KR100234040B1 - Manufacture of cathode-ray tube - Google Patents
Manufacture of cathode-ray tube Download PDFInfo
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- KR100234040B1 KR100234040B1 KR1019960055315A KR19960055315A KR100234040B1 KR 100234040 B1 KR100234040 B1 KR 100234040B1 KR 1019960055315 A KR1019960055315 A KR 1019960055315A KR 19960055315 A KR19960055315 A KR 19960055315A KR 100234040 B1 KR100234040 B1 KR 100234040B1
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- brown tube
- alumina
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/22—Heaters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2209/00—Apparatus and processes for manufacture of discharge tubes
- H01J2209/01—Generalised techniques
- H01J2209/012—Coating
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- Manufacturing & Machinery (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
본 발명은 브라운관용 음극히터의 발열선에 코딩되는 코팅막의 핀홀 발생 방지 및 누설전류값을 저감시킬 수 있는 브라운관용 음극히터의 코팅방법을 개시한다.Disclosed is a method for coating a negative electrode heater for a brown tube capable of preventing the occurrence of pinholes in a coating film coded on a heating wire of a brown tube negative electrode heater and reducing a leakage current value.
본 발명의 브라운관용 음극히터의 코팅방법은 코팅면의 조도향상과 강도유지, 완전 절연을 위하여 주전해질 량은 0.9wt%이상, 1.5wt%이하로 제한하고, 부수적인 기능은 접착제(Binder) 역할을 하는 질산 마그네슘[Mg(NO3)2]을 사용하되 최적의 품질과 생산성을 내는 1.1-1.3wt%로 넣어 코팅하므로써, 원하는 개량된 성능의 히터를 얻는다. 주전해질 양이 1.5wt%이상 되면, 핀홀과 요철이 발생되며, 0.9wt%이하가 되면, 전착량이 부족하면서 표면이 거칠고 강도가 약해서 코팅면이 탈락하는 현상이 발생되므로, 전해질의 조성범위는 위와 같이 한정된다.In order to improve the roughness of the coating surface and to maintain the strength and to ensure complete insulation of the negative electrode heater for the brown tube of the present invention, the main electrolytic amount is limited to not less than 0.9 wt% and not more than 1.5 wt%, and the auxiliary function is a binder (Mg (NO 3 ) 2 ], which is used in the present invention, is coated with 1.1-1.3 wt%, which gives optimum quality and productivity, to obtain a desired improved performance heater. When the amount of main electrolyte is more than 1.5 wt%, pinholes and irregularities are generated. When the amount of main electrolyte is less than 0.9 wt%, the surface is rough and the strength is weak due to lack of electrodeposition, As well.
Description
본 발명은 브라운관용 음극 히터의 제조방법에 관한 것으로서, 특히 발열체인 히터에 2중으로 코팅되는 코팅막의 코팅방법에 관한 것이다.The present invention relates to a method of manufacturing a cathode-ray tube for a brown tube, and more particularly, to a method of coating a coating film that is double coated on a heater which is a heating element.
표시매체로서 가장 널리 사용되고 있는 브라운관의 품질, 원가 및 생산성을 고려해서 현재 가장 많이 채택되고 있는 간접 가열형 산화물 음극은 민생용 가전품은 물론이고 칼라 디스플레이 튜브와 같은 산업용 단말기에서도 가장 많이 채용되고 있다.Considering the quality, cost, and productivity of cathode ray tube, which is most widely used as a display medium, indirectly heated oxide cathodes, which are currently most widely used, are most widely used in industrial terminals such as color display tubes as well as consumer electronics.
제 1 도는 종래의 기술에 따른 브라운관용 전자총의 구조를 도시한 종단면도이고, 제 2 도는 제 1 도의 전자총에 사용되는 히터 완성품(Heater Assembly)의 구성도이며, 제 3 도는 제 2 도의 "A"부분을 절단한 단면도이다.FIG. 1 is a longitudinal sectional view showing the structure of a conventional electron gun for a brown tube, FIG. 2 is a view of a heater assembly used in an electron gun of FIG. 1, Fig.
제 1 도 내지 제 3 도를 참조하면, 전자총이 그 기능을 발휘하기 위해서는 브라운관용 발열체(Heater : 2)와, 히터 발열선(F)의 고저항 및 제 2 도와 제 3 도에 도시된 구조적인 관점에서 5-6초의 극히 짧은 시간내에 760-790℃의 고온의 열이 안정적으로 계속 유지되어야 한다.Referring to FIGS. 1 to 3, in order for the electron gun to exhibit its function, a high resistance of the Braun tube heating element 2 and the heater heating line F, and a high resistance of the heater heating line F, The heat of high temperature of 760-790 캜 must be stably maintained within a very short time of 5-6 seconds.
브라운관용 음극 히터는 발열체인 히터가 일정한 인가 전압을 공급받아 순간적으로 고온을 열을 발휘해야 하는 동시에, 히터 제조공정에서는 생산성 또한 좋아야 한다. 최근에는 브라운관용 부품의 소요량 급증으로 필요 부품의 가공기술이 날로 발달한 지금은 기술수준이 일반적으로 높아서 생산성과 품질이 이익에 직결되어 있기 때문에 기술인력, 고정밀도의 장비, 최적의 작업조건보다도 원료 물질의 품질(품위) 선택이 모든 특성에 절대적으로 작용한다.In the cathode tube heater for brown tube, the heater, which is a heating element, must exert a high temperature instantaneously by being supplied with a constant applied voltage, and at the same time, the productivity in the heater manufacturing process should also be good. Nowadays, due to the rapid increase in the amount of brown tube parts, the processing technology of the required parts has been developed all the time. Since the level of technology is generally high, productivity and quality are directly related to profit. Therefore, The quality (quality) selection of a material is absolutely essential for all characteristics.
제 3 도에 도시된 것처럼, 히터는 맨드릴선 주위에 발열체(F)인 레늄(Rhenium)과 텅스텐이 혼합된 고른 피치(Pitch)로 감긴 텅스텐제 발열선(F)과, 발열선(F)의 주위에 발열선의 고른 피치 그대로의 형상 유지와 강도의 유지를 위해 일정한 분포의 입경을 갖는 부도체이면서 절연, 보온 기능을 갖는 알루미나(G)를 함유하는 제 1 코팅막(G)이 전기영동법에 의해 발열선(F)에 맞닿은 곳에 형성되며, 제 1 코팅막(G)의 표면에는 텅스텐 분말의 도체인 제 2 코팅막(E)이 코팅된다.As shown in FIG. 3, the heater includes a tungsten heating wire F wound around the mandrel wire with a uniform pitch, which is a mixture of rhenium and tungsten, which is a heating element F, The first coating film G containing an alumina (G) having an insulating and thermal insulating function and being a nonconductor having a uniform distribution of particle diameters is maintained in the heating line F by electrophoresis for maintaining the shape of the heating line at an even pitch, And a second coating film E, which is a conductor of tungsten powder, is coated on the surface of the first coating film G.
상기와 같은 구조를 갖는 히터를 제조하기 위하여, 먼저, 절연, 보온, 강도 유지제인 알루미나층(G)을 코팅하게 되는데, 이는 순도가 99.99%이상되는 알루미늄 전극판에전위를 띠게 하고, 코팅(G)전(前)에 클럽에 히터를 30개씩 집어전위를 띠게 한 홀더에 꽂아 알루미나를 함유한 제 1 코팅액중에 담그어 준다.In order to produce a heater having the above structure, an alumina layer (G), which is an insulating, insulating, and strength-retaining agent, is first coated on an aluminum electrode plate having a purity of 99.99% Potentiate, put 30 heaters in the club before coating (G) And then immersed in a first coating liquid containing alumina.
