EP0225245A1 - Device for correcting the deviation due to the variation in the focusing voltage in an in-line cathode ray tube - Google Patents

Device for correcting the deviation due to the variation in the focusing voltage in an in-line cathode ray tube Download PDF

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Publication number
EP0225245A1
EP0225245A1 EP86402537A EP86402537A EP0225245A1 EP 0225245 A1 EP0225245 A1 EP 0225245A1 EP 86402537 A EP86402537 A EP 86402537A EP 86402537 A EP86402537 A EP 86402537A EP 0225245 A1 EP0225245 A1 EP 0225245A1
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EP
European Patent Office
Prior art keywords
grid
holes
difference
thickness
variation
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Granted
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EP86402537A
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German (de)
French (fr)
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EP0225245B1 (en
Inventor
Gérard Proudhon
Jacques Baudry
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Videocolor SA
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Videocolor SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4844—Electron guns characterised by beam passing apertures or combinations
    • H01J2229/4848—Aperture shape as viewed along beam axis
    • H01J2229/4858—Aperture shape as viewed along beam axis parallelogram
    • H01J2229/4865—Aperture shape as viewed along beam axis parallelogram rectangle
    • H01J2229/4868—Aperture shape as viewed along beam axis parallelogram rectangle with rounded end or ends
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4844—Electron guns characterised by beam passing apertures or combinations
    • H01J2229/4848—Aperture shape as viewed along beam axis
    • H01J2229/4872—Aperture shape as viewed along beam axis circular

Definitions

  • the present invention relates to a device for correcting the deflection effect due to a variation in the focusing voltage in a trichrome cathode-ray tube with inline cathodes.
  • the present invention relates to a device for correcting the aforementioned effect, not requiring modification of G2, which remains flat, a device which is simple and inexpensive to implement.
  • the device according to the invention for a trichromatic cathode ray tube with aligned cathodes, is a barrel whose ⁇ extreme holes of the fourth grid, generally corresponding to the colors red and blue, have differences in characteristics, compared to their centers of 'origin, between their peripheral portions facing the central hole (corresponding to green) and the rest of their periphery.
  • This difference in characteristics may be a difference in shape, or in thickness, or in level with respect to the general plane of the grid.
  • the invention relates to trichrome cathode-ray tubes of the cannon type comprising a pre-focusing lens (grids 1 to 4 generally) and a main focusing lens (grids 5, and 6 if necessary, generally), and three emissive cathodes arranged online.
  • the present invention provides for modifying the fourth grid G4, and not the second G2, which remains flat, without modifications to compensate for this phenomenon.
  • the Applicant has found that modifications of the G4 grid were easier to implement and less likely to adversely influence its usual properties than was the case for modifications of G2.
  • this fourth grid, referenced 1, of oblong shape originally has three circular holes 2, 3, 4 aligned and equidistant, for the passage of the electron beams responsible for illuminating the red phosphors , green and blue, respectively, of the trichrome cathode ray tube of which this grid 1 is a part.
  • the holes 2 and 4 are enlarged in the direction of the longitudinal axis of the grid 1, in the direction of its ends, so as to obtain oblong holes 5, 6 corresponding to a "translation" over a distance d, along said longitudinal axis, holes 2 and 4 respectively.
  • this distance d must generally be between 0.1 and 0.2 mm approximately to allow this phenomenon to be compensated correctly.
  • the value of d is approximately 0.13 mm.
  • this distance d is determined after two tests, for example a test at 0.10 mm and another at 0.20 mm, the value of the optimal distance being obtained by linear interpolation or extrapolation. If the value thus calculated was outside the chosen range, a third confirmation test could be carried out with a distance d equal to the value calculated by extrapolation.
  • a fourth grid 7 of usual shape comprising the three usual holes 8, 9, 10.
  • the plate 11 and the grid 7 can be made with the same material and have approximately the same thickness.
  • the plate 11 being centered relative to the grid 7, a central hole is counter-drilled in the plate 11 as an extension of the hole 9, and two half-holes as an extension of the holes 8 and 10.
  • the fine adjustment of the action of the plate 11 can be made by varying the length and / or its thickness.
  • the grid 12 shown in FIG. 3 is, at the start, a grid of the usual shape, of which there are a bend towards the cathode, the rounded ends 16, 17, the bending being made substantially at the centers of the end holes 13 , 15.
  • the fine adjustment of the correction provided by the grid 12 is effected by varying the amplitude of the counter-bending, which is approximately equal to the thickness of the grid 12.
  • the optimal values of the parameters are obtained (dimensions of the grid 11 or amplitude of the reverse bending of the grid 12) by linear interpolation or extrapolation from two substantially different values close to the average value indicated above.

