KR100492956B1 - Conductive film formation of color cathode ray tube - Google Patents

Conductive film formation of color cathode ray tube Download PDF

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KR100492956B1
KR100492956B1 KR1019970050887A KR19970050887A KR100492956B1 KR 100492956 B1 KR100492956 B1 KR 100492956B1 KR 1019970050887 A KR1019970050887 A KR 1019970050887A KR 19970050887 A KR19970050887 A KR 19970050887A KR 100492956 B1 KR100492956 B1 KR 100492956B1
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conductive film
cathode ray
ray tube
funnel
graphite
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KR1019970050887A
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Korean (ko)
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KR19990030606A (en
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오승희
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엘지전자 주식회사
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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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/88—Coatings
    • H01J2229/882—Coatings having particular electrical resistive or conductive properties
    • 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

Abstract

본 발명은 칼라음극선관의 도전막조성에 관한 것으로, 특히 펀넬의 내면에 형성되는 내부도전막 조성물의 비중 차이를 줄여서 침전물 생성을 방지하고 균일한 도전막을 형성시키며 음극선관 내부에서의 잔류가스 흡착을 증대시켜 더욱 품질이 향상된 음극선관을 제공하는데 목적이 있다.The present invention relates to a conductive film composition of a color cathode ray tube, and in particular, to reduce the difference in specific gravity of the inner conductive layer composition formed on the inner surface of the funnel to prevent the formation of precipitates, to form a uniform conductive layer, and to adsorb residual gas inside the cathode ray tube. The purpose is to provide a cathode ray tube which is further improved in quality.

이를 실현하기 위하여 본 발명은 도전막 조성물중의 흑연과 비중이 비슷한 제올라이트를 금속산화물 대신 첨가하여 도전막을 조성하였다.In order to realize this, the present invention added a zeolite having a specific gravity similar to that of graphite in the conductive film composition, instead of the metal oxide, thereby forming a conductive film.

Description

칼라음극선관의 도전막 조성Conductive film composition of color cathode ray tube

본 발명은 칼라음극선관에 관한 것으로서, 특히 펀넬 내부면에 형성되는 내부도전막 조성물간의 비중 차이를 줄여서 균일한 도전막이 형성될 수 있도록 하기위한 도전막 조성에 관한 것이다.The present invention relates to a color cathode ray tube, and more particularly, to a conductive film composition for reducing a difference in specific gravity between internal conductive film compositions formed on an inner surface of a funnel so that a uniform conductive film can be formed.

종래의 칼라브라운관은 도 1 에 도시한 바와 같이 내측면에 형광막(4)이 형성된 패널(1)과 내측면과 외측면에 전도성을 갖는 도전막(6,7)이 도포된 펀넬(2)이 약 450℃의 로에서 융착 글라스로 서로 봉합되어지며, 상기 펀넬(2)의 네크부(8)에는 전자빔을 발생시키는 전자총(9)이 장착되어 있고, 상기 패널(1)의 내측에는 색선별 전극인 새도우 마스크(5)가 프레임(3)에 의하여 지지되어 있으며, 상기 펀넬(2)의 중앙부에는 음극선관 동작시 전원이 인가되는 캐비티(10)가 구성된다.In the conventional color-brown tube, as shown in FIG. 1, the panel 1 having the fluorescent film 4 formed on the inner side thereof and the funnel 2 coated with the conductive films 6 and 7 having conductivity on the inner side and the outer side surface are illustrated. In the furnace at about 450 ° C., each of the funnels 2 is sealed with each other by fusion glass, and the neck portion 8 of the funnel 2 is equipped with an electron gun 9 for generating an electron beam. The shadow mask 5, which is an electrode, is supported by the frame 3, and a cavity 10 to which power is applied during cathode ray tube operation is formed at the center of the funnel 2.

도면중 미설명 부호 11은 접촉스프링을 나타낸다.In the figure, reference numeral 11 denotes a contact spring.

