KR920010358B1 - Cathode structure for electron tube - Google Patents

Cathode structure for electron tube Download PDF

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KR920010358B1
KR920010358B1 KR1019870004369A KR870004369A KR920010358B1 KR 920010358 B1 KR920010358 B1 KR 920010358B1 KR 1019870004369 A KR1019870004369 A KR 1019870004369A KR 870004369 A KR870004369 A KR 870004369A KR 920010358 B1 KR920010358 B1 KR 920010358B1
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South Korea
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cathode
negative electrode
support
electron tube
current
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KR1019870004369A
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Korean (ko)
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KR880014614A (en
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이경상
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주식회사 금성사
구자학
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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

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Abstract

A cathode structural body for cathode ray tube is characterized by bimetal cathode support (12). The bimetal for cathode support (12) consists of nickel-chromium alloy for the inner layer and nickel for the outer layer. The nickel-chromium alloy is blackened by steam moistening. The cathode structural body can minimize the variance of brightness of the CRT screen by minimizing the current change of cathode using the bimetal at an incipient stage.

Description

전자관용 음극구조체Cathode Structure for Electron Tube

제1도는 종래의 음극구조체의 구성을 보인 종단면도.1 is a longitudinal cross-sectional view showing the configuration of a conventional cathode structure.

제2도는 본 발명에 의한 음극구조체의 구성을 보인 종단면도.Figure 2 is a longitudinal cross-sectional view showing the configuration of the cathode structure according to the present invention.

제3도는 본 발명과 종래의 음극전류 변화상태 비교도.Figure 3 is a comparison of the present invention and the conventional cathode current change state.

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

11 : 절연체 12 : 음극지지체11 insulator 12 cathode support

13 : 음극 14 : 히터13: cathode 14: heater

15 : 제1전극15: first electrode

본 발명은 음극지지체를 구비한 전자관용 음극구조체에 관한 것으로, 특히 바이메탈을 이용하여 초기에 음극전류의 변화를 극소화시킴으로써 전자관 스크린상의 화상밝기의 변화를 최소화시킬 수 있도록 한 전자관용 음극구조체에 관한 것이다.The present invention relates to a cathode structure for an electron tube provided with a cathode support, and more particularly, to a cathode structure for an electron tube that minimizes a change in image brightness on an electron tube screen by minimizing a change in cathode current initially using a bimetal. .

종래의 음극구조체는 제1도에 도시한 바와 같이 환상의 절연체(1)로 고정된 음극지지체(2)의 내부에 음극캡, 음극슬리브, 음극홀더로 구성된 음극(3)이 지지되고, 음극(3)의 내부에는 히터(4)가 설치되며, 음극(3)의 선단부측에는 제1전극(5)이 위치하는 구조로 되어 있다.In the conventional negative electrode structure, as shown in FIG. 1, the negative electrode 3 including the negative electrode cap, the negative electrode sleeve, and the negative electrode holder is supported inside the negative electrode support 2 fixed by the annular insulator 1, and the negative electrode ( The heater 4 is provided inside 3), and the first electrode 5 is positioned on the tip end side of the cathode 3.

이와 같은 종래의 음극구조에 있어서 히터(4)의 전원이 『온』으로 되어 전자관의 스크린상의 화상이 출현할 때까지의 시간을 출화시간이라 하는 바, 이 출화시간을 단축시키기 위하여 음극슬리브를 수분이 함유된 수소분위기에서 약 1,000℃로 흑화처리하게 된다.In this conventional cathode structure, the time until the power source of the heater 4 is turned "on" and an image on the screen of the electron tube appears is called firing time. The hydrogenated atmosphere is blackened to about 1,000 ° C.

흑화처리된 음극(3)은 그 선단부에 탄산염으로 구성된 전자방출물질을 도포하게 되며, 음극지지체(2)의 상단부를 금속봉착방법 및 유리봉착방법에 의하여 환상절연체(1)에 고정한 다음 다시 스판세트공정을 거쳐 제1전극(5)과 일정한 간격이 유지되도록 음극지지체(2)의 하단부를 용접하게 된다.The blackened cathode 3 is coated with an electron-emitting material composed of carbonate on its tip. The upper end of the anode support 2 is fixed to the annular insulator 1 by a metal sealing method and a glass sealing method. Through the process, the lower end of the negative electrode support 2 is welded to maintain a constant distance from the first electrode 5.

