KR20000013376A - The cathode structure for color cathode ray tube - Google Patents

The cathode structure for color cathode ray tube Download PDF

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Publication number
KR20000013376A
KR20000013376A KR1019980032204A KR19980032204A KR20000013376A KR 20000013376 A KR20000013376 A KR 20000013376A KR 1019980032204 A KR1019980032204 A KR 1019980032204A KR 19980032204 A KR19980032204 A KR 19980032204A KR 20000013376 A KR20000013376 A KR 20000013376A
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South Korea
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layer
heater
ray tube
cathode ray
cathode
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KR1019980032204A
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Korean (ko)
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박공석
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구자홍
엘지전자 주식회사
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Priority to KR1019980032204A priority Critical patent/KR20000013376A/en
Publication of KR20000013376A publication Critical patent/KR20000013376A/en

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    • 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
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • 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
    • 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
    • H01J29/028—Mounting or supporting arrangements for flat panel cathode ray tubes, e.g. spacers particularly relating to electrodes

Abstract

PURPOSE: The common temperature of a heater is to be raised, a wavelength intensity to be improved and leaking electrical current to be decreased. CONSTITUTION: The structure comprises a heating line made of rhenium and tungsten (121) arranged in a coil shape on the center, a heat-resisting dielectric layer supporting the heating line, the first layer (122a) made of large grain size materials on the dielectric layer of a heater for a color cathode ray tube which comprises darkening layers for the increase of radiant heat and the prevention of diffused reflection, and the second layer(122b) made of smaller grain size materials than the first layer.

Description

칼라음극선관용 음극구조체Cathode structure for color cathode ray tube

본 발명은 칼라음극선관용 음극구조체에 관한 것으로서, 특히 히터의 상용온도, 파단강도 특성을 향상시키고, 히터와 음극간 누설전류를 저감하기 위한 음극구조체의 구조에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode structure for color cathode ray tubes, and more particularly to a structure of a cathode structure for improving the commercial temperature and breaking strength characteristics of a heater and for reducing leakage current between the heater and the cathode.

일반적인 칼라음극선관용 전자총은 도 1 에 도시된 바와 같이, 전원이 인가되면 발열하는 히터(1)와, 상기 히터(1)로부터 열을 전달받아 열전자를 방사하는 음극(2)과, 상기 음극(2)으로부터 방사된 열전자를 제어, 집속, 가속시키는 다수의 전극(3)과, 상기 다수의 전극(3) 및 주변부품들을 지지하는 비드 글라스(4)와, 전원을 공급함과 동시에 음극선관 내부의 기밀성을 유지하는 스템(5)으로 구성된다.As shown in FIG. 1, a general electron gun for color cathode ray tubes includes a heater 1 that generates heat when power is applied, a cathode 2 that receives heat from the heater 1, and radiates hot electrons, and the cathode 2. A plurality of electrodes 3 for controlling, focusing and accelerating hot electrons emitted from the bead, a bead glass 4 supporting the plurality of electrodes 3 and peripheral parts, and airtightness inside the cathode ray tube while supplying power. It consists of a stem (5) to hold.

이때, 상기 음극(2)으로는 상용시의 최고 부하가 1A/㎠ 이하인 산화물 음극이 주로 사용되며, 그 구성은 도 2 와 같이 발열체인 히터(1)가 삽입되는 원통형의 슬리이브(21)와, 상기 슬리이브(21)에 삽입된 히터(1)로부터 열을 전달받아 열전자를 방사하도록 전자방사물질(22)이 도포된 캡(23)과, 상기 슬리이브(21)를 지지하는 홀더(24)로 이루어진다.At this time, an oxide cathode having a maximum load of 1 A / cm 2 or less at the time of commercial use is mainly used as the cathode 2, and a configuration thereof includes a cylindrical sleeve 21 into which the heater 1, which is a heating element, is inserted. A cap 23 coated with an electron-emitting material 22 to radiate hot electrons from the heater 1 inserted into the sleeve 21, and a holder 24 supporting the sleeve 21. )

또한, 상기 히터(1)는 도 3 과 같이 음극(2)의 슬리이브(21)에 삽입되어 발열하는 발열부(11)와, 열손실을 차단하며 절연시키는 입력부(12)와, 전원공급을 위해 스템(5)에 연결된 히터서포터(도면상에는 도시되지 않음)에 용접되는 용접부(13)로 구성되는데, 상기 발열부(11)는 도 4 와 같이 중심부에 발열선(11a)인 레늄-텅스텐선이 코일형상으로 꼬아져 있고, 그 주변에 코일형상의 발열선(11a)을 지지하는 고온에 강한 절연층(11b)이 형성되며, 상기 절연층(11b)의 외곽에는 복사열 증대와 난반사 방지를 위한 흑화층(11c)이 형성된다.In addition, the heater 1 is inserted into the sleeve 21 of the cathode 2 as shown in FIG. 3, the heat generating portion 11 to generate heat, the input portion 12 to block and insulate the heat loss, and to supply power It consists of a welding portion 13 welded to a heater supporter (not shown in the drawing) connected to the stem 5, wherein the heat generating portion 11 is a rhenium-tungsten wire which is a heating wire 11a in the center as shown in FIG. The insulation layer 11b which is twisted in the coil shape and is strong against the high temperature which supports the coil-shaped heating line 11a is formed in the periphery, and the blackening layer for increasing radiant heat and preventing diffuse reflection is formed on the outer side of the insulation layer 11b. 11c is formed.

이와 같이 구성된 상태에서 스템(5)을 통해 전원이 인가되면 이 전원은 히터서포터를 통해 히터(1)의 용접부(13)에 인가되어 발열부(11)를 발열시키게 된다.When the power is applied through the stem 5 in the state configured as described above, the power is applied to the welding part 13 of the heater 1 through the heater supporter to generate the heat generating part 11.

상기 히터(1)가 발열되면 이 열이 음극(2)의 캡(23)에 전달되고, 캡(23)의 상면에 도포되어 있는 전자방사물질(22)을 가열하게 되어 이로부터 열전자가 방사되며, 방사된 열전자는 다수의 전극(3)을 통과하면서 활성화된다.When the heater 1 heats up, this heat is transferred to the cap 23 of the cathode 2, and heats the electron emitting material 22 coated on the upper surface of the cap 23, thereby radiating hot electrons. The radiated hot electrons are activated while passing through the plurality of electrodes 3.

이와 같이 히터(1)는 음극선관 구동을 위한 최초 열원역할을 하는 중요 부품으로서, 음극선관의 동작중에 안정적으로 열을 공급해야 하므로 발열선(11a)을 지지하면서 고온에 견디는 절연층(11b)을 형성한 것이다.In this way, the heater 1 is an important component that serves as the first heat source for driving the cathode ray tube. Since the heater 1 must be stably supplied during operation of the cathode ray tube, the heater 1 forms an insulating layer 11b that withstands high temperature while supporting the heating line 11a. It is.

이때, 상기 절연층(11b)의 재료로 사용되는 알루미나 용액(Alumina Suspension)은 적정한 파단강도를 유지시키면서 음극선관의 전기적 특성을 얻기 위해 도 5 와 같이 평균입경이 9.3㎛, 입경범위가 0.1∼80㎛ 정도의 입도 분포를 갖게 되며, 전기 영동법을 이용한 전용 전착기를 활용하여 절연층(11b)을 형성하게 된다.At this time, the alumina solution (Alumina Suspension) used as the material of the insulating layer 11b has an average particle diameter of 9.3 μm and a particle size range of 0.1 to 80 as shown in FIG. 5 in order to obtain electrical characteristics of the cathode ray tube while maintaining an appropriate breaking strength. It will have a particle size distribution of about μm, and the insulating layer 11b is formed by utilizing a dedicated electrodeposition machine using an electrophoresis method.

이와 같이 구성하게 되면 상기 히터(1)의 상용온도가 평균 785℃b가 된다.When configured in this way, the commercial temperature of the heater 1 is an average of 785 ℃ b.

그러나 이러한 종래 산화물 음극의 히터는 절연과 형상유지를 위한 절연층을 입경이 큰 알루미나를 이용하여 형성하게 되므로 그 표면이 거칠고 내부에는 기공이 있어 알루미나 입자가 외부의 충격에 의해 탈락되어 전자총의 전극간 방전과 섀도우마스크 막힘의 주된 원인이 되며, 이로 인해 절연층의 파단강도가 평균 155g/Φ 정도로 약하게 나타나며, 히터와 음극간 누설전류값이 최고 1.9㎂까지 증가되어 음극선관의 동작중 안정적인 열공급에 어려움이 있었다.However, since the heater of the conventional oxide cathode is formed by using an alumina having a large particle diameter, the insulating layer for insulation and shape maintenance is rough, and the pores are inside, so that the alumina particles are eliminated by an external impact and the interelectrode of the electron gun is removed. It is the main cause of discharge and shadow mask clogging, and this causes the breakage strength of the insulation layer to be weakly about 155g / Φ, and the leakage current between heater and cathode increases up to 1.9㎂, making it difficult to supply stable heat during operation of cathode ray tube. There was this.

또한, 전류밀도가 2A/㎠ 이상이 요구되는 고품위용 음극선관에서는 상용온도가 1025℃(최고 1050℃)에 이르게 되는데, 산화물 음극용 히터는 상용온도가 785℃b 정도이므로 고품위용 음극선관 또는 디지털 음극선관 등에는 적용이 불가능하였다.In addition, in the high quality cathode ray tube requiring a current density of 2 A / cm 2 or more, the commercial temperature reaches 1025 ° C. (up to 1050 ° C.). The heater for the oxide cathode has a commercial temperature of about 785 ° C. Application to cathode ray tubes was not possible.

본 발명은 이러한 점을 감안하여 제안된 것으로, 히터의 상용온도, 파단강도 특성을 향상시키고, 히터와 음극간 누설전류를 저감하여 고품위용 음극선관에 적용 가능하게 하는 데 그 목적이 있다.The present invention has been proposed in view of this point, and has an object of improving the commercial temperature and breaking strength characteristics of the heater, and reducing the leakage current between the heater and the cathode to be applicable to a high quality cathode ray tube.

이러한 목적을 달성하기 위해 본 발명은 중심부에 발열선인 레늄-텅스텐선이 코일형상으로 꼬아져 있고, 그 주변에 코일형상의 발열선을 지지하는 고온에 강한 절연층이 형성되며, 상기 절연층의 외곽에는 복사열 증대와 난반사 방지를 위한 흑화층이 형성되어 있는 칼라음극선관용 히터에 있어서, 상기 절연층은 입경이 큰 재질로 형성된 제 1 층과, 상기 제 1 층보다 입경이 작은 재질로 형성된 제 2 층으로 구성된 것을 특징으로 한다.In order to achieve the above object, the present invention is a rhenium-tungsten wire, which is a heating wire, is twisted in a coil shape at a central portion thereof, and an insulating layer resistant to high temperature is formed around the insulating layer. In a heater for a color cathode ray tube having a blackening layer for increasing radiant heat and preventing diffuse reflection, the insulating layer includes a first layer formed of a material having a larger particle diameter and a second layer formed of a material having a smaller particle diameter than the first layer. Characterized in that configured.

도 1 은 일반적인 칼라음극선관의 전자총 구성도.1 is a configuration diagram of an electron gun of a general color cathode ray tube.

도 2 는 종래 칼라음극선관의 전자총에 적용되는 음극(산화물 음극) 구성도.Figure 2 is a configuration of a cathode (oxide cathode) applied to the electron gun of the conventional color cathode ray tube.

도 3 은 종래 칼라음극선관의 히터 구성도.3 is a heater configuration diagram of a conventional color cathode ray tube.

도 4 는 도 3 의 A부 상세도.4 is a detailed view of portion A of FIG. 3;

도 5 는 종래 히터의 절연액용 알루미나 입자의 입도 분포도.5 is a particle size distribution diagram of alumina particles for insulating liquid of a conventional heater.

도 6 은 본 발명에 의한 칼라음극선관의 전자총에 적용되는 음극(함침형 음극) 구성도.6 is a configuration diagram of a cathode (impregnated cathode) applied to an electron gun of a color cathode ray tube according to the present invention.

도 7 은 도 6 의 B부 상세도.FIG. 7 is a detailed view of portion B of FIG. 6; FIG.

도 8 은 본 발명에 의한 히터의 2차 절연액용 알루미나 입자의 입도 분포도.8 is a particle size distribution diagram of alumina particles for secondary insulating solution of a heater according to the present invention.

도 9 는 본 발명에 의한 히터와 종래 히터의 특성 비교도로서,9 is a characteristic comparison diagram of a heater and a conventional heater according to the present invention;

(가)는 상용온도 비교도.(A) Comparison of commercial temperature.

(나)는 누설전류 비교도.(B) is a leakage current comparison diagram.

(다)는 파단강도 비교도.(C) is also the breaking strength comparison.

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

101 : 음극 111: 홀더101: cathode 111: holder

112 : 전자방사물질 112a : 텅스텐 펠럿(W-pellet)112: electron-emitting material 112a: tungsten pellets (W-pellet)

112b : 오스늄과 루데늄(Os-Ru) 113 : 슬리이브112b: Osnium and Rudenium (Os-Ru) 113: Sleeve

114 : 리본 102 : 히터114: ribbon 102: heater

121 : 발열선 122 : 절연층121: heating wire 122: insulating layer

122a : 제 1 층 122b : 제 2 층122a: first layer 122b: second layer

123 : 흑화층123: blackening layer

이하, 본 발명을 첨부한 도면을 참조하여 상세히 설명하면 다음과 같다.Hereinafter, described in detail with reference to the accompanying drawings of the present invention.

도 6 은 본 발명에 의한 칼라음극선관용 음극구조체의 구성도로서, 음극(101)으로 고전류밀도용에 적합한 함침형 음극을 사용하며, 상기 함침형 음극은 지지체인 홀더(111)와, 상부에 전자방사물질(112)이 형성된 원통형의 슬리이브(113)와, 상기 슬리이브(113)와 홀더(111)를 연결하는 최소의 두께와 폭을 가진 다수의 리본(114)으로 구성된다.6 is a schematic diagram of a cathode structure for a color cathode ray tube according to the present invention, and an impregnated cathode suitable for high current density is used as the cathode 101, and the impregnated cathode is a holder 111 as a support and an electron on the top. It consists of a cylindrical sleeve 113 formed with the radiation material 112, and a plurality of ribbons 114 having a minimum thickness and width connecting the sleeve 113 and the holder 111.

이때, 상기 전자방사물질(112)은 다공질인 텅스텐 펠럿(W-pellet)(112a)을 고진공과 1800℃ 정도의 함침로에서 함침시켜 오랜 기간동안 고밀도의 전자를 방사하도록 하는데, 상기 음극(101)을 고품위용 음극선관에 적용시 히터(102)가 상용온도인 1050℃b까지 올라가더라도 무리한 휘발과 열변형이 발생하지 않도록 상기 텅스텐 펠럿(W-pellet)(112a)의 상부에 오스늄과 루데늄(Os-Ru)(112b)을 스퍼터링 방법으로 덧입혀 구성하게 된다.At this time, the electron-emitting material 112 is impregnated in a porous tungsten pellet (W-pellet) (112a) in the high vacuum and the impregnation furnace of about 1800 ℃ to emit a high-density electron for a long time, the cathode 101 When applied to a high-quality cathode ray tube, even if the heater 102 rises to 1050 ° C., which is a commercial temperature, on the top of the tungsten pellet (W-pellet) 112a so as not to cause excessive volatilization and thermal deformation. The (Os-Ru) 112b is overlaid by the sputtering method.

또한, 상기 음극(101)에 삽입되는 히터(102)는 중심부에 발열선(121)인 레늄-텅스텐선이 코일형상으로 꼬아져 있고, 그 주변에 코일형상의 발열선(121)을 지지하는 고온에 강한 절연층(122)이 형성되며, 상기 절연층(122)의 외곽에는 복사열 증대와 난반사 방지를 위한 흑화층(123)이 형성되어 있다.In the heater 102 inserted into the cathode 101, a rhenium-tungsten wire, which is a heating wire 121, is twisted in a coil shape at a central portion thereof, and is resistant to high temperatures that support the coil-shaped heating wire 121 around the heater 102. The insulating layer 122 is formed, and the blackening layer 123 is formed outside the insulating layer 122 to increase radiant heat and prevent diffuse reflection.

이때, 도 7 및 도 8 과 같이 상기 절연층(122)은 두 개의 층(122a)(122b)으로 구성되는데, 입경이 0.1∼80㎛의 범위내에 있고 평균입경이 9.3㎛인 알루미나를 이용하여 제 1 층(122a)을 형성하고(종래와 동일구조), 적외선 램프와 뜨거운 공기로 건조시킨 후 입경이 0.1∼4.3㎛의 범위내에 있고 평균입경이 0.63㎛인 알루미나를 이용하여 제 2 층(122b)을 형성하여 건조한 것이다.7 and 8, the insulating layer 122 is composed of two layers 122a and 122b. The insulating layer 122 is made of alumina having a particle diameter in the range of 0.1 to 80 μm and an average particle diameter of 9.3 μm. The second layer 122b is formed using alumina having a particle size in the range of 0.1 to 4.3 µm and an average particle diameter of 0.63 µm after forming one layer 122a (same structure) and drying with an infrared lamp and hot air. To form a dry one.

이와 같이 구성하게 되면 히터(102)의 절연층(122)에 기공이 적어지고 밀도가 향상되어 품위가 향상된 절연층(122)을 얻을 수 있고, 이를 적용한 히터(102)의 상용온도가 도 9 의 (가)와 같이 평균 1025℃b, 최대 1050℃b가 되어 종래 산화물 음극용 히터에 비해 상용온도가 평균적으로 240℃b나 높게 올려도 신뢰성에 문제가 없게 된다.In this configuration, the pores are reduced in the insulating layer 122 of the heater 102 and the density is improved to obtain the insulating layer 122 having improved quality, and the commercial temperature of the heater 102 to which the same is applied is shown in FIG. 9. As shown in (A), the average temperature is 1025 ° Cb and the maximum 1050 ° Cb, so there is no problem in reliability even if the commercial temperature is increased to 240 ° Cb or higher on average compared to the conventional oxide cathode heater.

이에 따라, 본 발명에 의한 히터(102)는 상용온도가 1025℃b이고 최대온도가 1050℃b에 이르는 고품위용 음극선관에 적용 가능하게 되고, 히터(102)의 열화를 방지할 수 있으므로 히터(102)와 음극(101)간의 누설전류는 평균적으로 도 9 의 (나)와 같이 0.2㎂이고 최대 0.35㎂정도로 낮출 수 있어 고전류밀도(2A/㎠ 이상)형의 음극선관에도 적용 가능하게 된다.Accordingly, the heater 102 according to the present invention can be applied to a high quality cathode ray tube having a commercial temperature of 1025 ° C. and a maximum temperature of 1050 ° C., and can prevent deterioration of the heater 102. The leakage current between the 102 and the cathode 101 is, on average, 0.2 낮 as shown in FIG. 9 (B), and can be reduced to about 0.35 최대 at maximum, so that it can be applied to a cathode ray tube of a high current density (2 A / cm 2 or more) type.

또한, 상기 히터(102)의 절연층(122)을 2개의 층으로 구성함에 따라 밀도가 향상되므로 절연층(122)의 파단강도(소결강도)도 도 9 의 (다)와 같이 평균 210g/Φ 정도로 향상시킬 수 있어 결과적으로 히터(102)에 기계, 열, 전기적인 충격이 가해지더라도 이에 충분히 견디고, 절연물질 탈락(분진형태)으로 인한 전자총 극간 스트레이 발생을 현저히 줄일 수 있는 것이다.In addition, since the density is improved by configuring the insulating layer 122 of the heater 102 in two layers, the breaking strength (sintering strength) of the insulating layer 122 is also 210 g / Φ on average as shown in FIG. As a result, even if mechanical, thermal and electrical shocks are applied to the heater 102, it is sufficiently resistant to this and can significantly reduce the occurrence of electron gun interpolar strays due to the insulation material falling off (dust form).

이상에서 설명한 바와 같이 본 발명은 히터의 절연층을 두 개의 층으로 구성하되 입도가 큰 재질로 제 1 층을 구성하고, 입도가 작은 재질로 제 2 층을 구성함으로써 종래 히터에 비해 상용온도, 파단강도를 높일 수 있고, 히터와 음극간 누설전류를 줄일 수 있어 이러한 히터가 적용되는 칼라음극선관의 신뢰성을 향상시킬 수 있음은 물론 고품위용 음극선관에도 적용 가능하게 되는 효과가 있다.As described above, the present invention comprises two layers of the insulating layer of the heater, but the first layer is composed of a material having a large particle size, and the second layer is formed of a material having a small particle size, and thus, the temperature of the heater is higher than that of a conventional heater. The strength can be increased, and the leakage current between the heater and the cathode can be reduced, thereby improving the reliability of the color cathode ray tube to which the heater is applied, as well as being applicable to high quality cathode ray tube.

Claims (2)

중심부에 발열선인 레늄-텅스텐선이 코일형상으로 꼬아져 있고, 그 주변에 코일형상의 발열선을 지지하는 고온에 강한 절연층이 형성되며, 상기 절연층의 외곽에는 복사열 증대와 난반사 방지를 위한 흑화층이 형성되어 있는 칼라음극선관용 히터에 있어서,In the center, a rhenium-tungsten wire, which is a heating wire, is twisted in a coil shape, and an insulating layer resistant to high temperature to support the coil-shaped heating wire is formed around the black layer, and the blackening layer is formed outside the insulating layer to increase radiant heat and prevent diffuse reflection. In the heater for color cathode ray tubes formed, 상기 절연층은 입경이 큰 재질로 형성된 제 1 층과, 상기 제 1 층보다 입경이 작은 재질로 형성된 제 2 층으로 구성된 것을 특징으로 하는 칼라음극선관용 음극구조체.The insulating layer is a cathode structure for a color cathode ray tube, characterized in that consisting of a first layer formed of a material having a large particle diameter, and a second layer formed of a material having a smaller particle size than the first layer. 제 1 항에 있어서,The method of claim 1, 상기 절연층의 제 1 층을 형성하는 재질은 입경이 0.1∼80㎛의 범위내에 있고 평균입경이 9.3㎛인 알루미나이며, 절연층의 제 2 층을 형성하는 재질은 입경이 0.1∼4.3㎛의 범위내에 있고 평균입경이 0.63㎛인 알루미나인 것을 특징으로 하는 칼라음극선관용 음극구조체.The material for forming the first layer of the insulating layer is alumina having a particle size in the range of 0.1 to 80 μm and the average particle size is 9.3 μm, and the material for forming the second layer of the insulating layer has a particle size of 0.1 to 4.3 μm. A cathode structure for a color cathode ray tube, characterized in that the alumina having an average particle diameter of 0.63㎛.
KR1019980032204A 1998-08-07 1998-08-07 The cathode structure for color cathode ray tube KR20000013376A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100446227B1 (en) * 2002-10-18 2004-08-30 엘지.필립스디스플레이(주) Heater for CRT

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JPS579032A (en) * 1980-06-20 1982-01-18 Toshiba Corp Manufacture of cathode for cathode-ray tube
JPS58115732A (en) * 1981-12-28 1983-07-09 Toshiba Corp Manufacturing method of heater for indirectly heated type cathode
JPH01304635A (en) * 1988-06-01 1989-12-08 Hitachi Ltd Heater for heating cathode of cathode-ray tube and cathode-ray tube using same
JPH0337988A (en) * 1989-07-01 1991-02-19 Hitachi Ltd Inorganic insulation heater and manufacture thereof and cathode-ray tube using same heater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS579032A (en) * 1980-06-20 1982-01-18 Toshiba Corp Manufacture of cathode for cathode-ray tube
JPS58115732A (en) * 1981-12-28 1983-07-09 Toshiba Corp Manufacturing method of heater for indirectly heated type cathode
JPH01304635A (en) * 1988-06-01 1989-12-08 Hitachi Ltd Heater for heating cathode of cathode-ray tube and cathode-ray tube using same
JPH0337988A (en) * 1989-07-01 1991-02-19 Hitachi Ltd Inorganic insulation heater and manufacture thereof and cathode-ray tube using same heater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100446227B1 (en) * 2002-10-18 2004-08-30 엘지.필립스디스플레이(주) Heater for CRT

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