EP0851454A1 - Suspension device for a shadow mask of a display cathode ray tube using a bimetal and bimetal - Google Patents

Suspension device for a shadow mask of a display cathode ray tube using a bimetal and bimetal Download PDF

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Publication number
EP0851454A1
EP0851454A1 EP97402908A EP97402908A EP0851454A1 EP 0851454 A1 EP0851454 A1 EP 0851454A1 EP 97402908 A EP97402908 A EP 97402908A EP 97402908 A EP97402908 A EP 97402908A EP 0851454 A1 EP0851454 A1 EP 0851454A1
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EP
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Prior art keywords
shadow mask
deflection
bimetallic strip
bimetal
less
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Granted
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EP97402908A
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German (de)
French (fr)
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EP0851454B1 (en
Inventor
Jean-François Tiers
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Aperam Stainless Precision SAS
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Imphy SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • 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
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0705—Mounting arrangement of assembly to vessel
    • H01J2229/0711—Spring and plate (clip) type

Definitions

  • the invention relates to a device for suspending the shadow mask of a cathode ray tube.
  • a color cathode-ray display tube has, between the screen of visualization equipped with phosphors and the electron gun, a shadow mask consisting of a metal sheet pierced with a multitude of holes. This mask shadow is intended to ensure good separation of the three electron beams from the electron gun, so that each electron beam does not reach as the phosphor corresponding to the color associated with it. Good alignment of electron beams, phosphors and mask holes shade is required to obtain a good quality image.
  • the shadow mask heats up (its temperature can reach 130 ° C), it expands, and, in the absence of provisions particular, this dilation generates a misalignment of the beams electrons, phosphors and shadow mask holes. This results in a loss image quality.
  • the shadow mask is suspended from the glass slab which constitutes the screen by thermostatic bimetallic strips generally made of an austenitic stainless steel and a Fe-Ni alloy the chemical composition of which comprises, by weight, from 36% to 42% of nickel.
  • These bimetallic strips which can be of the type "welded on edge” or of the type "plated”, have a linear behavior, i.e. a linear variation of the deflection with the temperature, at least up to temperatures of the order of 200 ° C.
  • the bimetallic strips heat up at the same time as the shadow mask and deform in such a way that the distance from the shadow mask to the display screen is adjusted according to the temperature of the shadow mask. This results in compensation for the effects caused by the heating of the shadow mask.
  • the temperature of the tube itself can increase significantly due to temperature ambient to reach, for example, 50 ° C. Under these conditions, the compensation of the heating effect of the shadow mask is no longer satisfactory. There is overcompensation.
  • the object of the present invention is to remedy this drawback by proposing a way to limit, even avoid, the phenomenon of overcompensation.
  • the invention relates to a device for suspending the mask shadow of a cathode-ray display tube, the device comprising a bimetallic strip thermostatic whose deflection between 60 ° C and 130 ° C is less than the deflection between 20 ° C and 60 ° C.
  • the deflection of the bimetallic strip between 60 ° C and 130 ° C is less than 0.8 times, and better still, 0.65 times, the deflection of the bimetallic strip between 20 ° C and 60 ° C.
  • the bimetallic strip which is also part of the invention and whose deflection between 60 ° C and 130 ° C is less than the deflection between 20 ° C and 60 ° C, can be of the type welded on edge or plated type.
  • it consists of at least one austenitic stainless steel and an Fe-Ni alloy whose chemical composition comprises, by weight, from 27% to 32% of nickel.
  • FIG. 1 represents a device for suspending the shadow mask of a cathode-ray display tube comprising a bimetallic strip welded to the edge (the screen of the cathode ray tube and shadow mask are only partially shown).
  • FIG. 2 represents a device for suspending the shadow mask of a cathode-ray display tube comprising a plated bimetal strip (the screen of the tube cathodic and the shadow mask are only partially represented).
  • the shadow mask 1, 1 ' consisting essentially of a metal sheet 2, 2 'pierced with a multitude of holes 3.3' and mounted on a rigid frame 4, 4 ′ disposed at its periphery, is arranged opposite the display screen 5, 5 'consisting of a glass slab 6, 6' provided with edges peripherals 7, 7 ', and comprising, facing the shadow mask 1, 1', a layer 8, 8 ' phosphors.
  • the shadow mask 1 is suspended from the glass slab 6 by a suspension means 8 consisting of an anchor pin 9 and a bimetallic strip 10 of the type "welded on edge", that is to say, cut astride the junction line 11 of two metal bands 12 and 13 of a different nature.
  • the anchor pin 9 is sealed in the rim 7 of the glass slab 6.
  • the bimetallic strip 10 has at one of its ends a hole 14 in which is threaded the anchor pin 9; at the other end, it is fixed by welding to the rigid frame 4.
  • the shadow mask 1 ′ is suspended from the glass slab 6 ′ by a 8 'suspension means consisting of an anchor pin 9', a bimetallic strip 10 'of the type plated, that is to say, cut in two metal strips 12 'and 13' of nature different, pressed one on the other, for example, by co-laminating, and a spring 15.
  • the anchor pin 9 ' is sealed in the rim 7' of the glass slab 6 '.
  • the bimetallic strip 10 ' has at one of its ends a hole 14' in which the anchor pin 9; at the other end, it is fixed by welding to the rigid frame 4 by through the spring 15.
  • the bimetallic strip 10 or 10 In order to obtain satisfactory compensation both when the visualization (in particular the 7 or 7 'rim of the 6 or 6' glass slab) is ordinary temperature, i.e. around 20 ° C, that when heated, by example around 50 ° C, the bimetallic strip 10 or 10 'has a deflection between 60 ° C and 130 ° C lower than the deflection it has between 20 ° C and 60 ° C; the deflection of the bimetallic strip between two temperatures being, for a bimetallic strip one end of which is free and the other fixed, the displacement of the free end generated by the passage of the entire bimetallic strip from one temperature to another.
  • the deflection between 60 ° C and 130 ° C less than 0.8 times, and better still, 0.65 times, the deflection between 20 ° C and 60 ° C.
  • the shadow mask heats up, it expands and the distance between the holes that it involves increases.
  • this is what bimetallic strips do average temperature is balanced between the temperature of the edge of the glass slab and the temperature of the shadow mask.
  • the optimal position setting of the shadow mask relative to the screen depends only on the temperature of the shadow mask.
  • the temperature mean bimetal is higher the higher the temperature of the edge of the glass slab, it follows that the deflection of the bimetallic strip caused by heating of the shadow mask is accentuated by the possible heating of the edge of the slab of glass. This additional deflection is a parasitic effect which must be minimized, and the inventors have found that this effect is all the more minimized when the bimetallic strip is not very sensitive to temperature variations at the top of its range operating temperatures.
  • bimetallic strips 10 and 10 ' are, for one, an austenitic stainless steel, for example, type 304 (according to ASTM standard), for the other, a Fe-Ni alloy whose composition chemical comprises, by weight, from 27% to 32% of nickel.
  • the bimetallic strips thus obtained have a deflection between 60 ° C and 130 ° C less than the deflection they have between 20 ° C and 60 ° C.
  • the Fe-Ni alloy can be an alloy whose composition chemical comprises, by weight, about 30.9% nickel, about 1.2% manganese, about 0.15% silicon, about 0.15% carbon, the rest being iron and impurities resulting from processing.
  • the deflection between 60 ° C and 130 ° C is about 0.76 times the deflection between 20 ° C and 60 ° C.
  • the Fe-Ni alloy can also be an alloy whose chemical composition comprises, by weight, approximately 29.3% of nickel, approximately 1.2% of manganese, about 0.15% silicon, about 0.15% carbon, the rest being iron and impurities resulting from processing.
  • the deflection between 60 ° C and 130 ° C is about 0.61 times the deflection between 20 ° C and 60 ° C, which is more favorable than the previous case to limit overcompensation.
  • the choice of the two materials from which the two layers of the bimetal is not limited to the examples cited. Indeed the Man of the Trade can choose these materials after having determined, for example by dilatometry tests, the evolution of their coefficient of expansion in the temperature range of envisaged operation, then by simulating by calculation the behavior of a bimetal made of these two materials.
  • the two operating ranges (20 ° C / 60 ° C and 60 ° C / 130 ° C) can be adapted on a case-by-case basis depending on the particular characteristics of the cathode-ray display tube on which they are mounted.
  • the bimetallic strips comprise, in addition to the two layers which have just been described, an additional layer, for example of copper, whose purpose is to improve the longitudinal thermal conductivity of the bimetallic strip.

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  • Electrodes For Cathode-Ray Tubes (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • External Artificial Organs (AREA)
  • Physical Water Treatments (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Coloring (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Food-Manufacturing Devices (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

A suspension device (8) for a CRT shadow mask (1) consists of a thermostatic bimetallic strip (10) exhibiting a deflection at 60-130 degrees C which is less than (preferably less than 0.8, especially less than 0.65 times) that at 20-60 degrees C. Also claimed is a bimetallic strip exhibiting a deflection at 60-130 degrees C which is less than that at 20-60 degrees C and which preferably consists of an austenitic stainless steel and an Fe-Ni alloy containing 27-32 wt.% Ni.

Description

L'invention est relative à un dispositif de suspension du masque d'ombre d'un tube de visualisation cathodique.The invention relates to a device for suspending the shadow mask of a cathode ray tube.

Un tube de visualisation cathodique en couleur comporte, entre l'écran de visualisation muni de luminophores et le canon à électrons, un masque d'ombre constitué d'une feuille métallique percée d'une multitude de trous. Ce masque d'ombre est destiné à assurer une bonne séparation des trois faisceaux électrons issus du canon à électrons, de telle sorte que chaque faisceau d'électrons n'atteigne que le luminophore correspondant à la couleur qui lui est associée. Le bon alignement des faisceaux électrons, des luminophores et des trous du masque d'ombre est nécessaire pour obtenir une image de bonne qualité.A color cathode-ray display tube has, between the screen of visualization equipped with phosphors and the electron gun, a shadow mask consisting of a metal sheet pierced with a multitude of holes. This mask shadow is intended to ensure good separation of the three electron beams from the electron gun, so that each electron beam does not reach as the phosphor corresponding to the color associated with it. Good alignment of electron beams, phosphors and mask holes shade is required to obtain a good quality image.

Lorsque le tube est en fonctionnement, le masque d'ombre s'échauffe (sa température peut atteindre 130 °C), il se dilate, et, en l'absence de dispositions particulières, cette dilatation engendre un mauvais alignement des faisceaux électrons, des luminophores et des trous du masque d'ombre. Il en résulte une perte de qualité de l'image.When the tube is in operation, the shadow mask heats up (its temperature can reach 130 ° C), it expands, and, in the absence of provisions particular, this dilation generates a misalignment of the beams electrons, phosphors and shadow mask holes. This results in a loss image quality.

Pour compenser cette dilatation intempestive, le masque d'ombre est suspendu à la dalle de verre qui constitue l'écran par des bilame thermostatiques constitués généralement d'un acier inoxydable austénitique et d'un alliage Fe-Ni dont la composition chimique comprend, en poids, de 36 % à 42 % de nickel. Ces bilames qui peuvent être du type "soudés sur chant" ou du type "plaqués", ont un comportement linéaire, c'est à dire une variation linéaire de la déflexion avec la température, au moins jusqu'à des températures de l'ordre de 200 °C. Les bilames s'échauffent en même temps que le masque d'ombre et se déforment de telle façon que la distance du masque d'ombre à l'écran de visualisation s'ajuste en fonction de la température du masque d'ombre. Il en résulte une compensation des effets engendrés par l'échauffement du masque d'ombre. Cependant, la température du tube lui même peut augmenter de façon significative sous l'effet de la température ambiante pour atteindre, par exemple, 50 °C. Dans ces conditions, la compensation de l'effet d'échauffement du masque d'ombre n'est plus satisfaisante. Il y a surcompensation.To compensate for this untimely expansion, the shadow mask is suspended from the glass slab which constitutes the screen by thermostatic bimetallic strips generally made of an austenitic stainless steel and a Fe-Ni alloy the chemical composition of which comprises, by weight, from 36% to 42% of nickel. These bimetallic strips which can be of the type "welded on edge" or of the type "plated", have a linear behavior, i.e. a linear variation of the deflection with the temperature, at least up to temperatures of the order of 200 ° C. The bimetallic strips heat up at the same time as the shadow mask and deform in such a way that the distance from the shadow mask to the display screen is adjusted according to the temperature of the shadow mask. This results in compensation for the effects caused by the heating of the shadow mask. However, the temperature of the tube itself can increase significantly due to temperature ambient to reach, for example, 50 ° C. Under these conditions, the compensation of the heating effect of the shadow mask is no longer satisfactory. There is overcompensation.

