EP0123613A2 - Apparatus for positioning a deflection unit on a television tube, especially a colour tube - Google Patents

Apparatus for positioning a deflection unit on a television tube, especially a colour tube Download PDF

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Publication number
EP0123613A2
EP0123613A2 EP84400761A EP84400761A EP0123613A2 EP 0123613 A2 EP0123613 A2 EP 0123613A2 EP 84400761 A EP84400761 A EP 84400761A EP 84400761 A EP84400761 A EP 84400761A EP 0123613 A2 EP0123613 A2 EP 0123613A2
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EP
European Patent Office
Prior art keywords
platform
tube
deflector
freedom
arms
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84400761A
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German (de)
French (fr)
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EP0123613B1 (en
EP0123613A3 (en
Inventor
Claude Pons
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Videocolor SA
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Videocolor SA
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Priority to AT84400761T priority Critical patent/ATE35879T1/en
Publication of EP0123613A2 publication Critical patent/EP0123613A2/en
Publication of EP0123613A3 publication Critical patent/EP0123613A3/en
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Publication of EP0123613B1 publication Critical patent/EP0123613B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/44—Factory adjustment of completed discharge tubes or lamps to comply with desired tolerances

Definitions

  • the invention relates to an apparatus for adjusting the position of a deflector on a television tube, in particular in color of the mask type.
  • a television tube includes a screen on which are deposited phosphors which emit light when struck by an electron beam. The latter is generated by an electron gun inside the tube and the displacement of the electron beam, to move the light point, along lines is obtained by variation of magnetic fields produced by variable currents in coils called deflectors.
  • the positioning of the deflector relative to the tube must be particularly careful because any defect in this positioning results in a deterioration of the image reproduced on the screen.
  • the adjustment of the position of the deflector relative to the tube is particularly delicate, in particular for color television tubes, especially if one wants to have an autoconvergent system, that is to say one which does not require d, corrections made by the circuits associated with the deflector-tube assembly.
  • the screen is covered with triplets of luminescent substances, each element of the triplet being of a fundamental red, green and blue color and three electron guns are provided, one gun having to excite a determined color. ; so in a self-converging tube it is the deflector which ensures the convergence of the three electron beams over the entire surface of the screen; each electron beam must also reach only the phosphors of the corresponding color. Convergence is obtained by a displacement of the deflector parallel to the screen while the purity of the colors (the beam intended for a color only reaches the phosphors of this color) is adjusted by displacement of the deflector perpendicular to the screen.
  • the means for controlling and moving the deflector support consist of a carriage and rocking mechanism which is relatively complex.
  • the adjustment operation is difficult since it involves several parameters at the same time; moreover, it is painful because the operator must constantly observe the bright screen.
  • the apparatus according to the invention does not have these drawbacks.
  • the support comprises a platform which is horizontal in its average position and is carried by n oblique arms regularly distributed around the deflector, each of which has a translational movement command at its base.
  • the automatic loading of the tube on the platform and the adjustments are easy.
  • a large space can be provided for the devices for feeding the tube between the arms, under the platform.
  • the forces being better distributed over the arms these can be dimensioned less consistently than in the known apparatus.
  • the apparatus according to the invention can be fully automated.
  • you must first carry out a calibration, i.e. measure precisely the effect of the different movements of the deflector, according to each of its degrees of freedom, on the convergence and the purity of the image reproduced on the screen.
  • a calibration instead of using empirical measurements, a calculation can be made.
  • the program me which is within the reach of those skilled in the art, varies depending on the type of tube to be adjusted.
  • each linear displacement element is connected to the support of the deflector by means of an arm, one end of which is connected by a ball joint to said element and the other end is connected by another ball joint to the support.
  • ball joints are for example simple flexible rods the ends of which are embedded in the parts which they connect: the first flexible rod forming a ball joint is embedded on the one hand in the element with linear displacement and on the other hand in the arm , while the second ball joint is embedded by one end in said arm and by the other end, in a connecting device fixed to the platform.
  • the number n of elements with linear displacement is preferably equal to six, which allows the support to be displaced in all directions.
  • the position of a solid in space is determined by six parameters (corresponding to the six degrees of freedom): three coordinates for the position of a point of this solid and three other coordinates for the orientation of the solid in space.
  • the device for adjusting the position of a deflector 10 relative to the screen 10 of a color television tube 10 2 comprises a horizontal platform 11 of generally circular shape having a central opening 12 forming receiving housing for the diverter 10.
  • This deflector 10 is fixed to the platform 11 by means of jaws 13, the displacement of each of which is controlled by a jack 14.
  • the end of each of the jaws 13 has a notch 15 cooperating with a projection 16 at the periphery of the carcass of the deflector.
  • the platform 11 is supported by six arms or legs 17, 18, 19, 20, 21 and 22 each of which is movable to vary the position of the platform 11, and therefore that of the diverter 10, by compared to the tube. Each arm ensures the mobility of the platform 11, and therefore also that of the diverter 10, according to a degree of freedom.
  • the arms 17 to 22 are identical to each other.
  • This arm comprises a rigid rod 25 at the ends of which sockets 26, 27 are fixed.
  • the sleeve 26 at the upper end of the rod 25 accommodates a certain length of a cylindrical rod 28 of small diameter which is both resistant and flexible, for example being of the piano string type.
  • the upper end of this small diameter rod 28 is also embedded in a socket 29 fixed under the platform 11.
  • This rod 28 between the sockets 26 and 29 forms a ball without play.
  • the sleeve 27 at the lower end of the rigid rod 25 houses the upper end of a rod 30 of the piano string type identical to the rod 28 and forming like it a ball joint without play.
  • the lower end of the latter rod 30 is embedded in a sleeve 31 movable in a linear movement, that is to say in a simple translation.
  • the sleeve 31 is integral with a cylinder 32 projecting from a piston 32a and the lower end of which has a thread cooperating with a screw 33 driven in rotation by a stepping motor 34.
  • the piston 32a is square section; it has at its periphery slides 32 b made of plastic to facilitate the sliding in a channel 35 of a frame 36 to which the support 37 of the motor 34 is fixed.
  • the square section of the piston 32 a and therefore of the channel 35 prevents rotation of this piston; thus the latter only moves in translation.
  • the position of the piston 32, and therefore those of the bush 31 and of the ball joint 30, is measured by a transducer 37 comprising, in the example, a rod 38 fixed to the bush 31 by means of a bent arm 39 so that this rod 38 is parallel to the axis common to the socket 31 and to the screw 33.
  • This rod 38 actuates, for example, the cursor of a potentiometer, the electrical signal at the terminals of this potentiometer then representing the position udder your 32a.
  • the body 40 of said transducer 37 is, like the support 37a of the motor 34, fixed to the frame 36.
  • FIG. 3 schematically represents the horizontal projections of the various arms 17 to 22 when the platform 11 is horizontal.
  • the end 17 1 of the arm 17 represents the axis of articulation of the ball joint 28 and the end 17 2 corresponds to the axis of articulation of the ball joint 30.
  • the ends of each of the other arms correspond, in this figure 3, to the axes of articulation of the upper and lower ball joints.
  • the axes of articulation of the upper ball joints are arranged on a circle 45 - which, in the example, has a diameter of 470 mm - in groups of two near the vertices 46, 47 and 48 of an equilateral triangle inscribed in this circle 45.
  • the projections of these arms are perpendicular to the adjacent sides of the equilateral triangle. These projections are therefore two by two parallel; the projection of the arm 17 is thus parallel to that of the arm 19.
  • the arms form an angle of 45 ° with the vertical when the platform 11 is horizontal (this is its starting position).
  • the axis of the rod 25 is therefore coincident with the axis of the sleeve 31; it follows that the translation axes are also always inclined at 45 ° relative to the vertical.
  • the distance between the ball joints 28 and 30 is of the order of 160 mm while the free length of each of the rods 28 and 30 is 15 mm and its diameter 1.5 mm.
  • the articulation formed by these rods 28 and 30 behaves as if a perfect ball was located in the middle of the free parts of these rods 28 and 30.
  • FIG. 5 is a diagram illustrating the movement of the arm 17 with its articulations at the ends, on the one hand in a state of equilibrium for which the axis of translation of the sleeve 31 is aligned with the axis of the rod 25 and on the other hand, when the stepping motor 34 has been turned so as to move the bushing 31 downwards, that is to say the articulation of the rod 30.
  • the first state of the rod 25 is represented by the segment A 0 B 0 , A 0 and B 0 being the articulations of the rods 28 and 30. It corresponds to the horizontal position of the platform II, position for which the rod A 0 B 0 is aligned with the axis of translation of the mechanism.
  • Detectors 50, 51, 52 (FIG. 2) determine the convergence and purity errors visible on the screen 10 1 and a computer (not shown) makes it possible, from these measurements, to determine the displacements of the points B 0 qu 'It will be necessary for the deflector 10 to move so that in its new position, after displacement, the errors are corrected. So to get the correction you have to move point B O to point B (figure 5).
  • point A O must be moved to A by a translation of the piston 32a.
  • a 0 B 0 AB
  • the arm 25 does not change length from one position to another.
  • the computer determines whether the translation A 0 A allows the measured errors to be corrected.
  • the displacements A 0 A can be progressive.
  • the apparatus according to the invention allows only small amplitude displacements of the deflector, which is sufficient for adjusting the position of this deflector relative to the other elements of the color television tube. Compared to three orthonormal axes formed by the usual axes of symmetry of a tube, the device allows rotations of maximum ⁇ 3 ° around each axis and translations of maximum - 4 mm along each of these axes .
  • the various parts of the device have negligible play. This is particularly the case for the joints which are free of play.
  • the legs support the platform 11 very rigidly. In this way, the positioning of the platform 11, and therefore of the diverter 10, is always ensured very precisely.
  • the device easily adapts to various types of deflectors. It can also be used with a minimum of modifications for adjusting the position of deflectors on tubes of different sizes and / or geometries.
  • the adaptability of the device results from its six degrees of freedom which allow all movements around a reference position. To switch from one tube deflector configuration to another, the device does not have to undergo any structural modification; it suffices to modify the calculation parameters necessary to control the motors 34 which move the deflector to correct the errors measured on the screen of the tube.
  • the transducers 37 make it possible on the one hand to know the position of each socket 31 and on the other hand, to verify that a controlled movement has indeed been carried out.
  • Fixing the diverter on the tube once the adjustments have been made can, like the latter, be carried out without manual intervention, for example using automatic screwdrivers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Color Television Image Signal Generators (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Details Of Television Scanning (AREA)

