JPH0355735A - Linear for cathode - Google Patents
Linear for cathodeInfo
- Publication number
- JPH0355735A JPH0355735A JP1191972A JP19197289A JPH0355735A JP H0355735 A JPH0355735 A JP H0355735A JP 1191972 A JP1191972 A JP 1191972A JP 19197289 A JP19197289 A JP 19197289A JP H0355735 A JPH0355735 A JP H0355735A
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- wire
- barium
- tungsten
- oxide
- 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
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 11
- 239000010937 tungsten Substances 0.000 claims abstract description 11
- 229910052788 barium Inorganic materials 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims abstract description 6
- HYXGAEYDKFCVMU-UHFFFAOYSA-N scandium oxide Chemical compound O=[Sc]O[Sc]=O HYXGAEYDKFCVMU-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims description 5
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 abstract description 12
- 239000011575 calcium Substances 0.000 abstract description 8
- 229910052712 strontium Inorganic materials 0.000 abstract description 7
- 229910052791 calcium Inorganic materials 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 3
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract 1
- 239000002585 base Substances 0.000 abstract 1
- 150000002736 metal compounds Chemical class 0.000 abstract 1
- 229910052706 scandium Inorganic materials 0.000 abstract 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 abstract 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004070 electrodeposition Methods 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 150000001341 alkaline earth metal compounds Chemical class 0.000 description 1
- 238000009125 cardiac resynchronization therapy Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Landscapes
- Solid Thermionic Cathode (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６０８４７４４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ｌ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３ｂが設け
られている．各陰極４と対応させ、上記絶縁性基仮ｌ上
に制御電極５を配設すると共に、陰極ワイヤー３ｂ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Ｆ！ｉ６、及びこのグリッド電極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．前記陰橋ワイヤー３はタングステン製であり、ま
た陰極４は、陰極ワイヤー３ｂ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）ＣＯ！ ）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。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. 6084744. FIG. 2 is a schematic cross-sectional view showing such a conventional flat panel display device. Cathode wires 3b holding electron emitting substances and forming cathodes 4 are provided at predetermined intervals. A control electrode 5 is disposed on the insulating substrate 1 in correspondence with each cathode 4, and a grid electrode F is provided with a through hole 6a above the cathode wire 3b at a position corresponding to each cathode 4! i6, and above the grid electrode 6, anodes 8 coated with a phosphor 7 at positions corresponding to the respective cathodes 4 are arranged at required intervals in the upward and downward directions, respectively. The negative bridge wire 3 is made of tungsten, and the cathode 4 is made of ternary carbonate of barium, strontium, and calcium ((Ba, Sr, Ca) CO by electrodeposition or coating on the surface of the cathode wire 3b. ) is deposited and thermally decomposed during 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 ).
なお、この際、上記陰極ワイヤー３ｂ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
て遇剰Ｂａを生戒する。このＢａは拡散時に陰極表面へ
移動し、ＢａＯ中でドナーを形或しエミッシａンに寄与
する。In addition, at this time, the tungsten of the cathode wire 3b reduces BaO in the electron emitting material through the following reaction and saves excess Ba. This Ba moves to the cathode surface during diffusion, forms a donor in BaO, and contributes to emitter A.
６ ＢａＯ ＋ Ｗ →ＢａＪＯｉ ＋ ３ ８ａ次
に動作について説明する。陰極ワイヤー３ｂ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。このときグリノド電極６及びアノード８
に正の電極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４ｂ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ｊＢ ｔ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、初期工
藁ツシジン電流が低くなり、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。6 BaO + W → BaJOi + 3 8a Next, the operation will be explained. When the cathode wire 3b is heated to about 700° C. by supplying power to both ends thereof, electrons are emitted from the surface of the cathode 4. At this time, the green electrode 6 and the anode 8
When a positive electrode is applied to the electron beam, the electron beam is guided to the phosphor 7 through the through hole 6a and excites the phosphor 7. On the other hand, if a negative voltage is applied to the control electrode 5, the electric field around the cathode 4 becomes negative with respect to the cathode 4b, and electron emission from the cathode 4 can be stopped. Therefore, for example, a positive pulse voltage is applied to the control electrode 5. By doing this, it becomes possible to control the emission of the electron beam. By the way, in such a linear hot cathode, the initial industrial current is affected by the process of replacing the carbonate with an oxide, or by the influence of impure gas emitted from the phosphor 7, the locking part 2, etc. during the initial operation of the display device. There were problems such as the brightness of the display device becoming low and the evacuation process for manufacturing the display device requiring a long time.
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或果を収め
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戊するＢａＪＯ．
は、経時的に耐熱金属及び電子放射物質の界面に蓄積さ
れて両者を隔てることにもなり、その結果過剰Ｂａの生
威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．
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。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 (Tokugan Sho 62-122053) [Problems to be Solved by the Invention] As we continued to research and develop such linear hot cathodes, we found that BaJO.
It has been confirmed that over time, Ba accumulates at the interface between the heat-resistant metal and the electron-emitting material, separating the two, which may impede the growth of excess Ba and become one of the causes of reduced life characteristics. It was done. In view of this problem, the inventors have made extensive studies and have arrived at this invention.
この発明の線状熱陰極は、タングステン金属中に酸化ス
カンジウムを０．１〜２重量％含有させてなる線状基体
上に、少なくともバリウムを含むアルヵり土類金属酸化
物を被着したことを特徴とするものである。The linear hot cathode of the present invention has an alkaline earth metal oxide containing at least barium deposited on a linear substrate made of tungsten metal containing 0.1 to 2% by weight of scandium oxide. This is a characteristic feature.
この発明においては、基体のタングステン金属中に所定
量含有させた酸化スカンジウムが、基体タングステンと
その上に被着された電子放射物質層間の界面に生戒する
上記Ｂａ．ＷＯ６などの中間層を分解する作用を示し、
その結果上記中間層の蓄積を印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。In this invention, scandium oxide contained in a predetermined amount in the tungsten metal of the base is present at the interface between the tungsten base and the electron emitting material layer deposited thereon. Shows the effect of decomposing intermediate layers such as WO6,
As a result, it is presumed that the accumulation of the intermediate layer mentioned above is suppressed and the deterioration of the above mentioned life characteristics is avoided. [Example] The present invention will be specifically explained below with reference to Examples.
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．セラ竃ツク板等で構戒した絶縁性基板、２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
、３ａはタングステン陰極ワイヤー ４は陰極ワイヤー
３ａにその長手方向に所要の間隔で形成された陰極、５
は制御電極、６はグリソド電極、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に渡す態様で陰極ワイヤー３ａ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。絶縁基板１上には前記各陰１４
と対向する位置に制御電極５を配設し、また、陰極ワイ
ヤー３３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電極６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。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, in which 1 is a glass plate. 2 is a locking portion mainly shaped as a metal protrusion or rib, 3a is a tungsten cathode wire, and 4 is a cathode wire 3a with a required spacing in the longitudinal direction. a cathode formed of 5
6 indicates a control electrode, 6 indicates a glisode 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 3a is passed to each of the locking portions 2, and the cathode 4 formed thereon is adjacent to the locking portions 2. It is strung up so that it is located between the two. Each shade 14 is provided on the insulating substrate 1.
A control electrode 5 is disposed at a position facing the cathode 4 , and above the cathode wire 33 is a grid electrode 6 having a through hole 6 a at a position facing the cathode 4 . Anodes 8 having phosphors 7 attached to opposing positions are arranged at intervals in the vertical direction.
以上のような横威は、実質的には陰極ワイヤー３ａを除
き第２図の従来品と略同一である。The above-mentioned width is substantially the same as that of the conventional product shown in FIG. 2, except for the cathode wire 3a.
陰極ワイヤーとしてはタングステンが用いられるが、０
．１〜２重量％の範囲で酸化スカンジウムＳｃｚＯ，を
含有させたものとする．
この酸化スカンジウムのタングステンへの混入は一般に
は線引き前にこれを行うのが好ましい．混入割合を０．
１ 〜２重量％に限定した理由は、下限未満ではこの発
明の目的である上記Ｂａ３１［６の分解作用で充分に得
られないこと、又上限を超えると、前述の線引き前のタ
ングステンへの混入カ著しく困難となり好ましくないか
らである。Tungsten is used as the cathode wire, but 0
．． It is assumed that scandium oxide SczO is contained in a range of 1 to 2% by weight. It is generally preferable to mix scandium oxide into tungsten before drawing the wire. The mixing ratio is 0.
The reason why it is limited to 1 to 2% by weight is that if it is less than the lower limit, sufficient decomposition of Ba31[6, which is the objective of this invention, cannot be obtained, and if it exceeds the upper limit, it will be mixed into the tungsten before wire drawing. This is because it becomes extremely difficult and undesirable.
次に陰極としては、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
属化合物からなる電子放射物質による電着液を用いる。Next, as a cathode, an electrodeposition liquid made of an electron emitting substance made of an alkaline earth metal compound such as barium, strontium, or calcium containing at least barium oxide is used.
具体的には、ＢａＯ：６４，ＳｒＯ： ３ ２， Ｃａ
ｂ： ４各重量％のものとした．これを従来と同碌の電
着法により膜厚８μで陰極ワイヤー３ｂ上に保持させ各
陰極を形威した。Specifically, BaO: 64, SrO: 3 2, Ca
b: 4% by weight. This was held on the cathode wire 3b with a film thickness of 8 μm using the same electrodeposition method as the conventional method to form each cathode.
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） ｃｏ，を（Ｂａ，Ｓｒ，Ｃａ）
Ｏに変え組成比の異る陰極を有する表示装置を作威し
た．実際に、上記タングステンワイヤーとしてＳｃｌ０
３ｌ重盪％を含むもの（実施例品）、及びＳｅｚＯ１を
含まないもの（比較例品）について、それら表示装置の
高輝度特性維持時間を測定したところ、本発明実施例品
は約１００００時間であったのに対し、比較例品は７０
００時間であった．即ちこの発明による寿命特性の向上
は従来品に対し約４割にも達した。Next, this is heated in the exhaust process of the display device to convert carbonate (Ba, Sr, Ca) co, to (Ba, Sr, Ca)
We created a display device with a cathode with a different composition ratio instead of O. Actually, as the above tungsten wire, Scl0
When we measured the high brightness characteristic maintenance time of the display devices for those containing SezO1 (example product) and those containing no SezO1 (comparative example product), it was found that the example product of the present invention lasted approximately 10,000 hours. In contrast, the comparative example product had a
It was 00 hours. In other words, the improvement in life characteristics achieved by this invention reached approximately 40% compared to conventional products.
以上説明したようにこの発明の陰極は、表示装置の高輝
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。As explained above, the cathode of the present invention exhibits excellent effects in increasing the brightness of display devices and maintaining the high performance of electron tube devices and the like for a long period of time, as well as extending the life of the cathode.
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・・・絶縁性基仮、２・・・係止部、３ｂ・・・陰極
タングステンワイヤー ４・・・陰極、５・・・制？！
Ｉ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 sectional view of a display device using the product of the present invention, and FIG. 2 is a schematic sectional view showing a conventional display device. 1... Insulating base temporary, 2... Locking part, 3b... Cathode tungsten wire 4... Cathode, 5... Control? !
I electrode, 6... Grid electrode, 7... Fluorescent material, 8.
··anode. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
重量％含有させてなる線状基体上に、少なくともバリウ
ムを含むアルカリ土類金属酸化物を被着したことを特徴
とする線状熱陰極。0.1-2 scandium oxide in tungsten metal
1. A linear hot cathode characterized in that an alkaline earth metal oxide containing at least barium is deposited on a linear substrate containing % by weight of an alkaline earth metal oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1191972A JPH0355735A (en) | 1989-07-24 | 1989-07-24 | Linear for cathode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1191972A JPH0355735A (en) | 1989-07-24 | 1989-07-24 | Linear for cathode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0355735A true JPH0355735A (en) | 1991-03-11 |
Family
ID=16283505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1191972A Pending JPH0355735A (en) | 1989-07-24 | 1989-07-24 | Linear for cathode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0355735A (en) |
-
1989
- 1989-07-24 JP JP1191972A patent/JPH0355735A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7095169B2 (en) | Flat panel display device | |
| US2686274A (en) | Thermionic cathode | |
| JPH0355735A (en) | Linear for cathode | |
| EP0263483B2 (en) | Hot cathode in wire form | |
| JPH0355736A (en) | Linear hot cathode | |
| JPH0393125A (en) | Linear thermal cathode | |
| JPH0355734A (en) | Linear hot cathode | |
| KR910001397B1 (en) | Hot cathode in wire form | |
| JPH0785395B2 (en) | Linear hot cathode | |
| KR100247820B1 (en) | Cathode for electron tube | |
| JPH08106852A (en) | Cathode for gas discharge panel, and method for forming it | |
| KR100573099B1 (en) | Cathode for electron tube | |
| KR100331059B1 (en) | Method for lighting the surface of Field Emission Display Device | |
| JPH0787068B2 (en) | Linear hot cathode | |
| KR100200664B1 (en) | Cathode for electron tube | |
| JPH01124926A (en) | Oxide cathode | |
| KR100246293B1 (en) | Cathode for emitting electrons and manufacturing method thereof | |
| JPH066704B2 (en) | Electron beam excited phosphor and method for producing the same | |
| JPH06299150A (en) | Fluorescent material and its production | |
| JPH04206325A (en) | Linear hot cathode | |
| KR100625959B1 (en) | Method for manufacturing cathode for electron tube | |
| JP2000040461A (en) | Cathode for electron tube | |
| JPH0554789A (en) | Electronic tube cathode and cathode-ray tube with said cathode | |
| KR20010098865A (en) | Cathode-ray tube cathode and alloy therefor | |
| JPS6290819A (en) | Cathode for electron tube |