EP0107987B2 - Transforming method of a deflection unit permitting its use in autoconvergent imaging tubes of different dimensions, and deflection unit so obtained - Google Patents

Transforming method of a deflection unit permitting its use in autoconvergent imaging tubes of different dimensions, and deflection unit so obtained Download PDF

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Publication number
EP0107987B2
EP0107987B2 EP83401888A EP83401888A EP0107987B2 EP 0107987 B2 EP0107987 B2 EP 0107987B2 EP 83401888 A EP83401888 A EP 83401888A EP 83401888 A EP83401888 A EP 83401888A EP 0107987 B2 EP0107987 B2 EP 0107987B2
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EP
European Patent Office
Prior art keywords
deflection
tube
screen
coil
horizontal
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EP83401888A
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German (de)
French (fr)
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EP0107987B1 (en
EP0107987A1 (en
Inventor
Jean-Pierre Fourché
Marc Milili
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Videocolor SA
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Videocolor SA
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Priority to AT83401888T priority Critical patent/ATE23763T1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • H01J29/766—Deflecting by magnetic fields only using a combination of saddle coils and toroidal windings

Definitions

  • the invention relates to a method for transforming a deflector for a color image tube, which comprises three electron guns producing beams in the same plane, and such that the tube-deflector assembly is self-converging, so that this tube is suitable - with the same self-convergence property - for a similar tube but of different dimensions, in particular smaller, or more generally, so that it is suitable for a family of tubes of the same deflection angle.
  • a device corresponding to the preamble of claim 1 is described in GB-A-2 029 089.
  • a tube for color television comprises three electron guns, each of which is intended to excite on the screen a phosphor substance of a determined color, red, green, or blue. At all times these three beams strike a triplet of luminescent substances on the screen.
  • the displacement of these three electron beams is obtained by means of a deflector mounted on the neck of the tube and which comprises two coils, each of which is traversed by an alternating electric current generating a variable magnetic field for deflecting the electronic beams.
  • One of these coils allows horizontal scanning, that is to say in lines, of the screen and the other coil is intended for vertical scanning, or raster scanning.
  • the same deflector can be suitable for two self-converging tubes which differ only in the size of the screen (and therefore also in the length of the conical part) provided that they are modified - in order to reduce the anisotropic astigmatism (cause of convergence faults between horizontal lines) - the distance separating the center of deflection - line from the center of deviation-frame (see for example GB-A-2 029 089).
  • one coil is moved axially relative to the other or the length of each coil is varied.
  • the invention makes it possible to further simplify the modification of a diverter for self-converging tube in order to adapt it to a tube of smaller dimensions.
  • the deflector is of the saddle-torus type with a saddle-shaped horizontal deflection winding ending at the front and at the rear by buns extending in planes perpendicular to the axis of the tube between which is disposed the vertical deflection coil in the shape of a torus, we can arrange the magnetic screen between the rear bun of the horizontal deflection coil and the rear face of the vertical deflection coil.
  • the deflector is of the saddle type
  • the vertical deflection coil being in the form of a saddle, like the horizontal deflection coil, with front and rear buns
  • the magnetic screen is for example placed between the rear bunches of the two coils.
  • the magnetic screen modifies the field lines in such a way that the center of vertical deflection is moved forward (towards the screen of the tube) and the center of horizontal deflection is moved towards the rear (towards the barrels).
  • the assembly formed by the color image tube and the deflector is self-converging;
  • the tube includes cannons producing coplanar beams and a mask with oblong holes.
  • the deflector 20 is mounted around the neck 21 and around the conical part 22 of the tube 23 which is connected to the neck. It includes a horizontal deflection coil 24 in the form of a saddle with a central part 25 conforming to the contour of the part of the tube which it surrounds and end buns, respectively 26 and 27, extending in a plane perpendicular to the axis 15 of the tube.
  • the role of the coil 24 is to produce the magnetic field horizontally displacing the electron beams produced by the three guns 28 inside the tube.
  • Another coil 29 in the form of a torus with a substantially rectangular section is wound on a core of ferromagnetic material such as ferrite and surrounds the coil 24 between the front 26 and rear buns 27. It ensures the vertical displacement of the beams produced by the barrels 28 .
  • the diagonal of the screen 30 having a length of 67 cm, the coil 24 of horizontal deflection has a center of deflection 31 on the axis 15, which is separated from the center 32 of vertical deflection, or weft, of the coil 29 by a distance of the order of a few millimeters (see Figs. 3 and 4). It is the center of horizontal deflection 31 which is closest to the screen 30.