이러한 종래의 음극지지체(92)는 니켈 또는 니켈-코발트-철 합금을 사용하게 되며, 스판세트공정을 거쳐 전자총에 삽입고정된 음극(3)은 봉지공정을 통하여 전자관에 부착되고, 배기 활성화 공정을 통하여 다음의 반응식과 같이 탄산염이 산화염으로 변화게 되며, 음극캡중의 환원제와 반응하여 자유상태의 바튬을 생성하게 된다.The conventional negative electrode support 92 is made of nickel or nickel-cobalt-iron alloy, and the negative electrode 3 fixed to the electron gun through a spanning process is attached to the electron tube through an encapsulation process, and the exhaust activation process is performed. The carbonate is converted into an oxidized salt as shown in the following reaction formula, and reacts with the reducing agent in the negative electrode cap to generate free lithium.

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이와같이 형성된 자유 바튬은 히터(4)의 열에 의하여 전자를 방출하게 되며, 음극(3)의 기능인 전자방출을 효율적으로 할 수 있게 된다.The free lithium thus formed emits electrons by the heat of the heater 4, and can effectively discharge electrons, which is a function of the cathode 3.

제3도에서 B곡선은 종래의 음극구조체에 있어서 약 15분내의 음극전류의 변화량을 도시한 것으로, 초기에는 전류가 서서히 증가하여 최대음극전류(B1)을 형성시키고, 다시 서서히 감소하여 안정된 음극전류(B2)를 형성시키고 있음을 알 수 있다.The curve B in FIG. 3 shows the amount of change in the cathode current within about 15 minutes in the conventional cathode structure. Initially, the current gradually increases to form the maximum cathode current B 1 , and then gradually decreases to stabilize the cathode. It can be seen that the current B 2 is formed.

여기서 초기상태에서 최대음극전류(B1)를 형성할 때 까지의 시간은 약 30초 정도 소요되며, 초기부터 안정된 음극전류(B2)에 이르는 시간은 약 8분 정도 소용된다.Here, the time from the initial state until the maximum cathode current B 1 is formed is about 30 seconds, and the time from the initial stage to the stable cathode current B 2 is about 8 minutes.

이러한 최대음극전류(B2)와 안정된 음극전류(B2)의 비(比)를 음극전류변환비(B1/B2)라 할 때, 종래의 음극지지체(2)의 음극전류변화비는 약 130%정도로 높게 나타나고 있다.When these La maximum cathode current (B 2) and the ratio (比) a cathode current conversion ratio (B 1 / B 2) of a stable cathode current (B 2), the negative electrode current variation of the conventional cathode support 2 ratio It is about 130% high.

음극전류의 변화는 음극(3)의 주변구조변화에 기인되고 있으며, 음극(3)의 상단부와 제1전극(5)이 가까와지면 음극전류가 증가하게 되고, 멀어지면 음극전류가 감소하게 되는데, 히터(4)를 『온』하게 되면 히터(4)의 열은 음극(3)에 급속히 전도되며, 음극(3)은 상부로 팽창하여 제1전극(5)과의 거리가 가까와지게 된다.The change of the cathode current is caused by the change of the peripheral structure of the cathode 3, and the cathode current increases when the upper end of the cathode 3 and the first electrode 5 are close, and the cathode current decreases when it is far away. When the heater 4 is turned “on”, the heat of the heater 4 is rapidly conducted to the cathode 3, and the cathode 3 expands upwards so that the distance from the first electrode 5 is closer.

또한 음극(3)에 전도된 히터(4)의 열은 다시 음극지지체(2)로 전도되어 음극지지체(2)가 서서히 팽창하게 된다.In addition, the heat of the heater 4 conducted to the cathode 3 is conducted to the cathode support 2 again so that the cathode support 2 gradually expands.

제3도의 B곡선에서 초기상태부터 최대음극전류(B1)까지는 주로 음극(3)이 팽창하여 제1전극(5)과 음극(3)의 상단부가 가까워지는 부분이며, 최대음극전류(B1)로부터 안정된 음극전류(B2)까지는 주로 음극지지체(2)가 팽창하여 제1전극(5)과 음극(3)의 선단부가 멀어지는 부분으로 음극(3)과 음극지지체(3)가 최대로 팽창하여 변화가 일어나지 않으면 음극전류(B2)가 되는 것이다.In the curve B of FIG. 3, the cathode 3 is mainly expanded from the initial state to the maximum cathode current B 1 so that the upper end portions of the first electrode 5 and the cathode 3 are close to each other. ), The cathode support 2 expands mainly from the stable cathode current B 2 to the distal end of the first electrode 5 and the cathode 3, and the cathode 3 and the cathode support 3 expand to the maximum. If no change occurs, the cathode current becomes B 2 .

종래의 음극(3)은 초기상태부터 안정된 음극전류(B2)까지의 시간이 약 8부분으로 상당한 시간이 소요되는데 이는 음극(3)이 상부로 팽창하는 것과 음극지지체(2)가 하부로 팽창하는 것이 시간적으로 중복되는 부분이 적어 음극전류비가 크게 나타나기 때문이다.In the conventional cathode 3, the time from the initial state to the stable cathode current B 2 takes about 8 parts, which is considerable, which means that the cathode 3 expands upward and the cathode support 2 expands downward. This is because the portion of time overlapping is small and the cathode current ratio is large.

따라서 종래의 음극구조체에서는 전자관 스크린상의 밝기가 변화하게 되어 전자관의 특성에 악영향을 주게 되는 문제점이 있었다.Therefore, the conventional cathode structure has a problem that the brightness on the electron tube screen is changed to adversely affect the characteristics of the electron tube.

본 발명의 목적은, 음극의 열이 음극지지체로 신속히 전달되어 음극이 제1전극을 향하여 상부로 팽창되는 도중에 음극지지체가 제1전극의 반대방향을 향하여 하부로 팽창되게 하여 제1전극과 음극 상면부의 간격변화비를 줄임으로써 초기 음극전류의 변화비를 줄여 출화시간을 단축시키고, 전자관 스크린상의 밝기의 변화를 최소화할 수 있도록 한 전자관용 음극구조체를 제공하려는 것이다.An object of the present invention, the heat of the cathode is quickly transferred to the cathode support so that the cathode support expands downwards in the opposite direction of the first electrode while the cathode is inflated upward toward the first electrode to the upper surface of the first electrode and the cathode It is to provide a cathode structure for an electron tube that can reduce the firing time by reducing the change rate of the initial cathode current by reducing the negative gap change ratio and minimize the change of brightness on the electron tube screen.

이하 본 발명에 의한 전자관용 음극구조체를 첨부도면에 도시한 실시예에 따라서 설명한다.Hereinafter, a cathode structure for an electron tube according to the present invention will be described according to the embodiment shown in the accompanying drawings.

제2도는 본 발명의 실시예에 따른 음극구조체의 구성을 보인 종단면도로서, 음극(13)은 종래와 마찬가지로 구성되며, 음극슬리브 역시 수분이 함유된 수소분위기속에서 약 1,000℃로 흑화처리하게 된다.2 is a longitudinal cross-sectional view showing the structure of a negative electrode structure according to an embodiment of the present invention, the negative electrode 13 is configured as in the prior art, the negative electrode sleeve is also blackened to about 1,000 ℃ in the hydrogen atmosphere containing water. .

음극지지체(12)는 니켈-크롬합금과, 니켈로 된 바이메탈을 사용하여 니켈-크롬합금부가 내측에 위치하도록 프레스가공한다.The negative electrode support 12 is press-processed so that a nickel-chromium alloy part may be located inside using nickel-chromium alloy and nickel bimetal.

여기서 니켈-크롬합금은 크롬이 약 18~20Wt% 함유된 함금으로서 흑화처리시에 수증기 가습방법을 이용하여 가습하게 되며 크롬이 산화물로 변하면서 흑화되는 것이다.Here, the nickel-chromium alloy is a chromium-containing alloy containing about 18 to 20 Wt%, which is humidified using a steam humidification method during the blackening treatment, and the blackening of the chromium turns into an oxide.

