EP1098349A1 - Shadow mask-frame assembly for cathode ray tube - Google Patents

Shadow mask-frame assembly for cathode ray tube Download PDF

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Publication number
EP1098349A1
EP1098349A1 EP00403034A EP00403034A EP1098349A1 EP 1098349 A1 EP1098349 A1 EP 1098349A1 EP 00403034 A EP00403034 A EP 00403034A EP 00403034 A EP00403034 A EP 00403034A EP 1098349 A1 EP1098349 A1 EP 1098349A1
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EP
European Patent Office
Prior art keywords
mask
cathode ray
ray tube
tube according
resonator
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
EP00403034A
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German (de)
French (fr)
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EP1098349B1 (en
Inventor
Fabrizio Berton
Pierluigi Testa
Joseph Artur Reed
Renzo Incagli
Pedro E. Cosma
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Videocolor SpA
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Videocolor SpA
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Publication date
Priority claimed from IT1999MI002324A external-priority patent/IT1313924B1/en
Priority claimed from IT2000MI001480A external-priority patent/IT1318092B1/en
Application filed by Videocolor SpA filed Critical Videocolor SpA
Publication of EP1098349A1 publication Critical patent/EP1098349A1/en
Application granted granted Critical
Publication of EP1098349B1 publication Critical patent/EP1098349B1/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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0727—Aperture plate
    • H01J2229/0738—Mitigating undesirable mechanical effects
    • H01J2229/0744—Vibrations

Definitions

  • the present invention relates to a mask structure for selecting colors for cathode ray tube in colors
  • the invention finds its application in any type of tube including a mask for selecting colors and is more particularly suitable for tubes whose mask is held in tension by the frame on which it is secured.
  • the color selection mask must be placed and maintained during the operation of the tube in a precise position inside the tube.
  • the mask holding functions are carried out thanks to a metal frame generally very rigid rectangular on which the mask is conventionally welded.
  • the frame / mask assembly is mounted in the face front of the tube by means of suspension most often welded to the frame and cooperating with pins inserted in the glass constituting the face front of the tube.
  • the tubes whose front face is increasingly planar correspond to the current trend, with an evolution towards totally flat front panels.
  • the color selection mask consisting of a metal sheet very thin, its tensioning can cause phenomena parasite for vibrating said mask during operation of the tube. Under the influence of shock or external mechanical vibrations, for example acoustic vibrations from the TV speakers in which the tube is inserted, the mask can vibrate according to its natural frequency of resonance.
  • the vibrations of the mask have the effect of modifying the landing zone of electron beams on the screen of the tube, the points impact of each beam then being offset with respect to the network of associated luminophore, thus creating a discoloration of the image reproduced on the screen.
  • a cathode ray tube 1 comprises a substantially flat slab 2 and a peripheral skirt 3.
  • the slab is connected to the rear part of the tube, funnel-shaped 4 thanks to a sealing by sintered glass.
  • the end part of the tube 5 surrounds the barrel 6 electrons whose beams light up the phosphor screen luminescent 13 through the color selection mask 8, which is here plane, for example stretched between the long sides 9 of the frame 19.
  • Supports frame / mask assembly hold this assembly to inside the tube, said supports being able to comprise a part 10 welded to the frame and a spring portion 11, provided with an opening for cooperation with a pin 12 included in the glass skirt 3.
  • the frame 19 includes a pair of long sides 9 and a pair of short sides 7, said sides long and short sides having for example an L-shaped section.
  • the mask 8 itself substantially rectangular in shape, tensioned, then held in this state for example by welding on the end 20 of said long sides of the frame.
  • the mask consists of a metal sheet, for example of steel or Invar, very thin, around 100 ⁇ m.
  • the mask has a central zone 30 pierced with openings generally arranged in columns and a peripheral zone 28 surrounding the central zone with edges horizontal 31 and vertical 32.
  • Cathode ray tube structures using selection masks colors in tension have to face the vibration problem of this mask, according to its own modes, when said mask is excited by external vibrations, for example mechanical shocks on the tube or sound vibrations from nearby speakers of the tube.
  • vibrations manifested by movements of the following mask a direction perpendicular to its surface, the distance between the openings of the mask and the screen varies locally depending on the amplitude of the vibration said mask.
  • the purity of the colors reproduced on the screen is then no longer guaranteed, the beam landing points on the screen being offset in as a function of the amplitude of the vibration.
  • the vibrations of the mask are only very damped slowly, the energy communicated to the mask having few means of dissipation, which increases the visibility of the phenomenon on the screen when the tube is in operation.
  • the invention provides a simple, economical structure which is easy to set up. work to dampen the vibrations of a mask stretched in one or two directions.
  • FIG. 5 is a perspective view of a first embodiment of the invention, suitable for a mask stretched in one direction, for example parallel to its short sides 32.
  • a damping device 55 is arranged in the form of strip, for example metallic, comprising a central part 51 secured on the surface of the edge of the mask, for example by welding, and two wings 50 extending on either side of this central part.
  • the device damping 55 can be made in one piece by cutting a metal strip and stamping or in two identical connected pieces between them at the level of the central part 51.
  • the damping device 55 will form with the mask a system of coupled oscillators; the parameters of the damping device 55 like the length of the wings 50, their thickness and their weight are chosen in a conventional manner so that the natural frequency of vibration of the device 55 is close to a chosen value, for example the natural resonance frequency of the mask so that the vibrations of the damping device 55 come to escape the mask vibrations.
  • the frame / mask device When the frame / mask device is such that the mask has a part openwork 30 with column openings interconnected by bridges metallic, that the tension exerted on the mask is uni axial, following by example the direction of the short sides 32, the long sides being welded to the edges 20 of the long sides 9 of the frame, the behavior of the mask in vibration conforms to Figure 4; the vibration amplitude of the mask is maximum at middle of the short sides 32.
  • a shock absorber according to the invention in the middle of each of the two short sides of the mask.
  • the invention provides a structure enabling simple implementation of means of dissipating the energy communicated to the mask upon impact of the tube or through strong sound waves. Indeed, it is necessary to avoid than the vibrations communicated to the mask, even if they are weak amplitude, do not last too long because they become visible during the operation of the tube. As the mask is found inside the tube in a very high vacuum, it is necessary to add means of dissipation energy for the mask to absorb quickly. It is for example advantageous that a portion 52 of the wing 50 come into contact with the mask when it tends to vibrate.
  • the vibration energy is then dissipated by friction between the parts 52 of the shock absorber wing and the surface of the mask, as shown by Figure 6 illustrating a side view of the frame / mask according to the invention.
  • the wing shape of the device 55 allows maximum dissipation of energy by friction by arranging the parts 52 so as to come into contact of the mask near areas of low vibration amplitude, for example at level of the ends of the wings 50; the central part of the shock absorber 55 being arranged in the zone of maximum amplitude of vibration of the mask, the part 52 of the wing will then rub on the mask over an area of considerable length, proportional to the height 53 of the wing measured in relation to the plane of the mask.
  • Figure 8 shows, in a perspective view, the detail of the end of the wing 50 according to another embodiment; this end 52 comes to sandwich the edge 32 of the mask so as to increase the friction surface between said end 52 and the surface of the mask to dissipate more quickly the vibration energy of the mask.
  • rivets are arranged so as to cross the wings 50 through orifices 61 formed thereon, the heads of the rivets having a dimension greater than that of the orifices then that the body of the rivet has a section less than the diameter of said orifice.
  • the arrangement of the coupled oscillators 55 along the short sides 32 of the mask is not limiting. For example in the case where the mask is stretched in two directions parallel to its length and width, it is advantageous to arrange the vibration dampers according to the invention both along the horizontal and vertical edges of said mask.
  • the damping oscillators according to the invention can indifferently be placed on the surface of the mask facing the screen of phosphors or vice versa on the surface of the mask on the electron gun side. he can also be advantageous to have the shock absorbers 55 on both sides of the mask in order to obtain the desired damping effect.
  • Positioning means of the coupled oscillator 55 on the surface of the mask can be added without complex modification of the structure of said oscillator or the mask itself. These means are intended to facilitate the positioning of the coupled oscillator on the edge of the mask during tube manufacturing process. As illustrated in FIG. 7, these means of positioning can be constituted by a tongue 65 integral with the oscillator 55 cooperating with a notch 66 located on the edge of the mask 8. Alternatively the tongue can be secured to the mask and the notch located on the central part 51 of the oscillator 55.
  • the positioning means may consist of a boss intended to be inserted into an opening adapted; the boss can indifferently be placed on the mask and it then cooperates with an opening disposed on the central part 51 of the oscillator, or else the boss is disposed on the surface of the oscillator 55, for example on its central part 51 and it then cooperates with an opening arranged on the edge of the mask 8.
  • the shock absorber on the edge of the mask and the amplitude of the vibration of it, it can happen that the moving part 50 of the shock absorber goes to the other side of the mask and comes to hang on the edge 62 thereof.
  • the damper thus immobilized no longer fulfills its function.
  • FIG. 9 illustrates an embodiment of the invention avoiding the appearance of this problem.
  • Guide means 68 are arranged at the level of the free part 50 of the flexible metal strip constituting the vibration damper 55, near the edge 62 of the mask 8. These means have here the shape of a tongue, forming a non-zero angle with the surface of the mask, preferably of the order of 90 °, so as to extend from the side of the mask on which is the vibration damper 55.
  • This tongue 68 has a height sufficient to prevent the free part 50 from passing over and coming block on the edge 62.
  • the tabs 68 can form with the mask a unitary piece being made when the mask is cut and folded thereafter, or they can be additional pieces, joined together mask later, for example by welding.
  • FIG. 10 illustrates another embodiment of the invention in which the guide means 70 comprises a tongue 70 secured to the frame 19, for example by welding at 71.
  • This tongue is also disposed at the free part 50 of the damper 55 and extends towards the edge 62 of the mask with a height on the side of the mask, where is the damper 50, sufficient so as to prevent the free part 50 from being able to go to the other side of the mask when it vibrates.
  • FIG. 11 illustrates an embodiment of the invention in which the guide means have the form of a tongue 80, one end of which is secured to the frame at 81.
  • the other end 82 surrounds, at least partially the free part 50 of the shock absorber 55, thus ensuring guiding improved, in particular preventing the free part 55 from rubbing against the openwork effective area 30 of the mask.
  • the invention has the additional advantage of offering means additional energy dissipation allowing the mask to absorb more quickly. Indeed, it is advantageous that part of the wing 50 come to the contact of the guide means when the mask and the shock absorbers 55 tend to vibrate. The vibration energy is then dissipated by friction between the parties in contact. Metal collars 60 can advantageously come complete the dissipation of energy by friction.
  • damping oscillators 55 can equally be arranged on the surface of the mask facing the phosphor screen or inversely on the surface of the mask on the electron gun side. He can be also advantageous to have the shock absorbers 55 on both sides of the mask in order to obtain the desired damping effect.
  • the invention and the means guides described adapt to all these different cases.

