KR20010010957A - Cathode for cathode ray tube to improve the characteristics of even electron-emission and its manufacturing method - Google Patents

Cathode for cathode ray tube to improve the characteristics of even electron-emission and its manufacturing method Download PDF

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KR20010010957A
KR20010010957A KR1019990030117A KR19990030117A KR20010010957A KR 20010010957 A KR20010010957 A KR 20010010957A KR 1019990030117 A KR1019990030117 A KR 1019990030117A KR 19990030117 A KR19990030117 A KR 19990030117A KR 20010010957 A KR20010010957 A KR 20010010957A
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South Korea
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electron
material layer
cathode
emitting material
electron emission
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KR1019990030117A
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Korean (ko)
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이성률
권기진
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김영남
오리온전기 주식회사
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Publication of KR20010010957A publication Critical patent/KR20010010957A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/04—Cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems

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  • Solid Thermionic Cathode (AREA)

Abstract

PURPOSE: A cathode for a CRT and a producing method thereof are provided to uniformly emit electron, to improve electron emitting characteristic and lifespan, to improve focusing characteristic, and to repress generation of moire by reducing surface roughness of an electron emitting layer. CONSTITUTION: An electron emitting material layer(21) is formed on a base metal to emit electron. A fine electron emitting material layer(24) is formed by using electron emitting material having finer fineness than the material composing the electron emitting material layer. Thus, surface roughness of the electron emitting layer is improved. Herein, thickness of the electron emitting layer is 60-75 micrometers while forming the fine electron emitting layer for 1-6 micrometers. Herein, fineness of material for the fine electron emitting layer is approximately 1 micrometer.

Description

균일한 전자방출특성을 향상시킨 음극선관의 캐소드와 그 제조방법{CATHODE FOR CATHODE RAY TUBE TO IMPROVE THE CHARACTERISTICS OF EVEN ELECTRON-EMISSION AND ITS MANUFACTURING METHOD}Cathode of cathode ray tube with uniform electron emission characteristics and its manufacturing method {CATHODE FOR CATHODE RAY TUBE TO IMPROVE THE CHARACTERISTICS OF EVEN ELECTRON-EMISSION AND ITS MANUFACTURING METHOD}

본 발명은, 균일한 전자방출특성을 향상시킨 음극선관의 캐소드와 그 제조방법에 관한 것으로, 더상세하게는 전자방출을 보다 균일하게 할 수 있고, 전자방출특성과 수명을 향상시킬 수 있으며, 표면거칠기를 감소시켜 포커스특성의 개선과 모아레 발생의 억제를 도모한 균일한 전자방출특성을 향상시킨 음극선관의 캐소드와 그 제조방법에 관한 것이다.The present invention relates to a cathode of a cathode ray tube with improved electron emission characteristics and a method of manufacturing the same. More specifically, the electron emission can be made more uniform, and the electron emission characteristics and lifetime can be improved. The present invention relates to a cathode ray tube cathode and a method of manufacturing the same, which improve the uniform electron emission characteristic to reduce the roughness and to improve focus characteristics and suppress moire generation.

기존의 기저금속(13)은, 도 1에 도시된 바와 같이 Mg, Si을 포함한 Ni 금속판을 디스크형으로 가공하여 제작되며, 탄산염층의 코팅전에 스퍼터링에 의하여 환원제층인 금속층(12)을 기저금속(13) 위에 형성하기도 하고 수명증대를 위하여 기저금속(13) 상부에 형성되는 부도체 중간층의 저항을 낮추는 역할을 하는 탄산염과 환원제 혼합층을 기저금속(13) 표면에 형성하거나 그 기저금속(13) 위에 탄산염층을 코팅하여 전자방출물질층(11)을 형성하기도 한다.The existing base metal 13 is manufactured by processing a Ni metal plate including Mg and Si into a disc shape, as shown in FIG. 1, and the base metal 13 as a reducing agent layer by sputtering before coating the carbonate layer. (13) Forming a layer of carbonate and reducing agent on the surface of the base metal (13) or on the base metal (13), which may be formed on the base metal (13) and lower the resistance of the insulator intermediate layer formed on the base metal (13) for longer life. The carbonate layer may be coated to form the electron emission material layer 11.

