EP0635163A1 - 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

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Publication number
EP0635163A1
EP0635163A1 EP93907920A EP93907920A EP0635163A1 EP 0635163 A1 EP0635163 A1 EP 0635163A1 EP 93907920 A EP93907920 A EP 93907920A EP 93907920 A EP93907920 A EP 93907920A EP 0635163 A1 EP0635163 A1 EP 0635163A1
Authority
EP
European Patent Office
Prior art keywords
winding
coil
conductors
deflection
deflection device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93907920A
Other languages
German (de)
French (fr)
Other versions
EP0635163B1 (en
Inventor
Bruno Roussel
Alain Dumesnil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomson Tubes and Displays SA
Original Assignee
Thomson Tubes and Displays SA
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Filing date
Publication date
Application filed by Thomson Tubes and Displays SA filed Critical Thomson Tubes and Displays SA
Publication of EP0635163A1 publication Critical patent/EP0635163A1/en
Application granted granted Critical
Publication of EP0635163B1 publication Critical patent/EP0635163B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 deflecting electron beams from an electron gun with three beams in line with a cathode ray tube comprising a substantially flat screen panel.
  • the deflection device In cathode ray tubes using an electron gun with three coplanar beams corresponding to the three primary colors Red, Green, Blue, the deflection device, also called deflector, has the function of deflecting the beams so as to make them explore the entire surface of the tube screen to generate the images and to ensure the convergence of these beams during all the exploration.
  • the volume swept by the electron beams is a pyramid whose apex coincides with the deflection center of the deflection device and whose intersection with a screen surface of large radius of curvature determines a figure with a defect in geometry called cushion. This geometrical deformation of the image is all the greater the greater the radius of curvature of the screen of the tube.
  • the so-called self-converging deflectors generate magnetic fields and astigmatic lines in order to ensure the convergence of the electron beams at the height of the perforations made in the color selection mask, 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 field field.
  • the deflection device for cathode ray tube with three coplanar guns comprises a pair of horizontal deflection coils and a pair of vertical deflection coils, each horizontal deflection coil being characterized in that the angular distribution of the ampere-turns density in the said coil changes by signs at at least one point in an area limited to the front part of this coil.
  • FIG. 1 shows a section along a plane perpendicular to the longitudinal axis Z of the tube situated in front of the deflector, on the screen side, of the deflection pyramidal volume; 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.
  • FIG. 2 is a perspective view of a saddle-shaped line coil of a known deflection device.
  • FIG. 3 is a perspective view of a saddle-shaped line coil according to the present invention.
  • FIG. 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. 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.
  • FIGS. 9 and 10 illustrate variants of the present invention.
  • the deflection system It is customary to divide the deflection system into three successive action zones along the Z axis; the rear zone, closest to the electron gun, has a particular influence on coma or difference in size of the green image compared to the blue and red images; the middle zone of the deflector acts more particularly on astigmatism or the convergence of red and blue electron beams; Finally, the front area, located closest to the screen of the tube acts on the geometry of the image that will form on the screen.
  • FIG. 1 shows the action of the lines of force of the magnetic fields of horizontal deflection 1, along the direction of the X axis and vertival 2, along the disrection of the Y axis, on the geometry of the image.
  • A the electron beam corresponding to the upper right corner of the image and in 3 and 4 the electron beams corresponding to the edges of the image.
  • the distribution of the turns must be of the line coil is such that the decomposition in Fourier series of the angular distribution of the ampere-turns density in the coil shows a significant harmonic percentage 3 compared to the fundamental.
  • This structure makes it possible to increase the part of harmonic 3 but also causes the super-convergence of the electron beams if this part is very important as it is the case when correcting the geometry of a screen with a large radius of 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 has the consequence of increasing the power supplied necessary for scanning the screen.
  • the line deflection coil consists of a winding in two parts: a main deflection winding extending along 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 winding 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 winding.