  • the screen 30 ′ shown in broken lines in FIG. 1, is smaller than the screen 30, its diagonal having a length of 56 cm, but moreover having the same characteristics : same barrels 28, same diameter and same length of the neck 21, same opening angle of the conical part 22, it is necessary that the deflection centers, respectively horizontal and vertical, of the deflector are practically coincident or at a short distance from it one of the other.
  • the common center 33 of horizontal and vertical deflection for a deflector suitable for a tube whose screen 30 ′ has a diagonal of 56 cm must be between the centers of horizontal 31 and vertical deflection 32.
  • the tube whose screen has a 56 cm diagonal has a center of horizontal deflection of its deflector closer to the barrels and a center of vertical deflection of its deflector more distant from the barrels.
  • a magnetic screen 35 (FIG. 2) which, in the example, is between the rear bun 27 of the coil 24 of horizontal deflection in the form of a saddle and the rear part 36 of the coil 29 of vertical deflection in the form of a torus.
  • This magnetic screen is made of a material, for example mumetal, with high magnetic permeability, greater than 1.
  • FIG. 3 is a diagram showing the variations along the axis 15 of the magnetic field H. produced by the coil 29 of vertical deflection.
  • the curve 37 in solid lines corresponds to the magnetic field in the absence of the screen 35.
  • the center 32 of vertical deflection is the projection on the axis 15 of the center of gravity of the surface delimited by this curve 37 and the axis 15.
  • Figure 4 is a diagram similar to that of Figure 3 but showing the variations along the axis 15 of the magnetic field H o produced by the coil 24 of horizontal deflection.
  • the curve 40 in solid lines corresponds to the absence of magnetic screen 35.
  • the center of horizontal deflection of the deflector 20 is at point 31.
  • the rear part 41 of the curve 40 moves backwards, thus becoming curve 42 in broken lines. Under these conditions, the center of horizontal deviation moves at 33 backwards.
  • FIG. 5 is a diagram showing the vertical deflection coil 29 with the field lines produced by the latter in the horizontal plane (plane ZX). It can be seen that the field lines in the vicinity of the magnetic screen 35 and of the rear part 36 of the coil 29 in the shape of a torus are deviated from their initial trajectory 43 and moved forward (at 43 ′) due to the mirror effect produced by this magnetic screen 35, which explains the displacement of the center of vertical deviation (FIG. 3).
  • Figure 6 is a diagram similar to that of Figure 5, but for the coil 24 of horizontal deflection.
  • the field lines 44 at the rear of the magnetic screen 35 are pushed back even more, which explains the passage from curve 41 to curve 42 in FIG. 4 and the displacement of the center.
  • horizontal deflection when said screen 35 is introduced between the bun 27 and the rear part 36 of the coil 29.
  • the quality of the image obtained on the screen of the tube depends on the shape, the dimensions and the position of the magnetic screen 35.
  • the screen 35 we have available '' a means of additional adjustment of the tube. This adjustment is obtained by modifying the position and / or the dimensions and / or the shape of the screen 35.
  • the screen 35 increases the horizontal deflection and decreases the vertical deflection. As a result, the supply energy of the horizontal deflection coil is lower while the supply energy of the vertical deflection coil is greater.
  • the magnetic screen 35 is in two parts constituting the two halves of a crown extending in a plane perpendicular to the axis 15, practically all around this axis.
  • the deflector has a plastic carcass 50 with central cylindrical hole for the passage of the neck 21 and inside which is the main part 25 of the horizontal deflection winding 24. Around this carcass is arranged the vertical deflection winding.
  • the rear bun 27 is applied against the rear face 51 of a crown, or end flange 52 of the carcass 50.
  • the coil 29 (not visible in the figure 7) is on the other side, relative to the bun 27, of this crown 52.
  • the magnetic screen 35 is disposed between the bun 27 and the rear face 51 of the crown 52. Its separation into two parts is intended to allow its mounting.
  • the magnetic screen 35 is formed of four segments 35 1 , 35 2 , 35 3 and 35 4 of a crown, which are distributed regularly around the axis 15, each segment being shaped and arranged in such a way that the bisector of the quadrant that it occupies constitutes an axis of symmetry for this segment.
  • the horizontal deflection coil 24a is identified with the coil 24 of FIG. 2.
  • the vertical deflection coil 54 is, like the saddle-shaped coil 24a. This coil 54 is shorter than the coil 24a; it surrounds the latter and it has front buns 55 and rear 56 extending perpendicular to the axis of the tube.
  • the magnetic screen 35a is disposed between the rear bun 27a of the coil 24a and the rear bun 56 of the coil 54.
  • a ferrite core 57 is disposed between the buns 55 and 56 around the central part of the coil 54.
  • the magnetic screen 35 b has a part 60 perpendicular to the axis 15 and an extension 61 towards the rear, that is to say towards the barrels, and in an oblique direction.
  • This extension increases, to a greater extent than the simple crown 35 or 35a, the horizontal deflection field at the rear of the deflector.

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

A deviator associated with an autoconvergent color image tube is modified so that it may be used in combination with a tube of the same type, but having an image screen of smaller size, the horizontal and/or vertical deviation center being displaced. According to the invention, a magnetic screen is placed across the magnetic field lines produced by the vertical and horizontal deviation coils whereby the deviation centers are displaced without any modification of the coils.

