MXPA99003991A - Alarged mask for image pipes to co - Google Patents
Alarged mask for image pipes to coInfo
- Publication number
- MXPA99003991A MXPA99003991A MXPA/A/1999/003991A MX9903991A MXPA99003991A MX PA99003991 A MXPA99003991 A MX PA99003991A MX 9903991 A MX9903991 A MX 9903991A MX PA99003991 A MXPA99003991 A MX PA99003991A
- Authority
- MX
- Mexico
- Prior art keywords
- nickel
- mask
- iron alloy
- sheet
- color
- Prior art date
Links
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005530 etching Methods 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 239000011572 manganese Substances 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 description 13
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical group [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000007769 metal material Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910001374 Invar Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K Iron(III) chloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000005018 casein Substances 0.000 description 1
- 235000021240 caseins Nutrition 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- -1 iron-nickel Chemical compound 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001590 oxidative Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged Effects 0.000 description 1
- 230000001681 protective Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N silicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention relates to an elongated mask for a color image tube, the elongated mask comprising a sheet of nickel-iron alloy steel, made of a nickel-iron alloy containing 35.0% to 37.0% by weight of nickel, manganese in a content of more than 0.1% and less than 0.6%, and 0.03% to 0.06% by weight of carbon, the sheet of nickel-iron alloy steel being provided with apertures by etching, using a pattern provided on the nickel-iron alloy steel sheet
Description
ALARGED MASK FOR COLOR IMAGE TUBE
BACKGROUND OF THE INVENTION The present invention relates to an elongated or stretched mask for a color picture tube, which can be used for any color picture tube, for example a shadow mask tube or a grating tube with openings , on a color television or computer color screens. In the color picture tubes for color televisions and color screens a mask is used for color selection, so that the electron beams are applied to the phosphors or predetermined fluorescent substance. As the color selection mask, a shadow mask formed from a metal foil provided with a large number of small holes or a grid of openings provided with a large number of grooves is used. When a color image tube is used continuously for a prolonged period, the shadow mask or the aperture grid heats up because the accelerated electrons collide against it, and it deforms by thermal expansion. This can cause the electron beams to be gradually displaced relative to the phosphor screen, resulting in color shift in the color image.
As a color selection mask for a color picture tube, an elongated or stretched mask is used for color discrimination, such as a grid of openings that extend into a firm frame, as well as a pressed member such as a shadow mask . The elongated mask for color discrimination is formed as follows. A strip of low carbon steel hot rolled, containing carbon in units of 0.0001% is cold rolled to a sheet with a thickness of 0.02 mm to 0.30 mm. After a large number of grid elements have been formed on the steel sheet by etching, the steel sheet is welded to a frame placed under applied pressure in a direction reverse to the direction of elongation. Then, the pressure is removed to form tension by restoring the strength of the frame. Next, to avoid the generation of secondary electrons, thermal radiation, rust formation, etc., the material of the mask is subjected to thermal treatment for 10 to 20 minutes in an oxidizing atmosphere at 450 ° C up to 470 ° C, blackening by this means the surface of the mask. In a color image tube, the temperature of the mask for color discrimination is raised by irradiation with electron beams. However, the mask for color discrimination approximately reaches thermal equilibrium approximately 2 hours after
start the energization. In the case of a mask for color discrimination made from a sheet of steel at low carbon, the thermal expansion occurs to a considerable degree as the temperature increases. Therefore, the color discrimination mask needs to be elongated under high tension so that the elongated element for color discrimination does not loosen during use. For elongation with high tension a high strength element is necessary, and a frame for mounting the elongated mask also needs high resistance. Under these circumstances, a method has been designed in which deformation or the like due to the increase in temperature is avoided by using a metallic material having a low coefficient of thermal expansion. However, an Invar material consisting of a nickel-iron alloy which is usually a low thermal expansion metallic material used for shade masks of color image tubes does not have sufficiently high resistance and is therefore unable to provide a sheet that supports a tension necessary for elongation. Accordingly, it is impossible to obtain a satisfactory sheet to produce an elongated mask for color discrimination. Meanwhile, the elongated element for color discrimination needs to reduce the thickness of the metallic material
in comparison with an element for color discrimination formed by compression in accordance with the curved surface of a color picture tube. Therefore, the color discrimination element made of a low carbon steel sheet can not provide a satisfactory magnetic shielding effect. An object of the present invention is to provide an elongated color selection device for a color image tube that has a high magnetic shielding effect and a low coefficient of thermal expansion and therefore allows the tension in the elongation to be reduced .
