KR940007246B1 - Manufacturing method for shadow mask - Google Patents

Manufacturing method for shadow mask Download PDF

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KR940007246B1
KR940007246B1 KR1019920001778A KR920001778A KR940007246B1 KR 940007246 B1 KR940007246 B1 KR 940007246B1 KR 1019920001778 A KR1019920001778 A KR 1019920001778A KR 920001778 A KR920001778 A KR 920001778A KR 940007246 B1 KR940007246 B1 KR 940007246B1
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shadow mask
powder
film
electron gun
thermal
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KR1019920001778A
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Korean (ko)
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KR930018629A (en
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오종호
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삼성전관 주식회사
김정배
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06Screens for shielding; Masks interposed in the electron stream
    • H01J29/07Shadow masks for colour television tubes

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  • Electrodes For Cathode-Ray Tubes (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The process comprises the steps of producing a spray liquid by mixing 10-25 wt.% of water glass and lignin-type dispersant to 15-309 wt.% of BiO2 powder and 1-20 wt.% of secondary metal powder or secondary metal oxide powder and pulverizing thereof; spraying the spray liquid on the surface of the shadow mask at the side of an electron gun and drying thereof to form a film; and calcining the shadow mask on which the film is formed at about 450 deg.C to form a compound of a certain thickness on the surface of the shadow mask and form a blacking film.

Description

섀도우마스크의 제조방법Method of manufacturing shadow mask

제1도는 통상적인 음극선관의 구성을 도시한 개략단면도.1 is a schematic cross-sectional view showing the configuration of a conventional cathode ray tube.

제2도는 본 발명에 따른 섀도우마스크의 피막두께와 써멀드리프트량의 관계를 도시한 그래프.2 is a graph showing the relationship between the film thickness and the thermal drift amount of the shadow mask according to the present invention.

* 도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

1 : 섀도우마스크 2 : 전자총1: shadow mask 2: electron gun

3 : 패널3: panel

본 발명은 섀도우마스크의 제조방법에 관한 것으로, 특허 전자비임의 반사효과 및 열복사율을 증대시켜 섀도우마스크의 열팽창을 극소화함으로써 고품질의 음극선관을 제조할 수 있도록 한 섀도우마스크의 제조방법에 관한 것이다.The present invention relates to a method of manufacturing a shadow mask, and to a method of manufacturing a shadow mask, which is capable of producing a high quality cathode ray tube by minimizing thermal expansion of a shadow mask by increasing the reflection effect and thermal radiation rate of a patented electron beam.

일반적으로 음극선관에서는 제1도에 도시된 바와 같이 섀도우마스크(1)가 전자총(2)에서 방사되는 점자비임을 홈(3)을 통해 분리시켜 패널(4)의 내면에 형성된 소정 형광체에 도달하도록 하는 색선별 기능을 하고 있는 바, 이때 섀도우마스크(1)에는 전자총(2)에서 방사되는 전자비임의 약 80%가 충돌되면서 전자가 갖고 있던 운동에너지가 열에너지로 변환되게 되어 그 온도가 상승하게 되고, 이에 따라 섀도우마스크(l)가 패널(4)쪽으로 팽창하게 되는 도밍현상이 발생하게 되어 섀도우마스크(1)의 홀(3)을 통과한 전자비임의 도달경로에 오차가 생기게 됨으로써 써멀드리프트 현상이 발생하게 된다.In general, in the cathode ray tube, as shown in FIG. 1, the shadow mask 1 separates the braille beam radiated from the electron gun 2 through the groove 3 to reach a predetermined phosphor formed on the inner surface of the panel 4. In this case, the shadow mask 1 collides with about 80% of the electron beam emitted from the electron gun 2, and the kinetic energy of the electrons is converted into thermal energy, thereby increasing its temperature. As a result, a dominant phenomenon in which the shadow mask l expands toward the panel 4 is generated and an error occurs in the path of arrival of the electron beam passing through the hole 3 of the shadow mask 1, thereby causing a thermal drift phenomenon. Will occur.

