JPH0787068B2 - Linear hot cathode - Google Patents
Linear hot cathodeInfo
- Publication number
- JPH0787068B2 JPH0787068B2 JP12205387A JP12205387A JPH0787068B2 JP H0787068 B2 JPH0787068 B2 JP H0787068B2 JP 12205387 A JP12205387 A JP 12205387A JP 12205387 A JP12205387 A JP 12205387A JP H0787068 B2 JPH0787068 B2 JP H0787068B2
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- earth metal
- metal oxide
- bao
- weight
- 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 - Fee Related
Links
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Solid Thermionic Cathode (AREA)
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。TECHNICAL FIELD 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 utilizing a linear hot cathode have been conventionally proposed,
For example, there is a flat panel display device as shown in FIG. 4 (Japanese Patent Laid-Open No. 60-84744).
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，、下方向に所要の間隔を隔てて配設して構成してあ
る。FIG. 4 is a schematic cross-sectional view showing a conventional flat-panel display device. This display device is passed over a plurality of metal locking portions 2 provided on an insulating substrate 1 at regular intervals, and at predetermined intervals. The cathode wire 3 having the cathode 4b formed thereon is stretched by holding the electron emitting material, and the control electrode 5 is arranged on the insulating substrate 1 corresponding to each cathode 4b. Grid electrode 6 having through holes 6a at positions corresponding to the respective cathodes 4b
Further, above the grid electrode 6, anodes 8 coated with the phosphors 7 are arranged at positions corresponding to the cathodes 4b above and below the grid electrodes 6 at predetermined intervals. .
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）C03〕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〕に変換して形成してある。
なお、この際に陰極ワイヤー３のタングステンとの以下
のような反応で電子放射物質中のBaOが還元されて過剰B
aを生成するが、このBaは拡散時に陰極表面へ移動し、B
aO中でドナーを形成し、エミッションに寄与する。The cathode wire 3 is made of tungsten, and the cathode
For 4b, a ternary carbonate [(Ba, Sr, Ca) C0 3 ] of barium, strontium, and calcium is attached to the surface of the cathode wire 3 by an electrodeposition method or a coating method, and the inside of the display device container is evacuated to a vacuum. In the process of heating, it is decomposed by heating, and the carbonate is converted into an oxide [(Ba, Sr, Ca) 0].
At this time, BaO in the electron emitting substance is reduced by the following reaction with the tungsten of the cathode wire 3 and excess B is generated.
A is generated, but this Ba moves to the cathode surface during diffusion, and B
It forms a donor in aO and contributes to emission.
6BaO＋Ｗ→Ba3WO6＋3Ba（反応式１） 次に動作について説明する。陰極ワイヤー３をその両端
に給電して約700℃に加熱すると陰極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。一方制御電
極５に負の電圧を印加すると陰極4b周辺の電界が陰極4b
に対して負となり、陰極4bからの電子放射を停止せしめ
得るから、例えば制御電極５に正のパルス電圧を印加す
ることにより電子ビームの放射を制御できることとな
る。6BaO + W → Ba 3 WO 6 + 3Ba (Reaction formula 1) Next, the operation will be described. When the cathode wire 3 is fed to both ends and heated to about 700 ° C., 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 is guided to the phosphor 7 through the through hole 6a and excites the phosphor 7. On the other hand, when a negative voltage is applied to the control electrode 5, the electric field around the cathode 4b is changed to the cathode 4b.
However, since the electron emission from the cathode 4b can be stopped, the emission of the electron beam can be controlled by applying a positive pulse voltage to the control electrode 5, for example.
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響により、初
期エミッション電流が低くなり、表示装置の輝度が低く
なったり、表示装置の製造排気工程に長時間を要するな
どの問題点があった。By the way, as described above, the conventional linear hot cathode is a phosphor during the process of changing carbonate to oxide or during the initial operation of the display device.
7. Due to the influence of the impure gas emitted from the locking part 2, etc., there are problems that the initial emission current becomes low, the brightness of the display device becomes low, and it takes a long time to exhaust the manufacturing process of the display device. It was
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、表示装置の輝
度を高くする効果が得られ、また製造工程の短縮化，簡
略化が図れる線状熱陰極を提供することを目的とする。The present invention has been made to solve the above problems, and has a high initial emission current, an effect of increasing the brightness of a display device, and a linear shape that can shorten and simplify the manufacturing process. The purpose is to provide a hot cathode.
