EP1063304A1 - Masking device for a colour flat screen cathode ray tube comprising a supporting frame for planar mask and planar mask - Google Patents

Masking device for a colour flat screen cathode ray tube comprising a supporting frame for planar mask and planar mask Download PDF

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Publication number
EP1063304A1
EP1063304A1 EP00401772A EP00401772A EP1063304A1 EP 1063304 A1 EP1063304 A1 EP 1063304A1 EP 00401772 A EP00401772 A EP 00401772A EP 00401772 A EP00401772 A EP 00401772A EP 1063304 A1 EP1063304 A1 EP 1063304A1
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EP
European Patent Office
Prior art keywords
alloy
shadow mask
hardened
support frame
type
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00401772A
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German (de)
French (fr)
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EP1063304B1 (en
Inventor
Ricardo Cozar
Pierre-Louis Reydet
Jean-Pierre Reyal
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Aperam Stainless Precision SAS
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Imphy Ugine Precision 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/001—Heat treatment of ferrous alloys containing Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • H01J2229/0722—Frame
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12639—Adjacent, identical composition, components
    • Y10T428/12646—Group VIII or IB metal-base
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12639—Adjacent, identical composition, components
    • Y10T428/12646—Group VIII or IB metal-base
    • Y10T428/12653—Fe, containing 0.01-1.7% carbon [i.e., steel]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12958—Next to Fe-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12958—Next to Fe-base component
    • Y10T428/12965—Both containing 0.01-1.7% carbon [i.e., steel]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
    • Y10T428/12979—Containing more than 10% nonferrous elements [e.g., high alloy, stainless]

