EP0809272B1 - Lochmaskenrahmen einer Kathodenstrahlröhre und Verfahren zu seiner Herstellung - Google Patents

Lochmaskenrahmen einer Kathodenstrahlröhre und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0809272B1
EP0809272B1 EP97401086A EP97401086A EP0809272B1 EP 0809272 B1 EP0809272 B1 EP 0809272B1 EP 97401086 A EP97401086 A EP 97401086A EP 97401086 A EP97401086 A EP 97401086A EP 0809272 B1 EP0809272 B1 EP 0809272B1
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EP
European Patent Office
Prior art keywords
frame
membrane
membranes
alloy
shadow mask
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97401086A
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English (en)
French (fr)
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EP0809272A1 (de
Inventor
Jean-Pierre Reyal
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Aperam Stainless Precision SAS
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Imphy Ugine Precision SA
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Filing date
Publication date
Application filed by Imphy Ugine Precision SA filed Critical Imphy Ugine Precision 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 shadow mask frame a cathode ray tube and in particular a tube of color television.
  • Color television tubes with shadow mask have a glass envelope in which are fixed metal parts of which one is made by the perforated screen secured to a frame and another by a magnetic shield placed inside the envelope of glass.
  • the glass envelope consists of two parts, a slab including the screen on which is formed the image and a cone on which are fixed the electron guns and the deflection coils of electron beams from the cathode ray tube.
  • the shadow mask is made from a thin metal strip in which small holes dimensions and adapted shape are produced by machining chemical.
  • the metal bands used are generally low carbon steel or iron-nickel alloy such than Invar.
  • the shadow mask is shaped by stamping hot or cold, so as to present a peripheral edge along which a frame is welded metallic.
  • the set consisting of the frame and the mask is fixed inside the glass slab, via suspension devices attached to the frame and coming to engage on pawns 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 pawns of fixing sealed in the glass of the slab.
  • cathode ray tubes of different types which are distinguished in particular by the type of mask or the type of frame used or again by the method of hanging the frame inside the glass envelope of the tube.
  • thin frames and light whose thickness can be for example of 0.2 mm and thick, rigid and heavy frames.
  • the suspension of the shadow mask, via of its frame, inside the envelope of Glass of the tube must allow to fulfill several functions.
  • this suspension must allow control the relative movements of the glass screen and of the shadow mask which are caused in particular by dilation of the shadow mask which heats up under impact of the electron beam, so as to maintain the color purity of the image formed on the screen.
  • the suspension devices must keep the shadow mask in position inside of the glass envelope, even when the tube to cathode rays receives a shock, and protect the mask perforated against external mechanical stress.
  • suspension systems must allow dismantle or move the mask while manufacturing the cathode ray tube and then replace inside the glass envelope, as many times as it may be necessary.
  • the thick frames known from the prior art are often too heavy which can be for example of the order of or greater than 2 kg, in the case of so-called "stretched mask” technologies, the mask perforated being tensioned on the frame whose rigidity must be sufficient to withstand the stresses resulting from the tensioning of the mask.
  • These thin frames have the advantage of having a low thermal inertia but are very large fragility, due to their small thickness. These frames also have insufficient rigidity. Therefore, it may be necessary to weld hangers on the fixing pins to avoid dropping out of the frame. The manufacturing 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 a color television tube having flat sides arranged substantially along lateral faces with a straight prismatic surface and having a stiffening edge for fixing the shadow mask on the frame through which the shadow mask is placed inside a glass envelope cathode ray tube which has a cone and a slab comprising a screen, this frame having good mechanical rigidity, the lowest possible weight, for a given rigidity, a low thermal inertia and other benefits, such as limited sensitivity to external periodic stresses, in a range frequency ranging for example from 100 to 400 Hz.
  • the flat sides of the frame have an external membrane and an internal membrane added and fixed one against the other and each constituted by a portion of thin metal strip.
  • a shadow mask frame according to the present invention is defined in claim 1.
  • a method of manufacturing a mask frame perforated according to the present invention is defined in claim 19.
  • At least one of the outer membranes and internal is reinforced by at least a stamped part of the membrane.
  • one of the membranes, or both membranes are reinforced by ribs.
  • Figure 1 is an exploded perspective view a cathode ray tube with a shadow mask.
  • Figures 2A and 2B are plan views of metal strips cut before shaping, of so as to constitute an outer membrane and a membrane internal respectively of a mask mask according to the invention and according to a first embodiment.
  • Figures 3A and 3B are plan views of cut and shaped metal strips, of so as to constitute an outer membrane and a membrane internal respectively, of a mask mask according to the invention and according to a second embodiment.
  • Figure 4 is an exploded perspective view showing the folding formatting and assembly of two metal bands as shown on the Figures 2A and 2B, when making a frame shadow mask according to the invention and according to the first embodiment.
