EP1586105A2 - Colour cathode ray tube with essentially flat screen - Google Patents

Colour cathode ray tube with essentially flat screen

Info

Publication number
EP1586105A2
EP1586105A2 EP03812080A EP03812080A EP1586105A2 EP 1586105 A2 EP1586105 A2 EP 1586105A2 EP 03812080 A EP03812080 A EP 03812080A EP 03812080 A EP03812080 A EP 03812080A EP 1586105 A2 EP1586105 A2 EP 1586105A2
Authority
EP
European Patent Office
Prior art keywords
mask
frame
cathode ray
skirt
ray tube
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.)
Withdrawn
Application number
EP03812080A
Other languages
German (de)
French (fr)
Inventor
Carlo Tulli
Pedro Eugenio Cosma
Paolo Ginesti
Alessio Masi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
THOMSON LICENSING
Original Assignee
Thomson Licensing SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Publication of EP1586105A2 publication Critical patent/EP1586105A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H01J29/073—Mounting arrangements associated with shadow masks
    • 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
    • H01J2229/0716—Mounting arrangements of aperture plate to frame or vessel

Definitions

  • the present invention relates to a color cathode ray tube having a substantially planar screen, and more precisely a frame / mask assembly for selecting colors fitted to such a tube.
  • the invention finds its application in any type of tube comprising a mask for selecting colors, and is more particularly suitable for tubes whose mask is produced by stamping and is held in place inside the tube by a rigid frame on which he is united.
  • a conventional color cathode ray tube is composed of a vacuum glass envelope.
  • the tube has inside the envelope, a mask for selecting colors located at a precise distance from the front face , made of glass from the tube, front face on which are deposited arrays of red, green and blue phosphors to form a screen.
  • An electron gun placed inside the tube, in its rear part, generates three? electronic harnesses towards the front face.
  • An electromagnetic deflection device generally placed outside the tube and close to the electron gun, has the function of deflecting the electron beams in order to make them scan the surface of the panel on which the phosphor networks are arranged. Under the influence of three electron beams each corresponding to a specific primary color, the phosphor networks allow the reproduction of color images on the screen, the mask allowing each determined beam to illuminate only the luminophore of the color. corresponding.
  • 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 performed by means of a generally very rigid rectangular metal frame on which the mask is conventionally welded.
  • the frame / mask assembly is mounted in the front face of the tube by means of suspension means welded to the frame and cooperating with pins inserted in the glass constituting the front face of the tube.
  • the color selection mask is produced from a very thin metal sheet and comprises a surface known as an effective surface, pierced with openings, said openings being produced by chemical etching and generally arranged in vertical columns; the effective surface is surrounded by a non-perforated peripheral border; a skirt generally produced by stamping, borders the assembly, extending in a direction substantially perpendicular to the effective surface.
  • the mask is secured to the frame by spot welding at the skirt.
  • the tubes whose front face is more and more flat correspond to the current trend, until evolving towards completely flat front faces with internal and external surfaces defined by very large radius of curvature. In general, the surface of the mask must follow the shape of the internal part of the front face of the tube, so that their curvature is substantially identical.
  • the color selection mask of a conventional tube has a surface defined by horizontal and vertical profiles with small radii of curvature, of the order of one or two meters in the central area; this curved surface can be represented by a complex polynomial expression and the low value of the radii of curvature ensures the mechanical rigidity of the mask surface.
  • the radii of curvature defining the mask surface are also large values.
  • the surface of the mask facing the screen of the tube is found to be substantially flat and this results in low mechanical rigidity which makes said mask very sensitive to external vibrations, induced for example by the loudspeakers of the television set equipped said tube; the mask then begins to vibrate, causing changes in its distance to the screen, which causes discoloration of the image formed on said screen.
  • Various devices have been developed to avoid vibrations of the mask by trying to stiffen the surface of the mask without giving complete satisfaction.
  • US Pat. No. 6,111,348 proposes a solution consisting in stiffening the surface of the mask by creating vertical streaks on said surface.
  • Patent US4645968 discloses a mask frame structure for color cathode ray tube in which the mask skirt is welded to the support frame, which frame has raised parts coming between the welds in contact with the mask skirt. This structure partially dampens the vibrations of the mask, but this improvement is insufficient for large tubes, having a very flat mask surface.
  • the color cathode ray tube according to the invention comprises:
  • a color selection mask placed facing the luminescent screen, said mask comprising a perforated surface substantially perpendicular to the longitudinal axis Z and a peripheral skirt folded in a direction substantially parallel to the longitudinal axis Z, - a frame substantially rectangular, comprising a pair of long dimensions and a pair of short sides, each dimension of the frame having a flange substantially parallel to the longitudinal axis Z, the peripheral skirt of the mask being welded at several points to said flange, characterized in that the frame comprises lugs arranged on the flange on the side in contact with the mask skirt, said lug covering at least partially the free end of said skirt.
