CN1224917A - 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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- CN1224917A CN1224917A CN 99100981 CN99100981A CN1224917A CN 1224917 A CN1224917 A CN 1224917A CN 99100981 CN99100981 CN 99100981 CN 99100981 A CN99100981 A CN 99100981A CN 1224917 A CN1224917 A CN 1224917A
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- Prior art keywords
- shadow mask
- beam hole
- hole part
- aperture portion
- gas
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Abstract
A shadow mask includes an aperture portion having a plurality of apertures formed therein, the aperture portion being formed over a predetermined area in a center of the shadow mask; and a non-aperture portion defining a periphery of the shadow mask and formed adjacent to the aperture portion. A tensile strength of the aperture portionis 1.2 to 3 times greater than that of the non-aperture portion, and the modulus of elasticity of the aperture portion is 1.5 to 3 times greater than that of the non-aperture portion. The method of producing the shadow mask within an aperture portion and a non-aperture portion, includes the steps of selectively performing a heat-treating process on only the aperture portion of the shadow mask by mounting a separating cover on the non-aperture portion, the separating cover preventing contact of the non-aperture portion with the gaseous atmosphere present during the heat treating process. The shadow mask is then press-formed.
Description
The present invention relates to be used for the shadow mask and the manufacture method thereof of cathode ray tube.More particularly, the shadow mask that the present invention relates to has improved hot strength, has therefore prevented rebound phenomenon.
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 very big 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.
As a scheme that addresses the above problem, shadow mask is heat-treated, to improve its hot strength and pliability.Yet, because the modulus of elasticity of its skirt part is increased, when making the metallic plate pressure forming of shadow mask, because the angle of bend of the rebound phenomenon skirt of skirt is not the θ angle of anticipation, but θ+Δ θ angle.
The present invention tries hard to address the above problem.
A target of the present invention provides a shadow mask and a manufacture method thereof that is used for CRT, wherein, only selects the beam hole of shadow mask partly to heat-treat, thereby increases its hot strength and modulus of elasticity, therefore, can prevent that the skirt of shadow mask from rebound phenomena partly taking place.
In order to realize above-mentioned target, the invention provides a shadow mask and a manufacture method thereof that is used for CRT.Shadow mask comprises: the beam hole part, be formed with a plurality of beam holes on it, and beam hole partly is formed on the presumptive area of core of shadow mask; No beam hole part, it is adjacent with described beam hole part, and forms the periphery of shadow mask; The hot strength of beam hole part is bigger 1.2 to 3 times than no beam hole part, and it is big 1.5 to 3 times that the modular ratio of beam hole part does not have the beam hole part.
According to a feature of the present invention, the heat treatment of beam hole part is carried out in a gaseous environment, and gaseous environment comprises by RX, bright alkane, ammonia, B
2H
6And BCl
3At least a in the gas group of forming.
According to another characteristic of the invention, shadow mask is to be made by the material (preferably aluminum killed steel or Invar steel) of low thermal coefficient of expansion.
This method comprises the following steps: to be fixed on the no beam hole part by isolating lid, optionally only carries out Technology for Heating Processing on the beam hole part of shadow mask, and the isolation lid can prevent from not have the beam hole part and contact with gas in heat treatment process; With make shadow mask pressure forming.
According to a feature of the present invention, heat treatment is carried out in a gaseous environment, and gaseous environment comprises by RX, bright alkane, ammonia, B
2H
6And BCl
3At least a in the gas group of forming.
According to another characteristic of the invention, shadow mask is to be made by the material (preferably aluminum killed steel or Invar steel) of low thermal coefficient of expansion.
According to another characteristic of the invention, isolating lid is the upper and lower that is fixed on shadow mask simultaneously.
According to another characteristic of the invention, the shape and the size of isolating lid are suitable for covering fully non-perforate part, and the perforate of shadow mask is partly exposed.
Accompanying drawing is a book part as an illustration, shows one embodiment 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 traditional CRT, in order to describe since the shadow mask that external impact causes be offset;
Fig. 2 is the partial sectional view of traditional CRT, in order to describe the destruction to shadow mask that causes owing to external impact; With
Fig. 3 is the plane sketch of used isolation lid in the Technology for Heating Processing of manufacturing shadow mask of one embodiment of the present invention.