이와같이 구성되는 칼라브라운관은 전자총에 영상신호를 입력하면 전자총의 캐소드로부터 열전자가 방출되며, 방출된 전자는 전자총의 각 전극에서 인가된 전압에 의하여 패널(1)쪽으로 가속 및 집속과정을 거치면서 진행하게 된다.The color CRT configured as described above receives thermal signals from the cathode of the electron gun when the image signal is input to the electron gun, and the emitted electrons are accelerated and focused toward the panel 1 by the voltage applied from each electrode of the electron gun. do.

이때 전자빔 프레임(3)에 결합된 새도우 마스크(5)의 슬롯을 통과하면서 색선별이 이루어지고 선별된 전자빔은 패널(1)내면에 형성된 각각의 R,G,B 형광막(4)에 충돌하여 발광시킴으로써 영상신호를 재현한다.In this case, color selection is performed while passing through slots of the shadow mask 5 coupled to the electron beam frame 3, and the selected electron beam collides with each of the R, G, and B fluorescent films 4 formed on the inner surface of the panel 1. By emitting light, a video signal is reproduced.

이와같이 구동되는 칼라 음극선관은 동작시 케비티(10)를 통해서 전기가 인가되면 내부도전막(6)에 접촉된 접촉스프링(11)에 의해 새도우마스크(5)와 형광막(4)에 전기가 공급되어 전자들의 흐름이 원활하게 된다.In the color cathode ray tube driven as described above, when electricity is applied through the cavity 10 during operation, electricity is supplied to the shadow mask 5 and the fluorescent film 4 by the contact spring 11 contacting the inner conductive film 6. Supplied to facilitate the flow of electrons.

펀넬(2)의 내부에 형성되는 내부도전막(6)은 주로 흑연, 물유리, 분산제 혹은 흑연, 금속 산화물, 물유리, 분산제 등으로 조성되게 되며, 칼라 음극선관의 내부에서 전기적 도통 경로 역할, 출력 전압의 진동을 줄여주는 평활 콘덴서 역할, 전기적 차폐 기능등을 수행한다.The internal conductive film 6 formed inside the funnel 2 is mainly composed of graphite, water glass, dispersant or graphite, metal oxide, water glass, dispersant, etc., and serves as an electrical conduction path within the color cathode ray tube, and an output voltage. It acts as a smoothing condenser to reduce vibration and performs electrical shielding.

이중 흑연은 전기 도전 재료로 사용되며, 분산제는 흑연입자들을 용액중에 골고루 분산시켜 주며, 물유리는 흑연 입자들을 펀넬유리에 접착시켜주는 기능을 한다.Double graphite is used as an electrically conductive material, the dispersing agent evenly disperses the graphite particles in the solution, water glass serves to bond the graphite particles to the funnel glass.

상기와같은 역할을 하는 흑연, 물유리, 분산제, 순수로 이루어진 내부 도전막(6) 조성물은 전기 도전성이 너무 좋아서 음극선관 내부에서 발생하는 높은 스파크 전류에 의해 음극선관 외부에 포함되는 전기회로 기판의 부품이 파괴되는 문제가 있었다.The composition of the internal conductive film 6 composed of graphite, water glass, a dispersant, and pure water having such a role is so excellent in electrical conductivity that components of an electric circuit board are included outside the cathode ray tube by a high spark current generated inside the cathode ray tube. There was a problem of being destroyed.