  • FIG. 1 illustrates a section of a cathode ray tube with color selection mask along the longitudinal axis -
  • FIG. 2 shows a frame / mask assembly according to the invention in a partial top view
  • FIG. 3 is a cross-sectional view of the embodiment of Figure 2 at the axis A'A
  • FIG. 4 illustrates by a cross-sectional view of another embodiment at the axis A'A
  • FIG. 1 shows a cathode ray tube 1 composed of a vacuum envelope 2 comprising a substantially rectangular front face 3 and a funnel-shaped rear part 4 ending in a cylindrical neck 5.
  • the front face is defined from a horizontal axis X, parallel to its largest dimension, and a vertical axis Y, parallel to its smallest dimension; the axes
  • X and Y intersect at the center of the front face and are perpendicular to the main longitudinal axis Z which passes through the center of the cylindrical neck 5 and through the center of the front face 3.
  • a screen 6 of luminescent materials On the internal part of the front face 3 is deposited a screen 6 of luminescent materials, the latter being excited by the scanning of the electron beams 7 coming from an electron gun 8 placed in the neck of the tube.
  • the scanning of the electron beams is carried out by a magnetic deflection device 12 disposed on the neck of the tube.
  • a color selection mask 9 comprising a perforated surface 10, substantially parallel to the surface of the screen 6, and a skirt 11, folded in a direction substantially parallel to the longitudinal axis Z.
  • a frame 20, of L-shaped section, is mounted inside the glass envelope so as to position the mask at a precise distance from the luminescent screen.
  • the frame has a flange 21 which extends practically in a direction parallel to the axis Z.
  • the skirt 11 of the mask is placed inside the frame and spot welded to the flange 21.
  • the frame / mask assembly is held in place in the glass envelope by means of pins 13 included in the glass envelope cooperating with springs secured to the frame.
  • Figures 2 and 3 illustrate an embodiment of the invention showing a partial top view and a cross-sectional view of the frame / mask assembly.
  • the mask has a perforated active surface 10 surrounded by a skirt 11 folded in a direction substantially parallel to the axis Z.
  • the skirt ends in a free edge 15.
  • the skirt is inserted inside the frame 20 and welded to the flange 21 at several points 16, generally arranged at the corners of the mask and in the middle of the parallel sides of said rectangular mask.
  • Lugs 30 are secured to the flange of the frame at various points thereof; these lugs are produced for example from metal plates welded at one of their ends 31 to the flange 21 and folded so as to provide a space 32 between the frame and a surface 33 of the lug facing the flange 21, space intended to be partially occupied by the skirt 11 of the mask.
  • the free edge 15 of the mask is partially covered by the lug 30; at the place where said lug is arranged, the mask skirt is constrained in the free space 32, which limits the movements of the free part of the skirt.
  • the space 32 between the flange of the frame is preferably chosen at a value D of approximately 1 mm .
  • the space D is preferably chosen between 3 and 8 times the thickness of the mask.
  • the mechanical stresses exerted by the pins will cause the increase in the resonance frequency of the mask and bring it to a value greater than 100hz making its effects practically invisible to the eye of the observer. It was also observed that the effects of the lugs were maximized when the overlap width L of the skirt by the lug, in the direction of the axis Z was at least 50% of the length of the skirt following this same direction .
  • the pins 30 can be arranged on a pair of parallel sides of the frame or on the four sides of said frame. In the case where a plurality of lugs is arranged on parallel sides of the frame, it has been discovered that lugs should preferably be placed between the welding points of the frame to the mask.
  • the plurality of lugs arranged on one side of the frame can advantageously be replaced by a single lug covering more than half the length of the free end 15 of the mask, extending along the side of said frame.
  • a single lug according to the invention lug covering 90% of the length of the free end of the mask in the direction parallel to the side of the frame, the frequency of resonance of the mask frame assembly is brought to a value greater than 150 Hz, making the movements of the mask invisible to the eye of the observer.
  • This embodiment of the invention allows faster production of the frame and offers results substantially equivalent to the use of a plurality of lugs per side of the frame.
  • the pins 30 can be, as illustrated in the embodiments of Figures 2 and 3, constituted by inserts and welded to the sides of the frame.
  • the pins can also be made from the material constituting the flange itself.
  • FIG. 4 another embodiment of the invention is illustrated in FIG. 4 in the form of a lug 40.
  • the lug 40 is produced from the material constituting the flange 21; for example, when the lug has a substantially rectangular shape, three sides of the lug are formed by cutting the material of the frame, one side 41 remaining integral with the latter. The cut material is then pushed towards the inside of the frame so as to form a metal face 43 substantially parallel to the flange 21 and located at a distance D from the latter, so as to provide a space 32 between the lug and the flange of the frame.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

The invention relates to a cathode ray tube comprising a frame/mask unit for selection of colours (9, 20), in which the free end of the skirt on the mask (15) is held by brackets (30) fixed to the frame (20), such as to minimise the spurious movements of the mask skirt caused by the general vibrations of the tube environment.

Description

TUBE A RAYONS CATHODIQUES EN COULEURS AVEC ECRAN COLORED CATHODE RAY TUBE WITH SCREEN
SENSIBLEMENT PLANSUBSTANTIALLY PLAN
La présente invention concerne un tube à rayons cathodiques en couleurs ayant un écran sensiblement plan, et plus précisément un ensemble cadre /masque de sélection des couleurs équipant un tel tube. 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 réalisé par emboutissage et est maintenu en place à l'intérieur du tube par un cadre rigide sur lequel il est solidarisé.The present invention relates to a color cathode ray tube having a substantially planar screen, and more precisely a frame / mask assembly for selecting colors fitted to such a tube. The invention finds its application in any type of tube comprising a mask for selecting colors, and is more particularly suitable for tubes whose mask is produced by stamping and is held in place inside the tube by a rigid frame on which he is united.
Un tube à rayons cathodiques en couleurs conventionnel est composé d'une enveloppe en verre sous vide. Le tube comporte à l'intérieur de l'enveloppe, un masque de sélection des couleurs situé à une distance précise 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 dispositif 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 en couleurs sur l'écran, le masque permettant à chaque faisceau déterminé de n'illuminer que le luminophore de la couleur correspondante.A conventional color cathode ray tube is composed of a vacuum glass envelope. The tube has inside the envelope, a mask for selecting colors located at a precise distance from the front face , made of glass from the tube, front face on which are deposited arrays of red, green and blue phosphors to form a screen. An electron gun placed inside the tube, in its rear part, generates three? electronic harnesses towards the front face. An electromagnetic deflection device, generally placed outside the tube and close to the electron gun, has the function of deflecting the electron beams in order to make them scan the surface of the panel on which the phosphor networks are arranged. Under the influence of three electron beams each corresponding to a specific primary color, the phosphor networks allow the reproduction of color images on the screen, the mask allowing each determined beam to illuminate only the luminophore of the color. corresponding.
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 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 performed by means of a generally very rigid rectangular metal frame on which the mask is conventionally welded. The frame / mask assembly is mounted in the front face of the tube by means of suspension means welded to the frame and cooperating with pins inserted in the glass constituting the front face of the tube.
Le masque de sélection des couleurs est réalisé à partir d'une feuille métallique de très faible épaisseur et comporte une surface dite surface effective, percée d'ouvertures, lesdites ouvertures étant réalisées par gravure chimique et généralement disposées en colonnes verticales ; la surface effective est entourée d'une bordure périphérique non ajourée ; une jupe réalisée généralement par emboutissage, borde l'ensemble en s'étendant dans une direction sensiblement perpendiculaire à la surface effective. Le masque est solidarisé au cadre par une soudure par points au niveau de la jupe. Les tubes dont la face avant est de plus en plus plane correspondent à la tendance actuelle, jusqu'à évoluer vers des faces avant totalement planes avec des surfaces interne et externe définies par de très grand rayon de courbure. De manière générale, la surface du masque doit suit la forme de la partie interne de la face avant du tube, de telle manière que leur courbure soit sensiblement identique. Le masque de sélection des couleurs d'un tube conventionnel a une surface définie par des profils horizontaux et verticaux dont les rayons de courbures sont faibles, de l'ordre de un ou deux mètres dans la zone centrale ; cette surface courbe peut être représentée par une expression polynomiale complexe et la faible valeur des rayons de courbures assure la rigidité mécanique de la surface du masque .The color selection mask is produced from a very thin metal sheet and comprises a surface known as an effective surface, pierced with openings, said openings being produced by chemical etching and generally arranged in vertical columns; the effective surface is surrounded by a non-perforated peripheral border; a skirt generally produced by stamping, borders the assembly, extending in a direction substantially perpendicular to the effective surface. The mask is secured to the frame by spot welding at the skirt. The tubes whose front face is more and more flat correspond to the current trend, until evolving towards completely flat front faces with internal and external surfaces defined by very large radius of curvature. In general, the surface of the mask must follow the shape of the internal part of the front face of the tube, so that their curvature is substantially identical. The color selection mask of a conventional tube has a surface defined by horizontal and vertical profiles with small radii of curvature, of the order of one or two meters in the central area; this curved surface can be represented by a complex polynomial expression and the low value of the radii of curvature ensures the mechanical rigidity of the mask surface.
Dans le cas de tube dont l'aspect de l'écran est plan, les rayons de courbure définissant la surface du masque sont également des grandes valeurs. Dans ce cas, la surface du masque faisant face à I 'écran du tube se trouve être sensiblement plane et il en résulte une faible rigidité mécanique qui rend ledit masque très sensible aux vibrations extérieures, induites par exemples par les haut-parleurs du téléviseur équipé dudit tube ; le masque se met alors à vibrer entraînant des modifications de sa distance à l'écran ce qui provoque des décoloration de l'image formée sur ledit écran. Divers dispositifs ont été développés pour éviter les vibrations du masque en essayant de rigidifier la surface du masque sans donner de complète satisfaction.In the case of a tube with a flat screen appearance, the radii of curvature defining the mask surface are also large values. In this case, the surface of the mask facing the screen of the tube is found to be substantially flat and this results in low mechanical rigidity which makes said mask very sensitive to external vibrations, induced for example by the loudspeakers of the television set equipped said tube; the mask then begins to vibrate, causing changes in its distance to the screen, which causes discoloration of the image formed on said screen. Various devices have been developed to avoid vibrations of the mask by trying to stiffen the surface of the mask without giving complete satisfaction.
Le brevet US6111348 propose une solution consistant à rigidifier la surface du masque en créant sur ladite surface des stries verticales.US Pat. No. 6,111,348 proposes a solution consisting in stiffening the surface of the mask by creating vertical streaks on said surface.
Le brevet US4645968 divulgue une structure cadre masque pour tube à rayons cathodiques en couleurs dans laquelle la jupe du masque est soudée au cadre support, lequel cadre comporte des parties en relief venant entre les soudures au contact de la jupe du masque. Cette structure amortit partiellement les vibrations du masque, mais cette amélioration est insuffisante pour les tubes de grandes dimensions, présentant une surface de masque très plane.Patent US4645968 discloses a mask frame structure for color cathode ray tube in which the mask skirt is welded to the support frame, which frame has raised parts coming between the welds in contact with the mask skirt. This structure partially dampens the vibrations of the mask, but this improvement is insufficient for large tubes, having a very flat mask surface.
L'invention s'est intéressée aux mouvements de la jupe du masque et il a été remarqué que ces mouvements de jupe, engendrées par les vibrations provoquées dans l'environnement du tube, avait sur le comportement du masque des effets négatifs et qu'il fallait éviter ou minimiser au maximum lesdits mouvements. Pour cela le tube à rayons cathodiques en couleurs selon l'invention comporte :The invention was concerned with the movements of the mask skirt and it was noted that these skirt movements, generated by the vibrations caused in the environment of the tube, had negative effects on the behavior of the mask and that it it was necessary to avoid or minimize these movements as much as possible. For this, the color cathode ray tube according to the invention comprises:
- une face avant sensiblement rectangulaire sur la surface interne de laquelle est déposé un écran luminescent, ladite face avant étant pratiquement perpendiculaire à l'axe longitudinal Z du tube,a substantially rectangular front face on the internal surface of which a luminescent screen is deposited, said front face being practically perpendicular to the longitudinal axis Z of the tube,
- un masque de sélection des couleurs disposé face à l'écran luminescent, ledit masque comprenant une surface perforée sensiblement perpendiculaire à l'axe longitudinal Z et une jupe périphérique pliée dans une direction sensiblement parallèle à l'axe longitudinal Z, - un cadre sensiblement rectangulaire, comportant une paire de cotes longs et une paire de cotés courts, chaque cote du cadre présentant un flasque sensiblement parallèle à l'axe longitudinal Z, la jupe périphérique du masque étant soudée en plusieurs points audit flasque caractérisé en ce que le cadre comporte des ergots disposés sur le flasque du coté en contact avec la jupe du masque, lesdits ergot recouvrant au moins partiellement l'extrémité libre de ladite jupe. Les principes de l'invention ainsi que ses avantages seront mieux compris à l'aide de la description ci-après et des dessins parmi lesquels :- a color selection mask placed facing the luminescent screen, said mask comprising a perforated surface substantially perpendicular to the longitudinal axis Z and a peripheral skirt folded in a direction substantially parallel to the longitudinal axis Z, - a frame substantially rectangular, comprising a pair of long dimensions and a pair of short sides, each dimension of the frame having a flange substantially parallel to the longitudinal axis Z, the peripheral skirt of the mask being welded at several points to said flange, characterized in that the frame comprises lugs arranged on the flange on the side in contact with the mask skirt, said lug covering at least partially the free end of said skirt. The principles of the invention and its advantages will be better understood with the aid of the description below and of the drawings, among which:
- la figure 1 illustre une section d'un tube à rayons cathodique à masque de sélection des couleurs selon l'axe longitudinal - la figure 2 montre un ensemble cadre/masque selon l'invention dans une vue partielle de dessus- Figure 1 illustrates a section of a cathode ray tube with color selection mask along the longitudinal axis - Figure 2 shows a frame / mask assembly according to the invention in a partial top view
- la figure 3 est une vue en coupe transversale du mode de réalisation de la figure 2 au niveau de l'axe A'A- Figure 3 is a cross-sectional view of the embodiment of Figure 2 at the axis A'A
- la figure 4 illustre par une vue en coupe transversale d'un autre mode de réalisation au niveau de l'axe A'A- Figure 4 illustrates by a cross-sectional view of another embodiment at the axis A'A
La figure 1 montre un tube à rayons cathodiques 1 composée d'une enveloppe sous vide 2 comprenant une face avant 3 sensiblement rectangulaire et une partie arrière en forme d'entonnoir 4 se terminant par un col cylindrique 5. La face avant est définie à partir d'un axe horizontal X, parallèle à sa plus grande dimension, et d'un axe vertical Y, parallèle à sa plus petite dimension ; les axesFIG. 1 shows a cathode ray tube 1 composed of a vacuum envelope 2 comprising a substantially rectangular front face 3 and a funnel-shaped rear part 4 ending in a cylindrical neck 5. The front face is defined from a horizontal axis X, parallel to its largest dimension, and a vertical axis Y, parallel to its smallest dimension; the axes
X et Y se croisent au centre de la face avant et sont perpendiculaires à l'axe principal longitudinal Z qui passe par le centre du col cylindrique 5 et par le centre de la face avant 3.X and Y intersect at the center of the front face and are perpendicular to the main longitudinal axis Z which passes through the center of the cylindrical neck 5 and through the center of the front face 3.
Sur la partie interne de la face avant 3 est déposé un écran 6 de matériaux luminescents, ces derniers étant excités par le balayage des faisceaux électroniques 7 issus d'un canon à électrons 8 disposé dans le col du tube.On the internal part of the front face 3 is deposited a screen 6 of luminescent materials, the latter being excited by the scanning of the electron beams 7 coming from an electron gun 8 placed in the neck of the tube.
Le balayage des faisceaux électronique est réalisé par un dispositif de déflection magnétique 12 disposé sur le col du tube.The scanning of the electron beams is carried out by a magnetic deflection device 12 disposed on the neck of the tube.
A l'intérieur de l'enveloppe en verre est disposé un masque de sélection des couleurs 9 comportant une surface perforée 10, sensiblement parallèle à la surface de l'écran 6, et une jupe 11 , pliée dans une direction sensiblement parallèle à l'axe longitudinal Z.Inside the glass envelope is disposed a color selection mask 9 comprising a perforated surface 10, substantially parallel to the surface of the screen 6, and a skirt 11, folded in a direction substantially parallel to the longitudinal axis Z.
Un cadre 20, de section en forme de L, est monté à l'intérieur de l'enveloppe en verre de manière à positionner le masque à une distance précise de l'écran luminescent. Le cadre comporte un flasque 21 qui s'étend pratiquement dans une direction parallèle à l'axe Z. La jupe 11 du masque est disposée à l'intérieur du cadre et soudée par points au flasque 21. L'ensemble cadre/masque est maintenu en place dans l'enveloppe en verre grâce à des pions 13 inclus dans l'enveloppe en verre coopérant avec des ressorts solidarisés au cadre.A frame 20, of L-shaped section, is mounted inside the glass envelope so as to position the mask at a precise distance from the luminescent screen. The frame has a flange 21 which extends practically in a direction parallel to the axis Z. The skirt 11 of the mask is placed inside the frame and spot welded to the flange 21. The frame / mask assembly is held in place in the glass envelope by means of pins 13 included in the glass envelope cooperating with springs secured to the frame.
Les figures 2 et 3 illustrent un mode de réalisation de l'invention en montrant une vue partielle de dessus et une vue en coupe transversale de l'ensemble cadre/masque.Figures 2 and 3 illustrate an embodiment of the invention showing a partial top view and a cross-sectional view of the frame / mask assembly.
Le masque comporte une surface active 10 perforée entourée par une jupe 11 pliée selon une direction sensiblement parallèle à l'axe Z. La jupe se termine par un bord libre 15. La jupe est insérée à l'intérieur du cadre 20 et soudée au flasque 21 en plusieurs points 16, généralement disposés aux coins du masque et au milieu des cotés parallèles dudit masque rectangulaire. Des ergots 30 sont solidarisés au flasque du cadre en divers points de celui-ci ; ces ergots sont réalisés par exemple à partir de plaques métalliques soudées à l'une de leur extrémités 31 au flasque 21 et pliées de manière à ménager un espace 32 entre le cadre et une surface 33 de l'ergot faisant face au flasque 21, espace destiné à être partiellement occupé par la jupe 11 du masque. De cette façon, le bord libre 15 du masque est partiellement recouvert par l'ergot 30 ; à l'endroit où est disposé ledit ergot, la jupe du masque est contrainte dans l'espace libre 32, ce qui limite les mouvements de la partie libre de la jupe. Dans un tube de face avant sensiblement plane, utilisant un masque d'environ 200μm d'épaisseur, et ayant une diagonale d'écran de 68cm, l'espace 32 entre le flasque du cadre est choisi préférentiellement à une valeur D d'environ 1mm. L'expérience montre que suivant la taille du tube, l'épaisseur du masque et la fréquence principale de vibration à amortir, l'espace D est préférentiellement choisi entre 3 et 8 fois l'épaisseur du masque. Les contraintes mécaniques exercées par les ergots vont provoquer l'augmentation de la fréquence de résonance du masque et la porter à une valeur supérieure à 100hz rendant ses effets pratiquement invisibles à l'œil de l'observateur. On a observé par ailleurs que les effets des ergots étaient maximisés lorsque la largeur de recouvrement L de la jupe par l'ergot, dans la direction de l'axe Z