Le but de la présente invention est de remédier à cet inconvénient en proposant un moyen pour limiter, voire éviter, le phénomène de surcompensation.The object of the present invention is to remedy this drawback by proposing a way to limit, even avoid, the phenomenon of overcompensation.

A cet effet, l'invention a pour objet un dispositif de suspension du masque d'ombre d'un tube de visualisation cathodique, le dispositif comprenant un bilame thermostatique dont la déflexion entre 60 °C et 130 °C est inférieure à la déflexion entre 20 °C et 60 °C. To this end, the invention relates to a device for suspending the mask shadow of a cathode-ray display tube, the device comprising a bimetallic strip thermostatic whose deflection between 60 ° C and 130 ° C is less than the deflection between 20 ° C and 60 ° C.

De préférence, la déflexion du bilame entre 60 °C et 130 °C est inférieure à 0,8 fois, et mieux encore, 0,65 fois, la déflexion du bilame entre 20 °C et 60 °C.Preferably, the deflection of the bimetallic strip between 60 ° C and 130 ° C is less than 0.8 times, and better still, 0.65 times, the deflection of the bimetallic strip between 20 ° C and 60 ° C.

Le bilame, qui fait également partie de l'invention et dont la déflexion entre 60 °C et 130 °C est inférieure à la déflexion entre 20 °C et 60 °C, peut être du type soudé sur chant ou du type plaqué. De préférence, il est constitué au moins d'un acier inoxydable austénitique et d'un alliage Fe-Ni dont la composition chimique comprend, en poids, de 27 % à 32 % de nickel.The bimetallic strip, which is also part of the invention and whose deflection between 60 ° C and 130 ° C is less than the deflection between 20 ° C and 60 ° C, can be of the type welded on edge or plated type. Preferably, it consists of at least one austenitic stainless steel and an Fe-Ni alloy whose chemical composition comprises, by weight, from 27% to 32% of nickel.

L'invention va maintenant être décrite plus en détail en regard des figures annexées.The invention will now be described in more detail with reference to the figures attached.

La figure 1 représente un dispositif de suspension du masque d'ombre d'un tube de visualisation cathodique comprenant un bilame soudé sur chant (l'écran du tube cathodique et le masque d'ombre ne sont représentés que partiellement).FIG. 1 represents a device for suspending the shadow mask of a cathode-ray display tube comprising a bimetallic strip welded to the edge (the screen of the cathode ray tube and shadow mask are only partially shown).

La figure 2 représente un dispositif de suspension du masque d'ombre d'un tube de visualisation cathodique comprenant un bilame plaqué (l'écran du tube cathodique et le masque d'ombre ne sont représentés que partiellement).FIG. 2 represents a device for suspending the shadow mask of a cathode-ray display tube comprising a plated bimetal strip (the screen of the tube cathodic and the shadow mask are only partially represented).

Aussi bien à la figure 1 qu'à la figure 2, le masque d'ombre 1, 1', constitué essentiellement d'une feuille métallique 2, 2' percée d'une multitude trous 3,3' et monté sur un cadre rigide 4, 4' disposé à sa périphérie, est disposé en regard de l'écran de visualisation 5, 5' constitué d'une dalle de verre 6, 6' munie de rebords périphériques 7, 7', et comportant, face au masque d'ombre 1, 1', une couche 8, 8' de luminophores.In both Figure 1 and Figure 2, the shadow mask 1, 1 ', consisting essentially of a metal sheet 2, 2 'pierced with a multitude of holes 3.3' and mounted on a rigid frame 4, 4 ′ disposed at its periphery, is arranged opposite the display screen 5, 5 'consisting of a glass slab 6, 6' provided with edges peripherals 7, 7 ', and comprising, facing the shadow mask 1, 1', a layer 8, 8 ' phosphors.

A la figure 1, le masque d'ombre 1 est suspendu à la dalle de verre 6 par un moyen de suspension 8 constitué d'un pion d'ancrage 9 et d'un bilame 10 du type "soudé sur chant", c'est à dire, découpé à cheval de la ligne de jonction 11 de deux bandes métalliques 12 et 13 de nature différente. Le pion d'ancrage 9 est scellé dans le rebord 7 de la dalle de verre 6. Le bilame 10 comporte à l'une de ses extrémités un trou 14 dans lequel est enfilé le pion d'ancrage 9 ; à l'autre extrémité, il est fixé par soudage au cadre rigide 4.In FIG. 1, the shadow mask 1 is suspended from the glass slab 6 by a suspension means 8 consisting of an anchor pin 9 and a bimetallic strip 10 of the type "welded on edge", that is to say, cut astride the junction line 11 of two metal bands 12 and 13 of a different nature. The anchor pin 9 is sealed in the rim 7 of the glass slab 6. The bimetallic strip 10 has at one of its ends a hole 14 in which is threaded the anchor pin 9; at the other end, it is fixed by welding to the rigid frame 4.

A la figure 2, le masque d'ombre 1' est suspendu à la dalle de verre 6' par un moyen de suspension 8' constitué d'un pion d'ancrage 9', d'un bilame 10' du type plaqué, c'est à dire, découpé dans deux bandes métalliques 12' et 13' de nature différente, plaquées l'une sur l'autre, par exemple, par colaminage, et d'un ressort 15. Le pion d'ancrage 9' est scellé dans le rebord 7' de la dalle de verre 6'. Le bilame 10' comporte à l'une de ses extrémités un trou 14' dans lequel est enfilé le pion d'ancrage 9 ; à l'autre extrémité, il est fixé par soudage au cadre rigide 4 par l'intermédiaire du ressort 15.In FIG. 2, the shadow mask 1 ′ is suspended from the glass slab 6 ′ by a 8 'suspension means consisting of an anchor pin 9', a bimetallic strip 10 'of the type plated, that is to say, cut in two metal strips 12 'and 13' of nature different, pressed one on the other, for example, by co-laminating, and a spring 15. The anchor pin 9 'is sealed in the rim 7' of the glass slab 6 '. The bimetallic strip 10 'has at one of its ends a hole 14' in which the anchor pin 9; at the other end, it is fixed by welding to the rigid frame 4 by through the spring 15.

Afin d'obtenir une compensation satisfaisante aussi bien lorsque le tube de visualisation (en particulier le rebord 7 ou 7' de la dalle de verre 6 ou 6') est à la température ordinaire, c'est à dire environ 20 °C, que lorsqu'il est échauffé, par exemple vers 50 °C, le bilame 10 ou 10' a une déflexion entre 60 °C et 130 °C inférieure à la déflexion qu'il a entre 20 °C et 60 °C ; la déflexion du bilame entre deux températures étant, pour un bilame dont une extrémité est libre et l'autre fixe, le déplacement de extrémité libre engendré par le passage de l'ensemble du bilame d'une température à l'autre. De préférence, la déflexion entre 60 °C et 130 °C inférieure à 0,8 fois, et mieux encore, 0,65 fois, la déflexion entre 20 °C et 60 °C. En effet, lorsque le masque d'ombre s'échauffe, il se dilate et la distance entre les trous qu'il comporte augmente. Pour compenser l'effet de cette dilatation, il faut rapprocher le masque d'ombre de l'écran, c'est ce que font les bilames dont la température moyenne s'équilibre entre la température du rebord de la dalle de verre et la température du masque d'ombre. Cependant, le réglage optimal de la position du masque d'ombre par rapport à l'écran, ne dépend que de la température du masque d'ombre. Or, à température égale du masque d'ombre, la température moyenne du bilame est d'autant plus élevée que la température du rebord de la dalle de verre, il en résulte que la déflexion du bilame engendrée par l'échauffement du masque d'ombre est accentuée par l'échauffement éventuel du rebord de la dalle de verre. Ce surcroít de déflexion est un effet parasite qui doit être minimisé, et les inventeurs ont constaté que cet effet est d'autant plus minimisé que le bilame est peu sensible aux variations de température dans le haut de sa plage de températures de fonctionnement.In order to obtain satisfactory compensation both when the visualization (in particular the 7 or 7 'rim of the 6 or 6' glass slab) is ordinary temperature, i.e. around 20 ° C, that when heated, by example around 50 ° C, the bimetallic strip 10 or 10 'has a deflection between 60 ° C and 130 ° C lower than the deflection it has between 20 ° C and 60 ° C; the deflection of the bimetallic strip between two temperatures being, for a bimetallic strip one end of which is free and the other fixed, the displacement of the free end generated by the passage of the entire bimetallic strip from one temperature to another. Preferably, the deflection between 60 ° C and 130 ° C less than 0.8 times, and better still, 0.65 times, the deflection between 20 ° C and 60 ° C. In effect, when the shadow mask heats up, it expands and the distance between the holes that it involves increases. To compensate for the effect of this expansion, bring the shadow mask closer to the screen, this is what bimetallic strips do, average temperature is balanced between the temperature of the edge of the glass slab and the temperature of the shadow mask. However, the optimal position setting of the shadow mask relative to the screen, depends only on the temperature of the shadow mask. However, at equal temperature of the shadow mask, the temperature mean bimetal is higher the higher the temperature of the edge of the glass slab, it follows that the deflection of the bimetallic strip caused by heating of the shadow mask is accentuated by the possible heating of the edge of the slab of glass. This additional deflection is a parasitic effect which must be minimized, and the inventors have found that this effect is all the more minimized when the bimetallic strip is not very sensitive to temperature variations at the top of its range operating temperatures.

Aussi bien dans le cas de la figure 1 que dans celui de la figure 2, les deux matériaux qui constituent les bandes 12 et 12' d'une part, 13 et 13' d'autre part, des bilames 10 et 10', sont, pour l'un, un acier inoxydable austénitique, par exemple, du type 304 (selon la norme ASTM), pour l'autre, un alliage Fe-Ni dont la composition chimique comprend, en poids, de 27 % à 32 % de nickel. Les bilames ainsi obtenus ont une déflexion entre 60 °C et 130 °C inférieure à la déflexion qu'ils ont entre 20 °C et 60 °C.Both in Figure 1 and in Figure 2, both materials which constitute the strips 12 and 12 'on the one hand, 13 and 13' on the other hand, bimetallic strips 10 and 10 'are, for one, an austenitic stainless steel, for example, type 304 (according to ASTM standard), for the other, a Fe-Ni alloy whose composition chemical comprises, by weight, from 27% to 32% of nickel. The bimetallic strips thus obtained have a deflection between 60 ° C and 130 ° C less than the deflection they have between 20 ° C and 60 ° C.

Plus précisément, l'alliage Fe-Ni peut être un alliage dont la composition chimique comprend, en poids, environ 30,9 % de nickel, environ 1,2 % de manganèse, environ 0,15 % de silicium, environ 0,15 % de carbone, le reste étant du fer et des impuretés résultant de l'élaboration. Dans ce cas, la déflexion entre 60 °C et 130 °C est d'environ 0,76 fois la déflexion entre 20 °C et 60 °C.More specifically, the Fe-Ni alloy can be an alloy whose composition chemical comprises, by weight, about 30.9% nickel, about 1.2% manganese, about 0.15% silicon, about 0.15% carbon, the rest being iron and impurities resulting from processing. In this case, the deflection between 60 ° C and 130 ° C is about 0.76 times the deflection between 20 ° C and 60 ° C.

L'alliage Fe-Ni peut, également, être un alliage dont la composition chimique comprend, en poids, environ 29,3 % de nickel, environ 1,2 % de manganèse, environ 0,15 % de silicium, environ 0,15 % de carbone, le reste étant du fer et des impuretés résultant de l'élaboration. Dans ce cas, la déflexion entre 60 °C et 130 °C est d'environ 0,61 fois la déflexion entre 20 °C et 60 °C, ce qui est plus favorable que le cas précédent pour limiter la surcompensation.The Fe-Ni alloy can also be an alloy whose chemical composition comprises, by weight, approximately 29.3% of nickel, approximately 1.2% of manganese, about 0.15% silicon, about 0.15% carbon, the rest being iron and impurities resulting from processing. In this case, the deflection between 60 ° C and 130 ° C is about 0.61 times the deflection between 20 ° C and 60 ° C, which is more favorable than the previous case to limit overcompensation.

Le choix des deux matériaux dont sont constituées les deux couches du bilame n'est pas limité aux exemples cités. En effet L'Homme du Métier peut choisir ces matériaux après avoir déterminé, par exemple par des essais de dilatométrie, l'évolution de leurs coefficient de dilatation dans la plage de température de fonctionnement envisagée, puis en simulant par le calcul le comportement d'un bilame constitué de ces deux matériaux.The choice of the two materials from which the two layers of the bimetal is not limited to the examples cited. Indeed the Man of the Trade can choose these materials after having determined, for example by dilatometry tests, the evolution of their coefficient of expansion in the temperature range of envisaged operation, then by simulating by calculation the behavior of a bimetal made of these two materials.

De même, les deux plages de fonctionnement (20 °C/60 °C et 60 °C/130 °C) peuvent être adaptées au cas par cas en fonction des caractéristiques particulières du tube de visualisation cathodique sur lequel ils sont montés.Likewise, the two operating ranges (20 ° C / 60 ° C and 60 ° C / 130 ° C) can be adapted on a case-by-case basis depending on the particular characteristics of the cathode-ray display tube on which they are mounted.

On peut noter que, parfois, les bilames comportent, outre les deux couches qui viennent d'être décrites, une couche supplémentaire, par exemple en cuivre, dont le but est d'améliorer la conductibilité thermique longitudinale du bilame.It can be noted that, sometimes, the bimetallic strips comprise, in addition to the two layers which have just been described, an additional layer, for example of copper, whose purpose is to improve the longitudinal thermal conductivity of the bimetallic strip.

Claims (8)

Dispositif de suspension (8, 8') du masque d'ombre (1, 1') d'un tube de visualisation cathodique, du type comprenant un bilame thermostatique (10, 10'), caractérisé en ce que la déflexion du bilame (10, 10') entre 60 °C et 130 °C est inférieure à la déflexion du bilame entre 20 °C et 60 °C.Device for hanging (8, 8 ') the shadow mask (1, 1') of a tube cathodic display, of the type comprising a thermostatic bimetallic strip (10, 10 '), characterized in that the deflection of the bimetallic strip (10, 10 ') between 60 ° C and 130 ° C is lower than the bimetallic deflection between 20 ° C and 60 ° C. Dispositif de suspension du masque d'ombre (1, 1') selon la revendication 1 caractérisé en ce que la déflexion du bilame (10, 10') entre 60 °C et 130 °C est inférieure à 0,8 fois la déflexion du bilame entre 20 °C et 60 °C.Device for hanging the shadow mask (1, 1 ') according to claim 1 characterized in that the deflection of the bimetallic strip (10, 10 ') between 60 ° C and 130 ° C is less than 0.8 times the deflection of the bimetallic strip between 20 ° C and 60 ° C. Dispositif de suspension du masque d'ombre selon la revendication 1 caractérisé en ce que la déflexion du bilame (10, 10') entre 60 °C et 130 °C est inférieure à 0,65 fois la déflexion du bilame entre 20 °C et 60 °C.Shadow mask suspension device according to claim 1 characterized in that the deflection of the bimetallic strip (10, 10 ') between 60 ° C and 130 ° C is less than 0.65 times the deflection of the bimetallic strip between 20 ° C and 60 ° C. Dispositif de suspension du masque d'ombre selon l'une quelconque des revendications 1 à 3 caractérisé en ce que le bilame (10) est du type soudé sur chant.Device for hanging the shadow mask according to any one of Claims 1 to 3 characterized in that the bimetallic strip (10) is of the type welded to singing. Dispositif de suspension du masque d'ombre selon l'une quelconque des revendications 1 à 3 caractérisé en ce que le bilame (10') est du type plaqué.Device for hanging the shadow mask according to any one of Claims 1 to 3 characterized in that the bimetallic strip (10 ') is of the plated type. Dispositif de suspension du masque d'ombre selon l'une quelconque des revendications 1 à 3 caractérisé en ce que le bilame est constitué au moins d'un acier inoxydable austénitique et d'un alliage Fe-Ni dont la composition chimique comprend, en poids, de 27 % à 32 % de nickel.Device for hanging the shadow mask according to any one of Claims 1 to 3 characterized in that the bimetallic strip consists of at least one austenitic stainless steel and an Fe-Ni alloy whose chemical composition comprises, by weight, from 27% to 32% of nickel. Bilame caractérisé en ce que sa déflexion entre 60 °C et 130 °C est inférieure à sa déflexion entre 20 °C et 60 °C.Bimetal characterized in that its deflection between 60 ° C and 130 ° C is less than its deflection between 20 ° C and 60 ° C. Bilame selon la revendication 7 caractérisé en ce que il est constitué d'au moins un acier inoxydable austénitique et d'un alliage Fe-Ni dont la composition chimique comprend, en poids, de 27 % à 32 % de nickel.Bimetal according to claim 7 characterized in that it consists of at least minus an austenitic stainless steel and an Fe-Ni alloy whose composition chemical comprises, by weight, from 27% to 32% of nickel.
EP97402908A 1996-12-31 1997-12-03 Suspension device for a shadow maskof a display cathode ray tube using a bimetal Expired - Lifetime EP0851454B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9616253 1996-12-31
FR9616253A FR2758001A1 (en) 1996-12-31 1996-12-31 DEVICE FOR SUSPENDING THE SHADOW MASK OF A CATHODE VIEWING TUBE COMPRISING A BILAME AND BILAME

Publications (2)

Publication Number Publication Date
EP0851454A1 true EP0851454A1 (en) 1998-07-01
EP0851454B1 EP0851454B1 (en) 2003-02-12

Family

ID=9499332

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97402908A Expired - Lifetime EP0851454B1 (en) 1996-12-31 1997-12-03 Suspension device for a shadow maskof a display cathode ray tube using a bimetal

Country Status (13)

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US (1) US6118211A (en)
EP (1) EP0851454B1 (en)
JP (1) JPH10199431A (en)
KR (1) KR19980064281A (en)
AT (1) ATE232646T1 (en)
BR (1) BR9705616A (en)
DE (1) DE69719005D1 (en)
FR (1) FR2758001A1 (en)
ID (1) ID19289A (en)
LT (1) LT4454B (en)
PL (1) PL324076A1 (en)
RU (1) RU97121923A (en)
SG (1) SG68009A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2346812A1 (en) * 1976-04-01 1977-10-28 Rau Fa G HIGH-USE LIMIT BILAME AND PROCESS FOR MANUFACTURING IT
JPS57111933A (en) * 1980-12-27 1982-07-12 Toshiba Corp Color picture tube
EP0143707A1 (en) * 1983-11-25 1985-06-05 Videocolor Shadow mask for a colour picture tube, and tube provided with such a mask
US4792719A (en) * 1987-08-31 1988-12-20 Gte Products Corporation Edge-bonded bimetal compensator for shadow mask
US5502350A (en) * 1993-07-05 1996-03-26 Hitachi Metals Ltd. Shadow mask support member having high strength and thermal deformation resistant low-expansion alloy plate and high expansion alloy plate and method of producing the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781583A (en) * 1972-08-07 1973-12-25 Texas Instruments Inc Arrangement for a shadow mask in a slim color television tube and thermostat metal for use therein
JPH06322486A (en) * 1993-03-17 1994-11-22 Hitachi Metals Ltd Shadow mask supporting member and its production
FR2728724B1 (en) * 1994-12-27 1997-01-24 Imphy Sa METHOD FOR MANUFACTURING AN IRON-NICKEL ALLOY SHADOW MASK

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2346812A1 (en) * 1976-04-01 1977-10-28 Rau Fa G HIGH-USE LIMIT BILAME AND PROCESS FOR MANUFACTURING IT
JPS57111933A (en) * 1980-12-27 1982-07-12 Toshiba Corp Color picture tube
EP0143707A1 (en) * 1983-11-25 1985-06-05 Videocolor Shadow mask for a colour picture tube, and tube provided with such a mask
US4792719A (en) * 1987-08-31 1988-12-20 Gte Products Corporation Edge-bonded bimetal compensator for shadow mask
US5502350A (en) * 1993-07-05 1996-03-26 Hitachi Metals Ltd. Shadow mask support member having high strength and thermal deformation resistant low-expansion alloy plate and high expansion alloy plate and method of producing the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 205 (E - 136) 16 October 1982 (1982-10-16) *

Also Published As

Publication number Publication date
FR2758001A1 (en) 1998-07-03
ATE232646T1 (en) 2003-02-15
LT97203A (en) 1998-10-26
DE69719005D1 (en) 2003-03-20
ID19289A (en) 1998-07-02
EP0851454B1 (en) 2003-02-12
PL324076A1 (en) 1998-07-06
BR9705616A (en) 1999-06-15
LT4454B (en) 1999-01-25
SG68009A1 (en) 1999-10-19
KR19980064281A (en) 1998-10-07
JPH10199431A (en) 1998-07-31
US6118211A (en) 2000-09-12
RU97121923A (en) 1999-10-27

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