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  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

The cathode ray tube frame mask structure has a mask colour selector (8) made of a rectangular metallic foil tensioned on a fixed frame support inside the front tube face. There is a resonator (55) which is a flexible band with a section (51) fixed on the peripheral zone (28) and with two outer sections (50) extending from the central point.

Description

La présente invention concerne une structure de masque de sélection des couleurs pour tube à rayons cathodiques en couleurs L'invention trouve son application dans tout type de tube comportant un masque de sélection de couleurs et est plus particulièrement adaptée aux tubes dont le masque est maintenu en tension par le cadre sur lequel il est solidarisé.The present invention relates to a mask structure for selecting colors for cathode ray tube in colors The invention finds its application in any type of tube including a mask for selecting colors and is more particularly suitable for tubes whose mask is held in tension by the frame on which it is secured.

Les tubes à rayons cathodiques conventionnels comportent un masque de sélection des couleurs situé à une distance précise de l'intérieur de la face avant en verre du tube, face avant sur laquelle sont déposés des réseaux de luminophores rouges, verts et bleus pour former un écran. Un canon à électrons disposé à l'intérieur du tube, dans sa partie arrière, génère trois faisceaux électroniques en direction de la face avant. Un dispositifs de déflexion électromagnétique, généralement disposé à l'extérieur du tube et proche du canon à électrons a pour fonction de dévier les faisceaux électroniques afin de leur faire balayer la surface du panneau sur laquelle sont disposés les réseaux de luminophores. Sous l'influence de trois faisceaux électroniques correspondants chacun à une couleur primaire déterminée, les réseaux de luminophores permettent la reproduction d'images sur l'écran, le masque permettant à chaque faisceau déterminé de n'illuminer que le luminophore de la couleur correspondante.Conventional cathode ray tubes have a mask selection of colors located at a precise distance from the inside of the face glass front of the tube, front face on which networks of red, green and blue phosphors to form a screen. A cannon electrons arranged inside the tube, in its rear part, generates three electronic harnesses towards the front face. Deflection devices electromagnetic, generally placed outside the tube and close to the electron gun has the function of deflecting the electron beams in order to make them sweep the surface of the panel on which the networks are arranged phosphors. Under the influence of three electron beams each corresponding to a specific primary color, the networks of phosphors allow the reproduction of images on the screen, the mask allowing each determined beam to illuminate only the luminophore of the corresponding color.

Le masque de sélection des couleurs doit être disposé et maintenu pendant le fonctionnement du tube dans une position précise à l'intérieur du tube. Les fonctions de maintien du masque sont réalisées grâce à un cadre métallique rectangulaire généralement très rigide sur lequel le masque est conventionnellement soudé. L'ensemble cadre/masque est monté dans la face avant du tube grâce des moyens de suspension le plus souvent soudés sur le cadre et coopérant avec des pions insérés dans le verre constituant la face avant du tube.The color selection mask must be placed and maintained during the operation of the tube in a precise position inside the tube. The mask holding functions are carried out thanks to a metal frame generally very rigid rectangular on which the mask is conventionally welded. The frame / mask assembly is mounted in the face front of the tube by means of suspension most often welded to the frame and cooperating with pins inserted in the glass constituting the face front of the tube.

Les tubes dont la face avant est de plus en plus plane correspondent à la tendance actuelle, avec une évolution vers des faces avant totalement planes. The tubes whose front face is increasingly planar correspond to the current trend, with an evolution towards totally flat front panels.

Pour réaliser des tubes comportant une telle face avant, il est une technologie consistant à utiliser un masque plan, maintenu en tension suivant au moins une direction. De telles structures sont décrites par exemple dans le brevet américain US4827179.To make tubes with such a front face, it is a technology consisting in using a plane mask, maintained in tension according to at least one direction. Such structures are described for example in the patent American US4827179.

Le masque de sélection des couleurs étant constitué par une feuille métallique de très faible épaisseur, sa mise en tension peut engendrer des phénomènes parasite de mise en vibration du dit masque lors du fonctionnement du tube . Sous l'influence de choc ou de vibrations mécaniques extérieures, par exemple des vibrations acoustiques dues aux haut-parleurs du téléviseur dans lequel le tube est inséré, le masque peut entrer en vibration suivant sa fréquence propre de résonance. Les vibrations du masque ont pour conséquence de modifier la zone d'atterrissage des faisceaux d'électrons sur l'écran du tube, les points d'impact de chaque faisceau étant alors décalés par rapport au réseau de luminophore associé , créant ainsi une décoloration de l'image reproduite sur l'écran.The color selection mask consisting of a metal sheet very thin, its tensioning can cause phenomena parasite for vibrating said mask during operation of the tube. Under the influence of shock or external mechanical vibrations, for example acoustic vibrations from the TV speakers in which the tube is inserted, the mask can vibrate according to its natural frequency of resonance. The vibrations of the mask have the effect of modifying the landing zone of electron beams on the screen of the tube, the points impact of each beam then being offset with respect to the network of associated luminophore, thus creating a discoloration of the image reproduced on the screen.

Les masques ayant une surface effective plane, en particulier dans le cas ou le masque est maintenu en tension par le cadre, présentent une grande sensibilité aux vibrations de leur environnement nécessitant l'utilisation de moyens d'amortissement pour éviter que le masque ne rentre en vibration. Le brevet US4827179 propose d'ajouter sur une face du masque des moyens d'amortissement de la vibration du masque. Cependant les dispositif d'amortissements mis en oeuvre dans ce brevet ont une structure compliquée, difficile à mettre en oeuvre.Masks having a flat effective surface, in particular in the case where the mask is held in tension by the frame, have great sensitivity to vibrations in their environment requiring the use of damping means to prevent the mask from entering into vibration. US Pat. No. 4,827,179 proposes adding means to one face of the mask vibration damping of the mask. However the devices of depreciation used in this patent have a complicated structure, difficult to implement.

C'est un objet de ladite invention de proposer un tube à rayons cathodique comprenant une structure de masque avec des moyens d'amortissement simples et peu coûteux..It is an object of said invention to provide a cathode ray tube comprising a mask structure with damping means simple and inexpensive ..

Pour cela, le tube à rayons cathodiques selon l'invention comprend :

  • un masque de sélection des couleurs sous forme d'une feuille métallique sensiblement rectangulaire, adapté pour être fixé en tension sur un cadre support et monté à l'intérieur de la face avant du tube, ledit masque comportant une zone centrale percée d'orifices et une zone périphérique, disposée entre la zone centrale et les bords du masque, ledit masque étant susceptible de vibrer indépendamment du cadre support
  • des moyens d'amortissement de vibrations du masque disposés à ladite périphérie du masque pour amortir les vibrations dans ledit masque,
  • les moyens d'amortissement étant caractérisés en ce qu'ils comportent un résonateur sous forme de bande métallique flexible dont une partie est fixée sur une surface de la zone périphérique du masque avec deux ailes s'étendant de part et d'autre de cette partie centrale.
For this, the cathode ray tube according to the invention comprises:
  • a color selection mask in the form of a substantially rectangular metal sheet, adapted to be fixed in tension on a support frame and mounted inside the front face of the tube, said mask comprising a central zone pierced with orifices and a peripheral zone, arranged between the central zone and the edges of the mask, said mask being capable of vibrating independently of the support frame
  • means for damping vibrations of the mask arranged at said periphery of the mask to damp vibrations in said mask,
  • the damping means being characterized in that they comprise a resonator in the form of a flexible metal strip, part of which is fixed to a surface of the peripheral zone of the mask with two wings extending on either side of this part central.

