EP0224296B1 - Méthode de faconnage par emboutissage d un masque pour tube d'image en couleur, masque fabriqué selon cette méthode et tube d'image en couleur comprenant un tel masque - Google Patents

Méthode de faconnage par emboutissage d un masque pour tube d'image en couleur, masque fabriqué selon cette méthode et tube d'image en couleur comprenant un tel masque Download PDF

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Publication number
EP0224296B1
EP0224296B1 EP86201961A EP86201961A EP0224296B1 EP 0224296 B1 EP0224296 B1 EP 0224296B1 EP 86201961 A EP86201961 A EP 86201961A EP 86201961 A EP86201961 A EP 86201961A EP 0224296 B1 EP0224296 B1 EP 0224296B1
Authority
EP
European Patent Office
Prior art keywords
shadow mask
skirt
mask sheet
display tube
colour display
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
EP86201961A
Other languages
German (de)
English (en)
Other versions
EP0224296A1 (fr
Inventor
Adrianus Henricus Maria Van Den Berg
Marianus Antonius Gerardus Van De Kerkhof
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Priority to AT86201961T priority Critical patent/ATE50470T1/de
Publication of EP0224296A1 publication Critical patent/EP0224296A1/fr
Application granted granted Critical
Publication of EP0224296B1 publication Critical patent/EP0224296B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • 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
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
    • 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
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes

Definitions

  • the invention relates to a method of drape drawing, by means of a drawing process, a shadow mask sheet for a colour display tube consisting of an iron-nickel alloy of the invar type, in which a skirt is formed on the shadow mask sheet.
  • the invention furthermore relates to a shadow mask manufactured by the method according to the invention.
  • the invention also relates to a colour display tube comprising a shadow mask according to the invention.
  • the shadow mask sheet is generally first given the desired shape, in particular an arcuate shape, and the shadow mask sheet is then provided with a skirt.
  • This skirt is formed by bending over the edge of the shadow mask sheet and it may be used for the connection of the shadow mask in a colour display tube.
  • the drawing process is terminated and the shadow mask is cooled to ambient temperature and the material substantially regains its original, comparatively high 0.2 % proof stress.
  • EP-A 124 354 A similar method is also known from EP-A 124 354.
  • a method of the kind mentioned in the opening paragraph is characterized according to the invention in that in addition to the formation of the skirt, said skirt is plastically deformed permanently. It has been found that as a result of the permanent plastic deformation of the skirt, the shape and the position of the skirt are very much controlled. The extent of outward resiling is reduced as a result of which a good reproducibility of the shape of the shadow mask sheet is obtained.
  • An additional advantage of the invention is that the skirt can fully engage a supporting frame and can more easily be welded to said supporting frame.
  • An embodiment of a method in accordance with the invention is characterized in that the permanent plastic deformation of the skirt takes place at a temperature between 150 ° C and 250 ° C.
  • the plastic deformation is carried out at room temperature, the comparatively high 0.2 % proof stress leads to the material being difficult to work mechanically.
  • the tensile stress at which the shadow mask material reaches the 0.2 % proof stress is reduced when the plastic deformation takes place at a temperature between 150°C and 250°C. As a result of this the mechanical workability is increased and the level of the reproducibility of the drawing process is satisfactory.
  • a further embodiment of a method in accordance with the invention is characterized in that the plastic deformation of the skirt takes place at least substantially simultaneously with the formation of the skirt, and that a flange is formed on said skirt.
  • the skirt is provided on the shadow mask sheet by means of a drawing operation.
  • the plastic deformation of said skirt involves a complementary operation which takes some time.
  • the formation of the skirt and the plastic deformation thereof can be done simultaneously. This provides a saving in time since according to the invention no complementary operation is necessary any longer for the deformation.
  • a complementary heating for the plastic deformation of the skirt of the shadow mask sheet is no longer necessary since the drawing process of the shadow mask sheet can take place already at a temperature between 150°C and 250 ° C.
  • Still a further embodiment of a method in accordance with the invention is characterized in that prior to the formation of the flange recesses are provided in the shadow mask sheet, said recesses being formed at least for the greater part in that part of the shadow mask sheet which afterwards constitutes the flange. If the shadow mask is to be connected to a supporting frame, for example by means of spot-welding, it must be possible for the welding apparatus to contact the skirt. The outwardly directed flange could consitute an obstruction therefor. By providing recesses in the flange at the areas where the spot welds have to be provided, the welding apparatus can reach the skirt at these places.
  • said recesses can be provided in the shadow mask sheet by means of an etching process, for example the same etching process with which mask holes are provided in the shadow mask sheet.
  • an etching process for example the same etching process with which mask holes are provided in the shadow mask sheet.
  • a shadow mask sheet consisting of an iron-nickel alloy of the invar type which comprises 35-37 % by weight of nickel can be subjected to an annealing treatment preceding the actual drawing process, for example, at a temperature between 700°C and 820 ° C for a period of time which is sufficient to produce complete recrystallisation of the material of the shadow mask sheet without essential grain growth occurring.
  • an annealing treatment preceding the actual drawing process, for example, at a temperature between 700°C and 820 ° C for a period of time which is sufficient to produce complete recrystallisation of the material of the shadow mask sheet without essential grain growth occurring.
  • the tensile stress at which the 0.2 % proof stress is reached is reduced.
  • the 0.2 % proof stress reached is still too high to obtain a reproducible process for drape drawing the shadow mask sheet.
  • a further reduction of the 0.2 % proof stress has proved necessary.
  • Figure 1 shows the variation of the tensile stress at the 0.2 % proof stress as a function of the temperature.
  • the temperature dependance on the 0.2 % proof stress decreases considerably with increasing temperature.
  • a comparatively small reduction of the 0.2 % proof stress is still obtained.
  • practical problems start playing a role with regard to the drawing tools which no longer outweigh the advantage of a lower 0.2 % proof stress.
  • FIG 2 is a diagrammatic sectional view of the device for drape drawing a shadow mask sheet 1.
  • the device for drape drawing the shadow mask sheet 1 comprises a draw die 2 (sometimes termed “mandril"), a pressure ring 3 (sometimes termed “pleat holder”) and a draw ring 4.
  • a shadow mask sheet 1 is laid on the draw die 2.
  • the draw ring 4 is then lowered towards the pressure ring 3 so that the shadow mask sheet 1 becomes clamped on opposite sides at its periphery between the draw ring 4 and the pressure ring 3 in a slip-free manner (see Figure 3).
  • the actual drape drawing of the shadow mask sheet 1 takes place by simultaneously lowering the draw ring 4 and the pressure ring 3 as is shown in Figure 4.
  • the shadow mask sheet 1 is then drawn over the draw die 2.
  • the temperature of the shadow mask sheet 1 is adjusted to between 1500C and 250 ° C.
  • the draw die 2 comprises a copper block 5 in which electrical heating elements 6 are embedded.
  • the pressure ring 3 comprises copper blocks 7 with heating elemens 8 and the draw ring 4 comprises copper blocks 9 with heating elements 10.
  • the shadow mask sheet 1 can be heated by heating the drawing tools to between 150°C and 250°C.
  • the shadow mask sheet 1 may alternatively be heated previously in a furnace at a temperature between 150°C and 250°C.
  • the draw die 2 comprises a number of heat pipes 11 which ensure temperature equalisation at the surface of the draw die 2.
  • the shadow mask sheet 1 After the shadow mask sheet 1 has been drape drawn, it is provided at its periphery with a skirt by bending over peripheral portions of the shadow mask sheet 1. For this purpose the pressure ring 3 is lowered until it bears freely on springs 12 (see Figure 5). The shadow mask sheet 2 is then no longer clamped at its periphery between the pressure ring 3 and the draw ring 4, but is clamped between an ejector 13 and the draw die 2.
  • the ejector 13 also comprises a copper block 14 with heating elements 15 so that the shadow mask sheet 1 contacts the ejector 13 which is also heated to between 150°C and 250 ° C.
  • the draw ring 4 is then lowered further so that a rim 16 of the skirt 22 becomes clamped between the draw ring 4 and the pressure ring 3 ( Figure 6).
  • the pressure ring 3 and the draw ring 4 then compress the springs 12 over a readily defined distance while the rim 16 of the skirt 22 remains clamped.
  • the skirt 22 is thereby stretched and consequently plastically deformed.
  • the springs 12 are located directly below the faces of the draw ring 4 and pressure ring 3 between which the shadow mask sheet 1 is clamped.
  • the number of springs 12 is chosen so that the pressure force of the draw ring 4 is distributed uniformly between said springs 12.
  • the back pressure provided by the springs 12 when the skirt 22 is formed is equal to the pressure with which the pressure ring 3 and the draw ring 4 are lowered.
  • the rim 16 must be sufficiently wide to ensure permanent good clamping.
  • the springs 12 are then relaxed by raising the ejector 13 ( Figure 7). After the forming of the skirt 22 the draw ring 4 is raised and lifts the shadow mask 1 with it. Finally, the shadow mask 1 is ejected from the draw ring 4 by the ejector 13 ( Figure 8) and discharged. If the shadow mask 1 is removed rapidly from the draw die 2 the shadow mask 1 may be deformed as a result of this rapid raising because the shadow mask 1 is heated. In order to prevent this the shadow mask 1, while still clamped between the pressure ring 3 and the draw ring 4, can be raised slowly by means of a lever system 17 to a position some distance above the draw die 2. As a result of this the possibility of deformation of the shadow mask 1 is reduced.
  • the lever system 17 may be operated by means of compressed air, for example. After the shadow mask 1 has been raised slowly to said position above the draw die 2, the shadow mask 1 can be rapidly raised further.
  • the shape given to the skirt 22 by the plastic deformation need not be restricted to an outwardly directed flange 18 as described. When after termination of the drawing process the skirt 22 is plastically deformed, this may be done in various manners. If, however, it is desired for the plastic deformation of the skirt 22 to take place substantially simultaneously with the formation of the skirt 22, according to the embodiment of the invention the form of said plastic deformation is restricted to the outwardly directed flange 18.
  • a shadow mask 1 manufactured by means of the method according to the invention is shown in Figure 9.
  • the shape of the shadow mask 1 has become readily reproducible.
  • an outwardly directed flange 18 has moreover been formed on the skirt 22.
  • the width of the flange 18 corresponds to the width of the rim 16 which is still clamped between the draw ring 4 and the pressure ring 3 at the end of the drawing process.
  • the rim 16 must be sufficiently wide to ensure a good clamping and consequently a readily reproducible shape of the shadow mask 1.
  • the width of the flange 18 should preferably be between 1 and 5 mm.
  • the outwardly directed flange 18 constitutes an obstruction. It is of advantage to make a few recesses 20 in the rim of the shadow mask sheet 1, for example, by etching the recesses during the etching of the mask holes 21. Due to these recesses 20, which are present in the flange 18 after the drawing process, the welding apparatus during welding can reach the skirt 22 of the shadow mask 1 without any obstruction at the area of the recesses 20.
  • the width of the recesses 20 should be adapted to the width of the spot welding apparatus.
  • the width of the recesses 20 should preferably be between 16 and 16 mm. When selecting the depth of the recesses 20 the same two arguments should be considered which played a role in the selection of the width of the recesses 20. A depth of the recess 20 which is at least substantially equal to the flange width is to be preferred.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Claims (7)

1. Procédé d'emboutissage, au moyen d'un processus d'étirage, d'une feuille de masqué d'ombre pour un tube-image en couleur, constituée d'un alliage de nickel-fer du type Invar, dans lequel la feuille de masque d'ombre est munie d'une jupe, caractérisé en ce qu'additionnellement à la formation de la jupe, ladite jupe est soumise à une déformation plastique permanente.
2. Procédé selon la revendication 1, caractérisé en ce que la déformation plastique permanente de la jupe a lieu à une température située entre 150°C et 250°C.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la déformation plastique de la jupe a lieu au moins pratiquement simultanément avec la formation de la jupe et en ce que ladite jupe est munie d'un rebord.
4. Procédé selon la revendication 3, caractérisé en ce qu'avant la formation du rebord, des évidements sont réalisés dans la feuille de masque d'ombre, lesdits évidements étant formés au moins en majeure partie dans la partie de la feuille de masque d'ombre qui, par la suite, constituera le rebord.
5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un alliage contenant 35 à 37 pour cent en poids de nickel est choisi pour l'alliage de nickel-fer du type Invar.
6. Masque d'ombre fabriqué au moyen du procédé selon l'une quelconque des revendications précédentes.
7. Tube-image en couleur comportant un masque d'ombre selon la revendication 6.
EP86201961A 1985-11-11 1986-11-10 Méthode de faconnage par emboutissage d un masque pour tube d'image en couleur, masque fabriqué selon cette méthode et tube d'image en couleur comprenant un tel masque Expired - Lifetime EP0224296B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86201961T ATE50470T1 (de) 1985-11-11 1986-11-10 Verfahren zum tiefziehen einer schattenmaske fuer eine farbbildroehre, nach dieser methode hergestellte maske und farbbildroehre mit einer solchen maske.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8503087A NL8503087A (nl) 1985-11-11 1985-11-11 Werkwijze voor het in vorm trekken van een schaduwmasker voor een kleurenbeeldbuis, schaduwmasker vervaardigd volgens genoemde werkwijze en kleurenbeeldbuis voorzien van zulk een schaduwmasker.
NL8503087 1985-11-11

Publications (2)

Publication Number Publication Date
EP0224296A1 EP0224296A1 (fr) 1987-06-03
EP0224296B1 true EP0224296B1 (fr) 1990-02-21

Family

ID=19846835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86201961A Expired - Lifetime EP0224296B1 (fr) 1985-11-11 1986-11-10 Méthode de faconnage par emboutissage d un masque pour tube d'image en couleur, masque fabriqué selon cette méthode et tube d'image en couleur comprenant un tel masque

Country Status (9)

Country Link
EP (1) EP0224296B1 (fr)
JP (1) JPH0754662B2 (fr)
KR (1) KR950002261B1 (fr)
CN (1) CN1007849B (fr)
AT (1) ATE50470T1 (fr)
DD (1) DD250398A5 (fr)
DE (1) DE3669089D1 (fr)
ES (1) ES2013993B3 (fr)
NL (1) NL8503087A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1239511B (it) * 1990-03-30 1993-11-03 Videocolor Spa Metodo di formatura di una maschera d'ombra per un tubo di riproduzione di immagini a colori
IT1251416B (it) * 1991-10-23 1995-05-09 Videocolor Spa Processo di fabbricazione di una maschera di selezione dei colori per un tubo a raggi catodici e dispositivo per la realizzazione di tale processo
KR100281371B1 (ko) * 1992-11-23 2001-03-02 요트.게.아. 롤페즈 칼라디스플레이튜브용칼라선택수단

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584366A (en) * 1968-08-07 1971-06-15 Wallace Expanding Machines Process for manufacture of shadow mask frames
NL7508287A (nl) * 1975-07-11 1977-01-13 Philips Nv Werkwijze en inrichting voor het in vorm trek- ken van een schaduwmasker en schaduwmasker ge- trokken volgens deze werkwijze of met deze in- richting.
JPS59200721A (ja) * 1983-04-27 1984-11-14 Toshiba Corp シヤドウマスクの製造方法
JPS6148523A (ja) * 1984-08-10 1986-03-10 Toshiba Corp シヤドウマスクの製造方法
JPS6282625A (ja) * 1985-10-04 1987-04-16 Toshiba Corp シヤドウマスクの製造方法

Also Published As

Publication number Publication date
DE3669089D1 (de) 1990-03-29
EP0224296A1 (fr) 1987-06-03
CN86107752A (zh) 1988-05-18
NL8503087A (nl) 1987-06-01
JPS62113333A (ja) 1987-05-25
DD250398A5 (de) 1987-10-08
JPH0754662B2 (ja) 1995-06-07
CN1007849B (zh) 1990-05-02
KR870005431A (ko) 1987-06-08
KR950002261B1 (ko) 1995-03-15
ES2013993B3 (es) 1990-06-16
ATE50470T1 (de) 1990-03-15

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