EP0074891B1 - Apparatus for placing and fixing the static convergence correction unit to the neck of a colour television tube - Google Patents

Apparatus for placing and fixing the static convergence correction unit to the neck of a colour television tube Download PDF

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Publication number
EP0074891B1
EP0074891B1 EP82401633A EP82401633A EP0074891B1 EP 0074891 B1 EP0074891 B1 EP 0074891B1 EP 82401633 A EP82401633 A EP 82401633A EP 82401633 A EP82401633 A EP 82401633A EP 0074891 B1 EP0074891 B1 EP 0074891B1
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EP
European Patent Office
Prior art keywords
neck
tube
ring
collars
correction unit
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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.)
Expired
Application number
EP82401633A
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German (de)
French (fr)
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EP0074891A1 (en
Inventor
Adriano Venturi
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Videocolor SA
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Videocolor SA
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Publication of EP0074891A1 publication Critical patent/EP0074891A1/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
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements
    • H01J29/823—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements around the neck of the tube
    • H01J29/826—Deflection arrangements

Definitions

  • the present invention relates to a device for installing and fixing the static convergence correction unit on the neck of a color television tube.
  • This adjustment is ensured in a conventional manner by the static convergence correction unit which is constituted by several small magnets whose magnetic fields which interfere make it possible to carry out the desired adjustment.
  • This correction unit is usually placed just behind the tube deflection block. Its positioning on the tube, its precise positioning and the adjustment and maintenance operations associated therewith pose delicate problems which the invention makes it possible to solve in a simple and economical manner.
  • the static convergence correction unit could comprise various adjustable unit elements which were fixed, for example glued, behind the deflection block of the tube. Such a process is long, difficult to industrialize and does not allow adjustments to be made flexibly.
  • a ring usually made of a plastic material loaded with ferrite is placed behind the deflection block which can be magnetized in the most suitable way to obtain the desired static convergence corrections.
  • This ring can be split, and in this case, its attachment to the neck of the tube is ensured by tightening by means of an external metal collar.
  • the adjustment operations are not very easy because the magnetization of the ring cannot be done with the metal fixing collar in place.
  • the fact that the ring is split also introduces an air gap unfavorable for a good adjustment.
  • the ring of plastic material loaded with ferrite is not split, which eliminates the problem of the air gap.
  • this introduces a problem difficult to solve of precise positioning of this ring on the neck of the tube, taking into account the manufacturing tolerances in particular of the glass of the tube and of the relatively large and variable clearance existing between the walls of the neck of the tube and of the static convergence correction unit.
  • This axial play is unfavorable both at the level of the realization of the adjustment and at the level of the fixing of the ring on the neck of the tube.
  • patent BE-A-528,230 where the neck of the tube has two annular protuberances over which slides a sleeve carrying the concentration magnet. Mention may also be made of patent FR-A-2 306 522 in which the correction ring comprises an annular support of synthetic material outside of which the correction magnet is disposed.
  • the present invention relates to a device for installing and fixing the static convergence correction unit on the neck of a color television tube, of the type comprising a body interlayer between the neck of the tube and said static convergence correction unit, said correction unit essentially consisting of a closed cylindrical ring made of plastic loaded with ferrite, which ring has an inside diameter D 3 slightly greater than the outside diameter D 2 of the neck 1 of the tube which it must equip, characterized in that it comprises at least one and preferably two elastic collars 7, 8 made of heat-resistant elastomeric material such as silicone rubber which are arranged in extension around the neck of the tube and have a reduced thickness section, that is to say one to two millimeters, the said elastic collar (s) being compressed by the wall of said positioned unit on the collar over the said collar (s).
  • the desired magnetization of the static convergence correction unit is carried out when the latter is in place on the neck of the tube, which facilitates the operation and makes it easily industrializable.
  • the device according to the invention comprises a static convergence correction unit essentially composed of a closed plastic cylindrical ring loaded with ferrite of diameter less than slightly greater than the outside diameter of the neck of the tube which it must equip, at least one and preferably two elastic collars made of heat-resistant elastomeric material such as silicone rubber having in the rest state a diameter less than the outside diameter of the neck and a section of reduced thickness about one to two millimeters, said device, in the mounting position on the tube, comprising said unit positioned on the neck over said elastic collars compressed between the facing walls of said unit and said neck.
  • FIG. 1 we see the rear part or neck 1 of a color television tube 2 on which we just mounted in any known manner the deflection block 3 whose outer contour has been shown in dotted lines in the figure and of which we have identified in FIGS. 2 and 3 only the rear face 4 against which we have mounted the static convergence correction unit slightly in front of the barrels (not shown) located at inside of the collar at the rear end of the latter.
  • the letters AR mark the rear direction with respect to the front direction marked AV of the tube whose axis has been marked 5.
  • a closed cylindrical ring 6 known per se which can be seen in particular in FIGS. 2 and 4 is used as the static convergence correction unit.
  • This ring is advantageously made of a suitable quality plastic material loaded with ferrite, so that you can create the desired polar magnetic elements to obtain the desired magnetic static convergence correction.
  • two elastic rings or elastic collars of appropriate quality marked 7 and 8 are engaged on the neck 1, behind the deflection block 3, two elastic rings or elastic collars of appropriate quality marked 7 and 8 are engaged.
  • the dimensions of these rings are such that their diameter D 1 (FIG. 5) is state of rest significantly lower than the outside diameter D 2 of a tube neck.
  • D 1 of the collars 7 and 8 may be of the order of 13 to 26 millimeters.
  • the collars 7 and 8 are positioned on the neck 1 in extension and remain in place of themselves.
  • the mean diameter D 2 of the neck 1 of the tube is 29 millimeters
  • an average inner diameter of the ring 6 of 30 millimeters, which gives a diametral mean clearance of 1 millimeter making it possible to absorb the tolerances normal manufacturing.
  • a thickness d of the section of the collars of the order of 1.5 to 2 millimeters, so as to obtain sufficient crushing of these collars during the positioning of the correction unit. static convergences 6.
  • the manufacturing tolerances of the tubes are greater than a millimeter for the value of the diameter of the neck, it will be possible to provide a set of several correction rings 6 having diameters ranging from millimeter to millimeter and l 'We will adapt each time on the neck of the tube the ring of the most suitable dimension, that is to say of the diameter D 3 the smallest but greater than the diameter D 2 of the tube.
  • the collars 7, 8 may be standard collars.
  • the normal thickness e of the ring 6 can be of the order of 1.5 millimeters or more, while the axial length L of the ring varies depending on the type of tube fitted.
  • the ring 6 is put in place on the neck 1 of the tube as illustrated in FIG. 2 before magnetization of this ring.
  • the static convergence correction is then obtained definitively and there is no longer any subsequent operation for fixing the ring 6.
  • FIG. 3 An additional advantage of the invention as illustrated in FIG. 3 results from the fact that it is optionally possible to adapt over the ring 6 an additional correction ring 9 which can be fixed in a conventional manner like a non-magnetic clamp. around this ring.
  • the collar 9 may for example carry small correction magnets.
  • these collars may have a circular section as illustrated.
  • they can be given an elliptical or even rectangular or square section, although the provision of rounded angle sections will generally facilitate the introduction and proper positioning of the ring 6 over the collars.
  • two collars will be used, placed at a distance from each other slightly less than the length L of the ring 6, making it possible to obtain perfect results.