Definitions

  • the present invention relates to a masking device for a tube cathode color display flat screen, of the type comprising a frame support for a stretched shadow mask and a stretched shadow mask mounted on the support frame.
  • Color display cathode ray tubes have, so known, a display screen provided with photophores, an electron gun producing 3 electron beams and a masking device, consisting of a shadow mask mounted on a support frame, placed opposite the screen of display and intended to ensure good quality of the image viewed.
  • the shadow mask consists of a metal sheet pierced with a plurality of holes or slits through which the 3 electron beams pass to excite the photophores arranged on the screen. The quality of the image obtained is all the more better than the alignment between the lanterns, the holes in the shadow mask and the electron beams are precise.
  • the shadow mask When the viewing tube is in functioning, a significant part of the electron beams is intercepted by the shadow mask, which generates local heating of it which can distort it and therefore deteriorate the quality of the displayed image.
  • the quality of the image may also be deteriorated by the vibrations of the shadow mask caused by various sources of vibration.
  • the shadow mask To obtain images of good quality, the shadow mask must on the one hand be not very sensitive to local heating, on the other hand, have a natural frequency of vibration high enough that the amplitude of these vibrations does not disturb the color of images by misalignment of electron beams, holes in the shadow mask and tealight holders.
  • the shadow mask When the viewing screen is curved, the shadow mask has a shape which matches that of the screen, and the problems of sensitivity to overheating and vibration are resolved by making the shadow mask by stamping a sheet of Fe-Ni alloy with a very low coefficient of expansion pierced with holes.
  • the shadow mask is simply welded to a support frame which exerts no effort on the shadow mask. The frame can therefore be light, which presents benefits.
  • the shadow mask can be a sheet not stamped fixed for example by welding on a support frame previously compressed which then exerts a tension on the shadow mask.
  • the shadow mask is then said to be "stretched".
  • the tension of the shadow mask is intended, on the one hand to solve the problem of sensitivity to local heating, and on the other hand to increase the natural frequency of vibration of the shadow mask for attenuate the amplitude of these vibrations.
  • This solution requires in particular the use of a material whose characteristics make it possible to maintain a tension sufficient in the operating temperature range of the cathode ray tube (approximately 100 ° C), and this after heating to approximately 500 ° C during the manufacture of the cathode ray tube.
  • the shadow mask is mounted taut on its support frame, then the assembly is placed in the cathode ray tube which is then sealed at a temperature of about 500 ° C for one hour. This heating can cause the shadow mask and its frame to creep which can relax the shadow mask.
  • the object of the present invention is to remedy these drawbacks by proposing a means for manufacturing a stretched shadow mask and its support frame not very sensitive to local heating, having a natural frequency of vibration suitable and well tolerating the temperature tube sealing operation high.
  • the subject of the invention is a masking device for a cathode ray tube for color display on a flat screen, of the type comprising a support frame for a stretched shadow mask and a stretched shadow mask mounted on the support frame. so as to be subjected to a voltage at room temperature.
  • the support frame for a stretched shadow mask is made of hardened Fe-Ni alloy having a coefficient of thermal expansion between 20 ° C and 150 ° C less than 5x10 -6 / K and an elastic limit Rp0.2 at 20 ° C greater than 700 MPa
  • the stretched shadow mask is made of Fe-Ni alloy having a coefficient of thermal expansion between 20 ° C and 150 ° C less than 5x10 -6 / K.
  • the hardened Fe-Ni alloy of which the support frame is made can be, for example, a Fe-Ni alloy with structural hardening of the “hardened y '” type, the chemical composition of which is such that (in% by weight): 40.5% ⁇ Ni + Co + Cu ⁇ 44.5% 0% ⁇ Co ⁇ 5% 0% ⁇ Cu ⁇ 3% 1.5% ⁇ Ti ⁇ 3.5% 0.05% ⁇ Al ⁇ 1% C ⁇ 0.05% If ⁇ 0.5% Mn ⁇ 0.5% S ⁇ 0.01% P ⁇ 0.02% the remainder being iron and impurities resulting from processing.
  • the hardened Fe-Ni alloy of which the support frame is made can also be a Fe-Ni alloy of the “hardened carbides” type having a chemical composition such as (in% by weight): 36% ⁇ Ni + Co + Cu ⁇ 40% 0% ⁇ Co ⁇ 5% 0% ⁇ Cu ⁇ 3% 1.6% ⁇ Mo ⁇ 2.8% 0.4% ⁇ Cr ⁇ 1.5% 0.15% ⁇ C ⁇ 0.35% If ⁇ 0.5% Mn ⁇ 0.5% S ⁇ 0.01% P ⁇ 0.02% the remainder being iron and impurities resulting from processing.
  • the hardened Fe-Ni alloy from which the support frame is made can also be a Fe-Ni alloy of the “hardened beryllium” type having a chemical composition such as (in% by weight): 34% ⁇ Ni + Co + Cu ⁇ 38% 0% ⁇ Co ⁇ 5% 0% ⁇ Cu ⁇ 3% 0.15% ⁇ Be ⁇ 1% C ⁇ 0.05% If ⁇ 0.5% Mn ⁇ 1% S ⁇ 0.01% P ⁇ 0.02% the remainder being iron and impurities resulting from processing.
  • the hardened Fe-Ni alloy of which the support frame is made can also be a Fe-Ni alloy of the “hardened by solid solution” type having a chemical composition such as (in% by weight): 38% ⁇ Ni + Co + Cu ⁇ 42% 0% ⁇ Co ⁇ 5% 0% ⁇ Cu ⁇ 3% 1% ⁇ Nb ⁇ 4% C ⁇ 0.05% If ⁇ 0.5% Mn ⁇ 0.5% S ⁇ 0.01% P ⁇ 0.02% the remainder being iron and impurities resulting from processing.
  • the shadow mask is made of Fe-Ni alloy whose coefficient of thermal expansion between 20 ° C and 150 ° C is less than 2x10 -6 / K and whose chemical composition can include, (in% by weight): 32% ⁇ Ni ⁇ 37% 0% ⁇ Co ⁇ 5.5% 0% ⁇ Mn ⁇ 0.5% If ⁇ 0.2% C ⁇ 0.02% S ⁇ 0.01% P ⁇ 0.02% the remainder being iron and impurities resulting from processing.
  • the tension of the shadow mask is then preferably less than 120 MPa.
  • the shadow mask can also be made of hardened Fe-Ni alloy of the “hardened” type. ⁇ '”, of the“ hardened carbides ”type, of the“ hardened beryllium ”type or of the“ hardened by solid solution ", as defined above.
  • the tension of the shadow mask can then be greater than 150 MPa.
  • the invention also relates to a method for manufacturing the frame.
  • a strip of Fe-Ni alloy is used "Hardened ⁇ '" annealed or annealed and work hardened then tensioned, with which one realizes a frame blank by cutting, folding and welding, then subjecting the blank frame to a heat treatment hardening at a temperature between 600 ° C and 800 ° C for a time between 30 minutes and 2 hours.
  • the invention also relates to a method for manufacturing the support frame shadow mask of a masking device for cathode-ray display tube in color with flat screen, the shadow mask support frame is made of Fe-Ni alloy "Hardened carbides".
  • the mask support frame is made shade by cutting, folding and welding a strip of "hardened” Fe-Ni alloy carbides ", obtained by cold rolling with a degree of wrought greater than 50%, and by a hardening heat treatment at a temperature included between 650 ° C and 850 ° C for 1 minute to 2 hours, possibly followed by additional cold rolling with a wrought rate of less than 70% and a stress relieving heat treatment at a temperature between 400 ° C and 600 ° C.
  • the Fe-Ni alloy is of the “hardened beryllium” type
  • cold rolling is performed with a rate of wrought between 20% and 80%, and the treatment of hardening is a hold between 400 ° C and 700 ° C for a time between 1 minute 8 hours.
  • the Fe-Ni alloy is of the “solid solution hardened” type
  • rolling to cold is carried out with a degree of wrought between 20% and 70%
  • the heat treatment is a stress relief corresponding to a maintenance between 400 ° C and 600 ° C.
  • the frame can be manufactured by assembling tubes of square, triangular or round.
  • the hardening heat treatment is carried out either before mounting the frame, either after.
  • the masking device for a color display cathode ray tube flat screen shown in Figure 1 includes a shadow mask 1 consisting of a sheet pierced with a plurality of holes 2, and a support frame 3 comprising lateral uprights 4 (only one visible in the figure) and end uprights 5 and 5 '.
  • the shadow mask 1 is fixed for example by welding to the upper edges 6 and 6 'of the end posts 5 and 5'.
  • the support frame 3 is subjected to compression forces (small arrows in Figure 1) intended to generate an elastic deformation which reduces the distance between the 5 and 5 'end posts, and the shadow mask is subjected to tensile forces (large arrows in Figure 1) intended to generate an elastic elongation deformation.
  • compression forces small arrows in Figure 1
  • tensile forces large arrows in Figure 1
  • the shadow mask is then fixed by welding to the support frame and the compression and tensile forces are deleted.
  • elastic deformations of the support frame and the shadow mask remain, so that the shadow mask remains subject to voltage.
  • the device consisting of the support frame and the shadow mask is then mounted in the cathode ray tube and it is sealed at a temperature close to 500 ° C for about 1 hour. Heating in the vicinity of 500 ° C generates a expansion of the support frame and shadow mask which can either increase the shade mask tension if the support frame expands more than the mask shade, either maintain the tension if the dilations are identical, or reduce the tension if the support frame expands less than the shadow mask. When the tension remains significant, it generates a deformation by creep of the frame support (reduction in length) and shadow mask (increase in length). After returning to ambient temperature, these creep deformations are superimposed at the initial elastic deformations, so that the tension of the shadow mask is scaled down.
  • the tension residual of the shadow mask is sufficient for the natural frequency of vibration of the shadow mask is satisfactory, and to induce at any point a elastic deformation which makes it possible to absorb the expansions resulting from local heating and thus prevent the shadow mask from being deformed under the effect of these local warm-ups.
  • the shadow mask consists of an Fe-Ni alloy whose coefficient of thermal expansion between 20 ° C and 150 ° C is less than 2x10 -6 / K
  • the support frame is made of hardened Fe-Ni alloy having a coefficient of thermal expansion between 20 ° C and 150 ° C less than 5x10 -6 / K, an elastic limit Rp0,2 at 20 ° C greater than 700 MPa and an elongation by creep at 500 ° C less than 0.01% under a stress of 300MPa.
  • the alloy of which the shadow mask is made has a chemical composition which comprises, by weight: 32% ⁇ Ni ⁇ 37% 0% ⁇ Co ⁇ 5.5% 0% ⁇ Mn ⁇ 0.5% If ⁇ 0.2% C ⁇ 0.02% S ⁇ 0.01% P ⁇ 0.02% the remainder being iron and impurities resulting from processing.
  • This alloy is, for example, an alloy containing from 35% to 37% of nickel, less than 0.4%, or better still less than 0.1%, of manganese and no cobalt, or well an alloy containing from 32% to 34% of nickel, 3.5% to 5.5% of cobalt and less 0.1% manganese.
  • This alloy can be used in the annealed state above 750 ° C. after rolling. cold to have a yield strength between 260 MPa and 300 MPa and a creep elongation at 500 ° C less than 0.02% under a stress of 50 MPa.
  • the tension of the shadow mask should preferably not generate in the engraved area of the shadow mask, a stress greater than 60 MPa, this which, given the low coefficient of expansion, is sufficient to minimize the effects of local heating.
  • the alloy can also be used in the hardened state, or better, hardened and relaxed; in the latter case, in particular, the tension of the shadow mask can reach 120MPa. Such tension can improve behavior vibration of the shadow mask.
  • the hardened Fe-Ni alloy from which the support frame is made is, for example, either an alloy of the “hardened ⁇ '” type, either an alloy of the “hardened carbides” type, or of the type “Hardened beryllium”, or of the type "hardened by solid solution”.
  • the chemical composition of an alloy of the “hardened ⁇ '” type includes, for example, in% by weight: 40.5% ⁇ Ni + Co + Cu ⁇ 44.5% 0% ⁇ Co ⁇ 5% 0% ⁇ Cu ⁇ 3% 1.5% ⁇ Ti ⁇ 3.5% 0.05% ⁇ Al ⁇ 1% C ⁇ 0.05% If ⁇ 0.5% Mn ⁇ 0.5% S ⁇ 0.01% P ⁇ 0.02% the remainder being iron and impurities resulting from processing.
  • the nickel content is chosen to obtain a coefficient of expansion satisfactory thermal.
  • Part of the nickel can be substituted by cobalt or by copper, so these elements are given on an optional basis and their contents can be zero.
  • Titanium and aluminum make it possible to obtain a structural hardening by homogeneous and coherent precipitation of the ⁇ 'Ni 3 (Ti, Al) phase.
  • the mask support frame shade is made from a strip of thickness between, for example, between 0.5 mm and 3 mm, obtained by cold rolling and annealing at a temperature included, preferably between 900 ° C and 1100 ° C. After annealing, the strip can optionally undergo additional cold rolling with a rate of wrought less than 30%, followed by relaxation in the parade fast enough to evacuate the precipitation of the ⁇ 'phase at a temperature between 400 ° C and 600 ° C.
  • the shadow mask support frame cut from the strip of parts which are shaped, for example by folding, and assembled or fixed by welding, screwing, clinching, or by any other means, so to obtain a draft support frame.
  • the draft support frame is then subjected to a precipitation hardening heat treatment consisting of maintaining at a temperature between 600 ° C and 800 ° C for a time between 30 minutes and 2 hours.
  • the frame can also be manufactured by cutting, shaping and assembly of a strip previously hardened and hardened by heat treatment parade between 700 ° C and 850 ° C for 1 to 15 minutes, or by heat treatment static between 600 ° C and 800 ° C for a time between 30 minutes and 2 hours.
  • the heat treatment is carried out on a strip directly from cold rolling.
  • an alloy of the “hardened ⁇ '” type the chemical composition of which comprises (in% by weight): Or Co Cu Ti Al VS Yes Mn S P Fe 42.4 0.02 0.01 2.57 0.18 0.01 0.03 0.10 0.002 0.005 Ball. after hardening treatment at 700 ° C for 1 hour, carried out on an annealed strip at 960 ° C for 30 minutes after cold rolling, the following mechanical characteristics are obtained: yield strength Rp0,2 860 MPa tensile strength Rm 1156 MPa uniform elongation Au 13.8% total elongation At 17.1% The coefficient of thermal expansion of this alloy is 3.4x10 -6 / K between 20 ° C and 150 ° C.
  • the chemical composition of an alloy of the “hardened carbides” type comprises, for example, in% by weight: 36% ⁇ Ni + Co + Cu ⁇ 40% 0% ⁇ Co ⁇ 5% 0% ⁇ Cu ⁇ 3% 1.6% ⁇ Mo ⁇ 2.8% 0.4% ⁇ Cr ⁇ 1.5% 0.15% ⁇ C ⁇ 0.35% If ⁇ 0.5% Mn ⁇ 0.5% S ⁇ 0.01% P ⁇ 0.02% the remainder being iron and impurities resulting from processing.
  • the nickel content is chosen to obtain a coefficient of thermal expansion between 20 ° C and 150 ° C less than 5x10 -6 / K.
  • Nickel can be partially replaced by cobalt or copper, so these are optional.
  • Molybdenum, chromium and carbon allow the formation of carbides which harden the structure.
  • the support frame is produced by cutting, folding and assembly by welding, clinching, screwing or any other means, of a strip obtained by cold rolling with a degree of wrought between 60% and 80%, followed by a hardening heat treatment which can be carried out at the parade for 1 to 15 minutes between 750 ° C and 850 ° C, or static for 15 minutes at 2 hours, between 650 ° C and 750 ° C. Possibly, after the heat treatment of hardening, the strip can undergo additional cold rolling with a rate of wrinkling less than 70% followed by a stress relieving treatment between 400 ° C and 600 ° C, for 30 seconds to 5 minutes.
  • the strip thus obtained has a yield strength greater than 700MPa and an elongation at break greater than 5% sufficient to allow shaping by folding.
  • the chemical composition of an alloy of the “hardened beryllium” type includes, for example, in% by weight: 34% ⁇ Ni + Co + Cu ⁇ 38% 0% ⁇ Co ⁇ 5% 0% ⁇ Cu ⁇ 3% 0.15% ⁇ Be ⁇ 1% C ⁇ 0.05% If ⁇ 0.5% Mn ⁇ 1% S ⁇ 0.01% S ⁇ 0.01% P ⁇ 0.02% the remainder being iron and impurities resulting from processing.
  • the support frame is produced by cutting, folding and assembly by welding, clinching, screwing or any other means, of a strip obtained by cold rolling with a degree of wrought between 20% and 80%, followed by a hardening heat treatment consisting of holding between 400 ° C and 700 ° C for 1 minute to 8 hours.
  • the chemical composition of an alloy of the “hardened by solid solution” type includes, for example, in% by weight: 38% ⁇ Ni + Co + Cu ⁇ 42% 0% ⁇ Co ⁇ 5% 0% ⁇ Cu ⁇ 3% 1% ⁇ Nb ⁇ 4% C ⁇ 0.05% If ⁇ 0.5% Mn ⁇ 0.5% S ⁇ 0.01% P ⁇ 0.02% the remainder being iron and impurities resulting from processing.
  • the support frame is produced by cutting, folding and assembly by welding, clinching, screwing or any other means, of a strip obtained by cold rolling with a degree of wrought between 20% and 70%, followed by a stress relieving treatment consisting of maintaining between 400 ° C and 600 ° C.
  • alloys with a low coefficient of expansion makes it possible to obtain a good compatibility between the shadow mask and its support frame, in particular avoid too great a variation in the shade mask tension when the temperature varies, due to differential expansions.
  • the elastic limit Rp0,2 at 20 ° C higher than 700 MPa and the very good resistance to creep at 500 ° C makes it possible to manufacture a light frame since the the constraints to which its elements are subjected can be high.
  • the lightness of the support frame promotes low sensitivity of the masking device temperature variations.
  • the good creep resistance of the alloys of which the mask is made shade and the support frame allows to keep a tension of the shadow mask satisfactory after heating in the vicinity of 500 ° C intended to seal the slab screen on the glass cone of the cathode ray tube, all the more so as the voltage sought for the shadow mask is not too high.
  • curve 12 in FIG. 2 relating to a steel weakly alloyed, shows that the expansion differential between this steel and the Fe-Ni alloy with low coefficient of expansion is such that if the support frame were constituted steel and the shadow mask of Fe-Ni alloy with low coefficient of expansion, in the absence of suitable compensation means, the heating carried out at the time of sealing the cathode ray tube would lead to the rupture of the shadow mask.
  • the support frame is produced, as in the first embodiment, of hardened Fe-Ni alloy, for example of the type “Hardened ⁇ '", of the type “hardened carbides”, of the type “hardened beryllium” or of the type “hardened by solid solution ".
  • the shadow mask itself is also made up a hardened Fe-Ni alloy, for example of the “hardened ⁇ '” type, of the “hardened carbides” type, of the “hardened beryllium” type or of the “hardened by solid solution” type as described above.
  • the hardening treatment is carried out before etching shadow mask chemical.
  • the shadow mask is then mounted on the frame support with a tension which can be higher than 150MPa, even higher than 200MPa (but this tension must remain lower than 300MPa), which allows to increase the natural frequency of vibration or to reduce the thickness of the mask shade.
  • tension of the shadow mask is made possible by the tensile and creep resistance characteristics of the hardening alloy which are significantly higher than those of the annealed Fe-Ni alloy used in the first embodiment.

