JPS63285836A - Linear hot cathode - Google Patents
Linear hot cathodeInfo
- Publication number
- JPS63285836A JPS63285836A JP62122052A JP12205287A JPS63285836A JP S63285836 A JPS63285836 A JP S63285836A JP 62122052 A JP62122052 A JP 62122052A JP 12205287 A JP12205287 A JP 12205287A JP S63285836 A JPS63285836 A JP S63285836A
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- earth metal
- oxide
- rare earth
- metal 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.)
- Granted
Links
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000292 calcium oxide Substances 0.000 claims abstract description 25
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims abstract description 13
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims abstract description 11
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 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
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 5
- 229910052721 tungsten Inorganic materials 0.000 abstract description 5
- 239000010937 tungsten Substances 0.000 abstract description 5
- HYXGAEYDKFCVMU-UHFFFAOYSA-N scandium(III) oxide Inorganic materials O=[Sc]O[Sc]=O HYXGAEYDKFCVMU-UHFFFAOYSA-N 0.000 abstract description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract 1
- 229910000421 cerium(III) oxide Inorganic materials 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 abstract 1
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 abstract 1
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 239000011733 molybdenum Substances 0.000 abstract 1
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 abstract 1
- 229910052715 tantalum Inorganic materials 0.000 abstract 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 abstract 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 abstract 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 13
- 239000011575 calcium Substances 0.000 description 6
- 229910052712 strontium Inorganic materials 0.000 description 6
- 229910052788 barium Inorganic materials 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Inorganic materials [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000004070 electrodeposition Methods 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000009125 cardiac resynchronization therapy Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 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
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000002195 synergetic effect 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〕
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。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a linear hot cathode used in vacuum tubes, CRTs, fluorescent display tubes, and the like.
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は第４図に示す如きものが
ある（特開昭６０−８４７４４号）。Various devices using linear hot cathodes have been proposed in the past.
For example, there is a flat panel display device as shown in FIG. 4 (Japanese Patent Application Laid-open No. 84744/1983).
第４図は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に渡して、所定の間隔で電子放
射物質を保持させて陰極４ｂを形成した陰極ワイヤー３
を張架し、各陰極４ｂと対応させて絶縁性基板１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４ｂと対応した位置に貫通孔６ａを備えたグリッ
ド電極６を、更にこのグリッド電極６の上方には上記各
陰極４ｂに対応した位置に蛍光体７を塗布したアノード
８を夫々上１、下方向に所要の間隔を隔てて配設して構
成しである。FIG. 4 is a schematic cross-sectional view showing a conventional flat panel display device. The cathode wire 3 holds an electron emitting substance to form the cathode 4b.
A control electrode 5 is arranged on the insulating substrate 1 in correspondence with each cathode 4b, and a grid electrode is provided above the cathode wire 3 with a through hole 6a at a position corresponding to each cathode 4b. 6, and above the grid electrode 6, anodes 8 coated with phosphor 7 are arranged at positions corresponding to the respective cathodes 4b at required intervals in the upper and lower directions, respectively. be.
前記陰極ワイヤー３はタングステン製であり、また陰極
４ｂ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）ＣＯ３）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。The cathode wire 3 is made of tungsten, and the cathode 4b has a ternary carbonate of barium, strontium, and calcium ((Ba, Sr, Ca) CO3) deposited on the surface of the cathode wire 3 by electrodeposition or coating. The above carbonate is converted into an oxide ((Ba.
Ｓｒ、 Ｃａ） ０ ）に変換して形成しである。なお
、この際に陰極ワイヤー３のタングステンとの反応で電
子放射物質中のＢａＯが還元されて全屈Ｂａを生成する
が、このＢａは拡散等によって陰極表面へ移動し、Ｂａ
Ｏ，ＳｒＯ，ＣａＯの表面に吸着して、所謂ｎ型半導体
構造を構成し、陰極４ｂ表面の仕事関数を低下させ、エ
ミッションに寄与することとなる。なおりａがＣａＯ上
に吸着した場合においてエミッションに対する寄与が最
も大きく表れる。It is formed by converting it into Sr, Ca) 0 ). At this time, BaO in the electron emitting material is reduced by the reaction with the tungsten of the cathode wire 3 to produce totally bent Ba, but this Ba moves to the cathode surface by diffusion etc.
It is adsorbed on the surfaces of O, SrO, and CaO, forming a so-called n-type semiconductor structure, lowering the work function of the surface of the cathode 4b, and contributing to emissions. When Naori a is adsorbed on CaO, its contribution to emissions is greatest.
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 ’Ｃに加熱すると陰極４ｂ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。Next, the operation will be explained. When the cathode wire 3 is heated to about 700'C by supplying power to both ends thereof, electrons are emitted from the surface of the cathode 4b. At this time, if a positive electrode is applied to the grid electrode 6 and the anode 8, the electron beam will be transmitted through the through hole 6a.
The light is guided to the phosphor 7 through the phosphor 7 and excites the phosphor 7.
−力制御電極５に負の電圧を印加すると陰極４ｂ周辺の
電界が陰＋ｉ４ｂに対して負となり、陰極４Ｆ）からの
電子放射を停止せしめ１１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＄制御できることとなる。- When a negative voltage is applied to the force control electrode 5, the electric field around the cathode 4b becomes negative with respect to the negative +i4b, stopping electron emission from the cathode 4F). Therefore, for example, applying a positive pulse voltage to the control electrode 5 By applying this voltage, the emission of the electron beam can be controlled by $.
ところで従来の線状熱陰極は前述した如く炭酸塩を酸化
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Ｈにより、
初期エミッション電流が低くなり、また長時間動作させ
ると、Ｂａの消耗が大きいためにエミッション電流が低
下し、輝度の低下が著しいなどの問題点があった。By the way, as mentioned above, the conventional linear hot cathode uses the phosphor 7. Due to the shadow H of impure gas released from the locking part 2, etc.,
There are problems in that the initial emission current is low, and when operated for a long time, the emission current decreases due to large consumption of Ba, resulting in a significant decrease in brightness.
この発明は上記のような問題点を解消するためになされ
たもので、初期エミッション電流が高く、しかも長時間
動作後もエミッション電流の低下が少なく長期にわたり
高い輝度を維持しく７る線状熱陰極を提供することを目
的とする。This invention was made in order to solve the above-mentioned problems, and provides a linear hot cathode that has a high initial emission current, has a small drop in emission current even after long-term operation, and maintains high brightness over a long period of time. The purpose is to provide
この発明に係る線状熱陰極は０．２〜２０重量％の希土
類金属酸化物と、酸化バリウム及び酸化カルシウムを含
んだアルカリ土類全屈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カルシウムの重量比を０
．０２〜０．７とした電子放射物質を線状の耐熱性金属
表面に保持したものである。The linear hot cathode according to the present invention is a mixture containing 0.2 to 20% by weight of a rare earth metal oxide and an alkaline earth total oxide containing barium oxide and calcium oxide,
The weight ratio of calcium oxide to rare earth metal oxide is 0.
．． 02 to 0.7 is held on the surface of a linear heat-resistant metal.
この発明における線状熱陰極は電子放射物質中の希土類
金属酸化物により電子放射物質が活性化され、且つ陰極
表面での不純物の作用を抑制し、初期エミッション電流
が高く、しかも長時間動作後におけるエミッション電流
の低下も少ない。In the linear hot cathode of this invention, the electron emitting material is activated by the rare earth metal oxide in the electron emitting material, and the action of impurities on the cathode surface is suppressed, so that the initial emission current is high, and moreover, after long-term operation, The drop in emission current is also small.
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、セラミック板等で構成した絶縁性基板、２は主
として金属型の突起又はリブ等として形成される係止部
、３はタングステン等の６（熱性金属製の陰極ワイヤー
、４ａは陰極ワイヤー３にその長手方向に所要の間Ｆｌ
’Ｘで形成された陰極、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。FIG. 1 is a schematic 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 an insulating substrate made of a glass plate, a ceramic plate, etc.; 3 is a cathode wire made of 6 (thermal metal) such as tungsten, and 4a is a locking portion mainly formed as a metal protrusion or rib.
'X indicates a cathode, 5 is a control electrode, 6 is a grid electrode, and 8 is an anode.