était d'au moins 50% de la longueur de la jupe suivant cette même direction . Les ergots 30 peuvent être disposés sur une paire de cotés parallèles du cadre ou sur les quatre cotés dudit cadre. Dans le cas où une pluralité d'ergots est disposée sur des cotés parallèles du cadre, il a été découvert que des ergots devaient être préférentiellement disposés entre les points de soudure du cadre au masque.The mask has a perforated active surface 10 surrounded by a skirt 11 folded in a direction substantially parallel to the axis Z. The skirt ends in a free edge 15. The skirt is inserted inside the frame 20 and welded to the flange 21 at several points 16, generally arranged at the corners of the mask and in the middle of the parallel sides of said rectangular mask. Lugs 30 are secured to the flange of the frame at various points thereof; these lugs are produced for example from metal plates welded at one of their ends 31 to the flange 21 and folded so as to provide a space 32 between the frame and a surface 33 of the lug facing the flange 21, space intended to be partially occupied by the skirt 11 of the mask. In this way, the free edge 15 of the mask is partially covered by the lug 30; at the place where said lug is arranged, the mask skirt is constrained in the free space 32, which limits the movements of the free part of the skirt. In a substantially flat front face tube, using a mask of approximately 200 μm in thickness, and having a screen diagonal of 68 cm, the space 32 between the flange of the frame is preferably chosen at a value D of approximately 1 mm . Experience shows that depending on the size of the tube, the thickness of the mask and the main frequency of vibration to be damped, the space D is preferably chosen between 3 and 8 times the thickness of the mask. The mechanical stresses exerted by the pins will cause the increase in the resonance frequency of the mask and bring it to a value greater than 100hz making its effects practically invisible to the eye of the observer. It was also observed that the effects of the lugs were maximized when the overlap width L of the skirt by the lug, in the direction of the axis Z was at least 50% of the length of the skirt following this same direction . The pins 30 can be arranged on a pair of parallel sides of the frame or on the four sides of said frame. In the case where a plurality of lugs is arranged on parallel sides of the frame, it has been discovered that lugs should preferably be placed between the welding points of the frame to the mask.
La pluralité d'ergots disposés sur un coté du cadre peut être avantageusement remplacé par un ergot unique recouvrant plus de la moitié de la longueur de l'extrémité libre 15 du masque, s'étendant le long du coté dudit cadre. Ainsi pour le tube de diagonale égale à 68cm lorsque on dispose sur chaque coté du cadre un ergot unique selon l'invention, ergot recouvrant 90% de la longueur de l'extrémité libre du masque dans la direction parallèle au coté du cadre, la fréquence de résonance de l'ensemble cadre masque est porté à une valeur supérieure à 150 Hz, rendant les mouvements du masque invisibles à l'œil de l'observateur. Ce mode de réalisation de l'invention permet une fabrication plus rapide du cadre et offre des résultats sensiblement équivalents à l'utilisation d'une pluralité d'ergots par coté de cadre.The plurality of lugs arranged on one side of the frame can advantageously be replaced by a single lug covering more than half the length of the free end 15 of the mask, extending along the side of said frame. Thus for the diagonal tube equal to 68cm when there is on each side of the frame a single lug according to the invention, lug covering 90% of the length of the free end of the mask in the direction parallel to the side of the frame, the frequency of resonance of the mask frame assembly is brought to a value greater than 150 Hz, making the movements of the mask invisible to the eye of the observer. This embodiment of the invention allows faster production of the frame and offers results substantially equivalent to the use of a plurality of lugs per side of the frame.
Les ergots 30 peuvent être, comme illustrés dans les modes de réalisation des figures 2 et 3, constitués par des pièces rapportées et soudées au cotés du cadre. Les ergots peuvent également être réalisés à partir de la matière constituant le flasque lui-même. Pour cela, un autre mode de réalisation de l'invention est illustré par la figure 4 sous la forme d'un ergot 40. L'ergot 40 est réalisé à partir de la matière constituant le flasque 21 ; par exemple, lorsque l'ergot a une forme sensiblement rectangulaire, trois cotés de l'ergot sont formés par découpe de la matière du cadre, un coté 41 restant solidaire de celui-ci. La matière découpée est alors repoussée vers l'intérieur du cadre de manière à former une face métallique 43 sensiblement parallèle au flasque 21 et située à une distance D de celui-ci, de manière à ménager un espace 32 entre l'ergot et la flasque du cadre. The pins 30 can be, as illustrated in the embodiments of Figures 2 and 3, constituted by inserts and welded to the sides of the frame. The pins can also be made from the material constituting the flange itself. For this, another embodiment of the invention is illustrated in FIG. 4 in the form of a lug 40. The lug 40 is produced from the material constituting the flange 21; for example, when the lug has a substantially rectangular shape, three sides of the lug are formed by cutting the material of the frame, one side 41 remaining integral with the latter. The cut material is then pushed towards the inside of the frame so as to form a metal face 43 substantially parallel to the flange 21 and located at a distance D from the latter, so as to provide a space 32 between the lug and the flange of the frame.

Claims

REVENDICATIONS
1/ Tube à rayons cathodiques en couleurs comportant : - une face avant (3) sensiblement rectangulaire sur la surface interne de laquelle est déposé un écran luminescent (6), ladite face avant étant pratiquement perpendiculaire à l'axe longitudinal Z du tube,1 / Color cathode ray tube comprising: - a substantially rectangular front face (3) on the internal surface of which a luminescent screen (6) is deposited, said front face being practically perpendicular to the longitudinal axis Z of the tube,
- un masque de sélection des couleurs (9) disposé face à l'écran luminescent, ledit masque comprenant une surface perforée (10) sensiblement perpendiculaire à l'axe longitudinal Z et une jupe périphérique (11) pliée dans une direction sensiblement parallèle à l'axe longitudinal Z,- a color selection mask (9) disposed facing the luminescent screen, said mask comprising a perforated surface (10) substantially perpendicular to the longitudinal axis Z and a peripheral skirt (11) folded in a direction substantially parallel to the 'longitudinal axis Z,
- un cadre (20) sensiblement rectangulaire, comportant une paire de cotés longs et une paire de cotés courts, chaque coté du cadre présentant un flasque (21) sensiblement parallèle à l'axe longitudinal Z, la jupe périphérique du masque étant soudée en plusieurs points (16) audit flasque caractérisé en ce que le cadre comporte des ergots (30, 40) disposés sur le flasque du coté en contact avec la jupe du masque, lesdits ergot recouvrant au moins partiellement l'extrémité libre (15) de ladite jupe.- A substantially rectangular frame (20), comprising a pair of long sides and a pair of short sides, each side of the frame having a flange (21) substantially parallel to the longitudinal axis Z, the peripheral skirt of the mask being welded in several points (16) on said flange, characterized in that the frame comprises lugs (30, 40) arranged on the flange on the side in contact with the mask skirt, said lug at least partially covering the free end (15) of said skirt .
2/ Tube à rayons cathodiques selon la revendication précédente caractérisé en ce que des cotés opposés du cadre comporte un ergot (40) s'étendant sur au moins 90% de la longueur de l'extrémité libre (15) du masque dans la direction parallèle aux cotés du cadre sur lequel l'ergot est solidarisé.2 / cathode ray tube according to the preceding claim characterized in that opposite sides of the frame comprises a lug (40) extending over at least 90% of the length of the free end (15) of the mask in the parallel direction alongside the frame on which the lug is secured.
3/ Tube à rayons cathodiques selon la revendication 1 caractérisé en ce des ergots (30, 40) s'étendent dans la direction de l'axe longitudinal Z de manière à recouvrir au moins 50% de la longueur de la jupe suivant cette même direction .3 / cathode ray tube according to claim 1 characterized in that lugs (30, 40) extend in the direction of the longitudinal axis Z so as to cover at least 50% of the length of the skirt in this same direction .
4/ Tube à rayons cathodiques selon la revendication 1 caractérisé en ce des ergots (30, 40) sont réalisés par découpe partielle du matériau du cadre. 5/ Tube à rayons cathodiques selon la revendication 1 caractérisé en ce que l'espace D ménagé entre un ergot et la surface du flasque est compris entre 3 et 8 fois l'épaisseur du masque. 4 / cathode ray tube according to claim 1 characterized in that lugs (30, 40) are made by partial cutting of the frame material. 5 / cathode ray tube according to claim 1 characterized in that the space D formed between a lug and the surface of the flange is between 3 and 8 times the thickness of the mask.
EP03812080A 2003-01-20 2003-12-23 Colour cathode ray tube with essentially flat screen Withdrawn EP1586105A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT000076A ITMI20030076A1 (en) 2003-01-20 2003-01-20 MASK / FRAME COUPLING TO IMPROVE MICROPHONE IN CATHODE TUBES WITH SUBSTANTIALLY FLAT PRINTED MASK.
ITMI20030076 2003-01-20
PCT/FR2003/050209 WO2004068528A2 (en) 2003-01-20 2003-12-23 Colour cathode ray tube with essentially flat screen

Publications (1)

Publication Number Publication Date
EP1586105A2 true EP1586105A2 (en) 2005-10-19

Family

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EP03812080A Withdrawn EP1586105A2 (en) 2003-01-20 2003-12-23 Colour cathode ray tube with essentially flat screen

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US (1) US20060267473A1 (en)
EP (1) EP1586105A2 (en)
JP (1) JP2006513549A (en)
KR (1) KR20050092428A (en)
CN (1) CN1735954A (en)
AU (1) AU2003302760A1 (en)
IT (1) ITMI20030076A1 (en)
WO (1) WO2004068528A2 (en)

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Publication number Priority date Publication date Assignee Title
KR101995500B1 (en) 2012-11-20 2019-10-02 삼성디스플레이 주식회사 Mask and mask assembly

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Publication number Priority date Publication date Assignee Title
US3553517A (en) * 1969-04-21 1971-01-05 Sylvania Electric Prod Support means for a color cathode ray tube shadow mask member having smooth circumferential seating contact
FR2555808B1 (en) * 1983-11-25 1986-10-10 Videocolor SHADOW MASK FOR COLOR IMAGE TUBE AND IMAGE TUBE COMPRISING SAME
JPS60127641A (en) * 1983-12-13 1985-07-08 Matsushita Electric Ind Co Ltd Shadow mask for color picture tube
JPS62223948A (en) * 1986-03-26 1987-10-01 Hitachi Ltd Shadow mask assembling structure
US4994712A (en) * 1989-05-03 1991-02-19 Zenith Electronics Corporation Foil shadow mask mounting with low thermal expansion coefficient
NL8902997A (en) * 1989-12-06 1991-07-01 Philips Nv COLOR IMAGE TUBE.
KR930006734Y1 (en) * 1991-06-08 1993-10-06 삼성전관 주식회사 Flame assembling structure of shadow mask
JPH1140072A (en) * 1997-07-24 1999-02-12 Nec Kansai Ltd Shadow mask structure
US6046535A (en) * 1997-07-30 2000-04-04 Samsung Display Devices Co., Ltd. Shadow mask frame assembly for a cathode ray tube

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Title
See references of WO2004068528A2 *

Also Published As

Publication number Publication date
US20060267473A1 (en) 2006-11-30
AU2003302760A1 (en) 2004-08-23
KR20050092428A (en) 2005-09-21
ITMI20030076A1 (en) 2004-07-21
CN1735954A (en) 2006-02-15
AU2003302760A8 (en) 2004-08-23
JP2006513549A (en) 2006-04-20
WO2004068528A3 (en) 2004-09-10
WO2004068528A2 (en) 2004-08-12

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