  • 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 invention. Given the symmetry along the Y axis, only the section of a half-coil is shown.
  • This half-coil comprises a first part constituting a main coil 21, the conductors 23 of which are supplied so that the current which flows through it in a certain direction 30 and a second part 22, constituting an auxiliary coil located at the front of the diverter, supplied in such a way that the current, in the conductors 24 flows there in a direction 31, opposite to the previous one.
  • the conductors 24 are arranged so that they occupy an opening angular ( ⁇ , • ⁇ j ) and are distributed around an average angle e ⁇ , on either side of which there is a substantially equal number of conductors 24.
  • the principle of the invention will be better understood by writing the equations which govern the magnetic deflection. Because of the symmetries of the windings of the deflector, the decomposition in Fourier series of the density of ampere-turns N (e) of a coil is written:
  • N ( ⁇ ) Al.COS ( ⁇ ) + A3.COS (3 ⁇ ) + A5.COS (5 ⁇ ) + ... + AK.C0S (K ⁇ ) +
  • H A1 / R + (A3 / R 3 ).
  • 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 Al / 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.
  • a positive A3 term corresponds to a harmonic 2 of positive field and induces lines of field strength in a cushion.
  • Figure 5 represents as a function of ⁇ , the terms COS (e), COS (3 ⁇ ), COS (5 ⁇ ) ... for e between 0 "and 90".
  • the conductors constituting it will preferably be arranged between 0 * and 20 * values for which C0S (3 ⁇ ) remains greater than 0.5.
  • the angular position of the conductors of the main coil introduces a large percentage of harmonics 5 of the density of ampere-turns which can be compensated by the same auxiliary winding by placing the conductors 24 in an area where N ( ⁇ ) .C0S (5 ⁇ ) is negative (in order to avoid the harmonic 5 introduced by the main coil) which, for N (e) negative can be achieved by placing the majority of the conductors 24 in an angular position between 54 * and 90 *.
  • the average angular position ⁇ increases as we s away from the screen.
  • This coil structure also makes it possible to limit the reduction in the L / R ratio of the horizontal deflection coil to acceptable values because in this case the conductors 24 occupy a smaller area than the conductors 20 of the prior 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 10
  • 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 ⁇ ⁇ 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.
  • FIG. 9.1 and 9.2 illustrate this embodiment by showing a line coil in which all of the conductors are offset towards the interior of the coil. In a section along a plane perpendicular to Z passing through zone 48, this offset is represented by the angle ⁇ .
  • This offset makes it possible to locally decrease, in zone 46, the importance of harmonic 3 of the angular distribution of the density of ampere-turns in the winding, an excessive value of which could lead to a deconvergence of the electron beams, but which it is necessary to have in zone 47 in order to be able to obtain an effective correction of the cushion deformation.
  • the conductors of the coil 21 of the diverter fitted to this tube are offset by an angle equal to approximately 10 "in the middle zone 46.
  • the coil 22 creating a magnetic field coming to oppose that of the main coil 21 consists of conductors of the main coil, wound in such a way that they open a window 35 in the crown 36 of the main winding, window extending towards the inside of the coil 21; therefore the current flows in opposite directions 30 and 31 in the two 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 flowing 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 current flowing in the main coil.
  • this type of embodiment simplifies the wiring of the coils.
  • 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 °:

Landscapes

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

Abstract

Device for the deflection of electron beams for cathode ray tubes whose horizontal deflection coils are comprised of a main winding (21) and an auxiliary winding (22) situated in front of the main winding and wherein the current circulates in a direction opposite (31) to the direction of circulation of the current (30) in the main winding. This type of deflection device allows, locally, to amplify the harmonic of rank 2 of the field created by the winding and to decrease the amplitude of the harmonic of rank 4. Thus, the deflection device of the invention will be corrected in geometry North/South while preserving the convergence of the beams throughout the surface of the screen. Said device is particularly adapted to tubes whose image screen has a pronounced radius of curvature.