Description

L'invention est relative à un procédé de transformation d'un déviateur pour tube à images en couleurs, qui comprend trois canons à électrons produisant des faisceaux dans un même plan, et tel que l'ensemble tube-déviateur soit autoconvergent, afin que ce tube convienne - avec la même propriété d'autoconvergence - pour un tube analogue mais de dimensions différentes, en particulier plus réduites, ou de façon plus générale, afin qu'il convienne pour une famille de tubes de même angle de déflexion.The invention relates to a method for transforming a deflector for a color image tube, which comprises three electron guns producing beams in the same plane, and such that the tube-deflector assembly is self-converging, so that this tube is suitable - with the same self-convergence property - for a similar tube but of different dimensions, in particular smaller, or more generally, so that it is suitable for a family of tubes of the same deflection angle.

Un dispositif correspondant au préamble de la revendication 1 est décrit dans GB-A-2 029 089.A device corresponding to the preamble of claim 1 is described in GB-A-2 029 089.

On sait qu'un tube pour la télévision en couleurs comprend trois canons à électrons dont chacun est destiné à exciter sur l'écran une substance luminophore d'une couleur déterminée, rouge, verte, ou bleue. A chaque instant ces trois faisceaux frappent un triplet de substances luminescentes sur l'écran. Le déplacement de ces trois faisceaux d'électrons est obtenu grâce à une déviateur monté sur le col du tube et qui comprend deux bobines dont chacune est parcourue par un courant électrique alternatif engendrant un champ magnétique variable pour dévier les faisceaux électroniques. L'une de ces bobines permet le balayage horizontal, c'est-à-dire en lignes, de l'écran et l'autre bobine est destinée au balayage vertical, ou balayage en trame.It is known that a tube for color television comprises three electron guns, each of which is intended to excite on the screen a phosphor substance of a determined color, red, green, or blue. At all times these three beams strike a triplet of luminescent substances on the screen. The displacement of these three electron beams is obtained by means of a deflector mounted on the neck of the tube and which comprises two coils, each of which is traversed by an alternating electric current generating a variable magnetic field for deflecting the electronic beams. One of these coils allows horizontal scanning, that is to say in lines, of the screen and the other coil is intended for vertical scanning, or raster scanning.

On comprend aisément que la conception et la mise au point des bobinages d'un déviateur sont des opérations difficiles car les trois faisceaux électroniques doivent converger sur l'écran en tous ses points et chaque faisceaux doit être focalisé au centre de l'écran, et cela avec un tube qui ne présente pas de symétrie de révolution, un écran sensiblement plat et des canons produisant des faisceaux dans un même plan. Ainsi pour mettre au point un ensemble tube-déviateur autoconvergent, il faut établir un compromis entre un certain nombre d'exigences contradictoires. Il en résulte qu'un déviateur conçu pour un tube de type et dimensions déterminés ne convient pas pour un tube d'un autre type et/ou d'autres dimensions.It is easily understood that the design and development of the windings of a deflector are difficult operations because the three electron beams must converge on the screen at all its points and each beam must be focused in the center of the screen, and this with a tube which has no symmetry of revolution, a substantially flat screen and cannons producing beams in the same plane. Thus to develop a self-converging tube-deflector assembly, it is necessary to establish a compromise between a certain number of contradictory requirements. As a result, a diverter designed for a tube of a given type and dimensions is not suitable for a tube of another type and / or of other dimensions.

On a cependant déjà observé qu'un même déviateur peut convenir à deux tubes autoconver- gents qui ne diffèrent que par la dimension de l'écran (et donc également par la longueur de la partie conique) à condition de modifier - afin de réduire l'astigmatisme anisotrope (cause de défauts de convergence entre lignes horizontales) - la distance séparant le centre de déviation- ligne du centre de déviation-trame (voir par exemple GB-A-2 029 089). Pour cette modification jusqu'à présent on déplace axialement une bobine par rapport à l'autre ou on fait varier la longueur de chaque bobine.It has however already been observed that the same deflector can be suitable for two self-converging tubes which differ only in the size of the screen (and therefore also in the length of the conical part) provided that they are modified - in order to reduce the anisotropic astigmatism (cause of convergence faults between horizontal lines) - the distance separating the center of deflection - line from the center of deviation-frame (see for example GB-A-2 029 089). For this modification so far, one coil is moved axially relative to the other or the length of each coil is varied.

L'invention permet de simplifier encore la modification d'un déviateur pour tube autoconvergent afin de l'adapter à un tube de dimensions plus réduites.The invention makes it possible to further simplify the modification of a diverter for self-converging tube in order to adapt it to a tube of smaller dimensions.

Elle est caractérisée en ce que, selon la revendication 1, on dispose un élément magnétique tel qu'un ecran à travers les lignes des champs magnétiques produits par les bobines afin de faire varier la distance séparant les centres de déviation verticale et horizontale.It is characterized in that, according to claim 1, there is a magnetic element such as a screen across the lines of the magnetic fields produced by the coils in order to vary the distance separating the centers of vertical and horizontal deflection.

Ainsi, il n'est nécessaire ni de modifier ni de déplacer les bobinages.Thus, there is no need to modify or move the windings.