L'invention sera mieux comprise à l'aide de la description ci-après et des dessins parmi lesquels :

  • la figure 1 représente un tube à rayons cathodiques selon l'invention vu partiellement en éclaté
  • la figure 2 décrit un ensemble cadre/masque tendu suivant l'état de la technique sans amortisseur de vibration
  • la figure 3 est une vue en perspective d'un mode de réalisation d'un dispositif d'amortissement de vibration selon l'état de la technique.
  • la figure 4 illustre le profil de déplacement de la surface d'un masque tendu soumis à des vibrations
  • les figures 5 à 8 illustrent différents modes de réalisation de l'invention.
  • Les figures 9 à 11 illustrent des modes de réalisation incorporant en outre des moyens de guidage des déplacements d'un dispositif d'amortissement selon l'invention
The invention will be better understood using the following description and the drawings, among which:
  • Figure 1 shows a cathode ray tube according to the invention seen partially in exploded view
  • FIG. 2 describes a frame / mask assembly stretched according to the state of the art without vibration damper
  • Figure 3 is a perspective view of an embodiment of a vibration damping device according to the prior art.
  • FIG. 4 illustrates the displacement profile of the surface of a tensioned mask subjected to vibrations
  • Figures 5 to 8 illustrate different embodiments of the invention.
  • Figures 9 to 11 illustrate embodiments further incorporating means for guiding the movements of a damping device according to the invention

Comme illustré par la figure 1, un tube à rayons cathodiques 1 selon l'invention comprend une dalle sensiblement plane 2 et une jupe périphérique 3. La dalle est reliée à la partie arrière du tube, en forme d'entonnoir 4 grâce à un scellement par verre fritté. La partie d'extrémité du tube 5 entoure le canon à électrons 6 dont les faisceaux viennent illuminer l'écran de phosphores luminescent 13 au travers du masque de sélection des couleurs 8, qui est ici plan, par exemple tendu entre les cotés longs 9 du cadre 19. Des supports métalliques de l'ensemble cadre/masque maintiennent cet ensemble à l'intérieur du tube, lesdits supports pouvant comporter une partie 10 soudée au cadre et une partie formant ressort 11, pourvue d'une ouverture pour coopérer avec un pion 12 inclus dans la jupe en verre 3.As illustrated in FIG. 1, a cathode ray tube 1 according to the invention comprises a substantially flat slab 2 and a peripheral skirt 3. The slab is connected to the rear part of the tube, funnel-shaped 4 thanks to a sealing by sintered glass. The end part of the tube 5 surrounds the barrel 6 electrons whose beams light up the phosphor screen luminescent 13 through the color selection mask 8, which is here plane, for example stretched between the long sides 9 of the frame 19. Supports frame / mask assembly hold this assembly to inside the tube, said supports being able to comprise a part 10 welded to the frame and a spring portion 11, provided with an opening for cooperation with a pin 12 included in the glass skirt 3.

Dans l'exemple de l'état de la technique illustré par la figure 2 , le cadre 19, comprend une paire de cotés longs 9 et une paire de cotés courts 7 , lesdits cotés longs et courts ayant par exemple une section en L . Le masque 8, lui-même de forme sensiblement rectangulaire, est mis en tension , puis maintenu dans cet état par exemple par soudure sur l'extrémité 20 desdits cotés longs du cadre.In the example of the state of the art illustrated in FIG. 2, the frame 19, includes a pair of long sides 9 and a pair of short sides 7, said sides long and short sides having for example an L-shaped section. The mask 8, itself substantially rectangular in shape, tensioned, then held in this state for example by welding on the end 20 of said long sides of the frame.

Le masque est constitué d'une feuille métallique , par exemple en acier ou en Invar, de très faible épaisseur, de l'ordre de 100µm. Le masque possède une zone centrale 30 percée d'ouvertures généralement disposées en colonnes et une zone périphérique 28 entourant la zone centrale avec des bords horizontaux 31 et verticaux 32 .The mask consists of a metal sheet, for example of steel or Invar, very thin, around 100µm. The mask has a central zone 30 pierced with openings generally arranged in columns and a peripheral zone 28 surrounding the central zone with edges horizontal 31 and vertical 32.

Les structures de tubes à rayons cathodiques utilisant des masque de sélection des couleurs mis en tension ont à faire face au problème de vibration de ce masque, suivant des modes qui lui sont propres , lorsque ledit masque est excité par des vibrations extérieures, par exemple des chocs mécaniques sur le tube ou des vibrations sonores provenant de haut parleurs disposés à proximité du tube. Ces vibrations se manifestant par des mouvements du masque suivant une direction perpendiculaire à sa surface, la distance entre les ouvertures du masque et l'écran varie localement en fonction de l'amplitude de la vibration dudit masque. La pureté des couleurs reproduites sur l'écran n'est alors plus garantie, les point d'atterrissage des faisceaux sur l'écran étant décalés en fonction de l'amplitude de la vibration.Cathode ray tube structures using selection masks colors in tension have to face the vibration problem of this mask, according to its own modes, when said mask is excited by external vibrations, for example mechanical shocks on the tube or sound vibrations from nearby speakers of the tube. These vibrations manifested by movements of the following mask a direction perpendicular to its surface, the distance between the openings of the mask and the screen varies locally depending on the amplitude of the vibration said mask. The purity of the colors reproduced on the screen is then no longer guaranteed, the beam landing points on the screen being offset in as a function of the amplitude of the vibration.

Par ailleurs, comme le masque est disposé à l'intérieur du tube dans lequel règne un vide poussé, les vibrations du masque ne s'amortissent que très lentement, l'énergie communiquée au masque ayant peu de moyens de dissipation, ce qui augmente la visibilité du phénomène sur l'écran lorsque le tube est en fonctionnement.Furthermore, since the mask is placed inside the tube in which there is a high vacuum, the vibrations of the mask are only very damped slowly, the energy communicated to the mask having few means of dissipation, which increases the visibility of the phenomenon on the screen when the tube is in operation.

Comme illustré par la figure 3, le brevet américain US4827179 propose une solution pour amortir les vibrations du masque par un dispositif 41 formant oscillateur couplé, en disposant sur les bords du masque 8, à proximité de la zone où le masque est soudé au cadre 40, une structure mécanique comportant un support rigide 42 auquel est soudée au moins une lame souple 43 . La fréquence propre de résonance du dispositif 41 est choisi de manière à amortir les vibrations du masque dans une bande de fréquence déterminée. Cependant cette structure présente un certain nombre de désavantages :

  • elle est complexe et coûteuse du fait du nombre important de pièces métalliques utilisées ( support et lames flexibles)
  • à la structure d'amortissement, on doit adjoindre des éléments dissipateurs d'énergie si on veut que les vibrations du masque s'amortissent rapidement.
As illustrated in FIG. 3, the American patent US4827179 proposes a solution for damping the vibrations of the mask by a device 41 forming a coupled oscillator, by arranging on the edges of the mask 8, near the zone where the mask is welded to the frame 40 , a mechanical structure comprising a rigid support 42 to which at least one flexible blade 43 is welded. The natural resonance frequency of the device 41 is chosen so as to dampen the vibrations of the mask in a determined frequency band. However, this structure has a number of disadvantages:
  • it is complex and expensive due to the large number of metal parts used (support and flexible blades)
  • energy dissipating elements must be added to the damping structure if the vibrations of the mask are to be quickly damped.

