KR100258905B1 - Electron gun for color cathode ray tube - Google Patents

Electron gun for color cathode ray tube Download PDF

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Publication number
KR100258905B1
KR100258905B1 KR1019930003305A KR930003305A KR100258905B1 KR 100258905 B1 KR100258905 B1 KR 100258905B1 KR 1019930003305 A KR1019930003305 A KR 1019930003305A KR 930003305 A KR930003305 A KR 930003305A KR 100258905 B1 KR100258905 B1 KR 100258905B1
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South Korea
Prior art keywords
electrode
voltage
focus
cathode ray
ray tube
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KR1019930003305A
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Korean (ko)
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KR940022656A (en
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주형일
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손욱
삼성에스디아이주식회사
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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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/54—Arrangements for centring ray or beam
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/485—Construction of the gun or of parts thereof
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/50—Plurality of guns or beams
    • H01J2229/502—Three beam guns, e.g. for colour CRTs

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  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

PURPOSE: An electron gun for color cathode ray tube is provided to reduce greatly spherical aberration and astigmatism received from main lens by making an incidence into main lens after making a previous focus electron beam. CONSTITUTION: A fronting triode part is composed of cathode(21), control electrode(22), screen electrode(23), a subsidiary lens and main lens are composed of the first(24), second(25) focus electrode, and final acceleration electrode(26) is installed. The first static voltage(VS1) is licensed at above control electrode(22) and the first focus electrode(15), the second static voltage(VS2) is licensed at above screen electrode(23) and the focus voltage(VF) and anode voltage(VE) is licensed at above the second focus electrode(25) and final acceleration electrode(26) separately. The first static voltage(VS1) is ground voltage, the second static voltage(VS2) is 200 to 400 volts, and the focus voltage(VF) is 28% of 25 to 35KV of anode voltage(VE).

Description

칼라 음극선관용 전자총Electron gun for colored cathode ray tube

제1도는 종래 칼라 음극선관용 전자총의 입단면도.1 is a cross-sectional view of an electron gun for a conventional color cathode ray tube.

제2도는 본 발명에 따른 칼라 음극선관용 전자총을 도시한 것으로, 전압인가 방법을 나타내 보인 것이다.2 shows an electron gun for a color cathode ray tube according to the present invention, showing a voltage application method.

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

21 : 캐소오드 22 : 제어전극21: cathode 22: control electrode

23 : 스크린 전극 24 : 제1포커스 전극23: screen electrode 24: first focus electrode

25 : 제2포커스 전극 VF : 포커스 전압25: second focus electrode VF: focus voltage

VS2 : 제2정전압VS2: Second Constant Voltage

본 발명은 칼라 음극선관용 전자총에 관한 것으로, 더 상세하게는 캐소오드로부터 방출된 전자빔을 다단집속하여 포커스 특성을 향상시킨 칼라 음극선관용 전자총에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun for color cathode ray tubes, and more particularly, to an electron gun for color cathode ray tubes in which focusing is enhanced by multi-stage focusing of an electron beam emitted from a cathode.

통상적으로 칼라 음극선관용 전자총은 음극선관의 네크부에 설치되어 전자빔을 형광막에 주사 함으로써 형광막을 여기시키는 것으로 그 일 실시예를 도 1에 나타내 보였다.Typically, an electron gun for a color cathode ray tube is installed at the neck portion of a cathode ray tube to excite a fluorescent film by scanning an electron beam to the fluorescent film.

이것은 전치 삼극부를 이루는 캐소오드(11), 제어전극(12) 및 스크린 전극(13)과 주렌즈를 이루는 포커스 전극(14)과 최종가속전극(15)를 구비하여 구성되고 이들 각 전극에는 소정의 전압이 인가되는데, 이를 설명하면 다음과 같다. 즉, 상기 스크린 전극(13)에는 소정의 정전압(VS)이 인가되고 상기 포커스 전극(14)에는 상기 정전압(VS)보다 높은 포커스전압(VF)이 인가되며 상기 최종가속전극(15)에는 고압의 에노우드 전압(VE)이 인가된다. (VS〈VF〈VE)It is composed of a cathode 11, a control electrode 12, and a screen electrode 13 and a focus electrode 14 constituting a main lens and a final acceleration electrode 15, which form an anterior triode, and each electrode has a predetermined value. Voltage is applied, which is explained as follows. That is, a predetermined constant voltage VS is applied to the screen electrode 13, a focus voltage VF higher than the constant voltage VS is applied to the focus electrode 14, and a high voltage is applied to the final acceleration electrode 15. Enode voltage VE is applied. (VS <VF <VE)

이와 같이 구성된 종래 칼라 음극선관용 전자총(10)은 각 전극에 소정의 전위가 인가 됨에 따라 상기 스크린 전극(13)과, 포커스 전극(14)사이에 프리 포커스렌즈가 형성되고 상기 포크스전극(14)와 최종가속 전극(15)사이에 주 렌즈가 형성되게 된다.In the conventional color cathode ray tube electron gun 10 configured as described above, as a predetermined potential is applied to each electrode, a prefocus lens is formed between the screen electrode 13 and the focus electrode 14, and the forks electrode 14 and The main lens is formed between the final acceleration electrodes 15.

따라서 상기 캐소오드(11)로 부터 방출된 전자빔은 상기 프리 포커스 렌즈에서 예비 집속 및 가속되고 주렌즈에 의해 최종 집속 및 가속된후 형광막의 주사 위치에 따라 편향요오크에 의해 편향되어 형광막에 랜딩됨으로써 하나의 화소를 이루게 되고 이들 화소가 모여 화상을 이루게 된다. 그런데, 이와같은 종래의 전자빔은 전자총(10)으로 부터 방출된 전자빔이 중앙과 주변부에서 정확하게 형광점에 주사되지 않은 문제점이 있었다. 즉, 상기 음극선관의 스크린 면은 기하학적 곡률을 가지고 있으므로 전자총으로부터 방출된 전자빔이 형광막의 주변부에 주사될시 언더 포커싱되어 전자빔 스포트가 상대적으로 커지게 되므로써 인접하는 형광체층을 발광시키게되고 나아가서는 색번짐 현상이 발생되는 문제점이 내재되어 있었다.Therefore, the electron beam emitted from the cathode 11 is preliminarily focused and accelerated in the prefocus lens and finally focused and accelerated by the main lens, and then deflected by deflection yoke according to the scanning position of the fluorescent film and landing on the fluorescent film. As a result, one pixel is formed and these pixels are gathered to form an image. However, this conventional electron beam has a problem that the electron beam emitted from the electron gun 10 is not accurately scanned at the fluorescent point at the center and the periphery. That is, since the screen surface of the cathode ray tube has a geometric curvature, when the electron beam emitted from the electron gun is scanned at the periphery of the fluorescent film, it is underfocused so that the electron beam spot becomes relatively large, thereby causing the adjacent phosphor layers to emit light, and thus color bleeding phenomenon. This problem was inherent.

따라서 본 발명은 상기 문제점을 해결하기 위하여 안출된 것으로, 전자빔의 포커스 특성을 대폭 향상시킬 수 있으며, 나아가서는 이를 채용한 음극선관의 해상도를 향상시킬 수 있는 칼라 음극선관용 전자총을 제공함에 그 목적이 있다.Accordingly, an object of the present invention is to provide an electron gun for a color cathode ray tube, which can greatly improve the focus characteristic of an electron beam, and further improve the resolution of a cathode ray tube employing the same. .