  • Figure 5 is a top view of the bands shown in Figure 4, in their assembly position before welding.
  • Figure 6 is a top view, similar to the view of FIG. 5, showing strips of sheet metal such 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 of Figure 6 showing an outer membrane and a membrane internal of a shadow mask frame according to the invention in their assembly position as well as part of a mask in assembly position on the frame.
  • Figures 8A, 8B and 8C are plan views showing the welding areas of an internal membrane and an outer membrane of a shadow mask frame according to the invention, attached and fixed one against the other.
  • Figure 9A is a perspective view of a mask mask according to the invention in the assembled state.
  • Figure 9B is a top view of an area angle of the frame shown in Figure 9A.
  • Figure 9C is an elevation view of the area angle of the frame shown in Figure 9B.
  • Figure 10 is a plan view of a membrane outer and inner membrane of a mask frame perforated 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 mask mask according to the invention allowing to implement "stretch mask” technology.
  • Figure 12A is a perspective view of a part of one side of a shadow mask frame next the invention and according to an alternative embodiment.
  • Figure 12B is a sectional view along 12B-12B in Figure 12.
  • Figure 12C is a sectional view along 12C-12C in Figure 12.
  • the cathode ray tube designated in its together by mark 1, has a glass envelope consisting of a cone 2 and a slab 3 and two pieces metal 4 and 9 which are attached inside of the glass envelope of the tube.
  • Part 4 is a pre-assembled assembly comprising the shadow mask 5 consisting of a metal sheet crossed by openings 6, the frame 7 of the mask perforated and assembly suspension devices 8 4 inside the slab 3 of the glass envelope.
  • Part 9 is a shaped metal wall so as to constitute an internal magnetic shielding engaged in cone 2 of the glass casing, the most often attached to the frame.
  • the cone 2 of the glass envelope has a rectangular base with rounded corners and a curved wall having a shape close to that of a cone whose section decreases towards the posterior end cathode ray tube 1 at which are attached to the cone 2 the electron guns and the coils of deviation of the cathode ray tube.
  • Slab 3 has a slightly curved wall 3a constituting the screen of the cathode ray tube and a ledge 3b including rectangular base with rounded angles can be perfectly superimposed with the base of the cone 2.
  • pawns such as 10 projecting inward allowing the attachment of the assembly 4 comprising the shadow mask 5 and the frame 7, via of suspension devices 8 fixed on the edges of the frame 7.
  • the cathode ray tube 1 shown in FIG. 1 is of the type comprising pawns of fixing 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.
  • the constituent parts of the tube 1 have been represented before their assembly to constitute the cathode ray tube.
  • the shadow mask 5 is made from a thin strip in which holes 6 are made by machining chemical.
  • the perforated sheet is then shaped by hot or cold stamping to form a mask 5 comprising a peripheral assembly rim substantially rectangular in shape with rounded corners.
  • the magnetic shield 9 is then fixed, by example by clipping, on frame 7. In certain modes of realization, it is necessary to fix the shielding on the pins sealed on the inner 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 devices according to the prior art.
  • FIGS. 2A and 2B there is shown, respectively, an outer membrane 11 and a membrane interior 12 of a shadow mask frame according to the invention.
  • the membranes 11 and 12 are made from of a strip of thin sheet or strip of material metallic, such as steel, iron-nickel alloy or another alloy.
  • the strip of thin metal sheet is cut out following an external contour allowing to delimit four zones 11a, 11b, 11c, 11d or 12a, 12b, 12c, 12d depending on the length of the strip, intended to constitute the membrane outer and inner membrane, respectively, of each sides of the mask mask, during assembly bands 11 and 12 to make a frame whose flat sides are arranged along the side faces of a rectangular parallelepiped.
  • Zones 11b and 11d on the one hand and 12b and 12d on the other hand bands 11 and 12 respectively are of identical form and are intended to constitute the membranes on the short sides of the frame.
  • zones are provided angle or connection 11e, 11f, 11g and 11h for the band 11 or 12e, 12f, 12g and 12h for band 12.
  • the metal strip is shaped, for example by stamping or burnishing, to present ribs of reinforcement parallel to each other.
  • the successive zones of the strip 11 intended for constitute the outer membranes of the frame include ribs 13 parallel to the longitudinal edges of the bandaged.
  • the zones of the strip 12 intended to constitute the inner membranes on the sides of the frame have ribs 14 perpendicular to the longitudinal edges of the band.
  • ribs reinforcement parallel to the longitudinal edges tape in the areas intended to constitute a membrane of a large or a small side of the frame and reinforcement ribs perpendicular to the edges longitudinal of the strip in the areas intended for form a membrane on the other sides of the frame. So, the same strip may comprise in successive zones, longitudinal direction ribs and ribs perpendicular to the longitudinal direction.