Description

DISPOSITIF DE DEFLEXION DE8 FAISCEAUX D'ELECTRONSDEVICE FOR DEFLECTION OF 8 ELECTRON BEAMS
POUR TUBES A RAYONS CATHODIQUESFOR CATHODE RAY TUBES
AUTOCONVERGENT ET CORRIGE EN GÉOMÉTRIE.SELF-CONVERGING AND CORRECTING IN GEOMETRY.
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 deflecting electron beams from an electron gun with three beams in line with a cathode ray tube comprising a substantially flat screen panel.
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. 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 appelle coussin. Cette déformation géométrique de l'image est d'autant plus forte que le rayon de courbure de l'écran du tube est 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 très 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 .In cathode ray tubes using an electron gun with three coplanar beams corresponding to the three primary colors Red, Green, Blue, the deflection device, also called deflector, has the function of deflecting the beams so as to make them explore the entire surface of the tube screen to generate the images and to ensure the convergence of these beams during all the exploration. Under the action of uniform horizontal and vertical deflection fields, the volume swept by the electron beams is a pyramid whose apex coincides with the deflection center of the deflection device and whose intersection with a screen surface of large radius of curvature determines a figure with a defect in geometry called cushion. This geometrical deformation of the image is all the greater the greater the radius of curvature of the screen of the tube. The so-called self-converging deflectors generate magnetic fields and astigmatic lines in order to ensure the convergence of the electron beams at the height of the perforations made in the color selection mask, 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 field 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 and EAST / WEST geometry of the image by exerting in particular a compensation for the NORTH / SOUTH cushion deformation due to the flatness of the screen.
Il est connu, pour corriger les déformations résiduelles de 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 FR8702370, ou d'inverser le sens de circulation du courant dans une partie du bobinage ligne comme dans le brevet FR2411486. Cependant, aucun de ces dispositif 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. 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. Le dispositif de déflexion pour tube à rayons cathodiques à trois canons coplanaires, conforme à la présente invention, comprend une paire de bobines de déflexion horizontale et une paire de bobines de déflexion verticale, chaque bobine de déflexion horizontale étant caractérisée en ce que la distribution angulaire de la densité d'ampère-tours dans la dite bobine change de signe en au moins un point d'une zone limitée à la partie avant de cette bobine.It is known, to correct the residual geometrical deformations, to use metal parts extending in front of the deflection device as in the Toshiba patent US4257023, or a series of oriented magnets arranged on the deflection device or near it, as described in the Videocolor patent application FR8702370, or to reverse the direction of current flow in a part of the line winding as in patent FR2411486. However, none of these devices makes it possible to control the NORTH / SOUTH geometry of the image over the entire surface of a substantially planar screen while preserving the convergence of the beams over its entire surface. The object of the present invention is to minimize the deformation of NORTH / SOUTH geometry caused by a substantially flat screen while preserving the convergence of the electron beams. The deflection device for cathode ray tube with three coplanar guns, according to the present invention, comprises a pair of horizontal deflection coils and a pair of vertical deflection coils, each horizontal deflection coil being characterized in that the angular distribution of the ampere-turns density in the said coil changes by signs at at least one point in an area limited to the front part of this coil.
L'invention sera mieux comprise à l'aide des figures ci- aprés 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.The invention will be better understood with the aid of the figures below, among which: FIG. 1 shows a section along a plane perpendicular to the longitudinal axis Z of the tube situated in front of the deflector, on the screen side, of the deflection pyramidal volume; 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.
-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.FIG. 2 is a perspective view of a saddle-shaped line coil of a known deflection device. FIG. 3 is a perspective view of a saddle-shaped line coil according to the present invention. FIG. 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.
-La figure 5 illustre la variation angulaire entre-Figure 5 illustrates the angular variation between
0* et 90e des fonctions cos β, cos 3Θ, COS 5Θ... , 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.0 * and 90 e of the functions cos β, cos 3Θ, COS 5Θ ..., 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.
