JPS62145621A - Impregnated cathode - Google Patents
Impregnated cathodeInfo
- Publication number
- JPS62145621A JPS62145621A JP60285545A JP28554585A JPS62145621A JP S62145621 A JPS62145621 A JP S62145621A JP 60285545 A JP60285545 A JP 60285545A JP 28554585 A JP28554585 A JP 28554585A JP S62145621 A JPS62145621 A JP S62145621A
- Authority
- JP
- Japan
- Prior art keywords
- electron
- tungsten
- cup
- impregnated
- emitting material
- 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
Landscapes
- Solid Thermionic Cathode (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、含浸形陰極の信頼性を向上させた、特に形状
、寸法の高い精度を必要とする、陰極線管などに好適な
含浸形陰極に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an impregnated cathode that has improved reliability and is suitable for cathode ray tubes, etc., which particularly requires high precision in shape and dimensions. .
電子放出材料を含浸させたタングステンの多孔質焼結体
を高温に加熱して、電子放出用陰極として用いる含浸形
陰極は、高い電子流密度で長期間使用できる陰極として
、近年、高精細度陰極線管などに好適な電子ビーム放出
源としてあらためて注目されだした。Impregnated cathodes, which are made by heating a porous sintered body of tungsten impregnated with an electron-emitting material to high temperatures and are used as electron-emitting cathodes, have recently been used as cathodes for high-definition cathode rays as cathodes that can be used for long periods of time with high electron current density. It has started to attract renewed attention as an electron beam emission source suitable for tubes, etc.
含浸形陰極が提案されてから既に久しく、大電流を高密
度で長期間放出し続けることの出来る陰極として有望視
されながら、実用に供された例が余り多くないのは、主
として量産性に問題があったからである。同じ設計によ
って量産した製品の中のあるものは極めて良好な期待通
りの特性を示したのに対し、同じロフトの製品の中に、
特徴として期待された高電流密度、長寿命の点で全く問
題にならないような製品も少なからず含まれているとい
うような状態を改善するために、多くの改良方式が提案
されて来たが、未だに量産性の点で問題が多い。It has been a long time since impregnated cathodes were proposed, and although they are seen as promising as cathodes that can continue to emit large currents at high density for long periods of time, the reason why there are not many examples of them being put into practical use is mainly due to problems with mass production. This is because there was Some of the mass-produced products with the same design showed extremely good expected characteristics, while some of the products with the same loft showed
In order to improve the situation, many improvement methods have been proposed to improve the situation, as there are quite a few products that have no problems at all in terms of high current density and long life, which were expected as characteristics. There are still many problems in terms of mass production.
従来の含浸形陰極の一例では、第２図に側断面図を示す
ように、タングステンの多孔質焼結体に、Ｂ ａ ＯＸ
Ｃａ Ｏ，、Ａ １２ｘ０３などよりなる電子放出材料
を含浸させた所謂ペレット１を、電子放出面以外を被覆
する浅い円筒状で高融点金属たとえばタンタル製のカッ
プ２に収納し、このカップ２を、更に、ペレットを加熱
するための図示してないヒータを内部に収納する同じく
為融点金属たとえばタンタル製の陰極スリーブの一端に
押込み、複数個所でかしめて固定してい゛た。しかし、
含浸形陰極は、動作時、ペレットを約１０００℃に加熱
するため、この高温状態で、かしめ個所に熱応力がかか
り、構造上不安定であった。近年、このような不安定性
を避けるために、スリーブ、カップ、ペレット間をそれ
ぞれレーザ溶接する方法が開発されるに至ったが、電子
放出材料を含浸されたペレットは、溶接性が不安定であ
るという問題が残留していた。In an example of a conventional impregnated cathode, as shown in a side cross-sectional view in FIG.
A so-called pellet 1 impregnated with an electron-emitting material made of CaO, A 12x03, etc. is housed in a shallow cylindrical cup 2 made of a high-melting point metal such as tantalum and covering the surface other than the electron-emitting surface, and this cup 2 is Furthermore, a heater (not shown) for heating the pellets was pushed into one end of the cathode sleeve made of a metal with a similar melting point, such as tantalum, housed inside, and fixed by caulking at multiple locations. but,
During operation, the impregnated cathode heats the pellet to about 1000° C., so thermal stress is applied to the caulked portions at this high temperature, making it structurally unstable. In recent years, in order to avoid such instability, methods have been developed to laser weld sleeves, cups, and pellets, but the weldability of pellets impregnated with electron-emitting materials is unstable. The problem remained.
なお、この種の陰極としては、例えば特開昭５９−２８
７号公報に記載されたものなど、が知られている。This type of cathode is, for example, disclosed in Japanese Patent Application Laid-Open No. 59-28
The one described in Publication No. 7 is known.
本発明の目的は、カップとの溶接性が安定、良好なペレ
ット構造を有する含浸形陰極を提供することにある。An object of the present invention is to provide an impregnated cathode having a pellet structure that is stable in weldability with a cup and has a good pellet structure.
上記目的を達成するために本発明においては、タングス
テンの多孔質焼結体を、通常の高密度、ハ１強度のタン
グステンの環状体にかた（嵌合させたものに電子放出材
料を含浸させたペレットを、上記圓融点金属製のカップ
に収納してカップに溶接固定することとした。In order to achieve the above object, in the present invention, a porous sintered body of tungsten is fitted into a conventional high-density, high-strength tungsten annular body, and the body is impregnated with an electron-emitting material. The pellets were stored in a cup made of the melting point metal and fixed to the cup by welding.
これは電子放出材料を含浸させてないタングステンの多
孔質焼結体は、タンタルカップとの溶接性が良好である
が、電子放出材料を含浸させたのちのタングステンの多
孔質焼結体すなわちペレットは、カップとの溶接性が不
安定であることが判明したからである。This is because a porous sintered tungsten body that is not impregnated with an electron-emitting material has good weldability with a tantalum cup, but a porous sintered body of tungsten that is impregnated with an electron-emissive material, that is, a pellet, has good weldability with a tantalum cup. This is because the weldability with the cup was found to be unstable.
第１図（ａ）は本発明に係るペレットの平面断面図、第
１図（ｂ）はその側断面図、第１図（Ｃ）は本発明に係
るペレットをカップ２に収納し、このカップを陰極スリ
ーブ３の一端に押込み、各部材の間を夫々レーザ溶接し
て固定した状態を示す側断面図である。第１図（ａ）、
（ｂ）で、４はタングステンの多孔質焼結体、５は通常
の高密度、高強度のタングステンの環状体である。この
ようなものに電子放出材料を含浸させると、多孔質焼結
体４の部分には電子放出材料が含浸されるが、高密度の
タングステン環状体には電子放出材料は含浸されない。FIG. 1(a) is a plan sectional view of a pellet according to the present invention, FIG. 1(b) is a side sectional view thereof, and FIG. 1(C) shows a pellet according to the present invention stored in a cup 2. FIG. 3 is a side cross-sectional view showing a state in which the cathode sleeve 3 is pushed into one end of the cathode sleeve 3 and the respective members are fixed by laser welding. Figure 1(a),
In (b), 4 is a porous sintered body of tungsten, and 5 is an ordinary high-density, high-strength tungsten annular body. When such a material is impregnated with an electron-emitting material, the porous sintered body 4 is impregnated with the electron-emitting material, but the high-density tungsten annular body is not impregnated with the electron-emitting material.
（なお、電子放出材料はタングステンの多孔質焼結体４
の平らな表裏面から含浸して行くことになり、側面（円
筒面）からは含浸しないが、図示のように側面の面積に
比し、平らな表裏面の面積の方が広いから、電子放出材
料の含浸は従来のペレットの場合と同様に行われる。）
したがって、本発明に係るペレットのタンタル製のカッ
プへの溶接は、カップと通常の高密度タングステンとの
間で行われることとなり、確実、安定な溶接状態が得ら
れる。なお、タングステンの多孔質焼結体と、この多孔
質焼結体がかたく嵌合された通常の高密度タングステン
環状体との間を、電子放出材料の含浸工程以前に溶接し
ておけば、高温に加熱された使用状態でも両者の結合。(The electron emitting material is a porous sintered body of tungsten 4.
Impregnation is carried out from the flat front and back surfaces of the cylindrical surface, and not from the side (cylindrical surface), but as shown in the figure, the area of the flat front and back is larger compared to the side surface, so electrons are emitted. Impregnation of the material takes place as in the case of conventional pellets. )
Therefore, the welding of the pellets according to the present invention to the tantalum cup is performed between the cup and ordinary high-density tungsten, and a reliable and stable welding state can be obtained. Note that if the porous sintered tungsten body and the ordinary high-density tungsten annular body into which the porous sintered body is tightly fitted are welded before the step of impregnating the electron emitting material, high temperature The combination of the two can be maintained even when used in heated conditions.
は機械的に全く安定である。is mechanically quite stable.
以上説明したように本発明によれば、薄い円筒形のペレ
ットの側面（円筒面）は、電子放出材料に含浸されてい
ない通常の高密度なタングステンに被覆されているので
、ペレットとカップとの溶接状態は極めて良好であり、
高温で動作中にも、特性が不安定になるようなことは生
じない。As explained above, according to the present invention, the side surface (cylindrical surface) of the thin cylindrical pellet is coated with ordinary high-density tungsten that is not impregnated with an electron-emitting material, so that the pellet and the cup are not impregnated with each other. The welding condition is extremely good.
Even during operation at high temperatures, the characteristics do not become unstable.
第１図（ａ）、（ｂ）は本発明に係るペレットを示す断
面図、第１図（ｃ）は本発明に係るペレットを陰極スリ
ーブに取付は固定した状態を示す側断面図、第２図は従
来の含浸形陰極の一例を示す側断面図である。
２・−カップ、 ３・−・スリーブ、 ４−タング
ステンの多孔質焼結体、 ５−−−−一通常の高密度タ
ングステンよりなる環状体。
代理人 弁理士 小川 勝馬 ／゛°′第 １
（０−） （ｂ＞
第２図FIGS. 1(a) and 1(b) are cross-sectional views showing pellets according to the present invention, FIG. The figure is a side sectional view showing an example of a conventional impregnated cathode. 2.--Cup, 3.--Sleeve, 4--Porous sintered body of tungsten, 5---1. Annular body made of ordinary high-density tungsten. Agent Patent Attorney Katsuma Ogawa /゛°′ No. 1 (0-) (b> Figure 2
Claims (1)
を、電子放出面以外を被覆する高融点金属製のカップに
収納し、このカップを更に、高融点金属製で内部に上記
タングステンの多孔質焼結体を高温に加熱するためのヒ
ータを収納する、陰極スリーブの端部に取付けた含浸形
陰極において、タングステンの多孔質焼結体を、通常の
高密度、高強度のタングステンの環状体にかたく嵌合さ
せたものに、電子放出材料を含浸させ、これを上記高融
点金属製のカップに収納したことを特徴とする含浸形陰
極。A porous sintered body of tungsten impregnated with an electron-emitting material is housed in a cup made of a high-melting point metal that covers the surface other than the electron-emitting surface, and this cup is further covered with a porous sintered body of tungsten made of a high-melting point metal inside. In an impregnated cathode attached to the end of the cathode sleeve that houses a heater for heating the sintered body to a high temperature, a porous sintered body of tungsten is replaced with a conventional high-density, high-strength tungsten annular body. An impregnated cathode characterized in that the tightly fitted part is impregnated with an electron emitting material, and this is housed in the cup made of the high melting point metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60285545A JPS62145621A (en) | 1985-12-20 | 1985-12-20 | Impregnated cathode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60285545A JPS62145621A (en) | 1985-12-20 | 1985-12-20 | Impregnated cathode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62145621A true JPS62145621A (en) | 1987-06-29 |
Family
ID=17692923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60285545A Pending JPS62145621A (en) | 1985-12-20 | 1985-12-20 | Impregnated cathode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62145621A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01225033A (en) * | 1988-03-04 | 1989-09-07 | Hitachi Ltd | Impregnated type cathode body structure and manufacture thereof |
| DE4143096A1 (en) * | 1990-12-28 | 1992-07-02 | Gold Star Co | Impregnated cathode prodn. - by sintering metal powder to form pellet, fixing in cathode ring and impregnating pellet |
-
1985
- 1985-12-20 JP JP60285545A patent/JPS62145621A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01225033A (en) * | 1988-03-04 | 1989-09-07 | Hitachi Ltd | Impregnated type cathode body structure and manufacture thereof |
| DE4143096A1 (en) * | 1990-12-28 | 1992-07-02 | Gold Star Co | Impregnated cathode prodn. - by sintering metal powder to form pellet, fixing in cathode ring and impregnating pellet |
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