JPS6326918Y2 - - Google Patents
Info
- Publication number
- JPS6326918Y2 JPS6326918Y2 JP1981131511U JP13151181U JPS6326918Y2 JP S6326918 Y2 JPS6326918 Y2 JP S6326918Y2 JP 1981131511 U JP1981131511 U JP 1981131511U JP 13151181 U JP13151181 U JP 13151181U JP S6326918 Y2 JPS6326918 Y2 JP S6326918Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- focusing device
- periodic magnetic
- permanent magnet
- field focusing
- 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
Links
- 230000000737 periodic effect Effects 0.000 claims description 28
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 238000010894 electron beam technology Methods 0.000 claims description 14
- 239000002470 thermal conductor Substances 0.000 claims 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- LTPBRCUWZOMYOC-UHFFFAOYSA-N Beryllium oxide Chemical compound O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Microwave Tubes (AREA)
Description
【考案の詳細な説明】
本考案は電子ビーム管において電子ビームを集
束するために使用される周期磁界集束装置の改良
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in periodic magnetic field focusing devices used to focus electron beams in electron beam tubes.
進行波管など比較的細長い高周波回路の内部に
電子ビームを通過させる電子ビーム管において、
電子ビームを集束する手段の一つとして一般に周
期磁界集束装置を用いることは広く知られてい
る。第１図、第２図は従来行なわれている周期磁
界集束装置を進行波管に用いた場合の１例を断面
図で示したものである。以下第１図、第２図によ
り従来形の周期磁界集束装置を説明する。進行波
管１は電子ビームを発射する電子銃１１、電子ビ
ームを高周波と作用させる高周波回路１２及び電
子ビームを捕獲するコレクタ１３とを含み、高周
波回路１２は進行波管１の外囲器の一部を形成す
る管状の外周管１４の内側にベリリア磁器などか
らなる支持棒１５を介して収納されている。周期
磁界集束装置２は全体として筒状を呈し、外周管
１４の軸線に沿つて同軸的に磁化された複数個の
円筒状永久磁石２１及びこの永久磁石２１の間に
介在されている磁性体のポールピース２２から構
成されており、軸上に電子ビームを集束させるた
めの周期磁界を発生させる。 In an electron beam tube that passes an electron beam through a relatively long and narrow high-frequency circuit such as a traveling wave tube,
It is widely known that a periodic magnetic field focusing device is generally used as one means for focusing an electron beam. FIGS. 1 and 2 are cross-sectional views of an example in which a conventional periodic magnetic field focusing device is used in a traveling wave tube. A conventional periodic magnetic field focusing device will be explained below with reference to FIGS. 1 and 2. The traveling wave tube 1 includes an electron gun 11 that emits an electron beam, a high frequency circuit 12 that causes the electron beam to interact with a high frequency, and a collector 13 that captures the electron beam. The support rod 15 made of beryllia porcelain or the like is housed inside a tubular outer circumferential tube 14 forming a section. The periodic magnetic field focusing device 2 has a cylindrical shape as a whole, and includes a plurality of cylindrical permanent magnets 21 coaxially magnetized along the axis of the outer tube 14 and a magnetic material interposed between the permanent magnets 21. It is composed of a pole piece 22 and generates a periodic magnetic field to focus the electron beam on the axis.
しかし、進行波管の出力が数十Ｗ以上となつて
高周波回路１２に衝突する電子ビームが増加する
と高周波回路１２は部分的に高温となり多量の熱
を発生するようになる。この熱は支持棒１５を介
して外周管１４からポールピース２２に伝達され
円筒状永久磁石２１を含めて周期磁界集束装置２
の温度が上昇し、円筒状永久磁石材料としてフエ
ライト磁石、あるいは磁気エネルギーが大きいサ
マリウムコバルト磁石を用いる場合比較的温度係
数が大きく、中心軸の周期磁界強度を低下させ、
電子ビームの集束能力を劣化させるようになる。
従つて、このような高出力進行波管の周期磁界集
束装置２を冷却することが種々考えられているが
フエライト磁石及びサマリウムコバルト磁石は熱
伝導率が悪いため周期磁界集束装置２しいては高
周波回路１２を十分冷却することが困難であつ
た。 However, when the output of the traveling wave tube exceeds several tens of watts and the number of electron beams colliding with the high frequency circuit 12 increases, the high frequency circuit 12 partially becomes high in temperature and generates a large amount of heat. This heat is transferred from the outer circumferential tube 14 to the pole piece 22 via the support rod 15, and the periodic magnetic field focusing device 2 including the cylindrical permanent magnet 21
When a ferrite magnet or a samarium cobalt magnet with large magnetic energy is used as the cylindrical permanent magnet material, the temperature coefficient is relatively large and the periodic magnetic field strength of the central axis is reduced.