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Description

La présente invention a pour objet un dispositif de mise en place et de fixation de l'unité de correction des convergences statiques sur le col d'un tube de télévision en couleurs.The present invention relates to a device for installing and fixing the static convergence correction unit on the neck of a color television tube.

On sait que pour les tubes de télévision en couleurs, on utilise montés à l'arrière du tube dans une région dite « col » trois canons projetant trois faisceaux d'électrons qui correspondent chacun à une des trois couleurs bleue, verte ou rouge des phosphores ou luminophores de couleur correspondante frappés par les électrons projetés par leurs canons respectifs. D'autre part, sur le trajet de ces faisceaux, à l'arrière du tube, à faible distance des canons est monté le bloc de déviation qui commande les balayages des faisceaux pour former l'image. Cependant, le premier réglage imposé est d'amener les trois faisceaux, lorsqu'aucune déviation ne leur est appliquée, à frapper le centre de la dalle-écran du tube. Ce réglage est assuré de façon classique par l'unité de correction des convergences statiques qui est constituée par plusieurs petits aimants dont les champs magnétiques qui interfèrent permettent d'effectuer le réglage désiré. Cette unité de correction vient se placer habituellement juste derrière le bloc de déviation du tube. Sa mise en place sur le tube, son positionnement précis et les opérations de réglage et de maintenance qui y sont associés posent de délicats problèmes que l'invention permet de résoudre de manière simple et économique.We know that for color television tubes, we use mounted at the rear of the tube in a region called "neck" three guns projecting three electron beams which each correspond to one of the three colors blue, green or red phosphors or phosphors of corresponding color struck by the electrons projected by their respective guns. On the other hand, on the path of these beams, at the rear of the tube, a short distance from the guns, is mounted the deflection block which controls the scans of the beams to form the image. However, the first imposed adjustment is to cause the three beams, when no deviation is applied to them, to strike the center of the screen slab of the tube. This adjustment is ensured in a conventional manner by the static convergence correction unit which is constituted by several small magnets whose magnetic fields which interfere make it possible to carry out the desired adjustment. This correction unit is usually placed just behind the tube deflection block. Its positioning on the tube, its precise positioning and the adjustment and maintenance operations associated therewith pose delicate problems which the invention makes it possible to solve in a simple and economical manner.