Lorsque le déviateur est du type selle-tore avec un bobinage de déviation horizontale en forme de selle se terminant à l'avant et à l'arrière par des chignons s'étendant dans des plans perpendiculaires à l'axe du tube entre lesquels est disposée la bobine de déviation verticale en forme de tore, on peut disposer l'écran magnétique entre le chignon arrière de la bobine de déviation horizontale et la face arrière de la bobine de déviation verticale.When the deflector is of the saddle-torus type with a saddle-shaped horizontal deflection winding ending at the front and at the rear by buns extending in planes perpendicular to the axis of the tube between which is disposed the vertical deflection coil in the shape of a torus, we can arrange the magnetic screen between the rear bun of the horizontal deflection coil and the rear face of the vertical deflection coil.

De même quand le déviateur est du type selle- selle, la bobine de déviation verticale étant en forme de selle, comme la bobine de déviation horizontale, avec des chignons avant et arrière, l'écran magnétique est par exemple disposé entre les chignons arrières des deux bobines.Similarly, when the deflector is of the saddle type, the vertical deflection coil being in the form of a saddle, like the horizontal deflection coil, with front and rear buns, the magnetic screen is for example placed between the rear bunches of the two coils.

Dans les deux cas mentionnés ci-dessus, l'écran magnétique modifie les lignes de champ de manière telle que le centre de déviation verticale est déplacé vers l'avant (vers l'écran du tube) et le centre de déviation horizontale est déplacé vers l'arrière (vers les canons).In the two cases mentioned above, the magnetic screen modifies the field lines in such a way that the center of vertical deflection is moved forward (towards the screen of the tube) and the center of horizontal deflection is moved towards the rear (towards the barrels).

D'autres caractéristiques et avantages de l'invention apparatîront avec la description de certains de ses modes de réalisation, celle-ci étant effectuée en se référent aux dessins ci-annexés sur lesquels:

  • - la figure 1 est une vue schématique d'ensemble d'un tube de télévision avec le déviateur et les canons à électrons.
  • - la figure 2 est une demie vue en coupe axiale d'un déviateur selon l'invention et des canons,
  • - les figures 3 à 6 sont des diagrammes et schémas de champs magnétiques et lignes de champs correspondant au déviateur de la figure 2,
  • - la figure 7 est une vue par la face arrière du déviateur de la figure 2,
  • - la figure 8 est une vue analogue à celle de la figure 7 pour une autre variante, et
  • - la figure 9 est une vue analogue à celle de la figure 2 pour une autre variante, et
  • - la figure 10 est également une vue analogue à celle de la figure 2 encore pour une autre variante.
Other characteristics and advantages of the invention will appear with the description of some of its embodiments, this being carried out with reference to the attached drawings in which:
  • - Figure 1 is a schematic overview of a television tube with the deflector and the electron guns.
  • FIG. 2 is a half view in axial section of a deflector according to the invention and of the guns,
  • FIGS. 3 to 6 are diagrams and diagrams of magnetic fields and field lines corresponding to the deflector of FIG. 2,
  • FIG. 7 is a view from the rear face of the deflector in FIG.
  • FIG. 8 is a view similar to that of FIG. 7 for another variant, and
  • FIG. 9 is a view similar to that of FIG. 2 for another variant, and
  • - Figure 10 is also a view similar to that of Figure 2 again for another variant.

Dans l'exemple, l'ensemble formé par le tube à images en couleurs et le déviateur est autoconvergent; le tube comporte des canons produisant des faisceaux coplanaires et un masque à trous oblongs. Le déviateur 20 est monté autour du col 21 et autour de la partie conique 22 du tube 23 qui se raccorde au col. Il comprend un bobinage de déflexion horizontale 24 en forme de selle avec une partie centrale 25 épousant le contour de la partie du tube qu'il entoure et des chignons d'extrémité, respectivement 26 et 27, s'étendant dans un plan perpendiculaire à l'axe 15 du tube.In the example, the assembly formed by the color image tube and the deflector is self-converging; the tube includes cannons producing coplanar beams and a mask with oblong holes. The deflector 20 is mounted around the neck 21 and around the conical part 22 of the tube 23 which is connected to the neck. It includes a horizontal deflection coil 24 in the form of a saddle with a central part 25 conforming to the contour of the part of the tube which it surrounds and end buns, respectively 26 and 27, extending in a plane perpendicular to the axis 15 of the tube.

La bobine 24 a pour rôle de produire le champ magnétique déplaçant horizontalement les faisceaux électroniques produits par les trois canons 28 à l'intérieur du tube.The role of the coil 24 is to produce the magnetic field horizontally displacing the electron beams produced by the three guns 28 inside the tube.

Une autre bobine 29 en forme de tore à section sensiblement rectangulaire est enroulée sur un noyau en matériau ferromagnétique tel que la ferrite et entoure la bobine 24 entre les chignons avant 26 et arrière 27. Elle assure le déplacement vertical des faisceaux produits par les canons 28.Another coil 29 in the form of a torus with a substantially rectangular section is wound on a core of ferromagnetic material such as ferrite and surrounds the coil 24 between the front 26 and rear buns 27. It ensures the vertical displacement of the beams produced by the barrels 28 .