상기 제 1 코팅막의 코팅에서 고형분(입자)으로 있는 알루미나는 부도체이므로Since alumina which is solid (particle) in the coating of the first coating film is an insulator
와전위를 띤 양극(兩極)이 있는 구조라도 전기 영동법에 의해 코팅을 할 수 없어 소기의 목적을 달성할 수가 없으므로 전해질인 Mg(NO3)2, 6H2O를 필요량(예 : 무게비 1.5-2.2wt%)만큼 혼합시켜 부도체인 알루미나 입자 주위에 전해질 막을 형성케한다. 알루미나 입자에전위를 띠게 해서극인 알루미늄 판에서극인 히터 클립으로 전류를 이동시켜 알루미나로 미세한 절연층을 만들어서 절연, 보온, 강도를 유지하는 역할을 하는 층(G)을 제 3 도와 같이 발열체의 표면에 절연층을 전체 두께의 3/4정도 형성시키고, 1차 건조후 그 위에 복사열 증대용 흑체(Dark body). 즉 제 2 코팅막(E)을 형성한 후, 1,650℃의 고온에서 소결하여 히터를 완성한다. Wow Even if a structure having a positively charged anode is used, it can not be coated by the electrophoresis method and the desired purpose can not be achieved. Therefore, it is necessary to mix the necessary amounts of electrolytes Mg (NO 3 ) 2 and 6H 2 O (for example, %) To form an electrolyte membrane around the non-conductor alumina particles. To alumina particles With a potential From an extreme aluminum plate (G), which acts to maintain insulation, insulation, and strength by forming a fine insulation layer with alumina by moving the electric current to the heater clip of the extremity, the insulation layer is formed on the surface of the heating element by about 3/4 of the total thickness After the primary drying, a black body for increasing radiant heat thereon. That is, after forming the second coating film (E), the heater is completed by sintering at a high temperature of 1,650 캜.
제 2 도에 도시된 히터 절연부(A)를 절단하여 광학 현미경으로 250배 확대해서 보면, 제 4 도와 같이 중앙부는 맨드릴이 녹은 원형의 공간이고, 그 공간의 외측으로 발열선(F)과, 두꺼운 절연층(G) 및 검정의 흑체층(E)이 위치하고 있다.The heater insulating portion A shown in FIG. 2 is cut and enlarged 250 times by an optical microscope. The center portion is a circular space in which the mandrel is melted, and the heating wire F is formed outside the space, The insulating layer G and the black body layer E of black are located.
코팅 작업성을 높이고 열적, 고압의 전기적, 기구적 충격에 견디게 하기 위하여 전해질 및 접착제(Binder) 기능을 하는 물질인 질산마그네슘, Mg(NO3)2을 필요이상 넣고, 건조(120-150℃)하고 소결(1,600-1,650℃)하면 제 5 도 내지 제 7 도와 같이 히터 전체면에 핀홀(Pin hole)이 생겨 발열선(F)에서 음극(1)으로 누설전류가 발생된다. 이로 인하여 화면에 노이즈(Noise) 현상이 발생하는 등 텔레비젼과 모니터의 품위를 손상/떨어뜨리는 문제점이 발생되었다.In order to enhance the coating workability and to withstand the electrical and mechanical impacts of thermal and high pressure, magnesium nitrate and Mg (NO 3 ) 2 , which function as an electrolyte and adhesive, (1,600-1,650 ° C.), a pin hole is formed on the entire surface of the heater as shown in FIGS. 5 to 7, and a leakage current is generated from the heating line F to the cathode 1. This causes a problem of damaging or dropping the quality of the television and monitor such as noise occurring on the screen.
따라서, 본 발명은 상기한 문제점을 해결하기 위하여 안출된 것으로서, 히터의 절연, 보온제인 알루미나 액이 전해질 량에 따라 수분의 건조와 소결시 핀홀의 생성으로 유발되는 누설전류의 발생을 방지할 수 있는 브라운관용 음극 히터의 코팅방법을 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for preventing the occurrence of leakage currents caused by the formation of pinholes during drying and sintering of an alumina liquid, And to provide a coating method of a negative electrode heater for a brown tube.