Abstract

An apparatus for adjusting the position of the deflector of a television tube, particularly a color tube, especially so that the tube deflector assembly may become autoconvergent. The apparatus comprises a platform movable in accordance with n degrees of freedom and n elements such as arms, each of which has its displacement controlled in accordance with only one degree of freedom, for example a simple translatory displacement in order to assure the mobility of the platform in accordance with the n degrees of freedom.

Description

L'invention est relative à un appareil de réglage de la position d'un déviateur sur un tube de télévision, notamment en couleurs du type à masque.The invention relates to an apparatus for adjusting the position of a deflector on a television tube, in particular in color of the mask type.

On sait qu'en télévision, la reproduction des images est obtenue par déplacement d'un point lumineux selon des lignes horizontales de gauche à droite et de haut en bas, l'intensité et la couleur du point étant fonction, à chaque instant, de l'intensité et de la couleur du point correspondant de l'image à reproduire. A cet effet, un tube de télévision comprend un écran sur lequel sont déposées des substances luminophores qui émettent de la lumière lorsqu'elles sont frappées par un faisceau d'électrons. Ce dernier est engendré par un canon à électrons à l'intérieur du tube et le déplacement du faisceau électronique, pour déplacer le point lumineux, selon des lignes est obtenu par variation de champs magnétiques produits par des courants variables dans des bobines appelées déviateurs.We know that in television, the reproduction of the images is obtained by displacement of a luminous point according to horizontal lines from left to right and from top to bottom, the intensity and the color of the point being function, at each moment, of the intensity and color of the corresponding point of the image to be reproduced. For this purpose, a television tube includes a screen on which are deposited phosphors which emit light when struck by an electron beam. The latter is generated by an electron gun inside the tube and the displacement of the electron beam, to move the light point, along lines is obtained by variation of magnetic fields produced by variable currents in coils called deflectors.

Le positionnement du déviateur par rapport au tube doit être particulièrement soigné car tout défaut de ce positionnement se traduit par une altération de l'image reproduite sur l'écran.The positioning of the deflector relative to the tube must be particularly careful because any defect in this positioning results in a deterioration of the image reproduced on the screen.