L'invention propose une structure simple, économique, et facile à mettre en oeuvre pour amortir les vibrations d'un masque tendu suivant une ou deux directions.The invention provides a simple, economical structure which is easy to set up. work to dampen the vibrations of a mask stretched in one or two directions.

La figure 5 est une vue en perspective d'un premier mode de réalisation de l'invention, adapté à un masque tendu suivant une seule direction, par exemple parallèle à ses cotés courts 32.FIG. 5 is a perspective view of a first embodiment of the invention, suitable for a mask stretched in one direction, for example parallel to its short sides 32.

Dans la partie périphérique 28 du masque 8, par exemple le long de ses cotés courts verticaux 32, est disposé un dispositif d'amortissement 55 sous forme de bande, par exemple métallique, comprenant une partie centrale 51 solidarisée à la surface du bord du masque, par exemple par soudure, et deux ailes 50 s'étendant de part et d'autre de cette partie centrale. Le dispositif d'amortissement 55 peut être ainsi réalisé en une seule pièce par découpe d'une bande métallique et emboutissage ou en deux pièces identiques reliées entre elles au niveau de la partie centrale 51. Le dispositif d'amortissement 55 va former avec le masque un système d'oscillateurs couplés; les paramètres du dispositif d'amortissement 55 comme la longueur des ailes 50 , leur épaisseur et leur poids sont choisis de manière conventionnelle de façon à ce que la fréquence propre de vibration du dispositif 55 soit proche d'une valeur choisie, par exemple la fréquence propre de résonance du masque de manière à ce que les vibrations du dispositif d'amortissement 55 viennent se soustraire aux vibrations du masque .In the peripheral part 28 of the mask 8, for example along its sides vertical courts 32, a damping device 55 is arranged in the form of strip, for example metallic, comprising a central part 51 secured on the surface of the edge of the mask, for example by welding, and two wings 50 extending on either side of this central part. The device damping 55 can be made in one piece by cutting a metal strip and stamping or in two identical connected pieces between them at the level of the central part 51. The damping device 55 will form with the mask a system of coupled oscillators; the parameters of the damping device 55 like the length of the wings 50, their thickness and their weight are chosen in a conventional manner so that the natural frequency of vibration of the device 55 is close to a chosen value, for example the natural resonance frequency of the mask so that the vibrations of the damping device 55 come to escape the mask vibrations.

Lorsque le dispositif cadre/masque est tel que le masque possède une partie ajourée 30 avec des ouvertures en colonnes reliées entre elles par des ponts métalliques , que la tension exercée sur le masque est uni axiale, suivant par exemple la direction des cotés courts 32, les cotés longs étant soudés sur les bords 20 des cotés longs 9 du cadre, le comportement du masque en vibration est conforme à la figure 4; l'amplitude de vibration du masque est maximale au niveau du milieu des cotés courts 32. Pour un tube incorporant un cadre masque du type décrit ci-dessus, il est donc avantageux de disposer un amortisseur selon l'invention au milieu de chacun des deux cotés courts du masque.When the frame / mask device is such that the mask has a part openwork 30 with column openings interconnected by bridges metallic, that the tension exerted on the mask is uni axial, following by example the direction of the short sides 32, the long sides being welded to the edges 20 of the long sides 9 of the frame, the behavior of the mask in vibration conforms to Figure 4; the vibration amplitude of the mask is maximum at middle of the short sides 32. For a tube incorporating a frame mask of the type described above, it is therefore advantageous to have a shock absorber according to the invention in the middle of each of the two short sides of the mask.

L'invention offre une structure permettant de mettre en oeuvre simplement des moyens de dissipation de l'énergie communiquée au masque lors de choc du tube ou par l'intermédiaire d'ondes sonores puissantes. En effet, il faut éviter que les vibrations communiquées au masque, même si elles sont de faible amplitude, ne durent trop longtemps car elles deviennent alors visibles pendant le fonctionnement du tube. Comme le masque se retrouve à l'intérieur du tube dans un vide très poussé, il est nécessaire d'ajouter des moyens de dissipation de l'énergie pour que le masque s'amortisse rapidement. Il est par exemple avantageux qu'une partie 52 de l'aile 50 viennent au contact du masque lorsque celui-ci tend à vibrer. L'énergie de vibration est alors dissipée par friction entre les parties 52 de l'aile de l'amortisseur et la surface du masque, comme montré par la figure 6 illustrant une vue de coté du cadre/masque selon l'invention. La forme en aile du dispositif 55 permet d'obtenir le maximum de dissipation d'énergie par friction en disposant les partie 52 de manière à venir au contact du masque près des zones d'amplitude de vibration faible, par exemple au niveau des extrémités des ailes 50; la partie centrale de l'amortisseur 55 étant disposée dans la zone d'amplitude maximum de vibration du masque, la partie 52 de l'aile va alors frotter sur le masque sur une zone de longueur importante, proportionnelle à la hauteur 53 de l'aile mesurée par rapport au plan du masque.The invention provides a structure enabling simple implementation of means of dissipating the energy communicated to the mask upon impact of the tube or through strong sound waves. Indeed, it is necessary to avoid than the vibrations communicated to the mask, even if they are weak amplitude, do not last too long because they become visible during the operation of the tube. As the mask is found inside the tube in a very high vacuum, it is necessary to add means of dissipation energy for the mask to absorb quickly. It is for example advantageous that a portion 52 of the wing 50 come into contact with the mask when it tends to vibrate. The vibration energy is then dissipated by friction between the parts 52 of the shock absorber wing and the surface of the mask, as shown by Figure 6 illustrating a side view of the frame / mask according to the invention. The wing shape of the device 55 allows maximum dissipation of energy by friction by arranging the parts 52 so as to come into contact of the mask near areas of low vibration amplitude, for example at level of the ends of the wings 50; the central part of the shock absorber 55 being arranged in the zone of maximum amplitude of vibration of the mask, the part 52 of the wing will then rub on the mask over an area of considerable length, proportional to the height 53 of the wing measured in relation to the plane of the mask.