이때의 흑화처리면은 다음 공정인 음극(13)과 음극지지체(12)의 용접시 영향을 주지 않도록 엷게 처리한다.The blackened surface at this time is lightly treated so as not to affect the welding of the negative electrode 13 and the negative electrode support 12 which are the next steps.

이렇게 내부가 흑화처리된 음극지지체(12)는 환상절연체(11)와 금속봉착방법 또는 유리봉착방법 등에 의하여 절연분리시켜 전자총에 부착되며, 스판스트공정을 통하여 음극(13)은 음극지지체(12)에 용접되어진 다음 음극(13) 상단부와 제1전극(15)과의 간격을 일정하게 유지되도록 하고 있다.The negative electrode support 12 having a blackened interior is separated from the annular insulator 11 by a metal sealing method or a glass sealing method and attached to the electron gun, and the negative electrode 13 is attached to the negative electrode support 12 through a span process. The gap between the upper end of the cathode 13 and the first electrode 15 is maintained to be constant.

이와 같이 음극(13)이 삽입고정된 전자총은 봉지공정을 거쳐 전자관에 부착되며 배기활성화 공정을 거쳐 전자를 방출할 수 있는 음극(13)이 된다.The electron gun in which the cathode 13 is inserted and fixed is attached to the electron tube through an encapsulation process and becomes an anode 13 capable of emitting electrons through an exhaust activation process.

제3도의 A곡선은 본 발명에 의한 음극지지체(12)를 구비한 음국구조체에 대한 음극전류 곡선을 나타내는 것으로, 초기에 서서히 증가하여 최대음극전류(A1)를 형성시키고, 서서히 감소하여 안정된 음극전류(A2)를 형성시키게 된다.Curve A of FIG. 3 shows a cathode current curve for a sound station structure having a cathode support 12 according to the present invention. The curve A gradually increases to form a maximum cathode current A 1 , and gradually decreases to stabilize the cathode. The current A 2 is formed.

이때 초기상태부터 최대음극전류(A1)까지 이르는 시간은 약 15초이고, 초기상태부터 안정된 음극전류(A2)까지 이르는 시간은 약 4분정도로서, 음극전류변화비(A1/A2)는 110%정도로 종래의 130% 보다 낮게 나타나고 있음을 알 수 있다.At this time, the time from the initial state to the maximum cathode current (A 1 ) is about 15 seconds, the time from the initial state to the stable cathode current (A 2 ) is about 4 minutes, the cathode current change ratio (A 1 / A 2 ) It can be seen that 110% is lower than the conventional 130%.

이를 제2도에 의하여 다시 설명하면 다음과 같다.This will be described again with reference to FIG. 2 as follows.

음극전류변화는 음극(13)의 주변 구조변화에 기인되고 있으며, 음극(13)의 상단부와 제1전극(15)의 간격변화에 따라 변하고 있다.The change in the cathode current is caused by the change in the peripheral structure of the cathode 13 and is changing according to the change in the gap between the upper end of the cathode 13 and the first electrode 15.

즉, 음극전류는 제1전극(15)과 음극(13)상단부와의 간격이 가까워지면 증가하게 되고, 멀어지면 감소하게 되며, 히터(14)를 『온』하게 되면 약 2초내에 히터(14)가 약 800℃로 가열되고, 히터(14)의 열은 음극(13)으로 전도된다.That is, the cathode current increases as the distance between the first electrode 15 and the upper portion of the cathode 13 approaches, and decreases when it moves away. When the heater 14 is turned "on", the heater 14 within about 2 seconds. ) Is heated to about 800 ° C., and heat of the heater 14 is conducted to the cathode 13.

음극슬리브는 흑화되어 있으므로 히터(14)의 열을 신속하게 흡수하게 되고, 음극(13)으로부터 빠르게 전자를 방출할 수 있게 하여 출화시간을 단축시키게 된다.Since the negative electrode sleeve is blackened, the heat of the heater 14 is quickly absorbed, and the emission time can be shortened by allowing electrons to be discharged quickly from the negative electrode 13.

이때 음극(13)은 제1전극(15)을 향하여 상부로 팽창하게 되어 제1전극(15)과의 간격이 가깝게 되어 최대전류(A1)을 형성하는데 주된 원인이 된다.In this case, the cathode 13 expands upward toward the first electrode 15, and thus, a distance between the cathode 13 and the first electrode 15 is close, which is a main cause of forming the maximum current A 1 .