제1도는 종래 및 본 발명의 실시예에 따른 브라운관용 전자총에서 음극 완성품의 단면도.FIG. 1 is a cross-sectional view of a negative electrode finished product in a prior art and an electron gun for a brown tube according to an embodiment of the present invention; FIG.
제2도는 제1도의 완성 히터의 확대사진.FIG. 2 is an enlarged view of the completed heater of FIG. 1; FIG.
제3도는 제2도의 A부분의 단면도로서, 확대 사진.FIG. 3 is a cross-sectional view of part A of FIG.
제4도는 제2도의 A부 단면(사진) 상세도.FIG. 4 is a detail view of a section A (photograph) of FIG. 2;
제5도 내지 제7도는 종래의 실시예에 따라 제조된 브라운관용 음극히터에서 발생된 핀홀을 보여주는 사진.FIGS. 5 to 7 are photographs showing pinholes generated in a cathode heater for a brown tube manufactured according to a conventional example. FIG.
제8도는 본 발명의 실시예에 따라 제조된 브라운관용 음극히터에서 소결후의 코팅면을 확대한 사진.FIG. 8 is an enlarged photograph of a coating surface after sintering in a cathode heater for a brown tube manufactured according to an embodiment of the present invention; FIG.
제9도는 전해질인 Mg(NO3)2, 6H2O의 첨가량에 따른 핀홀의 발생정도를 관측하여 나타낸 그래프.FIG. 9 is a graph showing the occurrence of pinholes according to the amounts of Mg (NO 3 ) 2 and 6H 2 O as electrolytes.
제10도는 전해질 량과 히터-음극(Heater-Cathode, H-K)간의 누설전류의 상관관계를 도시한 그래프10 is a graph showing the relationship between the amount of electrolyte and the leakage current between the heater-cathode (H-K)
〈도면의 주요부분에 대한 부호의 설명〉Description of the Related Art
1 : 음극 완성품 2 : 발열체1: cathode Finished product 2: heating element
F : 발열선 G : 1차 코팅막F: heating wire G: primary coating film
E : 2차 코팅막(흑체)E: Secondary coating film (black body)
본 발명에 따르면, 코팅면의 조도향상과 강도유지, 완전 절연을 위하여 주전해질 량은 0.9wt%이상, 1.5wt%이하로 제한하고, 부수적인 기능은 접착제(Binder)역할을 하는 질산 마그네슘, Mg(NO3)2를 사용하되 최적의 품질과 생산성을 내는 1.1-1.3wt%로 넣어 코팅하므로써, 원하는 개량된 성능의 히터를 얻는다. 주전해질양이 1.5wt%이상 되면, 핀홀과 요철이 발생되며, 0.9wt%이하가 되면, 전착량이 부족하면서 표면이 거칠고 강도가 약해서 코팅면이 탈락하는 현상이 발생하므로, 전해질의 조성범위는 위와 같이 한정된다.According to the present invention, the main electrolytic amount is limited to not less than 0.9 wt% and not more than 1.5 wt% for enhancing the roughness of the coated surface, maintaining the strength, and ensuring complete insulation. Ancillary functions include magnesium nitrate, magnesium (NO 3 ) 2 , but it is coated with 1.1-1.3wt%, which gives optimum quality and productivity, to obtain the desired improved performance heater. If the amount of main electrolyte is more than 1.5 wt%, pinholes and irregularities are generated. When the amount of main electrolyte is less than 0.9 wt%, the surface is rough and the strength is weak due to lack of electrodeposition, As well.