La figure 8 montre, dans une vue en perspective, le détail de l'extrémité de l'aile 50 selon un autre mode de réalisation; cette extrémité 52 vient sandwicher le bord 32 du masque de manière à augmenter la surface de frottement entre ladite extrémité 52 et la surface du masque pour dissiper plus rapidement l'énergie de vibration du masque.Figure 8 shows, in a perspective view, the detail of the end of the wing 50 according to another embodiment; this end 52 comes to sandwich the edge 32 of the mask so as to increase the friction surface between said end 52 and the surface of the mask to dissipate more quickly the vibration energy of the mask.

Pour diminuer le temps d'oscillation du masque 8 il est possible comme illustré par la vue en perspective de la figure 7, d'adjoindre à l'aile d'un amortisseur 55, au moins un collier métallique 60 traversant un orifice 61 pratiqué dans ladite aile. Le collier peut être ouvert ou fermé, sa section étant légèrement inférieure au diamètre de l'orifice 61 de manière à pouvoir se mouvoir dans cet orifice et dissiper l'énergie par friction sur le bord du dit orifice.To decrease the oscillation time of the mask 8 it is possible as illustrated by the perspective view of FIG. 7, of adding to the wing of a shock absorber 55, at least one metal collar 60 passing through an orifice 61 formed in said wing. The collar can be opened or closed, its section being slightly smaller to the diameter of the orifice 61 so as to be able to move in this orifice and dissipating energy by friction on the edge of said orifice.

Dans un autre mode de réalisation non représenté, des rivets sont disposés de manière à traverser les ailes 50 au travers d'orifices 61 pratiqués sur celles-ci, les tètes des rivets ayant une dimension supérieure à celle des orifices alors que le corps du rivet a une section inférieure au diamètre dudit orifice. La disposition des oscillateurs couplés 55 le long des cotés courts 32 du masque n'est pas limitative. Par exemple dans le cas ou le masque est tendu suivant deux directions parallèles à sa longueur et sa largeur, il est avantageux de disposer les amortisseurs de vibration selon l'invention à la fois le long des bords horizontaux et verticaux dudit masque.In another embodiment not shown, rivets are arranged so as to cross the wings 50 through orifices 61 formed thereon, the heads of the rivets having a dimension greater than that of the orifices then that the body of the rivet has a section less than the diameter of said orifice. The arrangement of the coupled oscillators 55 along the short sides 32 of the mask is not limiting. For example in the case where the mask is stretched in two directions parallel to its length and width, it is advantageous to arrange the vibration dampers according to the invention both along the horizontal and vertical edges of said mask.

Par ailleurs, les oscillateurs amortisseurs selon l'invention peuvent indifféremment être disposés sur la surface du masque faisant face à l'écran de phosphores ou inversement sur la surface du masque coté canon à électrons. Il peut être également avantageux de disposer les amortisseurs 55 sur les deux faces du masque afin d'obtenir l'effet d'amortissement désiré.Furthermore, the damping oscillators according to the invention can indifferently be placed on the surface of the mask facing the screen of phosphors or vice versa on the surface of the mask on the electron gun side. he can also be advantageous to have the shock absorbers 55 on both sides of the mask in order to obtain the desired damping effect.

Des moyens de positionnement de l'oscillateur couplé 55 sur la surface du masque peuvent être ajoutés sans modification complexe de la structure dudit oscillateur ou du masque lui-même. Ces moyens ont pour objectif de faciliter le positionnement de l'oscillateur couplé sur le bord du masque durant le processus de fabrication du tube. Comme illustré sur la figure 7 ces moyens de positionnement peuvent être constitué par une languette 65 solidaire de l'oscillateur 55 coopérant avec une encoche 66 située sur le bord du masque 8. De manière alternative la languette peut être solidaire du masque et l'encoche située sur la partie centrale 51 de l'oscillateur 55.Positioning means of the coupled oscillator 55 on the surface of the mask can be added without complex modification of the structure of said oscillator or the mask itself. These means are intended to facilitate the positioning of the coupled oscillator on the edge of the mask during tube manufacturing process. As illustrated in FIG. 7, these means of positioning can be constituted by a tongue 65 integral with the oscillator 55 cooperating with a notch 66 located on the edge of the mask 8. Alternatively the tongue can be secured to the mask and the notch located on the central part 51 of the oscillator 55.

Dans un autre mode de réalisation non illustré, les moyens de positionnement peuvent être constitués par un bossage destiné à s'insérer dans une ouverture adaptée; le bossage peut indifféremment être disposé sur le masque et il coopère alors avec une ouverture disposée sur la partie centrale 51 de l'oscillateur, ou bien le bossage est disposé sur la surface de l'oscillateur 55, par exemple sur sa partie centrale 51 et il coopère alors avec une ouverture disposée sur le bord du masque 8.In another embodiment not illustrated, the positioning means may consist of a boss intended to be inserted into an opening adapted; the boss can indifferently be placed on the mask and it then cooperates with an opening disposed on the central part 51 of the oscillator, or else the boss is disposed on the surface of the oscillator 55, for example on its central part 51 and it then cooperates with an opening arranged on the edge of the mask 8.

Suivant la disposition de l'amortisseur sur le bord du masque et l'amplitude des vibration de celui-ci, il peut arriver que la partie mobile 50 de l'amortisseur passe de l'autre coté du masque et viennent se bloquer sur le bord 62 de celui-ci. L'amortisseur ainsi immobilisé ne remplit plus alors sa fonction.According to the arrangement of the shock absorber on the edge of the mask and the amplitude of the vibration of it, it can happen that the moving part 50 of the shock absorber goes to the other side of the mask and comes to hang on the edge 62 thereof. The damper thus immobilized no longer fulfills its function.

La figure 9 illustre un mode de réalisation de l'invention évitant l'apparition de ce problème. Des moyens de guidage 68 sont disposés au niveau de la partie libre 50 de la bande métallique flexible constituant l'amortisseur de vibration 55, prés du bord 62 du masque 8 . Ces moyens ont ici la forme d'une languette, formant avec la surface du masque un angle non nul, de préférence de l'ordre de 90°, de manière à s'étendre du coté du masque sur lequel se trouve l'amortisseur de vibration 55. Cette languette 68 a une hauteur suffisante pour éviter que la partie libre 50 ne passe par dessus et ne vienne se bloquer sur le bord 62. Les languettes 68 peuvent former avec le masque une pièce unitaire en étant réalisée au moment de la découpe du masque et pliées par la suite, ou bien elles peuvent être des pièces additionnelles, solidarisées au masque ultérieurement, par exemple par soudure.FIG. 9 illustrates an embodiment of the invention avoiding the appearance of this problem. Guide means 68 are arranged at the level of the free part 50 of the flexible metal strip constituting the vibration damper 55, near the edge 62 of the mask 8. These means have here the shape of a tongue, forming a non-zero angle with the surface of the mask, preferably of the order of 90 °, so as to extend from the side of the mask on which is the vibration damper 55. This tongue 68 has a height sufficient to prevent the free part 50 from passing over and coming block on the edge 62. The tabs 68 can form with the mask a unitary piece being made when the mask is cut and folded thereafter, or they can be additional pieces, joined together mask later, for example by welding.

