JPH0418660B2 - - Google Patents
Info
- Publication number
- JPH0418660B2 JPH0418660B2 JP11260185A JP11260185A JPH0418660B2 JP H0418660 B2 JPH0418660 B2 JP H0418660B2 JP 11260185 A JP11260185 A JP 11260185A JP 11260185 A JP11260185 A JP 11260185A JP H0418660 B2 JPH0418660 B2 JP H0418660B2
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- alkaline earth
- earth metal
- scandium oxide
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 24
- HYXGAEYDKFCVMU-UHFFFAOYSA-N scandium oxide Chemical compound O=[Sc]O[Sc]=O HYXGAEYDKFCVMU-UHFFFAOYSA-N 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 15
- 239000000758 substrate Substances 0.000 claims description 14
- 229910052759 nickel Inorganic materials 0.000 claims description 12
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 11
- -1 alkaline earth metal carbonate Chemical class 0.000 claims description 11
- 230000032683 aging Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 6
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 238000013021 overheating Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 229910052788 barium Inorganic materials 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229910052712 strontium Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000011206 ternary composite Substances 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Classifications
-
- 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
- H01J9/042—Manufacture, activation of the emissive part
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Solid Thermionic Cathode (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、陰極線管等の電子管に使用される
陰極に関し、特に、その電子放射特性の向上を図
つたものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cathode used in an electron tube such as a cathode ray tube, and is particularly directed to improving the electron emission characteristics thereof.
デイスプレイ装置に使用される高解像度陰極線
管や投与形受像機のような大形受像機用の陰極線
管等は、電子ビームの直径を小さくして解像度の
向上を図り、さらに受像機の大形化に伴つて画明
の明るさを上げるためには陰極から取り出す電流
を大きくする必要があり、このため、高電流密度
で使用できる陰極の要求が高まつている。
High-resolution cathode ray tubes used in display devices and cathode ray tubes for large receivers such as dose-type receivers are designed to improve resolution by reducing the diameter of the electron beam, and also to increase the size of the receiver. In order to increase the brightness of the image, it is necessary to increase the current extracted from the cathode, and therefore there is an increasing demand for a cathode that can be used at a high current density.
ところで、従来の陰極は第１図に示すように陰
極スリーブ１に嵌着したSi，Mg等の還元性元素
を微量含むニツケル基体２に、Ba，Sr，Caから
なる複合アルカリ土類金属炭酸塩粉末を、バイン
ダを含む液中に懸濁させた塗布液を、スプレ等の
方法で塗布し、排気過熱工程およびエージング工
程を施して形成した電子放射性物質層３と、ニツ
ケル基体２を介して電子放射物質層３を加熱する
ヒータ４とで構成されている。 By the way, as shown in Fig. 1, a conventional cathode has a nickel substrate 2 fitted in a cathode sleeve 1 containing a trace amount of reducing elements such as Si and Mg, and a composite alkaline earth metal carbonate consisting of Ba, Sr, and Ca. A coating liquid in which powder is suspended in a liquid containing a binder is applied by a method such as spraying, and electrons are transferred through the electron emitting material layer 3 formed by performing an exhaust heating process and an aging process and the nickel substrate 2. It is composed of a heater 4 that heats the radiation material layer 3.
通常、アルカリ土類金属炭酸塩の塗布液は、た
とえばスプレー塗布に最適な粘度およびニツケル
基体２との接着力を均一にするために、代表的に
はニトロセルロースを酢酸ブチル等の有機溶媒に
溶解したバインダと、酢酸ブチルアルコール等の
有機溶媒とをボールミルポツトで調合して約24時
間ボールミルに掛けて懸濁液としたものを使用す
る。 Usually, the alkaline earth metal carbonate coating solution is typically prepared by dissolving nitrocellulose in an organic solvent such as butyl acetate in order to achieve the optimum viscosity for spray coating and uniform adhesion to the nickel substrate 2. The prepared binder and an organic solvent such as butyl acetate are mixed in a ball mill pot, and a suspension is prepared by ball milling for about 24 hours.
ニツケル基体２上に塗布されたアルカリ土類金
属炭酸塩は、真空排気加熱工程に於いてヒータ４
によつて加熱され、Ba，Sr，Caの三元複合酸化
物に変換される。この時の反応式は(1)式によつて
表わされ、この時発生するCO2ガスは排気ポンプ
により管外に排出される。 The alkaline earth metal carbonate coated on the nickel substrate 2 is heated by the heater 4 in the vacuum evacuation heating process.
is heated and converted into a ternary composite oxide of Ba, Sr, and Ca. The reaction equation at this time is expressed by equation (1), and the CO 2 gas generated at this time is exhausted outside the tube by an exhaust pump.