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  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Abstract

Pour éviter le phénomène de déviation des spots rouge et bleu d'un tube trichrome à cathodes en ligne, en fonction de variation de la tension de focalisation, on agrandit les trous (5, 6) correspondant à ces deux couleurs, sur une distance d d'environ 0,1 à 0,2 mm.To avoid the phenomenon of deviation of the red and blue spots of a trichrome tube with cathodes in line, as a function of variation of the focusing voltage, the holes (5, 6) corresponding to these two colors are enlarged, over a distance d from about 0.1 to 0.2 mm.

Description

La présente invention a pour objet un dispositif de correction de l'effet de déviation dû à une variation de la tension de focali­sation dans un tube cathodique trichrome à cathodes en ligne.The present invention relates to a device for correcting the deflection effect due to a variation in the focusing voltage in a trichrome cathode-ray tube with inline cathodes.

On a constaté que dans les tubes cathodiques trichromes, du type à canon comportant une lentille de préfocalisation et une lentille principale, c'est-à-dire se composant au total de cinq ou six grilles en général, lorsque l'on fait varier la tension de focalisation, en passant par exemple de 8 à 10 kV, on modifie la position des spots correspondant aux couleurs rouge et bleue, pour l'illumination des mêmes luminophores. Ce phénomène a été constaté lors de tests d'alignement du canon (connus sous l'appellation FRAT, c'est-à-dire Focus Raster Alignment Test). Cette modification de la position des spots a une action défavorable sur la convergence.It has been found that in trichrome cathode ray tubes, of the barrel type comprising a pre-focusing lens and a main lens, that is to say consisting of a total of five or six grids in general, when the variation is varied. focusing voltage, passing for example from 8 to 10 kV, the position of the spots corresponding to the red and blue colors is modified, for the illumination of the same phosphors. This phenomenon was noted during barrel alignment tests (known under the name FRAT, that is to say Focus Raster Alignment Test). This modification of the position of the spots has an unfavorable action on the convergence.

Pour remédier à cet effet, on modifie la forme de la grille 2, que l'on appelle alors "G2 avec FRAT fixe", en emboutissant sa partie centrale. Cet emboutissage provoque une déformation inévi­table des surfaces planes de la grille agissant défavorablement sur l'astigmatisme du tube, ce qui nécessite d'augmenter la tension de focalisation nécessaire pour compenser ce phénomène.To remedy this effect, the shape of the grid 2, which is then called "G2 with fixed FRAT", is modified by stamping its central part. This drawing causes an inevitable deformation of the plane surfaces of the grid acting adversely on the astigmatism of the tube, which requires increasing the focusing voltage necessary to compensate for this phenomenon.

La présente invention a pour objet un dispositif de correction de l'effet précité, ne nécessitant pas de modification de G2, qui reste plane, dispositif qui soit simple et peu onéreux à mettre en oeuvre.The present invention relates to a device for correcting the aforementioned effect, not requiring modification of G2, which remains flat, a device which is simple and inexpensive to implement.