Pour un tube de grande dimension, dont la diagonale de l'écran 30 a une longueur de 67 cm, la bobine 24 de déflexion horizontale présente un centre de déflexion 31 sur l'axe 15, qui est séparé du centre 32 de déflexion verticale, ou trame, de la bobine 29 par une distance de l'ordre de quelques millimètres (voir Figs. 3 et 4). C'est le centre de déflexion horizontale 31 qui est le plus proche de l'écran 30.For a large tube, the diagonal of the screen 30 having a length of 67 cm, the coil 24 of horizontal deflection has a center of deflection 31 on the axis 15, which is separated from the center 32 of vertical deflection, or weft, of the coil 29 by a distance of the order of a few millimeters (see Figs. 3 and 4). It is the center of horizontal deflection 31 which is closest to the screen 30.

Pour un tube à images en couleurs dont l'écran 30', représenté en traits interrompus sur la figure 1, est de plus petite dimension que l'écran 30, sa diagonale ayant une longueur de 56 cm, mais présentant par ailleurs les mêmes caractéristiques: mêmes canons 28, même diamètre et même longueur du col 21, même angle d'ouverture de la partie cônique 22, il est nécessaire que les centres de déflexion, respectivement horizontale et verticale, du déviateur soient pratiquement confondus ou à faible distance l'un de l'autre. Le centre commun 33 de déflexion horizontale et verticale pour un déviateur adapté à un tube dont l'écran 30' a une diagonale de 56 cm doit être entre les centres de déflexion horizontale 31 et verticale 32. Autrement dit, par rapport à un tube d'écran de diagonale 67 cm, le tube dont l'écran a une diagonale de 56 cm a un centre de déflexion horizontale de son déviateur plus rapproché des canons et un centre de déflexion verticale de son déviateur plus éloigné des canons.For a color image tube, the screen 30 ′, shown in broken lines in FIG. 1, is smaller than the screen 30, its diagonal having a length of 56 cm, but moreover having the same characteristics : same barrels 28, same diameter and same length of the neck 21, same opening angle of the conical part 22, it is necessary that the deflection centers, respectively horizontal and vertical, of the deflector are practically coincident or at a short distance from it one of the other. The common center 33 of horizontal and vertical deflection for a deflector suitable for a tube whose screen 30 ′ has a diagonal of 56 cm must be between the centers of horizontal 31 and vertical deflection 32. In other words, with respect to a tube d '67 cm diagonal screen, the tube whose screen has a 56 cm diagonal has a center of horizontal deflection of its deflector closer to the barrels and a center of vertical deflection of its deflector more distant from the barrels.

Pour permettre ce déplacement des centres de déflexion horizontale et verticale sans modifier ni la position relative ni la configuration des bobines du déviateur 20, selon l'invention on dispose un écran magnétique 35 (figure 2) qui, dans l'exemple, est entre le chignon arrière 27 de la bobine 24 de déflexion horizontale en forme de selle et la partie arrière 36 de la bobine 29 de déviation verticale en forme de tore.To allow this displacement of the horizontal and vertical deflection centers without modifying either the relative position or the configuration of the coils of the deflector 20, according to the invention there is a magnetic screen 35 (FIG. 2) which, in the example, is between the rear bun 27 of the coil 24 of horizontal deflection in the form of a saddle and the rear part 36 of the coil 29 of vertical deflection in the form of a torus.

Cet écran magnétique est en un matériau, par exemple le mumétal, à perméabilité magnétique élevée, supérieure à 1.This magnetic screen is made of a material, for example mumetal, with high magnetic permeability, greater than 1.

La figure 3 est un diagramme montrant les variations le long de l'axe 15 du champ magnétique H. produit par la bobine 29 de déflexion verticale.FIG. 3 is a diagram showing the variations along the axis 15 of the magnetic field H. produced by the coil 29 of vertical deflection.

La courbe 37 en trait plein correspond au champ magnétique en l'absence de l'écran 35. Le centre 32 de déflexion verticale est la projection sur l'axe 15 du centre de gravité de la surface délimitée par cette courbe 37 et l'axe 15.The curve 37 in solid lines corresponds to the magnetic field in the absence of the screen 35. The center 32 of vertical deflection is the projection on the axis 15 of the center of gravity of the surface delimited by this curve 37 and the axis 15.

Lorsqu'on dispose l'écran 35 comme représenté sur la figure 2, la partie arrière 38 de la courbe 37 est déplacée vers l'avant (c'est-à-dire vers l'écran) et devient la courbe 39 en traits interrompus. Dans ces conditions le centre de déviation verticale est déplacé vers l'avant.When the screen 35 is arranged as shown in FIG. 2, the rear part 38 of the curve 37 is moved forward (that is to say towards the screen) and becomes curve 39 in broken lines . Under these conditions the center of vertical deflection is moved forward.

