JPH0228223B2 - KEIKOHYOJIKAN - Google Patents
KEIKOHYOJIKANInfo
- Publication number
- JPH0228223B2 JPH0228223B2 JP7828083A JP7828083A JPH0228223B2 JP H0228223 B2 JPH0228223 B2 JP H0228223B2 JP 7828083 A JP7828083 A JP 7828083A JP 7828083 A JP7828083 A JP 7828083A JP H0228223 B2 JPH0228223 B2 JP H0228223B2
- Authority
- JP
- Japan
- Prior art keywords
- getter
- cathode
- envelope
- fluorescent display
- anode
- 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
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 24
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 229910052725 zinc Inorganic materials 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 5
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 2
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 15
- 239000000843 powder Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 5
- 229910052788 barium Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910002555 FeNi Inorganic materials 0.000 description 2
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QVMHUALAQYRRBM-UHFFFAOYSA-N [P].[P] Chemical compound [P].[P] QVMHUALAQYRRBM-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 125000000101 thioether group Chemical group 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
- H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
- H01J31/15—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen with ray or beam selectively directed to luminescent anode segments
Landscapes
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Description
【発明の詳細な説明】
この発明は、蛍光表示管に関し、特にフイラメ
ント状の陰極の熱電子放出特性の劣化を防いで長
寿命化を図つた蛍光表示管に関する。加熱された
陰極から放出された電子を、蛍光体の被着された
陽極に選択的に射突させて文字・図形等の表示を
行う蛍光表示管は、発光色が良く、また低電圧駆
動が可能であり、消費電力も少ないなどの特長を
有しているため、電子機器等の表示装置として多
用されており、近時２種以上の表示機能をコンパ
クトにまとめた多色蛍光表示管が家電製品用など
に採用されはじめている。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorescent display tube, and more particularly to a fluorescent display tube that prevents deterioration of thermionic emission characteristics of a filament-shaped cathode and extends its life. Fluorescent display tubes, which display characters, figures, etc. by selectively projecting electrons emitted from a heated cathode onto an anode coated with phosphor, have good luminescent color and can be driven at low voltage. Because of its features such as low power consumption and low power consumption, it is often used as a display device for electronic devices, etc. Recently, multicolor fluorescent display tubes that compactly combine two or more types of display functions are being used in home appliances. It is beginning to be adopted for products.
ところで、一般に多色蛍光表示管は、その外囲
器内に、熱電子放出特性のよいアルカリ土類金属
の酸化物（たとえばBaO、SrO、CaOなど）が基
体金属（たとえばＷなど）細線の表面にコートさ
れたフイラメント状の陰極と、陽極導体上に前記
陰極から放出される熱電子を射突させることによ
つて発光表示する蛍光体の少くとも一部が硫化物
蛍光体（たとえばZnS等の蛍光体）を有する陽極
と、外囲器内を高真空雰囲気に維持するゲツター
（たとえばBa、Ba−Al、Ba−Mgなど）と、を
少くとも有する構造となつている。 By the way, in general, a multicolor fluorescent display tube has an alkaline earth metal oxide (e.g., BaO, SrO, CaO, etc.) with good thermionic emission characteristics in its envelope, which is made of a base metal (e.g., W, etc.) on the surface of a thin wire. At least a portion of the phosphor that emits light by colliding thermionic electrons emitted from the cathode onto a filament-like cathode coated with a cathode and an anode conductor is a sulfide phosphor (such as ZnS). The structure includes at least an anode having a phosphor (phosphor) and a getter (for example, Ba, Ba-Al, Ba-Mg, etc.) that maintains a high vacuum atmosphere inside the envelope.
ところが、この種の硫化物蛍光体を用いた多色
蛍光表示管では、点灯動作時に陽極に通電すると
硫化物蛍光体から電子の射突によつてＯ、O2な
どのほかに、Ｓ及びSO2など各種硫化物系有害ガ
スが発生して酸化物陰極の表面を汚染し、酸化物
陰極の熱電子放出特性いわゆるエミツシヨン特性
が経時とともに著しく低下してしまうという問題
点があつた。これは、従来から使用されているゲ
ツターでは、この発生した前記有害ガスのなかの
Ｓ及び硫化物系ガスを吸着する能力が殆んどない
ことに起因するもので、酸化物陰極の熱電子放出
特性が初期の半分におちて蛍光体の輝度を急激に
低下させるまでのいわゆる寿命が短く、このよう
な特性を有する従来の多色蛍光表示管は特に信頼
性および長寿命を必須要件とする車載用や航空宇
宙用には不向きであつた。 However, in multicolor fluorescent display tubes using this type of sulfide phosphor, when electricity is applied to the anode during lighting operation, electrons bombard from the sulfide phosphor, producing not only O, O2, etc., but also S and SO. There was a problem in that various sulfide-based harmful gases such as 2 were generated and contaminated the surface of the oxide cathode, and the thermionic emission characteristics of the oxide cathode, so-called emission characteristics, deteriorated significantly over time. This is due to the fact that the conventionally used getters have almost no ability to adsorb S and sulfide gases among the generated harmful gases, and the oxide cathode emits thermionic electrons. Conventional multicolor fluorescent display tubes have a short lifespan, until the characteristics drop to half of their initial value and the brightness of the phosphor rapidly decreases. It was unsuitable for commercial and aerospace applications.
この発明は、以上の点に鑑みてなされたもので
あつて、すなわちこの発明は、通電動作中に硫化
物蛍光体から発生する有害ガスを吸着して酸化物
陰極の汚染をなくすことで、陰極の熱電子放出特
性の劣化を防いで長時間安定した所定の輝度を保
つことができ、信頼性が高く長寿命を要する車載
用、航空宇宙用など多方面にわたり応用すること
ができる蛍光表示管を提供することを目的とす
る。 This invention has been made in view of the above points. In other words, this invention eliminates contamination of the oxide cathode by adsorbing harmful gases generated from the sulfide phosphor during current-carrying operation. Thermionic emission characteristics of the fluorescent display tubes can be prevented from deteriorating and a specified brightness can be maintained stably for a long period of time, making them highly reliable and applicable to a wide range of applications such as automotive and aerospace applications, which require long lifespans. The purpose is to provide.
したがつて、この目的を達成するためにこの発
明の蛍光表示管は、内部が高真空状態に保持され
る外囲器内に、少なくともアルカリ土類金属の酸
化物のコートを有するフイラメント状の陰極と、
陽極導体上に前記陰極から放出される熱電子を射
突させることによつて発光表示する蛍光体層を有
する陽極と、前記外囲器内を高真空雰囲気に維持
するゲツターと、を有する蛍光表示管において、
前記陽極の少なくとも一部は硫化物系の蛍光体層
を有し、かつ前記ゲツターは少なくとも二種類の
ゲツターを有するとともに、その一部は、Fe及
びZnの少なくとも一種類を主成分とするフラツ
シング形ゲツターであつて、他のゲツターとは離
隔した位置に有してなることを特徴とする。 Therefore, in order to achieve this object, the fluorescent display tube of the present invention includes a filament-shaped cathode having at least a coating of an alkaline earth metal oxide in an envelope whose interior is maintained in a high vacuum state. and,
A fluorescent display comprising: an anode having a phosphor layer that emits light by projecting thermoelectrons emitted from the cathode onto an anode conductor; and a getter that maintains a high vacuum atmosphere inside the envelope. In the pipe,
At least a part of the anode has a sulfide-based phosphor layer, and the getter has at least two types of getters, and part of the getter is a flushing type getter containing at least one type of Fe and Zn as a main component. The getter is characterized in that it is located at a position separated from other getters.
以下、図示の実施例によりこの発明を説明す
る。 The present invention will be explained below with reference to illustrated embodiments.
第１図は、この発明に係る蛍光表示管の第１の
実施例を示す斜視図、第２図は、第１図の矢視
−からみた断面図、第３図Ａは、同蛍光表示管
内に設けられてＳ及びSO2などの硫化物系の有害
ガスを吸着するゲツターの拡大斜視図、第３図Ｂ
は、同ゲツターのゲツターリングの断面図であ
る。 FIG. 1 is a perspective view showing a first embodiment of the fluorescent display tube according to the present invention, FIG. 2 is a sectional view taken from the direction of the arrow in FIG. 1, and FIG. Figure 3B is an enlarged perspective view of the getter that is installed in the air to adsorb sulfide-based harmful gases such as S and SO2
is a cross-sectional view of the getter ring of the same getter.
図中１は蛍光表示管の外囲器であり、内部が高
真空状態に保持される外囲器１は、絶縁性を有す
る材料、たとえばガラスからなる基板２と、四方
位置に立設された側面板３，３，４，４からなる
枠体を介して前記基板２と対向して配設された透
光性および絶縁性を有する材料、たとえばガラス
よりなる前面板５と、外囲器１内の排気用の排気
管６と、がガラス封着材により密封封着された構
成である。 In the figure, 1 is an envelope of a fluorescent display tube, and the envelope 1, whose interior is kept in a high vacuum state, is erected at four sides with a substrate 2 made of an insulating material, for example, glass. A front plate 5 made of a translucent and insulating material, such as glass, is arranged to face the substrate 2 via a frame made of side plates 3, 3, 4, and 4, and an envelope 1. The inner exhaust pipe 6 for exhaust gas is hermetically sealed with a glass sealing material.
前記構成の外囲器１内には、左右位置に配設さ
れ外部接続リード線Ｌ，Ｌを有する陰極支持体７
ａ，７ｂ間に張架された複数本のフイラメント状
の陰極８と、基板２の内面に所望の表示パターン
（実施例では日の字）で配置された各陽極導体９
上に前記各陰極８から放出する熱電子を射突させ
ることによつて発光表示する蛍光体層１０を有す
る陽極１１と、前記外囲器１内の真空雰囲気中で
加熱蒸飛させて外囲器１内のガスを積極的かつ不
可逆的に吸着する第１のゲツター１２と第２のゲ
ツター１３と、前記陰極８と陽極１１との間に設
けられた透光性を有するたとえばメツシユ状の制
御電極１４とを有している。 Inside the envelope 1 having the above structure, there is a cathode support 7 disposed at left and right positions and having external connection lead wires L, L.
A plurality of filament-like cathodes 8 stretched between a and 7b, and anode conductors 9 arranged in a desired display pattern (Japanese characters in the embodiment) on the inner surface of the substrate 2.
An anode 11 having a phosphor layer 10 thereon that emits light by bombarding it with thermoelectrons emitted from each of the cathodes 8; A first getter 12 and a second getter 13 that actively and irreversibly adsorb the gas in the vessel 1, and a translucent, for example, mesh-shaped control provided between the cathode 8 and the anode 11. It has an electrode 14.
前記陰極８は、たとえば基体金属であるＷ細線
の表面にアルカリ土類金属（Ba、Sr、Ca等）の
酸化物がコーテイングされたものであり、表面パ
ターンの少くとも一部の蛍光体層１０は、表示す
る発光色に応じて各種の硫化物蛍光体（たとえば
ZnS：Zn、ZnS：Ag＋In2O3、ZnS：Cu、Al＋
In2O3、ZnS：Au、Al＋In2O3、（ZnCd）Ｓ：
Ag、Cl、Y2O3S：Eu＋SnO2等）が用いられてい
る。 The cathode 8 is, for example, a W thin wire that is a base metal whose surface is coated with an oxide of an alkaline earth metal (Ba, Sr, Ca, etc.), and at least a part of the surface pattern is coated with a phosphor layer 10. Depending on the luminescent color to be displayed, various sulfide phosphors (e.g.
ZnS: Zn, ZnS: Ag + In 2 O 3 , ZnS: Cu, Al +
In 2 O 3 , ZnS:Au, Al+In 2 O 3 , (ZnCd)S:
Ag, Cl, Y2O3S :Eu+ SnO2, etc. ) are used.
また、前記第１のゲツター１２は、外囲器１内
の一方の隅部である前記陰極支持体７ａの一部に
支持部材を介して設けられている。この第１のゲ
ツター１２としては、高真空用ゲツター材料で知
られているたとえばBa、Ba−Al、Ba−Mgなど
の材料がNi、Feなどの保持部材によりリング状
に成形されたゲツターリング１５と、このゲツタ
ーリング１５を前記陰極支持体７ａに支持する支
持体１６を有している。 Further, the first getter 12 is provided at a part of the cathode support 7a, which is one corner of the envelope 1, via a support member. The first getter 12 is a getter ring 15 made of a material known as a getter material for high vacuum, such as Ba, Ba-Al, Ba-Mg, etc., and formed into a ring shape by a holding member such as Ni or Fe. , it has a support 16 that supports the getter ring 15 on the cathode support 7a.
一方、前記第２のゲツター１３は、外囲器１内
の他方の隅部である前記陰極支持体７ｂの一部に
支持部材を介して設けられている。この第２のゲ
ツター１３は、第３図Ａ，Ｂに示すように熱間圧
着法などで作成されたFe及びZnの少なくとも一
種類を主成分とする合せ材料、たとえば酸化に強
く取扱いの容易なNiを被覆したNiクラツドFeあ
るいはZnを被覆したZnクラツドFeがリング状に
成形されたゲツターリング１７と、このゲツター
リング１５の材料より溶融点の高い金属材料
（Ti、Ta、Mo等）により円板状に成形されてゲ
ツターリング１７を前記陰極支持体７ｂに支持す
る支持体１８を有している。 On the other hand, the second getter 13 is provided at a part of the cathode support 7b, which is the other corner of the envelope 1, via a support member. As shown in FIGS. 3A and 3B, the second getter 13 is made of a laminated material whose main component is at least one of Fe and Zn, which is made by hot pressing, etc., and which is resistant to oxidation and easy to handle. A getter ring 17 is formed into a ring shape of Ni-clad Ni-clad Fe or Zn-clad Fe coated with Zn, and a disk-shaped getter ring 17 is made of a metal material (Ti, Ta, Mo, etc.) with a higher melting point than the material of the getter ring 15. It has a support 18 which is formed to support the getter ring 17 on the cathode support 7b.
しかして、密封封着された外囲器１内を排気管
６を介して蛍光表示管として動作するに十分な高
真空雰囲気にした状態に排気し、排気管６を封止
する。 The sealed envelope 1 is then evacuated through the exhaust pipe 6 to a high vacuum atmosphere sufficient to operate as a fluorescent display tube, and the exhaust pipe 6 is sealed.
しかして、この排気管６を封止する前乃至封止
した後に、第１と第２のゲツター１２及び１３に
対して外囲器１外よりそれぞれ高周波誘導加熱あ
るいは外部接続リード部Ｌ，Ｌを介して通電加熱
する。この加熱処理により第１のゲツター１２の
ゲツターリング１５と第２のゲツター１３のゲツ
ターリング１７はゲツター材が蒸飛するまで十分
加熱され、ゲツターリング１５のゲツター材であ
るBaと、ゲツターリング１７のFeあるいはZnは
共に蒸飛されて、第１図に示すように、それぞれ
の対向する前面板５の内面に凝縮して活性化され
た鏡面状態のゲツター膜面１９，２０を蒸着形成
する。すなわち、ゲツターリング１５のBaが蒸
飛されると、蒸飛途中では分散ゲツター作用によ
り、そしてゲツター膜面１９を形成したのちでは
接触ゲツター作用によりH2、N2、O2などのガス
分子を積極的にかつ不可逆的に吸着して外囲器１
内の真空度を上昇し維持する。一方、これと同時
にゲツターリング１７のFeあるいはZnが蒸飛さ
れると、蒸飛途中では分散ゲツター作用により、
そしてゲツター膜面２０を蒸着形成したのちでは
接触ゲツター作用により、硫化物蛍光体よりなる
蛍光体層１０から陽極１１の通電動作中に発生す
るＳ及びSO2などの前記第１のゲツター１２では
吸着できない酸化いおう系有害ガス分子を積極的
に結合吸着する。 Before or after sealing the exhaust pipe 6, the first and second getters 12 and 13 are heated by high-frequency induction or external connection leads L, L are applied from outside the envelope 1, respectively. Electrification is applied through the tube to heat it. Through this heat treatment, the getter ring 15 of the first getter ring 12 and the getter ring 17 of the second getter ring 13 are sufficiently heated until the getter material evaporates, and the getter material Ba of the getter ring 15 and the Fe or Zn of the getter ring 17 are heated. Both are vaporized to form activated getter film surfaces 19 and 20 in a mirror-like state by vapor deposition on the inner surfaces of the respective opposing front plates 5, as shown in FIG. That is, when Ba in the getter ring 15 is evaporated, gas molecules such as H 2 , N 2 , O 2 , etc. are actively removed by the dispersion getter action during the evaporation and by the contact getter action after the getter film surface 19 is formed. permanently and irreversibly adsorbs the envelope 1.
Increase and maintain the vacuum level inside. On the other hand, if Fe or Zn in the getter ring 17 is evaporated at the same time, during the evaporation, due to the dispersed getter action,
After forming the getter film surface 20 by vapor deposition, the first getter 12 adsorbs S and SO 2 generated during the energization operation of the anode 11 from the phosphor layer 10 made of sulfide phosphor due to the contact getter action. It actively binds and adsorbs oxidized sulfur-based harmful gas molecules that cannot be produced.
上述したことから、外囲器１内は、残存してい
た各種有害ガスが完全に第１と第２のゲツター１
２，１３により吸着清掃されて外囲器１内は有害
ガスのない高真空状態に維持され、したがつて陰
極８は汚染されることなく、陰極８の熱電子放出
特性の劣化を極めて有効に防止することができ、
蛍光表示管の輝度を長時間維持することができ
る。 From the above, the various harmful gases remaining inside the envelope 1 are completely removed from the first and second getters 1.
2 and 13, the inside of the envelope 1 is maintained in a high vacuum state free of harmful gases, and therefore the cathode 8 is not contaminated, and the deterioration of the thermionic emission characteristics of the cathode 8 is extremely effectively prevented. can be prevented,
The brightness of the fluorescent display tube can be maintained for a long time.
ここで、上述した第１の実施例では第１と第２
のゲツター１２，１３をリング状のゲツターリン
グ１５，１７で構成したが、加熱により蒸飛でき
る形状であれば円板状であつてもその他の形状で
あつてもよい。また、通電加熱による加熱処理方
法を用いれば、外囲器１内を排気管６を介して排
気中であつても、第１と第２のゲツター１２，１
３のゲツターリング１５，１７を加熱蒸飛させて
外囲器１内の各ガスを吸着清掃することができ
る。 Here, in the first embodiment described above, the first and second
Although the getters 12 and 13 are constructed of ring-shaped getter rings 15 and 17, they may have a disk shape or any other shape as long as they can be vaporized by heating. Furthermore, if a heat treatment method using electrical heating is used, even if the inside of the envelope 1 is being evacuated through the exhaust pipe 6, the first and second getters 12, 1
The getter rings 15 and 17 of No. 3 can be heated and evaporated to adsorb and clean each gas in the envelope 1.
次に、この発明に係る蛍光表示管の第２の実施
例を説明する。第２の実施例の蛍光表示管は、第
４図と第５図に示すように第１の実施例と同様の
外囲器１０１を有し、この外囲器１０１内には第
１の実施例で用いられたのと同じ陰極１０８が陰
極支持体１０７ａ，１０７ｂ間に張架されている
と共に、各陽極導体１０９上の蛍光体層１１０の
少くとも一部には硫化物蛍光体が使用されてい
る。 Next, a second embodiment of the fluorescent display tube according to the present invention will be described. The fluorescent display tube of the second embodiment has an envelope 101 similar to that of the first embodiment, as shown in FIGS. The same cathode 108 used in the example is stretched between cathode supports 107a and 107b, and at least a portion of the phosphor layer 110 on each anode conductor 109 is made of sulfide phosphor. ing.
前記陰極支持体１０７ａ上には、第１実施例で
用いた第１のゲツター１２と同じ第１のゲツター
１１２が電気的に接続して設けられていると共
に、陰極支持体１０７ｂ上には、第２のゲツター
１１３が電気的に接続して設けられている。この
第２のゲツター１１３は、第６図に示すように
Fe粉末をたとえばMoなどのFeより溶融点の高い
金属材料で形成された筒状部材１１８内に充填し
て成る構成とし、Feを加熱蒸飛させるのが容易
なものとなつている。 A first getter 112, which is the same as the first getter 12 used in the first embodiment, is provided on the cathode support 107a and is electrically connected thereto. Two getters 113 are electrically connected. This second getter 113 is as shown in FIG.
Fe powder is filled in a cylindrical member 118 made of a metal material having a higher melting point than Fe, such as Mo, so that it is easy to heat and evaporate Fe.
しかして、外囲器１０１内が排気されたのち第
１の実施例で用いた加熱処理技術、すなわち外囲
器１０１外より高周波誘導加熱もしくは通電加熱
のいずれかにより、第１のゲツター１１２と第２
のゲツター１１３をそれぞれ加熱することによ
り、BaとFeが蒸飛され、各々前面板１０５の内
面にゲツター膜面１１９，１２０が蒸着される。
したがつて、第１の実施例と同様に、外囲器１０
１内に残存していた各種ガスが完全に吸着清掃さ
れて、外囲器１０１内は高真空状態に維持され、
通電動作中に硫化物の蛍光体層１１０から発生す
る有害ガスによる陰極１０８の汚染をなくして熱
電子放出特性の劣化を防げるので蛍光表示管の輝
度を長時間維持することができる。 After the inside of the envelope 101 is evacuated, the first getter 112 and the second 2
By heating the getter 113, Ba and Fe are evaporated, and getter film surfaces 119 and 120 are deposited on the inner surface of the front plate 105, respectively.
Therefore, similarly to the first embodiment, the envelope 10
The various gases remaining inside the envelope 101 are completely adsorbed and cleaned, and the inside of the envelope 101 is maintained in a high vacuum state.
Since contamination of the cathode 108 by harmful gases generated from the sulfide phosphor layer 110 during energization operation can be eliminated and deterioration of thermionic emission characteristics can be prevented, the brightness of the fluorescent display tube can be maintained for a long time.
なお、前記第２のゲツター１１３は、Zn粉末
をFeまたはFeNi合金材からなる筒状部材に充填
した構成としてもよい。また、第２のゲツター
は、第７図に示すようにFeあるいはZnの粉末を
これらより溶融点と同等か高いたとえばFe板、
Mo板、Ti板、あるいはTa板（合金になるのは
除く）からなる保持板２００上にのせた構成とし
てもよい。 Note that the second getter 113 may have a configuration in which a cylindrical member made of Fe or FeNi alloy is filled with Zn powder. In addition, as shown in Fig. 7, the second getter is made of Fe or Zn powder, for example, an Fe plate whose melting point is equal to or higher than that of the Fe or Zn powder.
It may also be configured to be placed on a retaining plate 200 made of a Mo plate, a Ti plate, or a Ta plate (excluding alloy plates).
ところで、上述した第１と第２の実施例におけ
る第１と第２のゲツター位置は、両者が互いに干
渉しないところ、すなわちBaが蒸飛してFeある
いはZnを被覆しないところに離した方が好まし
く、しかも電気的な絶縁を害さない場所として、
外囲器１，１０１の両端内壁付近が最適である。
また、第１と第２のゲツターの大きさは、その蛍
光表示管の大きさ形状等によつて適宜選択され
る。 By the way, it is preferable that the first and second getter positions in the above-mentioned first and second embodiments are separated so that they do not interfere with each other, that is, where Ba is not evaporated and Fe or Zn is not covered. , and as a place that does not harm electrical insulation.
The optimal location is near the inner walls at both ends of the envelope 1, 101.
Further, the sizes of the first and second getters are appropriately selected depending on the size and shape of the fluorescent display tube.
また、蛍光表示管に限らず硫化物蛍光体を用い
るブラウン管、真空管などのゲツターの一部を
FeおよびZnの少なくとも一種類を主成分とする
ゲツターを有するようにすれば、通電動作中に硫
化物蛍光体から発生する有害ガスによる酸化物陰
極の熱電子放出特性の低下を防いで輝度を長時間
維持できるのは勿論である。 In addition, some getters of not only fluorescent display tubes but also cathode ray tubes and vacuum tubes that use sulfide phosphors are
By having a getter mainly composed of at least one of Fe and Zn, the brightness can be increased by preventing the deterioration of the thermionic emission characteristics of the oxide cathode due to harmful gases generated from the sulfide phosphor during current-carrying operation. Of course, it can save time.
次に、本発明者らが作成したこの発明に係る蛍
光表示管の陰極寿命と従来の蛍光表示管の陰極寿
命とを比較した加速実験結果の一例を第８図と第
９図により説明する。 Next, an example of the results of an accelerated experiment comparing the cathode life of the fluorescent display tube according to the present invention prepared by the inventors with the cathode life of a conventional fluorescent display tube will be explained with reference to FIGS. 8 and 9.
第８図と第９図は、ともに縦軸に陰極の熱電子
放出効率の変化率（％）が、横軸に陰極の寿命
（hrs）がとられている。第８図は、赤橙発光色の
蛍光体（（Zn0.2Cd0.8）Ｓ：Ag、Cl）を有する蛍
光表示管において、ゲツター材料として従来の
Ba−Alゲツターのみを使用（折れ線）したも
のと、この発明によるBa−AlゲツターとZn系ゲ
ツターの併用（折れ線）したものの場合を示し
ている。また第９図は、青発光色の蛍光体
（ZnS：Zn）を有する蛍光表示管において、第８
図の場合と同様にゲツター材料として従来のBa
−Alゲツターのみを使用（折れ線）したもの
と、この発明によるBa−AlゲツターとFe系ゲツ
ターの併用（折れ線）したものの場合を示して
いる。なお、陰極の熱電子放出効率の変化率は、
陰極の初期の状態を100％としており、この変化
率が半減期（50％）以下になると蛍光体の発光輝
度を急激に低下させることがすでに知られてい
る。 In both FIGS. 8 and 9, the vertical axis represents the rate of change (%) in the thermionic emission efficiency of the cathode, and the horizontal axis represents the life span (hrs) of the cathode. Figure 8 shows the use of conventional getter materials in a fluorescent display tube with a reddish-orange phosphor ((Zn 0.2 Cd 0.8 )S:Ag, Cl).
The graphs show cases in which only Ba--Al getter is used (broken line) and cases in which Ba--Al getter and Zn-based getter according to the present invention are used in combination (broken line). FIG. 9 also shows that in a fluorescent display tube having a blue-emitting phosphor (ZnS:Zn),
As in the case of the figure, conventional Ba is used as the getter material.
-A case using only the Al getter (broken line) and a case using a combination of the Ba-Al getter and Fe-based getter according to the present invention (broken line) are shown. The rate of change in the thermionic emission efficiency of the cathode is
The initial state of the cathode is assumed to be 100%, and it is already known that when this rate of change falls below the half-life (50%), the luminance of the phosphor decreases rapidly.
第８図と第９図から明らかなように、Ba−Al
ゲツターのみを使用した蛍光表示管（折れ線
）における陰極の熱電子放出効率の半減期（50
％）に比べ、この発明によるBa−Alゲツターと
Zn系あるいはFe系ゲツターとを併用した蛍光表
示管（折れ線）における同半減期（50％）は
はるかに長く、たとえば第８図においては、10倍
以上の長寿命となつていることが判る。 As is clear from Figures 8 and 9, Ba-Al
Half-life of cathode thermionic emission efficiency (50
%) compared to the Ba-Al getter according to this invention.
The half-life (50%) of a fluorescent display tube (broken line) using a Zn-based or Fe-based getter in combination is much longer; for example, in Figure 8, it can be seen that the life is more than 10 times longer.
以上説明したように、この発明によれば、陰極
の少なくとも一部は各種の発光色のものがある硫
化物の蛍光体層を有し、かつ前記ゲツターの一部
は、Fe及びZnの少なくとも一種類を主成分とす
るゲツターを有してなる構成としたので、通電動
作中に硫化物蛍光体から発生する有害ガスをこの
Fe及びZnのゲツターが吸着して、酸化物陰極の
汚染をなくし陰極の熱電子放出特性の劣化を防い
で長時間所定の輝度を保つことができる優れた特
長を有するので硫化物蛍光体を用いた各種の発光
色の蛍光表示管の品質を向上し、かつ長寿命化に
多大の効果が得られ、特に信頼性及び長寿命を要
する車載用や航空宇宙用など多方面にわたり応用
できるようにした効果も極めて大である。 As explained above, according to the present invention, at least a part of the cathode has a sulfide phosphor layer that emits light of various colors, and a part of the getter includes at least one of Fe and Zn. Since the structure has a getter mainly composed of
Sulfide phosphors are used because they have the excellent feature of being able to absorb Fe and Zn getters, eliminate contamination of the oxide cathode, prevent deterioration of the cathode's thermionic emission characteristics, and maintain a specified brightness for a long time. It has improved the quality of fluorescent display tubes of various luminescent colors and has a significant effect on extending the lifespan, making it applicable to a wide range of applications such as automotive and aerospace applications, which require particularly high reliability and long lifespans. The effect is also extremely large.
また、この発明において、ゲツターをNiクラ
ツドFeあるいはZnクラツドFeで構成とすれば、
Feが酸化せず取り扱いやすくなる効果がある。
さらにゲツターをFe粉末をMoからなる筒状部材
に、あるいはZn粉末をFeまたはFeNi合金材から
なる筒状部材に充填した構成とすれば、Fe粉末
あるいはZn粉末を容易に加熱蒸飛させることが
できる効果がある。 In addition, in this invention, if the getter is composed of Ni-clad Fe or Zn-clad Fe,
This has the effect of making it easier to handle without oxidizing Fe.
Furthermore, if the getter is configured such that Fe powder is filled in a cylindrical member made of Mo or Zn powder is filled in a cylindrical member made of Fe or FeNi alloy material, the Fe powder or Zn powder can be easily heated and evaporated. There is an effect that can be done.
第１図は、この発明に係る蛍光表示管の第１の
実施例を示す斜視図、第２図は、第１図の矢視
−からみた断面図、第３図Ａは、同蛍光表示管
内に設けられてＳ、SO2などの有害ガスを吸着す
るゲツターの拡大斜視図、第３図Ｂは、同ゲツタ
ーのゲツターリングの断面図、第４図は、この発
明に係る蛍光表示管の第２の実施例を示す斜視
図、第５図は、第４図の矢視−からみた断面
図、第６図は、同蛍光表示管内に設けられて有害
ガスを吸着するゲツターの拡大斜視図、第７図
は、FeあるいはZn粉末をFe板などにのせて成る
ゲツターの拡大斜視図、第８図と第９図は、本発
明者らが作成したこの発明に係る蛍光表示管の陰
極の寿命と従来の蛍光表示管の陰極の寿命とを比
較した加速実験結果の一例を示す図である。
１，１０１……外囲器、８，１０８……陰極、
１０，１１０……蛍光体層、１１……陽極、１
２，１１２……第１のゲツター、１３，１１３…
…第２のゲツター、１７……第１の実施例におけ
る第２のゲツターを構成するゲツターリング、１
１８……第２の実施例における第２のゲツターを
構成する筒状部材。
FIG. 1 is a perspective view showing a first embodiment of the fluorescent display tube according to the present invention, FIG. 2 is a sectional view taken from the arrow direction in FIG. 1, and FIG. 3A is an inside view of the fluorescent display tube. FIG. 3B is a sectional view of the getter ring of the getter, and FIG. 4 is a second view of the getter ring of the getter according to the present invention. FIG. 5 is a cross-sectional view taken from the direction indicated by the arrow in FIG. 4, and FIG. Fig. 7 is an enlarged perspective view of a getter made by placing Fe or Zn powder on an Fe plate, etc., and Figs. 8 and 9 show the life span of the cathode of the fluorescent display tube according to the present invention, which was created by the present inventors. FIG. 3 is a diagram showing an example of the results of an accelerated experiment comparing the life of a cathode of a conventional fluorescent display tube. 1,101... Envelope, 8,108... Cathode,
10, 110...phosphor layer, 11... anode, 1
2,112...first getter, 13,113...
...Second getter, 17...Getter ring constituting the second getter in the first embodiment, 1
18...A cylindrical member constituting the second getter in the second embodiment.
Claims (1)
少なくともアルカリ土類金属の酸化物のコートを
有するフイラメント状の陰極と、陽極導体上に前
記陰極から放出される熱電子を射突させることに
よつて発光表示する蛍光体層を有する陽極と、前
記外囲器内を高真空雰囲気に維持するゲツター
と、を有する蛍光表示管において、前記陽極の少
なくとも一部は硫化物系の蛍光体層を有し、かつ
前記ゲツターは少なくとも二種類のゲツターを有
するとともに、その一部は、Fe及びZnの少なく
とも一種類を主成分とするフラツシング形のゲツ
ターであつて、他のゲツターとは離隔した位置に
有してなることを特徴とする蛍光表示管。 ２ 前記Fe乃至Znのゲツターは、外囲器外より
の高周波誘導加熱または通電加熱のいずれかによ
り加熱される構成になる特許請求の範囲第１項記
載による蛍光表示管。[Claims] 1. In an envelope whose interior is maintained in a high vacuum state,
a filament-shaped cathode having at least a coating of an oxide of an alkaline earth metal; an anode having a phosphor layer that emits light by causing thermoelectrons emitted from the cathode to collide onto an anode conductor; A fluorescent display tube having a getter for maintaining a high vacuum atmosphere inside the envelope, wherein at least a part of the anode has a sulfide-based phosphor layer, and the getter has at least two types of getters. Further, a part of the getter is a flashing type getter containing at least one of Fe and Zn as a main component, and is located at a position separated from other getters. 2. The fluorescent display tube according to claim 1, wherein the getter of Fe to Zn is heated by either high-frequency induction heating or electrical heating from outside the envelope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7828083A JPH0228223B2 (en) | 1983-05-06 | 1983-05-06 | KEIKOHYOJIKAN |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7828083A JPH0228223B2 (en) | 1983-05-06 | 1983-05-06 | KEIKOHYOJIKAN |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59224034A JPS59224034A (en) | 1984-12-15 |
| JPH0228223B2 true JPH0228223B2 (en) | 1990-06-22 |
Family
ID=13657548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7828083A Expired - Lifetime JPH0228223B2 (en) | 1983-05-06 | 1983-05-06 | KEIKOHYOJIKAN |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0228223B2 (en) |
-
1983
- 1983-05-06 JP JP7828083A patent/JPH0228223B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59224034A (en) | 1984-12-15 |
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