JPS63254635A - Cathode for electron tube - Google Patents
Cathode for electron tubeInfo
- Publication number
- JPS63254635A JPS63254635A JP62089559A JP8955987A JPS63254635A JP S63254635 A JPS63254635 A JP S63254635A JP 62089559 A JP62089559 A JP 62089559A JP 8955987 A JP8955987 A JP 8955987A JP S63254635 A JPS63254635 A JP S63254635A
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- indium
- oxide layer
- oxide
- coated
- 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.)
- Pending
Links
- 239000000758 substrate Substances 0.000 claims abstract description 12
- 229910052738 indium Inorganic materials 0.000 claims abstract description 5
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 abstract description 11
- 229910003437 indium oxide Inorganic materials 0.000 abstract description 9
- AMNSWIGOPDBSIE-UHFFFAOYSA-H indium(3+);tricarbonate Chemical compound [In+3].[In+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O AMNSWIGOPDBSIE-UHFFFAOYSA-H 0.000 abstract description 8
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract description 5
- 150000002472 indium compounds Chemical class 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 20
- 239000000047 product Substances 0.000 description 9
- 229910052712 strontium Inorganic materials 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- -1 alkali metal salt Chemical class 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- MLFHJEHSLIIPHL-UHFFFAOYSA-N isoamyl acetate Chemical compound CC(C)CCOC(C)=O MLFHJEHSLIIPHL-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- BLBNEWYCYZMDEK-UHFFFAOYSA-N $l^{1}-indiganyloxyindium Chemical compound [In]O[In] BLBNEWYCYZMDEK-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- IGUXCTSQIGAGSV-UHFFFAOYSA-K indium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[In+3] IGUXCTSQIGAGSV-UHFFFAOYSA-K 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 229940117955 isoamyl acetate Drugs 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、受像管、撮像管等に用いられる電子管用陰極
、特に酸化物被覆型陰極に係わる。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cathode for an electron tube used in a picture tube, an image pickup tube, etc., and particularly to an oxide-coated cathode.
本発明は、金属基体上にアルカリ土類金属酸化物層が被
覆される酸化物被覆型の電子管用陰極において、そのア
ルカリ土類金属酸化物層中にインジウムを含む化合物を
添加することによって高電流密度、長寿命化をはかる。The present invention provides an oxide-coated electron tube cathode in which an alkaline earth metal oxide layer is coated on a metal substrate, and a high current can be achieved by adding an indium-containing compound to the alkaline earth metal oxide layer. Aiming for density and long life.
従来一般の酸化物被覆型陰極は、Ｎｉを主成分とし還元
剤のＷを数％含む金属基体上に、Ｂａ、 Ｓｒ＋Ｃａか
ら成る３元アルカリ土類金屈酸化物層が被覆されて成る
。A conventional general oxide-coated cathode consists of a metal substrate mainly composed of Ni and containing several percent of W as a reducing agent, and coated with a ternary alkaline earth metal oxide layer consisting of Ba, Sr+Ca.
この種の陰極における寿命を決定する１要因は、その金
属基体とこれの上に被覆された酸化物層との間の界面に
、中間層生成物が生じることである。One factor determining the lifetime in this type of cathode is the formation of interlayer products at the interface between the metal substrate and the oxide layer coated thereon.
この中間層生成物は、
６ ＢａＯ＋Ｗ−”３ Ｂａ＋ＢａＡｆＯｓ ・
・・・（１１の反応に因るものであり、この中間層生成
物Ｂａ３υ０６は、高電気抵抗を示すものであるために
、この中間層の増加に伴い、この陰極から引き出す電流
が減少し、更に還元剤の酸化物層への供給が断たれ陰極
としての機能を失い寿命が失くなる。この寿命喪失を来
す中間層生成物の厚さは、他の寿命喪失の要因が支配的
でない場合には、約６０００人である。This intermediate layer product is 6 BaO+W−”3 Ba+BaAfOs.
...(This is due to the reaction in step 11, and since this intermediate layer product Ba3υ06 exhibits high electrical resistance, as the intermediate layer increases, the current drawn from the cathode decreases, Furthermore, the supply of the reducing agent to the oxide layer is cut off, and it loses its function as a cathode, resulting in a loss of life.The thickness of the intermediate layer product that causes this loss of life is not dominated by other factors that cause loss of life. In this case, there are approximately 6,000 people.
本発明が解決しようとする問題点は、電子管用陰極、特
に酸化物被覆型陰極における前述した中間層生成物の発
生に基づく電流密度の低下、寿命の低下の問題である。The problem to be solved by the present invention is that of a decrease in current density and a decrease in life due to the generation of the above-mentioned intermediate layer products in cathodes for electron tubes, particularly oxide-coated cathodes.
本発明は、第１図に示すようにニッケルを主成分とし、
還元剤の例えばＷを数％含む金属基体（１）上に、酸化
インジウム、炭酸インジウム等のインジウムＩｎを含む
化合物が添加された、アルカリ土類金属酸化物例えばＢ
ａ、 Ｓｒ、 Ｃａの３元アルカリ土類金属酸化物ｉｉ
（２１を被覆する。As shown in FIG. 1, the present invention has nickel as a main component,
An alkaline earth metal oxide, such as B, in which a compound containing indium In, such as indium oxide or indium carbonate, is added to a metal substrate (1) containing several percent of a reducing agent, such as W.
a, Sr, Ca ternary alkaline earth metal oxide ii
(Coating 21.
このインジウム化合物の添加量は、例えば０．１〜２０
重量％、好ましくは２〜１０重量％に設定する。The amount of this indium compound added is, for example, 0.1 to 20
It is set to % by weight, preferably 2 to 10% by weight.
上述のインジウム化合物を含むアルカリ土類金泥酸化物
被覆による陰極は、その金属基体とこれの上に被覆され
たアルカリ土類金属酸化物Ｎ（２１との間の高抵抗中間
生成物の発生が効果的に抑制され、高電流密度化と長寿
命化がはかられた。尚、このインジウム化合物の添加に
よって中間層生成物の発生が抑制されるメカニズムはま
だ明らかになっていないところであるが、この生成物の
抑制に伴って前記ｆ１）式によってＢａの発生も抑制さ
れ電子放出効率が低下すると考えられるが、実際上は、
高電流密度を高寿命をもって得られた。The cathode coated with an alkaline earth gold mud oxide containing the above-mentioned indium compound is effective due to the generation of a high-resistance intermediate product between the metal base and the alkaline earth metal oxide N (21) coated thereon. The generation of intermediate layer products is suppressed by the addition of this indium compound, but the mechanism by which the generation of intermediate layer products is suppressed is not yet clear. It is thought that along with the suppression of the product, the generation of Ba is also suppressed by the formula f1) and the electron emission efficiency decreases, but in reality,
High current density and long lifetime were obtained.
尚、ここにＩｎの添加量は、これが余り少ないと中間層
生成物の発生を抑制する効果が生じないものであり、余
り多くなるとアルカリ金属塩の全量が少なくなり過ぎて
電子放出効率を低下させるに至ることからＩｎ添加量は
０．１〜２０重量％、好ましくは２〜１０重量％とする
ことが望まれる。Note that if the amount of In added is too small, the effect of suppressing the generation of intermediate layer products will not be produced, and if it is too large, the total amount of the alkali metal salt will become too small, reducing the electron emission efficiency. Therefore, it is desirable that the amount of In added be 0.1 to 20% by weight, preferably 2 to 10% by weight.
第１図は本発明による陰極を用いた電子管の電子銃の要
部の断面図を示し、Ｋは陰極、Ｇ１及びＧ２は第１及び
第２グリツドでｈｌ及びｈ２は第１及び第２グリツドの
端面板に穿設された電子ビーム透過孔を示す。（３）は
陰極スリーブで、これの端部に、Ｎｔを主体として例え
ばＷを数％含むキャップ状の金属基体（１）が被覆され
て成る。このキャップ状の金属基体（１）の頂面にはア
ルカリ土類金属７４０℃に加熱するようになされている
。FIG. 1 shows a sectional view of a main part of an electron gun of an electron tube using a cathode according to the present invention, K is a cathode, G1 and G2 are first and second grids, and hl and h2 are the first and second grids. The electron beam transmission hole drilled in the end plate is shown. (3) is a cathode sleeve, the end of which is coated with a cap-shaped metal base (1) mainly composed of Nt and containing, for example, a few percent of W. The top surface of this cap-shaped metal base (1) is designed to be heated to 740° C. with an alkaline earth metal.
実施例Ｉ
Ｂａ、 Ｓｒ、 Ｃａ共晶炭酸塩に、バインダーとして
ニトロセルロースと有機溶剤の酸化エチル及び酢酸イソ
アミル、更に炭酸インジウムとを混合してローリングを
行って陰極材ペーストを得る。このペーストをＮｉ−４
重量％と微量のＭｇからなる金属基体（１１上に、その
塗布厚が約１００μｍで密度が０．８ｇ／ａＪとなるよ
うに吹き付は法によって塗布する。このようにして得た
陰極Ｋによって電子銃を構成し、電子管（陰極線管）管
体内に配置し、管体内を排気し封止する。この場合、そ
の排気中の１０００℃〜１１００℃の熱活性によってＢ
ａ＋ Ｓｒ、 Ｃａ炭酸塩と炭酸インジウムとを熱分解
させてＢａ、 Ｓｒ、 Ｃａ酸化物とインジウム酸化物
を生成させる。この場合、出発材料の炭酸インジウムの
混入量は酸化インジウムＩｎ２Ｏ３で５重量％に相当す
る量に選定する。このようにして得た陰極を用いた電子
管すなわち陰極線管についてカソードローディング０．
５Ａ／ｃｄで寿命試験を行ったところＩｎ添加を行わな
かった従来構造のものの寿命が１３０００時間程度であ
るに比し、本発明の実施例１のものは２１０００時間の
寿命となった。第２図はこれら寿命試験の結果を示すも
ので、この場合、第１グリツドＧ１の電子ビーム透過孔
ｈ１の径φ１を０．５１とし、ドライブ率６０％、カッ
トオフ電圧ＥＫｃｏが６５Ｖに選定した電子銃構成とし
てカソード電流Ｉｋを測定したもので、同図中実線曲線
は、本発明による陰極を用いた場合、破線曲線はＩｎ添
加がなされていない場合であり、Ｉｈ＝３００μ八に低
下した時点を寿命とみなしたものである。Example I Ba, Sr, Ca eutectic carbonate is mixed with nitrocellulose as a binder, organic solvents ethyl oxide and isoamyl acetate, and further indium carbonate and rolled to obtain a cathode material paste. Apply this paste to Ni-4
% by weight and a trace amount of Mg is sprayed onto a metal substrate (11) so that the coating thickness is about 100 μm and the density is 0.8 g/aJ. An electron gun is constructed, placed inside an electron tube (cathode ray tube), and the inside of the tube is evacuated and sealed.In this case, the B
a+ Sr, Ca carbonate and indium carbonate are thermally decomposed to produce Ba, Sr, Ca oxides and indium oxide. In this case, the amount of indium carbonate as a starting material is selected to be an amount corresponding to 5% by weight of indium oxide In2O3. An electron tube, ie, a cathode ray tube, using the cathode thus obtained has a cathode loading of 0.
When a life test was conducted at 5 A/cd, the life of the conventional structure without addition of In was about 13,000 hours, while the life of Example 1 of the present invention was 21,000 hours. Figure 2 shows the results of these life tests. In this case, the diameter φ1 of the electron beam transmission hole h1 of the first grid G1 was set to 0.51, the drive ratio was set to 60%, and the cutoff voltage EKco was selected to be 65V. The cathode current Ik was measured using the electron gun configuration. In the figure, the solid line curve is when the cathode according to the present invention is used, and the broken line curve is when In is not added, and the time when Ih decreased to 300 μ8. is regarded as the lifespan.
そして、このように寿命を失った時点においてこれら各
陰極についてＸ線分析により中間層生成量を測定したと
ころＩｎ添加を行わなかったものについては厚さ６００
０人程度０中間層が生成されているに比し、本発明の例
では中間層の生成が殆どみられなかった。When the amount of intermediate layer formed was measured by X-ray analysis for each of these cathodes at the time of the end of its life, the thickness of the cathode without In addition was 600.
In contrast to the generation of about 0 middle classes, almost no middle class was created in the example of the present invention.
尚、上述の実施例１において、Ｉｎの添加を酸化インジ
ウムの状態で混合したものであるが、この場合、
Ｉｎ２（ＣＯ３）３→Ｉｎ２Ｏ３＋３Ｃ０２・・・・（
２）なる反応によって最終的に酸化インジウムＩｎ２Ｏ
：＋が陰極酸化物層中に生成される。In the above-mentioned Example 1, In was added in the form of indium oxide, but in this case, In2(CO3)3→In2O3+3C02...(
2) Indium oxide In2O is finally formed by the reaction
:+ is generated in the cathode oxide layer.
実施例２
実施例１と同様の方法によってＩｎ添加の陰極酸化物層
を得るものであるが、Ｉｎ添加の出発材料として炭酸イ
ンジウムに換えて酸化インジウムを用いた。この場合に
おいても大電流での長寿命化がはかられた。Example 2 An In-added cathode oxide layer was obtained by the same method as in Example 1, but indium oxide was used instead of indium carbonate as the starting material for In addition. In this case as well, a long life at high currents was achieved.
尚、Ｉｎの添加方法としては、酸化インジウム、水酸化
インジウム、或いは有機インジウム等を出発材料として
陰極材ペースト中に混合させることが考えられるが、粒
子の分散性、アルカリ土類金属炭酸塩の分解活性を阻害
しないなどの条件から実施例１におけるように炭酸イン
ジウムの状態で混合することが望ましい。In addition, as a method of adding In, it is possible to mix indium oxide, indium hydroxide, or organic indium as a starting material into the cathode material paste, but this may be due to the dispersibility of the particles and the decomposition of the alkaline earth metal carbonate. It is desirable to mix in the form of indium carbonate as in Example 1 from the viewpoint of not inhibiting the activity.
また、上述の例では、電子管すなわち陰極線管に組込ん
で管体内の排気中で陰極塗膜中の各化合物の熱分解、活
性化を行うようにした場合であるが、成る場合はこの加
熱を排気作業工程中の熱処理とは別工程で行うこともで
きる。In addition, in the above example, each compound in the cathode coating film is thermally decomposed and activated in the exhaust gas inside the tube when it is incorporated into an electron tube, that is, a cathode ray tube. It can also be carried out in a separate process from the heat treatment during the exhaust process.
上述したように、本発明においては、陰極を構成するア
ルカリ土類金属酸化物層（２）中にＩｎを添加したこと
により、この酸化物層（２）と金属基体（１）との界面
における中間層の生成を効果的に回避でき、大電流、長
寿命化をはかることができたものであり、その実用上の
利益は極めて大きい。As described above, in the present invention, by adding In to the alkaline earth metal oxide layer (2) constituting the cathode, at the interface between this oxide layer (2) and the metal substrate (1), It is possible to effectively avoid the formation of an intermediate layer, and it is possible to achieve a large current and a long life, and its practical benefits are extremely large.
第１図は本発明による陰極を用いた電子銃の一例の要部
の断面図、第２図は陰極の寿命試験の測定曲線である。
Ｋは陰極、（１）はその金属基体、（２）はアルカリ土
類金属酸化物層である。
第１図
第２図
手続補正書
昭和６２年 ５月１２日
特許庁長官 黒 １）明 雄 殿
１、ゎイ、。□ 塙
昭和６２年 特 許 願 第 ８９５５９号３、補正を
する者
事件との関係 特許出願人
住 所 東京部品用図化品用６丁目７番３５号名称（２
１８）ソニー株式会社
代表取締役 大 賀 典 雄
４、代理人
６、補正により増加する発明の数
（１） 明細書中、第５頁８行「有機溶剤の酸化エチ
ル」を「有機溶剤の酢酸エチル」と訂正する。
（２）同、同頁１１行「重量％と微量の」を「Ｍ量％Ｗ
と微量の」と訂正する。
（３）同、第７頁２〜３行「酸化インジウムの」を「炭
酸インジウムの」と訂正する。
以上FIG. 1 is a sectional view of a main part of an example of an electron gun using a cathode according to the present invention, and FIG. 2 is a measurement curve of a life test of the cathode. K is the cathode, (1) is its metal substrate, and (2) is the alkaline earth metal oxide layer. Figure 1 Figure 2 Procedural amendment May 12, 1986 Commissioner of the Patent Office Kuro 1) Akio Tono 1, Wow. □ Hanawa 1986 Patent Application No. 89559 3, Relationship with the case of the person making the amendment Patent applicant address Tokyo 6-7-35 for illustrated parts for parts Name (2)
18) Norio Ohga, Representative Director of Sony Corporation (4), Attorney (6), Number of inventions increased due to amendment (1) In the specification, page 5, line 8, "Ethyl oxide, an organic solvent" was changed to "Ethyl acetate, an organic solvent." ” he corrected. (2) Same, same page, line 11, “% by weight and trace amount” is changed to “% by weight
"And a very small amount," he corrected. (3) Same, page 7, lines 2-3, "of indium oxide" is corrected to "of indium carbonate."that's all
Claims (1)
を添加して成る酸化物層が被覆されて成ることを特徴と
する電子管用陰極。[Claims] An electron tube characterized in that a metal substrate containing nickel as a main component is coated with an oxide layer formed by adding a compound containing indium to an alkaline earth metal oxide. cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62089559A JPS63254635A (en) | 1987-04-10 | 1987-04-10 | Cathode for electron tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62089559A JPS63254635A (en) | 1987-04-10 | 1987-04-10 | Cathode for electron tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63254635A true JPS63254635A (en) | 1988-10-21 |
Family
ID=13974177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62089559A Pending JPS63254635A (en) | 1987-04-10 | 1987-04-10 | Cathode for electron tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63254635A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5121027A (en) * | 1990-08-18 | 1992-06-09 | Samsung Electron Devices Co., Ltd. | Oxide-coated cathode for CRT and manufacturing method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4912758A (en) * | 1972-05-12 | 1974-02-04 |
-
1987
- 1987-04-10 JP JP62089559A patent/JPS63254635A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4912758A (en) * | 1972-05-12 | 1974-02-04 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5121027A (en) * | 1990-08-18 | 1992-06-09 | Samsung Electron Devices Co., Ltd. | Oxide-coated cathode for CRT and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS63254635A (en) | Cathode for electron tube | |
| US4260665A (en) | Electron tube cathode and method for producing the same | |
| JPH0719530B2 (en) | Cathode ray tube | |
| JPH08124476A (en) | Cathode for electron tube | |
| JP2928155B2 (en) | Cathode for electron tube | |
| US2585534A (en) | Secondary electron emissive electrode and its method of making | |
| US2190695A (en) | Secondary electron emitter and method of making it | |
| US2428289A (en) | Electron tube coating | |
| US2639963A (en) | Secondary emitter and method of manufacture | |
| US2792273A (en) | Oxide coated nickel cathode and method of activation | |
| JPH0418660B2 (en) | ||
| JPH0318287B2 (en) | ||
| JP2619106B2 (en) | Oxide cathode | |
| JPH07201271A (en) | Electron tube | |
| JPS62198029A (en) | Electron tube cathode | |
| JPH04220924A (en) | Cathode for electron tube | |
| JPH02201841A (en) | Oxide coated hot-cathode | |
| JP2007031563A (en) | Fluorescent substance for low-speed electron beam | |
| JP2937145B2 (en) | Cathode for electron tube | |
| JP2897938B2 (en) | Cathode for electron tube | |
| JPH0275128A (en) | Electron tube cathode | |
| DE886341C (en) | Electron Emitting Electrode | |
| JPS61198529A (en) | Cathode for electron tube | |
| JPS61208719A (en) | Cathode for electron tube | |
| JPH04220925A (en) | Cathode for electron tube |