이러한 문제를 해결하기 위해 도전막에 금속 산화물을 첨가하게 되는데, 여기에 첨가되는 금속 산화물은 부도체로서 주로 산화티탄 분말이나, 산화철 분말을 소량 첨가하여, 내부 도전막의 저항을 높여주고 스파크 전류에 의한 회로 손상을 방지하는 역할을 수행한다. 이렇게 조합한 내부 도전막 조성물을 도 2 와 같이 분사법(가) 스폰지도포법(나) 플로도포법(다) 등을 이용하여 펀넬 내부에 형성하게 된다.In order to solve this problem, a metal oxide is added to the conductive film. The metal oxide is added as a non-conductor, mainly by adding a small amount of titanium oxide powder or iron oxide powder, thereby increasing the resistance of the internal conductive film and causing a circuit by a spark current. It serves to prevent damage. The internal conductive film composition thus combined is formed inside the funnel using the spray method (a) sponge coating method (b) flow coating method (c) or the like as shown in FIG.

종래 금속산화물과 흑연의 비중을 살펴보면 산화티탄은 약 4.17이며, 산화철은 약 5.2, 흑연은 1.9∼2.2정도이므로 금속 산화물은 흑연과의 비중 차이가 커서 도전막 조성물을 펀넬의 내부에 형성하기 전에 용액 상태로 가만히 방치를 시키면, 침전물이 급격히 형성되어 도전막 조성물 보관용기의 바닥에 가라앉게 되는 문제가 있었으며, 이를 다시 교반을 하더라고 미세한 덩어리가 남아있어서 펀넬에 형성된 도전막의 접착력을 저하시켜 쉽게 탈락이 되는 문제가 있었으며, 도전막 조성물의 보관 기간도 짧아 운송 및 사용에 문제가 있었다.When looking at the specific gravity of the conventional metal oxide and graphite, titanium oxide is about 4.17, iron oxide is about 5.2, graphite is about 1.9 to 2.2, so the metal oxide has a large specific gravity difference from graphite, so that before the conductive film composition is formed inside the funnel, If left still in the state, there was a problem that the precipitate is formed rapidly and sinks to the bottom of the conductive film composition storage container, and even if it is stirred again, fine lumps remain, which reduces the adhesion of the conductive film formed on the funnel and is easily eliminated. There was a problem, and the storage period of the conductive film composition was also short, and there was a problem in transportation and use.

또한, 도전막 조성물을 펀넬의 내부에 형성시켰을때에도 비중이 큰 금속 산화물이 먼저 펀넬 유리 접촉면에 가라앉게 되고, 비중이 작은 흑연은 도전막 위에 뜨게 되어 전기저항이 낮은 도전막 형성으로 인해 스파크 전류가 높아지는 문제가 있으며, 이러한 불균일한 도전막 형성으로 인해 도전막 접착력이 약해져서 외부 충격에 의해 도전막이 쉽게 떨어지게 되는데, 이는 새도우마스크의 구멍을 막아 전자빔이 투과하지 못하게 되고 결국 형광체가 부분적으로 발광하지 못하거나 전자총의 전극 사이에서 스파크가 발생하는 문제점이 있었다.In addition, even when the conductive film composition is formed inside the funnel, a metal oxide having a large specific gravity first sinks into the contact surface of the funnel glass, and graphite having a small specific gravity floats on the conductive film, resulting in a spark current due to the formation of a conductive film having low electrical resistance. There is a problem of increasing, the formation of this non-uniform conductive film weakens the adhesion of the conductive film, the conductive film is easily dropped by the external impact, which prevents the electron beam from penetrating through the hole of the shadow mask and the phosphor does not partially emit light There was a problem that sparks occurred between the electrodes of the electron gun.

본 발명은 상기한 바와같은 종래 기술의 문제점을 해결하기 위하여 발명된 것으로 펀넬에 도포되는 도전막 조성물중 흑연과 비중이 비슷한 제올라이트를 금속산화물 대신 첨가시킴으로서, 펀넬 내부에 균일한 도전막을 형성시켜 도전성이 좋으면서 스파크 전류를 낮추고 음극선관 내부에서의 잔류가스 흡착을 증대시킬 수 있는 도전막을 제공하는데 목적이 있다.The present invention is invented to solve the problems of the prior art as described above by adding a zeolite similar in specific gravity to graphite in the conductive film composition applied to the funnel instead of the metal oxide, thereby forming a uniform conductive film inside the funnel to improve the conductivity. It is an object of the present invention to provide a conductive film capable of reducing the spark current and increasing the adsorption of residual gas inside the cathode ray tube.

