CN1224918A - Shadow mask for cathode ray tube method manufacturing same - Google Patents
Shadow mask for cathode ray tube method manufacturing same Download PDFInfo
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- CN1224918A CN1224918A CN 99100982 CN99100982A CN1224918A CN 1224918 A CN1224918 A CN 1224918A CN 99100982 CN99100982 CN 99100982 CN 99100982 A CN99100982 A CN 99100982A CN 1224918 A CN1224918 A CN 1224918A
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- shadow mask
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Abstract
A shadow mask for a cathode ray tube (CRT) and a method of manufacturing the same. The shadow mask includes a solid solution hardening material and a precipitation hardening material. The method includes the steps of heat treating a metallic plate having a plurality of apertures formed therein using a carburizing gas, and press-forming the metallic plate into a shadow mask shape.
Description
The present invention relates to be used for the shadow mask and the manufacture method thereof of cathode ray tube.More particularly, in the shadow mask of cathode ray tube involved in the present invention and manufacture method, adopt carburization process to make shadow mask, thereby improve the hot strength and the elongation of shadow mask.
Traditional cathode ray tube (CRT) comprises: vacuum shell, comprise a screen in the vacuum shell, and have P elements array on the screen by tactic three kinds of different emission colors of cycle; Be used to produce three elements of restraining electron beams of direct directive screen; With color choice structure or shadow mask, shadow mask comprises the sheet metal with a plurality of beam holes, and it places screen and light beam to form between the element exactly.Shadow mask covers screen.The difference of convergency allows the translator unit of each light beam to excite the P elements of required emission color selectively.
Traditional CRT shadow mask is generally with following method manufacturing.At first, on the metal sheet of making by Invar or aluminum killed steel, coat photoresist.Then, make the plate exposure, develop and etching, thereby form a plurality of beam holes thereon.Then, utilize Technology for Heating Processing in the hydrogen environment of high temperature for being formed with the plate annealing of beam hole, thereby eliminate residual pressure and provide pliability for plate.Plate forms predetermined mask shape by pressure forming then, afterwards, plate is cleaned, and removes the dirt of finger mark, dust and foreign substance and so on from its surface.At last, the plate of moulding is carried out melanism handle, preventing its warpage, thereby finish the manufacturing of shadow mask.
Shadow mask plays function served as bridge between the R.G.B phosphorus pixel that forms from three electron guns (being used to form the elements of three convergence electron beams) electron beam of launching and screen, keep electron beam to fall on the correct phosphorus pixel.Therefore, shadow mask departs from its home position can change beam direction, and the phosphorus pixel is incorrect to be excited thereby make.
If shadow mask is subjected to the vibration of external impact or TV on-board speaker, shadow mask can move apart its home position in CRT.As a result, the electron beam that passes through the shadow mask of skew drops on the incorrect phosphorus pixel, thereby colour purity is degenerated.To introduce this point in detail below.
Fig. 1 is the partial sectional view of traditional CRT.Shadow mask 6 is fixed on the sidewall of panel 1.More particularly, the mask-frame 5 that links to each other with the periphery of shadow mask 6 is connected with a spring 4, and spring 4 is connected to again on the pin 3 of giving prominence to from the sidewall of panel 1.When CRT is subjected to external impact or when vibration, shadow mask 8 is vibrated and is departed from its initial position to the position 7.As a result, pass the non-predetermined hole of shadow mask 6 from electron gun 11 electrons emitted bundles.Thereby cause unsuitable phosphorus pixel to be excited.Can make the people feel that display image rocks like this causes color purity to reduce and other image quality issues.
In addition, when CRT is subjected to extreme impact, as when falling, shadow mask 6 may deform.Fig. 2 shows an example, wherein shows deformed region 12.Self-evident, this pseudo color can occur.
For correcting the problems referred to above, the open No.Sho-62-223950 of Japan's special permission discloses a kind of technology that improves the hot strength of shadow mask, and it is to form one deck coating on shadow mask.But adopt this technology, the size of beam hole will reduce.
Open No.Sho 56-121257 of Japan's special permission and Hei 1-276542 also disclose a kind of technology that improves mask tension intensity respectively, and it is that shadow mask is heat-treated under gaseous environment.But in these prior aries, owing to will carry out long heat treatment to shadow mask in manufacture process, thermal deformation can take place in shadow mask.
The present invention tries hard to address the above problem.
The shadow mask that the purpose of this invention is to provide a kind of CRT of being used for wherein can improve hot strength and elongation, thereby avoids deforming because of external impact makes shadow mask.
Another object of the present invention provides the shadow mask of a kind of CRT of being used for, wherein can improve the modulus of elasticity of shadow mask, thus the influence that makes shadow mask not be subjected to external vibration and the vibration that speaker operation caused in the system of this CRT is housed.
A further object of the present invention provides the method for the shadow mask of a kind of CRT of manufacturing, and in manufacture process, thermal deformation does not take place shadow mask.
