JPH0641046U - Fluorescent display tube - Google Patents
Fluorescent display tubeInfo
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- JPH0641046U JPH0641046U JP7611292U JP7611292U JPH0641046U JP H0641046 U JPH0641046 U JP H0641046U JP 7611292 U JP7611292 U JP 7611292U JP 7611292 U JP7611292 U JP 7611292U JP H0641046 U JPH0641046 U JP H0641046U
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- phosphor
- sulfide
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Abstract
(57)【要約】
【目的】 ＺｎＯ：Ｚｎ蛍光体と硫化物系蛍光体を有す
る蛍光表示管の寿命を伸ばす。
【構成】 ＺｎＯ：Ｚｎ蛍光体を有する下段の陽極１の
上方に、比較的細い８μｍの線状陰極２を張る。硫化物
系蛍光体を有する上段の陽極３，４の上方に、比較的太
い１０〜１１μｍの線状陰極５を張る。両線状陰極２，
５には共通の陰極電圧０．０５Ｖ／ｍｍを加える。陽極
３，４の硫化物系蛍光体からは硫化物系ガスが出るが、
太い線状陰極５は６２５〜６５０℃の温度になるので硫
化物による毒化は生じない。硫化物系蛍光体の陽極３，
４は常時発光させるものではないので高温による陰極の
寿命低下は問題にならない。細い方の線状陰極では６０
０℃の温度になる。この温度でＺｎＯ：Ｚｎ蛍光体の発
光には十分なエミッションが得られ、６２５〜６５０℃
の温度に比べて寿命が長くなる。
(57) [Summary] [Objective] To extend the life of a fluorescent display tube having a ZnO: Zn phosphor and a sulfide-based phosphor. [Structure] A relatively thin linear cathode 2 having a thickness of 8 μm is provided above a lower anode 1 having a ZnO: Zn phosphor. A relatively thick linear cathode 5 having a thickness of 10 to 11 μm is provided above the upper anodes 3 and 4 having the sulfide-based phosphor. Double linear cathode 2,
A common cathode voltage of 0.05 V / mm is applied to 5. Sulfide-based gas is emitted from the sulfide-based phosphors of the anodes 3 and 4,
Since the thick linear cathode 5 has a temperature of 625 to 650 ° C., poisoning by sulfide does not occur. Sulfide phosphor anode 3,
Since No. 4 does not always emit light, the reduction in the life of the cathode due to high temperature is not a problem. 60 for thin linear cathodes
It reaches a temperature of 0 ° C. At this temperature, sufficient emission was obtained for the emission of the ZnO: Zn phosphor, 625-650 ° C.
The life is longer than the temperature.
Description
【０００１】[0001]
本考案は、ＺｎＯ：Ｚｎ蛍光体を有する陽極と硫化物系蛍光体を有する陽極が 同一外囲器内に設けられた蛍光表示管に係わり、特に硫化物による陰極汚染を防 止すると共にＺｎＯ：Ｚｎ蛍光体の発光寿命を長くした蛍光表示管に関するもの である。 The present invention relates to a fluorescent display tube in which an anode having a ZnO: Zn phosphor and an anode having a sulfide-based phosphor are provided in the same envelope, and in particular, the cathode contamination by sulfide is prevented and ZnO: The present invention relates to a fluorescent display tube in which the emission lifetime of a Zn phosphor is extended.
【０００２】[0002]
多くの蛍光表示管でＺｎＯ：Ｚｎ蛍光体が使用されている。この蛍光体は抵抗 値が低く、また発光効率が高いので射突させる電子の加速電圧が低くても十分な 輝度が得られる。ＺｎＯ：Ｚｎ蛍光体のピーク波長は緑色の５０４ｎｍであり、 この蛍光体のみを用いた蛍光表示管は緑色一色の表示となる。 ZnO: Zn phosphors are used in many fluorescent display tubes. Since this phosphor has a low resistance value and high luminous efficiency, sufficient brightness can be obtained even when the accelerating voltage of electrons to be bombarded is low. The peak wavelength of the ZnO: Zn phosphor is 504 nm, which is green, and the fluorescent display tube using only this phosphor displays a single color of green.