Abstract

A device for masking a flat screen color monitor has a mask mounted within and tensioned at ambient temperature by a support. The support is an iron nickel alloy with a thermal expansion coefficient ≤ 5 x 10<-6>/K between 20 - 150 degrees C and an elastic limit Rp0.2 at 20 degrees C ≥ 700 MPa. Independent claims are included for the following: (a) Methods of manufacturing the above device including hardening of the screen at 400 - 800 degrees C. (b) Methods of manufacturing the above device including de-tensioning the screen at 400 - 600 degrees C.

Description

La présente invention concerne un dispositif de masquage pour tube cathodique de visualisation en couleur à écran plat, du type comprenant un cadre support pour masque d'ombre tendu et un masque d'ombre tendu monté sur le cadre support.The present invention relates to a masking device for a tube cathode color display flat screen, of the type comprising a frame support for a stretched shadow mask and a stretched shadow mask mounted on the support frame.

Les tubes cathodiques de visualisation en couleur comportent, de façon connue, un écran de visualisation muni de photophores, un canon à électrons produisant 3 faisceaux d'électrons et un dispositif de masquage, constitué d'un masque d'ombre monté sur un cadre support, disposé en regard de l'écran de visualisation et destiné à assurer une bonne qualité de l'image visualisée. Le masque d'ombre est constitué d'une feuille métallique percée d'une pluralité de trous ou de fentes à travers lesquels les 3 faisceaux d'électrons passent pour aller exciter les photophores disposés sur l'écran. La qualité de l'image obtenue est d'autant meilleure que l'alignement entre les photophores, les trous du masque d'ombre et les faisceaux d'électrons est précis. Lorsque le tube de visualisation est en fonctionnement, une partie significative des faisceaux d'électrons est interceptée par le masque d'ombre, ce qui engendre des échauffements locaux de celui-ci pouvant le déformer et donc détériorer la qualité de l'image visualisée. De plus, la qualité de l'image peut également être détériorée par les vibrations du masque d'ombre provoquées par des sources de vibration diverses. Pour obtenir des images de bonne qualité, le masque d'ombre doit d'une part, être peu sensible aux échauffements locaux, d'autre part, avoir une fréquence propre de vibration suffisamment élevée pour que l'amplitude de ces vibrations ne perturbe pas la couleur des images par un désalignement des faisceaux d'électrons, des trous du masque d'ombre et des photophores.Color display cathode ray tubes have, so known, a display screen provided with photophores, an electron gun producing 3 electron beams and a masking device, consisting of a shadow mask mounted on a support frame, placed opposite the screen of display and intended to ensure good quality of the image viewed. The shadow mask consists of a metal sheet pierced with a plurality of holes or slits through which the 3 electron beams pass to excite the photophores arranged on the screen. The quality of the image obtained is all the more better than the alignment between the lanterns, the holes in the shadow mask and the electron beams are precise. When the viewing tube is in functioning, a significant part of the electron beams is intercepted by the shadow mask, which generates local heating of it which can distort it and therefore deteriorate the quality of the displayed image. In addition, the quality of the image may also be deteriorated by the vibrations of the shadow mask caused by various sources of vibration. To obtain images of good quality, the shadow mask must on the one hand be not very sensitive to local heating, on the other hand, have a natural frequency of vibration high enough that the amplitude of these vibrations does not disturb the color of images by misalignment of electron beams, holes in the shadow mask and tealight holders.

Lorsque l'écran de visualisation est bombé, le masque d'ombre a une forme qui épouse celle de l'écran, et les problèmes de sensibilité aux échauffements locaux et de vibration sont résolus en réalisant le masque d'ombre par emboutissage d'une feuille en alliage Fe-Ni à très faible coefficient de dilatation percée de trous. Le masque d'ombre est simplement soudé sur un cadre support qui n'exerce aucun effort sur le masque d'ombre. Le cadre peut donc être léger, ce qui présente des avantages.When the viewing screen is curved, the shadow mask has a shape which matches that of the screen, and the problems of sensitivity to overheating and vibration are resolved by making the shadow mask by stamping a sheet of Fe-Ni alloy with a very low coefficient of expansion pierced with holes. The shadow mask is simply welded to a support frame which exerts no effort on the shadow mask. The frame can therefore be light, which presents benefits.

Lorsque l'écran de visualisation est plat, le masque d'ombre peut être une feuille non emboutie fixée par exemple par soudage sur un cadre support préalablement comprimé qui exerce ensuite une tension sur le masque d'ombre. Le masque d'ombre est alors dit « tendu ». La tension du masque d'ombre est destinée, d'une part à résoudre le problème de la sensibilité aux échauffements locaux, et d'autre part à augmenter la fréquence propre de vibration du masque d'ombre pour atténuer l'amplitude de ces vibrations. Cette solution suppose notamment l'utilisation d'un matériau dont les caractéristiques permettent de maintenir une tension suffisante dans le domaine de température de fonctionnement du tube cathodique (approximativement 100°C), et cela après un chauffage à environ 500°C pendant la fabrication du tube cathodique. En effet, le masque d'ombre est monté tendu sur son cadre support, puis l'ensemble est disposé dans le tube cathodique qui est alors scellé à une température d'environ 500°C pendant une heure. Ce chauffage peut provoquer un fluage du masque d'ombre et de son cadre qui peut détendre le masque d'ombre.When the display screen is flat, the shadow mask can be a sheet not stamped fixed for example by welding on a support frame previously compressed which then exerts a tension on the shadow mask. The shadow mask is then said to be "stretched". The tension of the shadow mask is intended, on the one hand to solve the problem of sensitivity to local heating, and on the other hand to increase the natural frequency of vibration of the shadow mask for attenuate the amplitude of these vibrations. This solution requires in particular the use of a material whose characteristics make it possible to maintain a tension sufficient in the operating temperature range of the cathode ray tube (approximately 100 ° C), and this after heating to approximately 500 ° C during the manufacture of the cathode ray tube. Indeed, the shadow mask is mounted taut on its support frame, then the assembly is placed in the cathode ray tube which is then sealed at a temperature of about 500 ° C for one hour. This heating can cause the shadow mask and its frame to creep which can relax the shadow mask.

Pour fabriquer un masque d'ombre tendu et son cadre support, on a proposé d'utiliser un acier faiblement allié (c'est-à-dire, contenant, en général, moins de 5% d'éléments d'alliage). Mais, le coefficient de dilatation thermique de cet acier étant élevé, la tension du masque d'ombre doit être supérieure à 200 MPa pour éviter les déformations dues aux échauffements locaux. Cette solution conduit à un cadre lourd, dont le poids peut atteindre, voire dépasser, 6 kg.To make a stretched shadow mask and its support frame, we proposed using low alloy steel (i.e. containing, in general, less than 5% alloying elements). However, the coefficient of thermal expansion of this steel being high, the shade mask tension must be higher than 200 MPa to avoid deformations due to local heating. This solution leads to a framework heavy, weighing 6 kg or more.

Pour fabriquer un masque d'ombre tendu et son cadre support, on a également proposé de réaliser le masque d'ombre en alliage Fe-Ni à faible coefficient de dilatation et le cadre en acier. Mais, il est alors nécessaire de prévoir des moyens pour éviter de provoquer des surtensions du masque d'ombre pendant le scellement du tube à 500°C, faute de quoi, le masque d'ombre se déchire pendant cette opération.To make a stretched shadow mask and its support frame, we have also proposed to make the shadow mask in low-Fe-Ni alloy coefficient of expansion and the steel frame. But, it is then necessary to plan means to avoid causing overvoltage of the shadow mask during sealing the tube at 500 ° C, otherwise the shadow mask tears during this operation.

Le but de la présente invention est de remédier à ces inconvénients en proposant un moyen pour fabriquer un masque d'ombre tendu et son cadre support peu sensibles aux échauffements locaux, ayant une fréquence propre de vibration convenable et supportant bien l'opération de scellement du tube à température élevée. The object of the present invention is to remedy these drawbacks by proposing a means for manufacturing a stretched shadow mask and its support frame not very sensitive to local heating, having a natural frequency of vibration suitable and well tolerating the temperature tube sealing operation high.

A cet effet, l'invention a pour objet un dispositif de masquage pour tube cathodique de visualisation en couleur à écran plat, du type comprenant un cadre support pour masque d'ombre tendu et un masque d'ombre tendu monté sur le cadre support de façon à être soumis à une tension à la température ambiante. Le cadre support pour masque d'ombre tendu est en alliage Fe-Ni durci ayant un coefficient de dilatation thermique entre 20°C et 150°C inférieur à 5x10-6/K et une limite d'élasticité Rp0,2 à 20°C supérieure à 700 MPa, et le masque d'ombre tendu est en alliage Fe-Ni ayant un coefficient de dilatation thermique entre 20°C et 150°C inférieur à 5x10-6/K.To this end, the subject of the invention is a masking device for a cathode ray tube for color display on a flat screen, of the type comprising a support frame for a stretched shadow mask and a stretched shadow mask mounted on the support frame. so as to be subjected to a voltage at room temperature. The support frame for a stretched shadow mask is made of hardened Fe-Ni alloy having a coefficient of thermal expansion between 20 ° C and 150 ° C less than 5x10 -6 / K and an elastic limit Rp0.2 at 20 ° C greater than 700 MPa, and the stretched shadow mask is made of Fe-Ni alloy having a coefficient of thermal expansion between 20 ° C and 150 ° C less than 5x10 -6 / K.

L'alliage Fe-Ni durci dont est constitué le cadre support peut être, par exemple, un alliage Fe-Ni à durcissement structural du type « durci y'» dont la composition chimique est telle que (en % en poids) : 40,5% ≤ Ni + Co + Cu ≤ 44,5% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1,5% ≤ Ti ≤ 3,5% 0,05% ≤Al ≤ 1% C ≤ 0,05% Si ≤ 0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.The hardened Fe-Ni alloy of which the support frame is made can be, for example, a Fe-Ni alloy with structural hardening of the “hardened y '” type, the chemical composition of which is such that (in% by weight): 40.5% ≤ Ni + Co + Cu ≤ 44.5% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1.5% ≤ Ti ≤ 3.5% 0.05% ≤Al ≤ 1% C ≤ 0.05% If ≤ 0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing.

L'alliage Fe-Ni durci dont est constitué le cadre support peut également être un alliage Fe-Ni du type « durci carbures » ayant une composition chimique telle que (en % en poids) : 36% ≤ Ni + Co +Cu ≤ 40% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1,6% ≤ Mo ≤ 2,8% 0,4% ≤ Cr ≤ 1,5% 0,15% ≤ C ≤ 0,35% Si ≤ 0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.The hardened Fe-Ni alloy of which the support frame is made can also be a Fe-Ni alloy of the “hardened carbides” type having a chemical composition such as (in% by weight): 36% ≤ Ni + Co + Cu ≤ 40% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1.6% ≤ Mo ≤ 2.8% 0.4% ≤ Cr ≤ 1.5% 0.15% ≤ C ≤ 0.35% If ≤ 0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing.

L'alliage Fe-Ni durci dont est constitué le cadre support peut également être un alliage Fe-Ni du type « durci béryllium » ayant une composition chimique telle que (en % en poids) : 34% ≤ Ni + Co +Cu ≤ 38% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 0,15% ≤ Be ≤ 1% C ≤ 0,05% Si ≤ 0,5% Mn ≤ 1% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.The hardened Fe-Ni alloy from which the support frame is made can also be a Fe-Ni alloy of the “hardened beryllium” type having a chemical composition such as (in% by weight): 34% ≤ Ni + Co + Cu ≤ 38% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 0.15% ≤ Be ≤ 1% C ≤ 0.05% If ≤ 0.5% Mn ≤ 1% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing.

L'alliage Fe-Ni durci dont est constitué le cadre support peut également être un alliage Fe-Ni du type « durci par solution solide » ayant une composition chimique telle que (en % en poids) : 38% ≤ Ni + Co + Cu ≤ 42% 0% ≤ Co ≤ 5% 0%≤ Cu≤3% 1% ≤ Nb ≤ 4% C ≤ 0,05% Si ≤ 0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.The hardened Fe-Ni alloy of which the support frame is made can also be a Fe-Ni alloy of the “hardened by solid solution” type having a chemical composition such as (in% by weight): 38% ≤ Ni + Co + Cu ≤ 42% 0% ≤ Co ≤ 5% 0% ≤ Cu≤3% 1% ≤ Nb ≤ 4% C ≤ 0.05% If ≤ 0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing.

De préférence, le masque d'ombre est en alliage Fe-Ni dont le coefficient de dilatation thermique entre 20°C et 150°C est inférieur à 2x10-6/K et dont la composition chimique peut comprendre, (en % poids) : 32% ≤ Ni ≤ 37% 0% ≤ Co ≤ 5,5% 0% ≤ Mn ≤ 0,5% Si ≤ 0,2% C ≤ 0,02% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration. La tension du masque d'ombre est alors, de préférence, inférieure à 120 MPa.Preferably, the shadow mask is made of Fe-Ni alloy whose coefficient of thermal expansion between 20 ° C and 150 ° C is less than 2x10 -6 / K and whose chemical composition can include, (in% by weight): 32% ≤ Ni ≤ 37% 0% ≤ Co ≤ 5.5% 0% ≤ Mn ≤ 0.5% If ≤ 0.2% C ≤ 0.02% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing. The tension of the shadow mask is then preferably less than 120 MPa.

Le masque d'ombre peut également être en alliage Fe-Ni durci du type « durci γ' », du type «durci carbures », du type « durci béryllium » ou du type « durci par solution solide », tels que définis ci dessus. La tension du masque d'ombre peut alors être supérieure à 150 MPa.The shadow mask can also be made of hardened Fe-Ni alloy of the “hardened” type. γ '”, of the“ hardened carbides ”type, of the“ hardened beryllium ”type or of the“ hardened by solid solution ", as defined above. The tension of the shadow mask can then be greater than 150 MPa.

L'invention concerne également un procédé pour la fabrication du cadre support de masque d'ombre d'un dispositif de masquage pour tube cathodique de visualisation en couleur à écran plat dont le cadre support de masque d'ombre est en alliage Fe-Ni « durci γ' ». Selon ce procédé, on utilise une bande en alliage Fe-Ni « durci γ' » recuite ou recuite et écrouie puis détensionnée, avec laquelle on réalise une ébauche de cadre par découpage, pliage et soudage, puis on soumet l'ébauche de cadre à un traitement thermique de durcissement à une température comprise entre 600°C et 800°C pendant un temps compris entre 30 minutes et 2 heures.The invention also relates to a method for manufacturing the frame. shadow mask support of a masking device for cathode ray tube color display on a flat screen whose shadow mask support frame is made of Fe-Ni alloy "hardened γ '". According to this process, a strip of Fe-Ni alloy is used "Hardened γ '" annealed or annealed and work hardened then tensioned, with which one realizes a frame blank by cutting, folding and welding, then subjecting the blank frame to a heat treatment hardening at a temperature between 600 ° C and 800 ° C for a time between 30 minutes and 2 hours.

L'invention concerne aussi un procédé pour la fabrication du cadre support de masque d'ombre d'un dispositif de masquage pour tube cathodique de visualisation en couleur à écran plat dont le cadre support de masque d'ombre est en alliage Fe-Ni « durci carbures ». Selon ce procédé, on fabrique le cadre support de masque d'ombre par découpage, pliage et soudage d'une bande en alliage Fe-Ni « durci carbures », obtenue par laminage à froid avec un taux de corroyage supérieur à 50%, et par un traitement thermique de durcissement à une température comprise entre 650°C et 850°C pendant 1 minute à 2 heures, éventuellement suivi d'un laminage à froid complémentaire avec un taux de corroyage inférieur à 70% et d'un traitement thermique de détensionnement à un température comprise entre 400°C et 600°C.The invention also relates to a method for manufacturing the support frame shadow mask of a masking device for cathode-ray display tube in color with flat screen, the shadow mask support frame is made of Fe-Ni alloy "Hardened carbides". According to this process, the mask support frame is made shade by cutting, folding and welding a strip of "hardened" Fe-Ni alloy carbides ", obtained by cold rolling with a degree of wrought greater than 50%, and by a hardening heat treatment at a temperature included between 650 ° C and 850 ° C for 1 minute to 2 hours, possibly followed by additional cold rolling with a wrought rate of less than 70% and a stress relieving heat treatment at a temperature between 400 ° C and 600 ° C.

Lorsque l'alliage Fe-Ni est du type « durci béryllium », le laminage à froid est effectué avec un taux de corroyage compris entre 20% et 80%, et le traitement de durcissement est un maintien entre 400°C et 700°C pendant un temps compris entre 1 minute 8 heures.When the Fe-Ni alloy is of the “hardened beryllium” type, cold rolling is performed with a rate of wrought between 20% and 80%, and the treatment of hardening is a hold between 400 ° C and 700 ° C for a time between 1 minute 8 hours.

Lorsque l'alliage Fe-Ni est du type « durci par solution solide », le laminage à froid est effectué avec un taux de corroyage compris entre 20% et 70%, et le traitement thermique est un détensionnement correspondant à un maintien entre 400°C et 600°C.When the Fe-Ni alloy is of the “solid solution hardened” type, rolling to cold is carried out with a degree of wrought between 20% and 70%, and the heat treatment is a stress relief corresponding to a maintenance between 400 ° C and 600 ° C.

A noter que, au lieu d'être réalisé par découpage et pliage d'une bande, le cadre peut être fabriqué par assemblage de tubes de section carrée, triangulaire ou ronde. Le traitement thermique de durcissement est effectué soit avant montage du cadre, soit après.Note that, instead of being produced by cutting and folding a strip, the frame can be manufactured by assembling tubes of square, triangular or round. The hardening heat treatment is carried out either before mounting the frame, either after.

L'invention va maintenant être décrite plus en détails et illustrée par des exemples, mais de façon non limitative, en regard des figures annexées dans lesquelles :

  • la figure 1 représente en perspective, de façon schématique, un dispositif de masquage pour tube cathodique de visualisation en couleur à écran plat,
  • la figure 2 représente des courbes de dilatation entre 20°C et 600°C d'alliages Fe-Ni et d'acier.
The invention will now be described in more detail and illustrated by examples, but not limited to, with reference to the appended figures in which:
  • FIG. 1 shows in perspective, schematically, a masking device for a cathode ray tube for color display on a flat screen,
  • Figure 2 shows expansion curves between 20 ° C and 600 ° C of Fe-Ni alloys and steel.

Le dispositif de masquage pour tube cathodique de visualisation en couleur à écran plat représenté à la figure 1 comprend un masque d'ombre 1 constitué d'une feuille percée d'une pluralité de trous 2, et un cadre support 3 comportant des montants latéraux 4 (un seul visible sur la figure) et des montants d'extrémité 5 et 5'. Le masque d'ombre 1 est fixé par exemple par soudage sur les arêtes supérieures 6 et 6' des montants d'extrémité 5 et 5'.The masking device for a color display cathode ray tube flat screen shown in Figure 1 includes a shadow mask 1 consisting of a sheet pierced with a plurality of holes 2, and a support frame 3 comprising lateral uprights 4 (only one visible in the figure) and end uprights 5 and 5 '. The shadow mask 1 is fixed for example by welding to the upper edges 6 and 6 'of the end posts 5 and 5'.

Lors du montage, le cadre support 3 est soumis à des efforts de compression (petites flèches sur la figure 1) destinés à engendrer une déformation élastique qui réduit l'écartement des montants d'extrémité 5 et 5', et le masque d'ombre est soumis à des efforts de traction (grosses flèches sur la figure 1) destinés à engendrer une déformation élastique d'allongement. Le masque d'ombre est alors fixé par soudage sur le cadre support et les efforts de compression et de traction sont supprimés. Cependant, des déformations élastiques du cadre support et du masque d'ombre subsistent, si bien que le masque d'ombre reste soumis à une tension.During assembly, the support frame 3 is subjected to compression forces (small arrows in Figure 1) intended to generate an elastic deformation which reduces the distance between the 5 and 5 'end posts, and the shadow mask is subjected to tensile forces (large arrows in Figure 1) intended to generate an elastic elongation deformation. The shadow mask is then fixed by welding to the support frame and the compression and tensile forces are deleted. However, elastic deformations of the support frame and the shadow mask remain, so that the shadow mask remains subject to voltage.

Le dispositif constitué du cadre support et du masque d'ombre est alors monté dans le tube cathodique et celui-ci est scellé à une température voisine de 500°C pendant environ 1 heure. Le chauffage au voisinage de 500°C engendre une dilatation du cadre support et du masque d'ombre qui peuvent soit augmenter la tension du masque d'ombre si le cadre support se dilate plus que le masque d'ombre, soit maintenir la tension si les dilatations sont identiques, soit réduire la tension si le cadre support se dilate moins que le masque d'ombre. Lorsque la tension reste significative, elle engendre une déformation par fluage du cadre support (réduction de longueur) et du masque d'ombre (augmentation de longueur). Après retour à la température ambiante, ces déformations par fluage se superposent aux déformations élastiques initiales, si bien que la tension du masque d'ombre est réduite.The device consisting of the support frame and the shadow mask is then mounted in the cathode ray tube and it is sealed at a temperature close to 500 ° C for about 1 hour. Heating in the vicinity of 500 ° C generates a expansion of the support frame and shadow mask which can either increase the shade mask tension if the support frame expands more than the mask shade, either maintain the tension if the dilations are identical, or reduce the tension if the support frame expands less than the shadow mask. When the tension remains significant, it generates a deformation by creep of the frame support (reduction in length) and shadow mask (increase in length). After returning to ambient temperature, these creep deformations are superimposed at the initial elastic deformations, so that the tension of the shadow mask is scaled down.

Lorsque les déformations par fluage sont suffisamment faibles, la tension résiduelle du masque d'ombre est suffisante pour que la fréquence propre de vibration du masque d'ombre soit satisfaisante, et pour induire en tout point une déformation élastique qui permet d'absorber les dilatations résultant des échauffements locaux et ainsi, éviter que le masque d'ombre soit déformé sous l'effet de ces échauffements locaux.When the creep strains are sufficiently small, the tension residual of the shadow mask is sufficient for the natural frequency of vibration of the shadow mask is satisfactory, and to induce at any point a elastic deformation which makes it possible to absorb the expansions resulting from local heating and thus prevent the shadow mask from being deformed under the effect of these local warm-ups.

Dans un premier mode de réalisation, le masque d'ombre est constitué d'un alliage Fe-Ni dont le coefficient de dilatation thermique entre 20°C et 150°C est inférieur à 2x10-6/K,, et le cadre support est réalisé en alliage Fe-Ni durci ayant un coefficient de dilatation thermique entre 20°C et 150°C inférieur à 5x10-6/K, une limite d'élasticité Rp0,2 à 20°C supérieure à 700 MPa et un allongement par fluage à 500°C inférieur à 0,01% sous une contrainte de 300MPa.In a first embodiment, the shadow mask consists of an Fe-Ni alloy whose coefficient of thermal expansion between 20 ° C and 150 ° C is less than 2x10 -6 / K ,, and the support frame is made of hardened Fe-Ni alloy having a coefficient of thermal expansion between 20 ° C and 150 ° C less than 5x10 -6 / K, an elastic limit Rp0,2 at 20 ° C greater than 700 MPa and an elongation by creep at 500 ° C less than 0.01% under a stress of 300MPa.

L'alliage dont est constitué le masque d'ombre a une composition chimique qui comprend, en poids : 32%≤ Ni ≤ 37% 0% ≤ Co ≤ 5,5% 0% ≤ Mn ≤ 0,5% Si ≤ 0,2% C ≤ 0,02% S≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.The alloy of which the shadow mask is made has a chemical composition which comprises, by weight: 32% ≤ Ni ≤ 37% 0% ≤ Co ≤ 5.5% 0% ≤ Mn ≤ 0.5% If ≤ 0.2% C ≤ 0.02% S≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing.

Cet alliage est par exemple, soit un alliage contenant de 35% à 37% de nickel, moins de 0,4%, ou mieux moins de 0,1%, de manganèse et pas de cobalt, ou bien un alliage contenant de 32% à 34% de nickel, 3,5% à5,5% de cobalt et moins de 0,1% de manganèse.This alloy is, for example, an alloy containing from 35% to 37% of nickel, less than 0.4%, or better still less than 0.1%, of manganese and no cobalt, or well an alloy containing from 32% to 34% of nickel, 3.5% to 5.5% of cobalt and less 0.1% manganese.

Cet alliage peut être utilisé à l'état recuit au dessus de 750°C après laminage à froid pour avoir une limite d'élasticité comprise entre 260 MPa et 300 MPa et un allongement par fluage à 500°C inférieur à 0,02% sous une contrainte de 50 MPa. Dans ce cas, la tension du masque d'ombre doit, de préférence, ne pas générer dans la zone gravée du masque d'ombre, une contrainte supérieure à 60MPa, ce qui, compte tenu du faible coefficient de dilatation, est suffisant pour minimiser les effets des échauffements locaux.This alloy can be used in the annealed state above 750 ° C. after rolling. cold to have a yield strength between 260 MPa and 300 MPa and a creep elongation at 500 ° C less than 0.02% under a stress of 50 MPa. In this case, the tension of the shadow mask should preferably not generate in the engraved area of the shadow mask, a stress greater than 60 MPa, this which, given the low coefficient of expansion, is sufficient to minimize the effects of local heating.

L'alliage peut, également, être utilisé à l'état écroui, ou mieux, écroui et détensionné ; dans ce dernier cas, notamment, la tension du masque d'ombre peut atteindre 120MPa. Une telle tension peut permettre d'améliorer le comportement vibratoire du masque d'ombre.The alloy can also be used in the hardened state, or better, hardened and relaxed; in the latter case, in particular, the tension of the shadow mask can reach 120MPa. Such tension can improve behavior vibration of the shadow mask.

L'alliage Fe-Ni durci dont est constitué le cadre support est, par exemple, soit un alliage du type « durci γ' », soit un alliage du type « durci carbures », soit du type « durci béryllium », soit du type « durci par solution solide ».The hardened Fe-Ni alloy from which the support frame is made is, for example, either an alloy of the “hardened γ '” type, either an alloy of the “hardened carbides” type, or of the type "Hardened beryllium", or of the type "hardened by solid solution".

La composition chimique d'un alliage du type « durci γ' » comprend, par exemple, en % en poids : 40,5% ≤ Ni + Co + Cu ≤ 44,5% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1,5% ≤ Ti ≤ 3,5% 0,05% ≤ Al ≤ 1% C ≤ 0,05% Si ≤ 0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.The chemical composition of an alloy of the “hardened γ '” type includes, for example, in% by weight: 40.5% ≤ Ni + Co + Cu ≤ 44.5% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1.5% ≤ Ti ≤ 3.5% 0.05% ≤ Al ≤ 1% C ≤ 0.05% If ≤ 0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing.

La teneur en nickel est choisie pour obtenir un coefficient de dilatation thermique satisfaisant. Un partie du nickel peut être substituée par du cobalt ou par du cuivre, si bien que ces éléments sont donnés à titre optionnel et leurs teneurs peuvent être nulles. The nickel content is chosen to obtain a coefficient of expansion satisfactory thermal. Part of the nickel can be substituted by cobalt or by copper, so these elements are given on an optional basis and their contents can be zero.

Le titane et l'aluminium permettent d'obtenir un durcissement structural par précipitation homogène et cohérente de la phase γ' Ni3(Ti,Al).Titanium and aluminum make it possible to obtain a structural hardening by homogeneous and coherent precipitation of the γ 'Ni 3 (Ti, Al) phase.

Lorsque l'alliage utilisé est du type « durci γ' », le cadre support de masque d'ombre est fabriqué à partir d'une bande d'épaisseur comprise, par exemple, entre 0,5 mm et 3 mm, obtenue par laminage à froid et recuit à une température comprise, de préférence, entre 900°C et 1100°C. Après le recuit, la bande peut éventuellement subir un laminage à froid complémentaire avec un taux de corroyage inférieur à 30%, suivi d'un détensionnement au défilé suffisamment rapide pour évoter la précipitation de la phase γ', à une température comprise entre 400°C et 600°C.When the alloy used is of the “hardened γ '” type, the mask support frame shade is made from a strip of thickness between, for example, between 0.5 mm and 3 mm, obtained by cold rolling and annealing at a temperature included, preferably between 900 ° C and 1100 ° C. After annealing, the strip can optionally undergo additional cold rolling with a rate of wrought less than 30%, followed by relaxation in the parade fast enough to evacuate the precipitation of the γ 'phase at a temperature between 400 ° C and 600 ° C.

Pour fabriquer le cadre support de masque d'ombre, on découpe dans la bande des pièces qui sont mises en forme, par exemple par pliage, et assemblées ou fixées par soudage, par vissage, par clinchage, ou par tout autre moyen, de façon à obtenir une ébauche de cadre support. L'ébauche de cadre support est alors soumise à un traitement thermique de durcissement par précipitation consistant en un maintien à une température comprise entre 600°C et 800°C pendant un temps compris entre 30 minutes et 2 heures.To make the shadow mask support frame, cut from the strip of parts which are shaped, for example by folding, and assembled or fixed by welding, screwing, clinching, or by any other means, so to obtain a draft support frame. The draft support frame is then subjected to a precipitation hardening heat treatment consisting of maintaining at a temperature between 600 ° C and 800 ° C for a time between 30 minutes and 2 hours.

Le cadre peut également être fabriqué par découpage, mise en forme et assemblage d'une bande préalablement écrouie et durcie par traitement thermique au défilé entre 700°C et 850°C pendant 1 à 15 minutes, ou par traitement thermique statique entre 600°C et 800°C pendant un temps compris entre 30 minutes et 2 heures. Dans ce cas, le traitement thermique est réalisé sur une bande directement issue du laminage à froid.The frame can also be manufactured by cutting, shaping and assembly of a strip previously hardened and hardened by heat treatment parade between 700 ° C and 850 ° C for 1 to 15 minutes, or by heat treatment static between 600 ° C and 800 ° C for a time between 30 minutes and 2 hours. In this case, the heat treatment is carried out on a strip directly from cold rolling.

Dans les deux cas, le traitement thermique de durcissement permet d'obtenir une limite d'élasticité Rp0,2 supérieure à 700MPa.In both cases, the hardening heat treatment makes it possible to obtain an elastic limit Rp0,2 greater than 700MPa.

A titre d'exemple, avec un alliage du type « durci γ' » dont la composition chimique comprend (en % en poids) : Ni Co Cu Ti Al C Si Mn S P Fe 42,4 0,02 0,01 2,57 0,18 0,01 0,03 0,10 0,002 0,005 Bal. après traitement de durcissement à 700°C pendant 1 heure, effectué sur une bande recuite à 960°C pendant 30 minutes après laminage à froid, on obtient les caractéristiques mécaniques suivantes : limite d'élasticité Rp0,2 860 MPa résistance à la traction Rm 1156 MPa allongement uniforme Au 13,8 % allongement total At 17,1 % Le coefficient de dilatation thermique de cet alliage est de 3,4x10-6/K entre 20°C et 150°C.By way of example, with an alloy of the “hardened γ '” type, the chemical composition of which comprises (in% by weight): Or Co Cu Ti Al VS Yes Mn S P Fe 42.4 0.02 0.01 2.57 0.18 0.01 0.03 0.10 0.002 0.005 Ball. after hardening treatment at 700 ° C for 1 hour, carried out on an annealed strip at 960 ° C for 30 minutes after cold rolling, the following mechanical characteristics are obtained: yield strength Rp0,2 860 MPa tensile strength Rm 1156 MPa uniform elongation Au 13.8% total elongation At 17.1% The coefficient of thermal expansion of this alloy is 3.4x10 -6 / K between 20 ° C and 150 ° C.

La composition chimique d'un alliage du type « durci carbures » comprend, par exemple, en % en poids: 36% ≤ Ni + Co +Cu ≤ 40% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1,6% ≤ Mo ≤ 2,8% 0,4% ≤ Cr ≤ 1,5% 0,15% ≤ C ≤ 0,35% Si ≤ 0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.The chemical composition of an alloy of the “hardened carbides” type comprises, for example, in% by weight: 36% ≤ Ni + Co + Cu ≤ 40% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1.6% ≤ Mo ≤ 2.8% 0.4% ≤ Cr ≤ 1.5% 0.15% ≤ C ≤ 0.35% If ≤ 0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing.

La teneur en nickel est choisie pour obtenir un coefficient de dilatation thermique entre 20°C et 150°C inférieur à 5x10-6/K. Le nickel peut être remplacé partiellement par du cobalt ou par du cuivre, si bien que ces éléments sont optionnels. Le molybdène, le chrome et le carbone permettent la formation de carbures qui durcissent la structure.The nickel content is chosen to obtain a coefficient of thermal expansion between 20 ° C and 150 ° C less than 5x10 -6 / K. Nickel can be partially replaced by cobalt or copper, so these are optional. Molybdenum, chromium and carbon allow the formation of carbides which harden the structure.

Avec cet alliage, le cadre support est fabriqué par découpage, pliage et assemblage par soudage, clinchage, vissage ou tout autre moyen, d'une bande obtenue par laminage à froid avec un taux de corroyage compris entre 60% et 80%, suivi d'un traitement thermique de durcissement pouvant être réalisé au défilé pendant 1 à 15 minutes entre 750°C et 850°C, ou en statique pendant 15 minutes à 2 heures, entre 650°C et 750°C. Eventuellement, après le traitement thermique de durcissement, la bande peut subir un laminage à froid complémentaire avec un taux de corroyage inférieur à 70% suivi d'un traitement thermique de détensionnement entre 400°C et 600°C, pendant 30 secondes à 5 minutes. La bande ainsi obtenue a une limite d'élasticité supérieure à 700MPa et un allongement à rupture supérieur à 5% suffisant pour permettre la mise en forme par pliage. With this alloy, the support frame is produced by cutting, folding and assembly by welding, clinching, screwing or any other means, of a strip obtained by cold rolling with a degree of wrought between 60% and 80%, followed by a hardening heat treatment which can be carried out at the parade for 1 to 15 minutes between 750 ° C and 850 ° C, or static for 15 minutes at 2 hours, between 650 ° C and 750 ° C. Possibly, after the heat treatment of hardening, the strip can undergo additional cold rolling with a rate of wrinkling less than 70% followed by a stress relieving treatment between 400 ° C and 600 ° C, for 30 seconds to 5 minutes. The strip thus obtained has a yield strength greater than 700MPa and an elongation at break greater than 5% sufficient to allow shaping by folding.

A titre d'exemple, avec un alliage du type « durci carbures » ayant la composition chimique suivante (en % en poids) : Ni Co Mo Cr C Si Mn S P Fe 37,9 0,05 2,05 0,80 0,24 0,16 0,20 <0,001 0,006 Bal. après laminage à froid avec un taux de corroyage de 70% et traitement thermique de durcissement au défilé à 800°C pendant 1 à 2 minutes, on obtient les caractéristiques mécaniques suivantes : limite d'élasticité Rp0,2 766 MPa résistance à la traction Rm 922 MPa allongement réparti Au 14,8 % allongement total At 15,1 % Le coefficient de dilatation thermique entre 20°C et 150°C est de 3,7x10-6/K.For example, with an alloy of the “hardened carbides” type having the following chemical composition (in% by weight): Or Co Mo Cr VS Yes Mn S P Fe 37.9 0.05 2.05 0.80 0.24 0.16 0.20 <0.001 0.006 Ball. after cold rolling with a degree of wroughtness of 70% and heat treatment of curing at runway at 800 ° C for 1 to 2 minutes, the following mechanical characteristics are obtained: yield strength Rp0,2 766 MPa tensile strength Rm 922 MPa distributed elongation Au 14.8% total elongation At 15.1% The coefficient of thermal expansion between 20 ° C and 150 ° C is 3.7x10 -6 / K.

Lorsqu'on effectue un laminage à froid complémentaire avec un taux de corroyage de 30% et qu'on effectue un détensionnement à 700°C pendant 1 à 2 minutes, on obtient les caractéristiques suivantes : limite d'élasticité Rp0,2 1013 MPa résistance à la traction Rm 1090 MPa allongement réparti Au 7,9 % allongement total At 11,6 % le coefficient de dilatation entre 20°C et 150°C est de 2,8x10-6/K.When an additional cold rolling is carried out with a working rate of 30% and a stress relieving is carried out at 700 ° C. for 1 to 2 minutes, the following characteristics are obtained: yield strength Rp0,2 1013 MPa tensile strength Rm 1090 MPa distributed elongation Au 7.9% total elongation At 11.6% the coefficient of expansion between 20 ° C and 150 ° C is 2.8x10 -6 / K.

La composition chimique d'un alliage du type « durci béryllium », comprend, par exemple, en % en poids : 34% ≤ Ni + Co +Cu ≤ 38% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 0,15% ≤ Be ≤ 1% C ≤ 0,05% Si ≤ 0,5% Mn ≤ 1% S ≤ 0,01% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration. The chemical composition of an alloy of the “hardened beryllium” type includes, for example, in% by weight: 34% ≤ Ni + Co + Cu ≤ 38% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 0.15% ≤ Be ≤ 1% C ≤ 0.05% If ≤ 0.5% Mn ≤ 1% S ≤ 0.01% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing.

Avec cet alliage, le cadre support est fabriqué par découpage, pliage et assemblage par soudage, clinchage, vissage ou tout autre moyen, d'une bande obtenue par laminage à froid avec un taux de corroyage compris entre 20% et 80%, suivi d'un traitement thermique de durcissement consistant en un maintien entre 400°C et 700°C pendant 1 minute à 8 heures.With this alloy, the support frame is produced by cutting, folding and assembly by welding, clinching, screwing or any other means, of a strip obtained by cold rolling with a degree of wrought between 20% and 80%, followed by a hardening heat treatment consisting of holding between 400 ° C and 700 ° C for 1 minute to 8 hours.

A titre d'exemple, avec un alliage du type « durci béryllium» ayant la composition chimique suivante (en % en poids) : Ni Co Cu Be C Si Mn S P Fe 36,2 0,10 0,05 0,25 0,04 0,20 0,64 0,003 0,006 Bal. après laminage à froid avec un taux de corroyage de 60% et traitement thermique de durcissement à 550°C pendant 1 heure, on obtient les caractéristiques mécaniques suivantes : limite d'élasticité Rp0,2 843 MPa résistance à la traction Rm 916 MPa allongement total At 4,2 % For example, with an alloy of the “hardened beryllium” type having the following chemical composition (in% by weight): Or Co Cu Be VS Yes Mn S P Fe 36.2 0.10 0.05 0.25 0.04 0.20 0.64 0.003 0.006 Ball. after cold rolling with a degree of wroughtness of 60% and heat treatment of hardening at 550 ° C for 1 hour, the following mechanical characteristics are obtained: yield strength Rp0,2 843 MPa tensile strength Rm 916 MPa total elongation At 4.2%

La composition chimique d'un alliage du type « durci par solution solide», comprend, par exemple, en % en poids : 38% ≤ Ni + Co + Cu ≤ 42% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1% ≤ Nb ≤ 4% C ≤ 0,05% Si ≤ 0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.The chemical composition of an alloy of the “hardened by solid solution” type includes, for example, in% by weight: 38% ≤ Ni + Co + Cu ≤ 42% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1% ≤ Nb ≤ 4% C ≤ 0.05% If ≤ 0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing.

Avec cet alliage, le cadre support est fabriqué par découpage, pliage et assemblage par soudage, clinchage, vissage ou tout autre moyen, d'une bande obtenue par laminage à froid avec un taux de corroyage compris entre 20% et 70%, suivi d'un traitement thermique de détensionnement consistant en un maintien entre 400°C et 600°C. With this alloy, the support frame is produced by cutting, folding and assembly by welding, clinching, screwing or any other means, of a strip obtained by cold rolling with a degree of wrought between 20% and 70%, followed by a stress relieving treatment consisting of maintaining between 400 ° C and 600 ° C.

A titre d'exemple, avec un alliage du type « durci par solution solide » ayant la composition chimique suivante (en % en poids) : Ni Co Cu Nb C Si Mn S P Fe 39,8 0,04 0,20 1,98 0,005 0,10 0,38 0,001 0,004 Bal. après laminage à froid avec un taux de corroyage de 33% et traitement thermique de détensionnement à 550°C pendant 1 minute, on obtient les caractéristiques mécaniques suivantes : limite d'élasticité Rp0,2 804 MPa résistance à la traction Rm 968 MPa allongement total At 8,1 % By way of example, with an alloy of the “solid solution hardened” type having the following chemical composition (in% by weight): Or Co Cu Nb VS Yes Mn S P Fe 39.8 0.04 0.20 1.98 0.005 0.10 0.38 0.001 0.004 Ball. after cold rolling with a wrought rate of 33% and thermal stress relieving treatment at 550 ° C for 1 minute, the following mechanical characteristics are obtained: yield strength Rp0,2 804 MPa tensile strength Rm 968 MPa total elongation At 8.1%

L'utilisation d'alliages à faible coefficient de dilatation permet d'obtenir une bonne compatibilité entre le masque d'ombre et son cadre support, en particulier d'éviter une variation trop importante de la tension du masque d'ombre lorsque la température varie, du fait de dilatations différentielles.The use of alloys with a low coefficient of expansion makes it possible to obtain a good compatibility between the shadow mask and its support frame, in particular avoid too great a variation in the shade mask tension when the temperature varies, due to differential expansions.

La limite d'élasticité Rp0,2 à 20°C supérieure à 700 MPa et la très bonne résistance au fluage à 500°C permettent de fabriquer un cadre léger puisque les contraintes auxquelles sont soumises ses éléments peuvent être élevées. La légèreté du cadre support favorise une faible sensibilité du dispositif de masquage aux variations de température.The elastic limit Rp0,2 at 20 ° C higher than 700 MPa and the very good resistance to creep at 500 ° C makes it possible to manufacture a light frame since the the constraints to which its elements are subjected can be high. The lightness of the support frame promotes low sensitivity of the masking device temperature variations.

La bonne tenue au fluage des alliages dont sont constitués le masque d'ombre et le cadre support, permet de conserver une tension du masque d'ombre satisfaisante après le chauffage au voisinage de 500°C destiné à sceller la dalle écran sur le cône en verre du tube cathodique, et cela d'autant plus que la tension recherchée pour le masque d'ombre n'est pas trop élevée.The good creep resistance of the alloys of which the mask is made shade and the support frame, allows to keep a tension of the shadow mask satisfactory after heating in the vicinity of 500 ° C intended to seal the slab screen on the glass cone of the cathode ray tube, all the more so as the voltage sought for the shadow mask is not too high.

Par ailleurs, et comme le montrent les courbes de la figure 2, alors que le coefficient de dilatation moyen entre 20°C et 150°C de l'alliage dont est constitué le masque d'ombre (courbe 10, alliage FeNi) est plus faible que celui de l'alliage dont est constitué le cadre support (courbe 11, alliage FeNi durci), les coefficients de dilatation moyen entre 20°C et 500°C sont voisins. Ceci est favorable. En effet, à 500°C la dilatation du cadre support étant voisine de celle du masque d'ombre, la tension du masque d'ombre reste voisine de la tension créée au montage. En revanche, entre 100°C et 150°C environ, c'est à dire aux températures de fonctionnement du masque d'ombre, la tension est augmentée du fait du différentiel de dilatation, et ceci conduit à diminuer la sensibilité aux échauffements locaux,et surtout à diminuer la sensibilité aux vibrations.Furthermore, and as the curves in FIG. 2 show, while the average coefficient of expansion between 20 ° C and 150 ° C of the alloy from which the shadow mask (curve 10, FeNi alloy) is weaker than that of the alloy whose the support frame is formed (curve 11, hardened FeNi alloy), the coefficients of mean expansion between 20 ° C and 500 ° C are close. This is favorable. Indeed, at 500 ° C the expansion of the support frame being close to that of the shadow mask, the tension of the shadow mask remains close to the tension created during assembly. In however, between about 100 ° C and 150 ° C, i.e. at temperatures of operation of the shadow mask, the voltage is increased due to the differential dilation, and this leads to a decrease in sensitivity to local heating, and especially to reduce the sensitivity to vibrations.

A titre de comparaison, la courbe 12 de la figure 2, relative à un acier faiblement allié, montre que le différentiel de dilatation entre cet acier et l'alliage Fe-Ni à faible coefficient de dilatation est tel que si le cadre support était constitué d'acier et le masque d'ombre d'alliage Fe-Ni à faible coefficient de dilatation, en l'absence de moyens de compensation adaptés, le chauffage réalisé au moment du scellement du tube cathodique conduirait à la rupture du masque d'ombre.By way of comparison, curve 12 in FIG. 2, relating to a steel weakly alloyed, shows that the expansion differential between this steel and the Fe-Ni alloy with low coefficient of expansion is such that if the support frame were constituted steel and the shadow mask of Fe-Ni alloy with low coefficient of expansion, in the absence of suitable compensation means, the heating carried out at the time of sealing the cathode ray tube would lead to the rupture of the shadow mask.

Dans un deuxième mode de réalisation, le cadre support est réalisé, comme dans le premier mode de réalisation, en alliage Fe-Ni durci, par exemple du type « durci γ' », du type « durci carbures », du type « durci béryllium » ou du type « durci par solution solide ». Mais, le masque d'ombre lui même est également constitué d'un alliage Fe-Ni durci, par exemple du type « durci γ' », du type « durci carbures », du type « durci béryllium » ou du type « durci par solution solide » tels que décrits ci-dessus. Dans ce cas, le traitement de durcissement est réalisé avant gravage chimique du masque d'ombre. Le masque d'ombre est ensuite monté sur le cadre support avec une tension qui peut être supérieure à 150MPa, voire supérieure à 200MPa (mais cette tension doit rester inférieure à 300MPa), ce qui permet d'augmenter la fréquence propre de vibration ou de réduire l'épaisseur du masque d'ombre. Une telle tension du masque d'ombre est rendue possible par les caractéristiques de traction et de résistance au fluage de l'alliage à durcissement structural qui sont sensiblement plus élevées que celles de l'alliage Fe-Ni recuit utilisé dans le premier mode de réalisation.In a second embodiment, the support frame is produced, as in the first embodiment, of hardened Fe-Ni alloy, for example of the type "Hardened γ '", of the type "hardened carbides", of the type "hardened beryllium" or of the type "hardened by solid solution ". But, the shadow mask itself is also made up a hardened Fe-Ni alloy, for example of the “hardened γ '” type, of the “hardened carbides” type, of the “hardened beryllium” type or of the “hardened by solid solution” type as described above. In this case, the hardening treatment is carried out before etching shadow mask chemical. The shadow mask is then mounted on the frame support with a tension which can be higher than 150MPa, even higher than 200MPa (but this tension must remain lower than 300MPa), which allows to increase the natural frequency of vibration or to reduce the thickness of the mask shade. Such tension of the shadow mask is made possible by the tensile and creep resistance characteristics of the hardening alloy which are significantly higher than those of the annealed Fe-Ni alloy used in the first embodiment.

Claims (15)

Dispositif de masquage pour tube cathodique de visualisation en couleur à écran plat, du type comprenant un cadre support pour masque d'ombre tendu et un masque d'ombre tendu monté sur le cadre support de façon à être soumis à une tension à la température ambiante, caractérisé en ce que : le cadre support est en alliage Fe-Ni durci ayant un coefficient de dilatation thermique entre 20°C et 150°C inférieur à 5x10-6/K et une limite d'élasticité Rp0,2 à 20°C supérieure à 700 MPa, le masque d'ombre tendu est en alliage Fe-Ni ou FeNi durci ayant un coefficient de dilatation thermique entre 20°C et 150°C inférieur à 5x10-6/K. Masking device for flat-screen color display cathode ray tube, of the type comprising a support frame for a stretched shadow mask and a stretched shadow mask mounted on the support frame so as to be subjected to a tension at ambient temperature , characterized in that: the support frame is made of hardened Fe-Ni alloy having a coefficient of thermal expansion between 20 ° C and 150 ° C less than 5x10 -6 / K and an elastic limit Rp0.2 at 20 ° C greater than 700 MPa, the stretched shadow mask is made of hardened Fe-Ni or FeNi alloy having a coefficient of thermal expansion between 20 ° C and 150 ° C less than 5x10 -6 / K. Dispositif selon la revendication 1 caractérisé en ce que l'alliage Fe-Ni durci dont est constitué le cadre support est un alliage FeNi du type « durci γ' » dont la composition chimique comprend, en poids : 40,5% ≤ Ni + Co + Cu ≤ 44,5% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1,5% ≤ Ti ≤ 3,5% 0,05% ≤ Al ≤ 1% C ≤ 0,05% Si ≤ 0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.Device according to Claim 1, characterized in that the hardened Fe-Ni alloy of which the support frame is made up is an FeNi alloy of the "hardened γ '" type, the chemical composition of which comprises, by weight: 40.5% ≤ Ni + Co + Cu ≤ 44.5% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1.5% ≤ Ti ≤ 3.5% 0.05% ≤ Al ≤ 1% C ≤ 0.05% If ≤ 0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing. Dispositif selon la revendication 1 caractérisé en ce que l'alliage Fe-Ni durci dont est constitué le cadre support est un alliage FeNi du type « durci carbures » dont la composition chimique comprend, en poids : 36% ≤ Ni + Co +Cu ≤ 40% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1,6% ≤ Mo ≤ 2,8% 0,4% ≤ Cr ≤1,5% 0,15% ≤ C ≤ 0,35% Si ≤ 0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.Device according to Claim 1, characterized in that the hardened Fe-Ni alloy of which the support frame is made up is an FeNi alloy of the "hardened carbide" type, the chemical composition of which comprises, by weight: 36% ≤ Ni + Co + Cu ≤ 40% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1.6% ≤ Mo ≤ 2.8% 0.4% ≤ Cr ≤1.5% 0.15% ≤ C ≤ 0.35% If ≤ 0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing. Dispositif selon la revendication 1 caractérisé en ce que l'alliage Fe-Ni durci dont est constitué le cadre support est un alliage FeNi du type « durci béryllium » dont la composition chimique comprend, en poids : 34% ≤ Ni + Co +Cu ≤ 38% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 0,15% ≤ Be ≤ 1% C ≤ 0,05% Si ≤ 0,5% Mn ≤ 1% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.Device according to Claim 1, characterized in that the hardened Fe-Ni alloy from which the support frame is made up is an FeNi alloy of the "hardened beryllium" type, the chemical composition of which comprises, by weight: 34% ≤ Ni + Co + Cu ≤ 38% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 0.15% ≤ Be ≤ 1% C ≤ 0.05% If ≤ 0.5% Mn ≤ 1% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing. Dispositif selon la revendication 1 caractérisé en ce que l'alliage Fe-Ni durci dont est constitué le cadre support est un alliage FeNi du type « durci par solution solide » dont la composition chimique comprend, en poids : 38% ≤ Ni + Co + Cu ≤ 42% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1% ≤ Nb ≤ 4% C ≤ 0,05% Si ≤0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.Device according to Claim 1, characterized in that the hardened Fe-Ni alloy of which the support frame is made up is an FeNi alloy of the "hardened by solid solution" type, the chemical composition of which comprises, by weight: 38% ≤ Ni + Co + Cu ≤ 42% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1% ≤ Nb ≤ 4% C ≤ 0.05% If ≤0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing. Dispositif selon l'une quelconque des revendications 1 à 5 caractérisé en ce que le masque d'ombre est en alliage Fe-Ni dont le coefficient de dilatation thermique entre 20°C et 150°C est inférieur à 2x10-6/K.Device according to any one of Claims 1 to 5, characterized in that the shadow mask is made of an Fe-Ni alloy whose coefficient of thermal expansion between 20 ° C and 150 ° C is less than 2x10 -6 / K. Dispositif selon la revendication 6 caractérisé en ce que la composition chimique de l'alliage dont est constitué le masque d'ombre comprend, en poids: 32% ≤ Ni ≤ 37% 0% ≤ Co ≤ 5,5% 0% ≤ Mn ≤ 0,5% Si ≤ 0,2% C ≤ 0,02% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.Device according to Claim 6, characterized in that the chemical composition of the alloy from which the shadow mask is made up comprises, by weight: 32% ≤ Ni ≤ 37% 0% ≤ Co ≤ 5.5% 0% ≤ Mn ≤ 0.5% If ≤ 0.2% C ≤ 0.02% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing. Dispositif selon l'une quelconque des revendications 1 à 5 caractérisé en ce que la tension du masque d'ombre est supérieure à 150 MPa et en ce que la composition chimique de l'alliage dont est constitué le masque d'ombre comprend, en poids : 40,5% ≤ Ni + Co + Cu ≤ 44,5% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1,5% ≤ Ti ≤ 3,5% 0,05% ≤ Al ≤ 1% C ≤ 0,05% Si ≤ 0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration. Device according to any one of Claims 1 to 5, characterized in that the tension of the shadow mask is greater than 150 MPa and in that the chemical composition of the alloy of which the shadow mask is made up comprises, by weight : 40.5% ≤ Ni + Co + Cu ≤ 44.5% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1.5% ≤ Ti ≤ 3.5% 0.05% ≤ Al ≤ 1% C ≤ 0.05% If ≤ 0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing. Dispositif selon l'une quelconque des revendications 1 à 5 caractérisé en ce que la tension du masque d'ombre est supérieure à 150 MPa et en ce que la composition chimique de l'alliage dont est constitué le masque d'ombre comprend, en poids : 36% ≤ Ni + Co +Cu ≤ 40% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1,6% ≤ Mo ≤ 2,8% 0,4% ≤ Cr ≤ 1,5% 0,15% ≤ C ≤ 0,35% Si ≤ 0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.Device according to any one of Claims 1 to 5, characterized in that the tension of the shadow mask is greater than 150 MPa and in that the chemical composition of the alloy of which the shadow mask is made up comprises, by weight : 36% ≤ Ni + Co + Cu ≤ 40% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1.6% ≤ Mo ≤ 2.8% 0.4% ≤ Cr ≤ 1.5% 0.15% ≤ C ≤ 0.35% If ≤ 0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing. Dispositif selon l'une quelconque des revendications 1 à 5 caractérisé en ce que la tension du masque d'ombre est supérieure à 150 MPa et en ce que la composition chimique de l'alliage dont est constitué le masque d'ombre comprend, en poids : 34% ≤ Ni + Co +Cu ≤ 38% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 0,15% ≤ Be ≤ 1% C ≤ 0,05% Si ≤ 0,5% Mn ≤ 1% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.Device according to any one of Claims 1 to 5, characterized in that the tension of the shadow mask is greater than 150 MPa and in that the chemical composition of the alloy of which the shadow mask is made up comprises, by weight : 34% ≤ Ni + Co + Cu ≤ 38% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 0.15% ≤ Be ≤ 1% C ≤ 0.05% If ≤ 0.5% Mn ≤ 1% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing. Dispositif selon l'une quelconque des revendications 1 à 5 caractérisé en ce que la tension du masque d'ombre est supérieure à 150 MPa et en ce que la composition chimique de l'alliage dont est constitué le masque d'ombre comprend, en poids : 38% ≤ Ni + Co + Cu ≤ 42% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1% ≤ Nb ≤ 4% C ≤ 0,05% Si ≤ 0,5% Mn ≤ 0,5% S ≤ 0,01% P ≤ 0,02% le reste étant du fer et des impuretés résultant de l'élaboration.Device according to any one of Claims 1 to 5, characterized in that the tension of the shadow mask is greater than 150 MPa and in that the chemical composition of the alloy of which the shadow mask is made up comprises, by weight : 38% ≤ Ni + Co + Cu ≤ 42% 0% ≤ Co ≤ 5% 0% ≤ Cu ≤ 3% 1% ≤ Nb ≤ 4% C ≤ 0.05% If ≤ 0.5% Mn ≤ 0.5% S ≤ 0.01% P ≤ 0.02% the remainder being iron and impurities resulting from processing. Procédé pour la fabrication d'un dispositif selon la revendication 2 caractérisé en ce que pour fabriquer le cadre support de masque d'ombre, on utilise une bande en alliage Fe-Ni à durcissement structural recuite ou recuite et écrouie puis détensionnée, on réalise une ébauche de cadre par découpage, pliage et assemblage de la bande en alliage Fe-Ni du type « durci γ' », puis on soumet l'ébauche de cadre à un traitement thermique de durcissement à une température comprise entre 600°C et 800°C pendant un temps compris entre 30 minutes et 2 heures.Method for manufacturing a device according to claim 2 characterized in that to manufacture the shadow mask support frame, an annealed or annealed and work hardened Fe-Ni alloy strip then relaxed, a frame blank is produced by cutting, folding and assembly of the strip of Fe-Ni alloy of the “hardened γ '” type, then subject the frame blank to a temperature hardening heat treatment between 600 ° C and 800 ° C for a time between 30 minutes and 2 hours. Procédé pour la fabrication d'un dispositif selon la revendication 3 caractérisé en ce que pour fabriquer le cadre support de masque d'ombre on lamine à froid une bande en alliage Fe-Ni du type « durci carbures » avec un taux de corroyage supérieur à 50%, on soumet la bande laminée à froid à un traitement thermique de durcissement, soit réalisé au défilé à une température comprise entre 750°C et 850°C pendant 1 à 15 minutes, soit en statique à une température comprise entre 650°C et 750°C pendant 15 minutes à 2 heures, éventuellement, on effectue un laminage à froid complémentaire avec un taux de corroyage inférieur à 70% suivi d'un traitement thermique de détensionnement à une température comprise entre 400°C et 600°C pendant 30 secondes à 5 minutes, et on fabrique le cadre support de masque d'ombre par découpage, pliage et assemblage de la bande. Method for manufacturing a device according to claim 3 characterized in that to make the shadow mask support frame, laminate cold a strip of Fe-Ni alloy of the “hardened carbide” type with a rate of wrought above 50%, the cold rolled strip is subjected to a treatment thermal hardening, either performed on parade at a temperature between 750 ° C and 850 ° C for 1 to 15 minutes, i.e. static at a temperature between 650 ° C and 750 ° C for 15 minutes to 2 hours, possibly, we performs additional cold rolling with a wrought rate less than 70% followed by a stress relieving heat treatment at a temperature between 400 ° C and 600 ° C for 30 seconds to 5 minutes, and the shadow mask support frame by cutting, folding and assembling the bandaged. Procédé pour la fabrication d'un dispositif selon la revendication 4 caractérisé en ce que pour fabriquer le cadre support de masque d'ombre on lamine à froid une bande en alliage Fe-Ni du type « durci béryllium» avec un taux de corroyage compris entre 20% et 80%, on soumet la bande laminée à froid à un traitement thermique de durcissement à une température comprise entre 400°C et 700°C pendant 1 minute à 8 heures, et on fabrique le cadre support de masque d'ombre par découpage, pliage et assemblage de la bande.Method for manufacturing a device according to claim 4 characterized in that to make the shadow mask support frame, laminate when cold, a strip of Fe-Ni alloy of the “hardened beryllium” type with a rate of wrought between 20% and 80%, the cold rolled strip is subjected to a hardening heat treatment at a temperature between 400 ° C and 700 ° C for 1 minute to 8 hours, and we make the mask support frame shade by cutting, folding and assembling the strip. Procédé pour la fabrication d'un dispositif selon la revendication 5 caractérisé en ce que pour fabriquer le cadre support de masque d'ombre on lamine à froid une bande en alliage Fe-Ni du type « durci par solution solide » avec un taux de corroyage compris entre 20% et 70%, on soumet la bande laminée à froid à un traitement thermique de détensionnement à une température comprise entre 400°C et 600°C, et on fabrique le cadre support de masque d'ombre par découpage, pliage et assemblage de la bande.Method for manufacturing a device according to claim 5 characterized in that to make the shadow mask support frame, laminate cold a strip of Fe-Ni alloy of the “hardened by solid solution” type with a rate from 20% to 70%, the cold rolled strip is subjected to a stress relieving heat treatment at a temperature between 400 ° C and 600 ° C, and we make the shadow mask support frame by cutting, folding and assembly of the strip.
EP00401772A 1999-06-22 2000-06-21 Masking device for a colour flat screen cathode ray tube comprising a supporting frame for planar mask and planar mask Expired - Lifetime EP1063304B1 (en)

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FR9907909 1999-06-22
FR9907909A FR2795431B1 (en) 1999-06-22 1999-06-22 FLAT SCREEN COLOR VIEWING CATHODIC TUBE MASKING DEVICE, OF THE TYPE INCLUDING A SUPPORT FRAME FOR TENDERED SHADOW MASK AND TENDER SHADOW MASK

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EP1156126A1 (en) * 2001-01-24 2001-11-21 Imphy Ugine Precision Process for manufacturing an Fe-Ni alloy strip
WO2001092587A1 (en) * 2000-05-30 2001-12-06 Imphy Ugine Precision Hardened fe-ni alloy for making integrated circuit grids and method for making same
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FR2807269A1 (en) * 2000-03-31 2001-10-05 Imphy Ugine Precision MASKING DEVICE FOR FLAT SCREEN COLOR DISPLAY CATHODIC TUBE WITH SHADOW MASK TENSION IN FE-NI ALLOYS
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WO2003044822A1 (en) * 2001-11-20 2003-05-30 Thomson Licensing S. A. Cathode ray tube mask frame assembly
WO2003079395A1 (en) * 2002-03-13 2003-09-25 Thomson Licensing S. A. Color picture tube having a low expansion tensioned mask attached to a higher expansion frame
WO2007087785A1 (en) * 2006-02-02 2007-08-09 Thyssenkrupp Vdm Gmbh Iron-nickel alloy
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EP1063304B1 (en) 2002-09-04
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US6420054B1 (en) 2002-07-16
FR2795431B1 (en) 2001-12-07
CA2312415A1 (en) 2000-12-22
DE1063304T1 (en) 2002-01-17
CN1278105A (en) 2000-12-27
CN1157749C (en) 2004-07-14
ATE223502T1 (en) 2002-09-15
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BR0002870A (en) 2001-01-30
ID26429A (en) 2000-12-28

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