Le dispositif conforme à l'invention, pour un tube cathodique trichrome à cathodes alignées, est un canon dont les `trous extrêmes de la quatrième grille, correspondant généralement aux couleurs rouge et bleue, présentent des différences de caractéristiques, par rapport à leurs centres d'origine, entre leurs portions périphériques en vis-à-vis du trou central (correspondant au vert) et le reste de leur périphérie.The device according to the invention, for a trichromatic cathode ray tube with aligned cathodes, is a barrel whose `extreme holes of the fourth grid, generally corresponding to the colors red and blue, have differences in characteristics, compared to their centers of 'origin, between their peripheral portions facing the central hole (corresponding to green) and the rest of their periphery.

Cette différence de caractéristiques peut être une différence de formes, ou d'épaisseur, ou de niveau par rapport au plan général de la grille.This difference in characteristics may be a difference in shape, or in thickness, or in level with respect to the general plane of the grid.

La présente invention sera mieux comprise à la lecture de la description détaillée de plusieurs modes de réalisation et illustrée par le dessin annexé, sur lequel:

  • - la figure 1 est une vue en plan d'un mode de réalisation préféré de G4 conformément à l'invention, et
  • - les figures 2 et 3 sont des vues en coupe de deux autres modes de réalisation de G4 conformément à l'invention.
The present invention will be better understood on reading the detailed description of several embodiments and illustrated by the appended drawing, in which:
  • FIG. 1 is a plan view of a preferred embodiment of G4 according to the invention, and
  • - Figures 2 and 3 are sectional views of two other embodiments of G4 according to the invention.

L'invention se rapporte à des tubes cathodiques trichromes du type à canon comportant une lentille de préfocalisation (grilles 1 à 4 généralement) et une lentille principale de focalisation (grilles 5, et 6 le cas échéant, généralement), et trois cathodes émissives dispo­sées en ligne.The invention relates to trichrome cathode-ray tubes of the cannon type comprising a pre-focusing lens (grids 1 to 4 generally) and a main focusing lens (grids 5, and 6 if necessary, generally), and three emissive cathodes arranged online.

Pour compenser le phénomène précité observé lors de tests FRAT, la présente invention prévoit de modifier la quatrième grille G4, et non la seconde G2, qui reste plane, sans modifications de compensation de ce phénomène. La Demanderesse a constaté que des modifications de la grille G4 étaient plus faciles à mettre en oeuvre et risquaient moins d'influencer défavorablement ses pro­priétés habituelles que ce n'était le cas pour des modifications de G2.To compensate for the aforementioned phenomenon observed during FRAT tests, the present invention provides for modifying the fourth grid G4, and not the second G2, which remains flat, without modifications to compensate for this phenomenon. The Applicant has found that modifications of the G4 grid were easier to implement and less likely to adversely influence its usual properties than was the case for modifications of G2.

Dans les trois modes de réalisation de l'invention représentés sur le dessin, on part d'une grille G4 de forme classique. Comme représenté par exemple sur la figure 1, cette quatrième grille, référencée 1, de forme oblongue, comporte à l'origine trois trous circulaires 2, 3, 4 alignés et équidistants, pour le passage des faisceaux électroniques chargés d'illuminer les luminophores rouges, verts et bleus, respectivement, du tube cathodique trichrome dont fait partie cette grille 1.In the three embodiments of the invention shown in the drawing, we start from a grid G4 of conventional shape. As shown for example in FIG. 1, this fourth grid, referenced 1, of oblong shape, originally has three circular holes 2, 3, 4 aligned and equidistant, for the passage of the electron beams responsible for illuminating the red phosphors , green and blue, respectively, of the trichrome cathode ray tube of which this grid 1 is a part.

Sur la figure 1, les trous exrêmes 2 et 4, circulaires à l'origine, ont été représentés en traits interrompus dans leurs portions extrêmes, c'est-à-dire leurs parties semi-circulaires les plus éloignées du trou central 3.In FIG. 1, the extreme holes 2 and 4, originally circular, have been shown in broken lines in their extreme portions, that is to say their most semicircular parts. away from the central hole 3.