이와 같은 써멀드리프트 현상을 최소화하기 위해 종래에도 게터플래싱 또는 스프레이법으로 기공부품을 흑화시키기 위한 여러가지 기술이 제안되어 있는 바, 예컨대 일본국 특허공개 소64-81139호에는 Bi2O3분말에다 Bi2O3이외의 금속분말 포는 그 금속산화물 분말과 물유리 및 물을 혼합하여 현탁액을 만들고, 이 현탁액을 섀도우마스크 표면에 스프레이 도포한 후 건조·소성시킴으로써 소정 두께의 피막을 형성시키도록 되어 있으나, 이는 상기 피막이 일부 전자비임 반사 효과를 가져오기는 하나 피막이 완전히 흑화되지 않고 황색을 띠게 됨으로 인하여 열복사율이 낮아 섀도우마스크의 열변형에 따른 써멀드리프트 현상을 감소시키는 효과가 적다는 결점이 있다.In order to minimize such thermal drift, various techniques have been proposed to blacken the pores by the getter flashing or spray method. For example, Japanese Patent Application Publication No. 64-81139 discloses Bi 2 O 3 powder and Bi 2. Metal powders other than O 3 are mixed with the metal oxide powder, water glass and water to form a suspension, which is spray-coated to the shadow mask surface, followed by drying and firing to form a film having a predetermined thickness. Although the film has an electron beam reflection effect, the film is not completely blackened and becomes yellow, so that the thermal radiation rate is low, thereby reducing the thermal drift due to thermal deformation of the shadow mask.

이에 본 발명은 상기와 같은 결점을 해결하기 위하여 발명된 것으로, 본 발명의 목적은 섀도우마스크의 전자총쪽 표면에 흑화피막을 형성시켜 전자비임의 반사효과 및 열복사율을 증대시킴으로써 섀도우마스크의 열팽창에 따른 써멀드리프트 현상을 극소화하여 고품질의 음극선관을 제조할 수 있도록 한 섀도우마스크의 제조방법을 제공하는 것이다.Accordingly, the present invention has been invented to solve the above drawbacks, and an object of the present invention is to form a blackening film on the surface of the electron gun of the shadow mask, thereby increasing the reflection effect and thermal radiation rate of the electron beam, resulting in thermal expansion of the shadow mask. The present invention provides a method of manufacturing a shadow mask that minimizes the thermal drift to produce a high quality cathode ray tube.

상기와 같은 목적을 달성하기 위한 본 발명은, Bi2O3분말 15-30wt%와 제2금속분말 또는 제2금속산화물 분말 1-20wt%에 물유리 10-25wt%와 리드닌(Lignin)계 분산제(미국 Lignotech사 제로)와 물(H2O)을 혼합하여 분쇄시킴으로써 스프레이액을 제조하는 단계와, 이 스프레이액을 섀도우마스크의 전자총쪽 표면에 분사하고 건조시져 피막을 형성하는 단계 및, 피막이 형성된 섀도우마스크를 약 450℃ 온도로 소성하여 섀도우마스크의 표면에 소정 두께의 혹화물질을 형성하는 단계로 이루어져 있다.The present invention for achieving the above object, 15-30wt% of Bi 2 O 3 powder and 1-25wt% of the second metal powder or the second metal oxide powder 10-25wt% water and leadin (Lignin) dispersant (Manufactured by Lignotech, USA) and water (H 2 O) to prepare a spray liquid by pulverizing, spraying the spray liquid on the electron gun side of the shadow mask and dried to form a film, and The shadow mask is fired at a temperature of about 450 ° C. to form a material having a predetermined thickness on the surface of the shadow mask.

따라서 이와 같은 방법으로 구성된 본 발명은, 섀도우마스크의 피막에 형성된 Bi2O3에 의한 전자비임 반사효과와 Bi2O3와 제2금속분말과의 화합물인 흑화물질의 흑화효과로 인하여 섀도우마스크의 열복사율을 증대시킴으로써 섀도우마스크의 열변형에 따른 써멀드리프트량을 극소화하여 고품질의 음극선관을 제조할수 있도록 되어 있다.Therefore, this invention is configured in such a way, due to the Bi 2 O 3 electron beam reflecting effect and Bi 2 O 3 and a blackening effect of the blackening compound with the second metal powder according to the formed coating film of the shadow mask of a shadow mask By increasing the thermal radiation rate, the thermal drift due to thermal deformation of the shadow mask can be minimized to produce a high quality cathode ray tube.