（Ba，Sr，Ca）CO3
→（Ba，Sr，Ca）Ｏ＋CO2 ……(1)
排気加熱工程の完了後、さらにエージング工程
に移り、ニツケル基体２は900〜1100℃の高温に
加熱され、（Ba，Sr，Ca）Ｏからなる三元複合
酸化物は、ニツケル基体２に含有されているSiや
Mgと反応してBa等を遊離生成して電子放射物質
層３が形成される。この反応は(2)式の如くであ
る。 (Ba, Sr, Ca) CO 3 → (Ba, Sr, Ca) O + CO 2 ...(1) After the exhaust heating process is completed, the aging process is further carried out, and the nickel substrate 2 is heated to a high temperature of 900 to 1100°C. , (Ba, Sr, Ca) O is a ternary composite oxide consisting of Si and
The electron emitting material layer 3 is formed by reacting with Mg to liberate Ba and the like. This reaction is shown in equation (2).
BaO＋Mg→Ba＋MgO ……(2)
この反応により、例えば三元複合酸化物のうち
のBaOの一部が還元されて遊離Baが生成し、酸
素欠乏型の半導体となつて700〜800℃の動作温度
に於いて電子放射が活発に行なわれ、陰極線管の
寿命中もこの反応が維持される。 BaO+Mg→Ba+MgO...(2) Through this reaction, for example, a part of BaO in the ternary composite oxide is reduced to generate free Ba, which becomes an oxygen-deficient semiconductor with an operating temperature of 700 to 800℃. Electron emission is active during this process, and this reaction is maintained throughout the life of the cathode ray tube.
しかし、このような方法で製造された従来の陰
極の電子放射物質層３を形成する三元複合酸化物
は半導体構造を形成しているために、高電流を取
り出し時にジユール熱を発生し、三元複合酸化物
の熱的破壊をもたらすという問題点があるため、
使用電流に制限があつた。この発明はこのような
従来の陰極の問題点を解決するためになされたも
ので、高電流を継続して取り出しても寿命中の陰
極電流劣化が少く安定した高電流密度陰極の製造
方法を提供することを目的とする。
However, since the ternary composite oxide forming the electron emitting material layer 3 of the conventional cathode manufactured by such a method has a semiconductor structure, it generates Joule heat when drawing a high current, Due to the problem of thermal destruction of the original composite oxide,
There was a limit to the current that could be used. This invention was made to solve these problems with conventional cathodes, and provides a method for producing a stable high current density cathode with little cathode current deterioration during its life even when high current is continuously drawn. The purpose is to
この発明は、大気雰囲気中で800〜1100℃、30
分〜２時間熱処理した酸化スカンジウム粉末を、
三元アルカリ土類金属炭酸塩粉末に0.1〜20重量
％加えて混合して調製した塗布液を陰極のニツケ
ル基体上に塗布し、排気加熱工程およびエージン
グ工程を施して熱電子放射物質層を形成したもの
である。
This invention can be applied at 800 to 1100℃ and 30℃ in the air atmosphere.
Scandium oxide powder heat-treated for minutes to 2 hours,
A coating solution prepared by adding 0.1 to 20% by weight to ternary alkaline earth metal carbonate powder and mixing is applied onto the nickel substrate of the cathode, and subjected to an exhaust heating process and an aging process to form a thermionic emissive material layer. This is what I did.
電子放射物質層を形成する三元アルカリ土類金
属酸化物中に分散している酸化スカンジウム粉末
は、電子放射物質層の導電性を高めるとともに、
アルカリ土類金属酸化物と反応して生成された複
合酸化物、例えばBa3Sc4O9が陰極の作動中に熱
分解を起して遊離Baを生成し、熱電子の放射を
増大させる作用を作う。
The scandium oxide powder dispersed in the ternary alkaline earth metal oxide that forms the electron emitting material layer increases the conductivity of the electron emitting material layer, and
A complex oxide produced by reacting with an alkaline earth metal oxide, such as Ba 3 Sc 4 O 9 , undergoes thermal decomposition during operation of the cathode to produce free Ba, which increases the emission of thermoelectrons. make
この発明は、電子放射特性に有効とされる種々
の物質について実験した結果、大気雰囲気中で熱
処理した酸化スカンジウム粉末をアルカリ土類金
属炭酸塩に混合した懸濁液を用いて、従来と同じ
方法で陰極のニツケル基体２上に塗布し、その陰
極基体を過熱してアルカリ土類金属炭酸塩を酸化
物に変化させる排気加熱工程、さらに900℃〜
1100℃に過熱してアルカリ土類金属酸化物に酸化
スカンジウムの複合酸化物を形成させるエージン
グ工程を施して製造した陰極が安定した初期電子
放射特性を有し、かつ、電流加速寿命試験に於て
も安定した寿命特性を示すことを発見して完成し
たものである。
As a result of experiments on various substances that are effective for electron emission properties, this invention was developed using the same method as before, using a suspension of scandium oxide powder heat-treated in the atmosphere and mixed with alkaline earth metal carbonate. The cathode is coated on the nickel substrate 2 of the cathode, and the cathode substrate is heated to convert the alkaline earth metal carbonate into an oxide.