Selon l'invention, on agrandit les trous 2 et 4 dans le sens de l'axe longitudinal de la grille 1, en direction de ses extrémités, de façon à obtenir des trous oblongs 5, 6 correspondant à une "trans­lation" sur une distance d, selon ledit axe longitudinal, des trous 2 et 4 respectivement. On a constaté que pour différents tubes catho­diques, et pour une tension de focalisation comprise entre 8 et 10 kV environ, cette distance d devait être généralement comprise entre 0,1 et 0,2 mm environ pour permettre de compenser correctement ledit phénomène. Selon un mode de réalisation préféré, pour un canon à six grilles de focalisation, et une tension de focalisation de 8 kV environ, la valeur de d est de 0,13 mm environ. Dans la pratique, on détermine cette distance d à la suite de deux essais, par exemple un essai à 0,10 mm et un autre à 0,20 mm, la valeur de la distance optimale étant obtenue par interpolation ou extrapolation linéaire. Si la valeur ainsi calculée se trouvait en dehors de la fourchette choisie, on pourrait effectuer un troisième essai de confirmation avec une distance d égale à la valeur calculée par extrapolation.According to the invention, the holes 2 and 4 are enlarged in the direction of the longitudinal axis of the grid 1, in the direction of its ends, so as to obtain oblong holes 5, 6 corresponding to a "translation" over a distance d, along said longitudinal axis, holes 2 and 4 respectively. It has been found that for different cathode ray tubes, and for a focusing voltage of between 8 and 10 kV approximately, this distance d must generally be between 0.1 and 0.2 mm approximately to allow this phenomenon to be compensated correctly. According to a preferred embodiment, for a cannon with six focusing grids, and a focusing voltage of approximately 8 kV, the value of d is approximately 0.13 mm. In practice, this distance d is determined after two tests, for example a test at 0.10 mm and another at 0.20 mm, the value of the optimal distance being obtained by linear interpolation or extrapolation. If the value thus calculated was outside the chosen range, a third confirmation test could be carried out with a distance d equal to the value calculated by extrapolation.

Selon le mode de réalisation de la figure 2, on part d'une quatrième grille 7 de forme habituelle, comportant les trois trous 8, 9, 10 habituels. On fixe, par tout moyen approprié, sur la face inférieure (c'est-à-dire celle tournée vers la cathode) de la grille 7 une plaque 11 rectangulaire de largeur égale à celle de la grille 7, et de longueur à peu près égale à l'entraxe des trous 8, 10 (ceux correspondant au rouge et au bleu). La plaque 11 et la grille 7 peuvent être réalisées avec le même matériau et avoir à peu près la même épaisseur. La plaque 11 étant centrée par rapport à la grille 7, on contre-perce dans la plaque 11 un trou central en prolon­gement du trou 9, et deux demi-trous en prolongement des trous 8 et 10. Le réglage fin de l'action de la plaque 11 peut être effectué en jouant sur la longueur et/ou son épaisseur. Bien entendu, au lieu de rajouter une plaque telle que la plaque 11, on peut partir d'une grille de plus grande épaisseur et diminuer l'épaisseur de ses extrémités.According to the embodiment of Figure 2, we start from a fourth grid 7 of usual shape, comprising the three usual holes 8, 9, 10. Is fixed, by any suitable means, on the underside (that is to say that facing the cathode) of the grid 7 a rectangular plate 11 of width equal to that of the grid 7, and of length approximately equal to the distance between holes 8, 10 (those corresponding to red and blue). The plate 11 and the grid 7 can be made with the same material and have approximately the same thickness. The plate 11 being centered relative to the grid 7, a central hole is counter-drilled in the plate 11 as an extension of the hole 9, and two half-holes as an extension of the holes 8 and 10. The fine adjustment of the action of the plate 11 can be made by varying the length and / or its thickness. Of course, instead of adding a plate such as the plate 11, it is possible to start from a grid of greater thickness and reduce the thickness of its ends.

