KR940007136B1 - Shadow mask for crt and manufacturing method for the same - Google Patents

Shadow mask for crt and manufacturing method for the same Download PDF

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Publication number
KR940007136B1
KR940007136B1 KR1019910019109A KR910019109A KR940007136B1 KR 940007136 B1 KR940007136 B1 KR 940007136B1 KR 1019910019109 A KR1019910019109 A KR 1019910019109A KR 910019109 A KR910019109 A KR 910019109A KR 940007136 B1 KR940007136 B1 KR 940007136B1
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South Korea
Prior art keywords
shadow mask
electron beam
ray tube
cathode ray
shape
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KR1019910019109A
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Korean (ko)
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KR930008926A (en
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박병수
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삼성전자 주식회사
강진구
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Priority to KR1019910019109A priority Critical patent/KR940007136B1/en
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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)

Abstract

The shadow mask for a cathode ray tube is disclosed in which a shape-memory alloy plate for shadow mask is used having a slit portion memorizing a shape with which an optimal hole for making electron beams pass through is maintained at an average temperature of thermal balance caused due to temperature raised by electron beams.

Description

음극선관용 섀도우마스크Shadow Mask for Cathode Ray Tube

도면은 본 발명을 구현하기 위해 음극선관의 내부구조를 개략적으로 도시한 단면도이다.Figure is a cross-sectional view schematically showing the internal structure of the cathode ray tube for implementing the present invention.

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

1 : 음극선관 2:전자총1: cathode ray tube 2: electron gun

3 : 패널 4 : 형광면3: panel 4: fluorescent surface

5 : 섀도우마크 R, G, B : 전자비임5: shadow marks R, G, B: electron beam

본 발명은 영상표시장치의 음극선관에 사용되는 섀도우마스크에 관한 것이다.The present invention relates to a shadow mask used in a cathode ray tube of an image display device.

영상표시장치의 음극선관은 도면에서 볼 수 있는 바와같이, 음극선관(1)의 패널부(3)의 내면에 청,녹,적의 형광체 도트(dot)로 이루어진 형광면(4)이 형성되어 있고, 이 형광면(4)에 인접하여 다수의 전자비임 투과공을 갗는 얇은 금속판으로 된 섀도우마스크가 설치되어 있다.As can be seen in the drawing of the cathode ray tube of the image display apparatus, a fluorescent surface 4 made of blue, green, and red phosphor dots is formed on the inner surface of the panel portion 3 of the cathode ray tube 1, Adjacent to the fluorescent surface 4, there is provided a shadow mask made of a thin metal plate having a plurality of electron beam transmission holes.

이러한 음극선관(1)에서 전자총(2)으로부터 전자비임(R, G, B)이 주사되면 전자비임(R,G,B)은 전자총(2)내의 다수 그 리드를 통과하면서 그리드들에 의한 일종의 "전기렌즈"작용에 의해, 섀도우마스크의 투과공을 통하여 대응하는 각 형광면(4)에 랜딩됨으로써 원하는 화상을 형성한다.When the electron beams R, G, and B are scanned from the electron gun 2 in the cathode ray tube 1, the electron beams R, G, and B pass through a plurality of grids in the electron gun 2, and thus, a kind of grid-type. By the " electrical lens " action, a desired image is formed by landing on the respective fluorescent surfaces 4 through the through holes of the shadow mask.

이때 최종적으로 형과면(4)에 도달하여 화상표시에 연결되는 전자비임은 전체 주사된 전자비임의 약 20%정도에 불과하다. 나머지 약 80%의 전자비임은 섀도우마스크의 투과공을 통과하지 못하고 그 섀도우마스크 본체에 충돌하게 된다. 이 충동에 의하여 전자비임의 운동에너지는 열에너지를 변환되어 섀도우마스크본체를 가열하게 된다.At this time, the electron beam finally reaching the mold surface 4 and connected to the image display is only about 20% of the total scanned electron beam. The remaining 80% of the electron beam does not pass through the perforations of the shadow mask, but impinges on the shadow mask body. By this impulse, the kinetic energy of the electron beam converts thermal energy to heat the shadow mask body.