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 metal oxide containing barium oxide, and the weight ratio of barium oxide to the rare earth metal oxide. The electron-emitting substance having a value of 0.4 to 60 is held on a linear heat-resistant metal surface.
この発明における線状熱陰極はタングステンとBaOとの
反応に加えて、電子放射物質中の希土類金属酸化物の一
部が耐熱性金属と反応し、その結果過剰Baを生成するの
で、従来の線状熱陰極よりも初期エミッション電流が増
加する。特に、電子放射物質中のBaOと希土類金属酸化
物との混合比を規制することにより、酸素ガスなどの不
純ガスによるエミッション低下が極めて少ない。In addition to the reaction between tungsten and BaO, the linear hot cathode in the present invention causes a part of the rare earth metal oxide in the electron emitting material to react with the refractory metal, resulting in the formation of excess Ba. The initial emission current is higher than that of the hot cathode. In particular, by regulating the mixing ratio of BaO and rare earth metal oxide in the electron emitting substance, the emission reduction due to the impure gas such as oxygen gas is extremely 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
として金属製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耐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隔で
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 cross-sectional view showing a main part of a display device using a linear hot cathode according to an embodiment of the present invention, in which 1 is an insulating substrate composed of a glass plate, a ceramic plate or the like, 2 Is a locking portion mainly formed as a metal protrusion or rib, 3 is a cathode wire made of a heat-resistant metal such as tungsten, 4a is a cathode formed on the cathode wire 3 at a predetermined interval in the longitudinal direction, 5 Is a control electrode, 6 is a grid electrode, 8
Indicate the anodes, respectively.
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が相隣する係止部2,2間に位置するよう張
架し、絶縁性基板１上には前記各陰極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
は前記陰極4a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てある。A plurality of locking portions 2 are provided on the insulating substrate 1 at regular intervals, and a cathode wire 3 is provided in a manner to be passed to each locking portion 2, and a cathode 4a formed on the cathode wire 3 is provided between the locking portions 2 and 2 adjacent to each other. The control electrode 5 is arranged on the insulating substrate 1 at a position facing the cathodes 4a, and the control electrode 5 is provided above the cathode wire 3 at a position facing the cathodes 4a. A grid electrode 6 having holes 6a is formed, and an anode 8 provided with a phosphor 7 is disposed on the grid electrode 6 at a position facing the cathode 4a, and the anodes 8 are arranged at predetermined intervals in the vertical direction.
このような構成は陰極4aを除き前記第４図に示した従来
品と実質的に同じである。Such a structure is substantially the same as the conventional product shown in FIG. 4 except for the cathode 4a.
そして本発明に係る実施例の陰極4a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
を含むアルカリ土類金属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バリウムの重量比を0.4
〜35、望ましくは0.7〜30とした電子放射物質を用い
る。And the cathode 4a of the embodiment according to the present invention contains 0.2 to 20% by weight.
Consisting of a mixture of a rare earth metal oxide of and a balance of an alkaline earth metal oxide containing at least barium oxide,
The weight ratio of barium oxide to rare earth metal oxide is 0.4.
˜35, preferably 0.7˜30, is used.
なお前記希土類金属酸化物としてはSc2O3,Y2O3,Gd2O3等
が用いられ、例えばY2O3にあっては重量比BaO/Y2O3を0.
9〜33に、またGd2O3にあっては重量比BaO/Gd2O3を1.2〜
35に設定するのが望ましい。As the rare earth metal oxide, Sc 2 O 3 , Y 2 O 3 , Gd 2 O 3 or the like is used.For example, in Y 2 O 3 , the weight ratio BaO / Y 2 O 3 is 0.
9 to 33, and in the case of Gd 2 O 3 , the weight ratio BaO / Gd 2 O 3 is 1.2 to
It is recommended to set to 35.
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とするのは次の理由による。The weight ratio of barium oxide to rare earth metal oxide is 0.4.
The reason for setting ~ 60 is as follows.
即ち、CaOとSrOとの和が36重量％、またBaOとSc2O3との
和が64重量％（Sc2O3に対するBaOの重量比は10とした）
になるよう重量比を変化させて、Sc2（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。That is, the sum of CaO and SrO is 36% by weight, and the sum of BaO and Sc 2 O 3 is 64% by weight (the weight ratio of BaO to Sc 2 O 3 is 10).
By changing the weight ratio so that the content of Sc 2 (CO 3 ) 3 is different, multiple electrodeposition solutions were prepared. Based on the same electrodeposition method as before, almost the same film thickness as before was obtained. (8 μm) was used to hold the electron emitting substance on the cathode wire 3 to form each cathode.
これを表示装置の排気過程において加熱し、（Ba,Sr,C
a）CO3−Sc2（CO3）3を（Ba,Sr,Ca）Ｏ−Sc2O3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。This is heated in the exhaust process of the display device, and (Ba, Sr, C
a) CO 3 —Sc 2 (CO 3 ) 3 was changed to (Ba, Sr, Ca) O—Sc 2 O 3 to prepare display devices having cathodes having different composition ratios.
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。なお従来品にあってはBaO:64重量％、SrO:32重量
％、CaO:4重量％とした電子放射物質を用いて陰極を形
成した。その結果を第２図に示す。第２図に示すグラフ
は横軸にBaO,SrO,CaO,Sc2O3を含む混合物中のSc2O3に対
するBaOの重量比をとり、また縦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、Sc2O3
に対するBaOの重量比が0.4〜60の範囲内ではパルスエミ
ッション電流の増加傾向が顕著であり、特に重量比が0.
7〜30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 operating each display device for 2 hours, the pulse emission current value was measured when the filament current was kept constant. In addition, in the conventional product, the cathode was formed using an electron emitting material containing BaO: 64% by weight, SrO: 32% by weight, and CaO: 4% by weight. The results are shown in FIG. In the graph shown in Fig. 2, the horizontal axis shows the weight ratio of BaO to Sc 2 O 3 in the mixture containing BaO, SrO, CaO, Sc 2 O 3 , and the vertical axis shows the pulse emission current value of the conventional product. The relative current value when 100 is shown. As you can see from this graph, Sc 2 O 3
When the weight ratio of BaO to is within the range of 0.4 to 60, the increasing tendency of the pulse emission current is remarkable, and the weight ratio is particularly 0.
It can be seen that a high pulse emission current can be obtained in the range of 7 to 30.
次に上述の如くして得た本発明の実施例である陰極及び
従来品を超高真空装置内に配置し、O2ガスを導入して10
-8Torrに設定し、酸素導入前、及び酸素導入５分後にお
けるパルスエミッション電流を検出した。Next, the cathode according to the embodiment of the present invention and the conventional product obtained as described above were placed in an ultra-high vacuum apparatus, and O 2 gas was introduced.
-8 Torr was set, and the pulse emission current was detected before oxygen introduction and 5 minutes after oxygen introduction.
結果は第３図に示すとおりである。第３図に示すグラフ
は横軸にBaO＋Sc2O3の重量％を、また縦軸にパルスエミ
ッション電流値（O2導入前の電流値を100としたときのO
2導入５分後の電流値の相対値）をとって示してある。
このグラフから明らかなように従来品ではパルスエミッ
ション電流値が45であるのに対し、本発明の実施例では
BaO＋Sc2O3の和が60重量％のときのパルスエミッション
電流値は55、また和が75重量％以上ではパルスエミッシ
ョン電流値は70が得られており、不純ガス存在下でのエ
ミッション特性が著しく向上していることが解る。即
ち、BaO/Sc2O3が0.4〜60の範囲内であれば、BaOとタン
グステン、Sc2O3とタングステンとの反応による過剰Ba
の生成が十分に行われ、且つ過剰Baの一部がSc2O3上に
吸着して、陰極表面からの過剰Baの蒸発が抑制されるの
で高いパルスエミッション値が得られ、特に〔BaO＋Sc2
O3〕が40重量％以上では不純ガス存在下でもエミッショ
ン性能が極めて良好な特性を有すると考えられる。The results are shown in Fig. 3. In the graph shown in FIG. 3, the horizontal axis represents the weight% of BaO + Sc 2 O 3 and the vertical axis represents the pulse emission current value (O when the current value before introducing O 2 is 100).
2 Relative value of current value 5 minutes after introduction).
As is clear from this graph, the pulse emission current value is 45 in the conventional product, whereas in the embodiment of the present invention,
When the sum of BaO + Sc 2 O 3 is 60% by weight, the pulse emission current value is 55, and when the sum is 75% by weight or more, the pulse emission current value is 70, and the emission characteristics in the presence of impure gas are remarkable. You can see that it is improving. That is, if BaO / Sc 2 O 3 is in the range of 0.4 to 60, excess Ba due to the reaction between BaO and tungsten, and Sc 2 O 3 and tungsten.
Is sufficiently generated, and a part of excess Ba is adsorbed on Sc 2 O 3 , and evaporation of excess Ba from the cathode surface is suppressed, so that a high pulse emission value is obtained, and particularly [BaO + Sc 2
If O 3 ] is 40% by weight or more, it is considered that the emission performance is extremely good even in the presence of an impure gas.
この結果、実施例では表示装置の初期輝度が高いことは
勿論、表示装置の製造中の排気工程の短縮化，装置の低
廉化なども可能になるなどの効果を有する。As a result, in the embodiment, not only the initial brightness of the display device is high, but also the exhaust process during manufacturing of the display device can be shortened, and the cost of the device can be reduced.
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。Further, when the value of the current flowing through the cathode wire 3 is increased to achieve high brightness, it has a remarkable effect particularly in improving the life characteristics.
なお上述した実施例では線状耐熱性金属としてタングス
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
れるものではなく、主成分がMo,Taなどの場合も同様の
効果が得られる。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、板
状、コイル状、スパイラル状など任意の線状陰極形状で
も上記した効果はえられる。更に実施例は平板型表示装
置に適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、蛍光ランプにも適用
し得ることは勿論である。In the above-mentioned embodiment, the case where the tungsten wire is used as the linear heat resistant metal has been described, but the present invention is not limited to this, and similar effects can be obtained when the main component is Mo, Ta or the like. Further, the shape of the cathode is shown as a linear shape in the embodiments, but the shape is not limited to this, and any linear cathode shape such as a plate shape, a coil shape, or a spiral shape can achieve the above effects. Furthermore, although the embodiments have been described in the case of being applied to a flat panel display device, it is needless to say that the embodiments can be applied to a fluorescent display tube, a CRT using a linear hot cathode, an electron microscope, and a fluorescent lamp.
以上の如く本発明に係る線状熱陰極にあっては、希土類
金属酸化物を0.2〜20重量％、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としたから、希土類
金属酸化物の一部が耐熱性金属と反応し、過剰Baを生成
することによる初期エミッション電流の増加が得られ、
また過剰Baの一部が希土類金属酸化物の表面に吸着して
過剰Baの陰極表面からの蒸発を抑制し、酸素ガス等の不
純物によるエミッションの低下を極めて小さく出来て優
れた寿命特性が得られる等、本発明は優れた効果を奏す
る。As described above, in the linear hot cathode according to the present invention, the rare earth metal oxide is 0.2 to 20% by weight, and the weight ratio of barium oxide to the rare earth metal oxide is 0.4 to 60. An increase in the initial emission current is obtained due to the formation of excess Ba, part of which reacts with the refractory metal,
In addition, part of excess Ba is adsorbed on the surface of the rare earth metal oxide to suppress evaporation of excess Ba from the cathode surface, and the reduction of emission due to impurities such as oxygen gas can be made extremely small, resulting in excellent life characteristics. Etc., the present invention has excellent effects.
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Sc2O3に対するBaOの重量比とパルスエミッション
電流値との関係を示す特性図、第３図はBaOとSc2O3との
和の重量％と酸素ガス導入５分後のパルスエミッション
電流値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。 １……絶縁性基板、２……係止部、３……陰極ワイヤ
ー、4a……陰極、５……制御電極、６……グリッド電
極、７……蛍光体、８……アノード なお、図中、同一符号は同一、又は相当部分を示す。FIG. 1 is a schematic cross-sectional view of a display device using the product of the present invention, FIG. 2 is a characteristic diagram showing the relation between the weight ratio of BaO to Sc 2 O 3 and the pulse emission current value, and FIG. Fig. 4 is a characteristic diagram showing the relationship between the weight% of the sum of Sc 2 O 3 and the pulse emission current value 5 minutes after the introduction of oxygen gas, and Fig. 4 is a schematic sectional view showing a conventional display device. 1 ... Insulating substrate, 2 ... Locking part, 3 ... Cathode wire, 4a ... Cathode, 5 ... Control electrode, 6 ... Grid electrode, 7 ... Phosphor, 8 ... Anode The same reference numerals indicate the same or corresponding parts.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 量 神奈川県鎌倉市大船２丁目14番40号 三菱 電機株式会社商品研究所内 (72)発明者 渡部 勁二 神奈川県鎌倉市大船２丁目14番40号 三菱 電機株式会社商品研究所内 (56)参考文献 特開 昭60−84744（ＪＰ，Ａ) 特開 昭49−12758（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Suzuki 2-14-40 Ofuna, Kamakura-shi, Kanagawa Mitsubishi Electric Corporation Product Research Laboratory (72) Inventor Keiji Watanabe 2-14-40 Ofuna, Kamakura-shi, Kanagawa No. Mitsubishi Electric Corp. Product Research Laboratory (56) References JP-A-60-84744 (JP, A) JP-A-49-12758 (JP, A)
Claims (1)
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0.4〜35とした電子放射物質を、主成分がタ
ングステン，モリブデン又はタンタルから選ばれた一種
の耐熱性金属上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, wherein the weight ratio of barium oxide to the rare earth metal oxide is 0.4 to 35. A linear hot cathode, characterized in that the electron emitting material is held on a kind of heat-resistant metal whose main component is selected from tungsten, molybdenum or tantalum.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12205387A JPH0787068B2 (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 |
|---|---|---|---|
| JP12205387A JPH0787068B2 (en) | 1987-05-18 | 1987-05-18 | Linear hot cathode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63285837A JPS63285837A (en) | 1988-11-22 |
| JPH0787068B2 true JPH0787068B2 (en) | 1995-09-20 |
Family
ID=14826447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12205387A Expired - Fee Related JPH0787068B2 (en) | 1986-10-07 | 1987-05-18 | Linear hot cathode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0787068B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52312B2 (en) * | 1971-09-03 | 1977-01-06 | ||
| JPS555661B2 (en) * | 1972-05-12 | 1980-02-08 | ||
| JPS6084744A (en) * | 1983-10-15 | 1985-05-14 | Matsushita Electric Ind Co Ltd | Hot cathode |
-
1987
- 1987-05-18 JP JP12205387A patent/JPH0787068B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63285837A (en) | 1988-11-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2686274A (en) | Thermionic cathode | |
| US4897574A (en) | Hot cathode in wire form | |
| US2959702A (en) | Lamp and mount | |
| JPH0787068B2 (en) | Linear hot cathode | |
| JP2599910B2 (en) | Linear oxide cathode for cathode ray tubes | |
| JPH0785395B2 (en) | Linear hot cathode | |
| JP2928155B2 (en) | Cathode for electron tube | |
| US6545397B2 (en) | Cathode for electron tube | |
| JPH04206325A (en) | Linear hot cathode | |
| JPH01124926A (en) | Oxide cathode | |
| JP3879298B2 (en) | Field emission display | |
| KR100200664B1 (en) | Cathode for electron tube | |
| JPH0355734A (en) | Linear hot cathode | |
| US2831137A (en) | Cathode coating | |
| KR100331059B1 (en) | Method for lighting the surface of Field Emission Display Device | |
| JPH0355736A (en) | Linear hot cathode | |
| JPH0393125A (en) | Linear thermal cathode | |
| JPH07122177A (en) | Oxide cathode | |
| JPH0765692A (en) | Oxide cathode for electron tube | |
| JPH0355735A (en) | Linear for cathode | |
| JP3076649B2 (en) | Cold cathode fluorescent lamp | |
| JP2620580B2 (en) | Cathode for electron tube | |
| JP2001357770A (en) | Negative electrode of cathode-ray tube and its alloy | |
| US7208864B2 (en) | Oxide cathode for electron gun with a differentially doped metallic substrate | |
| JPH0778548A (en) | Direct heat type oxide negative electrode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |