EP0809272A1 - Lochmaskenrahmen einer Kathodenstrahlröhre, Verfahren zur Herstellung und Aufhängung für den Rahmen - Google Patents

Lochmaskenrahmen einer Kathodenstrahlröhre, Verfahren zur Herstellung und Aufhängung für den Rahmen Download PDF

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Publication number
EP0809272A1
EP0809272A1 EP97401086A EP97401086A EP0809272A1 EP 0809272 A1 EP0809272 A1 EP 0809272A1 EP 97401086 A EP97401086 A EP 97401086A EP 97401086 A EP97401086 A EP 97401086A EP 0809272 A1 EP0809272 A1 EP 0809272A1
Authority
EP
European Patent Office
Prior art keywords
frame
membrane
membranes
alloy
sides
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
EP97401086A
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English (en)
French (fr)
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EP0809272B1 (de
Inventor
Jean-Pierre Reyal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aperam Stainless Precision SAS
Original Assignee
Imphy SA
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Filing date
Publication date
Application filed by Imphy SA filed Critical Imphy SA
Priority to EP00103229A priority Critical patent/EP0999571A3/de
Publication of EP0809272A1 publication Critical patent/EP0809272A1/de
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Publication of EP0809272B1 publication Critical patent/EP0809272B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/073—Mounting arrangements associated with shadow masks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0705—Mounting arrangement of assembly to vessel

