JPS6180732A - Electron beam tube - Google Patents
Electron beam tubeInfo
- Publication number
- JPS6180732A JPS6180732A JP20321284A JP20321284A JPS6180732A JP S6180732 A JPS6180732 A JP S6180732A JP 20321284 A JP20321284 A JP 20321284A JP 20321284 A JP20321284 A JP 20321284A JP S6180732 A JPS6180732 A JP S6180732A
- Authority
- JP
- Japan
- Prior art keywords
- annular
- tube
- magnetic
- magnetic pole
- collector
- 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
- 238000010894 electron beam technology Methods 0.000 title claims abstract description 24
- 230000000737 periodic effect Effects 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims abstract 2
- 230000035515 penetration Effects 0.000 abstract 3
- 230000005540 biological transmission Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 2
- 235000014121 butter Nutrition 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
- H01J23/087—Magnetic focusing arrangements
- H01J23/0873—Magnetic focusing arrangements with at least one axial-field reversal along the interaction space, e.g. P.P.M. focusing
Landscapes
- Microwave Tubes (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、電子ビーム管、特にその電子ビームを集束す
るために用いられる周期磁界装置の改良に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in an electron beam tube, and in particular to a periodic magnetic field device used to focus the electron beam.
（従来技術およびその問題点）
進行波管装置など比較的細長い遅波回路の内部に電子ビ
ームを通過させる電子ビーム管においては、電子ビーム
を集束する手段の一つとして一般に周期磁界集束装置が
用いられる。周期磁界集束装置は、複数個の円環状永久
磁石と円環状磁極片とが交互に積層式九九構造をしてお
Ｑ１高周波回路内を通過する電子ビームと同軸的に配置
されている。ところがこの周期磁界を構成する円環状永
久磁石は、それ自体磁界強匿が完全に軸対称となってい
ないことが多く、そのため円環状永久磁石を回転し７’
ｌ磁性体片を貼りつけることにより電子ビームが本来の
軌道を通過するよう（磁界調整を行なっている。しかし
ながら、管球が受ける機械的衝撃や、動作中に何らかの
原因で、円環状永久磁石が調整された位置から少しでも
動くと、電子ビームが本来の軌道からはずれてしまい、
特にヘリックス形進行波管では、電子ビームがへリソク
スに衝突することによりヘリックスが局部的に高温に加
熱されるために多量のガスを放出し、カソード劣化を招
く。ま九、高周波数、大出力の進行波管では、ヘリック
スが溶けてしまうことがある。したがってこのような不
具合を避けるためには、周期磁界集束装置を構成する部
品は何らかの方法で強固に固定されていなければならな
い。(Prior art and its problems) In electron beam tubes such as traveling wave tube devices that pass an electron beam through a relatively long and narrow slow wave circuit, a periodic magnetic field focusing device is generally used as one means for focusing the electron beam. It will be done. The periodic magnetic field focusing device has a multiplication table structure in which a plurality of annular permanent magnets and annular magnetic pole pieces are alternately stacked, and is arranged coaxially with the electron beam passing through the Q1 high frequency circuit. However, the annular permanent magnet that makes up this periodic magnetic field is often not completely axially symmetrical in terms of magnetic field reinforcement, so the annular permanent magnet is rotated and
l By attaching a piece of magnetic material, the electron beam passes through its original trajectory (magnetic field adjustment is performed).However, due to mechanical shock to the tube or for some reason during operation, the annular permanent magnet If the electron beam moves even slightly from its adjusted position, the electron beam will deviate from its original trajectory.
In particular, in a helical traveling wave tube, when the electron beam collides with the helix, the helix is locally heated to a high temperature and releases a large amount of gas, causing cathode deterioration. In a traveling wave tube with high frequencies and high power, the helix may melt. Therefore, in order to avoid such problems, the parts that make up the periodic magnetic field focusing device must be firmly fixed by some method.