La figure 4 est un diagramme analogue à celui de la figure 3 mais montrant les variations le long de l'axe 15 du champ magnétique Ho produit par la bobine 24 de déviation horizontale. La courbe 40 en trait plein correspond à l'absence d'écran magnétique 35. Dans ce cas le centre de déviation horizontale du déviateur 20 est au point 31. Lorsque l'écran magnétique 35 est installé, la partie arrière 41 de la courbe 40 se déplace vers l'arrière, devenant ainsi la courbe 42 en traits interrompus. Dans ces conditions, le centre de déviation horizontale se déplace en 33 vers l'arrière.Figure 4 is a diagram similar to that of Figure 3 but showing the variations along the axis 15 of the magnetic field H o produced by the coil 24 of horizontal deflection. The curve 40 in solid lines corresponds to the absence of magnetic screen 35. In this case the center of horizontal deflection of the deflector 20 is at point 31. When the magnetic screen 35 is installed, the rear part 41 of the curve 40 moves backwards, thus becoming curve 42 in broken lines. Under these conditions, the center of horizontal deviation moves at 33 backwards.

La figure 5 est un schéma montrant la bobine de déviation verticale 29 avec les lignes de champ que produit cette dernière dans le plan horizontal (plan ZX). On voit que les lignes de champ au voisinage de l'écran magnétique 35 et de la partie arrière 36 de la bobine 29 en forme de tore sont déviées de leur trajectoire initiale 43 et déplacées vers l'avant (en 43') en raison de l'effet de miroir que produit cet écran magnétique 35, ce qui explique le déplacement du centre de déviation verticale (figure 3).FIG. 5 is a diagram showing the vertical deflection coil 29 with the field lines produced by the latter in the horizontal plane (plane ZX). It can be seen that the field lines in the vicinity of the magnetic screen 35 and of the rear part 36 of the coil 29 in the shape of a torus are deviated from their initial trajectory 43 and moved forward (at 43 ′) due to the mirror effect produced by this magnetic screen 35, which explains the displacement of the center of vertical deviation (FIG. 3).

La figure 6 est un schéma analogue à celui de la figure 5, mais pour la bobine 24 de déviation horizontale. Dans ce cas, les lignes de champ 44 à l'arrière de l'écran magnétique 35 sont repoussées encore plus vers l'arrière, ce qui explique le passage de la courbe 41 à la courbe 42 sur la figure 4 et le déplacement du centre de déviation horizontale lorsqu'on introduit ledit écran 35 entre le chignon 27 et la partie arrière 36 de la bobine 29.Figure 6 is a diagram similar to that of Figure 5, but for the coil 24 of horizontal deflection. In this case, the field lines 44 at the rear of the magnetic screen 35 are pushed back even more, which explains the passage from curve 41 to curve 42 in FIG. 4 and the displacement of the center. horizontal deflection when said screen 35 is introduced between the bun 27 and the rear part 36 of the coil 29.

Il est important de noter que la qualité de l'image obtenue sur l'écran du tube dépend de la forme, des dimensions et de la position de l'écran magnétique 35. En d'autres termes avec l'écran 35 on dispose d'un moyen de réglage supplémentaire du tube. Ce réglage est obtenu par modification de la position et/ou des dimensions et/ou de la forme de l'écran 35. On remarquera aussi que l'écran 35 augmente la déflexion horizontale et diminue la déflexion verticale. Il en résulte que l'énergie d'alimentation de la bobine de déflexion horizontale est plus faible alors que l'énergie d'alimentation de la bobine de déviation verticale est plus importante.It is important to note that the quality of the image obtained on the screen of the tube depends on the shape, the dimensions and the position of the magnetic screen 35. In other words with the screen 35 we have available '' a means of additional adjustment of the tube. This adjustment is obtained by modifying the position and / or the dimensions and / or the shape of the screen 35. It will also be noted that the screen 35 increases the horizontal deflection and decreases the vertical deflection. As a result, the supply energy of the horizontal deflection coil is lower while the supply energy of the vertical deflection coil is greater.

Dans l'exemple de la figure 7, l'écran magnétique 35 est en deux parties constituant les deux moitiés d'une couronne s'étendant dans un plan perpendiculaire à l'axe 15, pratiquement tout autour de cet axe.In the example of FIG. 7, the magnetic screen 35 is in two parts constituting the two halves of a crown extending in a plane perpendicular to the axis 15, practically all around this axis.

Dans cet exemple, comme en soi connu, le déviateur présente une carcasse en matière plastique 50 à trou cylindrique central pour le passage du col 21 et à l'intérieur duquel se trouve la partie principale 25 du bobinage 24 de déviation horizontale. Autour de cette carcasse est disposé le bobinage de déviation verticale. Le chignon arrière 27 est appliqué contre la face arrière 51 d'une couronne, ou flasque d'extrémité 52 de la carcasse 50. La bobine 29 (non visible sur la figure 7) est de l'autre côté, par rapport au chignon 27, de cette couronne 52. L'éecran magnétique 35 est disposé entre le chignon 27 et la face arrière 51 de la couronne 52. Sa séparation en deux parties est destinée à permettre son montage.In this example, as known per se, the deflector has a plastic carcass 50 with central cylindrical hole for the passage of the neck 21 and inside which is the main part 25 of the horizontal deflection winding 24. Around this carcass is arranged the vertical deflection winding. The rear bun 27 is applied against the rear face 51 of a crown, or end flange 52 of the carcass 50. The coil 29 (not visible in the figure 7) is on the other side, relative to the bun 27, of this crown 52. The magnetic screen 35 is disposed between the bun 27 and the rear face 51 of the crown 52. Its separation into two parts is intended to allow its mounting.