-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.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.
-Les figures 9 et 10 illustrent des variantes de la présente invention.FIGS. 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 deflection system into three successive action zones along the Z axis; the rear zone, closest to the electron gun, has a particular influence on coma or difference in size of the green image compared to the blue and red images; the middle zone of the deflector acts more particularly on astigmatism or the convergence of red and blue electron beams; Finally, the front area, located closest to the screen of the tube 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. 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.FIG. 1 shows the action of the lines of force of the magnetic fields of horizontal deflection 1, along the direction of the X axis and vertival 2, along the disrection of the Y axis, on the geometry of the image. In the figure are represented in A the electron beam corresponding to the upper right corner of the image and in 3 and 4 the electron beams corresponding to the edges of the image. By decomposing the magnetic fields and the forces they create on the electron beams, we notice that these forces (FVy and FHx), coming from the cushion forms of the line field and the barrel of the weft field, tend to draw on point A so as to correct the horizontal cushion deformation (NORTH / SOUTH) and to amplify the vertical cushion deformation. For the line deflection field to have a cushion-shaped distribution, the distribution of the turns must be of the line coil is such that the decomposition in Fourier series of the angular distribution of the ampere-turns density in the coil shows a significant harmonic percentage 3 compared 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 1'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 1'axe Z, les conducteurs latéraux 23 de la bobine 21 répondant au critère recherché sont contenus dans une ouverture angulaire oi 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 βi 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. 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 très 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.It is known that to increase the percentage of harmonic 3, the wire conductors of the coil 21, visible in FIG. 2, extending in the direction of the main axis Z must be packed as close as possible to the plane XZ . As shown in FIG. 2, representing a line coil 21 in the form of a saddle seen in perspective and FIG. 4 representing a coil of this type seen in section in a plane perpendicular to the axis Z, the lateral conductors 23 of the coil 21 meeting the desired criteria are contained in an angular opening oi as small as possible. If it is possible to achieve the convergence of the beams by such a distribution, correcting the NORTH / SOUTH geometry for a tube having a screen of small curvature, or even completely flat is then impossible, physical limitations due to the bulk of the wires do not not allow the desired values of βi to be reached in order to obtain a suitable harmonic level 3. In particular, it is impossible to obtain a harmonic coefficient 3 close to or greater than that of the fundamental. In addition, it is known that this coil structure introduces a large percentage of harmonics 5, responsible for the deconvergence of the electron beams in the corners of the screen. French patent FR2411486 describes a coil, shown in FIG. 2, in which the direction of the current in a part 20 (in dotted line in the figure) of the winding 21. This structure makes it possible to increase the part of harmonic 3 but also causes the super-convergence of the electron beams if this part is very important as it is the case when correcting the geometry of a screen with a large radius of 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 has the consequence of increasing the power supplied necessary for scanning 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 XZThe device of Figure 3 describes an embodiment of the present invention; the line deflection coil consists of a winding in two parts: a main deflection winding extending along the length of the deflector along the Z axis and whose lateral conductors are packed as close as possible to the XZ plane
-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.an auxiliary deflection winding 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 winding.
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. Lés conducteurs 24 sont disposés de telle façon qu'ils occupent une ouverture angulaire (β, • βj) et sont distribués autour d'un angle moyen e^, de part et d'autre duquel se trouve un nombre de conducteurs 24 sensiblement égal. 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(e) d'une bobine s'écrit :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 invention. Given the symmetry along the Y axis, only the section of a half-coil is shown. This half-coil comprises a first part constituting a main coil 21, the conductors 23 of which are supplied so that the current which flows through it in a certain direction 30 and a second part 22, constituting an auxiliary coil located at the front of the diverter, supplied in such a way that the current, in the conductors 24 flows there in a direction 31, opposite to the previous one. The conductors 24 are arranged so that they occupy an opening angular (β, • β j ) and are distributed around an average angle e ^, on either side of which there is a substantially equal number of conductors 24. The principle of the invention will be better understood by writing the equations which govern the magnetic deflection. Because of the symmetries of the windings of the deflector, the decomposition in Fourier series of the density of ampere-turns N (e) of a coil is written:
N(β) = Al.COS(θ)+A3.COS(3β)+A5.COS(5β) +...+AK.C0S(Kβ)+N (β) = Al.COS (θ) + A3.COS (3β) + A5.COS (5β) + ... + AK.C0S (Kβ) +
avec AK = (4 n) .COS(Kβ) .de Le champ magnétique créé prend l'expression:with AK = (4 n) .COS (Kβ) .de The magnetic field created takes the expression:
H=A1/R +(A3/R3). (X2 -Y2) +(A5/R5).(X4 -6.X2.Y2+Y4) + ...H = A1 / R + (A3 / R 3 ). (X 2 -Y 2 ) + (A5 / R 5 ). (X 4 -6.X 2 .Y 2 + Y 4 ) + ...
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 Al/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.. Ainsi, un terme A3 positif correspond à un harmonique 2 de champ positif et induit des lignes de force de champ en coussin.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 Al / 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. Thus, a positive A3 term corresponds to a harmonic 2 of positive field and induces lines of field strength in a cushion.
Dans ce contexte, la figure 5 représente en fonction de Θ, les termes COS(e), COS(3β), COS(5β)... pour e compris entre 0" et 90".In this context, Figure 5 represents as a function of Θ, the terms COS (e), COS (3β), COS (5β) ... for e between 0 "and 90".
Pour N(e) positif, comme dans le cas de la bobine principale, le terme A3 est positif si les conducteurs constituant le bobinage sont disposés entre e=0* et β=30", valeurs pour lesquelles C0S(3β) est positif. Pour avoir un très 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 C0S(3β) reste supérieur à 0.5 . II est possible d'augmenter la proportion d'harmonique 3 en inversant le sens du courant dans le bobinage auxiliaire; N(Θ) devient négatif et A3 demeure positif si C0S(3β) 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 ^ des 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(3e) est très proche de -1.For N (e) positive, as in the case of the main coil, the term A3 is positive if the conductors constituting the winding are arranged between e = 0 * and β = 30 ", values for which C0S (3β) is positive. To 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 C0S (3β) remains greater than 0.5. It is possible to increase the proportion of harmonic 3 by reversing the direction of the current in the auxiliary winding; N (Θ) becomes negative and A3 remains positive if C0S (3β) is negative; it is therefore possible to introduce harmonic 3 in this way by winding conductors in the opposite direction in an angular position between 30 * and 90 *. It is preferable to choose an average angular position ^ of the conductors 24, at least in the front part of the coil 22, between 55 * and 65 " so that this coil has maximum influence d In this region on harmonic 3 because in this zone, COS (3e) 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(Θ).C0S(5Θ) est négatif (afin de se soustraire à l'harmonique 5 introduit par la bobine principale) ce qui, pour N(e) 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 conductors of the main coil, between 0 * and 20 * , introduces a large percentage of harmonics 5 of the density of ampere-turns which can be compensated by the same auxiliary winding by placing the conductors 24 in an area where N (Θ) .C0S (5Θ) is negative (in order to avoid the harmonic 5 introduced by the main coil) which, for N (e) negative can be achieved by placing the majority of the 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. 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 e^ et/ou l'ouverture angulaire (β1 - β-.) des conducteurs 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 β augmente au fur et à mesure que l'on s'éloigne de l'écran.In the same way it is possible to compensate for the influence of the higher harmonics introduced by the main winding by an adequate arrangement of the conductors 24. Finally, if necessary, it is possible to adjust the percentage of the different harmonics relative to the fundamental by varying, as a function of the position along the Z axis, the mean angular position e ^ and / or the angular opening (β 1 - β-.) of the conductors 24. In particular, to obtain an action less of the winding 22 on the harmonic ratio 3 in the part furthest from the screen, this to avoid over-converging the electron beams, the average angular position β increases as we s 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 the reduction in the L / R ratio of the horizontal deflection coil to acceptable values because in this case the conductors 24 occupy a smaller area than the conductors 20 of the prior 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 10In 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 10