본 발명을 이하에서 상세히 설명한다.The present invention is described in detail below.

본 발명에서는 흑연, 금속산화물, 물유리, 분산제, 순수로 이루어진 도전막 조성물에서 금속산화물은 흑연과 비중차이가 큰 산화티탄이나 산화철 대신 흑연과 비중차이가 거의 없는 새로운 종류의 금속산화물인 제올라이트[알카리 및 알카리 토 금속의 규산알루미늄 수화물(WmSi:AlnO2n·SH2O,W=Na,Ca,K)]를 첨가한 도전막 조성물을 분사도포법, 브러쉬도포법, 플로 도포법 등을 이용하여 음극선관의 펀넬 전면에 형성되도록 하였다.In the present invention, the metal oxide in the conductive film composition composed of graphite, metal oxide, water glass, dispersant, and pure water is zeolite [alkali and a new kind of metal oxide having little specific gravity difference with graphite instead of titanium oxide or iron oxide having a large specific gravity difference with graphite. The conductive film composition to which the alkali silicate aluminum silicate hydrate (WmSi: AlnO 2 n · SH 2 O, W = Na, Ca, K)] was added was sprayed, brushed, flow applied, etc. It was formed on the front of the funnel of the tube.

이를 통해 도전막 조성물의 침전에 의한 층분리 현상을 해결하여 도전막 조성물의 보관기간을 증가시키고, 균일한 도전막을 형성하여 접착력이 향상되도록 하였으며, 균일한 전기저항치를 갖게하여 스파크 전류가 높아지는 문제가 개선되도록 하였다.Through this, the layer separation phenomenon due to the precipitation of the conductive film composition was solved, thereby increasing the storage period of the conductive film composition, forming a uniform conductive film to improve the adhesive force, and having a uniform electric resistance value, thereby increasing the spark current. To improve.

종래 금속산화물의 비중은 산화철이 약 5.2 정도이며 산화티탄이 약 4.17로서 흑연의 1.9∼2.2 보다 휠씬 높아 비중 차이에 의한 침전물 형성이 많았는데, 이를 해결하기 위해 규산 칼륨계의 분산제를 사용하였으나 이 역시 크게 개선되지는 않았다.Conventionally, the specific gravity of the metal oxide is about 5.2 of iron oxide and about 4.17 of titanium oxide, which is much higher than 1.9 to 2.2 of graphite. Therefore, many precipitates were formed due to the difference in specific gravity. To solve this problem, a potassium silicate-based dispersant was used. Not a big improvement.

본 발명에서는 비중이 약 2.2 정도인 제올라이트를 종래의 금속산화물 대신 첨가하여 침전문제를 해결하였다. 제올라이트는 흑연과 동일한 비중을 지니고 있기 때문에 흑연과 금속산화물을 쉽게 분산 시킬 수 있으며, 분산된 침전물의 침전은 상대적으로 적게 되도록 하였다. 이 조성물로 도전막을 형성시켰을 때, 흑연과 제올라이트와의 비중 차이가 없기 때문에 도전막 전체에 균일한 조성으로 흑연과 제올라이트가 분포하게 되어 종래의 조성물에 비해 저항값이 높아지게 되어 스파크 전류를 충분히 낮출수가 있게 되는 것이다.In the present invention, the problem of precipitation was solved by adding zeolite having a specific gravity of about 2.2 in place of the conventional metal oxide. Since zeolite has the same specific gravity as graphite, it is easy to disperse graphite and metal oxides, and the precipitation of dispersed precipitates is relatively small. When the conductive film is formed from this composition, there is no difference in specific gravity between the graphite and the zeolite, so that the graphite and the zeolite are distributed in a uniform composition throughout the conductive film, resulting in a higher resistance value than the conventional composition, thereby sufficiently reducing the spark current. Will be.

