JP2753008B2 - Impregnated cathode - Google Patents
Impregnated cathodeInfo
- Publication number
- JP2753008B2 JP2753008B2 JP30953488A JP30953488A JP2753008B2 JP 2753008 B2 JP2753008 B2 JP 2753008B2 JP 30953488 A JP30953488 A JP 30953488A JP 30953488 A JP30953488 A JP 30953488A JP 2753008 B2 JP2753008 B2 JP 2753008B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- pellet
- impregnated
- bottom plate
- electron
- 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
【発明の詳細な説明】 産業上の利用分野 本発明は、TV用受像管、オシロスコープ用観測管、撮
像管または進行波管などの電子管に用いられる含浸型陰
極に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impregnated cathode used for an electron tube such as a TV picture tube, an oscilloscope observation tube, an imaging tube or a traveling wave tube.
従来の技術 従来、ヒータを内蔵した帽状金属スリーブの天板部状
に、モリブデン製カップ体の底板部を溶着し、バリウム
・カルシウム・アルミネート等の電子放射性物質を含浸
した多孔質タングステン製のペレットを前記底板部上に
固着せしめてなる含浸型陰極が知られている。2. Description of the Related Art Conventionally, a bottom plate of a molybdenum cup body is welded to a top plate of a cap-shaped metal sleeve with a built-in heater, and a porous tungsten made of porous tungsten impregnated with an electron-emitting substance such as barium, calcium, or aluminate. An impregnated cathode in which pellets are fixed on the bottom plate is known.
かかる含浸型陰極を備えた電子管は、高電流密度の電
子ビームを生ぜしめ得る反面、陰極の動作温度が比較的
高いので、前記カップ体や前記金属スリーブをモリブデ
ンまたはその合金等の高融点金属で形成しなければなら
ない。このため、前記ペレット、前記カップ体および前
記金属スリーブを一体に組み立てる場合の溶接が容易で
ないばかりでなく、前記ペレットに含浸させた電子放射
性物質が溶接時の高温で蒸発するという問題点があっ
た。An electron tube equipped with such an impregnated cathode can generate an electron beam with a high current density, but the operating temperature of the cathode is relatively high, so that the cup body and the metal sleeve are made of a high melting point metal such as molybdenum or an alloy thereof. Must be formed. For this reason, not only is welding not easy when assembling the pellet, the cup body, and the metal sleeve together, but also there is a problem that the electron-emitting substance impregnated in the pellet evaporates at a high temperature during welding. .
特開昭63−64236号公報に開示されている発明では、
モリブデンからなるカップ体にレニウムもしくはその合
金またはルテニウムもしくはその合金からなる表面層を
有せしめ、溶接時におけるカップ体の脆化を防いでい
る。また、ペレットとカップ体とをレーザ溶接したの
ち、前記ペレットに電子放射性物質を含浸させることに
より、電子放射性物質の溶接時における蒸発を防いでい
る。In the invention disclosed in JP-A-63-64236,
The cup body made of molybdenum is provided with a surface layer made of rhenium or its alloy or ruthenium or its alloy to prevent embrittlement of the cup body during welding. Further, after the pellet and the cup body are laser-welded, the pellet is impregnated with an electron-emitting substance to prevent evaporation of the electron-emitting substance during welding.
発明が解決しようとする課題 しかし、カップ体に固着したのちのペレットに電子放
射性物質を含浸させようとすると、含浸のための装置や
治具が複雑化する。Problems to be Solved by the Invention However, if the electron-emitting material is impregnated into the pellet after being fixed to the cup body, the impregnation device and jig become complicated.
課題を解決するための手段 本発明の含浸型陰極は、ヒータを内蔵した帽状金属ス
リーブの天板部上にモリブデン製カップ体の底板部を溶
着し、電子放射性物質を含浸した多孔質タングステン製
のペレットを前記底板部上に固着してなる含浸型陰極に
おいて、前記カップ体と前記金属スリーブ、または、前
記カップ体と前記ペレットとを、Osを主体としたOs−Ru
合金、Os−Ｗ合金またはIrからなる厚さ0.1〜１μｍの
薄層を介して、抵抗溶接法により溶着したものである。Means for Solving the Problems The impregnated cathode of the present invention is made of a porous tungsten impregnated with an electron-emitting substance by welding a bottom plate of a molybdenum cup body on a top plate of a cap-shaped metal sleeve containing a heater. In the impregnated cathode formed by fixing the pellets on the bottom plate portion, the cup body and the metal sleeve, or the cup body and the pellets, Os-Ru mainly Os
It is obtained by welding by a resistance welding method through a thin layer of 0.1 to 1 μm made of an alloy, an Os—W alloy or Ir.
作 用 このように構成すると、ペレットの裏面やカップ体の
裏面に設けられたOsを主体としたOs−Ru合金等の厚さ0.
1〜１μｍの薄層が、モリブデン製のカップ体や金属ス
リーブの融点に近い融点を有することから、ペレットと
カップ体との抵抗溶接や、カップ体と金属スリーブとの
抵抗溶接が短時間ででき、しかも良好な溶接面を得るこ
とができる。このため、電子放射性物質を含浸した状態
のペレットをキャップ体に抵抗溶接しても、電子放射性
物質を蒸発させることは少なく、含浸用の装置や治具が
複雑化することもない。また、前記薄層は電子放射特性
に悪影響を及ぼさないのみならず、Osを主体としたOs−
Ru合金等からなる厚さ0.1〜１μｍの薄層は電子放射特
性を良好ならしめるので、この薄層が含浸ペレットの裏
面のみならず表面側に及んでいてもよく、被着の作業性
が非常によいという利点がある。Operation With this configuration, the Os-Ru alloy or the like mainly composed of Os provided on the back surface of the pellet or the back surface of the cup body has a thickness of 0.
Since the thin layer of 1 to 1 μm has a melting point close to the melting point of molybdenum cup and metal sleeve, resistance welding between pellet and cup and resistance welding between cup and metal sleeve can be done in a short time. In addition, a good weld surface can be obtained. Therefore, even if the pellet impregnated with the electron-emitting substance is resistance-welded to the cap body, the electron-emitting substance rarely evaporates, and the impregnation device and jig are not complicated. Further, the thin layer not only does not adversely affect the electron emission characteristics, but also Os-
Since a thin layer made of a Ru alloy or the like and having a thickness of 0.1 to 1 μm improves the electron emission characteristics, this thin layer may extend not only on the back side but also on the front side of the impregnated pellet, and the workability of deposition is extremely low. There is an advantage that it is good.
実施例 つぎに、本発明を図面に示した実施例とともに説明す
る。Next, the present invention will be described with reference to embodiments shown in the drawings.
バリウム・カルシウム・アルミネート等の電子放射性
物質を含浸した多孔質タングステン製のペレット１は、
モリブデン製のカップ体２の底板部2a上に固着されてお
り、底板部2aは帽状の金属スリーブ３の天板部3aに固着
されている。そして、金属スリーブ３内にヒータ４が納
められている。５は陰極支持用の金属細線で、本例では
直径0.05mmのレニウムタングステン合金（WRe）線を用
いている。金属スリーブ３はレニウムモリブデン合金
（Mo−Re）からなる。A porous tungsten pellet 1 impregnated with an electron-emitting substance such as barium, calcium, aluminate,
The bottom plate 2a of the cup body 2 made of molybdenum is fixed to the bottom plate 2a, and the bottom plate 2a is fixed to the top plate 3a of the cap-shaped metal sleeve 3. The heater 4 is housed in the metal sleeve 3. Reference numeral 5 denotes a thin metal wire for supporting the cathode, and in this example, a rhenium tungsten alloy (WRe) wire having a diameter of 0.05 mm is used. The metal sleeve 3 is made of a rhenium-molybdenum alloy (Mo-Re).
ペレット１の底板部2a側の面には、Osを主体としたOs
−Ru合金の薄層６が被着されており、かかるペレットは
カップ体２の底板部2a上に、薄層６を介して抵抗溶接に
より固着されている。カップ体２の天板部3a側の面に
も、Osを主体としたOs−Ruの薄層７が被着されており、
かかる天板部は底板部2aに薄層７を介して抵抗溶接によ
り固着されている。両薄層6,7は、Os（オスミウム）約8
0重量％、Ru（ルテニウム）約20重量％のOs−Ru合金か
らなり、薄層6,7の各層厚は約0.5μｍである。この層厚
は0.1μｍ〜１μｍが適当で、これよりも薄い溶接性改
善の効果が十分に得られず、逆に厚すぎると、被着の処
理の長時間を要して不経済である。薄層の被着には通常
の真空蒸着法を適用してもよいが、スパッタリング法を
適用するのが好ましい。スパッタリング法を適用する
と、Mo等の高融点金属に対しても容易かつ堅固に薄層を
形成することができる。On the surface of the pellet 1 on the side of the bottom plate 2a, Os mainly composed of Os
A thin layer 6 of a -Ru alloy is applied, and the pellet is fixed on the bottom plate 2a of the cup body 2 by resistance welding via the thin layer 6. A thin layer 7 of Os-Ru mainly composed of Os is also attached to the surface of the cup body 2 on the side of the top plate 3a,
The top plate is fixed to the bottom plate 2a via a thin layer 7 by resistance welding. Os (osmium) about 8
It consists of an Os-Ru alloy of 0% by weight and about 20% by weight of Ru (ruthenium), and each of the thin layers 6 and 7 has a thickness of about 0.5 μm. The thickness of the layer is suitably 0.1 μm to 1 μm, and the effect of improving the weldability, which is thinner than this, cannot be sufficiently obtained. For deposition of the thin layer, a normal vacuum deposition method may be applied, but it is preferable to apply a sputtering method. When the sputtering method is applied, a thin layer can be easily and firmly formed even on a high melting point metal such as Mo.
前述の実施例では、両薄層6,7にOsを主体としたOs−R
u合金を用いたが、この他にもOs−Ｗ合金を用いること
ができ、若干の不純物を含んでいてもよい。また、かか
る合金に代えてIr（イリジウム）を用いることもでき
る。In the above-described embodiment, the Os-R mainly composed of Os is used for both the thin layers 6 and 7.
Although the u alloy is used, an Os-W alloy may be used in addition to the u alloy, and may contain some impurities. Further, Ir (iridium) can be used instead of such an alloy.
図示の実施例では、金属細線５を天板部2aと底板部3a
との間に介在させているが、金属細線５は非常に細いの
で、前記抵抗溶接は主として天板部2aと底板部3aとが直
接接触した部分で行われる。金属細線５は天板部2aと底
板部3aとの間に介在させる必要はなく、金属スリーブ３
の適所にとりつけることができる。In the illustrated embodiment, the thin metal wire 5 is connected to the top plate 2a and the bottom plate 3a.
However, since the thin metal wire 5 is very thin, the resistance welding is performed mainly at a portion where the top plate 2a and the bottom plate 3a are in direct contact. The metal wire 5 need not be interposed between the top plate portion 2a and the bottom plate portion 3a.
In the right place.
発明の効果 本発明は上述のように構成されるので、電子放射特性
の優れた含浸型陰極を、特殊な含浸装置を用いることな
く抵抗溶接法による溶着で溶接性よく組み立てることが
できる。さらに、本発明は、ペレットにOsを主体とした
Os−Ru合金等からなる厚さ0.1〜１μｍの薄層を被着す
るので、この薄層が含浸ペレットの表面側に及んでいて
もよく、被着の作業性も非常によい。Effect of the Invention Since the present invention is configured as described above, an impregnated cathode having excellent electron emission characteristics can be assembled with good weldability by welding by a resistance welding method without using a special impregnating device. Furthermore, the present invention is mainly composed of Os in the pellet
Since a thin layer made of an Os-Ru alloy or the like having a thickness of 0.1 to 1 μm is applied, this thin layer may extend to the surface side of the impregnated pellet, and the workability of the application is very good.
第１図は本発明を実施した含浸型陰極の側断面図であ
る。 １……ペレット、２……カップ状体、３……金属スリー
ブ、４……ヒータ、6,7……薄層。FIG. 1 is a side sectional view of an impregnated cathode embodying the present invention. 1 ... pellet, 2 ... cup-shaped body, 3 ... metal sleeve, 4 ... heater, 6, 7 ... thin layer.
Claims (1)
部上にモリブデン製カップ体の底板部を溶着し、電子放
射性物質を含浸した多孔質タングステン製のペレットを
前記底板部上に固着してなる含浸型陰極において、前記
カップ体と前記金属スリーブ、または、前記カップ体と
前記ペレットとを、Osを主体としたOs−Ru合金、Os−Ｗ
合金またはIrからなる厚さ0.1〜１μｍの薄層を介し
て、抵抗溶接法により溶着したことを特徴とする含浸型
陰極。1. A bottom plate of a cup made of molybdenum is welded to a top plate of a cap-shaped metal sleeve containing a heater, and a porous tungsten pellet impregnated with an electron-emitting substance is fixed on the bottom plate. In the impregnated cathode comprising, the cup and the metal sleeve, or the cup and the pellet, Os-Ru alloy mainly Os, Os-W
An impregnated cathode which is welded by a resistance welding method via a thin layer of an alloy or Ir having a thickness of 0.1 to 1 [mu] m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30953488A JP2753008B2 (en) | 1988-12-07 | 1988-12-07 | Impregnated cathode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30953488A JP2753008B2 (en) | 1988-12-07 | 1988-12-07 | Impregnated cathode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02155139A JPH02155139A (en) | 1990-06-14 |
| JP2753008B2 true JP2753008B2 (en) | 1998-05-18 |
Family
ID=17994174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30953488A Expired - Fee Related JP2753008B2 (en) | 1988-12-07 | 1988-12-07 | Impregnated cathode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2753008B2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8403031A (en) * | 1984-10-05 | 1986-05-01 | Philips Nv | METHOD FOR MANUFACTURING A SCANDAL FOLLOW-UP CATHOD AND SCANDAL FOLLOW-UP CATHOD Manufactured By This Method |
| JPS6334832A (en) * | 1986-07-30 | 1988-02-15 | Hitachi Ltd | Manufacture of impregnated cathode |
| JPS6364236A (en) * | 1986-09-05 | 1988-03-22 | Hitachi Ltd | Manufacure of impregnated cathode |
| JPS63254637A (en) * | 1987-04-10 | 1988-10-21 | Hitachi Ltd | Impregnated cathode |
-
1988
- 1988-12-07 JP JP30953488A patent/JP2753008B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02155139A (en) | 1990-06-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |