JP3353303B2 - Impregnated cathode structure - Google Patents
Impregnated cathode structureInfo
- Publication number
- JP3353303B2 JP3353303B2 JP2847791A JP2847791A JP3353303B2 JP 3353303 B2 JP3353303 B2 JP 3353303B2 JP 2847791 A JP2847791 A JP 2847791A JP 2847791 A JP2847791 A JP 2847791A JP 3353303 B2 JP3353303 B2 JP 3353303B2
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- heater
- open end
- metal cup
- cathode
- 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
- Solid Thermionic Cathode (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は含浸型陰極構体に関し、
特に消費電力を少くした含浸型陰極構体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impregnated cathode structure,
In particular, the present invention relates to an impregnated cathode assembly having reduced power consumption.
【０００２】[0002]
【従来の技術】従来、この種の含浸型陰極構体は、図３
に示すような構造よりなる。すなわち、電子放射物質が
含浸された陰極基体３１がモリブデン等の高融点金属か
らなるスリーブ３２の一端開口部にろう材３３にてろう
接され、また、スリーブ３２の内部には、ヒータ３４が
スリーブ３２の他端開口部より挿入され内蔵された構造
となっている。2. Description of the Related Art Conventionally, this type of impregnated type cathode assembly is shown in FIG.
The structure is as shown in FIG. That is, the cathode substrate 31 impregnated with the electron emitting substance is brazed to the one end opening of the sleeve 32 made of a high melting point metal such as molybdenum with the brazing material 33, and a heater 34 is provided inside the sleeve 32. It is structured to be inserted and built in from the other end opening of 32.
【０００３】[0003]
【発明が解決しようとする課題】従来のこのような構造
の含浸型陰極構体では、スリーブ３２内に配置されたヒ
ータ３４からの熱は、輻射によりスリーブ３２並びに陰
極基体３１に伝えられる為、所定の陰極動作温度を得る
為にはヒータ３４の温度をかなり高温にする必要があ
り、大きなヒータ電力を必要とするばかりではなく、ヒ
ータ３４自体のショートや断線等の不具合が発生すると
いう問題点があった。In the conventional impregnated cathode assembly having such a structure, heat from the heater 34 disposed in the sleeve 32 is transmitted to the sleeve 32 and the cathode base 31 by radiation. In order to obtain the cathode operating temperature of the above, it is necessary to raise the temperature of the heater 34 to a considerably high temperature, which not only requires a large heater power, but also causes problems such as short-circuit and disconnection of the heater 34 itself. there were.
【０００４】例えば、直径２ｍｍのＭタイプと呼ばれる
含浸型陰極と外径３ｍｍのスリーブとから成る陰極構体
で、電流密度Ｊ＝２Ａ／平方ｃｍ，陰極動作輝度温度
１，０００℃を得る時のヒータ３４の温度は、約１，４
００℃でヒータ電力は約４Ｗを要し、この動作条件で約
０．５％の割合でヒータ３４の線間のショートの不具合
が発生していた。[0004] For example, a cathode structure comprising an impregnated cathode called an M type having a diameter of 2 mm and a sleeve having an outer diameter of 3 mm, a heater for obtaining a current density J = 2 A / square cm and a cathode operating luminance temperature of 1,000 ° C. 34 is about 1,4
At 00 ° C., the heater power required about 4 W, and a short circuit between the heaters 34 occurred at a rate of about 0.5% under these operating conditions.
【０００５】本発明の目的は、ヒータからの熱効率が良
く、大きなヒータ電力を要せずヒータショートや断線の
ない含浸型陰極構体を提供することにある。An object of the present invention is to provide an impregnated cathode assembly which has good thermal efficiency from a heater, does not require a large heater power, and has no heater short-circuit or disconnection.
【０００６】[0006]
【課題を解決するための手段】本発明は、スリーブと、
前記スリーブの一方の開口端より該スリーブ内に挿入さ
れた第１の金属カップと、前記第１の金属カップに装着
された電子放射物質が含浸された陰極基体と、ヒータを
埋込剤により固定して前記スリーブの他方の開口端より
該スリーブ内に挿入された第２の金属カップとを有し、
前記スリーブの一方の開口端と前記第１の金属カップの
開口端とがレーザ溶接され、前記スリーブの他方の開口
端と前記第２の金属カップの開口端とがレーザ溶接され
ており、前記スリーブの他方の開口端とレーザ溶接され
る前記第２の金属カップの開口端から離間して前記埋込
剤が前記第２のカップ内に設けられている含浸型陰極構
体にある。SUMMARY OF THE INVENTION The present invention comprises a sleeve,
A first metal cup inserted into the sleeve from one open end of the sleeve, a cathode substrate impregnated with an electron emitting substance mounted on the first metal cup, and a heater fixed with an embedding agent And a second metal cup inserted into the sleeve from the other open end of the sleeve,
The one open end of the sleeve and the open end of the first metal cup are laser-welded, the other open end of the sleeve and the open end of the second metal cup are laser-welded , Is laser welded with the other open end of
The embedding is spaced apart from an open end of the second metal cup.
An agent is in the impregnated cathode assembly provided in the second cup .
【０００７】[0007]
【実施例】次に、本発明の実施例について図面を参照し
て説明する。Next, embodiments of the present invention will be described with reference to the drawings.
【０００８】図１（ａ），（ｂ）は本発明に関連する技
術を説明する断面図である。FIGS. 1A and 1B show a technique related to the present invention.
It is sectional drawing explaining operation | movement .
【０００９】この技術は、図１（ａ），（ｂ）に示すよ
うに、陰極基体１は、ポーラスタングステンに電子放射
物質であるＢａＯ，ＣａＯ，Ａｌ2 Ｏ3 を４：１：１の
割合で含浸させ、電子放射面にはＯｓ−Ｒｈが約５，０
００オングストロームコーティングされている。この陰
極基体１は、モリブデンからなるスリーブ２にＭｏ−Ｒ
ｕのろう材３を用いてろう接されていると同時に、陰極
基体１の電子放射面の裏面は、このＭｏ−Ｒｕのろう材
３で封孔処理されている。In this technique , as shown in FIGS. 1 (a) and 1 (b), a cathode substrate 1 is composed of porous tungsten and electron-emitting substances, BaO, CaO and Al 2 O 3 , in a ratio of 4: 1: 1. Os-Rh on the electron emission surface is about 5,0
00 Angstrom coating. The cathode base 1 is provided with a Mo-R sleeve 2 made of molybdenum.
The back surface of the electron emission surface of the cathode substrate 1 is sealed with the Mo-Ru brazing material 3 at the same time when the brazing is performed using the brazing material 3 of u.
【００１０】また、このスリーブ２の内部には、予め、
スリーブ２に内接するモリブデン製の金属カップ４にヒ
ータ５をアルミナ粉末の埋込剤６で焼結固定された円筒
状発熱体１０が挿入されており、挿入後、この円筒状発
熱体１０の外側開口端とスリーブ２の陰極基体１と反対
側の開口端とが、Ｎｉろう材７を用いて、高周波加熱等
によりろう接され固定支持されている。In addition, inside the sleeve 2,
A cylindrical heating element 10 in which a heater 5 is sintered and fixed with an embedding agent 6 of alumina powder is inserted into a molybdenum metal cup 4 inscribed in the sleeve 2. The open end and the open end of the sleeve 2 opposite to the cathode substrate 1 are brazed and fixedly supported by high-frequency heating or the like using a Ni brazing material 7.
【００１１】Ｍｏ−Ｒｅ等の金属支持体８は、スリーブ
２と外側支持筒体９とを連結支持するもので、それぞれ
に電気抵抗溶接で接続されている。A metal support 8 made of Mo-Re or the like supports and connects the sleeve 2 and the outer support cylinder 9 and is connected to each other by electric resistance welding.
【００１２】図２は本発明の実施例の断面図である。FIG. 2 is a sectional view of an embodiment of the present invention.
【００１３】実施例は、図２に示すように、陰極基体２
１は、２０ｗｔ％イリジウムと８０ｗｔ％タングステン
からなる多孔質の金属基体に電子放射物質であるＢａ
Ｏ，ＣａＯ，Ａｌ2 Ｏ3 を４：１：１の割合で含浸さ
せ、Ｍｏ−Ｒｅ製の金属カップ２２に装着され、さら
に、金属カップ２２は、Ｍｏ−Ｒｅ製のスリーブ２３に
レーザ溶接される。このレーザ溶接のナゲット２４は、
陰極基体２１の外周部と金属カップ２２とスリーブ２３
にわたる様にレーザ溶接されていることを示している。
ヒータ２５は、スリーブ２３に内接するＭｏ−Ｒｅ製の
金属カップ２６の中に、予め、アルミナの埋設剤２７に
よって固定されている。In the embodiment , as shown in FIG.
No. 1 is a porous metal substrate composed of 20 wt% iridium and 80 wt% tungsten, and Ba, which is an electron-emitting substance,
O, CaO, and Al 2 O 3 are impregnated at a ratio of 4: 1: 1, attached to a metal cup 22 made of Mo-Re, and the metal cup 22 is laser-welded to a sleeve 23 made of Mo-Re. You. This laser welded nugget 24
Outer peripheral portion of cathode base 21, metal cup 22, and sleeve 23
This indicates that laser welding has been performed.
The heater 25 is fixed in advance with an embedding agent 27 of alumina in a Mo-Re metal cup 26 inscribed in the sleeve 23.
【００１４】次に、ヒータ２５を予め埋設した金属カッ
プ２６をスリーブ２３に挿入しそれぞれの開口端をレー
ザ溶接で接続させ固定する。Next, a metal cup 26 in which a heater 25 is embedded in advance is inserted into the sleeve 23, and the respective open ends are connected and fixed by laser welding.
【００１５】金属支持体並びに外側の陰極支持筒体への
接続方法は、前記の図１（ａ）と同様に行われる。The connection to the metal support and the outer cathode support cylinder is performed in the same manner as in FIG. 1 (a) .
【００１６】このようにして製作した本実施例の含浸型
陰極構体と図３に示す従来の含浸型陰極構体とを真空ベ
ルジャーに設置し、所定の輝度動作温度１，０００℃を
得る時のヒータ温度並びにヒータ電力を比較測定した結
果、本実施例の含浸型陰極構体の方がヒータ温度を平均
値で、約３００℃下げる事ができた。又、ヒータ電力に
ついては、約１０％ヒータの消費電力を少なくすること
ができた。これは、ヒータからの熱が従来タイプは、輻
射によって陰極基体に伝えられていたのに対し、本実施
例の含浸型陰極構体は、伝導によって陰極基体に伝えら
れる為、スリーブ開口部からの損失やヒータの足からの
熱損失が減少したためである。The impregnated cathode structure of the present embodiment manufactured in this way and the conventional impregnated cathode structure shown in FIG. 3 are installed in a vacuum bell jar, and a heater for obtaining a predetermined luminance operating temperature of 1,000 ° C. As a result of comparative measurement of the temperature and the heater power, the impregnated cathode assembly of this example was able to lower the heater temperature by an average value of about 300 ° C. As for the heater power, the power consumption of the heater could be reduced by about 10%. This is because the heat from the heater is transmitted to the cathode base by radiation in the conventional type, whereas the impregnated cathode assembly of the present embodiment is transferred to the cathode base by conduction, so the loss from the sleeve opening is reduced. This is because heat loss from the heater and the feet of the heater has been reduced.
【００１７】さらに、本実施例の含浸型陰極構体は、円
筒状発熱体を独立した部品として製造したものを陰極基
体を保持しているスリーブ組立て、装着，固定する方法
なので、部品の取扱いが容易となり自動化に適しており
量産性に優れている。Further, since the impregnated cathode assembly of this embodiment is manufactured by mounting the cylindrical heating element as an independent part, assembling, mounting and fixing the sleeve holding the cathode base, the handling of the parts is easy. It is suitable for automation and has excellent mass productivity.
【００１８】尚、電子放射材を陰極基体に含浸する工程
とこの円筒状発熱体の製造工程は独立しているので、ヒ
ータリード部に含浸材が付着する心配はなく、ヒータリ
ード線からのエミッションによる不具合はない。Since the step of impregnating the cathode substrate with the electron emitting material and the step of manufacturing the cylindrical heating element are independent, there is no concern that the impregnating material adheres to the heater lead portion, and the emission from the heater lead wire is eliminated. There is no problem due to.
【００１９】[0019]
【発明の効果】以上説明したように本発明は、含浸型陰
極基体を支持するスリーブに、予め、ヒータをアルミナ
で埋設固定してある金属カップを挿入後固定することに
より、熱効率の良い伝導でヒータからの熱を陰極基体へ
伝えられるので、ヒータの温度を従来より低くできると
共にヒータ５の消費電力を少なくできるという効果を有
する。As described above, according to the present invention, by inserting a metal cup in which a heater is embedded and fixed in advance in alumina into a sleeve for supporting an impregnated cathode substrate and fixing the same, heat conduction with high heat efficiency is achieved. Since the heat from the heater can be transmitted to the cathode base, the temperature of the heater can be made lower than before and the power consumption of the heater 5 can be reduced.
【００２０】さらには、金属カップの中にヒータをアル
ミナで埋設固定させた円筒発熱体を独立した工程で製造
した後、陰極基体を支持するスリーブに組立，装着固定
することにより、自動化が容易に出来、量産性に優れて
いるという効果を有する。Furthermore, after a cylindrical heating element in which a heater is embedded and fixed in alumina in a metal cup is manufactured in an independent process, assembly, mounting, and fixing to a sleeve supporting the cathode base facilitates automation. It has the effect of being excellent in mass production.
【図１】本発明に関連する技術を説明する断面図であ
る。FIG. 1 is a cross-sectional view illustrating a technique related to the present invention.
【図２】本発明の実施例の断面図である。FIG. 2 is a sectional view of an embodiment of the present invention.
【図３】従来の含浸型陰極構体の一例の断面図である。FIG. 3 is a cross-sectional view of an example of a conventional impregnated cathode structure.
【符号の説明】 １，２１，３１ 陰極基体 ２，２３，３２ スリーブ ３，７，３３ ろう材 ４，２２，２６ 金属カップ ５，２５，３４ ヒータ ６，２７ 埋込剤 ８，３５ 金属支持体 ９，３６ 外側支持筒体 １０ 円筒状発熱体 ２４，２８ レーザ溶接のナゲット[Description of Signs] 1,21,31 Cathode substrate 2,23,32 Sleeve 3,7,33 Brazing material 4,22,26 Metal cup 5,25,34 Heater 6,27 Embedding agent 8,35 Metal support 9,36 Outer support cylinder 10 Cylindrical heating element 24,28 Nugget of laser welding
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01J 1/28 H01J 9/04 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) H01J 1/28 H01J 9/04
Claims (1)
端より該スリーブ内に挿入された第１の金属カップと、
前記第１の金属カップに装着された電子放射物質が含浸
された陰極基体と、ヒータを埋込剤により固定して前記
スリーブの他方の開口端より該スリーブ内に挿入された
第２の金属カップとを有し、前記スリーブの一方の開口
端と前記第１の金属カップの開口端とがレーザ溶接さ
れ、前記スリーブの他方の開口端と前記第２の金属カッ
プの開口端とがレーザ溶接されており、前記スリーブの
他方の開口端とレーザ溶接される前記第２の金属カップ
の開口端から離間して前記埋込剤が前記第２のカップ内
に設けられていることを特徴とする含浸型陰極構体。1. A sleeve, and a first metal cup inserted into the sleeve from one open end of the sleeve,
A cathode base impregnated with the electron-emitting substance mounted on the first metal cup, and a second metal cup inserted into the sleeve from the other open end of the sleeve by fixing a heater with an embedding agent And the one open end of the sleeve and the open end of the first metal cup are laser welded, and the other open end of the sleeve and the open end of the second metal cup are laser welded. Of the sleeve
The second metal cup being laser welded to the other open end
The embedding agent is separated from the opening end of the second cup in the second cup.
Impregnated-type cathode assembly, characterized in that provided in the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2847791A JP3353303B2 (en) | 1991-02-22 | 1991-02-22 | Impregnated cathode structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2847791A JP3353303B2 (en) | 1991-02-22 | 1991-02-22 | Impregnated cathode structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04267030A JPH04267030A (en) | 1992-09-22 |
| JP3353303B2 true JP3353303B2 (en) | 2002-12-03 |
Family
ID=12249730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2847791A Expired - Fee Related JP3353303B2 (en) | 1991-02-22 | 1991-02-22 | Impregnated cathode structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3353303B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3652894A (en) | 1969-07-01 | 1972-03-28 | Licentia Gmbh | Indirectly heated hot-cathodes with pink ruby insulator |
-
1991
- 1991-02-22 JP JP2847791A patent/JP3353303B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3652894A (en) | 1969-07-01 | 1972-03-28 | Licentia Gmbh | Indirectly heated hot-cathodes with pink ruby insulator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04267030A (en) | 1992-09-22 |
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