La grille 12 représentée sur la figure 3 est, au départ, une grille de forme habituelle dont on contre-coude, vers la cathode, les extrémités arrondies 16, 17, le contre-coudage étant fait sensi­blement au niveau des centres des trous extrêmes 13, 15. Le réglage fin de la correction apportée par la grille 12 se fait en jouant sur l'amplitude du contre-coudage, qui est à peu près égale à l'épaisseur de la grille 12.The grid 12 shown in FIG. 3 is, at the start, a grid of the usual shape, of which there are a bend towards the cathode, the rounded ends 16, 17, the bending being made substantially at the centers of the end holes 13 , 15. The fine adjustment of the correction provided by the grid 12 is effected by varying the amplitude of the counter-bending, which is approximately equal to the thickness of the grid 12.

Pour les deux modes de réalisation des figures 2 et 3, on obtient les valeurs optimales des paramètres (dimensions de la grille 11 ou amplitude du contre-coudage de la grille 12) par interpolation ou extrapolation linéaire à partir de deux valeurs sensiblement différentes voisines de la valeur moyenne indiquée ci-dessus.For the two embodiments of FIGS. 2 and 3, the optimal values of the parameters are obtained (dimensions of the grid 11 or amplitude of the reverse bending of the grid 12) by linear interpolation or extrapolation from two substantially different values close to the average value indicated above.

Claims (9)

1. Dispositif de correction de l'effet de déviation dû à une variation de la tension de focalisation dans un tube cathodique trichrome à cathode en lignes, du type comportant cinq ou six grilles de focalisation, avec une deuxième grille plane et une quatrième grille oblongue comportant trois trous circulaires alignés, caractérisé par le fait que les trous extrêmes (2, 4 -8, 10 - 13, 15) de la quatrième grille (1, 7, 12) présentent des différences de caracté­ristiques entre leurs portions périphériques faisant face ou trou central de la grille et le reste de leur périphérie, par rapport à leur centre d'origine (5, 6 - 11 - 16, 17).1. Device for correcting the deflection effect due to a variation in the focusing voltage in a trichrome cathode-ray tube with a line cathode, of the type comprising five or six focusing grids, with a second plane grid and a fourth oblong grid comprising three aligned circular holes, characterized in that the end holes (2, 4 -8, 10 - 13, 15) of the fourth grid (1, 7, 12) have differences in characteristics between their peripheral portions facing or central hole of the grid and the rest of their periphery, relative to their center of origin (5, 6 - 11 - 16, 17). 2. Dispositif de correction selon la revendication 1, caracté­risé par le fait que la différence de caractéristiques est une différence de formes.2. Correction device according to claim 1, characterized in that the difference in characteristics is a difference in shape. 3. Dispositif selon la revendication 2, caractérisé par le fait que les trous extrêmes (2, 4) sont agrandis dans le sens de l'axe longitudinal de la grille, en direction de ses extrémités, de façon à obtenir des trous oblongs (5, 6).3. Device according to claim 2, characterized in that the extreme holes (2, 4) are enlarged in the direction of the longitudinal axis of the grid, in the direction of its ends, so as to obtain oblong holes (5 , 6). 4. Dispositif selon la revendication 3, caractérisé par le fait que l'on agrandit les trous extrêmes sur une profondeur (d) comprise entre 0,1 et 0,2 mm environ.4. Device according to claim 3, characterized in that the extreme holes are enlarged to a depth (d) of between 0.1 and 0.2 mm approximately. 5. Dispositif selon la revendication 1, caractérisé par le fait que la différence de caractéristiques est une différence d'épaisseur (11).5. Device according to claim 1, characterized in that the difference in characteristics is a difference in thickness (11). 6. Dispositif selon la revendication 5, caractérisé par le fait que la différence d'épaisseur est obtenue en fixant sur la partie centrale de la grille une plaque (11) de même largeur que celle de la grille et dont la longueur est sensiblement égale à l'entraxe des trous extrêmes, des trous étant contre-percés dans cette plaque, en prolongement des trous (8, 9, 10) de la grille.6. Device according to claim 5, characterized in that the difference in thickness is obtained by fixing on the central part of the grid a plate (11) of the same width as that of the grid and whose length is substantially equal to the center distance of the extreme holes, holes being counter-drilled in this plate, as an extension of the holes (8, 9, 10) of the grid. 7. Dispositif selon la revendication 5, caractérisé par le fait que la différence d'épaisseur est obtenue par diminution d'épaisseur des extrémités de la grille.7. Device according to claim 5, characterized in that the difference in thickness is obtained by reduction in thickness of the ends of the grid. 8. Dispositif selon la revendication 1, caractérisé par le fait que la différence de caractéristiques est une différence de niveau par rapport au plan général de la grille (16, 17).8. Device according to claim 1, characterized in that the difference in characteristics is a difference in level with respect to the general plane of the grid (16, 17). 9. Dispositif selon la revendication 8, caractérisé par le fait que la différence de niveau est obtenue par contre-coudage des extrémités arrondies de la grille (16, 17), sensiblement à la hauteur des centres des trous extrêmes de la grille.9. Device according to claim 8, characterized in that the difference in level is obtained by counter-bending the rounded ends of the grid (16, 17), substantially at the height of the centers of the end holes of the grid.
EP86402537A 1985-11-22 1986-11-14 Device for correcting the deviation due to the variation in the focusing voltage in an in-line cathode ray tube Expired - Lifetime EP0225245B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8517333A FR2590724B1 (en) 1985-11-22 1985-11-22 DEVICE FOR CORRECTING THE DEVIATION EFFECT DUE TO A VARIATION OF THE FOCUSING VOLTAGE IN A TRICHROME CATHODE TUBE WITH ONLINE CATHODES
FR8517333 1985-11-22

