EP1098349B1 - 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
EP1098349B1
EP1098349B1 EP20000403034 EP00403034A EP1098349B1 EP 1098349 B1 EP1098349 B1 EP 1098349B1 EP 20000403034 EP20000403034 EP 20000403034 EP 00403034 A EP00403034 A EP 00403034A EP 1098349 B1 EP1098349 B1 EP 1098349B1
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EP
European Patent Office
Prior art keywords
mask
cathode ray
ray tube
tube according
previous
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.)
Expired - Lifetime
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EP20000403034
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German (de)
French (fr)
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EP1098349A1 (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
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Publication of EP1098349B1 publication Critical patent/EP1098349B1/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06Screens for shielding; Masks interposed in the electron stream
    • H01J29/07Shadow masks for colour television tubes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00Details of cathode ray tubes or electron beam tubes
    • H01J2229/07Shadow masks
    • H01J2229/0727Aperture plate
    • H01J2229/0738Mitigating undesirable mechanical effects
    • H01J2229/0744Vibrations

Definitions

  • the present invention relates to a mask structure of selection of colors for cathode ray tube in colors.
  • the invention finds its application in any type of tube with a mask of selection of colors and is particularly suitable for tubes whose mask is maintained in tension by the frame on which it is secured.
  • Conventional cathode ray tubes comprise a mask of selection of colors located at a precise distance from the inside of the face front glass tube, front face on which are deposited networks of red, green and blue phosphors to form a screen.
  • a gun to electrons arranged inside the tube, in its rear part, generates three electron beams in the direction of the front face.
  • Deflection devices electromagnetic, usually arranged outside the tube and close to the The function of the electron gun is to deflect electron beams in order to have them scan the surface of the panel on which the networks are of phosphors. Under the influence of three electron beams corresponding each to a particular 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.
  • the color selection mask must be arranged and maintained during the operation of the tube in a precise position inside the tube.
  • the functions of maintaining the mask are realized thanks to a metal frame rectangular usually very rigid on which the mask is conventionally welded.
  • the frame / mask assembly is mounted in the face before the tube thanks to suspension means most often welded on the frame and cooperating with pins inserted in the glass constituting the face before the tube.
  • the tubes whose front face is becoming flatter correspond to the current trend, with a move towards completely flat front faces.
  • the color selection mask consisting of a metal sheet very small thickness, its setting in tension can generate phenomena parasite vibration of said mask during operation of the tube. Under the influence of shock or external mechanical vibrations, for example acoustic vibrations due to the speakers of the television set in which the tube is inserted, the mask can vibrate according to its own frequency of resonance.
  • the vibrations of the mask have the effect of modifying the landing zone of the electron beams on the tube screen, the dots the impact of each beam being then offset with respect to the associated phosphor, thus creating a discoloration of the image reproduced on the screen.
  • Masks having an effective planar surface particularly in the case where the mask is held in tension by the frame, present a great sensitivity to the vibrations of their environment requiring the use of damping means to prevent the mask from coming into vibration.
  • US4827179 proposes to add on one side of the mask means damping the vibration of the mask.
  • the devices of depreciation implemented in this patent have a complicated structure, difficult to implement.
  • 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, in the form of a funnel 4, thanks to a sintered glass sealing.
  • the end portion of the tube 5 surrounds the barrel at electrons 6 whose beams come to illuminate 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 metal frames of the frame / mask assembly maintain this set the inside of the tube, said supports possibly comprising a portion 10 welded to the frame and a spring portion 11, provided with an opening for cooperating with a peg 12 included in the glass skirt 3.
  • the frame 19 comprises a pair of long sides 9 and a pair of short sides 7, said long and short sides having for example an L section.
  • the mask 8 itself of substantially rectangular shape, is put in tension and then maintained 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 steel or Invar, very thin, of the order of 100 .mu.m.
  • the mask has a central zone 30 pierced with openings generally arranged in columns and a peripheral area 28 surrounding the central area with edges horizontal 31 and vertical 32.
  • Cathode ray tube structures using selection masks colors put in tension have to deal with the problem of vibration of this mask, following modes that are specific to it, when said mask is excited by external vibrations, for example mechanical shocks on the tube or sound vibrations coming from speakers arranged nearby of the tube.
  • vibrations are 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 guarantee, the landing point of the beams on the screen being shifted in depending on the amplitude of the vibration.
  • the vibrations of the mask are amortized only very slowly, the energy communicated to the mask having little means of dissipation, which increases the visibility of the phenomenon on the screen when the tube is in operation.
  • the invention proposes a simple, economical structure, and easy to implement. to dampen the vibrations of a mask stretched in one or two directions.
  • FIG. 5 is a perspective view of a first embodiment of FIG. the invention, adapted to a mask stretched in a single direction, for example parallel to its short sides 32.
  • a damping device 55 in the form of band, for example metal, comprising a central portion 51 secured to on the surface of the edge of the mask, for example by welding, and two wings 50 extending from both sides of this central part.
  • the device cushioning 55 can thus be produced in one piece by cutting a metal strip and stamping or two identical pieces connected between them at 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 as the length of the wings 50, their thickness and their weight are chosen in a conventional way so that the the natural frequency of vibration of the device 55 is close to a chosen value, for example the natural resonant frequency of the mask so that the vibrations of the damping device 55 come to evade the mask vibrations.
  • the frame / mask device When the frame / mask device is such that the mask has a part openwork 30 with openings in columns interconnected by bridges that the tension exerted on the mask is axial, following example the direction of the short sides 32, the long sides being welded on the edges 20 of the long sides 9 of the frame, the behavior of the mask in vibration is in accordance with Figure 4; the vibration amplitude of the mask is maximum at middle level of short sides 32.
  • a damper according to the invention in the middle of each of the two short sides of the mask.
  • the invention provides a structure for simply implementing means of dissipating the energy imparted to the mask during shock of tube or through powerful sound waves. Indeed, we must avoid that the vibrations communicated to the mask, even if they are low amplitude, do not last too long because they then 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 dissipation means energy for the mask to amortize 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 damper wing and the mask surface, as shown by Figure 6 illustrating a side view of the frame / mask according to the invention.
  • the wing shape of the device 55 provides the maximum dissipation of friction energy 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 damper 55 being disposed in the zone of maximum vibration amplitude 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 with respect to the plane of the mask.
  • FIG. 8 shows, in a perspective view, the detail of the end of the wing 50 according to another embodiment; this end 52 comes sandwicher 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 faster the vibration energy of the mask.
  • 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 lower to the diameter of the orifice 61 so as to be able to move in this orifice and dissipate the energy by friction on the edge of said hole.
  • rivets are arranged so as to cross the wings 50 through orifices 61 made thereon, the heads of the rivets having a dimension greater than that of the orifices then that the rivet body has a section smaller than the diameter of said orifice.
  • the arrangement of the coupled oscillators 55 along the short sides 32 of the mask is not limiting.
  • 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 arranged on the surface of the mask facing the screen of phosphors or conversely on the surface of the mask on the electron gun side. he can also be advantageous to have the dampers 55 on both faces of the mask to obtain the desired damping effect.
  • Means for positioning the coupled oscillator 55 on the surface of the mask can be added without complex modification of the structure of the oscillator or mask itself. These means are intended to facilitate the positioning of the coupled oscillator on the edge of the mask during the process of manufacturing the tube. As illustrated in FIG. 7, these means of positioning can be constituted by a tab 65 integral with the oscillator 55 cooperating with a notch 66 located on the edge of the mask 8. Alternatively, the tongue may be integral with the mask and the notch located on the central portion 51 of the oscillator 55.
  • the positioning means may be constituted by a boss intended to fit into an opening adapted; the boss can indifferently be arranged on the mask and it then cooperates with an opening disposed on the central portion 51 of the oscillator, or 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.
  • FIG. 9 illustrates an embodiment of the invention avoiding the appearance of this problem.
  • Guiding means 68 are arranged at level of the free portion 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 with the surface of the mask a non-zero angle, preferably of the order of 90 °, so as to extend to 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 going over and coming block on the edge 62.
  • the tabs 68 can form with the mask a unitary piece being made at the time of cutting the mask and folded thereafter, or they may be additional pieces, solidarisés to the 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 in 71.
  • This tongue is also disposed at the free portion 50 of the damper 55 and extends towards the edge 62 of the mask with a height of the side of the mask, where is damper 50, sufficient to prevent the free portion 50 can not to pass on the other side of the mask when it vibrates.
  • FIG. 11 illustrates an embodiment of the invention in which the guide means are in the form of a tongue 80, one end of which is secured to the frame 81.
  • the other end 82 surrounds, at least partially the free portion 50 of the damper 55, thereby providing guiding improved, avoiding in particular that the free part 55 does not come to rub against the open area 30 of the mask.
  • the invention has the additional advantage of offering means additional energy dissipation allowing the mask to amortize more quickly. Indeed, it is advantageous that part of the wing 50 come to contact guiding means when the mask and the dampers 55 tend to vibrate. The vibration energy is then dissipated by friction between parties in contact. Metal collars 60 can come advantageously complete the energy dissipation by friction.
  • the damping oscillators 55 can indifferently 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 dampers 55 on both sides of the mask to obtain the desired damping effect.

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 of selection of colors for cathode ray tube in colors. The invention finds its application in any type of tube with a mask of selection of colors and is particularly suitable for tubes whose mask is maintained 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 comprise a mask of selection of colors located at a precise distance from the inside of the face front glass tube, front face on which are deposited networks of red, green and blue phosphors to form a screen. A gun to electrons arranged inside the tube, in its rear part, generates three electron beams in the direction of the front face. Deflection devices electromagnetic, usually arranged outside the tube and close to the The function of the electron gun is to deflect electron beams in order to have them scan the surface of the panel on which the networks are of phosphors. Under the influence of three electron beams corresponding each to a particular 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 arranged and maintained during the operation of the tube in a precise position inside the tube. The functions of maintaining the mask are realized thanks to a metal frame rectangular usually very rigid on which the mask is conventionally welded. The frame / mask assembly is mounted in the face before the tube thanks to suspension means most often welded on the frame and cooperating with pins inserted in the glass constituting the face before 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 becoming flatter correspond to the current trend, with a move towards completely flat front faces.

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 produce tubes comprising 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 small thickness, its setting in tension can generate phenomena parasite vibration of said mask during operation of the tube. Under the influence of shock or external mechanical vibrations, for example acoustic vibrations due to the speakers of the television set in which the tube is inserted, the mask can vibrate according to its own frequency of resonance. The vibrations of the mask have the effect of modifying the landing zone of the electron beams on the tube screen, the dots the impact of each beam being then offset with respect to the associated phosphor, 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.Masks having an effective planar surface, particularly in the case where the mask is held in tension by the frame, present a great sensitivity to the vibrations of their environment requiring the use of damping means to prevent the mask from coming into 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.US4827179 proposes to add on one side of the mask means damping the vibration of the mask. However the devices of depreciation implemented 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 the present 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 having a central zone pierced with orifices and a peripheral zone disposed between the central zone and the edges of the mask, said mask being capable of vibrating independently of the support frame
  • vibration damping means of the mask disposed at said periphery of the mask for damping vibrations in said mask,
the damping means being characterized in that they comprise a resonator in the form of a flexible metal band, part of which is fixed on 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 with the aid of the description below and the drawings among which:
  • FIG. 1 represents a cathode ray tube according to the invention partially exploded
  • FIG. 2 depicts a stretched frame / mask assembly 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 state of the art.
  • FIG. 4 illustrates the profile of displacement of the surface of a stretched mask subjected to vibrations
  • Figures 5 to 8 illustrate various embodiments of the invention.
  • FIGS. 9 to 11 illustrate embodiments that further incorporate means for guiding the displacements 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, in the form of a funnel 4, thanks to a sintered glass sealing. The end portion of the tube 5 surrounds the barrel at electrons 6 whose beams come to illuminate 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 metal frames of the frame / mask assembly maintain this set the inside of the tube, said supports possibly comprising a portion 10 welded to the frame and a spring portion 11, provided with an opening for cooperating with a peg 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, comprises a pair of long sides 9 and a pair of short sides 7, said long and short sides having for example an L section. The mask 8, itself of substantially rectangular shape, is put in tension and then maintained 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 steel or Invar, very thin, of the order of 100 .mu.m. The mask has a central zone 30 pierced with openings generally arranged in columns and a peripheral area 28 surrounding the central area 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 put in tension have to deal with the problem of vibration of this mask, following modes that are specific to it, when said mask is excited by external vibrations, for example mechanical shocks on the tube or sound vibrations coming from speakers arranged nearby of the tube. These vibrations are 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 guarantee, the landing point of the beams on the screen being shifted in depending on 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.Moreover, since the mask is disposed inside the tube in which reigns a high vacuum, the vibrations of the mask are amortized only very slowly, the energy communicated to the mask having little 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, US Pat. No. 4,827,179 proposes a solution for damping the vibrations of the mask by a device 41 forming a coupled oscillator, by placing on the edges of the mask 8, close to the zone where the mask is welded to the frame 40 , a mechanical structure comprising a rigid support 42 to which is welded at least one flexible blade 43. The resonance natural frequency of the device 41 is chosen so as to damp the vibrations of the mask in a determined frequency band. However, this structure has a certain number of disadvantages:
  • it is complex and expensive because of the large number of metal parts used (support and flexible blades)
  • in the damping structure, energy-dissipating elements must be added if the vibrations of the mask are to be amortized rapidly.

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 proposes a simple, economical structure, and easy to implement. 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 FIG. the invention, adapted to a mask stretched in a single 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 portion 28 of the mask 8, for example along its sides 32, is disposed a damping device 55 in the form of band, for example metal, comprising a central portion 51 secured to on the surface of the edge of the mask, for example by welding, and two wings 50 extending from both sides of this central part. The device cushioning 55 can thus be produced in one piece by cutting a metal strip and stamping or two identical pieces connected between them at 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 as the length of the wings 50, their thickness and their weight are chosen in a conventional way so that the the natural frequency of vibration of the device 55 is close to a chosen value, for example the natural resonant frequency of the mask so that the vibrations of the damping device 55 come to evade 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 openings in columns interconnected by bridges that the tension exerted on the mask is axial, following example the direction of the short sides 32, the long sides being welded on the edges 20 of the long sides 9 of the frame, the behavior of the mask in vibration is in accordance with Figure 4; the vibration amplitude of the mask is maximum at middle level of short sides 32. For a tube incorporating a frame mask of the type described above, it is therefore advantageous to have a damper 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 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 for simply implementing means of dissipating the energy imparted to the mask during shock of tube or through powerful sound waves. Indeed, we must avoid that the vibrations communicated to the mask, even if they are low amplitude, do not last too long because they then 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 dissipation means energy for the mask to amortize 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 damper wing and the mask surface, as shown by Figure 6 illustrating a side view of the frame / mask according to the invention. The wing shape of the device 55 provides the maximum dissipation of friction energy 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 damper 55 being disposed in the zone of maximum vibration amplitude 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 with respect 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.FIG. 8 shows, in a perspective view, the detail of the end of the wing 50 according to another embodiment; this end 52 comes sandwicher 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 faster 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 reduce 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 lower to the diameter of the orifice 61 so as to be able to move in this orifice and dissipate the energy by friction on the edge of said hole.

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.In another embodiment not shown, rivets are arranged so as to cross the wings 50 through orifices 61 made thereon, the heads of the rivets having a dimension greater than that of the orifices then that the rivet body has a section smaller than the diameter of said 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.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 following 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.Moreover, the damping oscillators according to the invention can indifferently be arranged on the surface of the mask facing the screen of phosphors or conversely on the surface of the mask on the electron gun side. he can also be advantageous to have the dampers 55 on both faces of the mask 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.Means for positioning the coupled oscillator 55 on the surface of the mask can be added without complex modification of the structure of the oscillator or mask itself. These means are intended to facilitate the positioning of the coupled oscillator on the edge of the mask during the process of manufacturing the tube. As illustrated in FIG. 7, these means of positioning can be constituted by a tab 65 integral with the oscillator 55 cooperating with a notch 66 located on the edge of the mask 8. Alternatively, the tongue may be integral with the mask and the notch located on the central portion 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 be constituted by a boss intended to fit into an opening adapted; the boss can indifferently be arranged on the mask and it then cooperates with an opening disposed on the central portion 51 of the oscillator, or 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 vibrations of it, it can happen that the mobile part 50 of the damper passes on the other side of the mask and come hang on the edge 62 of it. The damper immobilized thus 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. Guiding means 68 are arranged at level of the free portion 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 with the surface of the mask a non-zero angle, preferably of the order of 90 °, so as to extend to 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 going over and coming block on the edge 62. The tabs 68 can form with the mask a unitary piece being made at the time of cutting the mask and folded thereafter, or they may be additional pieces, solidarisés to the 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 in 71. This tongue is also disposed at the free portion 50 of the damper 55 and extends towards the edge 62 of the mask with a height of the side of the mask, where is damper 50, sufficient to prevent the free portion 50 can not to pass on 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 are in the form of a tongue 80, one end of which is secured to the frame 81. The other end 82 surrounds, at least partially the free portion 50 of the damper 55, thereby providing guiding improved, avoiding in particular that the free part 55 does not come to rub against the open 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 amortize more quickly. Indeed, it is advantageous that part of the wing 50 come to contact guiding means when the mask and the dampers 55 tend to vibrate. The vibration energy is then dissipated by friction between parties in contact. Metal collars 60 can come advantageously complete the energy dissipation 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.Moreover, the damping oscillators 55 can indifferently 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 dampers 55 on both sides of the mask to obtain the desired damping effect.

Claims (16)

  1. Color cathode ray tube (1) comprising:
    a color selection mask (8) in the form of a recognisably rectangular metal sheet, adapted to be fixed in tension on a frame assembly (19) and mounted in the front face of the tube, said mask comprising a central zone (30) pierced with openings and a peripheral zone (28) arranged between the central zone and the edges (62) of the mask, the said mask being able to vibrate independently from the frame assembly.
    mask vibration damping means disposed on said mask periphery to damp the vibrations in said mask,
       the damping means being characterized in that they have a resonator (55) in the form of a flexible strip with a central part that is affixed to a surface of the peripheral zone (28) of the mask with two wings extending on either side of this central part.
  2. Cathode ray tube according to the previous daim, characterized in that the mask is tensioned according to a single direction and in that the resonator is fixed to the peripheral zone of the mask, the wings of said resonator extending parallel to the direction of tension of the resonator.
  3. Cathode ray tube according to one of the previous claims, characterized in that the resonator additionally comprises means (60, 61) for dissipating the vibrational energy.
  4. Cathode ray tube according to one of the previous daims, characterized in that a part (52) of the wings of the resonator come into contact with the surface of the mask at least when this mask vibrates.
  5. Cathode ray tube according to the previous claim, characterized in that the part of the wings coming into contact with the surface of the mask extends on either side of the peripheral zone of the mask in such a manner as to sandwich the mask.
  6. Cathode ray tube according to one of daims 3 to 5 characterized in that the means for dissipating the energy comprises at least one ring (60) passing through the thickness of a wing of the resonator.
  7. Cathode ray tube according to one of the previous claims, characterized in that a resonator and the mask comprise additional positioning means (65, 66) co-operating to ensure the said positioning of the resonator on a surface of the mask.
  8. Cathode ray tube according to the previous daim, characterized in that the positioning means comprise a projection co-operating with an aperture.
  9. Cathode ray tube according to daim 7 characterized in that the positioning means comprises a tab (65) co-operating with a notch (66).
  10. Color cathode ray tube (1) according to any one of the previous daims, characterized in that it additionally comprises a means (68, 70, 80) for guiding the movements of the free part (50) of the flexible metal strip to maintain said free part of the same side of the mask.
  11. Cathode ray tube according to the previous daim, characterized in that the guidance means (68) is integral with the mask.
  12. Cathode ray tube according to the previous daim, characterized in that the guidance means comprises at least one tab (68) extending from the surface of the mask at the level of the free part of the strip (55).
  13. Cathode ray tube according to the previous claim, characterized in that the tab (68) is noticeably perpendicular to the surface of the mask
  14. Cathode ray tube according to daim 10 characterized in that the guidance means (70, 80) are integral with the frame.
  15. Cathode ray tube according to the previous claim. characterized in that the guidance means comprises at least one tab (70, 80), of which one end is integral with the frame, this tab extending from the frame to the edge (62) of the mask at the level of the free part of the flexible strip (55).
  16. Cathode ray tube according to the previous daim, characterized in that the free end (82) of the tab (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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EP1098349A1 EP1098349A1 (en) 2001-05-09
EP1098349B1 true EP1098349B1 (en) 2005-04-27

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW503427B (en) * 2000-07-25 2002-09-21 Koninkl Philips Electronics Nv Display tube comprising a mask with vibration damping means
IT1319319B1 (en) * 2000-11-07 2003-10-10 Videocolor Spa COLOR CATHODE TUBE AND MORE IN PARTICULAR A MASK STRUCTURE ADAPTED TO BE MAINTAINED IN VOLTAGE INSIDE THE
US6520475B2 (en) * 2001-02-01 2003-02-18 Thomson Licensing S. A. Split foot damper
ITMI20011874A1 (en) * 2001-09-07 2003-03-07 Videocolor Spa SHOCK ABSORBER SYSTEM FOR MASK / FRAME TENSION COMPLEX
US6700319B2 (en) * 2001-11-29 2004-03-02 Thomson Licensing S. A. Cathode-ray tube having a tension mask with microphonics control
US6710531B2 (en) * 2001-12-21 2004-03-23 Thomson Licensing S.A. CRT having a shadow mask vibration damper
ITMI20030527A1 (en) * 2003-03-19 2004-09-20 Videocolor Spa MASKING DEVICE FOR TUBE WITH CATHODE RAYS

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Publication number Priority date Publication date Assignee Title
US4318025A (en) * 1979-11-21 1982-03-02 North American Philips Consumer Electronics Corp. Shadow mask microphonic suppressor
US4827179A (en) * 1987-06-09 1989-05-02 Zenith Electronics Corporation Mask vibration damping in cathode ray tubes
US5391957A (en) * 1992-12-28 1995-02-21 Zenith Electronics Corporation Vibration damping means for a strip shadow mask
US5394051A (en) * 1992-12-28 1995-02-28 Zenith Electronics Corporation Vibration-damping configuration in a strip shadow mask
JP3189765B2 (en) * 1997-10-20 2001-07-16 ソニー株式会社 Color cathode ray tube and aperture grill

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DE60019702T2 (en) 2006-04-27
DE60019702D1 (en) 2005-06-02

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