Definitions

  • the invention relates to a mask frame perforated with a cathode ray tube and in particular with a color television tube.
  • Color television tubes with a perforated mask include a glass envelope in which are fixed metal parts, one of which is constituted by the perforated screen secured to a frame and another by a magnetic shielding placed inside the glass envelope.
  • the glass envelope is made up of two parts, a slab comprising the screen on which the image is formed and a cone on which the electron guns and the deflection coils of the electron beams of the cathode ray tube are fixed. .
  • the shadow mask is made from a thin metal strip in which holes of small dimensions and of suitable shape are made by chemical machining.
  • the metal bands used are generally made of low carbon steel or an iron-nickel alloy such as Invar.
  • the shadow mask is shaped by hot or cold stamping, so as to have a peripheral rim along which a metal frame is welded.
  • the assembly constituted by the frame and the mask is fixed inside the glass slab, by means of suspension devices fixed on the frame and coming to engage on pins sealed in the glass of the slab.
  • the internal shielding of the tube can be fixed either on the frame of the shadow mask, or on the fixing pins sealed in the glass of the slab.
  • Cathode ray tubes of different types which are distinguished in particular by the type of shadow mask or the type of frame used or again by the method of hanging the frame inside the glass envelope of the tube.
  • thin and light frames the thickness of which can be, for example, of the order of 0.2 mm and thick, rigid and heavy frames.
  • this suspension must make it possible to control the relative movements of the glass screen and of the shadow mask which are caused in particular by the expansion of the shadow mask which heats up under the impact of the electron beam, so as to maintain the purity of the colors of the image formed on the screen.
  • the suspension devices must maintain the shadow mask in position inside the glass envelope, even when the cathode ray tube receives a shock, and protect the shadow mask against external mechanical stresses.
  • suspension systems must make it possible to dismantle or move the shadow mask, during the manufacture of the cathode ray tube, then to replace it inside the glass envelope, as many times as it can be necessary.
  • the thick frames known from the prior art often have an excessively heavy weight which may be, for example, of the order of or greater than 2 kg, in the case of so-called "stretched mask” technologies, the shadow mask being tensioned on the frame, the rigidity of which must be sufficient to withstand the stresses resulting from the tensioning of the mask.
  • These thin frames have the advantage of having low thermal inertia but are very fragile, due to their small thickness. These frames also have insufficient rigidity. As a result, it may be necessary to weld the suspension devices to the fixing pins to avoid detaching the frame. The manufacture of the cathode ray tube is thus made more complex.
  • the object of the invention is therefore to propose a mask frame perforated with a cathode ray tube and in particular with a color television tube having flat sides arranged substantially along lateral sides of a straight prismatic surface and having a stiffening edge for fixing the perforated mask to the frame by means of which the perforated mask is placed inside a glass envelope of the cathode ray tube which comprises a cone and a slab comprising a screen , this frame having good mechanical rigidity, the lowest possible weight, for a given rigidity, low thermal inertia and other advantages, for example a sensitivity limited to external periodic stresses, in a frequency range ranging for example from 100 to 400 Hz.
  • the flat sides of the frame have an outer membrane and an inner membrane attached and fixed against each other and each constituted by a portion of thin metal strip.
  • At least one of the external and internal membranes is reinforced by at least one stamped part of the membrane.
  • one of the membranes, or both membranes are reinforced by ribs.
  • Figure 1 is an exploded perspective view of a cathode ray tube with a shadow mask.
  • FIGS. 2A and 2B are plan views of metal strips cut out before shaping, so as to constitute an outer membrane and an inner membrane respectively of a mask mask according to the invention and according to a first embodiment.
  • FIGS. 3A and 3B are plan views of cut and shaped metal strips, so as to constitute an outer membrane and an inner membrane respectively, of a mask mask according to the invention and according to a second embodiment .
  • FIG. 4 is an exploded perspective view showing the shaping by folding and the assembly of two metal strips as shown in FIGS. 2A and 2B, during the production of a mask mask according to the invention and according to the first embodiment.
  • Figure 5 is a top view of the metal strips shown in Figure 4, in their assembly position before welding.
  • Figure 6 is a top view, similar to the view of Figure 5, showing sheet metal strips as shown in Figures 3A and 3B, in their assembly position before welding.
  • Figures 7A, 7B, 7C and 7D are views in vertical section along 7-7 of Figure 5 or Figure 6 showing an outer membrane and a membrane internal of a perforated mask frame according to the invention in their assembly position as well as part of a mask in the assembly position on the frame.
  • FIGS. 8A, 8B and 8C are plan views showing the welding zones of an internal membrane and an external membrane of a mask mask according to the invention, attached and fixed one against the other .
  • Figure 9 is a perspective view of a shadow mask frame according to the invention in the assembled state.
  • FIG. 9A is a top view of a corner area of the frame shown in FIG. 9.
  • Figure 9B is an elevational view of the corner area of the frame shown in Figure 9A.
  • Figure 10 is a plan view of an outer membrane and an inner membrane of a shadow mask frame according to the invention illustrating a variant of the method of manufacturing a frame according to the invention.
  • Figure 11 is a perspective view of a shadow mask frame according to the invention for implementing the technology "stretch mask”.
  • Figure 12 is a perspective view of a portion of one side of a shadow mask frame according to the invention and according to an alternative embodiment.
  • FIG. 12A is a sectional view along A-A of FIG. 12.
  • FIG. 12B is a sectional view along B-B of FIG. 12.
  • Figures 13, 13A and 14 show a suspension element fixed by clipping into a corner part of a frame.
  • the cathode ray tube designated as a whole by the reference 1, comprises a glass envelope consisting of a cone 2 and a slab 3 and two metal parts 4 and 9 which are fastened inside the glass envelope of the tube.
  • the part 4 is a pre-assembled assembly comprising the perforated mask 5 constituted by a metal sheet crossed by openings 6, the frame 7 of the perforated mask and devices 8 for suspending the assembly 4 inside the slab 3 of the glass envelope.
  • the part 9 is a metal wall shaped so as to constitute an internal magnetic shield engaged in the cone 2 of the glass envelope, most often fixed on the frame.
  • the cone 2 of the glass casing has a rectangular base with rounded angles and a curved wall having a shape close to that of a cone whose section decreases towards the rear end of the cathode ray tube 1 at which are fixed on the cone 2 the electron guns and the deflection coils of the cathode ray tube.
  • the slab 3 has a slightly curved wall 3a constituting the screen of the cathode ray tube and a rim 3b whose rectangular base with rounded angles can be perfectly superimposed with the base of the cone 2.