Selon l'art antérieur connu, l'unité de correction des convergences statiques pouvait comprendre divers éléments unitaires ajustables qui étaient fixés, par exemple collés, derrière le bloc de déviation du tube. Un tel procédé est long, difficilement industrialisable et ne permet pas d'effectuer des réglages de manière souple.According to the known prior art, the static convergence correction unit could comprise various adjustable unit elements which were fixed, for example glued, behind the deflection block of the tube. Such a process is long, difficult to industrialize and does not allow adjustments to be made flexibly.

Selon un autre procédé de l'art antérieur, on place derrière le bloc de déviation une bague habituellement constituée en un matériau plastique chargé de ferrite que l'on peut magnétiser de la façon la plus convenable pour obtenir les corrections de convergence statique désirées. Cette bague peut être fendue, et dans ce cas, sa fixation sur le col du tube est assurée par serrage au moyen d'un collier métallique extérieur. Les opérations de réglage ne sont pas très aisées car la magnétisation de la bague ne peut se faire avec le collier métallique de fixation en place. D'autre part, le fait que la bague soit fendue introduit également un entrefer défavorable à un bon réglage.According to another method of the prior art, a ring usually made of a plastic material loaded with ferrite is placed behind the deflection block which can be magnetized in the most suitable way to obtain the desired static convergence corrections. This ring can be split, and in this case, its attachment to the neck of the tube is ensured by tightening by means of an external metal collar. The adjustment operations are not very easy because the magnetization of the ring cannot be done with the metal fixing collar in place. On the other hand, the fact that the ring is split also introduces an air gap unfavorable for a good adjustment.

Selon une autre technique connue, la bague en matériau plastique chargé de ferrite n'est pas fendue, ce qui élimine le problème de l'entrefer. Par contre, cela introduit un problème difficile à résoudre de positionnement précis de cette bague sur le col du tube, compte tenu des tolérances de fabrication notamment du verre du tube et du jeu relativement important et variable existant entre les parois du col du tube et de l'unité de correction des convergences statiques. Ce jeu axial est défavorable à la fois au niveau de la réalisation du réglage et au niveau de la fixation de la bague sur le col du tube.According to another known technique, the ring of plastic material loaded with ferrite is not split, which eliminates the problem of the air gap. On the other hand, this introduces a problem difficult to solve of precise positioning of this ring on the neck of the tube, taking into account the manufacturing tolerances in particular of the glass of the tube and of the relatively large and variable clearance existing between the walls of the neck of the tube and of the static convergence correction unit. This axial play is unfavorable both at the level of the realization of the adjustment and at the level of the fixing of the ring on the neck of the tube.

Selon un autre état de la technique, il est connu d'intercaler entre l'unité de correction des convergences statiques et le col du tube, un élément de fixation à encoche, collé sur le col ou fixé par un moyen supplémentaire.According to another state of the art, it is known to interpose, between the static convergence correction unit and the neck of the tube, a notched fixing element, glued to the neck or fixed by additional means.

On peut citer le brevet BE-A-528 230 où le col du tube comporte deux excroissances annulaires sur lesquelles glisse une douille portant l'aimant de concentration. On peut citer aussi le brevet FR-A-2 306 522 où la bague de correction comporte un support annulaire en matériau synthétique à l'extérieur duquel est disposé l'aimant de correction.We can cite patent BE-A-528,230 where the neck of the tube has two annular protuberances over which slides a sleeve carrying the concentration magnet. Mention may also be made of patent FR-A-2 306 522 in which the correction ring comprises an annular support of synthetic material outside of which the correction magnet is disposed.