The cathode manufactured by heating to 1100°C and undergoing an aging process to form a composite oxide of scandium oxide on alkaline earth metal oxide has stable initial electron emission characteristics, and also has stable initial electron emission characteristics in a current accelerated life test. It was completed after discovering that the same showed stable life characteristics.
以下、この発明の一実施例について説明する。 An embodiment of the present invention will be described below.
酸化スカンジウム粉末を大気雰囲気中で1000℃
で１時間の熱処理を行なう。次にこの酸化スカン
ジウム粉末を、予め調整したアルカリ土類金属炭
酸塩懸濁液に含まれているアルカリ土類金属炭酸
塩に対して１重量％、５重量％および10重量％の
重量比でそれぞれ混合し、ボールミルに掛けて酸
化スカンジウム粉末をよく分散させて塗布液を調
整する。次にこれらの塗布液をそれぞれニツケル
基体２上にスプレ法によつて塗布する。塗布厚さ
はニツケル基体２の直径が２mmの場合、60〜
100μｍが好適である。ついでこの陰極を電子銃
（図示せず）に組み込んで、通常の方法で排気加
熱工程、エージング工程を通し陰極線管を製造し
た。 Scandium oxide powder at 1000℃ in air atmosphere
Heat treatment is performed for 1 hour. Next, this scandium oxide powder was added at a weight ratio of 1% by weight, 5% by weight, and 10% by weight, respectively, with respect to the alkaline earth metal carbonate contained in the alkaline earth metal carbonate suspension prepared in advance. Mix and use a ball mill to thoroughly disperse the scandium oxide powder to prepare a coating solution. Next, each of these coating liquids is applied onto the nickel substrate 2 by a spray method. When the diameter of the nickel substrate 2 is 2 mm, the coating thickness is 60~
100 μm is suitable. This cathode was then assembled into an electron gun (not shown) and subjected to an exhaust heating process and an aging process in a conventional manner to produce a cathode ray tube.
第２図はこの実施例の陰極と、大気雰囲気中で
熱処理しない酸化スカンジウムを混合して製造し
た陰極線管との初期電子放射能力を比較した特性
図で、縦軸に最大陰極電流（以下、MIKという）
を示し、横軸に酸化スカンジウムの混合量を示し
たもので、熱処理しない酸化スカンジウムを混合
した陰極線管の特性Ａは、混合量の増加に伴つて
MIKの値が低くなつているが、大気雰囲気中で
熱処理をしたこの実施例の陰極線管の特性Ｂは、
安定した特性を示している。これは第３図に示す
ように、酸化スカンジウムのガス放出特性が、熱
処理によつて少くなつているためと考えられる。
すなわち、熱処理しない酸化スカンジウムは、特
性Ａに示すように、酸素を含むガス放出が多いた
めに、エージング工程中に放出された酸素ガスが
遊離Baと結合して酸化Baに変化し、遊離状態の
Baが減少するためであると考えられる。 Figure 2 is a characteristic diagram comparing the initial electron emission ability of the cathode of this example and a cathode ray tube manufactured by mixing scandium oxide that is not heat-treated in the atmosphere. )
, and the horizontal axis shows the amount of scandium oxide mixed.Characteristic A of a cathode ray tube mixed with scandium oxide that is not heat-treated changes as the amount of mixture increases.
Although the MIK value is low, the characteristic B of the cathode ray tube of this example heat-treated in an atmospheric atmosphere is as follows.
It shows stable characteristics. This is thought to be because the gas release characteristics of scandium oxide are reduced by heat treatment, as shown in FIG.
In other words, as shown in characteristic A, scandium oxide that is not heat-treated releases a large amount of oxygen-containing gas, so the oxygen gas released during the aging process combines with free Ba and changes to Ba oxide.
This is thought to be due to a decrease in Ba.
