KR910007697B1 - Method of manufacturing a cathode for color crt - Google Patents

Method of manufacturing a cathode for color crt Download PDF

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KR910007697B1
KR910007697B1 KR1019880016830A KR880016830A KR910007697B1 KR 910007697 B1 KR910007697 B1 KR 910007697B1 KR 1019880016830 A KR1019880016830 A KR 1019880016830A KR 880016830 A KR880016830 A KR 880016830A KR 910007697 B1 KR910007697 B1 KR 910007697B1
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cathode
manufacturing
ray tube
color crt
emission characteristics
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KR1019880016830A
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Korean (ko)
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KR900010851A (en
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함성우
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삼성전관 주식회사
김정배
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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

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
  • Luminescent Compositions (AREA)

Abstract

A cathode for a color cathode ray tube is manufactured by mixing a suspension of alkali earth metal carbonate as an electron emission material with 0.1-20 wt.% Sc2O3 and 0.01-10 wt.% In2O3 heat- treated at the oxidation condition of 800-1200 deg.C for at least 1hr, agitating the mixt. by the ball-mill, and coating it on the base matal containing a reducing agent i.e. Mg or Si. The cathode has an excellent emission capacity.

Description

칼라음극선관용 캐소오드 제조방법Method of manufacturing cathode for color cathode ray tube

제1도는 일반적인 음극선관용 캐소오드의 단면도.1 is a cross-sectional view of a cathode for a typical cathode ray tube.

제2도는 본 발명에 의한 캐소오드와 종래 캐소오드의 에미션특성 비교표.2 is a comparison table of the emission characteristics of the cathode and the conventional cathode according to the present invention.

본 발명은 칼라음극선관의 캐소오드 제작방법에 관한 것으로서, 특히 캐소오드에 에미션(Emission) 특성을 크게 향상시킬 수 있는 것에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cathode of a color cathode ray tube, and more particularly, to an improvement in emission characteristics of a cathode.

일반적으로 종래의 캐소오드의 전자방출원으로서 히이터에 의해 약 800℃로 가열되는 전자방사물질은 슬리이브의 선단부에 결합된 캡형 베이스메탈의 표면에 부착되는 Ba, Ca, Sr의 산화물이며, 상기 베이스메탈은 Mg, Si등의 환원제를 미량 함유한 고순도 Ni을 주재료로 하고 있다. 이러한 캐소오드는 히이터가 적열되면서 이에 의해 슬리이브와 베이스메탈이 가열되기 때문에 전자를 방출하는 것이다.In general, the electron-emitting material heated to about 800 ° C. by a heater as an electron emission source of a conventional cathode is an oxide of Ba, Ca, and Sr attached to the surface of a cap base metal bonded to the tip of the sleeve, and the base The metal is made of high purity Ni containing a small amount of reducing agents such as Mg and Si as a main material. These cathodes emit electrons because the heaters heat up, thereby heating the sleeve and base metal.

즉 히이터가 적열되면서 상기 베이스메탈과 전자방사물질 사이의 계면에서 환원반응이 이루어지게 되는데, 이는 계면으로 확산되는 베이스메탈의 환원제와 전자방사물질의 산화바륨에 의해 이루어진다. 이때에 환원금속산화물과 산화바륨의 복합산화물에 의해 상기 계면을 중간층이 형성되며, 이에 의해 캐소오드의 수명특성이 변화되며, 에미션 특성에 영향을 끼치는 높은 전류밀도(1A/Cm2이상)의 실현이 어렵게 된다.That is, as the heater is glowing, a reduction reaction is performed at the interface between the base metal and the electron emitting material, which is performed by the reducing agent of the base metal and the barium oxide of the electron emitting material diffused to the interface. At this time, the intermediate layer is formed at the interface by the composite oxide of the reducing metal oxide and the barium oxide, thereby changing the lifetime characteristics of the cathode and having a high current density (1 A / Cm 2 or more) that affects the emission characteristics. It becomes difficult to realize.

본 발명은 중간층의 형성을 억제하여 고전류밀도화를 실현함으로써 에미션특성을 크게 향상시킬 수 있는 칼라음극선관용 캐소오드의 제조방법을 제공함에 목적이 있다.An object of the present invention is to provide a method for producing a cathode for a color cathode ray tube, which can greatly improve emission characteristics by suppressing formation of an intermediate layer and realizing high current density.

상기의 목적을 달성하기 위하여 본 발명은, 중간층의 생성을 억제할 수 있는 희토류 산화물인 Sc2O3와 In2O3를 기존의 전자방사물질(탄산염)에 포함시키도록 특징이 있다.In order to achieve the above object, the present invention is characterized by including Sc 2 O 3 and In 2 O 3 , which are rare earth oxides capable of suppressing formation of an intermediate layer, in an existing electron emitting material (carbonate).

우선 그 제법을 설명하면 다음과 같다.First, the preparation method is as follows.

800℃∼1200℃의 산화 분위기에서 1시간 이상 열처리한 Sc2O30.1∼20% 및 In2O30.01∼10wt%를 알카리토류 금속탄산염의 현탁액에 섞은 후 볼밀(Ball Mill)로서 교반한다. 이와 같이 한 후 이를 스프레이어(Sprayer)로서 베이스메탈에 도포한다.0.1 to 20% of Sc 2 O 3 and 0.01 to 10 wt% of In 2 O 3 heat-treated in an oxidizing atmosphere at 800 ° C. to 1200 ° C. for at least 1 hour are mixed with a suspension of alkaline earth metal carbonate, followed by stirring as a ball mill. After doing this, it is applied to the base metal as a sprayer.

이와 같이 한 후 본 발명자가 행한 비교실험에 의하면 제2도에 도시된 바와 같다. 이때의 전류밀도는 통상의 것에 약 4배로 한것으로서 이에 따른 종래 전자방사물질이 도포된 캐소오드의 에미션특성은 쇄선으로 도시되어 있고 본 발명에 의한 캐소오드의 에미션특성은 실선으로 도시되어 있다. 이를 비교하여 보면 본 발명에 의해 캐소오드의 에미션특성이 현격히 향상되어 있음을 알 수 있다. 즉 중간층 형성을 억제하는 희토류 산화물인 In2O3및 Sc2O3를 함유시킴으로써 1A/Cm2이상의 고전류 밀도의 실현이 가능하게 된다.After doing this, according to the comparative experiment conducted by the present inventors, it is as shown in FIG. At this time, the current density is about 4 times that of the conventional one, and accordingly, the emission characteristics of the cathode coated with the conventional electrospinning material are shown by the dashed line, and the emission characteristics of the cathode according to the present invention are shown by the solid line. . Comparing this, it can be seen that the emission characteristics of the cathode are significantly improved by the present invention. That is, by containing In 2 O 3 and Sc 2 O 3 , which are rare earth oxides that suppress the formation of the intermediate layer, high current density of 1 A / Cm 2 or higher can be realized.

본 발명은 전기한 바와 같이 종래의 캐소오드에 비해 월등한 에미션특성을 갖는 캐소오드의 생산이 가능하게 함으로써 성능이 우수한 칼라브라운관의 제작이 가능케 한다.As described above, the present invention enables production of a cathode-ray cathode tube having superior emission characteristics as compared to conventional cathodes, thereby making it possible to manufacture color-brown tubes with excellent performance.

Claims (1)

통상의 알카리 탄산염 전자방사물질에, 800℃∼1200℃의 분위기에서 1시간이상 열처리된 Sc2O30.1∼20wt% 와 In2O30.01∼10wt%를 혼합하여서 환원제가 포함된 베이스메탈의 표면에 도포하도록 하는 칼라음극선관용 캐소오드 제조방법.The surface of the base metal containing a reducing agent by mixing a conventional alkali carbonate electrospinning material with Sc 2 O 3 0.1-20 wt% and In 2 O 3 0.01-10 wt% by heat treatment for 1 hour in an atmosphere of 800 ° C. to 1200 ° C. Method for producing a cathode for a color cathode ray tube to be applied to.
KR1019880016830A 1988-12-17 1988-12-17 Method of manufacturing a cathode for color crt KR910007697B1 (en)

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KR910007697B1 true KR910007697B1 (en) 1991-09-30

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