【０００３】 近年、蛍光表示管の用途が拡大し、車のインパネにも使用されるようになった 。インパネの表示部には、スピードメータや回転計等のように常に発光表示する 部分と、水温・油温・ドア等の警告灯や方向指示灯のように必要な時のみに発光 する部分とがある。前述の警告灯類は、運転者の注意を喚起するために、緑色以 外の黄・赤・オレンジ色等の発光色で表示するのが普通である。このような緑色 以外の色彩で発光する蛍光体を一般にカラー蛍光体と称している。In recent years, the use of fluorescent display tubes has expanded, and they have come to be used in instrument panels of vehicles. On the instrument panel display, there are a part that constantly emits light, such as a speedometer and tachometer, and a part that emits light only when necessary, such as a warning light for water temperature, oil temperature, doors, etc. is there. The above-mentioned warning lights are usually displayed in emission colors other than green, such as yellow, red, and orange, in order to call the driver's attention. Such a phosphor that emits light in a color other than green is generally called a color phosphor.
【０００４】 代表的なカラー蛍光体としては（Ｚｎx Ｃｄ1-x ）Ｓ：Ａｇ，Ｃｌ蛍光体があ り、組成式中のｘ値を変えることによって黄色からオレンジ色、赤色までの発光 色が得られる。この他、カラー蛍光体としては、ＺｎＳ：Ｃｕ，Ａｌ蛍光体（黄 緑）やＺｎＳ：Ａｇ蛍光体（青）等が知られている。一般にカラー蛍光体は、先 に例示した組成式からわかるように、Ｓ成分を含む硫化物系蛍光体が多い。そし てカラー蛍光体は、前記ＺｎＯ：Ｚｎ蛍光体に比べて抵抗が高いので、Ｉｎ2 Ｏ 3 やＺｎＯ等の導電物質を混合して使用する。A typical color phosphor is (ZnxCd1-x) There is an S: Ag, Cl phosphor, and the emission colors from yellow to orange and red can be obtained by changing the x value in the composition formula. In addition, ZnS: Cu, Al phosphor (yellow green), ZnS: Ag phosphor (blue), and the like are known as color phosphors. Generally, color phosphors are often sulfide-based phosphors containing an S component, as can be seen from the composition formulas exemplified above. Since the color phosphor has a higher resistance than the ZnO: Zn phosphor,2O 3 A conductive material such as ZnO or ZnO is mixed and used.
【０００５】 蛍光表示管には、陽極に被着されたこれらの蛍光体を発光させるために、電子 源としての線状陰極が陽極に対面して張設されている。線状陰極は、ヒータであ るＷ細線の周囲にＢａ，Ｃａ，Ｓｒの酸化物を被覆したものである。Ｗ細線は、 通常５．８〜２４．４μｍの範囲で１０種類程の外径のものが用意されている。 酸化物層の被覆厚さは通常５〜６μｍであり、電着法により形成される。線状陰 極の外径は、外囲器の寸法、必要輝度、蛍光体の種類や寿命等によって決定され 、同一蛍光表示管内には同一径の線状陰極が設けられていた。In the fluorescent display tube, a linear cathode as an electron source is stretched so as to face the anode in order to emit light from these phosphors adhered to the anode. The linear cathode is formed by coating a W thin wire, which is a heater, with an oxide of Ba, Ca, Sr. The W thin wire is usually prepared in a range of 5.8 to 24.4 μm and having an outer diameter of about 10 types. The oxide layer has a coating thickness of usually 5 to 6 μm and is formed by an electrodeposition method. The outer diameter of the linear negative electrode is determined by the size of the envelope, the required brightness, the type and life of the phosphor, and the like, and the same cathode has the linear cathode of the same diameter.