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EP0225245A1 true EP0225245A1 (en) 1987-06-10
EP0225245B1 EP0225245B1 (en) 1990-09-05

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US (1) US4812706A (en)
EP (1) EP0225245B1 (en)
JP (1) JP2598001B2 (en)
DE (1) DE3673962D1 (en)
FR (1) FR2590724B1 (en)
HK (1) HK156995A (en)
IN (1) IN166317B (en)

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Publication number Priority date Publication date Assignee Title
EP0301648A2 (en) * 1987-07-29 1989-02-01 Koninklijke Philips Electronics N.V. Colour cathode ray tube having an in-line electron gun
US4940917A (en) * 1987-07-29 1990-07-10 U.S. Philips Corporation Color cathode ray tube having an in-line electron gun
EP0301648A3 (en) * 1987-07-29 1991-02-13 Koninklijke Philips Electronics N.V. Colour cathode ray tube having an in-line electron gun
US5202604A (en) * 1990-05-08 1993-04-13 Samsung Electron Devices Co., Ltd. Electron gun for cathode ray tube
EP0489432A1 (en) * 1990-12-05 1992-06-10 Goldstar Co. Ltd. Electron gun for color cathode-ray tube
US5198719A (en) * 1990-12-05 1993-03-30 Goldstar Co., Ltd. Electron gun for color cathode-ray tube

Also Published As

Publication number Publication date
JPS62131448A (en) 1987-06-13
IN166317B (en) 1990-04-07
US4812706A (en) 1989-03-14
FR2590724A1 (en) 1987-05-29
FR2590724B1 (en) 1988-01-08
HK156995A (en) 1995-10-13
JP2598001B2 (en) 1997-04-09
DE3673962D1 (en) 1990-10-11
EP0225245B1 (en) 1990-09-05

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