이와같은 섀도우마스크본체의 가열은 음극선관에 따라 차이가 있지만 대개 상온에서 약 70℃까지의 온도상승을 가져오며, 이에 따라 섀도우마스크는 열팽창하게 된다. 이러한 열팽창에 의해 섀도우마스크는 열팽창하게 된다. 이러한 열팽창에 의해 섀도우마스크가 돔(Dome)형태로 왜곡되는 도우밍(Doming)현상이 일어나게 되며, 이에 의해 섀도우마스크 본체에의 전자비임 투과공을 상대적으로 좁아지게 된다. 이는 특히 화면의 중앙수평면 부위에 심하게 나타난다. 이에 의해 전자총(2)으로 부터 주사된 전자비임이 투과공을 통하여 힝광면에 정확히 도달할 수가 없게 된다. 이 때문에 전자비임의 랜딩(landing)이 불량하게 되어 퓨리티(purity) 가 나4진다. 이에 따라 백색균질도(White-Uniformity) 도 떨어진다.The heating of such a shadow mask body varies depending on the cathode ray tube, but usually brings about a temperature rise from room temperature to about 70 ° C. As a result, the shadow mask is thermally expanded. This thermal expansion causes the shadow mask to thermally expand. This thermal expansion causes a doming phenomenon in which the shadow mask is distorted into a dome shape, thereby narrowing the electron beam penetrating hole into the shadow mask body. This is especially true of the central horizontal plane of the screen. As a result, the electron beam scanned from the electron gun 2 cannot reach the hinting surface correctly through the transmission hole. For this reason, the landing of the electron beam becomes poor, resulting in poor purity. Accordingly, white uniformity is also reduced.

이와같은 문제점의 해결방법으로서, 섀도우마스크의 재질을 AK(Alumina killed)순철 대신에 인바(Invar)합금철을 사용하는 것이 공지되어 있다. 인바합금은 AK순철에 비해 열팽창계수는 약 1/10, 도우밍량은 약 1/4정도이다.As a solution to this problem, it is known to use Invar alloy iron instead of AK (Alumina killed) pure iron. Invar alloys have a thermal expansion coefficient of about 1/10 and a doming amount of about 1/4 compared to AK pure iron.

본 발명의 목적은 형상기억합금판으로 섀도우마크몸체를 구성함에 의해서 음극관의 형광면에 최척의 전자비임랜딩이 얻어지게 한 섀도우마스크를 제공하는데에 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a shadow mask in which the best electron beam landing is obtained on the fluorescent surface of the cathode tube by constructing the shadow mark body from the shape memory alloy plate.

상기 목적을 달성하기 위한 본 발명의 특징은 영상표시장치의 음극선 형광면에 인접되게 이격 배치되면, 주사되는 전자비임에 의해 상기 형광면에 영상을 맺게하는 음극선관용 섀도우마스크에 있어서, 전자비임에 의한 온도상승으로 인해 열적평형을 이루는 평균온도에서도, 전자비임이 통과되는 최적의 구멍을 유지하는 형상을 기억시킨 슬릿부를 갖는 형상기억합금판체로 구성됨을 특징으로 하는 섀도우마스크에 있다.A feature of the present invention for achieving the above object is a shadow mask for a cathode ray tube which forms an image on the fluorescent surface by scanning electron beam when spaced apart adjacent to the cathode fluorescent surface of the image display device, the temperature rise by the electron beam Due to this, the shadow mask is characterized in that it is composed of a shape memory alloy plate body having a slit portion that stores a shape that maintains an optimal hole through which an electron beam passes even at an average temperature of thermal equilibrium.

이하에서 첨부도면을 참조해서 본 발명의 보다 바람직한 실시예를 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, a more preferred embodiment of the present invention will be described in detail.

본 발명에 따른 섀도우마스크(5)는 형상기억합금에 의해 판형상을 이루게 제조되며, 상기 형상기억합금판에는 전자총(2)으로부터 주사된 전자비임(R, G, B)이 충돌하여 가열되었을 때의 온도에서도 전자비임이 투과 될 수 있게 되는 일정 구멍를 유지할 수 있게 한 형상을 기억시킨 수개의 전자비임투과용 슬릿부(5a)가 형성되어 있다.The shadow mask 5 according to the present invention is manufactured to form a plate shape by a shape memory alloy, and when the electron beams R, G, and B scanned from the electron gun 2 collide with each other, the shape memory alloy plate is heated. Several electron beam transmission slit portions 5a are formed in which a shape capable of maintaining a constant hole through which electron beams can be transmitted even at a temperature of?