Le réglage de la position du déviateur par rapport au tube est particulièrement délicat, notamment pour les tubes de télévision en couleurs, surtout si l'on veut disposer d'un système autoconvergent, c'est-à-dire qui ne nécessite pas d, corrections effectuées par les circuits associés à l'ensemble déviateur-tube. En effet dans un tube de télévision en couleurs l'écran est recouvert de triplets de substances luminescentes, chaque élément du triplet étant d'une couleur fondamentale rouge, verte et bleue et on prévoit trois canons à électrons, un canon devant exciter une couleur déterminée; ainsi dans un tube autoconvergent c'est le déviateur qui assure la convergence des trois faisceaux d'électrons sur toute la surface de l'écran ; il faut en outre que chaque faisceau d'électrons n'atteigne que les phosphores de la couleur correspondante. La convergence est obtenue par un déplacement du déviateur parallèlement à l'écran tandis que la pureté des couleurs (le faisceau destiné à une couleur n'atteint que les phosphores de cette couleur) est réglée par déplacement du déviateur perpendiculairement à l'écran.The adjustment of the position of the deflector relative to the tube is particularly delicate, in particular for color television tubes, especially if one wants to have an autoconvergent system, that is to say one which does not require d, corrections made by the circuits associated with the deflector-tube assembly. In fact, in a color television tube, the screen is covered with triplets of luminescent substances, each element of the triplet being of a fundamental red, green and blue color and three electron guns are provided, one gun having to excite a determined color. ; so in a self-converging tube it is the deflector which ensures the convergence of the three electron beams over the entire surface of the screen; each electron beam must also reach only the phosphors of the corresponding color. Convergence is obtained by a displacement of the deflector parallel to the screen while the purity of the colors (the beam intended for a color only reaches the phosphors of this color) is adjusted by displacement of the deflector perpendicular to the screen.

Jusqu'à présent ces réglages s'effectuent soit de façon entièrement manuelle, par exemple à l'aide de cales en caoutchouc entre le déviateur et le tube, soit à l'aide d'une machine. Dans ce dernier cas le déviateur est installé sur une plate-forme déplaçable par rapport à un bâti auquel est fixé le tube proprement dit et l'opérateur effectue le réglage par déplacement de la plate-forme selon plusieurs degrés de liberté jusqu'à obtenir sur l'écran une image avec un minimum de défauts.Until now, these adjustments have been made either entirely manually, for example using rubber wedges between the deflector and the tube, or using a machine. In the latter case, the deflector is installed on a platform that can be moved relative to a frame to which the tube itself is fixed, and the operator makes the adjustment by moving the platform according to several degrees of freedom until obtaining on the screen an image with a minimum of defects.

Les moyens permettant la commande et le déplacement du support de déviateur sont constitués par une mécanique à chariot et à bascule qui est relativement complexe . En outre, l'opération de réglage est malaisée car elle fait intervenir plusieurs paramètres à la fois ; de plus, elle est pénible car l'opérateur doit constamment observer l'écran lumineux.The means for controlling and moving the deflector support consist of a carriage and rocking mechanism which is relatively complex. In addition, the adjustment operation is difficult since it involves several parameters at the same time; moreover, it is painful because the operator must constantly observe the bright screen.

Pour remédier à ces inconvénients on a déjà proposé (brevet US 4 360 839) un appareil pour le réglage de la position d'un déviateur par rapport à un tube de télévision en couleurs du type autoconvergent qui comprend un support mobile selon n degrés de liberté et n bras dont le déplacement de chacun est commandé selon un seul degré de liberté par exemple une simple translation, pour assurer la mobilité du support selon les n degrés de liberté. Chaque bras est selon un axe du tube ou selon un axe perpendiculaire. Dans l'appareil connu des dispositions complexes sont prévues pour que le déplacement d'un bras n'affecte la position du déviateur que selon un axe du tube.To overcome these drawbacks, an apparatus has already been proposed (US Pat. No. 4,360,839) for adjusting the position of a diverter with respect to a color television tube of the self-converging type which comprises a support movable according to n degrees of freedom. and n arms, the displacement of each of which is controlled according to a single degree of freedom, for example a simple translation, to ensure the mobility of the support according to the n degrees of freedom. Each arm is along an axis of the tube or along a perpendicular axis. In the known device, complex arrangements are made so that the movement of an arm affects the position of the deflector only along an axis of the tube.

De plus, on a constaté que le chargement et le déchargement du tube et du déviateur, qui doivent être effectués très souvent sont des opérations complexes ; enfin comme le tube doit être alimenté afin qu'on puisse vérifier sur l'écran que le réglage a été correctement effectué, les moyens d'alimentation sont également d'une installation et d'un démontage malaisés.In addition, it has been found that the loading and unloading of the tube and the deflector, which must be carried out very often, are complex operations; finally as the tube must be fed so that it can be checked on the screen that the adjustment has been correctly made, the supply means are also difficult to install and dismantle.

L'appareil selon l'invention ne présente pas ces inconvénients.The apparatus according to the invention does not have these drawbacks.

Il est caractérisé en ce que tous les éléments dont la commande du déplacement est selon un degré de liberté sont de constitutions identiques et en ce que le support comporte une plate-forme qui est horizontale dans sa position moyenne et est portée par n bras obliques régulièrement répartis autour du déviateur dont chacun présente à sa base une commande de déplacement en translation.It is characterized in that all the elements whose movement control is according to a degree of freedom are of identical constitutions and in that the support comprises a platform which is horizontal in its average position and is carried by n oblique arms regularly distributed around the deflector, each of which has a translational movement command at its base.

Par la disposition horizontale de la plate- forme et la direction oblique des bras régulièrement répartis autour du déviateur le chargement automatique du tube sur la plate-forme et les réglages sont aisés. En outre on peut prévoir un espace important pour les dispositifs d'alimentation du tube entre les bras, sous la plate-forme. De plus les efforts étant mieux répartis sur les bras, ceux-ci peuvent être dimensionnés de façon moins conséquente que dans l'appareil connu.By the horizontal arrangement of the platform and the oblique direction of the arms regularly distributed around the diverter, the automatic loading of the tube on the platform and the adjustments are easy. In addition, a large space can be provided for the devices for feeding the tube between the arms, under the platform. In addition, the forces being better distributed over the arms, these can be dimensioned less consistently than in the known apparatus.

