EP0366523A1 - Imaging shadow mask tube, mainly for colour television - Google Patents
Imaging shadow mask tube, mainly for colour television Download PDFInfo
- Publication number
- EP0366523A1 EP0366523A1 EP89402864A EP89402864A EP0366523A1 EP 0366523 A1 EP0366523 A1 EP 0366523A1 EP 89402864 A EP89402864 A EP 89402864A EP 89402864 A EP89402864 A EP 89402864A EP 0366523 A1 EP0366523 A1 EP 0366523A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heavy metal
- silicate
- mask
- compound
- tube
- 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
Links
- 238000003384 imaging method Methods 0.000 title abstract 2
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 35
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 10
- 150000002736 metal compounds Chemical class 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000004111 Potassium silicate Substances 0.000 claims abstract description 6
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052913 potassium silicate Inorganic materials 0.000 claims abstract description 6
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 229910052797 bismuth Inorganic materials 0.000 claims description 10
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 10
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 150000004760 silicates Chemical class 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 claims description 2
- 229910052912 lithium silicate Inorganic materials 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 230000000873 masking effect Effects 0.000 abstract 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- DQUIAMCJEJUUJC-UHFFFAOYSA-N dibismuth;dioxido(oxo)silane Chemical compound [Bi+3].[Bi+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O DQUIAMCJEJUUJC-UHFFFAOYSA-N 0.000 description 1
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/07—Shadow masks
- H01J2229/0727—Aperture plate
- H01J2229/0777—Coatings
Definitions
- the invention relates to a mask tube for viewing, in particular color television.
- a mask-type color television tube is formed by a glass bulb ending in a screen panel on which phosphors are deposited which, when struck by electrons, produce a generally red, green light radiation or blue. These phosphors are arranged on the screen in triads, a triad comprising a green phosphor, a red phosphor and a blue phosphor, each phosphor being excited by a corresponding electron beam.
- a mask In front of the tube is placed a mask having holes of dimensions and arrangements such that in each triad the phosphor of a determined color is only excited by the electron beam assigned to this color.
- the invention overcomes this drawback.
- the heavy metal or the compound of heavy metal is mixed with an alkali silicate, the ratio between the weight of heavy metal, or compound of heavy metal, and the weight of silicate, being between 7 and 17, and preferably equal to 12.
- the alkali silicate is for example chosen from at least one of the following silicates: potassium silicate, lithium silicate, sodium silicate.
- an alkaline silicate for example potassium silicate
- an alkaline silicate allows good adhesion to the metal mask as well as good homogeneity of the mixture of the heavy metal, or of the heavy metal compound, with this silicate.
- the amount of heavy metal deposited per unit area is greater than with the known technique.
- the chosen proportion of silicate is sufficiently low so as not to substantially disturb the effect of reduction of heating produced by the heavy metal.
- this ratio between the weight of heavy metal, or compound of heavy metal, and the weight of silicate ensures optimum adhesion to the metal mask and makes it possible to produce the coating with spraying or spraying equipment.
- the alkali silicate is stable at high temperature, above 400 ° C, which allows it to withstand the heat treatment undergone by the mask during the manufacture of the tube.
- the mixture of heavy metal, or of heavy metal compound, with the alkali silicate be formed of grains with dimensions of the order of 0.5 to 0.8 ⁇ m.
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
L'invention est relative à un tube à masque pour la visualisation, notamment la télévision en couleurs.The invention relates to a mask tube for viewing, in particular color television.
Un tube de télévision en couleurs du type à masque est formé d'une ampoule de verre se terminant par une dalle-écran sur laquelle sont déposés des luminophores qui, lorsqu'ils sont frappés par des électrons, produisent un rayonnement lumineux généralement rouge, vert ou bleu. Ces luminophores sont disposés sur l'écran par triades, une triade comprenant un luminophore vert, un luminophore rouge et un luminophore bleu, chaque luminophore étant excité par un faisceau d'électrons correspondant.A mask-type color television tube is formed by a glass bulb ending in a screen panel on which phosphors are deposited which, when struck by electrons, produce a generally red, green light radiation or blue. These phosphors are arranged on the screen in triads, a triad comprising a green phosphor, a red phosphor and a blue phosphor, each phosphor being excited by a corresponding electron beam.
Devant le tube est disposé un masque présentant des trous de dimensions et dispositions telles que dans chaque triade le luminophore d'une couleur déterminée ne soit excité que par le faisceau d'électrons affecté à cette couleur.In front of the tube is placed a mask having holes of dimensions and arrangements such that in each triad the phosphor of a determined color is only excited by the electron beam assigned to this color.
Une grande partie des électrons des trois faisceaux est arrêtée par le masque. L'impact des électrons échauffe le masque et cette élévation de température provoque une déformation qui peut altérer les couleurs de l'image sur l'écran.A large part of the electrons of the three beams is stopped by the mask. The impact of electrons heats the mask and this rise in temperature causes a deformation which can alter the colors of the image on the screen.
Pour réduire l'échauffement du masque on a déjà proposé de recouvrir la face du masque d'acier qui est tournée vers les canons à électrons (à l'opposé de l'écran), par un métal lourd ou un composé d'un métal lourd, de numéro atomique supérieur à 70. Ce métal lourd, qui est par exemple le bismuth, présente un effet réflecteur pour les électrons, ce qui réduit l'absorption et donc l'échauffement.To reduce the heating of the mask, it has already been proposed to cover the face of the steel mask which faces the electron guns (opposite the screen), with a heavy metal or a metal compound. heavy, with an atomic number greater than 70. This heavy metal, which is for example bismuth, has a reflective effect for the electrons, which reduces absorption and therefore heating.
On a constaté que le revêtement de métal lourd ou de composé de métal lourd sur le masque présentait des défauts d'homogénéité et que ces défauts altéraient le pouvoir réflecteur du revêtement.It has been found that the coating of heavy metal or of heavy metal compound on the mask exhibits homogeneity defects and that these defects impair the reflective power of the coating.
L'invention remédie à cet inconvénient.The invention overcomes this drawback.
Elle est caractérisée en ce que le métal lourd ou le composé de métal lourd est mélangé à un silicate alcalin, le rapport entre le poids de métal lourd, ou composé de métal lourd, et le poids de silicate, étant compris entre 7 et 17, et de préférence égal à 12.It is characterized in that the heavy metal or the compound of heavy metal is mixed with an alkali silicate, the ratio between the weight of heavy metal, or compound of heavy metal, and the weight of silicate, being between 7 and 17, and preferably equal to 12.
Le silicate alcalin est par exemple choisi parmi au moins l'un des silicates suivants : silicate de potassium, silicate de lithium, silicate de sodium.The alkali silicate is for example chosen from at least one of the following silicates: potassium silicate, lithium silicate, sodium silicate.
L'addition d'un silicate alcalin, par exemple le silicate de potassium, permet une bonne adhérence sur le masque métallique ainsi qu'une bonne homogénéité du mélange du métal lourd, ou du composé de métal lourd, avec ce silicate. la quantité de métal lourd déposée par unité de surface est plus importante qu'avec la technique connue. La proportion choisie de silicate est suffisamment faible pour ne pas perturber sensiblement l'effet de réduction d'échauffement que confère le métal lourd. En outre ce rapport entre le poids de métal lourd, ou composé de métal lourd, et le poids de silicate assure une adhérence optimum sur le masque métallique et permet de réaliser le revêtement avec un appareillage de pulvérisation ou projection. On a d'ailleurs constaté que si la proportion de métal lourd, ou composé de métal lourd, était inférieure à la limite de 7 indiquée ci-dessus on n'obtiendrait pas une adhérence correcte du revêtement sur le masque. En outre dans le cas où le composé de métal lourd est de l'oxyde de bismuth et le silicate alcalin est le silicate de potassium, il ne se forme pas de silicate de bismuth, notamment avec le rapport 12, puisque la silice est en défaut par rapport au bismuth.The addition of an alkaline silicate, for example potassium silicate, allows good adhesion to the metal mask as well as good homogeneity of the mixture of the heavy metal, or of the heavy metal compound, with this silicate. the amount of heavy metal deposited per unit area is greater than with the known technique. The chosen proportion of silicate is sufficiently low so as not to substantially disturb the effect of reduction of heating produced by the heavy metal. In addition, this ratio between the weight of heavy metal, or compound of heavy metal, and the weight of silicate ensures optimum adhesion to the metal mask and makes it possible to produce the coating with spraying or spraying equipment. It has also been found that if the proportion of heavy metal, or compound of heavy metal, was less than the limit of 7 indicated above, a correct adhesion of the coating to the mask would not be obtained. In addition, in the case where the heavy metal compound is bismuth oxide and the alkali silicate is potassium silicate, bismuth silicate is not formed, in particular with the ratio 12, since the silica is in default compared to bismuth.
Le silicate alcalin est stable à haute température, supérieure à 400° C, ce qui lui permet de résister au traitement thermique subi par le masque au cours de la fabrication du tube.The alkali silicate is stable at high temperature, above 400 ° C, which allows it to withstand the heat treatment undergone by the mask during the manufacture of the tube.
Pour obtenir de meilleurs résultats il est préférable que le mélange de métal lourd, ou de composé de métal lourd, avec le silicate alcalin, soit formé de grains de dimensions de l'ordre de 0,5 à 0,8 µm.For best results, it is preferable that the mixture of heavy metal, or of heavy metal compound, with the alkali silicate, be formed of grains with dimensions of the order of 0.5 to 0.8 μm.
Avec l'utilisation du mélange de métal lourd, ou composé de métal lourd, et de silicate alcalin on a constaté une réduction sensible de la température du masque à base de fer, qui se traduit par une diminution de l'ordre de 35 à 45 % de la déformation du masque au début du fonctionnement du tube .
- La figure 1 est une vue au microscope électronique de la surface d'un masque de tube de télévision en couleurs recouverte de bismuth à l'aide d'une technique classique et
- la figure 2 est une vue analogue mais avec utilisation de l'invention, c'est-à-dire, dans cet exemple, une vue de surface de masque recouverte d'un mélange de silicate de potassium et de bismuth.
- FIG. 1 is an electron microscope view of the surface of a color television tube mask covered with bismuth using a conventional technique and
- Figure 2 is a similar view but with use of the invention, that is to say, in this example, a mask surface view covered with a mixture of potassium silicate and bismuth.
Sur ces deux figures, plus le masque est clair et plus la densité de bismuth est importante. On voit que, dans l'ensemble, les zones blanches 10 sur la figure 2 sont de plus grande surface que les zones blanches 10 sur la figure 1. Ainsi, en surface, la densité de bismuth est plus grande avec l'invention. On a aussi constaté que l'invention permet d'augmenter la densité de bismuth en volume.In these two figures, the brighter the mask, the greater the density of bismuth. It can be seen that, overall, the
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8813912A FR2638282B1 (en) | 1988-10-25 | 1988-10-25 | MASK TUBE FOR VISUALIZATION, ESPECIALLY COLOR TELEVISION |
| FR8813912 | 1988-10-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0366523A1 true EP0366523A1 (en) | 1990-05-02 |
| EP0366523B1 EP0366523B1 (en) | 1993-08-11 |
Family
ID=9371243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89402864A Expired - Lifetime EP0366523B1 (en) | 1988-10-25 | 1989-10-17 | Imaging shadow mask tube, mainly for colour television |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0366523B1 (en) |
| JP (1) | JPH02297841A (en) |
| KR (1) | KR0130199B1 (en) |
| CA (1) | CA2001321C (en) |
| DE (1) | DE68908338T2 (en) |
| ES (1) | ES2044179T3 (en) |
| FR (1) | FR2638282B1 (en) |
| PL (1) | PL161192B1 (en) |
| RU (1) | RU2035791C1 (en) |
| TN (1) | TNSN89115A1 (en) |
| TR (1) | TR25751A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0522273A1 (en) * | 1991-06-07 | 1993-01-13 | Nokia (Deutschland) GmbH | Shadow mask for picture tubes |
| EP0682807A1 (en) * | 1993-10-28 | 1995-11-22 | Chunghwa Picture Tubes, Ltd. | Shadow mask damping for color crt |
| GB2320608A (en) * | 1996-12-20 | 1998-06-24 | Samsung Display Devices Co Ltd | A shadow mask having an insulating layer and a process for the production of same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW305051B (en) | 1995-09-18 | 1997-05-11 | Hitachi Ltd |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4442376A (en) * | 1980-07-16 | 1984-04-10 | U.S. Philips Corporation | Color display tube having heavy metal coating on color selection electrode |
| EP0156427A1 (en) * | 1984-03-14 | 1985-10-02 | Koninklijke Philips Electronics N.V. | Colour display tube |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6050845A (en) * | 1983-08-31 | 1985-03-20 | Toshiba Corp | Manufacture of color picture tube |
| JPS62281241A (en) * | 1986-05-29 | 1987-12-07 | Mitsubishi Electric Corp | Cathode-ray tube |
| JPS62281225A (en) * | 1986-05-29 | 1987-12-07 | Mitsubishi Electric Corp | Manufacture of color picture tube |
| JPS62283526A (en) * | 1986-05-31 | 1987-12-09 | Mitsubishi Electric Corp | Formation of reflection membrane for shadow mask |
-
1988
- 1988-10-25 FR FR8813912A patent/FR2638282B1/en not_active Expired - Lifetime
-
1989
- 1989-10-17 ES ES89402864T patent/ES2044179T3/en not_active Expired - Lifetime
- 1989-10-17 EP EP89402864A patent/EP0366523B1/en not_active Expired - Lifetime
- 1989-10-17 DE DE89402864T patent/DE68908338T2/en not_active Expired - Lifetime
- 1989-10-23 KR KR1019890015179A patent/KR0130199B1/en not_active IP Right Cessation
- 1989-10-23 TR TR89/0910A patent/TR25751A/en unknown
- 1989-10-24 CA CA002001321A patent/CA2001321C/en not_active Expired - Lifetime
- 1989-10-24 PL PL1989281970A patent/PL161192B1/en unknown
- 1989-10-24 RU SU894742256A patent/RU2035791C1/en active
- 1989-10-25 JP JP1276188A patent/JPH02297841A/en active Pending
- 1989-10-25 TN TNTNSN89115A patent/TNSN89115A1/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4442376A (en) * | 1980-07-16 | 1984-04-10 | U.S. Philips Corporation | Color display tube having heavy metal coating on color selection electrode |
| EP0156427A1 (en) * | 1984-03-14 | 1985-10-02 | Koninklijke Philips Electronics N.V. | Colour display tube |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, vol. 12, no. 168 (E-611)[3015], 20 mai 1988, page 147 E 611; & JP-A-62 281 241 (MITSUBISHI ELECTRIC CORP.) 07-12-1987 * |
| PATENT ABSTRACTS OF JAPAN, vol. 9, no. 178 (E-330)[1901], 23 juillet 1985, page 131 E 330; & JP-A-60 50 845 (TOSHIBA K.K.) 20-03-1985 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0522273A1 (en) * | 1991-06-07 | 1993-01-13 | Nokia (Deutschland) GmbH | Shadow mask for picture tubes |
| EP0682807A1 (en) * | 1993-10-28 | 1995-11-22 | Chunghwa Picture Tubes, Ltd. | Shadow mask damping for color crt |
| EP0682807A4 (en) * | 1993-10-28 | 1996-09-04 | Chungwha Picture Tubes Ltd | Shadow mask damping for color crt. |
| GB2320608A (en) * | 1996-12-20 | 1998-06-24 | Samsung Display Devices Co Ltd | A shadow mask having an insulating layer and a process for the production of same |
| NL1007628C2 (en) * | 1996-12-20 | 1998-08-11 | Samsung Display Devices Co Ltd | Shadow mask with an insulating layer and a method for its manufacture. |
| DE19654613C2 (en) * | 1996-12-20 | 2001-07-19 | Samsung Display Devices Co Ltd | Shadow mask with insulation layer and process for its production |
| GB2320608B (en) * | 1996-12-20 | 2001-11-07 | Samsung Display Devices Co Ltd | A shadow mask having an insulating layer and a process for the production of same |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2638282A1 (en) | 1990-04-27 |
| CA2001321C (en) | 2000-12-19 |
| FR2638282B1 (en) | 1996-04-05 |
| RU2035791C1 (en) | 1995-05-20 |
| ES2044179T3 (en) | 1994-01-01 |
| CA2001321A1 (en) | 1990-04-25 |
| PL161192B1 (en) | 1993-05-31 |
| KR900007033A (en) | 1990-05-09 |
| TR25751A (en) | 1993-07-26 |
| EP0366523B1 (en) | 1993-08-11 |
| DE68908338T2 (en) | 1993-12-16 |
| KR0130199B1 (en) | 1998-04-07 |
| TNSN89115A1 (en) | 1991-02-04 |
| JPH02297841A (en) | 1990-12-10 |
| DE68908338D1 (en) | 1993-09-16 |
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