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 Θ^ 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. 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 11extends 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 Θ ^ 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 changes in 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. In an advantageous embodiment, some of the conductors 23 of the main winding 21 located in the middle part 46 of the deflector are offset towards 11
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 α.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.the interior of the coil 21 over a length 48. Figures 9.1 and 9.2 illustrate this embodiment by showing a line coil in which all of the conductors are offset towards the interior of the coil. In a section along a plane perpendicular to Z passing through zone 48, this offset is represented by the angle α. This offset makes it possible to locally decrease, in zone 46, the importance of harmonic 3 of the angular distribution of the density of ampere-turns in the winding, an excessive value of which could lead to a deconvergence of the electron beams, but which it is necessary to have in zone 47 in order to be able to obtain an effective correction of the cushion deformation. Adapted to the 40cm diagonal ZENITH flat screen tube, the conductors of the coil 21 of the diverter fitted to this tube are offset by an angle equal to approximately 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 fenêtre 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, represented in FIG. 10, the coil 22 creating a magnetic field coming to oppose that of the main coil 21, consists of conductors of the main coil, wound in such a way that they open a window 35 in the crown 36 of the main winding, window extending towards the inside of the coil 21; therefore the current flows in opposite directions 30 and 31 in the two 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 câblage des bobinesAnother 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 flowing 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 current flowing in the main coil. In addition, this type of embodiment simplifies the wiring of the coils.
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 et21 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 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°: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 °:

Claims

13 13
REVENDICATIONS
1-Dispositif de déflexion pour tube à rayons cathodiques à trois canons coplanaires, comprennant une paire de bobines de déflexion horizontale et une paire de bobines de déflexion verticale, chaque bobine de déflexion horizontale étant caractérisée en ce que la distribution angulaire de la densité d'ampère-tours dans la dite bobine change de signe en au moins un point d'une zone limitée à la partie avant de cette bobine.1-Deflection device for 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 being characterized in that the angular distribution of the density of ampere-turns in the said coil changes sign at at least one point in an area limited to the front part of this coil.
2-Dispositif de déflexion selon la revendication l caractérisé en ce que, dans la partie avant de chacune des bobines de la paire de bobines de déflexion horizontale , l'amplitude de l'harmonique de rang trois de la décomposition en série de Fourier de la distribution angulaire de la densité d'ampère-tours est sensiblement égale ou supérieure à celle du fondamental.2-deflection device according to claim l characterized in that, in the front part of each of the coils of the pair of horizontal deflection coils, the amplitude of the harmonic of rank three of the Fourier series decomposition of the angular distribution of ampere-turns density is substantially equal to or greater than that of the fundamental
3-Dispositif de déflexion selon les revendications 1 ou 2 caractérisé en ce que la paire de bobines de déflexion horizontale est constituée de deux bobines comportant chacune deux parties de bobinage: -un bobinage de déflexion principal s'étendant sur la longueur du dispositif de déflexion3-deflection device according to claims 1 or 2 characterized in that the pair of horizontal deflection coils consists of two coils each comprising two winding parts: -a main deflection winding extending over the length of the deflection device
-un bobinage de déflexion auxiliaire disposé dans la partie avant de la bobine principale et alimenté de façon à engendrer un champ magnétique opposé au champ de cette bobine principale 4- Dispositif de déflexion selon la revendication 3 caractérisé en ce que les conducteurs du bobinage auxiliaire sont, au moins dans la partie avant de ce bobinage, latéralement disposés autour d'un angle moyen choisi entre 55e et 65°.an auxiliary deflection winding disposed in the front part of the main coil and supplied so as to generate a magnetic field opposite to the field of this main coil 4- Deflection device according to claim 3 characterized in that the conductors of the auxiliary winding are, at least in the front part of this winding, laterally arranged around an average angle chosen between 55 e and 65 °.