  • On the internal surface of the rim 3b of the slab 3 are fixed pins such as 10 projecting inwards allowing the attachment of the assembly 4 comprising the shadow mask 5 and the frame 7, by means of suspension devices 8 fixed to the edges of the frame 7.
  • the cathode ray tube 1 shown in FIG. 1 is of the type comprising fixing pins 10 fixed in the middle part of the edges of the slab intended to cooperate with the suspension devices. 8 fixed in a middle position on the sides of the frame 7 of the shadow mask 5.
  • FIG. 1 the constituent parts of the cathode ray tube 1 have been shown before their assembly to constitute the cathode ray tube.
  • the manufacture is carried out, separately, of the component parts 2 and 3 of the glass envelope, of the assembly 4 and of the magnetic shielding 9. These parts are then assembled, as will be described below.
  • the shadow mask 5 is made from a thin strip in which holes 6 are made by chemical machining.
  • the perforated sheet is then shaped by hot or cold stamping to form a mask 5 comprising a peripheral assembly flange of substantially rectangular shape with rounded angles.
  • the frame 7 is fixed by welding to the assembly edge of the shadow mask 5.
  • the fixing devices 8 are then welded to the edges of the frame.
  • the assembly 4 thus produced is fixed inside the slab 3 after various heat treatments.
  • the magnetic shield 9 is then fixed, for example by clipping, to the frame 7. In certain embodiments, it is necessary to fix the shield on the pins sealed on the internal wall of the slab.
  • the glass envelope can then be assembled.
  • the frame for a shadow mask according to the invention which will be described below overcomes the drawbacks of the devices according to the prior art.
  • FIGS 2A and 2B there is shown, respectively, an outer membrane 11 and an inner membrane 12 of a shadow mask frame according to the invention.
  • the membranes 11 and 12 are produced from a strip of sheet metal or thin strip made of a metallic material, such as steel, an iron-nickel alloy or another alloy.
  • the strip of thin metal sheet is cut along an external contour making it possible to delimit four zones 11a, 11b, 11c, 11d or 12a, 12b, 12c, 12d along the length of the strip, intended to constitute the external membrane and the internal membrane, respectively, from each of the sides of the shadow mask frame, during the assembly of the strips 11 and 12 to produce a frame whose flat sides are arranged along the side faces of a rectangular parallelepiped.
  • the zones 11a and 11c on the one hand and 12a and 12c on the other hand of the strips 11 and 12 respectively are of identical shape and are intended to constitute the membranes on a large side of the frame.
  • the zones 11b and 11d on the one hand and 12b and 12d on the other hand of the strips 11 and 12 respectively are of identical shape and are intended to constitute the membranes of the short sides of the frame.
  • the metal strip is shaped, for example by stamping or burnishing, to present reinforcing ribs parallel to each other.
  • the successive zones of the strip 11 intended to constitute the outer membranes of the frame comprise ribs 13 parallel to the longitudinal edges of the strip.
  • the zones of the strip 12 intended to constitute the internal membranes of the sides of the frame have ribs 14 perpendicular to the longitudinal edges of the strip.
  • the same strip may comprise in successive zones, ribs of longitudinal direction and ribs perpendicular to the longitudinal direction.
  • corner and connection zones may also include ribs 15 (in the case of strip 11) or 16 (in the case of strip 12) which are perpendicular to the ribs 13 or 14 of the zones constituting the membranes. sides of the frame.
  • the sheets 11 or 12 are pierced, at each of the ribs 13, 15, 14 and 16, with holes 17 or 18 crossing the strip over its entire thickness, so as to avoid trapping gases between the internal and external membranes sides of the frame, when the membranes are attached to each other and welded together, as will be described below.
  • At least one of the two bands (the outer band 11 in the case of the embodiment shown in FIGS. 2A and 2B) comprises, along one of its edges, lugs 19 at each of the successive zones constituting a membrane of a wall of the frame and at the level of the corner and connection zones.
  • FIG. 7B It is also visible in FIG. 7B that a part 20 of the upper edge of the strip 11, of a width less than the lower edge 19, is also folded inwards at 90 °, which contributes to the stiffening of the frame .
  • the shadow mask 5 is attached and welded along the upper edge 20 of the frame.
  • FIG. 7B the shadow mask 5 is shown in the assembly position.
  • the rim 5a of the mask 5 is fitted against the upper part of the outer membrane of the frame, along the edge 20 folded inwardly of the frame.
  • the welding of the mask is carried out from outside the frame, as shown by arrow 51.
  • FIG. 7C an alternative embodiment of the frame and of the method of fixing the shadow mask 5 has been shown.
  • the edge 20 of the outer membrane of the frame is folded towards the outside of the frame and the rim 5a of the mask 5 is attached. against the internal membrane of the frame along the edge 20.
  • the welding can be carried out from the outside (arrow 51) or from the inside of the frame (arrow 51 ').
  • the stiffening edge 20 could be produced by folding the upper edge of the internal membrane outwards above the external membrane and the rim 5a of the mask 5 welded to the internal membrane.
  • FIG. 7D the case of a frame with a stretched mask has been shown.
  • the edge 20 and the mask 5 have the shape of cylinder portions with circular section.
  • the mask 5 is fitted against the edge 20 and fixed to the edge 20 by welding.
  • the inner membrane of the frame may also include a flange 19 'folded 90 ° inwards and superimposed on the edge 19 of the outer membrane.
  • the assembly and the forming of the frame are carried out.
  • the assembly by welding of the outer and inner membranes of the frame is carried out after folding of the strips 11 and 12 constituting these membranes.
  • the assembly by welding of the external and internal membranes of the frame in superimposed positions can be carried out before the membranes are folded.
  • the portion of the edge of the strip 11 intended to constitute the outer membrane, located opposite the tabs 19, is folded to form the stiffening flange 20 along from which the shadow mask is attached.
  • Corresponding tabs 19 ' can be provided on the strip constituting the internal membrane 12, these tabs 19' are also folded inwards at 90 °.
  • the strip 11 constituting the outer membrane is folded, as shown in FIG. 4, along the edges perpendicular to the longitudinal edges of the strip delimiting the corner areas 11e, 11f, 11g and the connection area 11h.
  • the strip 11 is placed, after folding, inside a template allowing the areas of the strip located between two corner areas to be maintained along the lateral faces of a rectangular parallelepiped, as shown in FIG. 5. then ensures the maintenance of the external strip 11 in the form given by the template, by welding one on the other of the tabs 19 constituting one of the folded edges of the strip then the strip 12 is introduced, after folding, as shown in Figures 4 and 5, inside the strip 11 constituting the folded outer membrane and pre-assembled in the required form.
  • the folded strip 12 is introduced inside the folded and pre-assembled strip 11, in an arrangement as shown in FIG. 5, that is to say with the zone 11d of the strip 11 opposite. -vis zone 12b of the strip 12.
  • the connection zones 11h and 12h of the strips 11 and 12 respectively are located in corners of the frame located at the ends of a diagonal.
  • the superimposed strips are welded, in particular for fixing the connection zones 11h and 12h against a corner zone located opposite - screw, as shown by the arrows 24.
  • Welding can be electric welding or laser or plasma welding. It is also possible to use a solder as long as it is compatible with the vacuum resistance requirements and the electronic performance to be expected from the cathode ray tube.
  • FIGS. 3A and 3B there is shown respectively a strip 21 constituting a part of an external membrane of a mask mask according to the invention and a cut band 22 constituting a part of an internal membrane of a frame mask mask according to the invention and according to the second embodiment.
  • band 21 To constitute the frame, two bands such as band 21 and two bands such as band 22 are used, which are assembled after folding, as shown in FIG. 6.
  • the strip 21 comprises two successive zones 21a and 21b intended to constitute the outer membrane of a long side and a short side respectively of the mask mask.
  • the strip 22 comprises two successive zones 22a and 22b intended to constitute the internal membranes of a long side and a short side of the frame for a shadow mask.
  • the strips 21 and 22 include corner zones between the zones intended to constitute the membranes on the sides of the frame and a connection area at one of their ends. It is not necessary to describe in detail the strips 21 and 22 which are produced in a similar manner to the strips 11 and 12 and which correspond to one half of these strips in the longitudinal direction.
  • two strips 21 and 21 ′ intended to constitute the external membranes of the frame are used and two strips 22 and 22 ′ intended to constitute the internal membranes.
  • the outer bands 21 and 21 ' are folded and arranged in a template so that the zones of the bands such as 21a and 21b are arranged along the lateral faces of a rectangular parallelepiped.
  • a pre-assembly of the strips 21 and 21 ′ is then carried out along the defined parallelepipedic contour, by welding together tabs or tabs 23 provided along a longitudinal edge of the strip 21 and folded 90 ° inwards.
  • the strips 22 and 22 ' are folded and introduced inside the frame formed by the strips 21 and 21' folded and pre-assembled along a parallelepipedic contour and held inside the template.
  • the strips 22 and 22 ' are introduced, after folding, inside the external frame constituted by the strips 21 and 21', so that their connection end zones 22h and 22'h are located opposite screws of two corner zones of the bands 21 and 21 'respectively and aligned on a diagonal of the contour defined by the bands 21 and 21' pre-assembled different from the diagonal along which the connection zones 21h and 21'h of the bands 21 and 21 'respectively.
  • the strips 21, 21 ′, 22 and 22 ′ are then welded together against each other in the arrangement shown in FIG. 6.
  • FIGS 7A and 7B show a simplified sectional view of the bands constituting respectively the outer membrane and the inner membrane of the frame, during the welding of these bands one on the other, it can be seen that, in the position assembly, the ribs 13 of the external strip 11 (or 21) are directed towards the outside and the ribs 14 of the internal strip 12 (or 22) are directed towards the inside, so that flat connection zones external and internal strips are brought together against each other in their welding position. Welding is carried out in these planar areas, one against the other, inside or outside the frame, as shown by the arrows 26 and 26 '.
  • the external and internal strips do not have to have the same width and the same thickness, these dimensions being able to be adapted as a function of the characteristics sought for the mask mask.
  • the internal membrane must cover the largest possible surface of the external membrane between its upper edge for fixing the shadow mask and its edge cut in the form of a tongue and folded inwards.
  • the internal membrane may or may not have an edge 19 ′ folded inwards superimposed on the edge 19 (or 23) of the external membrane.
  • FIGS. 8A, 8B and 8C an internal membrane 12 has been shown attached and welded to an external membrane 11 and constituting one side of a frame for a shadow mask according to the invention.
  • FIGS. 8A, 8B and 8C differ in the type of welding carried out to connect the two membranes arranged superimposed.
  • the membranes 11 and 12 have reinforcement ribs 13 and 14 respectively which are arranged in directions perpendicular to each other.
  • the membranes 11 and 12 are crossed by openings 17 and 18 at each of the ribs 13 and 14, so that the space between a rib of a membrane projecting inwardly or outwardly and the surface of the other membrane is placed in communication with the outside. This avoids trapping gases inside the walls of the frame, such occluded gases risking disturbing the operation of the cathode ray tube.
  • the membranes 11 and 12 have been welded by welding points 27.
  • the weld points 27 are aligned along the two longitudinal edges of the membranes 11 and 12 and interposed between the ribs 13 and 14.
  • the connection of the two membranes is carried out by continuous welding lines 28.
  • two continuous welding lines 28 are produced along the edges longitudinal of the membranes 11 and 12, weld lines surrounding the reinforcement ribs 13 and 14 and generally closed weld lines between the reinforcement ribs 13 and 14.
  • connection between the membranes 11 and 12 is carried out by distributing a brazing paste in certain zones 29 situated between the membranes 11 and 12 and by wearing the frame pre-assembled at a brazing temperature, inside an oven. The bonding by welding of the two membranes 11 and 12 is thus carried out in the zones 29.
  • the zones 29 are arranged along the longitudinal edges of the membranes 11 and 12 and between the reinforcing ribs 13 and 14.
  • the shadow mask frame 30 is shown in its assembled and welded state.
  • the frame 30 shown in Figure 9 has four flat sides 30a, 30b, 30c and 30d arranged along four side faces of a rectangular parallelepiped.
  • Each of the flat sides of the frame 30 consists of an outer membrane 31 and an inner membrane 32 attached and welded against each other.
  • the outer membranes and the inner membranes on the four sides of the frame can each be made from one or more metal strips.
  • the internal membranes and the external membranes are reinforced by ribs which have directions perpendicular to each other.
  • the frame has a flat corner area 33 to which a device 34 for hanging the frame can be fixed inside the glass envelope of the cathode ray tube.
  • the corner areas 33 of the frame may include through holes allowing the suspension device 34 to be fixed by clipping. It is thus possible achieve effective attachment of suspension devices without the need for welding operations.
  • One of the edges of the frame which will be designated as the upper edge 35, because of its arrangement in FIG. 9, is used to increase the rigidity of the structure.
  • the upper edge 35 of the frame 30 is produced by folding inward or outward one of the longitudinal edges of one of the membranes 31 and 32, preferably the longitudinal edge of the outer membrane 31, or optionally by folding the longitudinal edges disposed opposite the outer membrane 31 and the inner membrane 32. As explained above, the shadow mask is fixed to the frame, along the upper edge of the frame 30.
  • the edge of the outer membrane opposite the edge 35 is also folded inwards to form tongues 36 used in particular for carrying out the pre-assembly of the frame 30. It is also possible to provide folding tongues, at each of the sides of the frame, both with regard to the outer membrane 31 and with respect to the inner membrane 32. In this case, the lower folded edge of the frame 30 is formed by the overlapping tabs welded between them from the outer membrane 31 and the inner membrane 32.
  • the tongues 36 folded towards the inside of the frame may have reinforcing ribs 37.
  • the membranes may have through openings 38 at each of the reinforcing ribs 37.
  • the tongues 36 reinforced by ribs, folded inwards and welded together, constitute a highly rigid assembly on which it is possible to fix the magnetic shielding of the cathode ray tube, for example by clipping.
  • two tongues 36 on two successive sides of the frame 30, for example the sides 30b and 30c are fixed relative to each other by a tongue 36 'cut out, for example, in the lower part of the outer membrane, directly above the corner area 33.
  • the tongue 36 ' is in the folded inward position at 90 °, superimposed on the end parts of the tongues 36 and fixed thereon by welding points 39. This operation is carried out during the pre-assembly of the frame to the inside of a template giving it its shape.
  • FIG 10 there are shown two metal strips 41 and 42 cut and shaped so as to be able to constitute the outer membrane and the inner membrane respectively of a frame for a shadow mask according to the invention.
  • the membranes 41 and 42 are produced in a manner substantially identical to the membranes 11 and 12 shown in FIGS. 2A and 2B respectively.
  • the strips 41 and 42 are cut so as to have zones distributed along the length of the strip intended to constitute the external and internal membranes of the flat sides of a frame, arranged along the lateral faces of a rectangular parallelepiped. These areas are separated by corner areas.
  • the fold lines of the membranes 41 and 42, when the frame is produced, are the lines perpendicular to the longitudinal direction of the corresponding strip separating the corner areas from the areas intended to constitute the sides of the frame.
  • the outer membrane 41 has an edge, called the lower edge, along which are cut tabs 43 which are folded 90 ° towards the inside of the frame, before folding and shaping of the frame.
  • the opposite longitudinal edge of the membrane 41 is folded inward or outward at 90 °.
  • Cutting and inward folding of the edges of the membrane can be performed only for the outer membrane or also on the outer membrane and on the inner membrane as well.
  • connection zone 44 or 45 The metal strips constituting the membranes 41 and 42 are each cut at one of their ends to present a connection zone 44 or 45, these connection zones being attached to one another and welded, after folding of the bands 41 and 42 , when assembling the frame.
  • bands 41 and 42 are formed on each of the zones such as 41a and 42a intended to constitute the outer and inner membranes on one side of the frame, reinforcement grooves, for example by stamping or by burnishing.
  • the strips were folded successively and assembled by welding.
  • the strips are welded to each other in the superposed position by brazing.
  • a solder paste is spread in different zones of one of the bands, for example the band 41 intended to constitute the outer membrane.
  • the solder paste can be distributed in each of the zones intended to constitute a membrane on one side of the frame, as shown in FIG. 8c.
  • solder paste is deposited on the face of the strip 41 opposite the face with respect to which the reinforcing ribs project.
  • the band 41 is superimposed on the band 41 covered with brazing paste, so that the band 42 comes to rest on the band 41 by means of its face opposite to the face with respect to which the ribs project.
  • the strip 42 When the strip 42 is placed on the strip 41, the area 42a is reported on the area 41a, as shown by the arrow 40. In this way, the double strip obtained by superposition of the strips 41 and 42 has at its ends of the two connection zones 44 and 45.
  • connection is made by brazing the strips 41 and 42 by introducing the strips 41 and 42 in the superimposed position in a pass-through oven. At oven temperature, the solder paste ensures the connection by brazing of the two strips 41 and 42 in the superimposed position.
  • the double strip obtained is folded along the transverse lines separating the corner zones from the zones constituting the membranes on the sides of the frame.
  • the frame is then pre-assembled by welding one on the other of the tabs 43 cut in the lower edge of the strip 41 which have been folded inwards.
  • the frame is closed by welding the connection zones 44 and 45 attached to each other.
  • the shape of the frame by folding is imposed and maintained by a template in the shape of a rectangular parallelepiped.
  • a frame 46 comprising two opposite sides 47a and 47b, one of the longitudinal edges of which is cut to have an arc-of-a-circle shape and folded inwards to constitute a rim 48a or 48b of cylindrical shape.
  • the edge 48a on the side 47a and the edge 48b on the side 47b of the frame 46 are carried by the same cylindrical surface with an axis ZZ '.
  • the flanges 48a and 48b allow the fixing by welding to the frame 46, of a perforated mask which is thus arranged and maintained along a cylindrical surface of axis ZZ '.
  • the frame 46 makes it easy to mount a shadow mask of the "stretched mask” type.
  • a force F is exerted on the faces 47a and 47b carrying out a bending of the sides 47a and 47b of the frame towards the inside of the frame and on the faces 47c and 47d a force F 'so that the deformation of the edges 48a and 48b is a translation.
  • the shadow mask is welded to the edges 48a and 48b while maintaining the force ensuring the bending of the sides 47a and 47b of the frame.
  • the frame 46 according to the invention therefore makes it possible to implement in a very simple and rapid manner the taut mask technique, while avoiding the use of a massive, heavy and rigid frame.
  • the frame 46 can also include, along its face opposite the edges 48a and 48b, a rim cut in the form of tongues 50 reinforced by ribs which are folded at 90 ° towards the inside of the frame.
  • the magnetic shielding of the cathode ray tube can be fixed on the reinforced tongues 50 connected to each other by welding.
  • Figure 12 shows a side 51 of a frame according to the invention and according to an alternative embodiment.
  • the sides of the frame such as the side 51 consist of an outer membrane 51a and an inner membrane 51b attached and fixed one against the other.
  • the membranes are not ribbed and are constituted by thin metal strips folded and / or stamped, so as to have plane junction parts coming into contact with one of the other and according to which the membranes are welded.
  • the membranes 51a and 51b can be welded to one another along the upper edge 52 and along the lower edge 53 of the frame.
  • the membranes have stamped zones 54 of substantially square shape pushed inward on the side of the frame coming into contact and welded in pairs during the assembly of the membranes, as can be seen in FIG. 12A (stamped parts 54a and 54b).
  • At least one of the membranes 51a as can be seen in FIG. 12, or the two membranes possibly are pierced with through holes 55 making it possible to avoid trapping gases in the internal space of the wall of the frame.
  • the outer membrane 51a is folded at its upper part and at its lower part to form rims for stiffening and mounting the shadow mask.
  • the frame produced as shown in FIGS. 12, 12A and 12B whose membranes are not ribbed has an overall stiffness in torsion and in bending which is slightly less than the overall rigidity of a frame made from ribbed metal strips, as previously described. There is a change in the amplitude of certain modes of vibration of the frame structure.
  • Good rigidity of the frame structure can be obtained when the contact surface of the two membranes, for example represented by the welded zone 29 in FIG. 8C, is much less than the stamped surface of the membranes along which the membranes are separated. one of the other.
  • the rigidity of the structure can be optimized as a function of the number and the width of ribs produced on the membranes. It is in particular, it is possible to increase the number of ribs as much as the surfaces allow, or to limit the number of ribs and increase the surface of these ribs.
  • the ribs can also communicate with each other to form a single volume.
  • the shadow mask frame according to the invention presents, particularly in the case where the membranes are ribbed, very high mechanical rigidity in bending, in torsion and in tension and compression, in the case of static stresses.
  • the frame according to the invention has a limited sensitivity to external periodic stresses in a frequency range from 100 to 400 Hz.
  • the frame according to the invention also has a structure making it possible to facilitate the mounting of the shadow mask inside the glass envelope of the cathode ray tube, for example by using suspension elements fixed to the frame by clipping and also fixing the magnetic shielding of the cathode ray tube.
  • FIGS 13, 13A and 14 there is shown a suspension element of a new type which can be fixed by clipping into a corner part of a frame according to the invention or of a frame according to art prior.
  • the suspension element generally designated by the reference 55 comprises an upright 56 on which a spring 57 projecting or mounted on an internal side of the upright 56 is produced, a plate d '' hook 58 connected to the upper edge of the upright, in an inclined arrangement relative to the upright and two fixing tabs 59a and 59b connected to the lower edge of the upright, substantially perpendicular to the upright and comprising at their end a lug, respectively 59'a and 59'b .
  • the upright has, along its upper edge, two hooking lugs 60a and 60b.
  • the suspension element 55 can be fixed by clipping onto a wall 62 of a mask frame 61 constituting a corner area of the mask, as shown in FIG. 13.
  • the mask frame is shown with its vertical sides and its rim for fixing the perforated mask, in its upper part.
  • the hooking lugs 60a and 60b are engaged on the upper edge of the corner wall 62 of the mask so that the upright 56 comes to bear on the corner wall 62 via the spring 57.
  • the tongues 59a and 59b are slid under the lower rim 63 of the frame 61 opposite the rim on which the shadow mask is fixed.
  • the spring is compressed and the tongues 59a and 59b are moved under the lower edge 63 of the mask until the pins 59'a and 59'b engage in the openings provided in a desired position through the rim 63.
  • the pins 59'a and 59'b of the tongues 59a and 59b could, as a variant, come to engage, in the position for fixing the suspension element 55, on the inner edge of the rim 63.
  • the suspension element 55 is fixed to the frame 61 by clipping, the spring 57 being compressed against the corner wall 62 of the frame and exerting a pulling force on the tongues 59a and 59b whose pins 59'a and 59'b are engaged in openings or against the internal edge of the rim 63.
  • the suspension element which is also hung on the upper edge of the frame by the legs 60a and 60b is perfectly fixed on the frame.
  • the fixing of the suspension element can be completed by a laser welding point or electric welding.
  • the attachment plate 58 is traversed by an opening 64 which is engaged on a sealed attachment pin 65, in an internal part of the slab of the cathode ray tube, in the vicinity of an angle of the slab.
  • the suspension element 55 can be obtained by cutting and folding a thin metal blade, as shown in FIG. 14 where the cutting lines of the metal strip have been shown in solid lines and the folding lines in dotted lines .
  • the suspension element 55 could also be produced in several parts assembled together by welding.
  • All these steels and alloys have been chosen because they have a high elastic limit and keep their elasticity following the necessary heat treatments, during the manufacture of color television tubes.
  • the alloys used must preferably be non-magnetic.
  • Suspension elements such as the element 55 shown in FIGS. 13 and 13A have the advantage of being able to be fixed on a perforated mask frame without it being necessary to make a connection by resistant welding. Therefore, the suspension elements can be easily disassembled so that it is possible in the event that, during the manufacture of the frame, a check shows that the frame is not in conformity, to recover the frame and / or suspension elements.
  • a seamless fixing of the suspension element on a rigid and light frame makes it possible to avoid deforming the frame, when the element is fixed.
  • suspension element as described above is of a simple and inexpensive embodiment and can be put in place and fixed to the mask frame quickly and easily.
  • the metal strips used to make the membranes constituting the sides of a mask mask according to the invention can be made of low carbon steel such as AK steel, iron-based alloy, iron-nickel alloy such that the Invar with low thermal expansion, in iron-chromium alloy, in nickel-based alloy, in alloy with structural hardening or with hardening of the martensitic type, these alloys making it possible to considerably increase the rigidity of the structure of the frame or made of magnetic alloy, non-magnetic alloy or vibration-absorbing alloy.
  • low carbon steel such as AK steel, iron-based alloy, iron-nickel alloy such that the Invar with low thermal expansion, in iron-chromium alloy, in nickel-based alloy, in alloy with structural hardening or with hardening of the martensitic type, these alloys making it possible to considerably increase the rigidity of the structure of the frame or made of magnetic alloy, non-magnetic alloy or vibration-absorbing alloy.
  • the two membranes can be made of the same metallic material chosen from the materials listed above.
  • the outer membrane and the inner membrane could also be made of different materials, at least one of the materials of the membranes being chosen from the materials listed above.
  • the metal strips used to make the membranes of the frame according to the invention are thin strips the thickness of which is at most equal to 0.1 mm, while the thin frames known from the prior art have a thickness on the order of 0.2 mm.
  • the realization of the frame according to the invention from two superimposed membranes makes it possible to obtain a ten times greater rigidity of the frame with a weight gain of 20% compared to the thin frames known from the prior art.
  • the frame is made so as to allow and facilitate the attachment of the shadow mask.
  • the position of the reinforcing ribs membranes on the sides of the frame is provided to allow the installation and fixing of the shadow mask without difficulty.
  • This fixation of the shadow mask can be carried out by electric welding on the edges of the frame, which corresponds to the known technique.
  • Perforated masks of the "stretched mask” type can be manufactured using a frame whose fixing edges have a cylindrical symmetry.
  • the tensioning of the mask can be carried out by bending on two sides of the frame, as explained above.
  • the reinforcing ribs of the membranes may have a distribution and a shape different from those which have been indicated.
  • the suspension element according to the invention may comprise a single tab and a single attachment tab on the shadow mask frame or even more than two tabs and more than two attachment tabs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
EP97401086A 1996-05-22 1997-05-15 Lochmaskenrahmen einer Kathodenstrahlröhre und Verfahren zu seiner Herstellung Expired - Lifetime EP0809272B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00103229A EP0999571A3 (de) 1996-05-22 1997-05-15 Aufhängungselement für einen Lochmasken-Rahmen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9606366A FR2749104B1 (fr) 1996-05-22 1996-05-22 Cadre de masque perfore d'un tube a rayons cathodiques et procede de fabrication
FR9606366 1996-05-22

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP00103229A Division EP0999571A3 (de) 1996-05-22 1997-05-15 Aufhängungselement für einen Lochmasken-Rahmen

Publications (2)

Publication Number Publication Date
EP0809272A1 true EP0809272A1 (de) 1997-11-26
EP0809272B1 EP0809272B1 (de) 2003-05-02

Family

ID=9492359

Family Applications (2)

Application Number Title Priority Date Filing Date
EP00103229A Withdrawn EP0999571A3 (de) 1996-05-22 1997-05-15 Aufhängungselement für einen Lochmasken-Rahmen
EP97401086A Expired - Lifetime EP0809272B1 (de) 1996-05-22 1997-05-15 Lochmaskenrahmen einer Kathodenstrahlröhre und Verfahren zu seiner Herstellung

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP00103229A Withdrawn EP0999571A3 (de) 1996-05-22 1997-05-15 Aufhängungselement für einen Lochmasken-Rahmen

Country Status (15)

Country Link
US (1) US5898259A (de)
EP (2) EP0999571A3 (de)
JP (1) JP3704545B2 (de)
KR (1) KR100449785B1 (de)
CN (1) CN1088907C (de)
AT (1) ATE239301T1 (de)
BR (1) BR9709344A (de)
CA (1) CA2255568A1 (de)
DE (1) DE69721375T2 (de)
FR (1) FR2749104B1 (de)
HU (1) HUP9902464A3 (de)
PL (1) PL330077A1 (de)
RU (1) RU2184405C2 (de)
TW (1) TW428195B (de)
WO (1) WO1997044806A1 (de)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2000033348A1 (en) * 1998-11-27 2000-06-08 Koninklijke Philips Electronics N.V. A colour selection means for a cathode ray tube comprising a tension mask
FR2790140A1 (fr) * 1999-02-19 2000-08-25 Imphy Ugine Precision Cadre support de masque d'ombre de tube de visualisation cathodique

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US6188170B1 (en) * 1996-07-12 2001-02-13 Kabushiki Kaisha Toshiba Color cathode ray tube including mask frame with protruding portions
KR100234168B1 (ko) * 1997-06-28 1999-12-15 손욱 칼라 음극선관용 인너실드
US6046535A (en) * 1997-07-30 2000-04-04 Samsung Display Devices Co., Ltd. Shadow mask frame assembly for a cathode ray tube
KR100243255B1 (ko) * 1997-12-15 2000-02-01 손욱 새도우 마스크 지지체
US6817919B1 (en) * 1999-09-03 2004-11-16 Matsushita Electric Industrial Co., Ltd. Method and apparatus for manufacturing a frame work for shadow mask
KR100388903B1 (ko) 1999-12-10 2003-06-25 삼성에스디아이 주식회사 평면형 음극선관용 섀도우마스크 프레임 조립체
JP2001185043A (ja) * 1999-12-28 2001-07-06 Matsushita Electric Ind Co Ltd 陰極線管
KR100708633B1 (ko) * 2000-04-10 2007-04-17 삼성에스디아이 주식회사 음극선관의 새도우 마스크 프레임
KR100683647B1 (ko) 2000-04-21 2007-02-15 삼성에스디아이 주식회사 칼라 음극선관의 텐션 마스크 프레임 조립체
KR100339364B1 (ko) * 2000-05-17 2002-06-03 구자홍 인장 마스크 어셈블리
US6601086B1 (en) * 2000-06-06 2003-07-29 Emware, Inc. Service provider for providing data, applications and services to embedded devices and for facilitating control and monitoring of embedded devices
TW503426B (en) * 2000-06-27 2002-09-21 Koninkl Philips Electronics Nv Colour display tube provided with a colour selection electrode
KR100778397B1 (ko) * 2000-12-08 2007-11-21 삼성에스디아이 주식회사 음극선관의 색 선별 장치
JP2004531039A (ja) * 2001-06-21 2004-10-07 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ 色選択電極が設けられたカラー表示管
US6597095B2 (en) * 2001-11-20 2003-07-22 Thomson Licensing S. A. Cathode ray tube mask frame assembly
KR20040017092A (ko) * 2002-08-20 2004-02-26 삼성에스디아이 주식회사 칼라 음극선관용 텐션마스크 프레임 조립체
CN106319192A (zh) * 2015-06-16 2017-01-11 丹阳市凯鑫合金材料有限公司 殷钢冷镦热轧线材盘圆的生产方法
CN108004504B (zh) * 2018-01-02 2019-06-14 京东方科技集团股份有限公司 一种掩膜板
US10886452B2 (en) * 2018-01-25 2021-01-05 United States Of America As Represented By The Administrator Of Nasa Selective and direct deposition technique for streamlined CMOS processing

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FR2184899A1 (de) * 1972-05-17 1973-12-28 Rca Corp
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US5072150A (en) * 1988-10-25 1991-12-10 Samsung Electron Devices Co., Ltd. Shadow mask assembly for color picture tube

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US5274302A (en) * 1991-10-21 1993-12-28 Zenith Electronics Corporation Stress transparent tension mask frame member for reducing slurry particle agglutination
KR100336545B1 (ko) * 1993-07-02 2002-11-11 코닌클리케 필립스 일렉트로닉스 엔.브이. 차폐기-애노드코팅부접촉기를구비한음극선관

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FR2184899A1 (de) * 1972-05-17 1973-12-28 Rca Corp
GB2097996A (en) * 1981-05-04 1982-11-10 Philips Nv Shadow mask support arrangement for a colour display tube
US5072150A (en) * 1988-10-25 1991-12-10 Samsung Electron Devices Co., Ltd. Shadow mask assembly for color picture tube

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000033348A1 (en) * 1998-11-27 2000-06-08 Koninklijke Philips Electronics N.V. A colour selection means for a cathode ray tube comprising a tension mask
FR2790140A1 (fr) * 1999-02-19 2000-08-25 Imphy Ugine Precision Cadre support de masque d'ombre de tube de visualisation cathodique
EP1032016A1 (de) * 1999-02-19 2000-08-30 Imphy Ugine Precision Tragrahmen für eine Schattenmaske einer Kathodenstrahlröhrenanzeige
WO2000051157A1 (fr) * 1999-02-19 2000-08-31 Imphy Ugine Precision Cadre support de masque d'ombre de tube de visualisation cathodique
US6528933B1 (en) 1999-02-19 2003-03-04 Imphy Ugine Precision Shadow mask support frame for a cathode-ray display tube

Also Published As

Publication number Publication date
EP0999571A2 (de) 2000-05-10
CA2255568A1 (fr) 1997-11-27
CN1169585A (zh) 1998-01-07
EP0809272B1 (de) 2003-05-02
PL330077A1 (en) 1999-04-26
WO1997044806A1 (fr) 1997-11-27
ATE239301T1 (de) 2003-05-15
DE69721375T2 (de) 2004-03-25
FR2749104A1 (fr) 1997-11-28
HUP9902464A2 (hu) 1999-11-29
BR9709344A (pt) 1999-08-10
KR970076967A (ko) 1997-12-12
HUP9902464A3 (en) 2002-02-28
CN1088907C (zh) 2002-08-07
US5898259A (en) 1999-04-27
DE69721375D1 (de) 2003-06-05
JP2000509550A (ja) 2000-07-25
TW428195B (en) 2001-04-01
EP0999571A3 (de) 2002-01-02
FR2749104B1 (fr) 1998-08-28
JP3704545B2 (ja) 2005-10-12
RU2184405C2 (ru) 2002-06-27
KR100449785B1 (ko) 2004-12-03

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