第２図は、従来使用されている周期磁界集束装置を進行
波管に用いた場合の一般例？＠面図で示したものである
、円環状永久磁石１は、第３図に示すように２つに分割
されている。ヘリックス５は、管状の外周管３の内側に
絶縁支持棒４ｔ−介して収納されている。円環状磁極片
２は、外周管３の外周上に予め複数個装着されており、
各円環状磁極片２の間に２分割された円環状永久磁石１
ｔ−分割面に隙間がないように装着することによって周
期磁界集束装置を構成している。遅波回路部の外周管３
は、両端で電子銃部６と非磁性のコレクタ支持体８を介
してコレクタ部７とにつながれており、その間に円環状
永久磁石１と円環状磁極片２とが隙間なく装置できるよ
うに予め設計しである。しかし外周管３の熱膨張係数が
、円環状永久磁石１および円環状磁極片２の熱膨張係数
よりも大きい為、動作時の電子ビームの熱の影響により
円環状永久磁石１と円環状磁極片２との間に隙間を生じ
、最良の電子ビーム透過になるような磁界パターンに調
整する作業が困難であった。また最良の電子ビーム透過
になるように調整しても一旦非動作状態にした後動作状
態にし九場合、磁界バター７がずれて電子ビーム透過が
悪くなることがあっ几。Figure 2 shows a general example of a conventional periodic magnetic field focusing device used in a traveling wave tube. The annular permanent magnet 1 shown in the @ side view is divided into two parts as shown in FIG. The helix 5 is housed inside the tubular outer tube 3 via an insulating support rod 4t. A plurality of annular magnetic pole pieces 2 are installed in advance on the outer periphery of the outer circumferential tube 3,
An annular permanent magnet 1 divided into two between each annular magnetic pole piece 2
A periodic magnetic field focusing device is constructed by mounting the device so that there is no gap between the T-divided surfaces. Outer tube 3 of slow wave circuit section
is connected to the electron gun section 6 and the collector section 7 via a non-magnetic collector support 8 at both ends, and the annular permanent magnet 1 and the annular magnetic pole piece 2 are connected in advance so that the annular permanent magnet 1 and the annular magnetic pole piece 2 can be assembled without any gap between them. It is designed. However, since the thermal expansion coefficient of the outer tube 3 is larger than that of the annular permanent magnet 1 and the annular magnetic pole piece 2, the effect of the heat of the electron beam during operation causes the annular permanent magnet 1 and the annular magnetic pole piece to 2, making it difficult to adjust the magnetic field pattern to provide the best electron beam transmission. Further, even if the adjustment is made to obtain the best electron beam transmission, if the magnetic field butter 7 is shifted after being put into a non-operating state and then put into an operating state, the electron beam transmission may deteriorate.
本発明の目的は、これらの欠点を除去し、電子ビームの
透過調整作業が容易で最良の電子ビーム透過特性を持続
できる周期磁界集束装置を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to provide a periodic magnetic field focusing device that eliminates these drawbacks, facilitates electron beam transmission adjustment work, and maintains the best electron beam transmission characteristics.
（問題点を解決する九めの手段）
本発明は、電子銃部、遅波回路部、コレクタ部および遅
波回路の外周管に同軸的に複数個の円環状の永久磁石と
磁極片とを交互に積層して配置した周期磁界集束装置と
を有する電子ビーム管において、コレクタ部に最も近い
円環状磁極片と非磁ｉイ冬
性のコレクタ史との間に外周管と円環状永久磁石および
磁極片との管軸方向への熱膨張差を相殺するような熱膨
張係数を有する円環状の非磁性金属部材を設けたことを
特徴とする。このような構成により電子ビーム透過特性
の向上と安定性を増大させることができる。(Ninth Means for Solving the Problems) The present invention provides a plurality of annular permanent magnets and magnetic pole pieces coaxially arranged in the electron gun section, the slow wave circuit section, the collector section, and the outer tube of the slow wave circuit. In an electron beam tube having periodic magnetic field focusing devices arranged in alternating layers, an outer circumferential tube and a toroidal permanent magnet and It is characterized by providing an annular non-magnetic metal member having a coefficient of thermal expansion that offsets the difference in thermal expansion with the magnetic pole piece in the tube axis direction. Such a configuration can improve electron beam transmission characteristics and increase stability.
（実施例） 以下、図面を参照して本発明の詳細な説明する。(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.
第“１図に本発明の１実施例を示す。従来技術と異なる
部分は、コレクタ部７に最も近い円環状磁極片９と非磁
性のコレクタ支持体８との間に外周管３と円環状永久磁
石１および円環状磁極片２との管軸方向への熱膨張差を
相殺するような熱膨張係数を有する円環状の非磁性金属
部材１０を挿入したことである。非磁性金属部材１０ｔ
−挿入することにより電子ビームの熱による外周管３と
円環状永久磁石１および円環状磁極片２との熱膨張差を
非磁性金属部材１０が有する熱膨張係数により相殺でき
る。このため動作時においても円環状永久磁石ｌと円環
状磁極片２との間に生じる隙間を最小にすることができ
円環状永久磁石１と円環状磁極片２の固定強度が、動作
時におけるビーム透過調整作業が容易罠行なうことがで
き作業性の良い周期磁界集束装置を提供できる。ｆ７を
一度、最良なビーム透過となるように磁界ｔ−調整すれ
ば、再現性も十分得られる。An embodiment of the present invention is shown in FIG. An annular non-magnetic metal member 10 having a coefficient of thermal expansion that cancels out the difference in thermal expansion in the tube axis direction between the permanent magnet 1 and the annular magnetic pole piece 2 is inserted.Non-magnetic metal member 10t
- By inserting the non-magnetic metal member 10, the difference in thermal expansion between the outer circumferential tube 3, the annular permanent magnet 1, and the annular magnetic pole piece 2 due to the heat of the electron beam can be offset by the thermal expansion coefficient of the non-magnetic metal member 10. Therefore, even during operation, the gap created between the annular permanent magnet 1 and the annular magnetic pole piece 2 can be minimized. It is possible to provide a periodic magnetic field focusing device that allows easy transmission adjustment work and has good workability. Sufficient reproducibility can be obtained by once adjusting the magnetic field t of f7 so as to obtain the best beam transmission.
（発明の効果）
以上述べ九ように、本発明によれば、電子ビーム透過の
調整が容易で安定に動作する電子ビーム管を得ることが
できる。(Effects of the Invention) As described above, according to the present invention, it is possible to obtain an electron beam tube that allows easy adjustment of electron beam transmission and operates stably.
第１図は本発明による周期磁界集束装置を進行波管に用
いた場合の縦断面図、第２図は、従来の周期磁界装置を
進行波管に用いた場合の縦断面図、第３図は、２分割に
された円環状永久磁石を示す斜視図である。
１・・・・・・円環状永久磁石、２・・・・・・円環状
磁極片、３・・・・・・外周管、４・・・・・・支持棒
、５・・・・・・ヘリックス、６・・・・・・電子銃部
、７・・・・・・コレクタ部、８・・・・・・コレフタ
支持体、９・・・・・・コレクタ部に最も近い円環状磁
極片、１ｏ・川・・非磁性金属部材。
／］；丁−＼
代理人 弁理士 内 原 晋付″゛７＼￥３回FIG. 1 is a longitudinal cross-sectional view of the periodic magnetic field focusing device according to the present invention used in a traveling wave tube, FIG. 2 is a longitudinal cross-sectional view of the conventional periodic magnetic field device used in a traveling wave tube, and FIG. FIG. 2 is a perspective view showing an annular permanent magnet divided into two parts. DESCRIPTION OF SYMBOLS 1... Annular permanent magnet, 2... Annular magnetic pole piece, 3... Outer tube, 4... Support rod, 5...・Helix, 6... Electron gun part, 7... Collector part, 8... Corefter support, 9... Annular magnetic pole closest to the collector part Piece, 1o River... Non-magnetic metal member. ／]；Ding-＼ Agent Patent Attorney Shinsuke Uchihara″゛7＼￥3 times
Claims (1)
の外周管に同軸的に複数個の円環状の永久磁石と磁極片
とを交互に積層して配置した周期磁界集束装置を有する
電子ビーム管において、コレクタ部に最も近い円環状磁
極片と非磁性のコレクタ支持体との間に、前記外周管と
前記永久磁石および磁極片との管軸方向への熱膨張差を
相殺するような熱膨張係数を有する円環状の非磁性金属
部材を具備したことを特徴とする電子ビーム管。An electron gun having a periodic magnetic field focusing device in which a plurality of annular permanent magnets and magnetic pole pieces are alternately stacked and arranged coaxially in an electron gun section, a slow wave circuit section, a collector section, and an outer peripheral tube of the slow wave circuit. In the beam tube, a structure is provided between the annular magnetic pole piece closest to the collector portion and the non-magnetic collector support to cancel out the difference in thermal expansion in the tube axis direction between the outer circumferential tube and the permanent magnet and magnetic pole piece. An electron beam tube comprising an annular non-magnetic metal member having a coefficient of thermal expansion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20321284A JPS6180732A (en) | 1984-09-28 | 1984-09-28 | Electron beam tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20321284A JPS6180732A (en) | 1984-09-28 | 1984-09-28 | Electron beam tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6180732A true JPS6180732A (en) | 1986-04-24 |
Family
ID=16470319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20321284A Pending JPS6180732A (en) | 1984-09-28 | 1984-09-28 | Electron beam tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6180732A (en) |
-
1984
- 1984-09-28 JP JP20321284A patent/JPS6180732A/en active Pending
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