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３を、これに形
成した陰極４ａが相隣する係＋１：部２゜２間に位置す
るよう張架し、絶縁性基板１トには前記各陰極４ａ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
３の上方には前記陰ｐ１ｇ ４ ｒｒと対向する位置に
貫通孔６ａを開口したグリッド電極６を、更にその上に
は前記陰極４ａと対向する位置に蛍光体７を付したアノ
ード８を夫々上下方向に所要の間隔を隔てて配設しであ
る。A plurality of locking portions 2 are provided at regular intervals on an insulating substrate 1, and a cathode wire 3 is passed through each of the locking portions 2, and the cathodes 4a formed thereon are connected to adjacent portions +1: portions 2゜2. A control electrode 5 is disposed on the insulating substrate 1 at a position facing each of the cathodes 4a, and a control electrode 5 is provided above the cathode wire 3 to face the cathode p1g4rr. A grid electrode 6 with a through hole 6a opened therein, and an anode 8 on which a phosphor 7 is attached at a position facing the cathode 4a are arranged at a required interval in the vertical direction. .
このような構成は前記陰極４ａを除き前記第２図に示し
た従来品と実質的に同じである。This structure is substantially the same as the conventional product shown in FIG. 2, except for the cathode 4a.
そして本発明に係る実施例の陰＋ｆｆ１４ａには０．２
〜２０重量％の希土類金属酸化物と、残部が少なくとも
酸化バリウムと酸化カルシウムとを含ムアルカリ土類全
屈酸化物との混合物とからなり、希土類金属酸化物に対
する酸化カルシウムのｆｆ１ｆ重量比を０．０２〜０．
７、望ましくは０．０４〜０．３とした電子放射物質を
用いる。And 0.2 for the shade +ff14a of the embodiment according to the present invention.
It consists of a mixture of ~20% by weight of rare earth metal oxide and the balance is a totally alkaline earth oxide containing at least barium oxide and calcium oxide, and the ff1f weight ratio of calcium oxide to rare earth metal oxide is 0. 02~0.
7. Use an electron-emitting material with a value of preferably 0.04 to 0.3.
なお前記希土類金属酸化物としては５ｃ２０３． Ｌａ
２Ｏ３゜Ｙ２０３ ＋ Ｇｄ ２０３＋ Ｃｅ ２０３
等が用いられる。The rare earth metal oxide is 5c203. La
2O3゜Y203 + Gd 203+ Ce 203
etc. are used.
希土類金属酸化物に対する酸化カルシウムのｍｍ比を０
．０２〜０．７とするのは次の理由による。The mm ratio of calcium oxide to rare earth metal oxide is 0.
．． The reason why it is set to 02 to 0.7 is as follows.
即ち、Ｂａｄニア５重量％、 ＳｒＯ：１０ｆｆｌ量％
とし、ＣａＯとＳｃ ２０３との混合物が１５正皿％に
なる範囲内でＣａｂ／５Ｃ２０３（重量比）を変化させ
て、Ｓｃ ２（ＣＯ３） ３の含有率を異にする複数の
電着液を作成し、従来と同様の電着法に基づき、従来と
ほぼ同一の膜厚（８μｍ）で電子放射物質を陰極ワイヤ
ー３に保持せしめて各陰極を作成した後、これを表示装
置の排気過程において加熱し、（Ｂａ、Ｓｒ、Ｃａ）Ｃ
Ｏ３−３ｃ２（Ｃ０３） ３を（Ｂａ、Ｓｒ、 Ｃａ）
Ｏ−Ｓｃ２０３に変えて夫々組成比の異なる陰極を有す
る表示装置を作成した。That is, Bad Near 5% by weight, SrO: 10ffl amount%
Then, by changing the Cab/5C203 (weight ratio) within the range where the mixture of CaO and Sc203 is 15%, a plurality of electrodeposition solutions with different contents of Sc2(CO3)3 were prepared. After creating each cathode by holding the electron-emitting substance on the cathode wire 3 with almost the same film thickness (8 μm) as in the conventional method using the same electrodeposition method as before, this is used in the evacuation process of the display device. Heating, (Ba, Sr, Ca)C
O3-3c2 (C03) 3 (Ba, Sr, Ca)
Display devices having cathodes having different composition ratios in place of O-Sc203 were fabricated.
この各表示装置について２時間動作後、フィラメント電
流を一定にした時のパルスエミッション電流値を測定し
た。その結果を第３図に示す。第３図に示すグラフは横
軸にＢａＯ，ＳｒＯ，ＣａＯ，５ｃ２０３を含む混合物
中のＳｃ ２０３に対するＣａＯの重量比をとり、また
Ｎ軸には従来品のパルスエミッション電流値を１００と
した時の相対電流値をとって示してあ′る。このグラフ
から明らかなように、５ｃ２０３に対するＣａＯの重量
比が０．０２〜０．７であればパルスエミッション電流
の増加傾向が顕著であり、特に重量比が０．０４〜０，
３の範囲で高いパルスエミッション電流が得られること
が解る。After each display device had been operated for 2 hours, the pulse emission current value was measured when the filament current was kept constant. The results are shown in FIG. In the graph shown in Figure 3, the horizontal axis shows the weight ratio of CaO to Sc203 in a mixture containing BaO, SrO, CaO, and 5c203, and the N axis shows the pulse emission current value of the conventional product set to 100. The relative current values are shown. As is clear from this graph, when the weight ratio of CaO to 5c203 is 0.02 to 0.7, the pulse emission current tends to increase significantly, and especially when the weight ratio is 0.04 to 0,
It can be seen that a high pulse emission current can be obtained in the range of 3.
次にこの発明に基づき陰極ワイヤーにＣａＯと５ｃ２０
３との和を種々変化させた電子放射物質（但し５ｃ２０
３に対するＣａＯのｆｆＺｆｉＬ比は０．６とした）を
保持した陰極と、同しく陰極ワイヤーに（Ｂａ、Ｓｒ、
Ｃａ）０からなる電子放射物質（但しＢａＯに対する
ＳｒＯの重量比ば５とした）を保持した従来の陰極出を
各々配設した複数種類の表示装置を作成した。Next, based on this invention, CaO and 5c20 were added to the cathode wire.
Electron-emitting substances with various sums with 3 (however, 5c20
The ffZfiL ratio of CaO to 3 was set to 0.6), and the cathode wire also contained (Ba, Sr,
A plurality of types of display devices each having a conventional cathode emitting material holding an electron emitting material made of Ca) 0 (however, the weight ratio of SrO to BaO was 5) were created.
他の条件は全て同じである。なお蛍光体には低速電子線
用蛍光体（ＺｎＯ：Ｚｎ）を用い、直径が４．０１の円
形パターンを数個配設したものを用いた。All other conditions are the same. Note that a phosphor for low-speed electron beams (ZnO:Zn) was used as the phosphor, and several circular patterns each having a diameter of 4.01 cm were arranged.
従来品と実施例に関して、フィラメント電圧、アノード
電圧及びグリッド電圧を同一条件にして５１囚の表示装
置を１０００時間動作させ、その時の蛍光体の輝度を測
定し、その平均値を求め、従来品及び実施例の各々２時
間動作後における平均輝度（１００とした）に対する相
対輝度を求めた。結果は第４図に示すとおりである。Regarding the conventional product and the example, 51 display devices were operated for 1000 hours under the same conditions of filament voltage, anode voltage, and grid voltage, the luminance of the phosphor at that time was measured, and the average value was determined. The relative brightness with respect to the average brightness (set to 100) after 2 hours of operation in each of the examples was determined. The results are shown in Figure 4.
第４図に示すグラフは横軸にＣａＯ＋５ｃ２０３の重量
％を、また縦軸には相対輝度をとって示しである。The graph shown in FIG. 4 shows weight percent of CaO+5c203 on the horizontal axis and relative brightness on the vertical axis.
このグラフから明らかなように実施例ではＣａＯ＋ Ｓ
ｃ ２０３が１．３〜２０重■％の範囲で優れた輝度特
性を示し、特にＣａＯ→−５ｃ２０３が４〜１６正量％
の範囲で輝度の低下が少なく極めて良好な特性を示して
いることが解る。なお従来品の輝度特性は×印でプロッ
トしである。As is clear from this graph, in the example, CaO+S
Excellent brightness characteristics are exhibited in the range of 1.3 to 20% by mass of c203, especially when CaO→-5c203 is 4 to 16%
It can be seen that within the range of , there is little decrease in brightness and extremely good characteristics are exhibited. The brightness characteristics of the conventional product are plotted with an x mark.
また１０００時間動作後、蛍光体をＸ層マイクロアナラ
イザーで分析したところ、従来品の蛍光体からは実施例
の蛍光体におけるよりも多口のＢａが検出された。この
ことから実施例では動作中における蛍光体側へのＭ％に
よるＢａの消耗が少ないことが推測され、このことが実
施例における輝度特性を高く維持し得ている理由の一つ
と考えられる。Furthermore, when the phosphor was analyzed using an X-layer microanalyzer after 1000 hours of operation, more Ba was detected in the conventional phosphor than in the phosphor of the example. From this, it is inferred that in the example, the consumption of Ba due to M% to the phosphor side during operation is small, and this is considered to be one of the reasons why the brightness characteristics in the example can be maintained high.
Ｂａの消耗が少ない理由は陰極ワイヤー３のタングステ
ンとの反応で逼元されたＢａが本発明にあってはＳｃ
２０３上に吸着されてエミッションに寄与することとな
るが、５ｃ２０３は耐熱性、耐電子ｔ１ｊ撃性に優れて
いるのでＣａＯとの相乗効果によりエミッションを増加
させると同時に、動作中のＢａの消耗を抑制することに
依ると考えられる。The reason why the consumption of Ba is small is that Ba concentrated by the reaction with tungsten of the cathode wire 3 is
5c203 is adsorbed on CaO and contributes to emissions, but since 5c203 has excellent heat resistance and electron attack resistance, its synergistic effect with CaO increases emissions and at the same time reduces Ba consumption during operation. It is thought that it depends on the suppression.
この結果、実施例では初期輝度が高いことは勿論、長時
間動作後の残存輝度も高いので表示装置が明るい場所で
も使用可能になる。As a result, in the embodiment, not only the initial brightness is high, but also the residual brightness after long-time operation is high, so that the display device can be used even in bright places.
また陰極ワイヤー３に流れる電流値を増加させて高輝度
化を実現する場合には、特に寿命特性の向上に顕著な効
果を有する。Moreover, when increasing the current value flowing through the cathode wire 3 to achieve high brightness, it has a particularly remarkable effect on improving life characteristics.
なお上述した実施例では線状耐熱性全屈としてタングス
テン線を用いた場合につき説明したが何等これに限定さ
れるものではな（、主成分がＭｏ。In the above-mentioned embodiments, the case where a tungsten wire was used as the linear heat-resistant fully bendable wire was explained, but the invention is not limited to this in any way (the main component is Mo).
Ｔａ、Ｐｔなどの場合も同様の効果が１ｑられる。また
陰極の形状は実施例では直線状とした場合を示したが何
らこれに限るものではなく、仮状、コイル状、スパイラ
ル状など任息の線状陰極形状でも上記した効果はえられ
る。更に実施例は平板型表示装置に通用した場合につき
説明したが、蛍光表示管、線状熱陰極を用いたＣＲＴ、
電子顕微鏡、蛍光ランプにも通用し１４ることは勿論で
ある。A similar effect is obtained in the case of Ta, Pt, etc. Further, although the cathode shape is shown in the embodiment as a straight line, it is not limited to this in any way, and the above-mentioned effects can be obtained with any linear cathode shape such as a temporary shape, a coil shape, or a spiral shape. Furthermore, although the embodiments have been described with reference to cases applicable to flat panel display devices, fluorescent display tubes, CRTs using linear hot cathodes,
Of course, it can also be used in electron microscopes and fluorescent lamps.
以上説明したようにこの発明の陰極は初期エミッション
電流が大きく、また動作中におけるエミッション電流の
維持機能にも優れているので表示装置の高輝度化、電子
管装置などの高性能化に侵れた効果を奏するものである
。As explained above, the cathode of the present invention has a large initial emission current and is also excellent in maintaining the emission current during operation, so it is effective in increasing the brightness of display devices and improving the performance of electron tube devices. It is something that plays.
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Ｓｃ ２０３に対するＣａＯの正口比とパルスエ
ミッション電流との関係を示す特性図、第３図は表示装
置の１０００時間の動作後の輝度とＣａＯ及びＳｃ ２
０３の型車％との関係を示す特性図、第４図は従来の表
示装置を示す模式的断面図である。
■・・・絶縁性基板 ２・・・係止部
３・・・陰極ワイヤー ４ａ・・陰極 ５・・・制（〕
１１電極６・・・グリッド電（伝 ７・・・蛍光体 ８
・・・アノードなお、図中、同−符最−は同一、又は、
ｔｌｌ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, Fig. 2 is a characteristic diagram showing the relationship between the positive aperture ratio of CaO to Sc 203 and pulse emission current, and Fig. 3 is a schematic cross-sectional view of a display device using the product of the present invention. Luminance and CaO and Sc2 after operation of time
03 is a characteristic diagram showing the relationship with model car percentage, and FIG. 4 is a schematic cross-sectional view showing a conventional display device. ■... Insulating substrate 2... Locking part 3... Cathode wire 4a... Cathode 5... Control ()
11 Electrode 6... Grid electrode (den) 7... Fluorescent material 8
・・・Anode In the figures, the same number and the top are the same, or
This shows the part corresponding to tll.
Claims (1)
リウム及び酸化カルシ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
る酸化カルシウムの重量比を０．０２〜０．７とした電
子放射物質を線状の耐熱性金属表面に保持してあること
を特徴とする線状熱陰極。1. A mixture containing 0.2 to 20% by weight of a rare earth metal oxide and an alkaline earth metal oxide containing barium oxide and calcium oxide, the weight ratio of calcium oxide to rare earth metal oxide being 0. A linear hot cathode characterized in that an electron emitting material having a particle diameter of .02 to 0.7 is held on a linear heat-resistant metal surface.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12205287A JPH0785395B2 (en) | 1987-05-18 | 1987-05-18 | Linear hot cathode |
| US07/105,668 US4897574A (en) | 1986-10-07 | 1987-10-05 | Hot cathode in wire form |
| DE3780246T DE3780246T3 (en) | 1986-10-07 | 1987-10-06 | Wire-shaped hot cathode. |
| EP87114566A EP0263483B2 (en) | 1986-10-07 | 1987-10-06 | Hot cathode in wire form |
| CA000548815A CA1276965C (en) | 1986-10-07 | 1987-10-07 | Hot cathode in wire form coated with rare and alkaline earth metal oxides containing barium oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12205287A JPH0785395B2 (en) | 1987-05-18 | 1987-05-18 | Linear hot cathode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63285836A true JPS63285836A (en) | 1988-11-22 |
| JPH0785395B2 JPH0785395B2 (en) | 1995-09-13 |
Family
ID=14826423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12205287A Expired - Fee Related JPH0785395B2 (en) | 1986-10-07 | 1987-05-18 | Linear hot cathode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0785395B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0641006A1 (en) * | 1993-08-24 | 1995-03-01 | Samsung Display Devices Co., Ltd. | Cathode for an electron tube |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4833677A (en) * | 1971-09-03 | 1973-05-11 | ||
| JPS4912758A (en) * | 1972-05-12 | 1974-02-04 | ||
| JPS6084744A (en) * | 1983-10-15 | 1985-05-14 | Matsushita Electric Ind Co Ltd | Hot cathode |
-
1987
- 1987-05-18 JP JP12205287A patent/JPH0785395B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4833677A (en) * | 1971-09-03 | 1973-05-11 | ||
| JPS4912758A (en) * | 1972-05-12 | 1974-02-04 | ||
| JPS6084744A (en) * | 1983-10-15 | 1985-05-14 | Matsushita Electric Ind Co Ltd | Hot cathode |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0641006A1 (en) * | 1993-08-24 | 1995-03-01 | Samsung Display Devices Co., Ltd. | Cathode for an electron tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0785395B2 (en) | 1995-09-13 |
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