For achieving the above object, the invention provides shadow mask and the manufacture method thereof of a kind of CRT of being used for.Have solid solution hardening material and precipitation-hardening material on this shadow mask.Manufacture method comprises the steps: to utilize carburizing gas to heat-treat the top metallic plate that is formed with several beam holes; This metallic plate is pressed into mask shape with the pressure forming method.
According to a feature of the present invention, comprise carbon in solid solution hardening material and the precipitation-hardening material.
According to another characteristic of the invention, the quantity of the carbon that shadow mask comprised accounts for 0.01 percent to percent 2.0 of shadow mask weight.
According to another characteristic of the invention, shadow mask is made by the lower material of thermal coefficient of expansion.
According to another feature of the present invention, shadow mask is made by Invar steel or aluminum killed steel.
According to another feature of the present invention, carburizing gas comprises RX gas and propane gas.
According to another feature of the present invention, heat treatment temperature is 600 to 1000 ℃.
According to another feature of the present invention, the heat treatment step time of carrying out is 0.1 to 5 hour.
Accompanying drawing is the part of book as an illustration, shows embodiments of the invention, and it and specification are used to explain principle of the present invention together.
Fig. 1 is the partial sectional view of the CRT of prior art, and the skew because of being subjected to external impact that shadow mask is taken place is shown.
Fig. 2 is the partial sectional view of the CRT of prior art, and the destruction that extreme external impact causes shadow mask is shown.
Shown in Fig. 3 is the hot strength and the elongation relation curve of the shadow mask of manufacturing when not adopting traditional annealing process.
Shown in Fig. 4 is the hot strength and the elongation relation curve of the shadow mask of manufacturing when adopting traditional annealing process.
Fig. 5 shows the hot strength and the elongation relation curve of the shadow mask that carburization process according to a preferred embodiment of the invention makes.
CRT shadow mask of the present invention is made by the lower material of thermal coefficient of expansion of aluminum killed steel or Invar steel and so on, comprises solid solution notes hardened material and precipitation-hardening material.
The method of the shadow mask of manufacturing CRT of the present invention is described below.
The metallic plate of the predetermined number of being made by the lower material of thermal coefficient of expansion such as aluminum killed steel or Invar steel is stacked on the supporting plate, has several beam holes on the presumptive area of metallic plate.Temperature with preheating furnace is set at 500 to 700 ℃ earlier, and the top supporting plate that stacks metallic plate is placed in this preheating furnace.
Then, when the temperature of reacting furnace increases to more than 150 ℃, will comprise in the carburizing gas feed-in reacting furnace of RX gas and propane gas.RX gas comprises 40% H
2, 40% N
2With 20% CO, wherein the speed injected of RX gas is 5 to 25 liters of per minutes, and the speed that propane gas is injected is 1 to 10 liter of per minute.Temperature with reacting furnace increases to 600 to 1000 ℃ then, and keeps suitable gaseous environment in reacting furnace, again the metallic plate in the preheating furnace is transferred to reacting furnace.
If the temperature of reacting furnace remains in the above-mentioned scope, RX gas and propane gas reduction, thereby the nitrogen of formation free carbon and minor amount.Free carbon and nitrogen infiltrate in the shadow mask effectively.At this moment, owing to mainly be to produce carbon, thereby the effect that is produced is almost all from the free carbon atom of infiltration, rather than nitrogen-atoms.
Carry out 0.1 to 5 hour heat treatment under the carburizing gas environment of metallic plate in reacting furnace.If heat treatment period is less than 0.1 hour, then the reaction of metallic plate and gas is insufficient.It also is unnecessary that heat treatment time surpasses 5 hours, because before this, heat treated effect has been able to abundant realization.
Preferred range about reacting furnace.If the temperature in the reacting furnace does not increase to 600 ℃ of lower limits, because the separation of gas can not take place, the heat treatment process effect is bad.Otherwise if temperature surpasses 1000 ℃, distortion can appear in shadow mask.In addition, also metallic plate directly can be put into reacting furnace, and needn't in preheating furnace, preheat earlier.But, metallic plate is put into preheating furnace earlier the temperature of metallic plate is risen gradually, and can prevent that after heat treatment process is finished temperature from sharply descending.
After carburization process is finished, the temperature of reacting furnace is reduced to 150 ℃, make the environment of reacting furnace keep current state simultaneously.When reaching this temperature, interrupt to the reacting furnace gas jet.Then, will shift out in the metallic plate autoreaction stove, and it is pressed into required mask shape.
Because the thickness of the metallic plate of formation shadow mask is limited, during fabrication, necessary repeat rolling process repeatedly.Utilize etch process after forming beam hole on the metallic plate, before metallic plate is pressed into required shape, need carry out annealing process.As shown in Figure 3, if do not implement annealing process, although the hot strength of shadow mask is very high, elongation is lower, thereby pressing metal plates can not be become required mask shape.But annealing process greatly reduces the hot strength of metallic plate, has increased elongation, as shown in Figure 4.
Therefore, in the present invention, do not adopt traditional annealing process, but adopt carburization process, both increased the hot strength of the metallic plate of making shadow mask, increased elongation yet.With regard to carburization process, the carbon monoxide that utilizes RX gas and propane gas to produce in reacting furnace is maintained at higher temperature.Carbon monoxide infiltrates or is diffused in the shadow mask, because the reaction between carbon monoxide and the shadow mask has formed Fe-Ni-C compound or Fe
3The reaction material of C and so on.With carbon compounds precipitate in the matrix of the metallic plate of making shadow mask, and make it the sclerosis.At this moment, the quantity of carbon accounts for 0.01 to 2 percent percent of shadow mask weight in the shadow mask.
From curve chart as can be seen, utilize method manufacturing of the present invention shadow mask hot strength and do not adopt the shadow mask of prior art of annealing process close, but obviously greater than the intensity (about 100MPa) of the shadow mask of the prior art after the annealing.In addition, the elongation of shadow mask of the present invention is compared slightly raising much larger than the shadow mask of the prior art that does not adopt annealing process than the shadow mask of the prior art after the annealing.
Thereby, greatly reduced the defective that shadow mask produced in various manufacturing process, and the fallen ground skew and the distortion that shadow mask are produced because of external impact.In addition, after the metallic plate of making shadow mask was heat-treated process, it was more easy to carry out rolling forming again, and the texture of formation is more even, thereby reached sufficient elongation.In addition, because the modulus of elasticity of shadow mask of the present invention increases, can reduce the vibration that produces with loud speaker of rocking of external vibration generation.
Explain the present invention in more detail below with reference to example.
Example 1
The metallic plate of predetermined number is stacked on the supporting plate, is formed with several beam holes on the presumptive area of formation beam hole portion on the metallic plate.Then, with the temperature setting of preheating furnace and remain on 650 ℃, then will above have a stacked metallic plate supporting plate put into preheating furnace.
The temperature of reacting furnace is risen to more than 150 ℃, and will comprise the carburizing gas feed-in reacting furnace of RX gas and propane gas, wherein RX gas is with the speed feed-in of 15 liters of per minutes, and propane gas is with the speed feed-in of 3 liters of per minutes.Then the temperature with reacting furnace rises to 850 ℃, and the gaseous environment in it suitably is maintained, and then, the metallic plate in the preheating furnace is forwarded in the reacting furnace.
Then, in the carburizing environment of reacting furnace, metallic plate carried out one hour heat treatment, then the temperature of reacting furnace is reduced to 150 ℃, simultaneously the environment in the reacting furnace is remained on current state.After reaching this temperature, interrupt feed gas in reacting furnace.Then metallic plate is shifted out in reacting furnace, and form required mask shape by compacting.
Found that the quantity of contained carbon is 0.01 percent of shadow mask weight in the shadow mask.
Although the present invention is described in detail, those skilled in the art should be understood that many modifications and the distortion of making according to the design of the present invention of being instructed, and will fall in the scope of appended claims.
Claims (11)
1. shadow mask, it has solid solution hardening material and precipitation-hardening material.
2. shadow mask as claimed in claim 1 is characterized in that, described solid solution hardening material and precipitation-hardening material comprise carbon.
3. shadow mask as claimed in claim 1 is characterized in that, the content of carbon accounts for 0.01 percent to percent 2.0 of shadow mask weight in the described shadow mask.
4. shadow mask as claimed in claim 1 is characterized in that, described shadow mask is made with the lower material of thermal coefficient of expansion.
5. shadow mask as claimed in claim 1 is characterized in that, described shadow mask is made by aluminum killed steel or Invar steel.
6. method of making shadow mask, it comprises the steps:
Utilize carburizing gas that top metallic plate with a plurality of beam holes is heat-treated;
Utilize pressure forming to make mask shape described metallic plate.
7. method as claimed in claim 6 is characterized in that, described shadow mask is made with the lower material of thermal coefficient of expansion.
8. method as claimed in claim 6 is characterized in that, described shadow mask is made by aluminum killed steel or Invar steel.
9. method as claimed in claim 6 is characterized in that described carburizing gas comprises RX gas and propane gas.
10. method as claimed in claim 6 is characterized in that, the temperature of described heat treatment step is 600 to 1000 ℃.
11. method as claimed in claim 6 is characterized in that, the time of carrying out heat treatment step is 0.1 to 5 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99100982 CN1224918A (en) | 1998-01-22 | 1999-01-22 | Shadow mask for cathode ray tube method manufacturing same |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1854/98 | 1998-01-22 | ||
| CN 99100982 CN1224918A (en) | 1998-01-22 | 1999-01-22 | Shadow mask for cathode ray tube method manufacturing same |
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| Publication Number | Publication Date |
|---|---|
| CN1224918A true CN1224918A (en) | 1999-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 99100982 Pending CN1224918A (en) | 1998-01-22 | 1999-01-22 | Shadow mask for cathode ray tube method manufacturing same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506647A (en) * | 2015-12-29 | 2016-04-20 | 东莞市科力钢铁线材有限公司 | Heat treatment production technology of super-malleable mild steel screw |
-
1999
- 1999-01-22 CN CN 99100982 patent/CN1224918A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506647A (en) * | 2015-12-29 | 2016-04-20 | 东莞市科力钢铁线材有限公司 | Heat treatment production technology of super-malleable mild steel screw |
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