  • the sheets 11 or 12 are drilled, at the level of each of the ribs 13, 15, 14 and 16, of holes 17 or 18 crossing the strip over its entire thickness, so to avoid trapping gases between the internal membranes and external of the sides of the frame, when the membranes are brought together and welded together, as will be described below.
  • At least one of the two bands (the band external 11 in the case of the embodiment shown in FIGS. 2A and 2B) comprises, according to one of its edges, tabs 19 at each of the successive zones constituting a membrane of a wall of the frame and at the corner and connection areas.
  • FIG. 7B It is also visible in FIG. 7B that a part 20 of the upper edge of the strip 11, of a width lower than the lower edge 19, is also folded inward at 90 °, which contributes to stiffening of the frame.
  • the shadow mask 5 is attached and welded along the upper edge 20 of the frame.
  • the shadow mask has been represented 5 in the assembly position.
  • the rim 5a of the mask 5 is fitted against the upper part of the membrane outside of the frame, along the edge 20 folded inwards of the frame.
  • the welding of the mask is carried out by the outside of the frame, as shown by arrow 51.
  • FIG. 7C a variant of creation of the mask frame and method of attachment perforated 5.
  • the edge 20 of the outer membrane of the frame is folded out of the frame and the rim 5a of the mask 5 is fitted against the internal membrane of the frame on along edge 20. Welding can be done from the outside (arrow 51) or from inside the frame (arrow 51 '). Alternatively, the stiffening edge 20 could be achieved by folding the top edge of the internal membrane outwards above the membrane outer and the rim 5a of the mask 5 welded to the internal membrane.
  • FIG. 7D the case of a frame with stretched mask.
  • the edge 20 and the mask 5 have the shape of cylinder portions to circular section.
  • Mask 5 is attached to the edge 20 and fixed to edge 20 by welding.
  • the inner membrane of the frame may have also a flange 19 'folded 90 ° inwards and superimposed on the edge 19 of the outer membrane.
  • the assembly is carried out and forming the frame.
  • the assembly by welding of the outer and inner membranes of the frame is made after folding of the strips 11 and 12 constituting these membranes.
  • the assembly by welding outer and inner membranes of the frame in positions can be superimposed before folding the membranes.
  • a part of the edge of the strip 11 is folded intended to constitute the external membrane, located opposite lugs 19, to constitute the stiffening rim 20 along which the shadow mask is attached.
  • Corresponding legs 19 ' can be provided on the strip constituting the internal membrane 12, these legs 19 'are also folded inwards at 90 °.
  • the band 11 constituting is folded the outer membrane, as shown in Figure 4, the along the edges perpendicular to the longitudinal edges of the strip delimiting the corner areas 11e, 11f, 11g and the connection area llh.
  • We assure then maintaining the external strip 11 in the form given by the template, by welding one on the other of tabs 19 constituting one of the folded edges of the strip then we introduce the strip 12, after folding, as shown in Figures 4 and 5, inside the strip 11 constituting the folded and pre-assembled outer membrane according to the required form.
  • the folded strip 12 is introduced inside the strip 11 folded and pre-assembled, in a layout as shown in Figure 5, i.e. with zone 11d of strip 11 opposite zone 12b of the strip 12.
  • the connection zones 11h and 12h of bands 11 and 12 respectively are in corners of the frame located at the ends of a diagonal.
  • Welding can be electric welding or a laser or plasma welding. We can also use solder as long as it is compatible with vacuum resistance and performance requirements to be expected from the cathode ray tube.
  • FIGS 3A and 3B there is shown respectively a strip 21 constituting part of a membrane outer of a shadow mask frame according to the invention and a cut strip 22 constituting a part an inner membrane of a mask mask according to the invention and according to the second embodiment.
  • the strip 21 has two successive zones 21a and 21b intended to constitute the outer membrane of a large side and a small side respectively of the frame of shadow mask.
  • the strip 22 comprises two successive zones 22a and 22b intended to constitute the membranes internals on one large side and one small side of the frame for shadow mask.
  • the bands 21 and 22 have corner zones between the zones intended to form the membranes on the sides of the frame and a connection zone at one of their ends. he it is not necessary to describe in detail the bands 21 and 22 which are produced analogously to the bands 11 and 12 and which correspond to half of these bands in the longitudinal direction.
  • the outer bands 21 and 21 ' are folded and arranged in a template so that the areas of bands such as 21a and 21b are arranged according to the lateral faces of a rectangular parallelepiped.
  • the strips 22 and 22 ' are folded and inserted inside the frame formed by the bands 21 and 21 ' folded and pre-assembled in a parallelepiped shape and kept inside the template.
  • the bands 22 and 22 ' are introduced, after folding, inside the external frame formed by bands 21 and 21 ', so that their end zones 22h and 22h connection are located opposite of two corner zones of the bands 21 and 21 'respectively and aligned on a diagonal of the outline defined by the bands 21 and 21 'pre-assembled different from the diagonal according to which the connection zones are aligned 9 p.m. and 9 p.m. of bands 21 and 21 'respectively.