5- Dispositif de déflexion selon la revendication 3 caractérisé en ce que les conducteurs du bobinage auxiliaire sont latéralement disposés autour d'un angle moyen dont la valeur varie en fonction de la position des conducteurs selon l'axe principal du tube5- deflection device according to claim 3 characterized in that the conductors of the auxiliary winding are laterally arranged around a mean angle whose value varies depending on the position of the conductors along the main axis of the tube
6-Dispositif de déflexion selon la revendication 5 caractérisé en ce que la valeur de l'angle moyen autour duquel sont disposés les conducteurs du bobinage auxiliaire augmente au fur et à mesure que l'on s'éloigne de la partie avant de ce bobinage6-Deflection device according to claim 5 characterized in that the value of the average angle around which are arranged the conductors of the auxiliary winding increases as one moves away from the front part of this winding
7-Dispositif de déflexion selon l'une quelconque des revendications 3 à 6 caractérisé en ce que la majorité des conducteurs du bobinage auxiliaire sont latéralement disposés dans une position angulaire comprise entre 54° et 90* 7-deflection device according to any one of claims 3 to 6 characterized in that the majority of the conductors of the auxiliary winding are laterally disposed in an angular position between 54 ° and 90 *
8-Dispositif de déflexion selon l'une des revendications 3 à 7 caractérisé en ce que les conducteurs du bobinage principal et du bobinage auxiliaire sont disposés en série8-Deflection device according to one of claims 3 to 7 characterized in that the conductors of the main winding and the auxiliary winding are arranged in series
9-Dispositif de déflexion selon l'une quelconque des revendications 3 à 8 caractérisée en ce que les conducteurs de la bobine auxiliaire sont constitués par une partie des conducteurs de la bobine principale9-Deflection device according to any one of claims 3 to 8 characterized in that the conductors of the auxiliary coil consist of a part of the conductors of the main coil
10-Dispositif de deflexion selon l'une quelconque des revendications 3 à 7 caractérisé en ce que les conducteurs de la bobine auxiliaire sont en court-circuit avec eux-mêmes10-deflection device according to any one of claims 3 to 7 characterized in that the conductors of the auxiliary coil are short-circuited with themselves
11-Dispositif de déflexion selon l'une quelconque des revendications 3 à 10 caractérisé en ce qu'une partie des conducteurs du bobinage principal, située dans la partie médiane de ce bobinage, est décalée vers l'intérieur du bobinage11-Deflection device according to any one of claims 3 to 10 characterized in that a part of the conductors of the main winding, located in the middle part of this winding, is offset towards the inside of the winding
11-Tube à rayons cathodiques caractérisé en ce qu'il est équipé d'un dispositif de déflexion conforme à l'une quelconque des revendications précédentes. 11-Cathode ray tube characterized in that it is equipped with a deflection device according to 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)

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FR9204249A FR2689679A1 (en) 1992-04-07 1992-04-07 Device for deflecting electron beams for self-converging cathode ray tubes and corrected in geometry.
FR9204249 1992-04-07
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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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
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
FR2797993B1 (en) * 1999-08-30 2001-10-26 Thomson Tubes & Displays CATHODIC RAY TUBE DEFLECTION UNIT WITH SADDLE-SHAPED VERTICAL DEFLECTION COILS

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KR100430129B1 (en) 2004-07-15
WO1993020578A1 (en) 1993-10-14
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EP0635163B1 (en) 1998-12-16
FR2689679A1 (en) 1993-10-08

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