이때, Si, Mg 등의 환원제를 0.01-0.09 w.t.%정도 포함하는 Ni 기체 위에 바인더와 혼합된 BaCO3, SrCO3, CaCO3등의 탄산염층을 그 위에 주로 스프레이에 의해서 형성되게 되는데, 그 전자방출물질층(11)의 표면의 기하학적인 구조는 포커싱 특성에 큰 영향을 미치게 된다.At this time, a carbonate layer such as BaCO 3 , SrCO 3 , CaCO 3 mixed with a binder is mainly formed on the Ni gas containing a reducing agent such as Si, Mg, etc. about 0.01-0.09 wt%, and the electron is emitted. The geometry of the surface of the material layer 11 has a great influence on the focusing properties.

즉, 전자방출물질층(11)의 표면거칠기가 커지면 전자방출물질층 표면 위치에 따른 전자방출의 선속도의 편차가 커지고 전자방출분포의 편차가 커져 포커싱 특성이 저하하게 된다는 문제가 있다.That is, when the surface roughness of the electron emission material layer 11 is increased, the deviation of the linear velocity of electron emission according to the position of the electron emission material layer is increased, and the deviation of the electron emission distribution is increased, thereby deteriorating focusing characteristics.

또한, 모아레 현상은 섀도우마스크의 피치 설게, 전자빔 형상, D/Y의 주사주파수에 따라 영향을 받게 된다. 엔.쉬라마쯔(N. Shiramatsu) 등은 "인포메이션 디스플레이(Information Display) 6호"(1994년 발간) 12-16페이지에서 음극형상을 평탄하고 매끈하게 함으로써 전자빔형상을 수정하여 모아레를 감소시킨 것으로 보고하고 있고, 또한, 케이. 쵸우(K. Chou) 등은 IDW 98 457페이지에서 전자빔형상을 수정하여 모아레 현상을 모아레가 발생하는 최소휘도의 개념을 도입하여 정량화하였는데, 모아레는 낮은 휘도에서 흔히 발생하다가 휘도를 높이면 사라지게 되는데 모아레는 표면거칠기가 거칠수록 낮은 휘도에서 더 많이 관찰되는 것으로 보고하였다.In addition, the moiré phenomenon is affected by the pitch of the shadow mask, the shape of the electron beam, and the scanning frequency of D / Y. N. Shiramatsu et al. Reported that in the Information Display No. 6 (published in 1994) on pages 12-16, the moire was reduced by modifying the electron beam shape by making the cathode shape flat and smooth. And also, K. K. Chou et al., On page 457 of IDW 98, modified the electron beam shape to quantify the moiré phenomena by introducing the concept of the minimum luminance at which moiré occurs. It is reported that the rougher the surface roughness, the more observed at low luminance.

또한, 캐소드 전자방출층의 표면거칠기를 개선하고자 하는 시도는 IDW 98에서 케이. 쵸우 등에 의해 보고되었는데 전자방출층의 표면거칠기의 차이를 두어 포커싱 특성과 모아레 특성을 분석하기 위해 프레스로 전자방출층을 눌러서 전자방출층을 제작하여 평균거칠기가 0.5㎛에서 5㎛까지의 샘플을 제작하였으며, 이때, 2㎛이하의 경우는 거칠기가 낮아지더라도 포커싱 특성의 개선이 없었지만 2㎛까지는 특성의 개선이 있었다.In addition, attempts to improve the surface roughness of the cathode electron-emitting layer have been described in K. It was reported by Chow et al., In order to analyze the focusing characteristics and moiré characteristics by the difference of the surface roughness of the electron emitting layer, an electron emitting layer was produced by pressing the electron emitting layer with a press to produce a sample having an average roughness of 0.5 μm to 5 μm. In this case, in the case of 2 μm or less, there was no improvement in focusing characteristics even though the roughness was lowered, but there was an improvement in characteristics up to 2 μm.

그러나, 위의 방법은 다음과 같은 결점을 가진다. 즉, 캐소드의 전자방출층은 일정한 코팅밀도로 형성되어야 하며, 그렇지 않고 밀도가 필요이상으로 높을 시에는 유리 Ba의 공급이 원활하지 않아 전자 방출 특성의 열화가 빨리 일어나게 되고 결국은 캐소드의 수명에 영향을 주게 된다. 따라서 프레스로 눌러서 제작된 캐소드 전자 방출층은 수명특성에 치명적이다.However, the above method has the following drawbacks. That is, the electron-emitting layer of the cathode should be formed with a constant coating density. Otherwise, when the density is higher than necessary, the glass Ba is not supplied smoothly, resulting in rapid deterioration of electron emission characteristics and ultimately affecting the lifetime of the cathode. Will be given. Therefore, the cathode electron emission layer fabricated by pressing is deadly in the life characteristics.

따라서, 본 발명은 상술한 문제를 해결하기 위한 것으로, 전자방출층의 표면거칠기를 줄임으로써 전자방출을 보다 균일하게 할 수 있고, 전자방출특성과 수명을 향상시킬 수 있으며, 포커싱 특성을 개선함과 동시에 모아레 발생을 억제할 수 있는 균일한 전자방출특성을 향상시킨 음극선관의 캐소드와 그 제조방법을 제공하는 것을 목적으로 한다.Accordingly, the present invention is to solve the above-described problem, by reducing the surface roughness of the electron emission layer can be more uniform electron emission, improve the electron emission characteristics and lifetime, and improve the focusing characteristics and At the same time, an object of the present invention is to provide a cathode of a cathode ray tube with a uniform electron emission characteristic capable of suppressing moiré generation and a method of manufacturing the same.

도 1은 종래의 캐소드의 전자방출물질층의 구조를 도시한 부분단면도,1 is a partial cross-sectional view showing the structure of an electron emitting material layer of a conventional cathode;

도 2는 본 발명의 일실시예에 따다 자유낙하에 의해 전자방출물질 분말을 자유 낙하시켜 자유낙하 전자방출층르 형성하는 과정을 설명하기 위한 개략 부분단면도,2 is a schematic partial cross-sectional view for explaining a process of forming a free-falling electron-emitting layer by free-falling the electron-emitting material powder by free fall according to an embodiment of the present invention;

도 3은 도 2의 음극선관의 캐소드의 제조과정에 의해 제조된 캐소드의 표면의 형상을 설명하기 위한 개략 부분단면도.3 is a schematic partial cross-sectional view for explaining the shape of the surface of the cathode produced by the manufacturing process of the cathode of the cathode ray tube of FIG.

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

10: 캐소드 11,21: 전자방출물질층10: cathode 11,21: electron emitting material layer

12: 금속층 13,23: 기저금속12: metal layer 13,23: base metal

24: 미세전자방출물질층 30: 스프레이장치24: fine electron emission material layer 30: spray device

상술한 본 발명의 목적을 달성하기 위한 본 발명의 일실시예에 따른 균일한 전자방출특성을 향상시킨 음극선관의 캐소드는, 기저금속 위에 전자방출물질층을 형성하여 전자를 방출시키기 위한 음극선관의 캐소드에 있어서, 표면거칠기를 향상시키기 위해 상기 전자방출물질층을 형성하는 전자방출물질의 입도보다 미세한 입도의 전자방출물질에 의해 코팅된 미세전자방출물질층이 상기 전자방출물질층의 표면에 형성된 것을 특징으로 한다.Cathode of the cathode ray tube to improve the uniform electron emission characteristics according to an embodiment of the present invention for achieving the above object of the present invention, by forming an electron emission material layer on the base metal to emit electrons In the cathode, a fine electron emission material layer coated with an electron emission material having a finer particle size than the particle size of the electron emission material forming the electron emission material layer to improve the surface roughness is formed on the surface of the electron emission material layer It features.

상기 전자방출물질층이 60 내지 75㎛ 두께로 형성되며, 상기 미세전자방출물질층은 1㎛ 내외의 입도의 미세한 전자방출물질로 1-6㎛ 두께로 형성되는 것이 바람직하며, 그 미세전자방출물질층은, 탄산염 또는 금속환원제 첨가 탄산염 등으로 될 수 있다.The electron-emitting material layer is formed to a thickness of 60 to 75㎛, the micro-electron emitting material layer is formed of a fine electron emitting material having a particle size of about 1㎛ around 1-6㎛ thickness, the fine electron emitting material The layer may be a carbonate or a metal reducing agent-added carbonate or the like.

또한, 본 발명에 따른 균일한 전자방출특성을 향상시킨 음극선관의 캐소드의 제조방법은, 기저금속 위에 전자방출물질층을 형성하여 전자를 방출시키기 위한 음극선관의 캐소드의 제조방법에 있어서, 상기 기저금속 위에 전자방출물질층을 스프레이에 의해 형성시키는 단계와, 전자방출물질층을 형성하는 전자방출물질의 입도보다 미세한 입도의 전자방출물질을 그 전자방출물질층위에 자유낙하시켜 미세전자방출물질층을 형성시키는 단계를 포함하여 구성되는 것을 특징으로 하며, 구체적으로는 스프레이 장치에 의해 수평으로 미세전자방출물질분말을 분출시켜 전자방출물질층상으로 자유 낙하시킴으로써 수행될 수 있다.In addition, the cathode manufacturing method of the cathode tube with improved electron emission characteristics according to the present invention, in the cathode manufacturing method of the cathode tube for emitting electrons by forming an electron emitting material layer on the base metal, the base Forming an electron-emitting material layer on the metal by spray, and freely dropping the electron-emitting material having a particle size smaller than that of the electron-emitting material forming the electron-emitting material layer on the electron-emitting material layer. It characterized in that it comprises a step of forming, specifically, it can be carried out by spraying the fine electron-emitting material powder horizontally by the spray device to free fall onto the electron-emitting material layer.

이하, 본 발명의 실시예들에 따른 환원제가 투입된 음극선관의 캐소드 구조와 그 제조방법을 도면과 함께 설명하면, 다음과 같다.Hereinafter, a cathode structure of a cathode ray tube in which a reducing agent is added according to embodiments of the present invention and a manufacturing method thereof will be described with reference to the accompanying drawings.

본 발명의 요지는 표면거칠기를 감소시키기 위해 종래의 전자방출물질층(21) 위에 미세전자방출물질층(24)을 형성하는 것이다.The gist of the present invention is to form the fine electron emission material layer 24 on the conventional electron emission material layer 21 to reduce the surface roughness.

즉, 기저금속(23) 위에 전자방출물질층(21)을 형성하여 전자를 방출시키기 위한 음극선관의 캐소드에 있어서, 표면거칠기를 향상시키기 위해 상기 전자방출물질층(21)을 형성하는 전자방출물질의 입도보다 미세한 입도의 전자방출물질에 의해 미세전자방출물질층(24)이 형성된다.That is, in the cathode of the cathode ray tube for emitting electrons by forming the electron emission material layer 21 on the base metal 23, the electron emission material forming the electron emission material layer 21 to improve the surface roughness The fine electron emission material layer 24 is formed of the electron emission material having a particle size smaller than that of.

본 발명의 일실시예에 따르면, 상기 전자방출물질층(21)이 60 내지 75㎛ 두께로 형성되며, 미세전자방출물질층(24)은 1㎛ 내외의 입도의 미세한 전자방출물질로 1-6㎛ 두께로 형성됨으로써 본 발명의 목적이 달성되었다. 이 경우, 상기 미세전자방출물질층(24)은, 탄산염 또는 금속환원제 첨가 탄산염 등으로 이루어진다.According to the exemplary embodiment of the present invention, the electron emission material layer 21 is formed to a thickness of 60 to 75 μm, and the fine electron emission material layer 24 is a fine electron emission material having a particle size of about 1 μm and about 1-6. The object of the present invention has been achieved by being formed to a thickness of μm. In this case, the fine electron emission material layer 24 is made of carbonate or a metal reducing agent added carbonate.

즉, 그 제조방법은, 종래와 같이 기저금속(23) 위에 스프레이 등에 의해 전자방출물질층(21)을 형성하고, 그 뒤, 전자방출물질층(21)을 형성하는 전자방출물질의 입도보다 미세한 입도의 전자방출물질을 그 전자방출물질층(21)위에 자유낙하시켜 미세전자방출물질층(24)을 형성시켰다.That is, the method for manufacturing the electron emitting material layer 21 is formed on the base metal 23 by spraying or the like, and then finer than the particle size of the electron emitting material forming the electron emitting material layer 21. An electron-emitting material having a particle size was freely dropped on the electron-emitting material layer 21 to form a fine electron-emitting material layer 24.

이때, 밀링시간을 증가시키는 등의 방법으로 기존보다 미세한 입도(1㎛ 이하)의 믹스쳐를 준비하였으며, 자유낙하의 밀도가 균일하게 전자방출물질층(21)상으로 자유 낙하되도록 스프레이 장치(30)에 의해 수평으로 미세전자방출물질분말의 믹스쳐를 일차적으로 분출시키고, 그 뒤, 전자방출물질층(21)상으로 자유 낙하되게 하였다.In this case, a mixture having a finer particle size (1 μm or less) was prepared by increasing the milling time, and the spray device 30 so that the density of free fall falls freely onto the electron-emitting material layer 21 uniformly. ), The mixture of the fine electron-emitting material powder was first ejected horizontally, and then freely dropped onto the electron-emitting material layer 21.

이와 같이 하여 형성된 음극선관의 캐소드는, 도 3에 도시된 바와 같이 전자방출물질층(21)의 거친 표면상에 미세 입자들이 삽입되는 형태로 코팅되어 표면 거칠기가 크게 감소하였고, 이에 따라, 전자방출층의 표면거칠기를 줄임으로써 전자방출 선속도의 차이를 줄일 수 있으며, 그포트 싸이즈를 줄여 포커싱 특성을 개선하였다.The cathode of the cathode ray tube thus formed is coated in a form in which fine particles are inserted on the rough surface of the electron-emitting material layer 21 as shown in FIG. 3, thereby greatly reducing the surface roughness. By reducing the surface roughness of the layer, the difference in electron emission linear velocity can be reduced, and the gport size is reduced to improve focusing characteristics.

또한, 이와 같이 전자방출층의 표면거칠기를 줄임으로써 모아레 발생을 억제하였으며, 기존 전자방출층의 코팅밀도의 변형을 주지 않고도 표면층만을 개선하여 상술한 특성개선이 가능하여 제조가 용이하게 되고, 기존의 공정장비인 스프레이머신 상에서 일체 작업을 변경함이 없이 사용할 수 있어 제조비용 또한, 저감된다.In addition, moiré generation was suppressed by reducing the surface roughness of the electron-emitting layer, and the above-described characteristics were improved by improving only the surface layer without modifying the coating density of the existing electron-emitting layer, thereby facilitating manufacture. It can be used without changing any work on the spray machine, which is a process equipment, and the manufacturing cost is also reduced.

이상에서 설명한 바와 같이 본 발명에 따른 균일한 전자방출특성을 향상시킨 음극선관의 캐소드와 그 제조방법의 구성과 작용에 의하면, 미세전자방출물질층(24)을 자유 낙하방식으로 형성시킴으로써 전자방출층의 표면거칠기를 줄임으로써 전자방출을 보다 균일하게 할 수 있고, 전자방출특성과 수명을 향상시킬 수 있으며, 포커싱 특성을 개선함과 동시에 모아레 발생을 억제할 수 있는 균일한 전자방출특성을 향상시킬 수 있는 등의 효과가 있다.As described above, according to the structure and function of the cathode of the cathode ray tube with improved electron emission characteristics and the manufacturing method thereof according to the present invention, the electron emission layer is formed by forming the fine electron emission material layer 24 in a free-falling manner. By reducing the surface roughness, the electron emission can be made more uniform, the electron emission characteristics and lifetime can be improved, the focusing characteristics can be improved, and the uniform electron emission characteristics that can suppress moiré generation can be improved. There is such an effect.

Claims (5)

기저금속(23) 위에 전자방출물질층(21)을 형성하여 전자를 방출시키기 위한 음극선관의 캐소드에 있어서,In the cathode of the cathode ray tube for emitting electrons by forming an electron-emitting material layer 21 on the base metal 23, 표면거칠기를 향상시키기 위해 상기 전자방출물질층(21)을 형성하는 전자방출물질의 입도보다 미세한 입도의 전자방출물질에 의해 코팅된 미세전자방출물질층(24)이 상기 전자방출물질층(21)의 표면에 형성된 것을 특징으로 하는 균일한 전자방출특성을 향상시킨 음극선관의 캐소드.In order to improve the surface roughness, the fine electron emission material layer 24 coated with the electron emission material having a finer particle size than the particle size of the electron emission material forming the electron emission material layer 21 is the electron emission material layer 21. The cathode of the cathode ray tube, which is formed on the surface of the improved electron emission characteristics. 제 1 항에 있어서, 상기 전자방출물질층(21)이 60 내지 75㎛ 두께로 형성되며, 상기 미세전자방출물질층(24)은 1㎛ 내외의 입도의 미세한 전자방출물질로 1-6㎛ 두께로 형성된 것을 특징으로 하는 균일한 전자방출특성을 향상시킨 음극선관의 캐소드.The method of claim 1, wherein the electron emitting material layer 21 is formed to a thickness of 60 to 75㎛, the fine electron emitting material layer 24 is a fine electron emitting material with a particle size of about 1㎛ 1-6㎛ thickness Cathode of cathode ray tube tube, characterized in that the improved electron emission characteristics improved. 제 1 항 또는 제 2 항에 있어서, 상기 미세전자방출물질층(24)은, 탄산염 또는 금속환원제 첨가 탄산염 등으로 된 것을 특징으로 하는 균일한 전자방출특성을 향상시킨 음극선관의 캐소드.3. The cathode of claim 1 or 2, wherein the microelectron emitting material layer (24) is made of a carbonate, a metal reducing agent-added carbonate, or the like. 기저금속(23) 위에 전자방출물질층(21)을 형성하여 전자를 방출시키기 위한 음극선관의 캐소드의 제조방법에 있어서,In the method for producing a cathode of a cathode ray tube for emitting electrons by forming an electron-emitting material layer 21 on the base metal 23, 상기 기저금속(23) 위에 전자방출물질층(21)을 스프레이에 의해 형성시키는 단계와, 전자방출물질층(21)을 형성하는 전자방출물질의 입도보다 미세한 입도의 전자방출물질을 그 전자방출물질층(21)위에 자유낙하시켜 미세전자방출물질층(24)을 형성시키는 단계를 포함하여 구성되는 것을 특징으로 하는 균일한 전자방출특성을 향상시킨 음극선관의 캐소드의 제조방법.Forming an electron-emitting material layer 21 on the base metal by spraying the electron-emitting material having a particle size finer than that of the electron-emitting material forming the electron-emitting material layer 21. A method of manufacturing a cathode of a cathode ray tube with improved electron emission characteristics, characterized in that it comprises a step of freely falling on the layer (21) to form a fine electron emission material layer (24). 제 4 항에 있어서, 상기 미세전자방출물질층(24)은, 스프레이 장치(30)에 의해 수평으로 미세전자방출물질분말을 분출시켜 전자방출물질층(21)상으로 자유 낙하시키는 것을 특징으로 하는 균일한 전자방출특성을 향상시킨 음극선관의 제조방법.The method of claim 4, wherein the micro-electron emitting material layer 24 is characterized in that the spraying device 30 to eject the fine electron-emitting material powder horizontally to freely fall onto the electron-emitting material layer (21). A method for producing a cathode ray tube with improved electron emission characteristics.
KR1019990030117A 1999-07-23 1999-07-23 Cathode for cathode ray tube to improve the characteristics of even electron-emission and its manufacturing method KR20010010957A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2826505A1 (en) * 2001-06-22 2002-12-27 Samsung Sdi Co Ltd Cathode for electron tube, comprises electron-emitting material layer coated on metal base, comprising needle-shaped conductive material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2826505A1 (en) * 2001-06-22 2002-12-27 Samsung Sdi Co Ltd Cathode for electron tube, comprises electron-emitting material layer coated on metal base, comprising needle-shaped conductive material

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