JPH03184240A - Electron tube - Google Patents
Electron tubeInfo
- Publication number
- JPH03184240A JPH03184240A JP32141789A JP32141789A JPH03184240A JP H03184240 A JPH03184240 A JP H03184240A JP 32141789 A JP32141789 A JP 32141789A JP 32141789 A JP32141789 A JP 32141789A JP H03184240 A JPH03184240 A JP H03184240A
- Authority
- JP
- Japan
- Prior art keywords
- grid electrode
- electron tube
- cathode
- electron
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002344 surface layer Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 8
- 238000010894 electron beam technology Methods 0.000 claims description 5
- 239000000470 constituent Substances 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 abstract description 12
- 230000003213 activating effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 229940125782 compound 2 Drugs 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 9
- 238000001994 activation Methods 0.000 description 6
- 230000004913 activation Effects 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 238000010301 surface-oxidation reaction Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電子管に関し、特にカソードやゲッター等のＢ
ａを含む構成材と、グリッド電極を有する電子管に関す
る。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electron tube, and in particular, B
The present invention relates to an electron tube having a constituent material including a and a grid electrode.
電子管においては、グリッド電極表面に仕事関数を低下
させる物質が付着すると、グリッド電極からの電子放出
が生じるという問題がある。この問題に対する従来の対
策としては、電子管製造時においでカソード活性化と同
時に行われる電極加熱に用いる高周波の周波数を３５０
〜５５０ｋＨｚとすることにより、活性化時にカソード
より蒸発した炭酸塩がグリッド電極表面に付着すること
を防ぐものがあり、例えば特開昭５７−１１１７８３６
に示されている。In electron tubes, there is a problem in that when a substance that lowers the work function adheres to the surface of the grid electrode, electrons are emitted from the grid electrode. A conventional solution to this problem is to reduce the frequency of the high frequency wave used for electrode heating, which is performed simultaneously with cathode activation during electron tube manufacturing, to 350 Hz.
There are some methods that prevent carbonate evaporated from the cathode during activation from adhering to the grid electrode surface by setting the frequency to ~550kHz.
is shown.
上記従来技術では、誘導加熱のために印加する高周波の
周波数を最適化することによりカソードより蒸発した炭
酸塩がグリッド電極表面上に付着することを抑制してい
る。この処置は電子銃の動作初期段階におけるグリッド
電極からの電子放出に対するものである。しかし、実際
には、動作を続けるに従って蒸発した炭酸塩がしだいに
グリッド電極表面に蓄積されてグリッド電極表面の仕事
関数が低くなり、これらグリッド電極からの電子放出が
起こり、電子管特性が低下するという問題があった。こ
のことは、ＢａまたはＢａ化合物がグリッド電極表面に
付着した場合にも問題になる。In the above-described conventional technology, carbonate evaporated from the cathode is prevented from adhering to the surface of the grid electrode by optimizing the frequency of the high frequency applied for induction heating. This treatment is for electron emission from the grid electrode at the initial stage of operation of the electron gun. However, in reality, as the operation continues, evaporated carbonate gradually accumulates on the surface of the grid electrode, lowering the work function of the surface of the grid electrode, causing electron emission from these grid electrodes, and deteriorating the electron tube characteristics. There was a problem. This also becomes a problem when Ba or Ba compounds adhere to the surface of the grid electrode.
また、電子管内部の排気封止後に残留ガスを吸着させる
ためのゲッター剤を加熱蒸発させた場合にも、ゲッター
剤の一部がグリッド電極に付着して同様の問題が発生し
ている。Furthermore, when a getter agent for adsorbing residual gas is heated and evaporated after the electron tube is evacuated and sealed, a portion of the getter agent adheres to the grid electrode, causing a similar problem.
本発明の目的は、ＢａまたはＢａ化合物がグリッド電極
表面に付着することによる電極表面の仕事関数の低下と
、それに伴う電子放出を防ぐとともに、その後の通常の
動作時も電子放出が発生することを抑制することである
。The purpose of the present invention is to prevent a decrease in the work function of the electrode surface due to Ba or a Ba compound adhering to the surface of the grid electrode and the accompanying electron emission, and also to prevent electron emission from occurring during subsequent normal operation. It is to suppress.
上記目的は、カソードやゲッター等のＢａを含む構成材
と、ＢａまたはＢａ化合物が付着するおそれのあるグリ
ッド電極を有する電子管において、該グリッド電極の表
面にＢａまたはＢａ化合物が付着しやすい表面層を形成
することにより達成できる。The above purpose is to create a surface layer on the surface of the grid electrode to which Ba or Ba compounds are likely to adhere, in an electron tube having constituent materials containing Ba, such as a cathode or getter, and a grid electrode to which Ba or Ba compounds may adhere. This can be achieved by forming
上記表面層はグリッド電極本体金属表面よりもＢａが付
着しやすい表面層ならば、どのようなものでもよい、た
とえば、ステンレス鋼やＦｅ−Ｎｉ合金から成る電極な
らば表面酸化層を形成してもよい。上記表面酸化層を形
成するのはグリッド電極表面全面である必要はなく、電
極表面のうちカソードから放出された電子線が通過する
部分の近傍のみでも良い。上記表面酸化層を形成するに
は、成形した電極を酸素雰囲気中で加熱して熱酸化させ
たり、酸素プラズマ中に曝すことにより表面酸化させれ
ばよい。また、蒸着等によりグリッドｆｆｉ棒本体表面
にＢａまたはＢａ化合物が付着しやすい材料を付着させ
てもよい。The surface layer may be of any type as long as it is a surface layer to which Ba is more likely to adhere than the metal surface of the grid electrode body.For example, if the electrode is made of stainless steel or Fe-Ni alloy, a surface oxide layer may be formed. good. The surface oxidation layer does not need to be formed on the entire surface of the grid electrode, and may be formed only in the vicinity of the portion of the electrode surface through which the electron beam emitted from the cathode passes. In order to form the surface oxidation layer, the formed electrode may be thermally oxidized by heating in an oxygen atmosphere, or the surface may be oxidized by exposing it to oxygen plasma. Further, a material to which Ba or a Ba compound tends to adhere may be attached to the surface of the grid ffi rod body by vapor deposition or the like.
Ｂａがグリッド電極本体金属表面に付着した場合のＢａ
付着量に対するグリッド電極表面の仕事関数変化には、
Ｂａ付着量が１原子層より少ないところで極小値が存在
する。したがって、仕事関数が極小値になる量に相当す
るＢａが付着した場合にグリッド電極からの電子放出は
最も生じやすくなり、その量よりも多くても少なくても
仕事関数は高く、電子放出は生じにくくなる。Ba when Ba adheres to the metal surface of the grid electrode body
The work function change of the grid electrode surface with respect to the amount of adhesion is as follows:
A minimum value exists where the amount of Ba deposited is less than one atomic layer. Therefore, electron emission from the grid electrode is most likely to occur when Ba is deposited in an amount equivalent to the minimum value of the work function, and even if the amount is greater or less than that amount, the work function is high and electron emission does not occur. It becomes difficult.
本発明による上記表面層は、グリッド本体金属表面に比
べてＢａまたはＢａ化合物が付着しやすい。したがって
、カソードの活性化やゲッター剤を蒸発させる際に、グ
リッド電極表面は表面層が無い場合よりも速やかに１原
子層以上のＢａ付着物により覆われる。その結果、グリ
ッド電極表面は仕事関数が高い状態に保たれるようにな
り、該グリッド電極表面からの不要な電子放出を抑制す
ることができる。Ba or a Ba compound is more likely to adhere to the surface layer according to the present invention than to the metal surface of the grid body. Therefore, when activating the cathode or evaporating the getter agent, the surface of the grid electrode is more quickly covered with Ba deposits of one atomic layer or more than when there is no surface layer. As a result, the work function of the grid electrode surface is maintained in a high state, and unnecessary electron emission from the grid electrode surface can be suppressed.
以下に、本発明をブラウン管に適用した実施例について
、第１図、第２図、第３図および第４図を用いて説明す
る。An embodiment in which the present invention is applied to a cathode ray tube will be described below with reference to FIGS. 1, 2, 3, and 4.
［実施例１］
第２図は組み上げた電子銃を用いたブラウン管の概略図
である。ここでカソードとしては酸化物カソード３を用
いた。この酸化物カソード３は電子放出材料としてＢａ
化合物を含み、カソードを加熱することによりこれが分
解してＢａが蒸発する。グリッド電極はカソードに近い
方から、第１グリッド電極４．第２グリツド電極５、第
３グリッド電極６．第４グリツド電極７、第５グリツド
電極８、第６グリツド電極９の順であり、これらで構成
される電子銃から離れてシャドーマスク１０および螢光
面１１がある。ゲッター１４はゲッター剤として金属Ｂ
ａを用いており、管内を排気した後にこれを加熱してＢ
ａを蒸発させる。蒸発したＢａは内壁等に付着して管内
の残留ガスを吸収して管内真空度を向上させる。カソー
ド３を加熱することにより熱電子として放出された通常
の電子線１２は第２グリツド電極５との間の電場により
引出され、螢光面１１上に収束される。もし、カソード
やゲッターから蒸発したＢａが付着して第２グリッド電
極５表面で電子放出が生じた場合には、放出された電子
線１３は輝度信号であるカソード電位に関係なく螢光面
Ｌ１に達して無用の輝点を発生させる。[Example 1] FIG. 2 is a schematic diagram of a cathode ray tube using an assembled electron gun. Here, an oxide cathode 3 was used as the cathode. This oxide cathode 3 is made of Ba as an electron emitting material.
It contains a compound, which is decomposed by heating the cathode, and Ba evaporates. The grid electrodes are arranged in order from the one closest to the cathode: first grid electrode 4. Second grid electrode 5, third grid electrode 6. A fourth grid electrode 7, a fifth grid electrode 8, and a sixth grid electrode 9 are arranged in this order, and a shadow mask 10 and a fluorescent surface 11 are located apart from the electron gun constituted by these. Getter 14 contains metal B as a getter agent.
A is used, and after evacuating the inside of the tube, it is heated and B
Evaporate a. The evaporated Ba adheres to the inner wall, etc., absorbs residual gas inside the tube, and improves the degree of vacuum inside the tube. Ordinary electron beams 12 emitted as thermoelectrons by heating the cathode 3 are extracted by the electric field between them and the second grid electrode 5, and are focused onto the fluorescent surface 11. If Ba evaporated from the cathode or getter adheres and electron emission occurs on the surface of the second grid electrode 5, the emitted electron beam 13 will be directed to the fluorescent surface L1 regardless of the cathode potential, which is a brightness signal. It reaches out and creates a useless bright spot.
第１図は本発明の実施例の一つである表面酸化ステンレ
ス鋼グリッド電極の孔の近傍の断面図である。この電極
は第２図に示したブラウン管に用いる電子銃の第２グリ
ツド電極５であり、Ｎｉ。FIG. 1 is a cross-sectional view of the vicinity of the holes of a surface-oxidized stainless steel grid electrode, which is one of the embodiments of the present invention. This electrode is the second grid electrode 5 of the electron gun used in the cathode ray tube shown in FIG. 2, and is made of Ni.
Ｃｒ、Ｍｏを含むステンレス鋼でできているグリッド電
極本体１の表面を酸化させて表面酸化層２を形成したも
のである。この表面酸化層２はプレス成形のすんだ電極
を１Ｏ−３Ｐａ程度の酸素雰囲気中ニて８００℃にて３
０分間加熱することにより形成した。形成された表面酸
化層をイオンマイクロアナライザ（ＩＭＡ）により深さ
方向に組成分析したところ酸化層の厚さは約２００ｎｍ
であった。第１図に示した第２グリツド電極５同様に。A surface oxide layer 2 is formed by oxidizing the surface of a grid electrode body 1 made of stainless steel containing Cr and Mo. This surface oxidation layer 2 is formed by heating the press-molded electrode at 800°C in an oxygen atmosphere of about 1O-3Pa.
It was formed by heating for 0 minutes. The composition of the formed surface oxide layer was analyzed in the depth direction using an ion microanalyzer (IMA), and the thickness of the oxide layer was approximately 200 nm.
Met. Similarly to the second grid electrode 5 shown in FIG.
第１グリツド電極にも酸化層を形成した電極を用いて電
子銃として組み上げた。The first grid electrode was also assembled into an electron gun using an electrode with an oxide layer formed thereon.
この電子銃を用いて第２図に示したブラウン管を作製し
、螢光面電位を３０ｋＶ、第１グリッド電極４電位をＯ
ｖ、第２グリツド電極電位を１ｋＶに設定して試験を行
った。その結果、カソードの活性化が終了するまでの間
には無用の輝点が認められ第２グリツド電極５がらの電
子放出が生じていたが、活性化終了後の状態では電子放
出は見られず、その後の約５０００時間までの動作の間
にもグリッド電極からの電子放出は認められなかった。Using this electron gun, a cathode ray tube as shown in Fig. 2 was fabricated, the potential of the fluorescent surface was set to 30 kV, and the potential of the first grid electrode 4 was set to O.
v. The test was conducted with the second grid electrode potential set at 1 kV. As a result, unnecessary bright spots were observed and electron emission from the second grid electrode 5 occurred until the activation of the cathode was completed, but no electron emission was observed after the activation was completed. , no electron emission from the grid electrode was observed during the subsequent operation up to about 5000 hours.
［実施例２］
第３図は本発明の実施例２の表面酸化Ｆｅ−Ｎｉグリッ
ド電極の断面図である。このグリッド電極本体１５はＦ
ｅおよびＮｉでできており、プレス成型した後に大気中
４００℃にて１０分間加熱することにより表面酸化層１
６を形成した。この時、形成された表面酸化層１６の厚
さは約５００ｎｍであった。このグリッド電極を実施例
１と同様に、第２図に示したブラウン管の第１グリツド
電極および第２グリツド電極に用いて電子銃を構成した
ところ、実施例１と同様の効果が得られた。[Example 2] FIG. 3 is a cross-sectional view of a surface-oxidized Fe--Ni grid electrode according to Example 2 of the present invention. This grid electrode body 15 is F
The surface oxide layer 1 is formed by heating at 400°C in the air for 10 minutes after press molding.
6 was formed. At this time, the thickness of the surface oxidized layer 16 formed was about 500 nm. When this grid electrode was used as the first grid electrode and the second grid electrode of the cathode ray tube shown in FIG. 2 in the same manner as in Example 1 to construct an electron gun, the same effects as in Example 1 were obtained.
［実施例３］
第４図は本発明の実施例３の酸化物被覆グリッド電極の
孔の近傍の断面図である。このグリッド電極本体１７は
実施例２と同様にＦｅおよびＮｉでできている。プレス
成形したグリッド電極本体を１０−’Ｐａ程度の真空中
において７００℃に加熱して脱ガス処理を施した後、表
面上に酸化アルミニウム膜１８を約５００ｎｍの膜厚で
形成した。[Example 3] FIG. 4 is a cross-sectional view of the vicinity of the holes of an oxide-coated grid electrode according to Example 3 of the present invention. This grid electrode body 17 is made of Fe and Ni as in the second embodiment. After degassing the press-molded grid electrode body by heating it to 700°C in a vacuum of about 10-'Pa, an aluminum oxide film 18 with a thickness of about 500 nm was formed on the surface.
これを実施例１に示した表面酸化グリッド電極と同様に
第２図に示したようなブラウン管に組み込み、同一条件
で試験を行なった。結果は上記表面酸化グリッド電極と
同様であった。つまり、カソードの活性化の段階におい
てはグリッド電極からの電子放出が認められたものの、
その後においては電子放出はみられず、その後の長時間
動作の間にも電極からの電子放出は認められなかった。This was incorporated into a cathode ray tube as shown in FIG. 2 in the same manner as the surface oxidized grid electrode shown in Example 1, and a test was conducted under the same conditions. The results were similar to those of the surface oxidized grid electrode described above. In other words, although electron emission from the grid electrode was observed at the stage of cathode activation,
After that, no electron emission was observed, and no electron emission from the electrode was observed during the subsequent long-term operation.
また、酸化物被覆膜としてＭｇの酸化物膜を形成した場
合についても同様の効果が得られた。Furthermore, similar effects were obtained when an Mg oxide film was formed as the oxide coating film.
本発明を用いることにより、グリッド電極表面はＢａま
たはＢａ化合物が付着しゃすい状態になる。その結果、
カソード活性化過程程度の動作初期段階のうちに、仕事
関数が最低となる付着量をこえる量のＢａまたはＢａ化
合物によりグリッド電極表面は被覆される。したがって
、グリッド電極表面は仕事関数が高い状態となるととも
に、さらにＢａやＢａ化合物が付着しても仕事関数が低
下することはなく、電子銃動作時に新たにグリッド電極
からの電子放出が発生することを防ぐことができる。By using the present invention, Ba or a Ba compound is easily attached to the surface of the grid electrode. the result,
During the initial stage of operation, such as the cathode activation process, the surface of the grid electrode is coated with Ba or a Ba compound in an amount that exceeds the amount of deposition at which the work function is the lowest. Therefore, the work function of the grid electrode surface is high, and even if Ba or Ba compounds are attached, the work function does not decrease, and new electron emission from the grid electrode occurs during electron gun operation. can be prevented.
グリッド電極からの電子放出が生じにくくなることによ
り、陽極電圧を高くしたり、電極間隔を狭くすることが
できる。これにより、高輝度・高精細のブラウン管や高
出力の送信管を得ることができるようになる。Since electron emission from the grid electrode is less likely to occur, the anode voltage can be increased and the electrode spacing can be narrowed. This makes it possible to obtain high-brightness, high-definition cathode ray tubes and high-output transmitting tubes.
第１図は表面酸化ステンレス鋼グリッド電極の断面図、
第２図はブラウン管の電極構成図、第３図は表面酸化Ｆ
ｅ −Ｎ ｉグリッド電極の断面図、第４図は酸化物
薄膜被覆グリッド電極の断面図である。
１・・・ステンレス鋼グリッド電極本体、２・・・表面
酸化層、３・・・酸化物カソード、４・・・第１グリツ
ド電極、５・・・第２グリツド電極、６・・・第３グリ
ッド電極、７・・・第４グリツド電極、８・・・第５グ
リツド電極、９・・・第６グリツド電極、１０−・・シ
ャドーマスク、１１・・・螢光面、１２・・・通幇の電
子線、１３・・・第２グリツド電極より放出された電子
線、１４・・・ゲッター、１５・・・Ｆｅ−Ｎｉグリッ
ド電極本体、１６・・・表面酸化層、１７・・・Ｆｅ−
Ｎｉグリッド電極本体−
■８・・・酸化アルミニウム嘩７
・・ゲッター
第１図
第２図
第３図
第４図Figure 1 is a cross-sectional view of a surface oxidized stainless steel grid electrode.
Figure 2 is a diagram of the cathode ray tube electrode configuration, and Figure 3 is the surface oxidized F.
A cross-sectional view of the e-Ni grid electrode, and FIG. 4 is a cross-sectional view of the grid electrode coated with an oxide thin film. DESCRIPTION OF SYMBOLS 1... Stainless steel grid electrode body, 2... Surface oxidation layer, 3... Oxide cathode, 4... First grid electrode, 5... Second grid electrode, 6... Third Grid electrode, 7...Fourth grid electrode, 8...Fifth grid electrode, 9...Sixth grid electrode, 10--Shadow mask, 11--Fluorescent surface, 12--Thread 13... Electron beam emitted from the second grid electrode, 14... Getter, 15... Fe-Ni grid electrode body, 16... Surface oxidation layer, 17... Fe −
Ni grid electrode body - ■8... Aluminum oxide layer 7... Getter Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
て、上記電子管はＢａを含む構成材を含み、上記グリッ
ド電極の少なくとも１つは上記カソードから放出される
電子線が通過する部分の近傍部に表面層が被覆されてお
り、かつ該表面層は上記グリッド電極本体金属よりＢａ
が付着しやすい材料からなることを特徴とする電子管。 ２、上記表面層の被覆が上記グリッド電極全体になされ
ている特許請求の範囲第１項記載の電子管。 ３、上記Ｂａを含む構成材が上記カソードである特許請
求の範囲第１項または第２項記載の電子管。 ４、上記Ｂａを含む構成材が上記電子管内に封入される
ゲツターである特許請求の範囲第１項または第２項記載
の電子管。 ５、上記表面層がＦｅ、Ｎｉ、Ｃｒ、Ｍｏ、Ａｌ、Ｍｇ
のうちの少なくとも１つの元素を含む酸化物である特許
請求の範囲第１項、第２項、第３項または第４項記載の
電子管。 ６、上記表面層は上記グリッド電極本体表面に表面層材
料を付着さることにより形成されたものである特許請求
の範囲第５項記載の電子管。 ７、上記電子管はブラウン管である特許請求の範囲第５
項または第６項記載の電子管。[Claims] 1. An electron tube having a cathode and a grid electrode, wherein the electron tube includes a constituent material containing Ba, and at least one of the grid electrodes is located near a portion through which an electron beam emitted from the cathode passes. The part is covered with a surface layer, and the surface layer has a Ba
An electron tube characterized in that it is made of a material to which it easily adheres. 2. The electron tube according to claim 1, wherein the entire grid electrode is covered with the surface layer. 3. The electron tube according to claim 1 or 2, wherein the component containing Ba is the cathode. 4. The electron tube according to claim 1 or 2, wherein the constituent material containing Ba is a getter sealed within the electron tube. 5. The surface layer is Fe, Ni, Cr, Mo, Al, Mg
The electron tube according to claim 1, 2, 3, or 4, which is an oxide containing at least one element of the following. 6. The electron tube according to claim 5, wherein the surface layer is formed by attaching a surface layer material to the surface of the grid electrode body. 7. Claim 5, wherein the electron tube is a cathode ray tube.
The electron tube according to item 6 or item 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32141789A JPH03184240A (en) | 1989-12-13 | 1989-12-13 | Electron tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32141789A JPH03184240A (en) | 1989-12-13 | 1989-12-13 | Electron tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03184240A true JPH03184240A (en) | 1991-08-12 |
Family
ID=18132316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32141789A Pending JPH03184240A (en) | 1989-12-13 | 1989-12-13 | Electron tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03184240A (en) |
-
1989
- 1989-12-13 JP JP32141789A patent/JPH03184240A/en active Pending
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