Pour porter remède aux inconvénients de l'art antérieur, la présente invention concerne un dispositif de mise en place et de fixation de l'unité de correction de convergence statique sur le col d'un tube de télévision en couleurs, du type comportant un corps intercalaire entre le col du tube et ladite unité de correction de convergence statique, ladite unité de correction étant composée essentiellement d'une bague cylindrique fermée en matière plastique chargée en ferrite, laquelle bague a un diamètre intérieur D3 légèrement supérieur au diamètre extérieur D2 du col 1 du tube qu'elle doit équiper, caractérisé en ce qu'il comprend au moins un et de préférence deux colliers élastiques 7, 8 en matériau élastomère résistant à la chaleur tel qu'un caoutchouc siliconé qui sont disposés en extension autour du col du tube et ont une section d'épaisseur réduite, soit un à deux millimètres environ, le(s) dit(s) collier(s) élastique(s) étant comprimé(s) par la paroi de ladite unité positionnée sur le col par-dessus le(s) dit(s) collier(s).To remedy the drawbacks of the prior art, the present invention relates to a device for installing and fixing the static convergence correction unit on the neck of a color television tube, of the type comprising a body interlayer between the neck of the tube and said static convergence correction unit, said correction unit essentially consisting of a closed cylindrical ring made of plastic loaded with ferrite, which ring has an inside diameter D 3 slightly greater than the outside diameter D 2 of the neck 1 of the tube which it must equip, characterized in that it comprises at least one and preferably two elastic collars 7, 8 made of heat-resistant elastomeric material such as silicone rubber which are arranged in extension around the neck of the tube and have a reduced thickness section, that is to say one to two millimeters, the said elastic collar (s) being compressed by the wall of said positioned unit on the collar over the said collar (s).

On comprend que, de cette façon, la mise en place de l'unité de correction est considérablement facilitée. En outre, il n'est plus nécessaire d'utiliser aucune pièce supplémentaire pour venir fixer l'unité de correction sur le col du tube après sa mise en place.It is understood that, in this way, the establishment of the correction unit is considerably facilitated. In addition, it is no longer necessary to use any additional part to fix the correction unit on the neck of the tube after its installation.

Selon une autre caractéristique de l'invention, on effectue la magnétisation désirée de l'unité de correction des convergences statiques lorsque celle-ci est en place sur le col du tube, ce qui facilite l'opération et la rend aisément industrialisable.According to another characteristic of the invention, the desired magnetization of the static convergence correction unit is carried out when the latter is in place on the neck of the tube, which facilitates the operation and makes it easily industrializable.

Le dispositif selon l'invention comprend une unité de correction des convergences statiques composée essentiellement d'une bague cylindrique plastique fermée chargée en ferrite de diamètre inférieur légèrement supérieur au diamètre extérieur du col du tube qu'elle doit équiper, au moins un et de préférence deux colliers élastiques en matériau élastomère résistant à la chaleur tel que le caoutchouc siliconé ayant à l'état de repos un diamètre inférieur au diamètre extérieur du col et une section d'épaisseur réduite d'environ un à deux millimètres, ledit dispositif, en position de montage sur le tube, comportant ladite unité positionnée sur le col par-dessus lesdits colliers élastiques comprimés entre les parois en regard de ladite unité et dudit col.The device according to the invention comprises a static convergence correction unit essentially composed of a closed plastic cylindrical ring loaded with ferrite of diameter less than slightly greater than the outside diameter of the neck of the tube which it must equip, at least one and preferably two elastic collars made of heat-resistant elastomeric material such as silicone rubber having in the rest state a diameter less than the outside diameter of the neck and a section of reduced thickness about one to two millimeters, said device, in the mounting position on the tube, comprising said unit positioned on the neck over said elastic collars compressed between the facing walls of said unit and said neck.

L'invention apparaîtra plus clairement à l'aide de la description détaillée qui va suivre faite en référence aux dessins annexés illustrant un exemple de mise en oeuvre et dans lesquels :

  • La figure 1 montre en vue élévation faite avec arrachement et schématiquement la partie arrière d'un tube de télévision sur lequel on met en place le dispositif de l'invention,
  • La figure 2 est une vue semblable à celle de la figure 1 montrant le stade de positionnement final du dispositif,
  • La figure 3 montre le dispositif tel qu'équipé à la figure 2 et ayant reçu un organe de correction supplémentaire,
  • Les figures 4 et 5 montrent en vue perspective respectivement la bague formant unité de correction des convergences statiques et les colliers élastiques de positionnement utilisés selon l'invention,
  • La figure 6 est une vue à plus grande échelle du détail entouré VI à la figure 2.
The invention will appear more clearly with the aid of the detailed description which follows, given with reference to the appended drawings illustrating an example of implementation and in which:
  • FIG. 1 shows in elevation view with cutaway and schematically the rear part of a television tube on which the device of the invention is put in place,
  • FIG. 2 is a view similar to that of FIG. 1 showing the final positioning stage of the device,
  • FIG. 3 shows the device as fitted in FIG. 2 and having received an additional correction device,
  • FIGS. 4 and 5 show in perspective view, respectively, the ring forming a unit for static convergence correction and the elastic positioning collars used according to the invention,
  • FIG. 6 is an enlarged view of the detail surrounded by VI in FIG. 2.

En se référant tout d'abord à la figure 1, on aperçoit la partie arrière ou col 1 d'un tube de télévision en couleurs 2 sur lequel on vient de monter de toute manière connue le bloc de déviation 3 dont le contour extérieur a été montré en pointillé à la figure et dont on n'a repéré sur les figures 2 et 3 que la face arrière 4 contre laquelle on vient monter l'unité de correction des convergences statiques légèrement en avant des canons (non représentés) situés à l'intérieur du col à l'extrémité arrière de ce dernier. Sur la figure 1, les lettres AR repèrent la direction arrière par rapport à la direction avant repérée AV du tube dont l'axe a été repéré 5.Referring first to Figure 1, we see the rear part or neck 1 of a color television tube 2 on which we just mounted in any known manner the deflection block 3 whose outer contour has been shown in dotted lines in the figure and of which we have identified in FIGS. 2 and 3 only the rear face 4 against which we have mounted the static convergence correction unit slightly in front of the barrels (not shown) located at inside of the collar at the rear end of the latter. In FIG. 1, the letters AR mark the rear direction with respect to the front direction marked AV of the tube whose axis has been marked 5.

Conformément à l'invention, on utilise comme unité de correction des convergences statiques une bague cylindrique fermée 6 connue en soi visible notamment aux figures 2 et 4. Cette bague est avantageusement constituée d'une matière plastique de qualité appropriée chargée en ferrite, de sorte qu'on peut y créer les éléments magnétiques polaires désirés pour obtenir la correction de convergence statique magnétique désirée.In accordance with the invention, a closed cylindrical ring 6 known per se which can be seen in particular in FIGS. 2 and 4 is used as the static convergence correction unit. This ring is advantageously made of a suitable quality plastic material loaded with ferrite, so that you can create the desired polar magnetic elements to obtain the desired magnetic static convergence correction.

Le problème qui se posait selon l'art antérieur pour utiliser une telle bague était que compte tenu des tolérances de fabrication notamment du col 1 du tube en verre 2, il fallait prévoir un jeu relativement important et variable d'un tube à l'autre entre la paroi intérieure d'une bague 6 et la paroi extérieure du col 1, et l'on ne savait réaliser une bonne fixation de la bague.The problem which arose according to the prior art for using such a ring was that taking into account the manufacturing tolerances, in particular of the neck 1 of the glass tube 2, it was necessary to provide for a relatively large and variable clearance from one tube to another. between the inner wall of a ring 6 and the outer wall of the neck 1, and it was not known how to achieve good fixing of the ring.

Au contraire de cela, conformément à l'invention, ce jeu est mis à profit de la façon qui va être expliquée maintenant.On the contrary, in accordance with the invention, this game is used in the manner which will be explained now.

Sur le col 1, derrière le bloc de déviation 3, on engage deux anneaux ou colliers élastiques en caoutchouc de qualité appropriée repérés respectivement 7 et 8. Les dimensions de ces anneaux sont telles que leur diamètre D1 (figure 5) est à l'état de repos nettement inférieur au diamètre extérieur D2 d'un col de tube. Par exemple, si le col a un diamètre D2 de l'ordre de 29 millimètres, le diamètre D1 des colliers 7 et 8 pourra être de l'ordre de 13 à 26 millimètres. Ainsi, les colliers 7 et 8 sont positionnés sur le col 1 en extension et restent en place d'eux-mêmes.On the neck 1, behind the deflection block 3, two elastic rings or elastic collars of appropriate quality marked 7 and 8 are engaged. The dimensions of these rings are such that their diameter D 1 (FIG. 5) is state of rest significantly lower than the outside diameter D 2 of a tube neck. For example, if the neck has a diameter D 2 of the order of 29 millimeters, the diameter D 1 of the collars 7 and 8 may be of the order of 13 to 26 millimeters. Thus, the collars 7 and 8 are positioned on the neck 1 in extension and remain in place of themselves.

Ensuite, on enfile par dessus le col 1 du tube et par dessus les deux colliers 7, 8 la bague 6 formant unité de correction des convergences statiques et dont le diamètre intérieur D3 est légèrement supérieur au diamètre D2, par exemple de l'ordre de 30 millimètres. Ayant pris soin de choisir une épaisseur d de la section des colliers 7 et 8 suffisante, par exemple de l'ordre de 1 à 2 millimètres, on comprend que le positionnement de la bague 6 sur le col 1 par dessus les colliers 7 et 8 ne pourra se faire comme il apparaît plus clairement aux figures 2 et 6 qu'avec un certain écrasement de la section des colliers 7 et 8, ce qui assure simultanément le parfait positionnement tant axial que diamétral de la bague 6 sur le collier 1. En exemple donné où le diamètre D2 moyen du col 1 du tube est de 29 millimètres, on pourra choisir un diamètre intérieur moyen de la bague 6 de 30 millimètres, ce qui donne un jeu moyen diamétral de 1 millimètre permettant d'absorber les tolérances de fabrication normales. Dans de telles conditions, on choisira avantageusement une épaisseur d de la section des colliers de l'ordre de 1,5 à 2 millimètres, de façon à obtenir un écrasement suffisant de ces colliers lors de la mise en place de l'unité de correction des convergences statiques 6. On notera que si les tolérances de fabrication des tubes sont supérieures au millimètre pour la valeur du diamètre du col, on pourra prévoir un jeu de plusieurs bagues de correction 6 ayant des diamètres s'étageant de millimètre en millimètre et l'on adaptera chaque fois sur le col du tube la bague de dimension la plus adaptée, c'est-à-dire du diamètre D3 le plus faible mais supérieur au diamètre D2 du tube. Dans ces conditions, les colliers 7, 8 pourront être des colliers standard.Then, one threads over the neck 1 of the tube and over the two collars 7, 8 the ring 6 forming a unit for correcting static convergences and whose internal diameter D 3 is slightly greater than the diameter D 2 , for example of the order of 30 millimeters. Having taken care to choose a thickness d of the section of the collars 7 and 8 sufficient, for example of the order of 1 to 2 millimeters, it is understood that the positioning of the ring 6 on the neck 1 over the collars 7 and 8 can only be done as it appears more clearly in FIGS. 2 and 6 only with a certain crushing of the section of the collars 7 and 8, which simultaneously ensures perfect positioning both axially and diametrically of the ring 6 on the collar 1. In example given where the mean diameter D 2 of the neck 1 of the tube is 29 millimeters, it is possible to choose an average inner diameter of the ring 6 of 30 millimeters, which gives a diametral mean clearance of 1 millimeter making it possible to absorb the tolerances normal manufacturing. Under such conditions, it is advantageous to choose a thickness d of the section of the collars of the order of 1.5 to 2 millimeters, so as to obtain sufficient crushing of these collars during the positioning of the correction unit. static convergences 6. It will be noted that if the manufacturing tolerances of the tubes are greater than a millimeter for the value of the diameter of the neck, it will be possible to provide a set of several correction rings 6 having diameters ranging from millimeter to millimeter and l 'We will adapt each time on the neck of the tube the ring of the most suitable dimension, that is to say of the diameter D 3 the smallest but greater than the diameter D 2 of the tube. Under these conditions, the collars 7, 8 may be standard collars.

Etant donné que cette partie du col du tube est relativement chaude lorsque le tube fonctionne, les colliers 7, 8 seront avantageusement constitués en un matériau élastomère aux silicones pouvant présenter par exemple les caractéristiques suivantes :

  • dureté : 50 degrés Shore,
  • allongement à la rupture : 400 %.
Since this part of the neck of the tube is relatively hot when the tube is in operation, the collars 7, 8 will advantageously be made of a silicone elastomer material which may have, for example, the following characteristics:
  • hardness: 50 degrees Shore,
  • elongation at break: 400%.

A titre d'exemple, on mentionnera que l'épaisseur normale e de la bague 6 peut être de l'ordre de 1,5 millimètre ou davantage, tandis que la longueur axiale L de la bague varie en fonction du type de tube équipé.By way of example, it will be mentioned that the normal thickness e of the ring 6 can be of the order of 1.5 millimeters or more, while the axial length L of the ring varies depending on the type of tube fitted.

De façon avantageuse, on effectue la mise en place de la bague 6 sur le col 1 du tube comme illustré à la figure 2 avant magnétisation de cette bague. Lorsqu'elle est en place, on procède alors dans une machine magnétisante classique dans ia technique au centrage des trois faisceaux d'électrons, et lorsque le bon centrage est obtenu, on magnétise en concordance la bague 6 en y créant les masses polaires aux endroits désirés. La correction de convergence statique est alors obtenue de façon définitive et il n'y a plus à procéder à aucune opération ultérieure de fixation de la bague 6.Advantageously, the ring 6 is put in place on the neck 1 of the tube as illustrated in FIG. 2 before magnetization of this ring. When it is in place, we then proceed in a conventional magnetizing machine in the technique to center the three electron beams, and when the correct centering is obtained, the ring 6 is magnetized in concordance by creating the polar masses therein at the desired locations. The static convergence correction is then obtained definitively and there is no longer any subsequent operation for fixing the ring 6.

Un avantage supplémentaire de l'invention comme illustré à la figure 3 résulte de ce qu'il est possible éventuellement d'adapter par-dessus la bague 6 une bague supplémentaire 9 de correction qui pourra être fixée de façon classique comme un collier de serrage amagnétique autour de cette bague. Le collier 9 pourra porter par exemple des petits aimants de correction.An additional advantage of the invention as illustrated in FIG. 3 results from the fact that it is optionally possible to adapt over the ring 6 an additional correction ring 9 which can be fixed in a conventional manner like a non-magnetic clamp. around this ring. The collar 9 may for example carry small correction magnets.

Parmi les avantages obtenus selon l'invention, on pourra noter en particulier les suivants :

  • a) la bague 6 étant cylindrique fermée, il n'y a pas d'entrefer néfaste au bon fonctionnement du dispositif ;
  • b) la bague 6 peut être fabriquée de façon extrêmement économique selon des normes de fabrication très simples ; éventuellement plusieurs diamètres de bague peuvent être prévus ;
  • c) les bobines de magnétisation de la machine à magnétiser la bague seront toujours à une distance déterminée de la bague 6, d'où il résultera une parfaite constance des actions de magnétisation permettant un équilibrage magnétique parfait ;
  • d) la distance entre les bobines de magnétisation de la machine à magnétiser et la bague 6 peut être réduite ce qui accroît l'efficacité de la machine ;
  • e) des dispositifs supplémentaires de correction peuvent être appliqués par-dessus la bague de correction dé convergence statique montée selon l'invention ;
  • f) le dispositif correspond à une fabrication et à une maintenance économiques, la bague pouvant être éventuellement démontée et réutilisée.
Among the advantages obtained according to the invention, the following may be noted in particular:
  • a) the ring 6 being closed cylindrical, there is no gap harmful to the proper functioning of the device;
  • b) the ring 6 can be manufactured extremely economically according to very simple manufacturing standards; possibly several ring diameters can be provided;
  • c) the magnetization coils of the machine for magnetizing the ring will always be at a determined distance from the ring 6, from which there will result perfect consistency of the magnetization actions allowing perfect magnetic balancing;
  • d) the distance between the magnetizing coils of the magnetizing machine and the ring 6 can be reduced, which increases the efficiency of the machine;
  • e) additional correction devices can be applied over the static convergence correction ring mounted according to the invention;
  • f) the device corresponds to economical production and maintenance, the ring possibly being disassembled and reused.

En ce qui concerne la structure des colliers ou anneaux 7, 8, on notera que ces colliers pourront avoir une section circulaire comme illustré. Even- tuellement, on pourra leur donner une section elliptique ou même rectangulaire ou carrée, encore que la prévision de sections à angle arrondi facilitera en général l'introduction et la bonne mise en place de la bague 6 par-dessus les colliers.With regard to the structure of the collars or rings 7, 8, it will be noted that these collars may have a circular section as illustrated. Optionally, they can be given an elliptical or even rectangular or square section, although the provision of rounded angle sections will generally facilitate the introduction and proper positioning of the ring 6 over the collars.

De préférence, deux colliers seront utilisés, placés à une distance l'un de l'autre légèrement inférieure à la longueur L de la bague 6, permettant d'obtenir de parfaits résultats.Preferably, two collars will be used, placed at a distance from each other slightly less than the length L of the ring 6, making it possible to obtain perfect results.

Claims (6)

1. Device for placing and fixing the static convergence correction unit on the neck of a color television tube, of the type comprising an interposed body between the neck of the tube and said static convergence correction unit, said correction unit being essentially composed of a closed cylindrical ring (6) of plastics material loaded with ferrit, said ring having an inner diameter (D3) slightly exceeding the outer diameter (D2) of the neck (1) of the tube to be equipped therewith, characterized in that it comprises at least one and preferentially two resilient collars (7, 8) of heat- resistant elastomer material such as silicone rubber which are stretched around the tube neck and have a section of a small thickness, i. e. about 1 to 2 mm, said resilient collar(s) being compressed by the wall of said unit positioned on the neck over said collar(s).
2. Device according to claim 1, characterized in that it comprises two collars (7, 8) arranged at the desired position of the neck (1) and spaced from each other by a distance which is slightly smaller than the length (L) of said ring (6) measured in the direction of its axis.
3. Device according to any of claims and 2, characterized in that said ring (6) is susceptible to be magnetized when it is placed on the neck (1) of the tube.
4. Device according to claim 1, characterized in that said collars have a substantially circularly rounded section.
5. Device according to claim 1, characterized in that said collars have a substantially eliptically rounded section.
6. Device according to claim 1, characterized in that said collars have a substantially rectangular or square section.
EP82401633A 1981-09-16 1982-09-07 Apparatus for placing and fixing the static convergence correction unit to the neck of a colour television tube Expired EP0074891B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8117520A FR2513010A1 (en) 1981-09-16 1981-09-16 METHOD AND DEVICE FOR ESTABLISHING AND FIXING THE STATIC CONVERGENCE CORRECTION UNIT ON THE COLUMN OF A COLOR TELEVISION TUBE
FR8117520 1981-09-16

Publications (2)

Publication Number Publication Date
EP0074891A1 EP0074891A1 (en) 1983-03-23
EP0074891B1 true EP0074891B1 (en) 1986-05-07

Family

ID=9262202

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401633A Expired EP0074891B1 (en) 1981-09-16 1982-09-07 Apparatus for placing and fixing the static convergence correction unit to the neck of a colour television tube

Country Status (9)

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US (1) US4453921A (en)
EP (1) EP0074891B1 (en)
JP (1) JPS5859538A (en)
DE (1) DE3271009D1 (en)
ES (1) ES515727A0 (en)
FR (1) FR2513010A1 (en)
HK (1) HK94189A (en)
PT (1) PT75485B (en)
SG (1) SG29489G (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5568010A (en) * 1995-11-16 1996-10-22 Philips Electronics North America Corporation Cathode ray tube with improved yoke clamp
US20020030431A1 (en) * 2000-09-12 2002-03-14 Baran Anthony Stanley Apparatus for correcting static electron beam landing error
JP4901946B2 (en) * 2009-12-16 2012-03-21 株式会社牧野フライス製作所 Sliding guide device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456399A (en) * 1945-10-24 1948-12-14 Gen Electric Cathode-ray apparatus
US2544875A (en) * 1950-03-02 1951-03-13 Pye Ltd Combination centering, focusing, and deflecting device for beam of cathode-ray tubes
US2643373A (en) * 1950-07-21 1953-06-23 Tele King Corp Mounting of cathode-ray tubes for television reception
BE528230A (en) * 1953-04-21
NL170683C (en) * 1975-04-01 1982-12-01 Philips Nv METHOD FOR MANUFACTURING A STATIC CONVERGENCE UNIT AND A COLOR IMAGE TUBE INCLUDING A CONVERGENCE UNIT, MANUFACTURED USING THAT METHOD
US4030126A (en) * 1976-01-16 1977-06-14 Gte Sylvania Incorporated Support means for a CRT beam adjustment device
JPS55137650A (en) * 1979-04-16 1980-10-27 Ricoh Co Ltd Cathode ray tube-focusing phototransmission unit array mounting construction
US4261017A (en) * 1979-12-27 1981-04-07 Rca Corporation Electron beam influencing apparatus
US4338584A (en) * 1980-11-24 1982-07-06 Rca Corporation Television deflection yoke mount

Also Published As

Publication number Publication date
US4453921A (en) 1984-06-12
PT75485B (en) 1984-10-29
EP0074891A1 (en) 1983-03-23
HK94189A (en) 1989-12-08
PT75485A (en) 1982-09-01
DE3271009D1 (en) 1986-06-12
FR2513010A1 (en) 1983-03-18
ES8306920A1 (en) 1983-06-01
FR2513010B1 (en) 1983-10-21
SG29489G (en) 1991-01-04
JPS5859538A (en) 1983-04-08
ES515727A0 (en) 1983-06-01

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