Dans l'exemple de la figure 8, l'écran magnétique 35 est formé de quatre segments 351, 352, 353 et 354 d'un couronne, qui sont répartis régulièrement autour de l'axe 15, chaque segment étant conformé et disposé de façon telle que la bissectrice du quadrant qu'il occupe constitue un axe de symétrie pour ce segment.In the example of FIG. 8, the magnetic screen 35 is formed of four segments 35 1 , 35 2 , 35 3 and 35 4 of a crown, which are distributed regularly around the axis 15, each segment being shaped and arranged in such a way that the bisector of the quadrant that it occupies constitutes an axis of symmetry for this segment.

Dans l'exemple de la figure 9, la bobine de déviation horizontale 24a est identiqué à la bobine 24 de la figure 2. Par contre la bobine de déviation verticale 54 est, comme la bobine 24a en forme de selle. Cette bobine 54 est plus courte que la bobine 24a; elle entoure cette dernière et elle présente des chignons avant 55 et arrière 56 s'étendant perpendiculairement à l'axe du tube. L'écran magnétique 35a est disposé entre le chignon arrière 27a de la bobine 24a et le chignon arrière 56 de la bobine 54. Un noyau en ferrite 57 est disposé entre les chignons 55 et 56 autour de la partie centrale de la bobine 54.In the example of FIG. 9, the horizontal deflection coil 24a is identified with the coil 24 of FIG. 2. On the other hand, the vertical deflection coil 54 is, like the saddle-shaped coil 24a. This coil 54 is shorter than the coil 24a; it surrounds the latter and it has front buns 55 and rear 56 extending perpendicular to the axis of the tube. The magnetic screen 35a is disposed between the rear bun 27a of the coil 24a and the rear bun 56 of the coil 54. A ferrite core 57 is disposed between the buns 55 and 56 around the central part of the coil 54.

Dans l'exemple de la figure 10, l'écran magnétique 35b présente une partie 60 perpendiculaire à l'axe 15 et une extension 61 vers l'arrière, c'est-à-dire vers les canons, et de direction oblique. Cette extension augmente, dans une plus grande mesure que la simple couronne 35 ou 35a, le champ de déviation horizontale à l'arrière du déviateur.In the example of FIG. 10, the magnetic screen 35 b has a part 60 perpendicular to the axis 15 and an extension 61 towards the rear, that is to say towards the barrels, and in an oblique direction. This extension increases, to a greater extent than the simple crown 35 or 35a, the horizontal deflection field at the rear of the deflector.

Claims (11)

1. A method for the transformation of a deflection system (20) for a color image forming tube (23) of the autoconvergent type having three electron guns producing beams in the same plane, said method being intended for the use of the deflection system with a tube whose screen (30') has reduced dimensions but is otherwise identical with the that for which the said deflection system was initially provided, in which method the distance separating the center (31) of horizontal deflection from the center (32) of vertical deflection is modified, characterized in that a magnetic screen (35, 35a and 35b) is placed across the lines of the magnetic fields produced by the coils for vertical (29) and horizontal (24) deflection in such a manner as to obtain the said distance separating the centers of deflections without modification or displacement of the coil means.
2. The method as claimed in claim 1, characterized in that the magnetic screen is placed in such a manner that it augments the horizontal deflection and diminishes the vertical deflection.
3. The method as claimed in claim 2, characterized in that the coil (24) for horizontal deflection is in the form of a saddle with arcuate parts perpendicular to the axis of the tube, and the magnetic screen (35, 35a and 35b) is placed between the rear arcuate part (27 and 27a) and the rear (36 and 56) of the coil (29 and 54) for vertical deflection.
4. The method as claimed in claim 3, characterized in that in an inherently known manner the vertical deflection coil (29) is in the form of a torus.
5. The method as claimed in claim 3, characterized in that in an inherently known manner the vertical deflection coil (54) is in the form of a saddle with arcuate parts perpendicular to the axis of the tube, the screen (35a) being thus disposed between the rear arcuate parts (56 and 27a) of the vertical deflection coils (54) and of the horizontal ones (24a).
6. The method as claimed in any one of the preceding claims, characterized in that the magnetic screen (35) is so placed as to shift the center (32) of vertical deflection towards the front and to shift the center (31) of horizontal deflection towards the rear of the tube.
7. The method as claimed in any one of the preceding claims, characterized in that the magnetic screen (35) comprises two parts constituting the two halves of a circular ring.
8. The method as claimed in any one of the preceding claims 1 through 6, characterized in that the magnetic screen comprises a plurality of sectors (351, 352, 353 and 354) of a ring.
9. The method as claimed in claim 7 or claim 8, characterized in that the ring extends in a plane which is perpendicular to the axis (15) of the tube.
10. The method as claimed in claim 7 or claim 8, characterized in that the ring extends in a plane which is perpendicular to the axis (15) of the tube.
11. The method as claimed in claim 3, characterized in that the transformed deflector is submitted to a regulating operation in which the form and/or the dimensions and/or the position of the magnetic screen are adjusted.
EP83401888A 1982-10-05 1983-09-27 Transforming method of a deflection unit permitting its use in autoconvergent imaging tubes of different dimensions, and deflection unit so obtained Expired - Lifetime EP0107987B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83401888T ATE23763T1 (en) 1982-10-05 1983-09-27 METHOD OF MODIFICATION OF A DEFLECTION UNIT THAT ALLOWS ITS USE IN AUTOCONVERGING PICTURE TUBES OF VARIOUS SIZES AND DEFLECTION UNIT THUS OBTAINED.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8216680A FR2534065A1 (en) 1982-10-05 1982-10-05 PROCESS FOR TRANSFORMING A DEVIATOR FOR ITS USE FOR TUBES WITH SELF-CONTAINING IMAGES OF DIFFERENT DIMENSIONS AND DEVIATOR THUS OBTAINED
FR8216680 1982-10-05