BRIEF DESCRIPTION OF THE DRAWINGS The only Figure 1 is a diagram illustrating the configuration of a test piece used in a tensile test in an elongated mask for a color picture tube, according to the present invention.
COMPENDIUM OF THE INVENTION The present invention provides an elongated mask for a color picture tube. The elongated mask is formed from a steel sheet of nickel-iron alloy made from a nickel-iron alloy containing 35.0% to 37.0% by weight of nickel and 0.01% to 0.06% by weight.
carbon weight. The nickel-iron alloy steel sheet is provided with etched openings using a pattern provided on the nickel-iron alloy steel sheet. In the elongated mask, the steel sheet of the nickel-iron alloy contains, based on weight, 35.0% to 37.0% nickel, 0.01% to 0.06% carbon, no more than 0.30% silicon, 0.10% a 0.60% manganese, no more than 0.020% phosphorus, no more than 0.020% sulfur and occasional impurities as different iron components. In addition, the present invention provides a material for producing an elongated mask for a color picture tube. The material consists essentially of a nickel-iron alloy containing 35.0% to 37.0% by weight of nickel and 0.01% to 0.06% by weight of carbon.
DESCRIPTION OF THE PREFERRED MODALITY The present invention is based on the finding that it is impossible to obtain an elongated mask with a low coefficient of thermal expansion and that it presents sufficiently high strength even when the thickness is reduced, using a nickel-iron alloy with a specific composition of the alloy instead of the conventional low carbon steel.
More specifically, the elongated mask according to the present invention is formed using a nickel-iron alloy, for example, an Invar alloy, which is known as a low expansion alloy. The nickel-iron alloy has an increased carbon content at a level of 0.01% to 0.06% by weight to obtain in this way an elongated mask with a high strength and which provides a satisfactory magnetic shielding effect even when the thickness is reduced . In addition, because the elongated mask according to the present invention uses a low expansion alloy of high strength compared to. steel at low carbon, the initial tension can be reduced. In the elongated mask according to the present invention, the nickel content is preferably in the range from 35.0% to 37.0% by weight. If the nickel content is not within this range, the coefficient of thermal expansion increases unfavorably. It is necessary that the elongated mask according to the present invention contains a specific amount of carbon to increase the strength. A carbon content less than 0.01% by weight makes it impossible to obtain sufficiently high strength. A carbon content greater than 0.06% by weight damages the etching properties and
causes the amount of carbide inclusions to increase unfavorably. Silicon "forms silicate inclusions such as MnO-Si? 2 and MnO-FeO-Si02 and consequently damages the properties of the etching.Therefore, the silicon content is preferably not greater than 0.30%." Manganese content preferably It is in the range from 0.10 to 0.60% from the point of view of deoxidizing action and the prevention of hot brittleness in the steelmaking process.If the phosphorus content increases the steel hardens and the rolling characteristic of steel is degraded., the phosphorus content is preferably not higher than 0.020%. Sulfur forms sulphide inclusions and consequently damages the properties of the etching. Therefore, the sulfur content is preferably not greater than 0.020%. The present invention will be described below by way of examples.
Example 1: A 0.1 mm thick nickel-iron alloy sheet material made of material A, whose chemical composition
(% by weight) is shown in Table 1 below, was covered on both sides thereof with a protective substance of
casein soluble in water, after drying, the protective layers on both sides of the material. The sheet was stamped in the form of slots using a pair of dry glass plates with front and back patterns drawn on them, respectively. Next, the exposure, hardening and firing processes were carried out. Then, the patterned protective layer surfaces were sprayed with a ferric chloride solution with a temperature of 60 ° C and a specific gravity of 48 ° Be (Baume grade for heavy liquid as a etching liquid using a spray to perform the etching After the etching process, rinsing was carried out, and the protective layer was removed with an aqueous alkaline solution, followed by washing and drying to produce a mask for color discrimination. The following evaluation method The results of the evaluation are shown in the following table 2. In Table 2, the transmittance is the ratio (expressed as a percent) of the area of the opening to the area of a region that is between the openings at both ends.