또 음극(13)에 전도된 히터(14)의 열은 음극지지체(12)로 전도되는데 음극지지체(12)는 내부가 흑화처리되어 있으므로 열을 빠르게 흡수하게 되고, 제1전극(15)의 반대방향, 즉 하부쪽으로 팽창하게 되어 제1전극(15)과의 간격이 멀어지게 되어 음극전류가 감소하게 되고, 음극(13)과 음극지지체(12)의 팽창이 끝났을 때 안정된 음극전류(A2)를 형성시키게 된다.In addition, the heat of the heater 14 conducted to the cathode 13 is conducted to the cathode support 12. The cathode support 12 absorbs heat quickly because the interior thereof is blackened, and is opposite to the first electrode 15. Direction, i.e., the lower side of the first electrode 15, the distance between the first electrode 15 and the distance away from the cathode current is reduced, the stable cathode current (A 2 ) when the expansion of the cathode 13 and the cathode support 12 is finished. Will form.

여기서 음극지지체(12)의 외부측은 흑화처리되어 있지 않으므로 열을 외부로 방출시키는 것이 적어 음극지지체(12)의 신속한 팽창이 효과적으로 이루어지게 된다.Here, since the outer side of the negative electrode support 12 is not blackened, less heat is released to the outside, so that the rapid expansion of the negative electrode support 12 is effectively performed.

이는 음극(13)의 상부팽창과 음극지지체(12)의 하부팽창이 이루어지는 시간대를 효과적으로 중복시켜 음극전류의 안정화 시간을 단축시케게 되고, 이에 따라 음극전류변화비가 감소된다.This effectively overlaps the time period in which the upper expansion of the negative electrode 13 and the lower expansion of the negative electrode support 12 are shortened, thereby shortening the stabilization time of the negative electrode current, thereby reducing the negative electrode current change ratio.

이상과 같이 본 발명에 의한 음극구조체는 음극지지체를 상호 다른 금속의 이중구조로 형성하고 그 내부의 함급부는 흑화처리를 하는 한편 외부의 비합금부는 흑화처리를 하지 않음으로써 히터의 열을 신속하게 흡수하여 음극의 상부팽창과 음극지지체의 하부팽창이 이루어지는 시간대가 중복되게 하여 음극전류의 안정화시간을 단축시키고, 이에 따라 음극전류변화비를 감소시켜 화면의 안정화를 기할 수 있게 되는 것이다.As described above, the negative electrode structure according to the present invention forms the negative electrode support in a double structure of mutually different metals, and the inner portion of the negative electrode is blackened while the external non-alloyed portion is not blackened. By absorbing the overlap of the time period of the upper expansion of the negative electrode and the lower expansion of the negative electrode support to shorten the stabilization time of the cathode current, thereby reducing the cathode current change ratio to stabilize the screen.

Claims (4)

음극지지체(12)를 구비한 전자관용 음극구조체에 있어서, 상기 음극지지체(12)가 바이메탈로 된 것을 특징으로 하는 전자관용 음극구조체.A cathode structure for an electron tube provided with a cathode support (12), wherein the cathode support (12) is made of bimetal. 제1항에 있어서, 상기 바이메탈이, 내부측은 니켈-크롬합금이고, 외부층은 니켈금속으로 된 것을 특징으로 하는 전자관용 음극구조체.The cathode structure for an electron tube according to claim 1, wherein the bimetal is made of nickel-chromium alloy and the outer layer is made of nickel metal. 제2항에 있어서, 상기 바이메탈의 내부층인 니켈-크롬합금이 흑화처리된 것을 특징으로 하는 전자관용 음극구조체.The cathode structure for an electron tube according to claim 2, wherein the nickel-chromium alloy, which is an inner layer of the bimetal, is blackened. 제3항에 있어서, 상기 흑화처리가 수증기 가습법을 이용하여 처리된 것을 특징으로 하는 전자관용 음극구조체.The cathode structure for an electron tube according to claim 3, wherein the blackening treatment is performed by using a steam humidification method.
KR1019870004369A 1987-05-04 1987-05-04 Cathode structure for electron tube KR920010358B1 (en)

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