La figure 10 illustre un autre mode de réalisation de l'invention dans lequel les moyens de guidage 70 comporte une languette 70 solidarisée au cadre 19, par exemple par soudure en 71. Cette languette est également disposée au niveau de la partie libre 50 de l'amortisseur 55 et s'étend vers le bord 62 du masque avec une hauteur du coté du masque, où se trouve l'amortisseur 50, suffisante de manière à éviter que la partie libre 50 ne puisse passer de l'autre coté du masque lorsqu'elle vibre.FIG. 10 illustrates another embodiment of the invention in which the guide means 70 comprises a tongue 70 secured to the frame 19, for example by welding at 71. This tongue is also disposed at the free part 50 of the damper 55 and extends towards the edge 62 of the mask with a height on the side of the mask, where is the damper 50, sufficient so as to prevent the free part 50 from being able to go to the other side of the mask when it vibrates.

La figure 11 illustre un mode de réalisation de l'invention dans lequel les moyens de guidage ont la forme d'une languette 80 dont une extrémité est solidarisée au cadre en 81. L'autre extrémité 82 vient entourer, au moins partiellement la partie libre 50 de l'amortisseur 55, assurant ainsi un guidage amélioré, évitant en particulier que la partie libre 55 ne vienne frotter contre la zone effective ajourée 30 du masque.FIG. 11 illustrates an embodiment of the invention in which the guide means have the form of a tongue 80, one end of which is secured to the frame at 81. The other end 82 surrounds, at least partially the free part 50 of the shock absorber 55, thus ensuring guiding improved, in particular preventing the free part 55 from rubbing against the openwork effective area 30 of the mask.

L'invention présente l'avantage supplémentaire d'offrir des moyens de dissipation d'énergie additionnels permettant au masque de s'amortir plus rapidement. En effet, il est avantageux qu'une partie de l'aile 50 viennent au contact des moyens de guidage lorsque le masque et les amortisseurs 55 tendent à vibrer. L'énergie de vibration est alors dissipée par friction entre les parties en contact . Des collier métalliques 60 peuvent venir avantageusement compléter la dissipation d'énergie par friction.The invention has the additional advantage of offering means additional energy dissipation allowing the mask to absorb more quickly. Indeed, it is advantageous that part of the wing 50 come to the contact of the guide means when the mask and the shock absorbers 55 tend to vibrate. The vibration energy is then dissipated by friction between the parties in contact. Metal collars 60 can advantageously come complete the dissipation of energy by friction.

Par ailleurs, les oscillateurs amortisseurs 55 peuvent indifféremment être disposés sur la surface du masque faisant face à l'écran de phosphores ou inversement sur la surface du masque coté canon à électrons. Il peut être également avantageux de disposer les amortisseurs 55 sur les deux faces du masque afin d'obtenir l'effet d'amortissement désiré. L'invention et les moyens de guidage décrits s'adaptent à tous ces différents cas.Furthermore, the damping oscillators 55 can equally be arranged on the surface of the mask facing the phosphor screen or inversely on the surface of the mask on the electron gun side. He can be also advantageous to have the shock absorbers 55 on both sides of the mask in order to obtain the desired damping effect. The invention and the means guides described adapt to all these different cases.

Claims (16)