상기 목적을 달성하기 위하여 본 발명은 전치 삼극관부를 이루는 캐소오드, 제어전극 및 스크린 전극과 보조렌즈 및 주렌즈를 이루는 제1,2 포커스 전극과 최종가속 전극을 구비하고, 상기 제어전극과 제1포커스 전극에 제1정전압이 인가되고 상기 스크린 전극에 제2정전압이 인가되며, 상기 제2포커스 전극과 최종가속전극에는 각각 포커스 전극과 에노우드 전압이 인가되어 된 것을 그 특징으로 한다.In order to achieve the above object, the present invention includes a cathode, a control electrode, a screen electrode, and a first and a second focus electrode and a final acceleration electrode constituting an auxiliary lens and a main lens, and the control electrode and the first focus. A first constant voltage is applied to the electrode, a second constant voltage is applied to the screen electrode, and a focus electrode and an anode voltage are applied to the second focus electrode and the final acceleration electrode, respectively.

이하 첨부된 도면을 참조하여 본 발명에 따른 한 바람직한 실시예를 상세하게 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2에는 본 발명에 따른 칼라 음극선관용 전자총이 도시되어 있는바, 이는 전치 삼극부를 이루는 캐소오드(21), 제어전극(22) 및 스크린 전극(23)과, 보조렌즈 및 주렌즈를 이루는 것으로, 상기 스크린 전극(23)으로 부터 순차적으로 배열되는 제1,2포커스 전극(24)(25)과 최종가속전극(26)를 구비하여 구성된다. 여기에서 상기 전자총(20)를 이루는 각 전극에는 전자빔통과공이 형성되는데, 제2포커스 전극(24)에 형성된 전자빔통과공(24H)은 인접하는 전자빔 통과공(23H)보다 크게 형성된다. 그리고 상기 각 전극에는 소정의 전위가 인가되는데, 이를 설명하면 다음과 같다. 상기 제어전극(22)과 제1포커스 전극(24)에는 그라운드 전압인 제1정전압(VS1)이 인가되고 상기 스크린 전극(23)에는 제2정전압(VS2)이 인가되며 상기 스크린 전극(25)에는 상기 제2정전압(VS2)보다 높은 포커스전압(VF)이 인가되고 상기 최종가속전극(26)에는 고압의 에노우드 전압(VE)이 인가된다. (VS1〈VS2〈VF〈VE)2 shows an electron gun for a color cathode ray tube according to the present invention, which forms a cathode 21, a control electrode 22 and a screen electrode 23, and an auxiliary lens and a main lens, which form an anterior triode. The first and second focus electrodes 24 and 25 and the final acceleration electrode 26 are sequentially arranged from the screen electrode 23. Herein, an electron beam through hole is formed in each electrode constituting the electron gun 20, and the electron beam through hole 24H formed in the second focus electrode 24 is formed larger than the adjacent electron beam through hole 23H. A predetermined potential is applied to each of the electrodes, which will be described below. The first constant voltage VS1, which is a ground voltage, is applied to the control electrode 22 and the first focus electrode 24, and the second constant voltage VS2 is applied to the screen electrode 23, and to the screen electrode 25. A focus voltage VF higher than the second constant voltage VS2 is applied, and a high voltage enowood voltage VE is applied to the final acceleration electrode 26. (VS1 <VS2 <VF <VE)

이와같이 구성된 본 발명에 따른 칼라 음극선관용 전자총의 작용을 설명하면 다음과 같다.Referring to the operation of the electron gun for the color cathode ray tube according to the present invention configured as described above are as follows.

먼저 상기 전자총(20)은 이를 이루는 각 전극에 소정의 전압이 인가됨에 따라 상기 스크린 전극(23)과 제1포커스전극(24) 사이에 프리 포커스 전자 렌즈가 형성되고 상기 제1,2포커스전극(24)(25)사이에는 보조 전자렌즈가 형성되며 상기 제2포커스전극(25)과 최종가속 전극(26)사이에는 주렌즈가 형성된다.First, as a predetermined voltage is applied to each electrode forming the electron gun 20, a prefocus electron lens is formed between the screen electrode 23 and the first focus electrode 24, and the first and second focus electrodes ( An auxiliary electron lens is formed between 24 and 25, and a main lens is formed between the second focus electrode 25 and the final acceleration electrode 26.

따라서 상기 캐소오드(21)로 부터 방출된 전자빔은 상기 프리포커스 렌즈에서 예비 집속 및 가속되고 상기 보조렌즈에 의해 재집속 및 가속된 후 주렌즈에 입사되게 되므로 주렌즈에 입사되는 전자빔의 입사각도를 줄일 수 있다. 따라서 주렌즈를 통과하는 전자빔의 구면수차가 상대적으로 줄어들게 되어 전자총으로 부터 방출된 전자빔이 형광막에 최상의 상태로 랭딩되게 된다. 따라서 종래와 같이 화면의 주변부에서 포커스 특성이 저하되는 것을 방지할 수 있는 것이다.Therefore, since the electron beam emitted from the cathode 21 is pre-focused and accelerated in the prefocus lens and then re-focused and accelerated by the auxiliary lens, the electron beam is incident on the main lens. Therefore, the incident angle of the electron beam incident on the main lens is changed. Can be reduced. Therefore, the spherical aberration of the electron beam passing through the main lens is relatively reduced, so that the electron beam emitted from the electron gun is best optimized to the fluorescent film. Therefore, the focus characteristic can be prevented from being degraded at the periphery of the screen as in the related art.

이상에서와 같이 본 발명 칼라 음극선관용 전자총은 전자빔을 예비 집속한 후 주렌즈에 입사시키게 되므로 주렌즈에서 받는 구면수차와 비점수차를 대폭 줄일 수 있는 이점을 가진다.As described above, the electron gun for the color cathode ray tube of the present invention has the advantage of greatly reducing spherical and astigmatism received by the main lens since the electron beam is preliminarily focused on the electron beam.

Claims (3)

전치 삼극관부를 이루는 캐소오드(21), 제어전극(22) 및 스크린 전극(23)과 보조렌즈 및 주렌즈를 이루는 제1,2 포커스전극(24)(25)과 최종가속 전극(26)을 구비하고, 상기 제어전극(22)과 제1포커스 전극(24)에 제1정전압(VS1)이 인가되고 상기 스크린 전극(23)에 제2정전압(VS2)이 인가되며, 상기 제2포커스 전극(25)과 최종가속전극(26)에는 각각 포커스 전압(VF)과 에노우드 전압(VE)이 인가되어 된 것을 특징으로 하는 칼라 음극선관용 전자총.A cathode 21, a control electrode 22, and a screen electrode 23, which form the front triode, and the first and second focus electrodes 24, 25, and the final acceleration electrode 26, which form an auxiliary lens and a main lens, are provided. The first constant voltage VS1 is applied to the control electrode 22 and the first focus electrode 24, the second constant voltage VS2 is applied to the screen electrode 23, and the second focus electrode 25 is applied. And a focus voltage (VF) and an enowood voltage (VE) are applied to the final acceleration electrode (26) and the final acceleration electrode (26), respectively. 제1항에 있어서, 상기 제1정전압(VS1)이 그라운드 전압이며 상기 제2정전압(VS2)가 200 내지 400 볼트이며 상기 포커스 전압(VF)이 에노우드 전압(VE)인 35 내지 25KV의 28% 인것을 특징으로 하는 칼라 음극선관용 전자총.The method of claim 1, wherein the first constant voltage VS1 is a ground voltage, the second constant voltage VS2 is 200 to 400 volts, and the focus voltage VF is 28% of 35 to 25 KV, which is an enwood voltage VE. Electron gun for color cathode ray tube, characterized in that. 제1항에 있어서, 제1포커스 전극에 형성된 전자빔 통과공(24H)이 스크린 전극에 형성된 전자빔 통과공(23H)보다 크게 형성된 것을 특징으로 하는 칼라 음극선관용 전자총.The electron gun for a color cathode ray tube according to claim 1, wherein an electron beam through hole (24H) formed in the first focus electrode is formed larger than an electron beam through hole (23H) formed in the screen electrode.
KR1019930003305A 1993-03-05 1993-03-05 Electron gun for color cathode ray tube KR100258905B1 (en)

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