또한, 제올라이트는 수화물을 가지고 있으나 가열에 의해 수분이 제거되고 대신 다른 가스를 흡착하는 흡착성이 뛰어나서, 음극선관 내부에 잔류하는 가스 성분 흡착을 종래의 금속 산화물보다 많이 하면서도 방출은 적게하기 때문에 음극선관의 진공 품질을 높여서 음극선관의 수명을 향상시킬 수 있게된다.In addition, the zeolite has a hydrate, but the moisture is removed by heating and the adsorption of other gases instead of adsorption, the adsorption of gas components remaining inside the cathode ray tube more than conventional metal oxides, but emits less, so By increasing the vacuum quality, the life of cathode ray tube can be improved.

도전막 조성물은 흑연, 물유리, 제올라이트, 분산제, 순수로 구성되어 있으며 흑연:물유리의 조성비를 1:1∼1:3 이 되도록 물유리를 첨가했다. 물유리의 양이 1:3을 초과하게 되면 물유리가 수분을 많이 흡착하여 음극선관의 진공도를 나쁘게 하는 문제가 있으며, 조성비가 1:1 미만이 되면 조성물의 접착력이 약하게 되어 도전막이 쉽게 떨어져서 새도우마스크 막힘 및 전자총 불량을 일으킨다.The conductive film composition was composed of graphite, water glass, zeolite, dispersant, and pure water, and water glass was added so that the composition ratio of graphite: water glass was 1: 1 to 1: 3. If the amount of water glass exceeds 1: 3, the water glass adsorbs a lot of water and thus deteriorates the vacuum degree of the cathode ray tube. If the composition ratio is less than 1: 1, the adhesive strength of the composition is weakened, so that the conductive film easily falls off and the shadow mask is clogged. And electron gun failure.

또한 흑연:제올라이트의 조성비는 1:1∼1:5가 되게 하였으며, 이때의 전기 저항값은 1∼20kΩ/3cm가 된다. 제올라이트가 1:5를 초과하면 접착력이 저하되어 흑연 및 제올라이트가 쉽게 떨어져 방전 불량이 일어나며, 전기 흐름이 나빠져 스크린의 동작이 불량하게 되며, 조성비가 1:1 미만이 되면 도전성이 너무 좋아지게 되어 스파크전류를 충분히 낮추어 주지 못하게 되어 제올라이트를 첨가한 효과가 없어지게 된다.In addition, the composition ratio of graphite: zeolite is 1: 1 to 1: 5, and the electrical resistance at this time is 1 to 20 k? / 3 cm. If the zeolite exceeds 1: 5, the adhesion decreases and graphite and zeolite easily fall, resulting in poor discharge, poor electrical flow, and poor operation of the screen.When the composition ratio is less than 1: 1, the conductivity becomes too good and sparks The current cannot be lowered sufficiently, and the effect of adding zeolite is lost.

이상 설명한 바와같이 본 발명의 도전막 조성은 조성물중의 흑연 및 금속 산화물과의 비중차이를 줄여서 침전물 생성을 방지하고 균일한 도전막을 형성시켜 도전성이 향상되면서도 스파크 전류를 낮추고, 음극선관 내부에서의 잔류가스 흡착을 증대시켜 음극선관의 품질을 향상시키는 효과가 있다.As described above, the conductive film composition of the present invention reduces the specific gravity difference between the graphite and the metal oxide in the composition to prevent the formation of precipitates and to form a uniform conductive film, thereby lowering the spark current while improving conductivity, and remaining in the cathode ray tube. There is an effect of increasing the gas adsorption to improve the quality of the cathode ray tube.

도 1 은 일반적인 칼라음극선관의 단면도.1 is a cross-sectional view of a general color cathode ray tube.

도 2 는 펀넬 내부의 도전막 형성방법을 나타낸 것으로서,2 illustrates a method of forming a conductive film inside a funnel,

(가)는 분사법.(A) Injection method.

(나)는 브러쉬 도포법.(B) Brush coating method.

(다)는 플로 도포법.(C) is flow application method.

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

1 : 패널 2 : 펀넬1 panel 2 funnel

3 : 프레임 4 : 형광막3: frame 4: fluorescent film

5 : 새도우마스크 6 : 내부도전막5: shadow mask 6: inner conductive film

7 : 외부도전막 8 : 네크부7: outer conductive film 8: neck portion

9 : 전자총 10: 케비티9: electron gun 10: cavity

11: 접촉스프링11: contact spring

Claims (2)

형광막이 내측면에 도포된 패널과 도전막이 도포된 펀넬이 패널에 봉합되어지고, 펀넬의 후미에는 네크부가 있으며, 상기 네크부에는 전자총이 장착되어 있고, 패널 내측에는 색선별 전극인 새도우 마스크가 프레임에 지지되어 있으며, 펀넬의 외주면에는 전자빔을 편향시켜주는 편향요크가 장착되어 있는 칼라브라운관에 있어서,A panel coated with a fluorescent film on the inner surface and a funnel coated with a conductive film are sealed to the panel, a neck portion is formed at the rear of the funnel, an electron gun is mounted on the neck portion, and a shadow mask, which is a color-selective electrode, is framed inside the panel. In the color-brown tube, which is supported on the outer peripheral surface of the funnel, is equipped with a deflection yoke for deflecting the electron beam. 상기 펀넬 내면에 도포되는 상기 도전막은,The conductive film applied to the inner surface of the funnel, 그 전기 저항값이 1∼20kΩ/3cm 로 상기 펀넬 전체에 형성되고,The electrical resistance value is formed in the whole funnel at 1-20 kΩ / 3 cm, 흑연과 물유리 그리고 제올라이트의 조성비가 각각 1:1∼3:1∼5의 비율로 이루어짐을 특징으로 하는 칼라음극선관의 도전막 조성물.A conductive film composition of a color cathode ray tube, characterized in that the composition ratio of graphite, water glass and zeolite is in a ratio of 1: 1 to 3: 1 to 5, respectively. 제 1항에 있어서,The method of claim 1, 상기 도전막은 흑연;제올라이트의 조성비가 1:1~5로 이루어짐을 특징으로 하는 칼라음극선관의 도전막 조성.The conductive film is graphite; the conductive film composition of the color cathode ray tube, characterized in that the composition ratio of the zeolite is 1: 1 to 5.
KR1019970050887A 1997-10-02 1997-10-02 Conductive film formation of color cathode ray tube KR100492956B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4272701A (en) * 1979-08-27 1981-06-09 Gte Products Corporation Cathode ray tube arc limiting coating
US4425377A (en) * 1981-07-22 1984-01-10 Rca Corporation Method of making a cathode-ray tube having a conductive internal coating exhibiting reduced arcing current
US5147460A (en) * 1990-05-21 1992-09-15 Acheson Industries, Inc. Internal coating materials for a cathode ray tube
JPH07282744A (en) * 1994-04-06 1995-10-27 Hitachi Powdered Metals Co Ltd Inside paint for cathode ray tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4272701A (en) * 1979-08-27 1981-06-09 Gte Products Corporation Cathode ray tube arc limiting coating
US4425377A (en) * 1981-07-22 1984-01-10 Rca Corporation Method of making a cathode-ray tube having a conductive internal coating exhibiting reduced arcing current
US5147460A (en) * 1990-05-21 1992-09-15 Acheson Industries, Inc. Internal coating materials for a cathode ray tube
JPH07282744A (en) * 1994-04-06 1995-10-27 Hitachi Powdered Metals Co Ltd Inside paint for cathode ray tube

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