【０００６】 線状陰極は、外囲器の両端に設けられた支持部に両端を溶接されている。複数 本の線状陰極が設けられている場合でも、両端の各支持部はそれぞれ共通のリー ド板に溶接されているので、全ての線状陰極には共通の陰極電圧が印加されるよ うになっていた。Both ends of the linear cathode are welded to support portions provided at both ends of the envelope. Even when multiple linear cathodes are provided, the support parts at both ends are welded to the common lead plate, so that a common cathode voltage is applied to all linear cathodes. Was becoming.
【０００７】 以上説明したように、従来はインパネ用の多くの蛍光表示管においてＺｎＯ： Ｚｎ蛍光体とカラー蛍光体が用いられていた。そして線状陰極の径は一定に揃え られて共通の陰極電圧を与えられていた。As described above, ZnO: Zn phosphors and color phosphors have been conventionally used in many fluorescent display tubes for instrument panels. The diameters of the linear cathodes were made uniform, and a common cathode voltage was applied.
【０００８】[0008]
本件発明者は実験から図２に示すデータを得た。これは、線状陰極の芯線の径 と陰極電圧と発熱温度の関係を示すものである。このデータからわかるように、 陰極電圧が同じならば、芯線の径が大きくなるほど発熱温度が高くなる。 The present inventor obtained the data shown in FIG. 2 from the experiment. This shows the relationship between the core wire diameter of the linear cathode, the cathode voltage, and the heat generation temperature. As can be seen from this data, if the cathode voltage is the same, the larger the diameter of the core wire, the higher the heat generation temperature.
【０００９】 また、線状陰極は、発熱温度が高いほど酸化物層からＢａ等の蒸発が多くなる ので、寿命が短くなると考えられる。逆に温度が低くなると、蒸発量は少なくエ ミッション量は減るが寿命は長くなると考えられる。Further, the higher the heat generation temperature of the linear cathode, the more the evaporation of Ba and the like from the oxide layer, so the life of the linear cathode is considered to be shortened. On the contrary, when the temperature is low, the amount of evaporation is small and the amount of emission is small, but the life is considered to be long.
【００１０】 ここで、蛍光体の種類と線状陰極の寿命の関係について考察する。 まずＺｎＯ：Ｚｎ蛍光体は、前述したように低抵抗であり、カラー蛍光体に比 べてエミッション量が少なくても十分な輝度が得られる。このため、ＺｎＯ：Ｚ ｎ蛍光体との関係においては、線状陰極を約６００℃程度の比較的低い温度で加 熱すれば、低エミッションで十分な蛍光体の発光輝度を得ながら、線状陰極自体 の寿命も長くすることができる。そこで従来のカラー蛍光体を含む蛍光表示管で はＺｎＯ：Ｚｎ蛍光体に合わせて、すべての線状陰極を６００℃で発熱させて使 用していた。しかしながら、本考案者は線状陰極の発熱温度とシンターの関係を 研究して次のことを知見した。Here, the relationship between the type of phosphor and the life of the linear cathode will be considered. First, the ZnO: Zn phosphor has a low resistance as described above, and sufficient brightness can be obtained even when the emission amount is smaller than that of the color phosphor. Therefore, in relation to the ZnO: Zn phosphor, if the linear cathode is heated at a relatively low temperature of about 600 ° C., linear emission is achieved while low emission and sufficient emission brightness of the phosphor are obtained. The life of the cathode itself can be extended. Therefore, in a conventional fluorescent display tube including a color phosphor, all linear cathodes are used by heating at 600 ° C. in accordance with the ZnO: Zn phosphor. However, the present inventor has studied the relationship between the exothermic temperature of the linear cathode and the sinter and found the following.