CRT shadow mask of the present invention is to be made by low thermal coefficient of expansion material (as aluminum killed steel or Invar steel).Shadow mask comprises the beam hole part and centers on the peripheral part of beam hole part or do not have the beam hole part.In shadow mask of the present invention, only to select beam hole partly to heat-treat, thereby make the hot strength of beam hole part bigger 1.2 to 3 times than no beam hole part, it is big 1.5 to 3 times that modular ratio does not have the beam hole part.
The halved tie bore portion carries out the selective thermal processing and carry out one of gas below comprising at least: RX gas in gaseous environment in gaseous environment; Bright alkane gas; Ammonia; Boron-containing gas.The material of making the beam hole part comprises a kind of element that carbon, nitrogen and boron are central at least.As for above-mentioned boron-containing gas, can use B
2H
6Or BCl
3
To introduce a kind of method of making shadow mask of the present invention in detail below.
The metallic plate of one predetermined quantity is stacked on the supporting plate, is formed with a plurality of beam holes in a presumptive area of these metallic plates, to form the beam hole part.One isolates lid is fixed on the superiors' metallic plate of lamination, but isolates the beam hole part that lid is made the exposing metal plate, covers its peripheral part simultaneously; Promptly there is not the beam hole part.After making the temperature that preheats stove be set between 100 ° to 200 ℃, the supporting plate that stacks metallic plate above is placed to and preheats in the stove.
Then, the temperature at reacting furnace is increased to after 150 ℃ the gas of adding RX gas, bright alkane gas, ammonia and/or boracic in reacting furnace.When using RX gas, it comprises 40%H
240%N
2And 20%CO; The gas of boracic is aforesaid B
2H
6Or BCl
3Temperature in the reacting furnace rises between 400～1000 ℃ then, and gaseous environment suitably is maintained, and afterwards, the metallic plate in the preheating furnace is transferred to reacting furnace.
Metallic plate heat treatment 0.1～5 hour in reacting furnace.After a scheduled time, the temperature in the reacting furnace is reduced to 150 ℃, and simultaneously, the gas in the reacting furnace keeps current state.After reaching this temperature, stop injected gas in reacting furnace.Then, metallic plate is removed from reacting furnace, isolates lid and takes away from metallic plate.Then metallic plate is pressed into required mask shape.
The beam hole of the shadow mask by the said method manufacturing and no beam hole stretching strength measurement value partly are respectively that beam hole partly is 300～500MPa, and no beam hole partly is 200～300MPa.In addition, the modulus of elasticity of beam hole part is 200～400 * 100MPa, and the modulus of elasticity of no beam hole part is 100～300 * 100MPa.Through after the Technology for Heating Processing, have only the hot strength of beam hole part and modulus of elasticity to increase, and it is unaffected not have the beam hole part.Here, the value of hot strength and modulus of elasticity only is used for showing, utilizes manufacture method of the present invention, and the value of beam hole part is higher in the middle of two measured values, rather than refers to the difference and the restriction of the characteristic of beam hole and no beam hole part.
Above showing, Fig. 3 is used for making the plane sketch of the used isolation lid of the Technology for Heating Processing of shadow mask.The present invention does not limit to isolation shown in Figure 3 lid 21, can use other structure yet, as long as they can prevent shadow mask in heat treatment process no beam hole does not partly contact with gas in the reacting furnace, beam hole is partly exposed.
As shown in the figure, isolate and to cover 21 and comprise: a pair of lower strip 21b and 21b ＇; With a pair of upper strip 21a and 21a ＇.Lower strip 21b and 21b ＇ are parallel to each other substantially, the distance that each interval is certain, and same upper strip 21a and 21a ＇ also are parallel to each other the distance that each interval is certain substantially.Lower strip 21b is vertical with 21a ＇ with upper strip 21a with 21b ＇.Between lower strip 21b and the 21b ＇ and distance between upper strip 21a and the 21a ＇ and the feasible zone that forms the skirt part of their length and width size promptly do not have beam hole and partly is capped.