이하, 첨부한 도면을 참조하여 본 발명의 바람직한 실시예를 설명한다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
히터는 고른 피치로 감긴 텅스텐제 발열선의 주위에 부도체이면서 절연, 보온, 발열선의 고른 피치 그대로의 형성 유지와 강도의 유지를 위해 일정한 분포의 입경을 갖는 알루미나(G)를 전기영동법에 의해 발열선(F)에 맞닿은 곳에 형성한다. 이 때, 형성된 막을 제 1 코팅막이라 한다. 그런다음, 제 1 코팅막의 표면에는 도체(E)를 코팅시키고, 이를 제 2 코팅막이라 한다.The heater is made of alumina (G) having a uniform distribution of particle diameters by means of electrophoresis to form a solid line around the heating line (F ). At this time, the formed film is referred to as a first coating film. Then, the conductor (E) is coated on the surface of the first coating film, which is referred to as a second coating film.
제 2 도와 제 3 도를 참조하면, 히터는 맨드릴선 주위에 발열체인 레늄과 텅스텐을 혼합하는 합금선(F)이 동심원으로 고른 피치로 감겨 있고, 주위 전체면에는 전기 영동법에 의해 코팅제가 전착된 구조를 가진다.Referring to FIGS. 2 and 3, an alloy wire F for mixing rhenium and tungsten, which is a heating element, is wound around the mandrel wire in a concentric circle at a uniform pitch, and a coating agent is electrodeposited on the entire circumference by electrophoresis Structure.
상기와 같은 구조를 갖는 히터를 제조하기 위하여, 먼저, 절연, 보온, 강도 유지제인 알루미나층(G)을 코팅하게 되는데, 이는 순도가 99.99%이상되는 알루미늄 전극판에전위를 띠게 하고, 코팅(G)전(前)에 클립에 히터를 30개씩 집어전위를 띠게한 홀더에 꽂아 액중에 담그어 준다. 이로 인하여 고형분(입자)으로 있는 알루미나는 부도체이므로와전위를 띤 양극(兩極)이 있는 구조라도 전기 영동법에 의해 코팅을 할 수 없어 소기의 목적을 달성할 수가 없으므로 전해질인 Mg(NO3)2, 6H2O를 0.9-1.5wt%만큼 혼합시켜 부도체인 알루미나 입자 주위에 전해질막을 형성케한다. 알루미나 입자에전위를 띠게 해서극인 알루미늄 판에서극인 히터 클립으로 전류를 이동시켜 알루미나로 미세한 절연층을 만들어서 절연, 보온, 강도를 유지하는 역할을 하는 층(G)을 제 2 도와 같이 히터표면에 절연층을 전체 두께의 3/4정도 형성시킨 후, 1차 건조후 그 위에 복사열 증대용 흑체(Dark body, E)층을 형성한 후, 1,600-1.650℃의 고온과 수소분위기에서 소결하여 히터 완성품을 만들게 된다.In order to produce a heater having the above structure, an alumina layer (G), which is an insulating, insulating, and strength-retaining agent, is first coated on an aluminum electrode plate having a purity of 99.99% Potentiostat, put 30 heaters on clip before coating (G) It is inserted into a holder holding potential and immersed in liquid. Because of this, alumina in the form of solid (particles) is an insulator Wow It is impossible to achieve the intended purpose because it can not be coated by the electrophoretic method even though the structure having the positively charged anode is used. Therefore, Mg (NO 3 ) 2 and 6H 2 O are mixed by 0.9-1.5 wt% Thereby forming an electrolyte film around the alumina particles. To alumina particles With a potential From an extreme aluminum plate The layer (G), which serves to maintain insulation, insulation, and strength by forming a fine insulating layer with alumina by moving the current to the heater clip of the extremity, is formed by forming about 3/4 of the total thickness of the insulating layer on the surface of the heater After the primary drying, a dark body (E) layer for increasing radiant heat is formed thereon, and then the heater is finished by sintering in a high temperature and hydrogen atmosphere at 1,600-1,650 ° C.
상기와 같이, 1차 코팅막의 형성시 알루미나 입자의 코팅을 위하여 첨가되는 전해질인 Mg(NO3)2, 6H2O를 1.1-1.3wt%범위로 한정시켜 준 결과, 제 8 도에 도시한 것과 같이, 핀홀의 발생이 없는 히터 완성품을 얻을 수 있었다.As described above, Mg (NO 3 ) 2 and 6H 2 O, which are electrolytes added for the coating of alumina particles in the formation of the primary coating film, were limited to the range of 1.1-1.3 wt%. As a result, Likewise, a heater finished product free of pinholes was obtained.
제 9 도는 전해질인 Mg(NO3)2, 6H2O의 첨가량에 따른 핀홀의 발생정도를 관측하여 나타낸 그래프이고, 제 10 도는 전해질 량과 히터-음극(Heater-Cathode)간의 누설전류와의 상관관계를 도시한 그래프로서, ●표시는 매우 양호한 상태를, △표시는 양호한 상태를, 그리고 ×표시는 불량한 상태, 즉 핀홀의 발생이 관측되거나 누설전류값이 매우 높은 상태를 각각 나타낸다.FIG. 9 is a graph showing the occurrence of pinholes according to the amounts of the electrolytes Mg (NO 3 ) 2 and 6H 2 O, and FIG. 10 is a graph showing the relationship between the amount of electrolyte and the leakage current between the heater- As shown in the graph, the .circle-solid. Indicates a very good state, the .DELTA. Indicates a satisfactory state, and the .circle-solid. Indicates a poor state, that is, a pinhole occurrence is observed or a leakage current value is extremely high.
제 9 도를 참조하면, 핀홀 발생의 경우, Mg(NO3)2, 6H2O의 첨가량이 0.7-1.4wt%의 범위에서도 매우 양호한 상태를 나타내고 있다. 그러나, 제 10 도를 참조하면, 1.1-1.3wt%를 넘어서는 범위는 누설전류가 높은 값을 보이므로, 본 발명의 한정 범위에서는 제외한다.Referring to FIG. 9, in the case of pinhole generation, the addition amount of Mg (NO 3 ) 2 and 6H 2 O shows a very good state even in the range of 0.7-1.4 wt%. Referring to FIG. 10, however, the range exceeding 1.1-1.3 wt% shows a high value of the leakage current, and thus is excluded from the limiting scope of the present invention.
이상에서 설명한 바와 같이, 본 발명의 브라운관용 음극히터 코팅방법은 1차 코팅막의 형성시, 알루미나 분말의 전기영동법에 의한 전착을 위하여 첨가되는 Mg(NO3)2, 6H2O의 첨가량을 소정 범위로 제한하여 주므로써, 핀홀과 요철의 발생을 방지하고, 표면을 부드럽게 하며, 코팅된 막의 강도가 적정값 이상을 갖도록 하므로써, 코팅면이 탈락하는 현상을 방지한다. 또한, 낮은 누설전류값을 갖도록 하므로써, 누설전류로 인한 불량요인들을 저감시키는 효과를 제공한다.As described above, in the cathode coating method for a brown tube of the present invention, when the amount of Mg (NO 3 ) 2 , 6H 2 O added for electrodeposition by alumina powder electrophoresis is set to a predetermined range The occurrence of pinholes and irregularities is prevented, the surface is smoothened, and the strength of the coated film is set to an appropriate value or more, thereby preventing the coating surface from falling off. Further, by providing a low leakage current value, it is possible to reduce the failure factors caused by the leakage current.
여기에서는 본 발명의 특정 실시예에 대해서 설명하고 도시하였지만, 당업자에 의하여 이에 대한 수정과 변형을 할 수 있다. 따라서, 이하, 특허청구의 범위는 본 발명의 진정한 사상과 범위에 속하는 한 모든 수정과 변형을 포함하는 것으로 이해할 수 있다.Although specific embodiments of the invention have been described and illustrated herein, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Therefore, the following claims are to be understood as including all modifications and variations as fall within the true spirit and scope of the present invention.
Claims (6)
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