Tube à rayons cathodiques en couleurs (1) comprenant : un masque de sélection des couleurs (8) sous forme d'une feuille métallique sensiblement rectangulaire, adapté pour être fixé en tension sur un cadre support (19) et monté à l'intérieur de la face avant du tube, ledit masque comportant une zone centrale (30) percée d'orifices et une zone périphérique (28) disposée entre la zone centrale et les bords du masque, ledit masque étant susceptible de vibrer indépendamment du cadre support des moyens d'amortissement de vibrations du masque disposés à ladite périphérie du masque pour amortir les vibrations dans ledit masque,
les moyens d'amortissement étant caractérisés en ce qu'ils comportent un résonateur (55) sous forme de bande flexible dont une partie (51) est fixée sur une surface de la zone périphérique (28) du masque avec deux ailes (50) s'étendant de part et d'autre de cette partie centrale. Color cathode ray tube (1) comprising: a color selection mask (8) in the form of a substantially rectangular metal sheet, adapted to be tensioned on a support frame (19) and mounted inside the front face of the tube, said mask comprising a zone central (30) pierced with orifices and a peripheral zone (28) disposed between the central zone and the edges of the mask, said mask being capable of vibrating independently of the support frame means for damping vibrations of the mask arranged at said periphery of the mask to damp vibrations in said mask,
the damping means being characterized in that they comprise a resonator (55) in the form of a flexible strip, a part (51) of which is fixed to a surface of the peripheral zone (28) of the mask with two wings (50) s 'extending on either side of this central part. Tube à rayons cathodiques selon la revendication précédente caractérisé en ce que le masque est tendu suivant une seule direction et en ce que le résonateur est fixé sur un bord du masque, les ailes dudit résonateur s'étendant dans une direction parallèle à la direction de tension de celui-ci.Cathode ray tube according to the preceding claim characterized in that the mask is stretched in one direction and that the resonator is fixed on an edge of the mask, the wings of said resonator extending in a direction parallel to the tension direction thereof. Tube à rayons cathodique selon l'une des revendications précédentes caractérisé en ce que le résonateur comporte en outre des moyens (60, 61) pour dissiper l'énergie de vibration Cathode ray tube according to one of the preceding claims characterized in that the resonator further comprises means (60, 61) to dissipate vibration energy Tube à rayons cathodiques selon l'une des revendications précédentes caractérisé en ce que une partie (52) des ailes du résonateur viennent au contact de la surface du masque au moins lorsque celui-ci rentre en vibrationCathode ray tube according to one of the preceding claims characterized in that a part (52) of the wings of the resonator come to the contact of the mask surface at least when it comes into vibration Tube à rayons cathodiques selon la revendication précédente caractérisé en ce que la partie des ailes venant au contact de la surface du masque s'étend de part et d'autre du bord du masque de manière à le prendre en sandwich .Cathode ray tube according to the preceding claim characterized in that the part of the wings coming into contact with the surface of the mask extends from on either side of the edge of the mask so as to sandwich it. Tube à rayons cathodique selon l'une des revendications 3 à 5 caractérisé en ce que les moyens pour dissiper l'énergie comportent au moins un anneau (60) traversant l'épaisseur d'une aile du résonateur.Cathode ray tube according to one of claims 3 to 5 characterized in that the means for dissipating energy comprise at least one ring (60) crossing the thickness of a wing of the resonator. Tube à rayons cathodiques selon l'une des revendications précédentes caractérisé en ce qu'un résonateur et le masque comportent des moyens complémentaires de positionnement (65,66) coopérant pour assurer ledit positionnement du résonateur sur une surface du masque.Cathode ray tube according to one of the preceding claims characterized in that a resonator and the mask include means complementary positioning (65,66) cooperating to ensure said positioning of the resonator on a surface of the mask. Tube à rayons cathodiques selon la revendication précédente caractérisée en ce que les moyens de positionnement comportent un bossage coopérant avec une ouverture.Cathode ray tube according to the preceding claim characterized in that the positioning means comprise a cooperating boss with an opening. Tube à rayons cathodiques selon la revendication 7 en ce que les moyens de positionnement comportent une languette (65) coopérant avec une encoche (66).Cathode ray tube according to claim 7 in that the means for positioning have a tongue (65) cooperating with a notch (66). Tube à rayons cathodiques en couleurs (1) selon l'une quelconque des revendications précédentes caractérisé en ce qu'il comprend en outre des moyens de guidage (68, 70, 80) des mouvements de la partie libre (50) de la bande métallique flexible pour maintenir ladite partie libre du même coté du masque. Color cathode ray tube (1) according to any one of previous claims characterized in that it further comprises means for guiding (68, 70, 80) the movements of the free part (50) of the flexible metal band to keep said free part on the same side of the mask. Tube à rayons cathodiques selon la revendication précédente caractérisé en ce que les moyens de guidage (68) sont solidaires du masque.Cathode ray tube according to the preceding claim characterized in that the guide means (68) are integral with the mask. Tube à rayons cathodiques selon la revendication précédente caractérisé en ce que les moyens de guidage comprennent au moins une languette (68) s'étendant à partir de la surface du masque au niveau de la partie libre de la bande (55).Cathode ray tube according to the preceding claim characterized in that the guide means comprise at least one tongue (68) extending from the surface of the mask at the free part of the band (55). Tube selon la revendication précédente caractérisé en ce que la languette (68) est sensiblement perpendiculaire à la surface du masque.Tube according to the preceding claim, characterized in that the tongue (68) is substantially perpendicular to the surface of the mask. Tube à rayons cathodiques selon la revendication 10 caractérisé en ce que les moyens de guidage (70,80) sont solidaires du cadre.Cathode ray tube according to claim 10 characterized in that the guide means (70,80) are integral with the frame. Tube à rayons cathodiques selon la revendication précédente caractérisé en ce que les moyens de guidage comportent au moins une languette (70, 80) dont l'une des extrémité est solidaire du cadre, cette languette s'étendant du cadre vers le bord (52) du masque au niveau de la partie libre de la bande flexible (55)Cathode ray tube according to the preceding claim characterized in that the guide means comprise at least one tongue (70, 80) one end of which is integral with the frame, this tongue extending from frame towards the edge (52) of the mask at the free part of the strip flexible (55) Tube à rayons cathodiques selon la revendication précédente caractérisé en ce que l'extrémité libre (82) de la languette (80) vient entourer, au moins partiellement, la partie libre de la bande flexible (55).Cathode ray tube according to the preceding claim characterized in that the free end (82) of the tongue (80) surrounds, at least partially, the free part of the flexible strip (55).
EP20000403034 1999-11-05 2000-10-31 Shadow mask-frame assembly for cathode ray tube Expired - Lifetime EP1098349B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT1999MI002324A IT1313924B1 (en) 1999-11-05 1999-11-05 STRUCTURE OF FRAME / MASK PERFECTED FOR TUBE WITH CATHODE RAYS.
ITMI992324 1999-11-05
IT2000MI001480A IT1318092B1 (en) 2000-06-30 2000-06-30 Cathode ray tube colour mask vibration deadening structure having outer peripheral zone mounted central section band having outer extended protruding sections.
ITMI201480 2000-06-30

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WO2002039477A2 (en) * 2000-11-07 2002-05-16 Thomson Licensing S.A. Crt having a tension mask with vibration damping mean
WO2002039477A3 (en) * 2000-11-07 2003-09-12 Thomson Licensing Sa Crt having a tension mask with vibration damping mean
EP1231624A2 (en) * 2001-02-01 2002-08-14 Thomson Licensing S.A. CRT having a vibration damper for a tension mask
EP1231624A3 (en) * 2001-02-01 2002-10-23 Thomson Licensing S.A. CRT having a vibration damper for a tension mask
WO2003023811A1 (en) * 2001-09-07 2003-03-20 Thomson Licensing S.A. Crt having vibration damping system
US7091655B2 (en) 2001-09-07 2006-08-15 Thomson Licensing CRT vibration damping system
WO2003049136A2 (en) * 2001-11-29 2003-06-12 Thomson Licensing S. A. Cathode ray tube having a tension mask with microphonics control
WO2003049136A3 (en) * 2001-11-29 2003-11-20 Thomson Licensing Sa Cathode ray tube having a tension mask with microphonics control
WO2003058670A2 (en) * 2001-12-21 2003-07-17 Thomson Licensing S. A. A crt having a shadow mask vibration damper
US6710531B2 (en) 2001-12-21 2004-03-23 Thomson Licensing S.A. CRT having a shadow mask vibration damper
WO2003058670A3 (en) * 2001-12-21 2003-12-04 Thomson Licensing Sa A crt having a shadow mask vibration damper
DE10297556B4 (en) * 2001-12-21 2007-08-09 Thomson Licensing S.A. Cathode ray tube with a shadow mask vibration damper
WO2004086450A1 (en) * 2003-03-19 2004-10-07 Thomson Licensing S.A. Masking device for a cathode ray tube

Also Published As

Publication number Publication date
EP1098349B1 (en) 2005-04-27
DE60019702D1 (en) 2005-06-02
DE60019702T2 (en) 2006-04-27

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