JPH0393125A - Linear thermal cathode - Google Patents
Linear thermal cathodeInfo
- Publication number
- JPH0393125A JPH0393125A JP1227971A JP22797189A JPH0393125A JP H0393125 A JPH0393125 A JP H0393125A JP 1227971 A JP1227971 A JP 1227971A JP 22797189 A JP22797189 A JP 22797189A JP H0393125 A JPH0393125 A JP H0393125A
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- emitting material
- electron emitting
- oxide
- barium
- 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
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- HYXGAEYDKFCVMU-UHFFFAOYSA-N scandium oxide Chemical compound O=[Sc]O[Sc]=O HYXGAEYDKFCVMU-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052788 barium Inorganic materials 0.000 claims abstract description 9
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 10
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract description 9
- 239000000758 substrate Substances 0.000 abstract description 8
- 229910052721 tungsten Inorganic materials 0.000 abstract description 8
- 239000010937 tungsten Substances 0.000 abstract description 8
- 238000009825 accumulation Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 239000011229 interlayer Substances 0.000 abstract 2
- 239000010410 layer Substances 0.000 abstract 1
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Inorganic materials [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- 229910052712 strontium Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- 238000004070 electrodeposition Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- 101100275473 Caenorhabditis elegans ctc-3 gene Proteins 0.000 description 1
- 101100168274 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) cox-3 gene Proteins 0.000 description 1
- 150000001341 alkaline earth metal compounds Chemical class 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000009125 cardiac resynchronization therapy Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Solid Thermionic Cathode (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、真空管，ＣＲＴ、蛍光表示管等に使用する
線状熱陰極に関するものである．〔従来の技術〕
線状熱陰極を利用する機器は従来種々提案されており、
例えば平板型表示装置として特開昭６０＝８４７４４号
に開示されている如きものがある．第２図はかかる従来
の平板型表示装置を示す模式的断面図であり、この表示
装置には、絶縁性基板１上に一定の間隔で設けた複数の
金属製係止部２上にかけ渡して、所定の間隔で電子放射
物質を保持させ陰極４を形威した陰極ワイヤー３が設け
られている．各陰極４と対応させ、上記絶縁性基Ｆｉｌ
上に制御電極５を配設すると共に、陰極ワイヤー３の上
方には各陰極４と対応した位置に貫通孔６ａを備えたグ
リッド電極６、及びこのグリンド電極６の上方に上記各
陰極４に対応した位置に蛍光体７を塗布したアノード８
が夫々上，下方向に所要の間隔を隔てて配設されている
．前記電極ワイヤー３はタングステン製であり、また陰
極４は、陰極ワイヤー３の表面に電着法、或いは塗布法
などによりバリウム，ストロンチウム，カルシウムの三
元炭酸塩（ （Ｂａ， Ｓｒ， Ｃａ）Ｃｏｘ ３を付
着させ、表示装置容器内を真空に排気する過程でこれを
加熱分解し、上記炭酸塩を酸化物（ （Ｂａ， Ｓｒ＋
Ｃａ）０ ）に変換してある．なお、この際、上記陰
極ワイヤー３のタングステンが、以下のような反応で電
子放射物質中のＢａＯを還元して過剰Ｈａを生威する．
このＢａは拡散時に陰極表面へ移動し、ＢａＯ中でドナ
ーを形成しエミッションに寄与する．
６ ８ａＯ＋ Ｗ −＋ ＢａＪＯ４＋ ３ Ｂａ次に
動作について説明する．陰極ワイヤー３をその両端に給
電して約７００℃に加熱すると陰極４表面から電子が放
射される．このときグリッド電極６及びアノード８に正
の電圧を印加すれば電子ビームは貫通孔６ａを通して蛍
光体７に導かれ、蛍光体７を励起せしめる．一方制御電
極５に負の電圧を印加すると陰極４周辺の電界が陰極４
ｂに対して負となり、陰極４からの電子放射を停止せし
め得るから、例えば制御電極５に正のパルス電圧を印加
することにより電子ビームの放射を制御できることにな
る．
ところでかかる線状熱陰極は、上記炭酸塩を酸化物に替
える過程、或いは表示装置の初期動作時に蛍光体７、係
止部２等から放出される不純ガスの影響により、初期エ
ミッション電流が低くなり、表示装置の輝度が低くなっ
たり、表示装置の製造排気工程に長時間を要するなどの
問題点があった．先に発明者等は上記のような問題を解
決するものとして、０．２〜２０重量％の希土類金属酸
化物と、酸化バリウムを含んだアルカリ土類金属酸化物
とを含む混合物であって、希土類金属酸化物に対する酸
化バリウムの重量比を０．４〜６０とした電子放射物質
を線状の耐熱性金属表面に保持した線状熱陰極を提案し
多大の戒果を収めた（特願昭６２ − １２２０５３号
）．
（発明が解決しようとする課題）
そして継続してかかる線状熱陰極に関して研究開発を行
っていたところ、上記反応式により生戒するＢａｘＨＯ
ｈは、経時的に耐熱金属及び電子放射物質の界面に蓄積
された両者を隔てることにもなり、その結果遇剰Ｂａの
生戒を妨げる恐れがあり寿命特性を低下させる一つの原
因になることが確認された．
そして一般に表示明るさの向上のためには電子放出量ア
ップをはかるべく動作温度の上昇（例えば８００℃）が
望まれるが、かかる動作温度上昇は上記反応の促進によ
り前記Ｂａ３［１．の生或を増加させ上述の寿命特性の
一層の低下を招くことになっていた。具体的には、７０
０℃で７０００Ｈ寿命のものが８００゜Ｃでは約５００
０Ｈに低下してしまい問題があった．
ここに発明者等はかかる問題に鑑み鋭意検討を重ねた結
果この発明に到達したのである．（課題を解決するため
の手段）
この発明の線状熱陰極は、線状の耐熱性金属上に、少な
くともバリウムを含むアルカリ土類金属酸化物に酸化ス
カンジウムを２０重量％を超え４０重置％の範囲で含有
させた電子放射物質を被着形威したことを特徴とする線
状熱陰極である．（作 用）
この発明においては、タングステン等の金属基体上に形
成された電子放射物質層が、２０重量％を超え４０重量
％の範囲の量の酸化スカンジウムを含有することにより
、基体タングステンと電子放射物質層間の界面に生威す
る上記ＢａＪＯ．などの中間層を分解する作用を示し、
しかも上記動作温度上昇時においても上記ＢａｓＷＯａ
の増加に充分に適応してその分解作用を維持し、その結
果上記中間層の蓄積を抑制して上記寿命特性の低下を回
避するものと推定される．
（実施例）
以下実施例によりこの発明を具体的に説明する．第１図
はこの発明の一実施例による線状熱陰極を用いた表示装
置の要部を示す模式的断面図であり、図中１はガラス板
，セラ逅ツタ板等で構威した絶縁性基板、１は主として
金属製の突起又はリブ等として形威される係止部、３は
タングステン陰極ワイヤー ４は陰極ワイヤー３にその
長手方向に所要の間隔で形威された陰極、５は制御電極
、６はグリッド電極、８はアノードを夫々示している．
上記絶縁性基板１上に一定間隔で複数の係止部２を設け
、この各係止部２にかけ渡す態様で陰極ワイヤー３が、
これに形威した陰極４が相隣する係止部２．２間に位置
するよう張架されている．絶縁性基板１上には前記各陰
極４と対向する位置に制？Ｉ電極５を配設し、また、陽
極ワイヤー３の上方には前記陰極４と対向する位置に貫
通孔６ａを開口したグリッドｉｉＩＩｉ６が、更にその
上には前記陰極４と対向する位置に蛍光体７を付したア
ノード８が夫々上下方向に間隔をおいて配設されている
．
以上のような構戒は、実質的には後記する陰極４中の酸
化スカンジウムの混入量が異ることを除き第２図の従来
品と略同一である．
陰極ワイヤーとしてはタングステンあるいは主戒分が一
ｏ， Ｔａなどである耐熱性金属が用いられる．次に陰
極４としては、少なくとも酸化バリウムを含むバリウム
，ストロンチウム，カルシウムなどアルカリ土類金属化
合物からなり、酸化スカンジウムを２０重量％を超え４
０重量％の範囲で含有させた電子放射物質による電着液
を用いる．具体的には、Ｂａｄ： ６ ４， ＳｒＱ：
３ ２， ＣａＯ：４各重量％のものに酸化スカンジ
ウムを全量に対して３０重量％混入した．
これを従来と同様の電着法により膜厚８ｎで陰極ワイヤ
ー３上に保持させ各陰極を形成した．次にこれを表示装
置の排気過程において加熱し、炭酸塩（Ｂａ， Ｓｒ＋
Ｃａ）ＣＯ３を（ （８ａ， Ｓｒ， Ｃａ）Ｏに変
え組威比の異る陰極を有する表示装置を作或した．比較
のために上記タングステンワイヤー３上に、Ｓｃｚ０２
２ ０重量％を含む陰極を被着したものを同様に作製
した．それら表示装置の高輝度特性維持時間を８ ０
０ ”Ｃにおいて測定したところ、本発明実施例品は約
７０００時間であったのに対し、比較例品は約５０００
＃ｒｊＩであった．即ちこの発明によれば、陰極温度８
００℃の高輝度作動時の寿命特性の向上は従来品に対し
約４割にも達する優れたものであった．
この発明において、前記酸化スカンジウムの量が４０重
量％を超えると、それに相当してフリーのバリウム量が
減少し、結果的に電子放射特性が低下して本来の目的に
適合しなくなり好ましくない．
（発明の効果）
以上説明したようにこの発明の陰極は、表示装置の動作
温度上昇による高輝度化、及び電子管装置などの高性能
化を長期に維持する等長寿命化に優れた効果を奏するも
のである．DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a linear hot cathode used in vacuum tubes, CRTs, fluorescent display tubes, etc. [Prior art] Various devices using linear hot cathodes have been proposed in the past.
For example, there is a flat panel display device as disclosed in Japanese Patent Laid-Open No. 60-84744. FIG. 2 is a schematic cross-sectional view showing such a conventional flat panel display device. , cathode wires 3 holding electron-emitting substances and forming cathodes 4 are provided at predetermined intervals. The insulating group Fil corresponds to each cathode 4.
A control electrode 5 is disposed above the cathode wire 3, and above the cathode wire 3 there is a grid electrode 6 having a through hole 6a at a position corresponding to each cathode 4, and above the grid electrode 6 corresponding to each cathode 4. Anode 8 coated with phosphor 7
are arranged at required intervals in the upper and lower directions, respectively. The electrode wire 3 is made of tungsten, and the cathode 4 is made of ternary carbonate of barium, strontium, and calcium ((Ba, Sr, Ca)Cox 3 by electrodeposition or coating on the surface of the cathode wire 3. is deposited and thermally decomposed in the process of evacuating the inside of the display device container, converting the carbonate into oxides ((Ba, Sr+
It has been converted to Ca)0). At this time, the tungsten of the cathode wire 3 reduces BaO in the electron emitting material and generates excess Ha through the following reaction.
This Ba moves to the cathode surface during diffusion, forms donors in BaO, and contributes to emission. 6 8aO+ W −+ BaJO4+ 3 Ba Next, the operation will be explained. When the cathode wire 3 is heated to approximately 700°C by supplying power to both ends, electrons are emitted from the surface of the cathode 4. At this time, if a positive voltage is applied to the grid electrode 6 and the anode 8, the electron beam is guided to the phosphor 7 through the through hole 6a and excites the phosphor 7. On the other hand, when a negative voltage is applied to the control electrode 5, the electric field around the cathode 4
Since it becomes negative with respect to b and can stop electron emission from the cathode 4, the emission of the electron beam can be controlled by applying a positive pulse voltage to the control electrode 5, for example. However, in such a linear hot cathode, the initial emission current becomes low due to the process of replacing the carbonate with an oxide, or due to the influence of impurity gas released from the phosphor 7, the locking part 2, etc. during the initial operation of the display device. However, there were problems such as the brightness of the display device becoming low and the exhaust process for manufacturing the display device taking a long time. Previously, the inventors proposed a mixture containing 0.2 to 20% by weight of a rare earth metal oxide and an alkaline earth metal oxide containing barium oxide as a solution to the above problems. He proposed a linear hot cathode in which an electron-emitting material with a weight ratio of barium oxide to rare earth metal oxide of 0.4 to 60 was held on the surface of a linear heat-resistant metal, and achieved great results (Special Request 62-122053). (Problem to be Solved by the Invention) As we continued to conduct research and development regarding such linear hot cathodes, we found that BaxHO
h accumulates over time at the interface between the heat-resistant metal and the electron-emitting material, which may separate the two, and as a result, there is a risk that excess Ba may interfere with the lifestyle and become one of the causes of deterioration of life characteristics. was confirmed. Generally, in order to improve display brightness, it is desired to increase the operating temperature (for example, 800°C) in order to increase the amount of electron emission, but such an increase in operating temperature is due to the promotion of the above-mentioned Ba3[1. This results in a further decrease in the above-mentioned life characteristics. Specifically, 70
A product with a lifespan of 7000H at 0°C has a lifespan of about 500H at 800°C.
There was a problem as it dropped to 0H. In view of this problem, the inventors conducted extensive studies and arrived at this invention. (Means for Solving the Problems) The linear hot cathode of the present invention has more than 20% by weight and 40% by weight of scandium oxide superimposed on an alkaline earth metal oxide containing at least barium on a linear heat-resistant metal. This is a linear hot cathode characterized by a deposited form of an electron-emitting substance containing a range of . (Function) In the present invention, the electron emitting material layer formed on the metal substrate such as tungsten contains scandium oxide in an amount exceeding 20% by weight and in the range of 40% by weight, so that the electron emitting material layer forms a bond between the tungsten substrate and the electron emitting material layer. The above-mentioned BaJO. It shows the effect of decomposing the intermediate layer such as
Moreover, even when the operating temperature rises, the BasWOa
It is presumed that the decomposition effect is maintained by fully adapting to the increase in the amount of carbon dioxide, thereby suppressing the accumulation of the intermediate layer and avoiding the deterioration of the life characteristics described above. (Example) The present invention will be specifically explained below using examples. FIG. 1 is a schematic cross-sectional view showing the main parts of a display device using a linear hot cathode according to an embodiment of the present invention. A substrate, 1 is a locking part mainly shaped as a metal protrusion or rib, 3 is a tungsten cathode wire, 4 is a cathode formed on the cathode wire 3 at required intervals in the longitudinal direction, and 5 is a control electrode. , 6 indicates a grid electrode, and 8 indicates an anode. A plurality of locking portions 2 are provided at regular intervals on the insulating substrate 1, and the cathode wire 3 is stretched across each of the locking portions 2.
A cathode 4 shaped like this is stretched so as to be positioned between adjacent locking parts 2.2. On the insulating substrate 1, a capacitor is provided at a position facing each of the cathodes 4. In addition, above the anode wire 3, there is a grid iiiIIIi6 with a through hole 6a opened at a position facing the cathode 4, and above the grid iiiIIIi6, a phosphor is disposed at a position facing the cathode 4. Anodes 8 marked with 7 are arranged at intervals in the vertical direction. The above structure is substantially the same as that of the conventional product shown in FIG. 2, except for the difference in the amount of scandium oxide mixed in the cathode 4, which will be described later. The cathode wire is made of tungsten or a heat-resistant metal whose main component is 10, Ta, etc. Next, the cathode 4 is made of an alkaline earth metal compound such as barium, strontium, calcium, etc. containing at least barium oxide, and contains more than 20% by weight of scandium oxide.
An electrodeposition solution containing an electron-emitting substance in the range of 0% by weight is used. Specifically, Bad: 6 4, SrQ:
3 2, CaO: 4 respectively, and scandium oxide was mixed at 30% by weight based on the total amount. Each cathode was formed by holding this on the cathode wire 3 to a film thickness of 8 nm using the same electrodeposition method as in the past. Next, this is heated in the exhaust process of the display device to form carbonates (Ba, Sr+
By replacing Ca)CO3 with ((8a, Sr, Ca)O, we created a display device having cathodes with different composition ratios.For comparison, we placed Scz02 on the tungsten wire 3 above.
A cathode containing 20% by weight was similarly prepared. The high brightness characteristic maintenance time of these display devices is 80
When measured at 0''C, the product according to the invention was approximately 7,000 hours long, while the comparative example product was approximately 5,000 hours long.
It was #rjI. That is, according to this invention, the cathode temperature is 8
The life characteristics during high-intensity operation at 00°C were improved by about 40% compared to conventional products. In the present invention, if the amount of scandium oxide exceeds 40% by weight, the amount of free barium will decrease correspondingly, resulting in a decrease in electron emission characteristics, which is undesirable as it will not be compatible with the original purpose. (Effects of the Invention) As explained above, the cathode of the present invention has excellent effects in increasing the brightness by increasing the operating temperature of display devices and extending the life of electron tube devices by maintaining high performance for a long period of time. It is something.
第１図は本発明品を用いた表示装置の模式的断面図、第
２図は従来の表示装置を示す模式的断面図である．
１・・・絶縁性基板、２・・・係止部、３・・・陰極ワ
イヤ４・・・陰極、５・・・制御電極、６・・・グリッ
ド電極、７・・・蛍光体、８・・・アノード．
なお、図中、同一符号は同一、又は相当部分を示す．FIG. 1 is a schematic cross-sectional view of a display device using the product of the present invention, and FIG. 2 is a schematic cross-sectional view showing a conventional display device. DESCRIPTION OF SYMBOLS 1... Insulating substrate, 2... Locking part, 3... Cathode wire 4... Cathode, 5... Control electrode, 6... Grid electrode, 7... Phosphor, 8 ···anode. In addition, the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
ルカリ土類金属酸化物に酸化スカンジウムを２０重量％
を超え４０重量％の範囲で含有させた電子放射物質を被
着形成したことを特徴とする線状熱陰極。20% by weight of scandium oxide on an alkaline earth metal oxide containing at least barium on a linear heat-resistant metal
A linear hot cathode characterized in that it is coated with an electron emitting substance containing an electron emitting substance in an amount exceeding 40% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1227971A JPH0393125A (en) | 1989-09-01 | 1989-09-01 | Linear thermal cathode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1227971A JPH0393125A (en) | 1989-09-01 | 1989-09-01 | Linear thermal cathode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0393125A true JPH0393125A (en) | 1991-04-18 |
Family
ID=16869127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1227971A Pending JPH0393125A (en) | 1989-09-01 | 1989-09-01 | Linear thermal cathode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0393125A (en) |
-
1989
- 1989-09-01 JP JP1227971A patent/JPH0393125A/en active Pending
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