  • the strips 21, 21 ′ are then welded, 22 and 22 'reported against each other in the provision shown in Figure 6.
  • FIGS 7A and 7B which represent a simplified sectional view of the constituent bands respectively the outer membrane and the inner membrane of the frame, during the welding of these strips one on the other, we see that, in the assembly position, the ribs 13 of the outer strip 11 (or 21) are directed outwards and the ribs 14 of the internal strip 12 (or 22) are directed inwards, so that flat areas for connecting the external strips and internal are reported against each other in their welding position. Welding is carried out in these areas planes brought together against each other, from the inside or outside the frame, as shown by the arrows 26 and 26 '.
  • the external tapes and internal have the same width and the same thickness, these dimensions can be adapted according to characteristics sought for the mask frame perforated.
  • the internal membrane must cover the largest possible surface of the outer 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 edge 19 (or 23) of the outer membrane.
  • FIGS. 8A, 8B and 8C there is shown a internal membrane 12 attached and welded to a membrane external 11 and constituting one side of a mask frame perforated according to the invention.
  • the embodiments illustrated by the figures 8A, 8B and 8C differ in the type of welding performed to connect the two membranes arranged so superimposed.
  • the membranes 11 and 12 have ribs of reinforcement 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, of so that the space between a rib of a membrane projecting inward or outward and the surface of the other membrane is put in communication with the outside. This avoids trapping gases inside the walls of the frame, such occluded gases risking disturbing the operation of the spoke tube cathode.
  • 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 lines continuous welding 28.
  • lines continuous welding 28 along the longitudinal edges membranes 11 and 12, welding lines surrounding the reinforcing ribs 13 and 14 and generally closed welding lines between the ribs reinforcement 13 and 14.
  • connection between the membranes 11 and 12 is made by distributing a solder paste in certain zones 29 located between membranes 11 and 12 and while wearing the frame pre-assembled at a brazing temperature, inside an oven.
  • the connection is thus made by brazing of the two membranes 11 and 12, in zones 29.
  • the zones 29 are arranged according to the longitudinal edges of the membranes 11 and 12 and between the reinforcing ribs 13 and 14.
  • the frame 30 shown in Figure 9 includes 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 is constituted an outer membrane 31 and an inner membrane 32 attached and welded together.
  • the outer membranes and the inner membranes each of the four sides of the frame can be made from one or more metal strips.
  • Membranes internal and external membranes are reinforced by ribs which have perpendicular directions between them.
  • the frame has a flat corner area 33 on which can be fixed a device 34 for hanging the frame inside of the glass envelope of the cathode ray tube.
  • the corner areas 33 of the frame may include through holes for fixing by clipping of the suspension device 34. It is thus possible achieve effective attachment of suspension devices without resorting to welding operations.
  • Mon edges of the frame which will be designated as the top edge 35, due to its arrangement in FIG. 9, is used to increase the rigidity of the structure.
  • the edge upper 35 of frame 30 is made by folding towards inside or outside one of the longitudinal edges of one of the membranes 31 and 32, preferably the edge longitudinal of the outer membrane 31, or possibly by folding the longitudinal edges arranged opposite of the outer membrane 31 and the inner membrane 32. As explained above, the shadow mask is fixed on the frame, along the upper edge of the frame 30.
  • the edge of the outer membrane opposite edge 35 is also folded inwards to constitute tabs 36 used in particular for carrying out the pre-assembly of the frame 30. It is also possible to provide tabs foldable, on each side of the frame, both with respect to the outer membrane 31 as for the inner membrane 32. In this case, the lower folded edge of the frame 30 is constituted by the tabs superimposed and welded together the outer membrane 31 and the inner membrane 32.
  • the tabs 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 between them, constitute a set of great rigidity 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 one by compared to the other by a cut tab 36 ', by example, in the lower part of the outer membrane, directly above corner area 33.
  • the tongue 36 ' is in the folded position towards inside at 90 °, superimposed on the end parts of the tabs 36 and fixed thereon by points of welding 39. This operation is carried out during pre-assembly the frame inside a template giving its shape.
  • the membranes 41 and 42 are made of a substantially identical to membranes 11 and 12 shown in Figures 2A and 2B respectively.
  • bands 41 and 42 are cut from so as to present zones distributed according to the length of the strip intended to constitute the membranes external and internal of the flat sides of a frame, arranged along the side faces of a parallelepiped rectangle. These areas are separated by corner areas.
  • the fold lines of the membranes 41 and 42, during the realization of the frame 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 lower edge, along which tabs are cut 43 which are folded 90 ° towards the inside of the frame, before folding and shaping the frame.