第４図は上記実施例の陰極を使用した陰極線管
と、従来の陰極を使用した陰極線管の電子放射能
力の加速寿命試験結果を示す特性を示す図で、図
中、縦軸はMIKの初期化、横軸は寿命試験時間
である。寿命試験条件は通常の５倍の電流加速寿
命試験で、従来の陰極を用いた陰極線管の特性Ａ
に対し、この実施例の陰極を用いた陰極線管の特
性Ｂは、非常に安定している。 Figure 4 is a graph showing the characteristics of the accelerated life test results of the electron emission ability of a cathode ray tube using the cathode of the above embodiment and a cathode ray tube using a conventional cathode. The horizontal axis is the life test time. The life test conditions were a current accelerated life test that was 5 times the normal current, and the characteristics of a cathode ray tube using a conventional cathode were A.
On the other hand, the characteristic B of the cathode ray tube using the cathode of this example is very stable.
熱処理を施した酸化スカンジウム粉末の混合量
を、0.1重量％より少なくすると、実用上効果が
認められず、また20重量％より多くすると、初期
特性の低下が著しくなつて実用的でない。 If the amount of heat-treated scandium oxide powder mixed is less than 0.1% by weight, no practical effect will be observed, and if it is more than 20% by weight, the initial properties will deteriorate significantly, making it impractical.
上記実施例では、酸化スカンジウム粉末の熱処
理を、大気雰囲気中で1000℃、１時間とした例を
説明したが、酸素ガスを含む酸化雰囲気中で、加
熱温度は800〜1100℃、加熱時間は30分間以上で
効果が認められ、２時間以上ではほとんど効果上
の相違は認められなかつた。 In the above example, the scandium oxide powder was heat-treated at 1000°C for 1 hour in an air atmosphere, but the heating temperature was 800-1100°C and the heating time was 30°C in an oxidizing atmosphere containing oxygen gas. The effect was observed for more than a minute, and almost no difference in effectiveness was observed for more than 2 hours.
また、上記実施例では、まえもつて調合したア
ルカリ土類金属炭酸塩懸濁液に、熱処理した酸化
スカンジウム粉末を混合して塗布液を調整する例
を説明したが、アルカリ土類金属炭酸塩と、バイ
ンダと、有機溶媒を調合する工程で熱処理を施し
た酸化スカンジウム粉末を加えた後、ボールミル
に掛けて混合して、塗布液を調整しても同様の効
果が得られる。 In addition, in the above example, an example was explained in which a coating liquid was prepared by mixing heat-treated scandium oxide powder into a previously prepared alkaline earth metal carbonate suspension. The same effect can be obtained by adjusting the coating liquid by adding heat-treated scandium oxide powder to the binder and the organic solvent in the step of preparing the mixture, and then mixing the mixture in a ball mill.
さらに上記実施例では、陰極線管に用いた例に
ついて説明したが、撮像管、送信管、放電管等に
適用して同様の効果が得られる。 Further, in the above embodiments, an example in which the present invention is used in a cathode ray tube has been described, but similar effects can be obtained by applying the present invention to an image pickup tube, a transmitting tube, a discharge tube, etc.
以上のようにこの発明は、酸素ガスを含む酸化
雰囲気中において、800〜1100℃、30分間以上熱
処理を施した酸化スカンジウム粉末を、アルカリ
土類炭酸塩に0.1〜20重量％混合して調整した塗
布液を陰極のニツケル基体上に塗布し、排気加熱
工程とエージング工程とを施して熱電子放射物質
層を形成する陰極の製造方法であつて、この方法
によれば、高電流密度で使用できる陰極が得られ
る。
As described above, this invention is prepared by mixing 0.1 to 20% by weight of scandium oxide powder, which has been heat-treated at 800 to 1100°C for 30 minutes or more in an oxidizing atmosphere containing oxygen gas, to an alkaline earth carbonate. A method for producing a cathode in which a coating solution is applied onto a nickel substrate of the cathode, and a thermionic emissive material layer is formed by performing an exhaust heating step and an aging step, and according to this method, it can be used at a high current density. A cathode is obtained.
第１図は陰極線管用陰極の縦断面図、第２図は
この発明の実施例の陰極を使用した陰極線管と、
熱処理していない酸化スカンジウム粉末を用いた
陰極を使用した陰極線管との初期電子放射能力を
比較した特性図、第３図は熱処理した酸化スカン
ジウムと、熱処理していない酸化スカンジウムの
ガス放出特性図、第４図は上記実施例の陰極を使
用した陰極線管と、従来の陰極を使用した陰極線
管の電流加速寿命試験特性図である。
１……陰極スリーブ、２……ニツケル基体、３
……電子放射物質層。
FIG. 1 is a longitudinal sectional view of a cathode for a cathode ray tube, and FIG. 2 is a cathode ray tube using a cathode according to an embodiment of the present invention.
A characteristic diagram comparing the initial electron emission capacity with a cathode ray tube using a cathode using scandium oxide powder that has not been heat-treated. Figure 3 is a gas release characteristic diagram of heat-treated scandium oxide and scandium oxide that has not been heat-treated. FIG. 4 is a current accelerated life test characteristic diagram of a cathode ray tube using the cathode of the above embodiment and a cathode ray tube using a conventional cathode. 1... Cathode sleeve, 2... Nickel substrate, 3
...Electron-emitting material layer.
Claims (1)
処理を施した酸化スカンジウムをアルカリ土類金
属炭酸塩粉末に対して、0.1〜20重量パーセント
の割合で混合した懸濁液を調整し、この懸濁液を
微量の還元性元素を含むニツケルを主体とする陰
極基体上に塗布して薄層を形成し、電子管の製造
工程において、前記陰極基体を過熱してアルカリ
土類金属炭酸塩を酸化物に変化させる排気過熱工
程と、さらに900℃〜1100℃に過熱してアルカリ
土類金属酸化物と酸化スカンジウムの複合酸化物
を形成させるエージング工程とを施すことを特徴
とする電子管陰極の製造方法。1 Prepare a suspension by mixing scandium oxide, which has been heat-treated for 30 minutes or more in an oxidizing atmosphere at 800℃ to 1100℃, to alkaline earth metal carbonate powder at a ratio of 0.1 to 20% by weight. The suspension is applied onto a cathode substrate mainly made of nickel containing a trace amount of reducing elements to form a thin layer, and during the electron tube manufacturing process, the cathode substrate is heated to oxidize the alkaline earth metal carbonate. A method for manufacturing an electron tube cathode, which comprises performing an exhaust overheating step in which the exhaust gas is converted into a substance, and an aging step in which the exhaust gas is further heated to 900°C to 1100°C to form a composite oxide of an alkaline earth metal oxide and scandium oxide. .
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60112601A JPS61269828A (en) | 1985-05-25 | 1985-05-25 | Manufacture of electron tube cathode |
| KR1019860003666A KR900007751B1 (en) | 1985-05-25 | 1986-05-12 | Electron tube cathode and method of the same |
| US06/864,566 US4864187A (en) | 1985-05-25 | 1986-05-16 | Cathode for electron tube and manufacturing method thereof |
| DE8686303959T DE3660878D1 (en) | 1985-05-25 | 1986-05-23 | Cathode for electron tube and manufacturing method thereof |
| EP86303959A EP0204477B1 (en) | 1985-05-25 | 1986-05-23 | Cathode for electron tube and manufacturing method thereof |
| US07/377,516 US5015497A (en) | 1985-05-25 | 1989-07-10 | Cathode for electron tube and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60112601A JPS61269828A (en) | 1985-05-25 | 1985-05-25 | Manufacture of electron tube cathode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61269828A JPS61269828A (en) | 1986-11-29 |
| JPH0418660B2 true JPH0418660B2 (en) | 1992-03-27 |
Family
ID=14590813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60112601A Granted JPS61269828A (en) | 1985-05-25 | 1985-05-25 | Manufacture of electron tube cathode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61269828A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR910002969B1 (en) * | 1987-06-12 | 1991-05-11 | 미쓰비시전기주식회사 | Electron tube cathode |
| JPS63313446A (en) * | 1987-06-15 | 1988-12-21 | Mitsubishi Electric Corp | Electron tube cathode |
| JPS63313447A (en) * | 1987-06-15 | 1988-12-21 | Mitsubishi Electric Corp | Electron tube cathode |
| JPH0690907B2 (en) * | 1988-02-02 | 1994-11-14 | 三菱電機株式会社 | Electron tube cathode |
| KR19990033174A (en) | 1997-10-23 | 1999-05-15 | 손욱 | Cathode for electron tube |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5778759A (en) * | 1980-11-05 | 1982-05-17 | Mitsubishi Electric Corp | Metal halide lamp |
| JPS57202621A (en) * | 1981-06-09 | 1982-12-11 | Mitsubishi Electric Corp | Manufacturing method for electron emission substance |
-
1985
- 1985-05-25 JP JP60112601A patent/JPS61269828A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5778759A (en) * | 1980-11-05 | 1982-05-17 | Mitsubishi Electric Corp | Metal halide lamp |
| JPS57202621A (en) * | 1981-06-09 | 1982-12-11 | Mitsubishi Electric Corp | Manufacturing method for electron emission substance |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61269828A (en) | 1986-11-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |