47, la plus proche de l'écran du tube , la zone médiane 46 et la zone arrière 45, les figures 6, 7, 8 représentent, le long de l'axe Z, les modifications de l'amplitude du champ ligne du déviateur 43 introduites par la bobine auxiliaire positionnée en 44 dans la partie avant 47 du bobinage principal, c'est-à-dire au plus prés de l'écran du tube. L' amplitude de l'harmonique 3 est à peu prés doublée, de 51 sans la bobine 22 à 41 après addition de cette bobine; ainsi l'amplitude obtenue 41 de l'harmonique 3 se retrouve supérieure à celle du fondamental 40 d'environ 12%. En outre, Dans la zone d'action 44 du bobinage auxiliaire, l'amplitude de l'harmonique 5 est réduite de 52 à 42, améliorant de ce fait la convergence des faisceaux dans les coins de l'écran.In one embodiment of the invention, intended to equip a tube manufactured by the company ZENITH, with a flat screen of approximately 40 cm diagonal, the auxiliary winding is arranged in the front third of the main winding. The coil 21 extends in Z over a length of approximately 90mm and has 32 turns while the coil 22 extends along Z over a length of 20mm and has 14 turns. The two windings are arranged in series, so that the current in the auxiliary winding flows in the opposite direction to the current in the main winding. The arrangement in series of the two windings is not limiting, the winding 22 being able to be obviously supplied by a second external source. The conductors 24 are arranged around an angular position  M of between 58 ° and 71 °, increasing as one moves away from the part of the winding closest to the screen of the tube, the conductors 24 being wound between 54 ° and 80 °. The deflection device being divided into three zones, the front zone 47, closest to the screen of the tube, the central zone 46 and the rear zone 45, FIGS. 6, 7, 8 show, along the axis Z, the modifications of the amplitude of the deflector line field 43 introduced by the auxiliary coil positioned at 44 in the front part 47 of the main winding, that is to say as close as possible to the screen of the tube. The amplitude of the harmonic 3 is roughly doubled, from 51 without the coil 22 to 41 after addition of this coil; thus the amplitude obtained 41 of the harmonic 3 is found to be greater than that of the fundamental 40 by about 12%. In addition, in the action zone 44 of the auxiliary winding, the amplitude of the harmonic 5 is reduced from 52 to 42, thereby improving the convergence of the beams in the corners of the screen.

Dans un mode de réalisation avantageux, certains des conducteurs 23 du bobinage principal 21 situés dans la partie médiane 46 du déviateur sont décalés vers l'intérieur de la bobine 21 sur une longueur 48. Les figures 9.1 et 9.2 illustrent ce mode de réalisation en montrant une bobine ligne dans laquelle l'ensemble des conducteurs sont décalés vers l'intérieur de la bobine. Dans une coupe suivant un plan perpendiculaire à Z passant par la zone 48, ce décalage est représenté par l'angle a.Ce décalage permet de diminuer localement, dans la zone 46, l'importance de l'harmonique 3 de la distribution angulaire de la densité d'ampère-tours dans le bobinage, dont une valeur excessive pourrait entrainer une déconvergence des faisceaux d'électrons, mais qu'il est nécessaire d'avoir en zone 47 pour pouvoir obtenir une correction efficace de la déformation en coussin. Adapté au tube ZENITH d'écran plat de 40cm de diagonale , les conducteurs de la bobine 21 du déviateur équipant ce tube sont décalés d'un angle égal à environ 10° dans la zone médiane 46.In an advantageous embodiment, some of the conductors 23 of the main winding 21 located in the middle part 46 of the diverter are shifted towards inside the coil 21 over a length 48. The Figures 9.1 and 9.2 illustrate this embodiment in showing a line coil in which all of conductors are shifted towards the inside of the coil. In a section along a plane perpendicular to Z passing through zone 48, this offset is represented by the angle a.This offset makes it possible to decrease locally, in zone 46, the importance of harmonic 3 of the angular distribution of ampere-turns density in the winding, an excessive value of which could lead to a deconvergence of electron beams, but that it it is necessary to have in zone 47 to be able to obtain effective correction of cushion deformation. Suitable for ZENITH flat screen tube 40cm diagonal, the conductors of the coil 21 of the deflector equipping this tube are offset by an angle equal to about 10 ° in the middle zone 46.

Dans un autre mode de réalisation , représenté à la figure 10, la bobine 22 créant un champ magnétique venant s'opposer à celui de la bobine principale 21, est constituée de conducteurs de la bobine principale, bobinés de telle façon qu'ils ouvrent une fenètre 35 dans la couronne 36 du bobinage principal, fenêtre s'étendant vers l'intérieur de la bobine 21; de ce fait le courant circule en sens inverse 30 et 31 dans les deux parties de bobinage 21 et 22.In another embodiment, shown in Figure 10, the coil 22 creating a magnetic field from oppose that of the main coil 21, is made up of main coil conductors, wound up in such a way that they open a window 35 in the crown 36 of the main winding, window extending inwardly of the coil 21; thereby current flows in opposite directions 30 and 31 in both winding parts 21 and 22.

Une autre façon de mettre en oeuvre le principe de l'invention est d'utiliser une bobine auxiliaire 22 dont les conducteurs sont en court-circuit sur eux-mêmes. Ainsi, le champ magnétique créé par la bobine principale 21 induit dans la bobine auxiliaire un courant qui tend à s'opposer à la variation de flux vue de cette bobine 22. Il apparait donc dans les brins de la bobine 22 un courant de sens opposé à celui circulant dans la bobine 21. Ce mode de réalisation permet une correction de la géométrie NORD/SUD plus importante que dans le cas où les bobines 21 et 22 sont en série car le courant induit atteint une valeur plus grande que celle du courant circulant dans la bobine principale. De plus, ce type de réalisation permet de simplifier le cablage des bobines 21 et 22 et évite de faire cheminer des fils soumis à de fortes tensions comme la tension de retour du balayage horizontal. Enfin, dans ce cas, le rapport L/R apparent est amélioré, les spires en court-circuit n'étant plus prises en compte dans la résistance du déviateur. Le tableau suivant compare le montage en série des bobines 21 et 22 avec ce mode de réalisation, les bobines 21 et 22 étant identiques dans les deux cas, le dispositif de déflexion équipé de ces bobines étant adapté au même tube ZENITH décrit précédemment; les mesures ont été effectuées à une fréquence de 32KHZ, une tension d'anode de 28KV, un angle de déflexion de 77°: BOBINE 22 EN SERIE AVEC 21 BOBINE 22 EN COURT-CIRCUIT L=102.4 µH L= 105.6 µH R= 0.227Ω R= 0.194Ω L/R = 451 µS L/R = 544 µS Icc = 12.6 A Icc = 12.65 A Another way of implementing the principle of the invention is to use an auxiliary coil 22 whose conductors are short-circuited on themselves. Thus, the magnetic field created by the main coil 21 induces in the auxiliary coil a current which tends to oppose the variation in flux seen from this coil 22. It therefore appears in the strands of the coil 22 a current of opposite direction to that circulating in the coil 21. This embodiment allows a greater correction of the NORTH / SOUTH geometry than in the case where the coils 21 and 22 are in series because the induced current reaches a value greater than that of the circulating current in the main coil. In addition, this type of embodiment makes it possible to simplify the wiring of the coils 21 and 22 and avoids running wires subjected to high voltages such as the return voltage of the horizontal scan. Finally, in this case, the apparent L / R ratio is improved, the short-circuited turns no longer being taken into account in the resistance of the deflector. The following table compares the series connection of the coils 21 and 22 with this embodiment, the coils 21 and 22 being identical in both cases, the deflection device equipped with these coils being adapted to the same ZENITH tube described above; the measurements were made at a frequency of 32KHZ, an anode voltage of 28KV, a deflection angle of 77 °: COIL 22 IN SERIES WITH 21 COIL 22 IN SHORT CIRCUIT L = 102.4 µH L = 105.6 µH R = 0.227Ω R = 0.194Ω L / R = 451 µS L / R = 544 µS Isc = 12.6 A Icc = 12.65 A

Claims (7)

  1. Deflection device for a colour cathode-ray tube with three coplanar guns, comprising a pair of horizontal deflection coils and a pair of vertical deflection coils, each horizontal deflection coil including a main deflection winding (21) extending over the length of the deflection device and an auxiliary deflection winding (122) arranged in the front part of the main coil and fed in such a way as to generate a magnetic field (31) opposed to the field of this main coil in the front part of each of the coils of the said pair of horizontal deflection coils, the third-order harmonic of the Fourier-series decomposition of the angular distribution of the ampere-turn density being substantially equal to or greater than that of the fundamental, characterized in that the conductors (24) of the said auxiliary winding (22) are arranged laterally around a mean angle (2M) relative to the horizontal deflection axis, this mean angle varying as a function of the position of the said conductors along the longitudinal axis (2) of the deflection device in such a way as to reduce the amplitude of the 5th harmonic of the Fourier series decomposition of the angular distribution of the ampere-turn density created by the said main deflection winding.
  2. Deflection device according to Claim 1, characterized in that the said mean angle (2M) is between 55° and 65°.
  3. Deflection device according to Claim 2, characterized in that the value of the said mean angle (2M) around which the conductors of the auxiliary winding (22) are arranged increases in proportion to the distance from the front part of this winding.
  4. Deflection device according to any one of the preceding claims, characterized in that the majority of the said conductors (24) of the said auxiliary winding are arranged laterally in an angular position lying between 54° and 90°.
  5. Deflection device according to any one of the preceding claims, characterized in that a part of the conductors (23) of the main winding (21), situated in the mid-part of this winding is offset inwards on the winding.
  6. Deflection device according to any one of the preceding claims, characterized in that the said conductors (24) of the said auxiliary coil (22) are short-circuited with themselves.
  7. Cathode-ray tube characterized in that it is equipped with a deflection device in accordance with any one of the preceding claims.
EP93907920A 1992-04-07 1993-04-02 Device for the deflexion of electron beams for cathode ray tubes, which is self-convergent and geometry corrected Expired - Lifetime EP0635163B1 (en)

Applications Claiming Priority (3)

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FR9204249 1992-04-07
FR9204249A FR2689679A1 (en) 1992-04-07 1992-04-07 Device for deflecting electron beams for self-converging cathode ray tubes and corrected in geometry.
PCT/FR1993/000331 WO1993020578A1 (en) 1992-04-07 1993-04-02 Device for the deflexion of electron beams for cathode ray tubes, which is self-convergent and geometry corrected

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EP0635163B1 true EP0635163B1 (en) 1998-12-16

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US5519371A (en) * 1993-12-22 1996-05-21 Sony Corporation Deflection apparatus
KR100192233B1 (en) * 1995-11-30 1999-06-15 구자홍 Deflection yoke for cathode ray tube
JP3543900B2 (en) * 1996-12-27 2004-07-21 松下電器産業株式会社 Cathode ray tube device
KR100609195B1 (en) * 1998-11-10 2006-08-02 마츠시타 덴끼 산교 가부시키가이샤 Deflection yoke and color picture tube comprising the same
FR2797993B1 (en) * 1999-08-30 2001-10-26 Thomson Tubes & Displays CATHODIC RAY TUBE DEFLECTION UNIT WITH SADDLE-SHAPED VERTICAL DEFLECTION COILS
FR2797994B1 (en) * 1999-08-30 2001-12-07 Thomson Tubes & Displays DEFLECTION UNIT FOR SELF-CONVERGING CATHODE RAY TUBE HAVING SEAT-SHAPED VERTICAL DEFLECTION COILS

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FR2411486A1 (en) * 1977-12-07 1979-07-06 Videon Sa ADVANCED DEVIATION COIL
NL8300031A (en) * 1983-01-06 1984-08-01 Philips Nv DEVICE FOR DISPLAYING TELEVISION IMAGES AND DEFLECTOR THEREFOR.
JPS59184439A (en) * 1983-04-01 1984-10-19 Hitachi Ltd Deflection yoke
NL8400886A (en) * 1984-03-21 1985-10-16 Philips Nv METHOD FOR MANUFACTURING A SADDLE DEFLECTION COIL FOR IMAGE DISPLAY AND DEFLECTION SYSTEM WITH SADDLE DEFLECTION COILS
US4556857A (en) * 1984-10-01 1985-12-03 General Electric Company Deflection yoke for small gun-base CRT
JPH01161644A (en) * 1987-12-18 1989-06-26 Victor Co Of Japan Ltd Deflection yoke
JP3002481B2 (en) * 1989-10-30 2000-01-24 株式会社日立製作所 Deflection yoke
US5077533A (en) * 1990-09-28 1991-12-31 Syntronic Instruments, Inc. Cathode ray tube deflection yoke arrangement

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KR950701765A (en) 1995-04-28
WO1993020578A1 (en) 1993-10-14
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FR2689679A1 (en) 1993-10-08
EP0635163A1 (en) 1995-01-25

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