【００１１】 カラー蛍光体は電子の射突によって硫化物系のガスを発生する。このガスが線 状陰極にシンターし、酸化物を毒化して陰極の寿命を短くしてしまう。本発明者 の研究によれば、カラー蛍光体との関係においては、線状陰極を約６２５〜６５ ０℃程度の比較的高い温度に加熱してエミッションをさかんにし、硫化物汚染の 悪影響を少くすることにより、シンターを防止できることがわかった。The color phosphor emits a sulfide-based gas by electron bombardment. This gas sinters the linear cathode and poisons the oxide, shortening the life of the cathode. According to the research conducted by the present inventor, in relation to the color phosphor, the linear cathode is heated to a relatively high temperature of about 625 to 650 ° C. to suppress the emission and reduce the adverse effect of sulfide contamination. By doing so, it was found that sintering can be prevented.
【００１２】 即ち、陰極電圧を同一として考えると、ＺｎＯ：Ｚｎ蛍光体のみに関して言え ば、発熱温度の低い細い線状陰極でよいが、カラー蛍光体については発熱温度の 高い太い線状陰極が必要になる。That is, assuming that the cathode voltage is the same, a thin linear cathode with a low exothermic temperature is sufficient for ZnO: Zn phosphors only, but a thick linear cathode with a high exothermic temperature is required for color phosphors. become.
【００１３】 本考案は、ＺｎＯ：Ｚｎ蛍光体とカラー蛍光体の両方を用いている蛍光表示管 において、カラー蛍光体による線状陰極の硫化物汚染を防ぐとともに、ＺｎＯ： Ｚｎ蛍光体の表示部分にも十分な寿命をもたせるようにすることを目的としてい る。The present invention provides a fluorescent display tube using both a ZnO: Zn phosphor and a color phosphor, which prevents sulfide contamination of the linear cathode by the color phosphor and also displays the ZnO: Zn phosphor. In addition, the purpose is to have a sufficient life.
【００１４】[0014]
請求項１に係る螢光表示管は、真空外囲器の陽極基板上の陽極に被着された蛍 光体が硫化物系蛍光体を含む蛍光表示管において、前記硫化物系蛍光体に対面す る線状陰極を６２５℃以上に発熱させることを特徴としている。 The fluorescent display tube according to claim 1 is a fluorescent display tube in which a phosphor adhered to an anode on an anode substrate of a vacuum envelope includes a sulfide-based phosphor, and faces the sulfide-based phosphor. It is characterized in that the linear linear cathode is heated to 625 ° C. or higher.
【００１５】 請求項２に係る蛍光表示管は、同一真空外囲器中の陽極基板上の陽極に被着さ れた蛍光体が硫化物系蛍光体とＺｎＯ：Ｚｎ蛍光体を含む蛍光表示管において、 前記硫化物系蛍光体に対面する線状陰極が６２５℃以上に発熱し、ＺｎＯ：Ｚｎ 蛍光体に対面する線状陰極が６００℃に発熱するようにしたことを特徴としてい る。According to a second aspect of the present invention, there is provided a fluorescent display tube in which the phosphor attached to the anode on the anode substrate in the same vacuum envelope includes a sulfide-based phosphor and a ZnO: Zn phosphor. In the second aspect, the linear cathode facing the sulfide-based phosphor generates heat at 625 ° C. or higher, and the linear cathode facing the ZnO: Zn phosphor heats at 600 ° C.
【００１６】 また、請求項２に係る蛍光表示管において、各蛍光体に対面する各線状陰極に 同一の陰極電圧を印加し、硫化物系蛍光体に対面する線状陰極の直径を太くして ６２５℃以上に発熱させ、ＺｎＯ：Ｚｎ蛍光体に対面する線状陰極の直径を細く して６００℃に発熱するようにしてもよい。In the fluorescent display tube according to claim 2, the same cathode voltage is applied to each linear cathode facing each phosphor, and the diameter of the linear cathode facing the sulfide phosphor is increased. The temperature may be raised to 625 ° C. or higher and the diameter of the linear cathode facing the ZnO: Zn phosphor may be reduced to 600 ° C.
【００１７】 さらに、請求項２に係る蛍光表示管において、各蛍光体に対面する各線状陰極 の直径を同一にし、硫化物系蛍光体に対面する線状陰極には６２５℃以上に発熱 するように、またＺｎＯ：Ｚｎ蛍光体に対面する線状陰極には６００℃に発熱す るようにそれぞれ異なる電圧を印加するようにしてもよい。Further, in the fluorescent display tube according to claim 2, the diameters of the linear cathodes facing the phosphors are the same, and the linear cathodes facing the sulfide-based phosphor generate heat at 625 ° C. or more. In addition, different voltages may be applied to the linear cathode facing the ZnO: Zn phosphor so as to generate heat at 600 ° C.
【００１８】[0018]
硫化物系蛍光体の上方にある太い線状陰極又は高い陰極電圧を印加した線状陰 極は、比較的高温すなわち６２５℃以上に発熱するので硫化物による汚染が防止 される。また、ＺｎＯ：Ｚｎ蛍光体の上方にある細い線状陰極又は陰極電圧の低 い線状陰極は、比較的低温すなわち６００℃に発熱するので十分な寿命が期待で きる。 The thick linear cathode above the sulfide-based phosphor or the linear negative electrode to which a high cathode voltage is applied generates heat at a relatively high temperature, that is, at 625 ° C. or higher, so that sulfide contamination is prevented. Further, since the thin linear cathode or the linear cathode with a low cathode voltage above the ZnO: Zn phosphor generates heat at a relatively low temperature, that is, 600 ° C., a sufficient life can be expected.
【００１９】[0019]
図１は一実施例に係る車載用の蛍光表示管の要部平面図である。 ３桁の数字等によりスピードを表示する下段の陽極１には、ＺｎＯ：Ｚｎ蛍光 体が被着されている。その上方には、線径が８μｍの線状陰極２が３本設張され ている。 FIG. 1 is a plan view of a main part of a vehicle-mounted fluorescent display tube according to an embodiment. A ZnO: Zn phosphor is coated on the anode 1 in the lower stage, which displays the speed with a three-digit number or the like. Three linear cathodes 2 having a wire diameter of 8 μm are provided above it.
【００２０】 スピードの警告灯乃至方向指示灯である上段の陽極３，４には、硫化物系のカ ラー蛍光体が被着されている。その上方には、線径が１０〜１１μｍ程度の線状 陰極５が２本張設されている。Sulfide-based color phosphors are attached to the upper anodes 3 and 4 which are speed warning lights or direction indicators. Two linear cathodes 5 having a wire diameter of about 10 to 11 μm are stretched above it.
【００２１】 前述した線径の異なる二種類の線状陰極２，５に、０．０５Ｖ／ｍｍの陰極電 圧を共通に与える。下段の陽極１の上方にある比較的細い方の線状陰極２は、比 較的低い約６００℃の温度に発熱する。この温度は、この線状陰極２に対面して いる緑色発光のＺｎＯ：Ｚｎ蛍光体には最適の温度であり、発光に必要な十分な エミッションが得られるとともに線状陰極２の寿命が伸びる。このため、常時点 灯する緑色によるスピード表示部分の寿命を長くできる。A cathode voltage of 0.05 V / mm is commonly applied to the two types of linear cathodes 2 and 5 having different wire diameters. The relatively thin linear cathode 2 above the lower anode 1 generates heat at a relatively low temperature of about 600 ° C. This temperature is the optimum temperature for the green-emitting ZnO: Zn phosphor facing the linear cathode 2, and sufficient emission required for light emission is obtained and the life of the linear cathode 2 is extended. For this reason, the life of the green speed indicator, which is constantly lit, can be extended.
【００２２】 また、上段の陽極３，４の上方にある比較的太い方の線状陰極５は、比較的高 い約６２５〜６５０℃の温度に発熱する。この線状陰極５に対面しているカラー 蛍光体からは硫化物系ガスが発生するが、線状陰極５をこの程度の温度に保てば 、硫化物による線状陰極５の汚染は防止される。カラー表示部は警告灯や方向指 示灯であって常時点灯する訳ではないので、高温による寿命の低下は問題になら ない。Further, the relatively thick linear cathode 5 above the upper anodes 3 and 4 generates heat at a relatively high temperature of about 625 to 650 ° C. Sulfide-based gas is generated from the color phosphor facing the linear cathode 5, but if the linear cathode 5 is kept at this temperature, the contamination of the linear cathode 5 with sulfide can be prevented. It Since the color display is a warning light or a direction light and does not always light up, the reduction in life due to high temperature is not a problem.
【００２３】 本実施例における陰極電圧の値及び線状陰極の径は一例であり、前述した温度 を達成するには他の値も採用しうる。例えば陰極電圧を０．０４Ｖ／ｍｍとすれ ば、カラー蛍光体に対面する線状陰極の径を１２〜１５μｍ、ＺｎＯ：Ｚｎ蛍光 体に対面する線状陰極の径を１１μｍとすることができる。The value of the cathode voltage and the diameter of the linear cathode in this embodiment are examples, and other values may be adopted to achieve the above-mentioned temperature. For example, if the cathode voltage is 0.04 V / mm, the diameter of the linear cathode facing the color phosphor can be 12 to 15 μm, and the diameter of the linear cathode facing the ZnO: Zn phosphor can be 11 μm.
【００２４】 次に、第２実施例を説明する。本実施例の構成は、線状陰極の径と陰極電圧の 値以外は同じである。本実施例においては、すべての線状陰極を１６μｍに統一 してある。そして、ＺｎＯ：Ｚｎ蛍光体の上方にある線状陰極には０．０３Ｖ／ ｍｍの陰極電圧を与えて６００℃に発熱させ、カラー蛍光体の上方にある線状陰 極には０．０３５Ｖ／ｍｍの陰極電圧を与えて６２５℃に発熱させる。又は０． ０４Ｖ／ｍｍの陰極電圧を与えて６５０℃に発熱させる。このように、線状陰極 の径を同一にそろえ、対面する蛍光体の種類に応じて陰極電圧を変えても、第１ 実施例と同様な発熱温度のちがいを実現することができる。Next, a second embodiment will be described. The structure of this embodiment is the same except for the diameter of the linear cathode and the value of the cathode voltage. In this embodiment, all linear cathodes are unified to 16 μm. Then, a cathode voltage of 0.03 V / mm is applied to the linear cathode above the ZnO: Zn phosphor to generate heat at 600 ° C., and a linear cathode above the color phosphor is exposed to 0.035 V / mm. A cathode voltage of mm is applied to generate heat at 625 ° C. Or 0. A cathode voltage of 04 V / mm is applied to generate heat at 650 ° C. In this way, even if the diameters of the linear cathodes are made uniform and the cathode voltage is changed according to the type of the facing phosphor, the same difference in heat generation temperature as in the first embodiment can be realized.
【００２５】[0025]
本考案によれば、ＺｎＯ：Ｚｎ蛍光体に対面する線状陰極を細くするか又は低 い陰極電圧を与えることによって線状陰極温度を下げ、カラー蛍光体に対面する 線状陰極を太くするか又は高い陰極電圧を与えることによって線状陰極温度を上 げて硫化物による陰極汚染を防止している。このため、常時点灯する緑色発光の ＺｎＯ：Ｚｎ蛍光体の表示部分について寿命を伸ばすことができるので、蛍光表 示管全体の寿命も長くなる。 According to the present invention, the linear cathode facing the ZnO: Zn phosphor is made thin or the temperature of the linear cathode is lowered by applying a low cathode voltage, and the linear cathode facing the color phosphor is thickened. Alternatively, by applying a high cathode voltage, the temperature of the linear cathode is raised to prevent the cathode contamination by sulfide. Therefore, the life of the display portion of the green-emitting ZnO: Zn phosphor, which is constantly lit, can be extended, and the life of the entire fluorescent display tube is also extended.
【図１】一実施例の要部平面図である。FIG. 1 is a plan view of a main part of an embodiment.
【図２】陰極電圧と陰極芯線径の関係を示すグラフであ
る。FIG. 2 is a graph showing the relationship between cathode voltage and cathode core wire diameter.
１，３，４ 陽極 ２，５ 線状陰極 1,3,4 Anode 2,5 Linear cathode
Claims (4)
れた蛍光体が硫化物系蛍光体を含む蛍光表示管におい
て、前記硫化物系蛍光体に対面する線状陰極を６２５℃
以上に発熱させることを特徴とする蛍光表示管。1. In a fluorescent display tube in which a phosphor deposited on an anode on an anode substrate of a vacuum envelope includes a sulfide-based phosphor, a linear cathode facing the sulfide-based phosphor is 625 ° C.
A fluorescent display tube which is characterized by generating heat as described above.
被着された蛍光体が硫化物系蛍光体とＺｎＯ：Ｚｎ蛍光
体を含む蛍光表示管において、前記硫化物系蛍光体に対
面する線状陰極が６２５℃以上に発熱し、ＺｎＯ：Ｚｎ
蛍光体に対面する線状陰極が６００℃に発熱するように
したことを特徴とする蛍光表示管。2. A fluorescent display tube in which a phosphor deposited on an anode on an anode substrate in the same vacuum envelope includes a sulfide-based phosphor and a ZnO: Zn phosphor, wherein the sulfide-based phosphor is The facing linear cathode generates heat above 625 ° C., and ZnO: Zn
A fluorescent display tube characterized in that a linear cathode facing a phosphor is heated to 600 ° C.
蛍光体にそれぞれ対面する各線状陰極に同一の陰極電圧
が印加され、硫化物系蛍光体に対面する線状陰極の直径
を太くして６２５℃以上に発熱させ、ＺｎＯ：Ｚｎ蛍光
体に対面する線状陰極の直径を細くして６００℃に発熱
するようにした請求項２記載の蛍光表示管。3. The sulfide-based phosphor and the ZnO: Zn
The same cathode voltage is applied to each linear cathode facing the phosphor, and the diameter of the linear cathode facing the sulfide-based phosphor is increased to generate heat at 625 ° C. or higher to face the ZnO: Zn phosphor. The fluorescent display tube according to claim 2, wherein the diameter of the linear cathode is reduced to generate heat at 600 ° C.
蛍光体にそれぞれ対面する各線状陰極の直径が同一であ
り、硫化物系蛍光体に対面する線状陰極には６２５℃以
上に発熱するように、ＺｎＯ：Ｚｎ蛍光体に対面する線
状陰極には６００℃に発熱するようにそれぞれ異なる電
圧が印加される請求項２記載の蛍光表示管。4. The sulfide-based phosphor and the ZnO: Zn
The linear cathodes facing the phosphors have the same diameter, and the linear cathodes facing the sulfide-based phosphors are heated to 625 ° C. or higher. The fluorescent display tube according to claim 2, wherein different voltages are applied so as to generate heat at 600 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7611292U JPH0641046U (en) | 1992-11-04 | 1992-11-04 | Fluorescent display tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7611292U JPH0641046U (en) | 1992-11-04 | 1992-11-04 | Fluorescent display tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0641046U true JPH0641046U (en) | 1994-05-31 |
Family
ID=13595819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7611292U Pending JPH0641046U (en) | 1992-11-04 | 1992-11-04 | Fluorescent display tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0641046U (en) |
-
1992
- 1992-11-04 JP JP7611292U patent/JPH0641046U/en active Pending
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