Table 1 c If Mn P S Neither the difference Fe e
Material 0.051 0.01 0.25 0.0006 0.008 36.5 i occasional rpureness A
(Evaluation method) 1. Uniformity After the diameter of the openings has been adjusted so that the transmittance is the same as that of the mask, a visual check was made to determine whether or not there were variations in the diameter of the openings . In addition, variations in the diameter of two adjacent openings were measured. When the value of the variation was 0.80 μ or more, the uniformity of the diameter of the openings was considered bad.
2. Tensile strength The tensile strength was measured by the tensile test method defined by ISO 6892 (JIS Z2241) using a test piece shown in Figure 1. In Figure 1, the length of each portion is as follows : L (distance between signals) 50 mm P (parallel length) 60mm
R (radius of the edge) 20 mm T (thickness) thickness of the material B (fastened ends) 30 mm
3. Coercive Force He After the original sheet had been blackened by thermal treatment in the atmosphere at 670 ° C for 30 minutes, the coercive force was measured according to the method of coercive force measurement defined by JIS C2531 (sheets and strips of iron-nickel magnetic alloy) -. That is, the intensity of the magnetic field in which the. magnetic flux density in the material becomes zero, when the external magnetic field 1000 A / m applied to the material was removed and the material was magnetized in the opposite direction, was measured in the unit of A / m (ampere per meter).
Comparative Example 1 A 0.1 mm thick nickel-iron alloy sheet with a composition consisting essentially of, weight ratio, 0.003% of C, 0.01% of Si, 0.25% of Mn, 0.006% of P, 0.008% of S, 36.0% Ni, and the difference Fe and occasional impurities was etched in the same way as in Example 1 to produce a mask for color discrimination. The mask for color discrimination was evaluated
in the same way as in example 1. The results of the evaluation are shown in Table 2.
Comparative Example 2: A 0.1 mm thick nickel-iron alloy sheet with a composition consisting essentially of, weight ratio, 0.002% C, 0.01% Si, 0.20% Mn, 0.015% P, 0.007% of S and the difference Fe and occasional impurities was etched in the same manner as in Example 1 to produce a mask for color discrimination. The mask for color discrimination was evaluated in the same manner as in Example 1. The results of the evaluation are shown in Table 2.
Table 2
The elongated mask for a color picture tube according to the present invention has high strength
in comparison with the conventional nickel-iron alloy mask of little expansion and, therefore, it is capable of being elongated in the form of a steel sheet of nickel-iron alloy. In addition, because the elongated mask has a low coefficient of thermal expansion, the initial tension applied to the mask when it is lengthened can be reduced. Even when the material of the nickel-iron alloy is formed in a sheet, it provides a high magnetic shielding effect, and in this way a high quality in the presentation of the image is obtained. In addition, the steel sheet of the nickel-iron alloy has a high recrystallization temperature compared to the low carbon steel sheet. Therefore, the blackening temperature can be high. Accordingly, it is possible to form a blackened film having a higher corrosion resistance than in the case of a low carbon steel sheet.
Claims (2)
1. An elongated mask for a color image tube, the elongated mask consists of a sheet of nickel-iron alloy steel made from a nickel-iron alloy containing 35.0 to 37.0% by weight of nickel and 0.01% to 0.06% den carbon weight, the sheet of nickel-iron alloy steel being provided with holes by etching using a pattern provided on the steel sheet of the nickel-iron alloy.
2. The elongated mask according to claim 1, wherein the nickel-iron alloy steel sheet contains, based on weight, 35.0% to 37.0% nickel, 0.01% to 0.06% carbon, no more than 0.30% silicon, 0.10% to 0.60% manganese, no more than 0.020% phosphorus, no more than 0.020% sulfur and occasional impurities as different components of iron.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-121327 | 1998-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MXPA99003991A true MXPA99003991A (en) | 2000-08-01 |
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