L'appareil selon l'invention peut être entièrement automatisé.A cet effet, on fait appel à des moyens connus de mesure des erreurs de convergence - tels que ceux décrits dans le brevet français n° 80 07412 au nom de la Demanderesse - à des moyens de mesure de la marge de pureté d'un tube, comme décrit dans le brevet US 4 001 877, et à un calculateur qui est programmé pour choisir les éléments qui devront être actionnés, par déplacement linéaire, et la grandeur de ces déplacements, pour effectuer le réglage en fonction des mesures faites sur l'écran. Pour mettre au point le programme du calculateur, il faut, au préalable, procéder à un étalonnage, c'est-à-dire mesurer avec précision l'effet des diffé-- rents mouvements du déviateur, selon chacun de ses degrés de liberté, sur la convergence et la pureté de l'image reproduite sur l'écran. Pour cet étalonnage, au lieu de faire appel à des mesures empiriques, on peut procéder à un calcul. Bien entendu, le programme, qui est à la portée de l'homme de métier, varie en fonction du type de tube à régler.The apparatus according to the invention can be fully automated. To this end, use is made of known means for measuring convergence errors - such as those described in French patent n ° 80 07412 in the name of the Applicant - means for measuring the purity margin of a tube, as described in US Pat. No. 4,001,877, and to a computer which is programmed to choose the elements which will have to be actuated, by linear displacement, and the magnitude of these displacements, to adjust according to the measurements made on the screen. To develop the computer program, you must first carry out a calibration, i.e. measure precisely the effect of the different movements of the deflector, according to each of its degrees of freedom, on the convergence and the purity of the image reproduced on the screen. For this calibration, instead of using empirical measurements, a calculation can be made. Of course, the program me, which is within the reach of those skilled in the art, varies depending on the type of tube to be adjusted.

Egalement pour faciliter l'automatisation, il est avantageux de commander le déplacement linéaire de chaque élément à l'aide d'un moteur électrique. Le mouvement de rotation du moteur électrique est transformé en un mouvement linéaire, par exemple à l'aide d'une vis.Also to facilitate automation, it is advantageous to control the linear movement of each element using an electric motor. The rotational movement of the electric motor is transformed into a linear movement, for example using a screw.

Dans une réalisation, chaque élément à déplacement linéaire est relié au support du déviateur par l'intermédiaire d'un bras dont une extrémité est connectée par une rotule audit élément et l'autre extrémité est connectée par une autre rotule au support.' Ces rotules sont par exemple de simples tiges flexibles dont les bouts sont encastrés dans les pièces qu'elles raccordent : la première tige flexible formant rotule est encastrée d'une part dans l'élément à déplacement linéaire et d'autre part dans le bras, tandis que la seconde rotule est encastrée par un bout dans ledit bras et par l'autre bout, dans un dispositif de liaison fixé à la plate-forme.In one embodiment, each linear displacement element is connected to the support of the deflector by means of an arm, one end of which is connected by a ball joint to said element and the other end is connected by another ball joint to the support. '' These ball joints are for example simple flexible rods the ends of which are embedded in the parts which they connect: the first flexible rod forming a ball joint is embedded on the one hand in the element with linear displacement and on the other hand in the arm , while the second ball joint is embedded by one end in said arm and by the other end, in a connecting device fixed to the platform.

De façon en soi connue le nombre n d'éléments à déplacement linéaire est de préférence égal à six, ce qui permet le déplacement du support dans toutes les directions. En effet, la position d'un solide dans l'espace est déterminée par six paramètres (correspondant aux six degrés de liberté) : trois coordonnées pour la position d'un point de ce solide et trois autres coordonnées pour l'orientation du solide dans l'espace.As is known per se, the number n of elements with linear displacement is preferably equal to six, which allows the support to be displaced in all directions. Indeed, the position of a solid in space is determined by six parameters (corresponding to the six degrees of freedom): three coordinates for the position of a point of this solid and three other coordinates for the orientation of the solid in space.

Quand on prévoit un réglage selon six paramètres à l'aide de six éléments à déplacement linéaire dont chacun est relié à la plate-forme par l'intermédiaire d'un bras articulé à l'élément correspondant et à cette plate-forme, on a constaté que les éléments et les bras travaillaient dans les meilleures conditions, c'est-à-dire avec des efforts minima, quand les articulations des bras au support sont disposées deux par deux au voisinage des sommets d'un triangle équilatéral dans le plan de la plate-forme, quand la projection horizontale de chaque bras au repos est perpendiculaire à un côté de ce triangle équilatéral et quand les bras et les axes de translation, forment avec la verticale, un angle de 43°.When provision is made for adjustment according to six parameters using six linear displacement elements, each of which is connected to the platform by means of an arm articulated with the corresponding element and with this platform, we have found that the elements and the arms worked in the best conditions, that is to say with minimal efforts, when the articulations of the arms to the support are arranged two by two in the vicinity of the vertices of an equilateral triangle in the plane of the platform, when the horizontal projection of each arm at rest is perpendicular to one side of this equilateral triangle and when the arms and the axes of translation, form with the vertical, an angle of 43 °.

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

  • - la figure 1 est une vue schématique de dessus d'une plate-forme, d'un déviateur et de moyens de maintien du déviateur ;
  • - la figure 2 est une vue de côté montrant la plate-forme, un tube, un déviateur et les éléments permettant le réglage de la position de la plate-forme ;
  • - la figure 3 est un schéma en projection horizontale, correspondant à la figure 2 ;
  • - la figure 4 est une vue détaillée d'un élément de réglage de la position de la plate-forme ; et
  • - la figure 5 est un schéma illustrant le fonctionnement de l'élément de la figure 4.
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 top view of a platform, a diverter and means for holding the diverter;
  • - Figure 2 is a side view showing the platform, a tube, a diverter and the elements for adjusting the position of the platform;
  • - Figure 3 is a diagram in horizontal projection, corresponding to Figure 2;
  • - Figure 4 is a detailed view of an element for adjusting the position of the platform; and
  • - Figure 5 is a diagram illustrating the operation of the element of Figure 4.

Dans l'exemple, l'appareil de réglage de la position d'un déviateur 10 par rapport à l'écran 10 d'un tube 102 de télévision en couleurs comprend une plate-forme horizontale 11 de forme générale circulaire présentant une ouverture centrale 12 formant logement de réception pour le déviateur 10.In the example, the device for adjusting the position of a deflector 10 relative to the screen 10 of a color television tube 10 2 comprises a horizontal platform 11 of generally circular shape having a central opening 12 forming receiving housing for the diverter 10.

Ce déviateur 10 est fixé à la plate-forme 11 grâce à des mors 13 dont le déplacement de chacun est commandé par un vérin 14. L'extrémité de chacun des mors 13 comporte une encoche 15 coopérant avec une saillie 16 à la périphérie de la carcasse du déviateur. Ces mors assurent également le centrage du déviateur sur la plate-forme.This deflector 10 is fixed to the platform 11 by means of jaws 13, the displacement of each of which is controlled by a jack 14. The end of each of the jaws 13 has a notch 15 cooperating with a projection 16 at the periphery of the carcass of the deflector. These jaws also ensure the centering of the deflector on the platform.

La plate-forme 11 est supportée par six bras ou jambes 17, 18, 19, 20, 21 et 22 dont chacun(e) est déplaçable pour faire varier la position de la plate-forme 11, et donc celle du déviateur 10, par rapport au tube. Chaque bras assure la mobilité de la plate-forme 11, et donc aussi celle du déviateur 10, selon un degré de liberté.The platform 11 is supported by six arms or legs 17, 18, 19, 20, 21 and 22 each of which is movable to vary the position of the platform 11, and therefore that of the diverter 10, by compared to the tube. Each arm ensures the mobility of the platform 11, and therefore also that of the diverter 10, according to a degree of freedom.

Les bras 17 à 22 sont identiques entre eux.The arms 17 to 22 are identical to each other.

On va maintenant décrire en relation avec la figure 4 un exemple de réalisation d'un bras, par exemple celui de référence 17, et de la commande de son déplacement.We will now describe in relation to FIG. 4 an embodiment of an arm, for example that of reference 17, and of the control of its movement.

Ce bras comporte une tige rigide 25 aux extrémités de laquelle sont fixées des douilles 26, 27. La douille 26 à l'extrémité supérieure de la tige 25 loge une certaine longueur d'une tige cylindrique 28 de faible diamètre qui est à la fois résistante et flexible, étant par exemple du type corde à piano. L'extrémité supérieure de cette tige 28 de faible diamètre est également encastrée dans une douille 29 fixée sous la plate-forme 11.This arm comprises a rigid rod 25 at the ends of which sockets 26, 27 are fixed. The sleeve 26 at the upper end of the rod 25 accommodates a certain length of a cylindrical rod 28 of small diameter which is both resistant and flexible, for example being of the piano string type. The upper end of this small diameter rod 28 is also embedded in a socket 29 fixed under the platform 11.

Cette tige 28 entre les douilles 26 et 29 forme une rotule sans jeu.This rod 28 between the sockets 26 and 29 forms a ball without play.

De façon analogue, la douille 27 à l'extrémité inférieure de la tige rigide 25 loge l'extrémité supérieure d'une tige 30 du type corde à piano identique à la tige 28 et formant comme elle une rotule sans jeu. L'extrémité inférieure de cette dernière tige 30 est encastrée dans une douille 31 déplaçable selon un mouvement linéaire, c'est-à-dire selon une simple translation.Similarly, the sleeve 27 at the lower end of the rigid rod 25 houses the upper end of a rod 30 of the piano string type identical to the rod 28 and forming like it a ball joint without play. The lower end of the latter rod 30 is embedded in a sleeve 31 movable in a linear movement, that is to say in a simple translation.

A cet effet, la douille 31 est solidaire d'un cylindre 32 en saillie d'un piston 32a et dont l'extrémité inférieure présente un taraudage coopérant avec une vis 33 entraînée en rotation par un moteur pas à pas 34. Le piston 32a est de section carrée; il présente à sa périphérie des glissières 32b en matière plastique pour faciliter le coulissement dans un canal 35 d'un bâti 36 auquel est fixé le support 37 du moteur 34. La section carrée du piston 32 a et donc du canal 35 empêche la rotation de ce piston; ainsi ce dernier se déplace uniquement en translation.To this end, the sleeve 31 is integral with a cylinder 32 projecting from a piston 32a and the lower end of which has a thread cooperating with a screw 33 driven in rotation by a stepping motor 34. The piston 32a is square section; it has at its periphery slides 32 b made of plastic to facilitate the sliding in a channel 35 of a frame 36 to which the support 37 of the motor 34 is fixed. The square section of the piston 32 a and therefore of the channel 35 prevents rotation of this piston; thus the latter only moves in translation.

La position du piston 32 , et donc celles de la douille 31 et de la rotule 30, est mesurée par un transducteur 37 comprenant, dans l'exemple, une tige 38 fixée à la douille 31 par l'intermédiaire d'un bras coudé 39 de manière que cette tige 38 soit parallèle à l'axe commun à la douille 31 et à la vis 33. Cette tige 38 actionne, par exemple, le curseur d'un potentiomètre, le signal électrique aux bornes de ce potentiomètre représentant alors la position du piston 32a. Le corps 40 dudit transducteur 37 est, comme le support 37a du moteur 34, fixé au bâti 36.The position of the piston 32, and therefore those of the bush 31 and of the ball joint 30, is measured by a transducer 37 comprising, in the example, a rod 38 fixed to the bush 31 by means of a bent arm 39 so that this rod 38 is parallel to the axis common to the socket 31 and to the screw 33. This rod 38 actuates, for example, the cursor of a potentiometer, the electrical signal at the terminals of this potentiometer then representing the position udder your 32a. The body 40 of said transducer 37 is, like the support 37a of the motor 34, fixed to the frame 36.

La figure 3 représente schématiquement les projections horizontales des divers bras 17 à 22 lorsque la plate-forme 11 est horizontale.FIG. 3 schematically represents the horizontal projections of the various arms 17 to 22 when the platform 11 is horizontal.

Sur cette projection, l'extrémité 171 du bras 17 représente l'axe d'articulation de la rotule 28 et l'extrémité 172 correspond à l'axe d'articulation de la rotule 30. De même, les extrémités de chacun des autres bras correspondent, sur cette figure 3, aux axes d'articulation des rotules supérieures et inférieures. Les axes d'articulation des rotules supérieures sont disposés sur un cercle 45 - qui, dans l'exemple, a un diamètre de 470 mm - par groupes de deux au voisinage des sommets 46, 47 et 48 d'un triangle équilatéral inscrit dans ce cercle 45. Les projections de ces bras sont perpendiculaires aux côtés adjacents du triangle équilatéral. Ces projections sont donc parallèles deux à deux ; la projection du bras 17 est ainsi parallèle à celle du bras 19.In this projection, the end 17 1 of the arm 17 represents the axis of articulation of the ball joint 28 and the end 17 2 corresponds to the axis of articulation of the ball joint 30. Similarly, the ends of each of the other arms correspond, in this figure 3, to the axes of articulation of the upper and lower ball joints. The axes of articulation of the upper ball joints are arranged on a circle 45 - which, in the example, has a diameter of 470 mm - in groups of two near the vertices 46, 47 and 48 of an equilateral triangle inscribed in this circle 45. The projections of these arms are perpendicular to the adjacent sides of the equilateral triangle. These projections are therefore two by two parallel; the projection of the arm 17 is thus parallel to that of the arm 19.

Les bras forment avec la verticale un angle de 45° lorsque la plate-forme 11 est horizontale (c'est sa position de départ). Dans la position horizontale du plateau 11, l'axe de la tige 25 est donc confondu avec l'axe de la douille 31; il en résulte que les axes de translation sont, eux aussi, toujours inclinés à 45° par rapport à la verticale.The arms form an angle of 45 ° with the vertical when the platform 11 is horizontal (this is its starting position). In the horizontal position of the plate 11, the axis of the rod 25 is therefore coincident with the axis of the sleeve 31; it follows that the translation axes are also always inclined at 45 ° relative to the vertical.

Dans l'exemple, la distance entre les rotules 28 et 30 est de l'ordre de 160 mm tandis que la longueur libre de chacune des tiges 28 et 30 est de 15 mm et son diamètre de 1,5 mm. Pour de faibles flexions, l'articulation que forment ces tiges 28 et 30 se comporte comme si une rotule parfaite était située au milieu des parties libres de ces tiges 28 et 30.In the example, the distance between the ball joints 28 and 30 is of the order of 160 mm while the free length of each of the rods 28 and 30 is 15 mm and its diameter 1.5 mm. For weak flexions, the articulation formed by these rods 28 and 30 behaves as if a perfect ball was located in the middle of the free parts of these rods 28 and 30.

La figure 5 est un schéma illustrant le déplacement du bras 17 avec ses articulations aux extrémités, d'une part à l'état d'équilibre pour lequel l'axe de translation de la douille 31 est aligné avec l'axe de la tige 25 et d'autre part, quand on a fait tourner le moteur pas à pas 34 de manière à déplacer vers le bas la douille 31, c'est-à-dire l'articulation de la tige 30.FIG. 5 is a diagram illustrating the movement of the arm 17 with its articulations at the ends, on the one hand in a state of equilibrium for which the axis of translation of the sleeve 31 is aligned with the axis of the rod 25 and on the other hand, when the stepping motor 34 has been turned so as to move the bushing 31 downwards, that is to say the articulation of the rod 30.

Le premier état de la tige 25 est représenté par le segment A0B0, A0 et B0 étant les articulations des tiges 28 et 30. II correspond à la position horizontale de la plate-forme II, position pour laquelle la tige A0B0 est alignée avec l'axe de translation du mécanisme. Des détecteurs 50, 51, 52 (figure 2) déterminent les erreurs de convergence et de pureté visibles sur l'écran 101 et un calculateur (non représenté) permet, à partir de ces mesures, de déterminer les déplacements des point B0 qu'il faudra effectuer pour que le déviateur 10 se déplace afin que dans sa nouvelle position, après déplacement, les erreurs soient corrigées. Ainsi pour obtenir la correction il faut déplacer le point BO vers le point B (figure 5). A cet effet il faut déplacer le point AO en A par une translation du piston 32a. Bien entendu A0B0 = AB, le bras 25 ne changeant pas de longueur d'une position à une autre. Finalement le calculateur détermine si la translation A0A permet de corriger les erreurs mesurées. Bien entendu les déplacements A0A peuvent être progressifs.The first state of the rod 25 is represented by the segment A 0 B 0 , A 0 and B 0 being the articulations of the rods 28 and 30. It corresponds to the horizontal position of the platform II, position for which the rod A 0 B 0 is aligned with the axis of translation of the mechanism. Detectors 50, 51, 52 (FIG. 2) determine the convergence and purity errors visible on the screen 10 1 and a computer (not shown) makes it possible, from these measurements, to determine the displacements of the points B 0 qu 'It will be necessary for the deflector 10 to move so that in its new position, after displacement, the errors are corrected. So to get the correction you have to move point B O to point B (figure 5). For this purpose, point A O must be moved to A by a translation of the piston 32a. Of course A 0 B 0 = AB, the arm 25 does not change length from one position to another. Finally, the computer determines whether the translation A 0 A allows the measured errors to be corrected. Of course the displacements A 0 A can be progressive.

Par exemple si on désire déplacer le déviateur 10 selon l'axe vertical z les translations A0A seront toutes identiques.For example if one wishes to move the deflector 10 along the vertical axis z the translations A 0 A will all be identical.

L'appareil selon l'invention ne permet que des déplacements de faible amplitude du déviateur, ce qui est suffisant pour le réglage de la position de ce déviateur par rapport aux autres éléments du_tube de télévision en couleurs. Par rapport à trois axes orthonormés constitués par les axes habituels de symétrie d'un tube, l'appareil permet des rotations d'au maximum ±3° autour de chaque axe et des translations d'au maximum - 4 mm selon chacun de ces axes.The apparatus according to the invention allows only small amplitude displacements of the deflector, which is sufficient for adjusting the position of this deflector relative to the other elements of the color television tube. Compared to three orthonormal axes formed by the usual axes of symmetry of a tube, the device allows rotations of maximum ± 3 ° around each axis and translations of maximum - 4 mm along each of these axes .

Les diverses pièces de l'appareil ont un jeu négligeable. Il en est ainsi en particulier des articulations qui sont sans jeu. En outre, les jambes supportent la plate-forme 11 de façon très rigide. De cette manière, le positionnement de la plate-forme 11, et donc du déviateur 10, est toujours assuré de façon très précise.The various parts of the device have negligible play. This is particularly the case for the joints which are free of play. In addition, the legs support the platform 11 very rigidly. In this way, the positioning of the platform 11, and therefore of the diverter 10, is always ensured very precisely.

L'appareil s'adapte aisément aux divers types de déviateurs. Il peut également être utilisé avec un minimum de modifications pour le réglage de la position de déviateurs sur des tubes de dimensions et/ou de géométries différentes.The device easily adapts to various types of deflectors. It can also be used with a minimum of modifications for adjusting the position of deflectors on tubes of different sizes and / or geometries.

L'adaptabilité de l'appareil résulte de ses six degrés de liberté qui permettent tous les déplacements autour d'une position de référence. Pour passer d'une configuration de déviateur de tube à un autre, l'appareil n'a pas à subir de modification de structure ; il suffit de modifier les paramètres de calcul nécessaires pour assurer la commande des moteurs 34 qui déplacent le déviateur pour corriger les erreurs mesurées sur l'écran du tube.The adaptability of the device results from its six degrees of freedom which allow all movements around a reference position. To switch from one tube deflector configuration to another, the device does not have to undergo any structural modification; it suffices to modify the calculation parameters necessary to control the motors 34 which move the deflector to correct the errors measured on the screen of the tube.

Les transducteurs 37 permettent d'une part de connaître la position de chaque douille 31 et d'autre part, de vérifier qu'un déplacement commandé a bien été effectué.The transducers 37 make it possible on the one hand to know the position of each socket 31 and on the other hand, to verify that a controlled movement has indeed been carried out.

La fixation du déviateur sur le tube une fois les réglages réalisés peut,comme ces derniers, être effectué sans intervention manuelle par exemple à l'aide de tournevis automatiques.Fixing the diverter on the tube once the adjustments have been made can, like the latter, be carried out without manual intervention, for example using automatic screwdrivers.

Pour la mise au point du programme de commande des moteurs 34 à partir des erreurs mesurées sur l'écran, on procède à un étalonnage préalable de l'appareil en fonction du type de tube et de déviateur. Ainsi comme indiqué ci-dessus on calcule les déplacements du déviateur nécessaires pour compenser les erreurs mesurées en définissant six vecteurs BOB puis six translations AOA commandées par les moteurs 34.For the development of the motor control program 34 from the errors measured on the screen, a preliminary calibration of the apparatus is carried out according to the type of tube and deflector. Thus, as indicated above, the displacements of the deflector necessary to compensate for the measured errors are calculated by defining six vectors B O B then six translations A O A controlled by the motors 34.

La disposition oblique par rapport à la verticale et la répartition régulière autour de l'ouverture 12 des bras 17 à 22 permet de loger aisément sous la plate-forme 11 les moyens 50 d'alimentation du tube.The oblique arrangement with respect to the vertical and the regular distribution around the opening 12 of the arms 17 to 22 makes it possible to easily accommodate under the platform 11 the means 50 for feeding the tube.

Claims (12)

1.Appareil pour le réglage de la position d'un déviateur (10) par rapport à un tube de télévision (102), notamment en couleurs, en particulier pour que l'ensemble tube-déviateur soit autoconvergent, comprenant un support (11) mobile selon n degrés de liberté et n éléments (17 à 22),, tels que des bras, dont le déplacement de chacun est commandé selon un seul degré de liberté, par exemple une simple translation, pour assurer la mobilité du support (11) selon les n degrés de liberté, caractérisé en ce que tous les éléments dont la commande du déplacement est selon un seul degré de liberté sont de constitution identique, et en ce que le support comporte une plate-forme (11) qui est horizontale dans sa position moyenne et est portée par n bras (I7 à 22) obliques régulièrement répartis autour du déviateur dont chacun présente à sa base une commande (32, 33, 34) de déplacement en translation.1. Apparatus for adjusting the position of a deflector (10) relative to a television tube (102), in particular in color, in particular so that the tube-deflector assembly is self-converging, comprising a support (11) mobile according to n degrees of freedom and n elements (17 to 22) ,, such as arms, the movement of each of which is controlled according to a single degree of freedom, for example a simple translation, to ensure the mobility of the support (11) according to the n degrees of freedom, characterized in that all the elements whose movement control is according to a single degree of freedom are of identical constitution, and in that the support comprises a platform (11) which is horizontal in its medium position and is carried by n arms (I7 to 22) oblique regularly distributed around the deflector each of which has at its base a control (32, 33, 34) for displacement in translation. 2. Appareil selon la revendication 1, caractérisé en ce que le nombre n est égal à six. -2. Apparatus according to claim 1, characterized in that the number n is equal to six. - 3. Appareil selon la revendication 1 ou 2, caractérisé en ce que chaque bras comporte une tige rigide (25) dont une extrémité est articulée (28) à la plate-forme (11) et dont l'autre extrémité est - articulée (30) à un dispositif (31, 32, 33) effectuant de simples translations.3. Apparatus according to claim 1 or 2, characterized in that each arm comprises a rigid rod (25), one end of which is articulated (28) to the platform (11) and the other end of which is - articulated (30 ) to a device (31, 32, 33) performing simple translations. 4. Appareil selon la revendication 3, caractérisé en ce que chaque articulation (28,30) est constituée par une tige résistante et flexible encastrée de manière à constituer une rotule sans jeu.4. Apparatus according to claim 3, characterized in that each articulation (28,30) is constituted by a resistant and flexible rod embedded so as to constitute a ball joint without play. 5. Appareil selon la revendication 4, caractérisé en ce que chaque tige (28, 30) est du type corde à piano.5. Apparatus according to claim 4, characterized in that each rod (28, 30) is of the piano string type. 6. Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce que le nombre n étant égal à six, les articulations (28) des six bras à plate-forme (11) sont disposées sur une circonférence (45) au voisinage des sommets (46, 47, 48) d'un triangle équilatéral inscrit dans cette circonférence, la projection horizontale de chaque bras étant perpendiculaire au côté du triangle équilatéral auquel ce bras est adjacent.6. Apparatus according to any one of the preceding claims, characterized in that the number n being equal to six, the joints (28) of the six platform arms (11) are arranged on a circumference (45) in the vicinity of vertices (46, 47, 48) of an equilateral triangle inscribed in this circumference, the projection horizontal of each arm being perpendicular to the side of the equilateral triangle to which this arm is adjacent. 7. Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque bras forme, lorsque la plate-forme (11) est dans sa position médiane horizontale, un angle d'environ 45° avec la verticale, les directions de translation étant également selon cette direction.7. Apparatus according to any one of the preceding claims, characterized in that each arm forms, when the platform (11) is in its horizontal median position, an angle of approximately 45 ° with the vertical, the directions of translation also being in this direction. 8. Appareil selon l'une quelconque des revendications précédentes,caractérisé en ce que la commande du déplacement selon un seul degré de liberté de chacun desdits éléments (17 à 22) est . assurée par un moteur électrique, notamment du type pas à pas (34), entraînant une vis (33) qui entraîne elle même un piston (32) présentant un taraudage et qui est guidé pour se déplacer uniquement en translation.8. Apparatus according to any one of the preceding claims, characterized in that the control of movement according to a single degree of freedom of each of said elements (17 to 22) is. provided by an electric motor, in particular of the stepping type (34), driving a screw (33) which itself drives a piston (32) having a thread and which is guided to move only in translation. 9. Appareil selon l'une quelconque des revendivcations précédentes, caractérisé en ce qu'il comprend un dispositif (50, 51, 52,) de mesure des erreurs de déviation sur l'écran du tube, notamment les erreurs de convergence et de pureté pour un tube de télévision en couleurs, qui délivre des signaux d'erreur à un calculateur actionnant les moyens de commande selon un degré de liberté afin d'affectuer les corrections des erreurs.9. Apparatus according to any one of the preceding claims, characterized in that it comprises a device (50, 51, 52,) for measuring deviation errors on the screen of the tube, in particular convergence and purity errors for a color television tube, which delivers error signals to a computer actuating the control means according to a degree of freedom in order to carry out error corrections. -10. Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce que le sens de l'obliquité des bras est tel que ces bras s'éloignent de la plate-forme en partant de celle-ci.-10. Apparatus according to any one of the preceding claims, characterized in that the direction of the obliquity of the arms is such that these arms move away from the platform starting from the latter. 11. Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce que la plate-forme horizontale présente une ouverture centrale (12) formant logement de réception pour le déviateur (10).11. Apparatus according to any one of the preceding claims, characterized in that the horizontal platform has a central opening (12) forming a receiving housing for the diverter (10). 12. Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce que le déviateur (10) est fixé à la plate-forme grâce à des mors (13) coopérant avec la périphérie de la carcasse du déviateur.12. Apparatus according to any one of the preceding claims, characterized in that the deflector (10) is fixed to the platform by means of jaws (13) cooperating with the periphery of the carcass of the deflector.
EP84400761A 1983-04-26 1984-04-17 Apparatus for positioning a deflection unit on a television tube, especially a colour tube Expired EP0123613B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400761T ATE35879T1 (en) 1983-04-26 1984-04-17 DEVICE FOR THE SPATIAL ADJUSTMENT OF A DEFLECTION UNIT IN A TELEVISION TUBE, IN PARTICULAR IN A COLOR TELEVISION TUBE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8306834 1983-04-26
FR8306834A FR2545266B1 (en) 1983-04-26 1983-04-26 APPARATUS FOR ADJUSTING THE POSITION OF A DEVIATOR ON A TELEVISION TUBE, PARTICULARLY IN COLOR

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EP0123613A2 true EP0123613A2 (en) 1984-10-31
EP0123613A3 EP0123613A3 (en) 1986-03-26
EP0123613B1 EP0123613B1 (en) 1988-07-20

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US (1) US4638219A (en)
EP (1) EP0123613B1 (en)
JP (1) JPS59207550A (en)
AT (1) ATE35879T1 (en)
DE (1) DE3472857D1 (en)
FR (1) FR2545266B1 (en)

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EP0219467A2 (en) * 1985-10-08 1987-04-22 Plessey S.p.A. Société dite: System for correcting the geometry of the image resulting from the assembling of the deflection yoke on a cathode rays kinescope
US4850921A (en) * 1985-12-04 1989-07-25 Hitachi, Ltd. Full automatic total inspection system for implosion-protected cathode-ray tube
US4925420A (en) * 1987-02-13 1990-05-15 Videocolor Method for the automatic measurement of convergence and for the determination of corrections to be made in trichromatic cathode tube deflectors and machine for the application of this method
US4971588A (en) * 1988-02-19 1990-11-20 Hitachi, Ltd. Position adjusting method for deflecting yoke

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US4760457A (en) * 1986-04-30 1988-07-26 Rca Licensing Corporation Self-fixtured kinescope
FR2606550B1 (en) * 1986-11-12 1989-01-13 Videocolor METHOD AND DEVICE FOR ADJUSTING THE STATIC CONVERGENCE AND / OR THE PURITY OF A COLORED TELEVISION TUBE
US5043823A (en) * 1990-06-22 1991-08-27 Hughes Aircraft Company Cathode ray tube focus coil alignment and assembly arrangement
TW333368U (en) * 1992-04-21 1998-06-01 Toshiba Co Ltd Image tube apparatus
IT1286905B1 (en) * 1996-12-20 1998-07-17 Spemac Srl AUTOMATIC PLACEMENT MECHANISM

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
EP0219467A2 (en) * 1985-10-08 1987-04-22 Plessey S.p.A. Société dite: System for correcting the geometry of the image resulting from the assembling of the deflection yoke on a cathode rays kinescope
EP0219467A3 (en) * 1985-10-08 1987-12-16 Plessey S.p.A. Société dite: System for correcting the geometry of the image resulting from the assembling of the deflection yoke on a cathode rays kinescope
US4850921A (en) * 1985-12-04 1989-07-25 Hitachi, Ltd. Full automatic total inspection system for implosion-protected cathode-ray tube
US4925420A (en) * 1987-02-13 1990-05-15 Videocolor Method for the automatic measurement of convergence and for the determination of corrections to be made in trichromatic cathode tube deflectors and machine for the application of this method
US4971588A (en) * 1988-02-19 1990-11-20 Hitachi, Ltd. Position adjusting method for deflecting yoke

Also Published As

Publication number Publication date
FR2545266A1 (en) 1984-11-02
EP0123613B1 (en) 1988-07-20
DE3472857D1 (en) 1988-08-25
ATE35879T1 (en) 1988-08-15
US4638219A (en) 1987-01-20
JPS59207550A (en) 1984-11-24
EP0123613A3 (en) 1986-03-26
FR2545266B1 (en) 1985-12-27

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