이와 같은 형상기억합금체로 된 섀도우마스크(5)를 향하여 전자비임(R, G, B)이 주사되면, 섀도우마스크(5)의 슬릿부(5a)를 통과하지 못하고 섀도우마스크 본체에의 차단부(5b)에 충돌하는 전자비임(R, G, B)에 의하여 섀도우마스크(5)는 가열되어, 열적변형이 일어나게 된다. 약 20-30분의 일정시간이 지나면 섀도우마스크(5)의 온도는 거의 일정하게 유지되어 열적평형상태를 이루게 된다. 이 온도는 통상 상온에서 약 70℃ 정도이다.When the electron beams R, G, and B are scanned toward the shadow mask 5 made of such a shape memory alloy, it is not allowed to pass through the slit portion 5a of the shadow mask 5, but is blocked by the shadow mask body ( The shadow mask 5 is heated by the electron beams R, G, and B colliding with 5b), and thermal deformation occurs. After a certain time of about 20-30 minutes, the temperature of the shadow mask (5) is maintained almost constant to achieve a thermal equilibrium state. This temperature is about 70 degreeC normally.

이러한 온도에서도 섀도우마스크(5)의 형상기억합금판체에 설치된 슬릿부(5a)는 항시 일정구멍를 유지할수 있게 한 형상기억에 의해, 전자비임이 형광면(4)으로 정확히 도달할 수 있게 한다. 이로 인해 형광면(4)에는 최적의 전자비임랜딩이 있게 되고, 이에 따라서 음극선관의 올화이트패턴 비디오(All Whit Pattern Video)수상시 중앙부에 대한 주변부의 백색비율을 나타내는 백색균질도가 양호하게 된다.Even at such a temperature, the slit portion 5a provided in the shape memory alloy plate body of the shadow mask 5 allows the electron beam to accurately reach the fluorescent surface 4 by the shape memory which can maintain a constant hole at all times. As a result, there is an optimal electron beam landing on the fluorescent surface 4, and thus, a good white homogeneity indicating a white ratio of the peripheral portion to the center portion when the All White Pattern Video of the cathode ray tube is received.

이상과 같이, 본 발명은 형상기억합금판에 의한 섀도우마스크의 구성으로 전자비임의 랜딩을 양호하게하고, 이에 따라 백색균질도를 향상시킨 효과가 있다.As described above, the present invention has the effect of improving the landing of the electron beam by the configuration of the shadow mask by the shape memory alloy plate, thereby improving the white homogeneity.

Claims (1)

영상표시장치의 음극선관용형광면에 인접되게 이격 배치되며, 주사되는 전자비임에 의해 상기 형광면에 영상을 맺게 하는 음극선관용 섀도우마스크에 있어서, 전자비임에 의한 온도상승으로 인해 열적평형을이루는 평균온도에서도, 전자비임이 통과되는 최적의 구명을 유지하는 형상을 기억시킨 슬릿부를 갖는 형상기억합금판체로 구성됨을 특징으로 하는 섀도우마스크.In the shadow mask for cathode ray tube which is disposed adjacent to the cathode ray tube fluorescent surface of the image display device and forms an image on the fluorescent surface by the electron beam to be scanned, even at the average temperature of thermal equilibrium due to the temperature rise by the electron beam, A shadow mask comprising a shape memory alloy plate body having a slit portion for storing a shape for maintaining an optimal lifesaving electron beam.
KR1019910019109A 1991-10-30 1991-10-30 Shadow mask for crt and manufacturing method for the same KR940007136B1 (en)

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Application Number Priority Date Filing Date Title
KR1019910019109A KR940007136B1 (en) 1991-10-30 1991-10-30 Shadow mask for crt and manufacturing method for the same

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Application Number Priority Date Filing Date Title
KR1019910019109A KR940007136B1 (en) 1991-10-30 1991-10-30 Shadow mask for crt and manufacturing method for the same

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KR930008926A KR930008926A (en) 1993-05-22
KR940007136B1 true KR940007136B1 (en) 1994-08-06

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