  • the opposite longitudinal edge of the membrane 41 is folded in or out at 90 °.
  • Cutting and folding inward of edges of the membrane can be made only for the outer membrane or on the membrane external and also on the internal membrane.
  • connection zones 44 and 45 are each cut at one of their ends to present a connection zone 44 or 45, these connection zones being attached to each other and welded, after folding strips 41 and 42, when of the frame assembly.
  • membranes 41 and 42 from metal strips are made in the same way as in the case of the first embodiment.
  • the strips are welded one on the other in a position superimposed by brazing.
  • solder paste can be distributed in each zones intended to constitute a membrane of one of the sides of the frame, as shown in Figure 8c.
  • solder paste is placed on the face of the strip 41 opposite the face with respect to which the reinforcing ribs protrude.
  • the frame is closed by welding the connection zones 44 and 45 reported one on the other.
  • the shape of the frame by folding is imposed and maintained by a parallelepiped-shaped template rectangle.
  • FIG 11 there is shown a frame 46 according to the invention comprising two opposite sides 47a and 47b of which one of the longitudinal edges is cut to present an arc-shaped shape and folded towards the inside to form a 48a or 48b ledge of shape cylindrical.
  • Edge 48a on side 47a and edge 48b of side 47b of the frame 46 are carried by the same surface cylindrical with axis ZZ '.
  • Edges 48a and 48b allow fixing by welding on the frame 46, of a perforated mask which thus found arranged and maintained along a surface cylindrical with axis ZZ '.
  • the frame 46 makes it easy to carry out the mounting of a shadow mask of the "stretched mask” type.
  • a force F is exerted on the faces 47a and 47b realizing bending of the sides 47a and 47b of the frame towards inside the frame and on the faces 47c and 47d a force F 'in such a way that the deformation of the edges 48a and 48b is a translation.
  • the frame 46 according to the invention therefore makes it possible to very quickly and easily implement the stretch mask technique, avoiding the use of a frame massive, heavy and rigid.
  • the frame 46 may also include, along its face opposite edges 48a and 48b, a cut edge in the form of tongues 50 reinforced with ribs which are folded 90 ° towards the inside of the frame.
  • the magnetic shielding of the cathode ray tube may be fixed on the reinforced tabs 50 connected between them by welding.
  • Figure 12 shows a side 51 of a following frame the invention and according to an alternative embodiment.
  • the sides of the frame such as side 51 are consisting of an outer membrane 51a and a membrane internal 51b reported and fixed one against the other.
  • the membranes are not ribbed and are formed by folded thin metal strips and / or stamped, so as to present parts of plane junction coming into contact with each other and according to which the membranes are welded.
  • the membranes 51a and 51b can be welded to each other the other along the upper edge 52 and along the edge lower 53 of the frame.
  • the membranes include stamped areas 54 of substantially square shape repelled inward on the side of the frame coming in contact and welded two by two when assembling the membranes, as seen in Figure 12A (parts stamped 54a and 54b).
  • At least one of the membranes 51a, as it is visible in Figure 12, or the two membranes if necessary are pierced with through holes 55 allowing avoid trapping gases in the internal space of the frame wall.
  • the outer membrane 51a is folded at its upper part and at its lower part to constitute stiffening and mounting edges of the shadow mask.
  • the frame produced as shown in the figures 12, 12A and 12B whose membranes are not ribbed has overall torsional and bending stiffness which is slightly less than the overall stiffness of a frame made from ribbed metal strips, as previously described. We observe a modification of the amplitude of certain modes of vibration of the structure of the frame.
  • the ribs can also communicate with each other to form a single volume.
  • the shadow mask frame according to the invention whose flat sides consist of two membranes welded together, especially in the case where the membranes are ribbed, a very large mechanical rigidity in bending, torsion and tension and compression, in the case of static stresses.
  • the frame according to the invention has a limited sensitivity to external periodic requests in a range of frequencies from 100 to 400 Hz.
  • the framework according to the invention also has a structure to facilitate assembly of the perforated mask inside the glass envelope of the cathode ray tube, for example using suspension elements fixed to the frame by clipping and also the fixing of the magnetic shielding of the tube cathode.
  • the metal bands used to make the membranes constituting the sides of a mask frame perforated according to the invention can be made of low steel carbon such as AK steel, an iron-based alloy, iron-nickel alloy such as Invar at low thermal expansion, iron-chromium alloy, alloy nickel-based, structural hardening alloy or hardening of the martensitic type, these alloys allowing to considerably increase the rigidity of the structure of the frame or of magnetic alloy, non-magnetic alloy or alloy damping the vibration.
  • the two membranes can be of the same material metallic chosen from the materials listed above.
  • the outer membrane and the inner membrane could also be in different materials, at least one of the materials of the membranes being chosen among the materials listed above.
  • the metal strips used to make the frame membranes according to the invention are thin strips the thickness of which is more equal to 0.1 mm, while the known thin frames of the prior art have a thickness of the order of 0.2 mm.
  • the realization of the frame according to the invention from two superimposed membranes provides rigidity ten times stronger from the frame with weight gain 20% compared to the thin frames known in the art earlier.
  • 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 fitting and fixing 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 mask can be tensioned by bending on two sides of the frame, as it was explained above.
  • the reinforcing ribs of the membranes can have a different distribution and shape of those that have been indicated.

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  • 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)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Cell Electrode Carriers And Collectors (AREA)

Claims (25)

  1. Rahmen einer Lochmaske einer Kathodenstrahlröhre, insbesondere einer Röhre für einen Farbfernseher, wobei dieser Rahmen flache Ränder (30a, 30b, 30c, 30d, 51) aufweist, die an den Seitenflächen einer geraden prismatischen Fläche angeordnet sind und einen Versteifungsrand (20, 48a, 48b) für die Befestigung einer Lochmaske (5) an dem Rahmen (7, 30) enthält, mit dessen Hilfe die Lochmaske (5) im Inneren einer Glashülle einer Kathodenstrahlröhre angeordnet wird, welche einen Konus (2) und eine Platte (3) mit einem Schirm (3a) aufweist,
    dadurch gekennzeichnet, dass
    die Ränder (30a, 30b, 30c, 30d, 51) des Rahmens (30) eine äußere Membran (11, 21, 21', 31, 41, 51a) und eine innere Membran (12, 22, 22', 32, 42, 51b) aufweisen, die aneinander angesetzt und miteinander befestigt sind und jeweils aus einem dünnen Metallstreifen bestehen.
  2. Rahmen nach Anspruch 1,
    dadurch gekennzeichnet, dass
    mindestens eine der äußeren Membranen (11, 21, 21', 31, 41, 51a) und der inneren Membranen (12, 22, 22', 32, 42, 51b) mit Hilfe von mindestens einem tiefgezogenen Abschnitt der Membran verstärkt ist.
  3. Rahmen nach Anspruch 2,
    dadurch gekennzeichnet, dass
    mindestens eine der Membranen mit Hilfe von Rippen (13,14) verstärkt ist.
  4. Rahmen nach Anspruch 3,
    dadurch gekennzeichnet, dass
    die äußere Membran (11, 21, 21', 31, 41, 51a) und die innere Membran (12, 22, 22', 32, 42, 51b) mit Hilfe von Rippen verstärkt sind und dass die Rippen (13) der äußeren Membran (1, 21, 21', 31, 41) in senkrechter Richtung zu der Richtung der Rippen (14) der inneren Membran (12, 22, 22', 32, 42) verlaufen.
  5. Rahmen nach Anspruch 3,
    dadurch gekennzeichnet, dass
    mindestens eine Membran Rippen aufweist, die in zwei senkrecht zueinander liegenden Richtungen angeordnet sind.
  6. Rahmen nach einem der Ansprüche 2,3 und 4,
    dadurch gekennzeichnet, dass
    die innere Membran (11, 21, 21', 31, 41) und die äußere Membran (12, 22, 22', 32, 42) an den tiefgezogenen Abschnitten oder Versteifungsrippen (13, 14) von mindestens einer Bohrung (17, 18, 55) durchquert werden.
  7. Rahmen nach einem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet, dass
    die äußere Membran (11, 21, 21', 31, 41) und die innere Membran (12, 22, 22', 32, 42) mit Hilfe von Schweißpunkten aneinander befestigt sind.
  8. Rahmen nach einem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet, dass
    die äußere Membran (11, 21, 21', 31, 41) und die innere Membran (12, 22, 22', 32, 42) mit Hilfe von kontinuierlichen Schweißnähten (28) miteinander verbunden sind.
  9. Rahmen nach einem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet, dass
    die äußere Membran (11, 21, 21', 31, 41) und die innere Membran (12, 22, 22', 32, 42) mit Hilfe eines Lötmaterials miteinander verbunden sind, welches in Bereichen (29) zwischen den Membranen aufgebracht ist.
  10. Rahmen nach einem der Ansprüche 1 bis 9,
    dadurch gekennzeichnet, dass
    die äußere Membran (11, 21, 21', 31, 41) und die innere Membran (12, 22, 22', 32, 42) aus demselben metallischen Material hergestellt sind.
  11. Rahmen nach Anspruch 10,
    dadurch gekennzeichnet, dass
    das metallische Material aus der Gruppe ausgewählt wird, die folgende Werkstoffe umfasst: einen Stahl mit einem geringen Kohlenstoffgehalt, eine Legierung auf der Basis von Eisen, eine Eisen-Nickel-Legierung, eine Eisen-Chrom-Legierung, eine Legierung auf der Basis von Nickel, eine strukturell gehärtete Legierung, eine martensitisch gehärtete Legierung, eine Vibrationen amortisierende Legierung.
  12. Rahmen nach einem der Ansprüche 1 bis 9,
    dadurch gekennzeichnet, dass
    die äußere Membran (11, 21, 21', 31, 41) und die innere Membran (12, 22, 22', 32, 42) aus unterschiedlichen Werkstoffen hergestellt werden.
  13. Rahmen nach Anspruch 12,
    dadurch gekennzeichnet, dass
    mindestens einer der Werkstoffe, aus denen die äußere Membran (11, 21, 21', 31, 41) und die innere Membran (12, 22, 22', 32, 42) hergestellt werden, aus der Gruppe ausgewählt wird, der folgende Werkstoffe umfasst: einen Stahl mit einem geringen Kohlenstoffgehalt, eine Legierung auf der Basis von Eisen, eine Eisen-Nickel-Legierung, eine Eisen-Chrom-Legierung, eine Legierung auf der Basis von Nickel, eine strukturell gehärtete Legierung, eine martensitisch gehärtete Legierung, eine magnetische Legierung, eine nicht magnetische Legierung, eine Vibrationen amortisierende Legierung.
  14. Rahmen nach einem der Ansprüche 1 bis 13,
    dadurch gekennzeichnet, dass
    er Winkelbereiche (33) aufweist, die zwischen den aufeinanderfolgenden Rändern (30a, 30b, 30c, 30d) des Rahmens weitgehend flach sind.
  15. Rahmen nach Anspruch 14,
    dadurch gekennzeichnet, dass
    eine Vorrichtung (34) für die Aufhängung des Rahmens in der Glashülle der Kathodenstrahlröhre in mindestens eine Bohrung eingeklemmt wird, die in die Winkelbereiche (33) eingearbeitet ist.
  16. Rahmen nach einem der Ansprüche 1 bis 15,
    dadurch gekennzeichnet, dass
    er einen Rand gegenüber dem Versteifungsrand (20, 48a, 48b) aufweist, an dem die Lochmaske (5) befestigt ist, die mindestens aus einer der äußeren und inneren Membran (31, 32) der Seiten (30a, 30b, 30c, 30d) des Rahmens (30) besteht, um 90° nach innen in den Rahmen umgebogen wird und Versteifungsrippen aufweist, mit deren Hilfe eine magnetische Abschirmung (9) der Kathodenstrahlröhre durch Verklemmen befestigt werden kann.
  17. Rahmen nach einem der Ansprüche 1 bis 16,
    dadurch gekennzeichnet, dass
    er zwei gegenüberliegende parallele Ränder (47a, 47b) aufweist, die jeweils einen Rand (47a, 47b) für die Montage der Lochmaske enthalten, welche mindestens aus einem Teil der Membranen der beiden Ränder (47a, 47b) des Rahmens (46) bestehen, die so in das Innere des Rahmens umgebogen werden, dass die Ränder (48a, 48b) für die Montage der Lochmaske in derselben zylindrischen Fläche liegen.
  18. Rahmen nach einem der Ansprüche 1 bis 17,
    dadurch gekennzeichnet, dass
    die Ränder (30a, 30b, 30c, 30d) des Rahmens (30) auf den Seitenflächen eines rechteckigen Parallelepipeds angeordnet sind.
  19. Verfahren für die Herstellung einer Lochmaske einer Kathodenstrahlröhre, wie zum Beispiel einer Röhre für einen Farbfernseher, wobei dieser Rahmen flache Ränder aufweist, die weitgehend an den Seitenflächen einer geraden prismatischen Fläche angeordnet sind,
    dadurch gekennzeichnet, dass
    aus mindestens einem dünnen metallischen Streifen wenigstens eine erste Membran (11, 21, 31, 41) und wenigstens eine zweite Membran (12, 22, 32, 42) ausgeschnitten wird, die in der Längsrichtung des metallischen Streifens mindestens einen Bereich (11a, 11b, 11c, 11d, 12a, 12b, 12c, 12d, 21a, 21b, 22a, 22b, 41a, 42a) aufweist, welcher die Form eines flachen Randes des herzustellenden Rahmens besitzt, um an jedem Rand des herzustellenden Rahmens eine erste Membran und ein zweite Membran herzustellen, die übereinander gelegt werden können,
    und dass in jedem der Bereiche der ersten und der zweiten Membran durch Verformung des entsprechenden metallischen Streifens tiefgezogene Bereiche oder Versteifungsrippen (13, 14) hergestellt werden, und
    der Rahmen durch Verschweißung der Membranen in zusammengesetzten Positionen miteinander verschweißt wird.
  20. Verfahren nach Anspruch 19,
    dadurch gekennzeichnet, dass
    die erste und die zweite Membran (11, 21, 31, 41, 12, 22, 32, 42) außerdem mindestens einen Winkelbereich oder Anschlussbereich (11e, 11f, 11g, 11h,, 12e, 12f, 12g, 12h) in einem Bereich aufweist, der die Form eines flachen Randes des Rahmens hat.
  21. Verfahren nach einem der Ansprüche 19 und 20,
    dadurch gekennzeichnet, dass
    das Umbiegen und die Anordnung der ersten und der zweiten Membran aneinander entsprechend dem herzustellenden Rahmen durchgeführt wird, und
    die zusammengesetzten und in der Form des herzustellenden Rahmens gehaltenen ersten und zweiten Membranen miteinander verschweißt werden.
  22. Verfahren nach einem der Ansprüche 19 und 20,
    dadurch gekennzeichnet, dass
    die erste und die zweite Membran so übereinandergelegt werden, dass die Bereiche (41a, 42a), die demselben Rand des Rahmens entsprechen, übereinander liegen,
    und dass die Verbindung der Membranen in ihrer übereinander liegenden Position gehalten wird, und
    die übereinandergelegten und miteinander verbundenen Membranen umgebogen und aneinander montiert werden, um den Rahmen herzustellen.
  23. Verfahren nach Anspruch 22,
    dadurch gekennzeichnet, dass
    die Verbindung der Membranen in der übereinandergelegten Position dadurch erreicht wird, dass eine Lötschicht auf eine Fläche der ersten Membran aufgetragen und die zweite Membran auf diese Fläche der ersten Membran aufgelegt wird, auf der sich die Lötschicht befindet, und schließlich die übereinandergelegten Membranen auf die Löttemperatur erwärmt werden.
  24. Verfahren nach einem der Ansprüche 19 bis 23 für die Herstellung eines Rahmens, dessen flache Ränder (30a, 30b, 30c, 30d) an den Seitenrändern eines rechteckigen Parallelepipeds angeordnet sind,
    dadurch gekennzeichnet, dass
    die erste Membran (11) und die zweite Membran (12) an ihrer Längsseite vier Bereiche (11a, 11b, 11c, 11d, 12a, 12b, 12c, 12d) aufweisen, welche die Form der vier Ränder des Rahmens in Form eines rechteckigen Paralellepipeds haben, sowie drei Winkelbereiche (12e, 12d, 12g) enthalten, die zwischen den beiden Bereichen angeordnet sind, welche zwei Rändern des Rahmens und einem Anschlussbereich an einem der Endabschnitte der Membranen (11, 12) entsprechen.
  25. Verfahren nach einem der Ansprüche 19 bis 23 für die Herstellung eines Rahmens, dessen flache Ränder an den Seitenflächen eines rechteckigen Paralellepipeds angeordnet sind,
    dadurch gekennzeichnet, dass
    zwei erste Membranen (21, 22') und zwei zweite Membranen (22, 22') ausgeschnitten werden, die jeweils einen ersten Bereich aufweisen, der einem ersten Rand des Rahmens entspricht, sowie einen zweiten Bereich enthalten, welcher einem zweiten Rand des Rahmens entspricht, und dass ein Winkelbereich zwischen dem ersten und dem zweiten Bereich und einem Bereich für den Anschluss an einem der Endabschnitte der Membran vorgesehen ist.
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
FR9606366 1996-05-22
FR9606366A FR2749104B1 (fr) 1996-05-22 1996-05-22 Cadre de masque perfore d'un tube a rayons cathodiques et procede de fabrication

Related Child Applications (1)

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EP0809272B1 true EP0809272B1 (de) 2003-05-02

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EP00103229A Withdrawn EP0999571A3 (de) 1996-05-22 1997-05-15 Aufhängungselement für einen Lochmasken-Rahmen

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EP (2) EP0809272B1 (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)
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RU2184405C2 (ru) 2002-06-27
CN1169585A (zh) 1998-01-07
HUP9902464A2 (hu) 1999-11-29
CN1088907C (zh) 2002-08-07
CA2255568A1 (fr) 1997-11-27
JP3704545B2 (ja) 2005-10-12
JP2000509550A (ja) 2000-07-25
KR100449785B1 (ko) 2004-12-03
WO1997044806A1 (fr) 1997-11-27
EP0999571A2 (de) 2000-05-10
BR9709344A (pt) 1999-08-10
KR970076967A (ko) 1997-12-12
TW428195B (en) 2001-04-01
US5898259A (en) 1999-04-27
FR2749104B1 (fr) 1998-08-28
EP0999571A3 (de) 2002-01-02
PL330077A1 (en) 1999-04-26
FR2749104A1 (fr) 1997-11-28
EP0809272A1 (de) 1997-11-26
DE69721375T2 (de) 2004-03-25
DE69721375D1 (de) 2003-06-05
HUP9902464A3 (en) 2002-02-28
ATE239301T1 (de) 2003-05-15

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