In addition, at each lath 21a, 21a ＇, the end of 21b and 21b ＇ has connecting hole 23, when isolate cover 21 be placed on the laminated metal sheet after, be connected on the supporting plate by connecting hole.Therefore, with isolate cover the 21 no beam holes that are fixed on metallic plate partly after, the no beam hole part of metallic plate does not contact with gas, so should the not influence of heat-treated technology of zone, the result, the modulus of elasticity of the no beam hole of metallic plate or skirt part remains unchanged, so, can resilience after skirt partly is bent in the compression moulding process.Can comprise in the gaseous environment: RX gas; Bright alkane gas; Ammonia and boron-containing gas.Boron-containing gas can be B
2H
6Or BCl
3
Use isolation lid of the present invention as shown in Figure 3, can prevent that gas atom used in heat treatment process from the no beam hole of the metallic plate that is used for making shadow mask physics taking place partly and contacting.Therefore, the skirt of shadow mask part or do not have beam hole part its modulus of elasticity after Technology for Heating Processing and remain unchanged, thus prevent the rebound phenomenon that this is regional.
Example 1
The metallic plate of one predetermined quantity overlays on the supporting plate, is formed with a plurality of beam holes on its presumptive area, to form the beam hole part.Isolation lid of the present invention is fixed on the top of lamination of metal plates.Then, with the preheating furnace setting and remain on 150 ℃, afterwards, the supporting plate that stacks metallic plate is put into preheating furnace.
Then, after the temperature of reacting furnace increases to more than 150 ℃, feed-in RX gas, bright alkane gas, ammonia and/or boron-containing gas in reacting furnace.Wherein RX gas comprises 40%H
240%N
2And 20%Co.Then, the temperature of reacting furnace rises to 600 ℃, and gaseous environment in it is suitably maintained, and after this, the metallic plate in the preheating furnace is transferred to reacting furnace.
Metallic plate was placed 1 hour in heating reaction furnace.After one hour, the temperature in the reacting furnace is reduced to 150 ℃, simultaneously, make the gas in it remain on current state.When reaching this temperature, stop injected gas in reacting furnace.To then, metallic plate is removed from reacting furnace, and will isolate lid and unload from metallic plate.Then, pressing metal plates is configured as required shape.
In the shadow mask that uses the inventive method to make, because have only beam hole partly to be exposed in the gas in heat treatment process, no beam hole part or skirt part are blocked with contacting of gas, and the hot strength of beam hole and modulus of elasticity increase, and skirt is unaffected.As a result, when pressure forming, can prevent the resilience of skirt part.
Although described the present invention above in detail, the person skilled in art should be appreciated that in the spirit and scope of the present invention that limit in claims that the present invention can have various deformation and modification.
Claims (7)
1. shadow mask that is used for CRT comprises:
The beam hole part is formed with a plurality of beam holes on it, beam hole partly is formed on the presumptive area of core of shadow mask;
No beam hole part, it is adjacent with described beam hole part, and forms the periphery of shadow mask;
It is characterized in that the hot strength of beam hole part is bigger 1.2 to 3 times than no beam hole part, it is big 1.5 to 3 times that the modular ratio of beam hole part does not have the beam hole part.
2. a manufacturing has the method for the shadow mask of beam hole part and no beam hole part, comprising:
Be fixed on the no beam hole part by isolating lid, only the beam hole of shadow mask partly carried out Technology for Heating Processing selectively, the isolation lid can prevent from not have the beam hole part and contact with gas in heat treatment process; With make shadow mask pressure forming.
3. method as claimed in claim 2 is characterized in that Technology for Heating Processing is to carry out in gaseous environment, this gas comprises RX at least, bright alkane, ammonia, B
2H
6And BCl
6In a kind of.
4. method as claimed in claim 2 is characterized in that, shadow mask is to be made by the material of low thermal coefficient of expansion.
5. method as claimed in claim 4 is characterized in that, shadow mask is to be made by aluminum killed steel or Invar steel.
6. method as claimed in claim 2 is characterized in that, isolates lid and is fixed on simultaneously on the top and bottom of shadow mask.
7. method as claimed in claim 2 is characterized in that, makes suitable shape and size with isolating lid, to cover no beam hole part fully, the beam hole of shadow mask is partly exposed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99100981 CN1224917A (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 |
|---|---|---|---|
| KR1852/98 | 1998-01-22 | ||
| CN 99100981 CN1224917A (en) | 1998-01-22 | 1999-01-22 | Shadow mask for cathode ray tube method manufacturing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1224917A true CN1224917A (en) | 1999-08-04 |
Family
ID=5270250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99100981 Pending CN1224917A (en) | 1998-01-22 | 1999-01-22 | Shadow mask for cathode ray tube method manufacturing same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1224917A (en) |
-
1999
- 1999-01-22 CN CN 99100981 patent/CN1224917A/en active Pending
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