이하 본 발명을 첨부된 예시도면에 의거 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[실시예 1]Example 1

Bi2O3분말 25wt%와 제2금속분말, 본 실시예 1에서 Fe분말 5wt%에 28%의 고체성분을 갖는 물유리20wt%와 리그닌계 분산제 1wt%와 물 49wt%를 볼밀에 넣고, 약 1-3일간 혼합·분쇄하여 스프레이 현탁액을 제조하고, 이 스프레이액을 섀도우마스크의 전자총쪽 표면에 분사하여 건조시킴으로써 약 2-4μm정도 두께의 피막을 형성한다In a ball mill, 25 wt% of Bi 2 O 3 powder and a second metal powder, 20 wt% of water glass having a solid component of 28% to 5 wt% of Fe powder, 1 wt% of lignin-based dispersant and 49 wt% of water were placed in a ball mill. Mix and grind for 3 days to produce a spray suspension, and spray the spray liquid onto the electron gun side of the shadow mask to dry to form a film having a thickness of about 2-4 μm.

이어 피막이 형성된 섀도우마스크를 약 450°온도의 습식 소성로에 투입하여 소성 작업을 실시하는 바, 이때 섀도우마스크에 도포된 피막에 항유된 Fe가 산화되어 Fe3O4형태로 Bi2O3에 고용되면서 Bi2Fe4Og인화합물이 형성되고 섀도우마스크는 흑화되어진다. 여기서 이 화합물은 섀도우마스크와의 친화력이 높아 부착력이 우수함과 더불어 섀도우마스크의 전자총쪽 표면을 흑화시킴으로써 전자총에서 방사되는 전자비임의 열복사율을 증대시키게 되고, 또 상기 Bi2O₃가 전자비임 반사효과를 갖고 있음으로 해서 섀도우마스크의 온도상승에 따른 열변형을 감소시켜 써멀드리프트량을 감소시킬 수 있게 된다.Subsequently, the formed shadow mask was put into a wet firing furnace having a temperature of about 450 ° and firing was performed. At this time, Fe contained in the film coated on the shadow mask was oxidized to be dissolved in Bi 2 O 3 in the form of Fe 3 O 4 . A compound that is Bi 2 Fe 4 Og is formed and the shadow mask is blackened. Here, the compound has high affinity with the shadow mask, and thus has excellent adhesion, and increases the thermal radiation rate of the electron beam emitted from the electron gun by darkening the surface of the electron gun side of the shadow mask, and the Bi 2 O₃ has an electron beam reflection effect. By having it, it is possible to reduce the amount of thermal drift by reducing the thermal strain caused by the temperature rise of the shadow mask.

즉 제2도에 도시된 바와 같이, 본 발명 방법을 적용하여 섀도우마스크에 형성된 피막의 두께를 2μm,3μm,4μm으로 각각 변화시킴에 따라 써멀드리프트량이 38μm,36μm,33μm으로 각각 감소될을 알 수 있는바, 이는 종래 기술에서의 45/'m.40μm,37μm에서 보다 써멀드리프트량을 크게 감소시킬 수 있음을 보여주고 있다.That is, as shown in Figure 2, by applying the method of the present invention by changing the thickness of the film formed on the shadow mask to 2μm, 3μm, 4μm respectively, it can be seen that the amount of thermal drift is reduced to 38μm, 36μm, 33μm respectively This shows that the amount of thermal drift can be greatly reduced than at 45 / 'm. 40 µm and 37 µm in the prior art.

[실시예 2]Example 2

Bi2O3분말 25wt%와 제2금속산화물 분말, 본 실시예 2에서는 CuO분말 10wt%에 28%의 고체성분을 갖는 물유리 20wt%와 리그닌계 분산제 1wt%와 물 44wt%를 볼밀에 넣고, 약 1-3일간 혼합·분쇄하여 스프레이 현탁액을 제조한 다음, 이 스프레이액을 섀도우마스크의 전자총쪽 표면에 분사하여 건조시킴으로써 약 2-4μm 정도 두께의 피막을 형성한다.25 wt% of Bi 2 O 3 powder and a second metal oxide powder, in this Example 2, 20 wt% of water glass having a solid component of 28% to 10 wt% of CuO powder, 1 wt% of lignin-based dispersant and 44 wt% of water were placed in a ball mill. After mixing and pulverizing for 1-3 days to prepare a spray suspension, the spray liquid is sprayed onto the electron gun side of the shadow mask and dried to form a film having a thickness of about 2-4 μm.

이어 피막이 형성된 섀도우마스크를 약 450℃ 온도의 건식 소성로에 투입하여 소성작업을 실시하게 되면, 피막을 함유한 CuO가 Bi2O3에 고용되면서 흑화물질을 형성하게 되고, 이에 따라 섀도우마스크의 전자총쪽 표면이 흑화되게 된다.Subsequently, when the shadowed mask is formed into a dry firing furnace having a temperature of about 450 ° C. and fired, the film-containing CuO is dissolved in Bi 2 O 3 to form a blackening material, and thus the electron gun side of the shadow mask. The surface becomes black.

이와 같이 제조된 본 실시예 2에 따른 섀도우마스크는, 제2도에 도시된 바와 같이 그 피막 두께를 2μm,3μm,4μm으로 각각 변화시켜 형성시킴에 따라 써멀드리프트량이 40μm,37μm,35μm으로 각각 감소될을 알 수 있는바, 이는 실시예 1보다는 써멀드리프트량이 약간 크기는 하나 종래 기술에 비해서는 상당히 감소된 것임을 알 수 있다.The shadow mask according to the second embodiment prepared as described above is formed by changing the thickness of the film into 2 μm, 3 μm, and 4 μm, respectively, as shown in FIG. 2. As a result, the amount of thermal drift is reduced to 40 μm, 37 μm, and 35 μm, respectively. As can be seen, this shows that the thermal drift amount is slightly larger than that of Example 1, but is considerably reduced compared to the prior art.

이상의 설명에서와 같이 본 발명은, Bi2O3분말에 소정량의 Fe 분말 또는 CuO 분말을 혼합하여 제조한 스프레이액을 섀도우마스크에 도포·소성시킴에 따라 섀도우마스크의 친화력이 크고 열복사 효과가 우수한 흑화물질이 얻어지게 되어 Bi?/SB>?SB>O₃의 전자비임 반사효과와 함께 섀도우마스크의 열변형에 따른 써멀드리프트량을 극소하시켜 고품질의 섀도우마스크를 제조할 수 있는 효과가 있다.As described above, according to the present invention, the spray solution prepared by mixing a predetermined amount of Fe powder or CuO powder with Bi 2 O 3 powder is applied to the shadow mask and fired, so that the shadow mask has a high affinity and excellent heat radiation effect. The blackening material is obtained, and the effect of reflecting the electron beam of Bi ? / SB>? SB> O₃ and minimizing the amount of thermal drift due to thermal deformation of the shadow mask has the effect of producing a high quality shadow mask.

Claims (4)

Bi2O3분말 15-30wt%와 제2금속분말 또는 제2금속산화물 분말 1-20wt%에 물유리 10-25wt%와 리그닌계 분산제와 물을 혼합하여 분쇄시킴으로써 스프레이액을 제조하는 단계와, 이 스프레이액을 섀도우마스크의 전자총쪽 표면에 분사하고 건조시켜 피막을 형성하는 단계 및, 피막이 형성된 섀도우마스크를 약450℃ 온도로 소성하여 섀도우마스크의 표면에 소정 두께의 화합물을 생성하고 흑화막을 형성하는 단계로이루어진 섀도우마스크의 제조방법.Preparing a spray solution by pulverizing 15-30 wt% of Bi 2 O 3 powder, 1-25 wt% of the second metal powder or 1-20 wt% of the second metal oxide powder, water glass, 10-25 wt% of the lignin-based dispersant and water; Spraying the spray liquid onto the electron gun side of the shadow mask and drying the film to form a film; and firing the film formed shadow mask at a temperature of about 450 ° C. to form a compound having a predetermined thickness on the surface of the shadow mask and forming a black film. Method for producing a shadow mask made of. 제1항에 있어서, 상기 제2금속분말이 Fe 분말로 이루어진 것을 특징으로 하는 섀도우마스크의 제조방법.The method of claim 1, wherein the second metal powder is made of Fe powder. 제1항에 있어서, 상기 제2금속산화물 분말이 CuO 분말로 이루어진 것을 특징으로 하는 섀도우마스크의 제조방법.The method of claim 1, wherein the second metal oxide powder is a CuO powder. 제1항에 있어서, 상기 화합물이 Bi2Fe4O9으로 이루어진 것을 특징으로 하는 섀도우마스크의 제조방법.The method of claim 1, wherein the compound is made of Bi 2 Fe 4 O 9 .
KR1019920001778A 1992-02-07 1992-02-07 Manufacturing method for shadow mask KR940007246B1 (en)

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Publication number Priority date Publication date Assignee Title
WO2003096371A3 (en) * 2002-05-07 2004-04-15 Thomson Licensing Sa Method for making a colour-selection mask for cathode ray tube

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KR20210150651A (en) * 2020-06-03 2021-12-13 삼성디스플레이 주식회사 Method of fabricating cover window, cover window and display device comprising the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003096371A3 (en) * 2002-05-07 2004-04-15 Thomson Licensing Sa Method for making a colour-selection mask for cathode ray tube

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