Publications (3)

Publication Number Publication Date
EP0107987A1 EP0107987A1 (en) 1984-05-09
EP0107987B1 EP0107987B1 (en) 1986-11-20
EP0107987B2 true EP0107987B2 (en) 1990-03-14

Family

ID=9277990

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401888A Expired - Lifetime EP0107987B2 (en) 1982-10-05 1983-09-27 Transforming method of a deflection unit permitting its use in autoconvergent imaging tubes of different dimensions, and deflection unit so obtained

Country Status (9)

Country Link
US (1) US4538128A (en)
EP (1) EP0107987B2 (en)
JP (1) JPS5987740A (en)
AT (1) ATE23763T1 (en)
DE (1) DE3367821D1 (en)
FR (1) FR2534065A1 (en)
HK (1) HK16890A (en)
PT (1) PT77365B (en)
SG (1) SG66789G (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3439808A1 (en) * 1984-10-31 1986-04-30 Standard Elektrik Lorenz Ag, 7000 Stuttgart DEFLECTION SYSTEM FOR COLORED TUBES
CA1269694A (en) * 1985-07-31 1990-05-29 Paul Michael Bruey Deflection distortion correction device
US4823100A (en) * 1985-07-31 1989-04-18 Rca Licensing Corporation Deflection distortion correction device
NL8600833A (en) * 1986-04-02 1987-11-02 Philips Nv CATHED BEAM TUBE.
DE3706015A1 (en) * 1987-02-25 1988-11-17 Henkel Kgaa LIQUID DETERGENT

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2602902A (en) * 1950-02-14 1952-07-08 Bendix Aviat Corp Sweep amplitude control for magnetically deflected cathode-ray tubes
US2763804A (en) * 1953-12-01 1956-09-18 Rca Corp Cathode ray tube device
JPS4822364B1 (en) * 1968-10-09 1973-07-05
JPS568056B2 (en) * 1972-11-08 1981-02-21
JPS5224530A (en) * 1975-07-01 1977-02-24 Matsushita Electric Ind Co Ltd Image formation method
NL188484C (en) * 1978-02-06 1992-07-01 Philips Nv DEFLECTOR FOR COLOR TELEVISION IMAGE TUBES.
NL188373C (en) * 1978-02-06 1992-06-01 Philips Nv DEFLECTOR FOR COLOR TELEVISION IMAGE TUBES.
JPS54131795A (en) * 1978-04-01 1979-10-13 Akira Nakano Apparatus for twisting naked and of distributing wire material
NL174198C (en) * 1978-08-25 1984-05-01 Philips Nv SERIES OF AT LEAST TWO PICTURE TUBE / DEFLECTOR COMBINATIONS, DEFLECTION UNIT INTENDED FOR SUCH COMBINATION, AND METHOD FOR MANUFACTURING SUCH DEFLECTION.
US4231009A (en) * 1978-08-30 1980-10-28 Rca Corporation Deflection yoke with a magnet for reducing sensitivity of convergence to yoke position
JPS5831697B2 (en) * 1979-03-12 1983-07-07 株式会社日立製作所 deflection yoke
NL7908000A (en) * 1979-11-01 1981-06-01 Philips Nv DEFLECTION Yoke.
JPS573352A (en) * 1980-06-06 1982-01-08 Denki Onkyo Co Ltd Deflection yoke

Also Published As

Publication number Publication date
EP0107987B1 (en) 1986-11-20
FR2534065B1 (en) 1985-02-08
US4538128A (en) 1985-08-27
PT77365B (en) 1986-03-11
PT77365A (en) 1983-10-01
EP0107987A1 (en) 1984-05-09
JPS5987740A (en) 1984-05-21
ATE23763T1 (en) 1986-12-15
SG66789G (en) 1990-01-26
HK16890A (en) 1990-03-09
DE3367821D1 (en) 1987-01-08
FR2534065A1 (en) 1984-04-06

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