The focusing ability of the electron beam will deteriorate.
Therefore, various attempts have been made to cool the periodic magnetic field focusing device 2 of such a high-power traveling wave tube, but since ferrite magnets and samarium cobalt magnets have poor thermal conductivity, the periodic magnetic field focusing device 2 and the high frequency It was difficult to cool the circuit 12 sufficiently.
本考案の目的は、上記欠点を改善し周期磁界集
束装置の冷却を十分行ない得るようにして高周波
回路部の熱容量を向上させた電子ビーム管の周期
磁界集束装置を提供しようとするものである。 SUMMARY OF THE INVENTION An object of the present invention is to provide a periodic magnetic field focusing device for an electron beam tube that improves the above-mentioned drawbacks and improves the heat capacity of the high frequency circuit section by sufficiently cooling the periodic magnetic field focusing device.
以下、第３図、第４図に基づいて本考案の一実
施例の説明を行なう。進行波管１は、従来形と同
様に外囲容器内に電子銃１１、高周波回路１２、
コレクタ１３、支持棒１５、外周管１４を含むも
のである。周期磁界集束装置２は棒状永久磁石２
３、ポールピース２２、非磁性の金属円筒２４か
ら構成されている。すなわち、棒状永久磁石２３
は長手方向に磁化され、金属円筒２４の内側に明
けられた穴に等間隔に挿入され、金属円筒２４と
ポールピース２２は交互に同軸状に組合されてい
る。金属円筒２４は非磁性の良熱伝導体であり銅
又はアルミニウムなどから製作され、金属円筒２
４の内径と外周管１４の外径とはほぼ等しく、金
属円筒２４の内周面と外周管１４の外周面は密に
接触している。さらに金属円筒２４の内周面と外
周管１４の外周面との接触をよくするために金属
円筒２４と外周管１４とはあらかじめ樹脂などで
接着固定しておくことはもちろん可能である。本
実施例では８ケの棒状永久磁石２３を金属円筒２
４の内部に等間隔に配設した場合を図示している
が棒状永久磁石２３の配設数、間隔は任意でよい
が、棒状永久磁石２３の配設数は６〜12ケが実用
的である。 Hereinafter, one embodiment of the present invention will be explained based on FIGS. 3 and 4. The traveling wave tube 1 includes an electron gun 11, a high frequency circuit 12,
It includes a collector 13, a support rod 15, and an outer tube 14. The periodic magnetic field focusing device 2 includes a rod-shaped permanent magnet 2
3. It is composed of a pole piece 22 and a non-magnetic metal cylinder 24. That is, the rod-shaped permanent magnet 23
are magnetized in the longitudinal direction and inserted into holes drilled inside the metal cylinder 24 at equal intervals, and the metal cylinder 24 and the pole pieces 22 are alternately assembled coaxially. The metal cylinder 24 is a non-magnetic good heat conductor and is made of copper or aluminum.
The inner diameter of the metal cylinder 24 and the outer diameter of the outer circumferential tube 14 are approximately equal, and the inner circumferential surface of the metal cylinder 24 and the outer circumferential surface of the outer circumferential tube 14 are in close contact. Furthermore, in order to improve the contact between the inner circumferential surface of the metal cylinder 24 and the outer circumferential surface of the outer circumferential tube 14, the metal cylinder 24 and the outer circumferential tube 14 can of course be bonded and fixed in advance with resin or the like. In this embodiment, eight rod-shaped permanent magnets 23 are attached to a metal cylinder 2.
Although the number and spacing of the bar-shaped permanent magnets 23 are shown as being arranged at equal intervals inside the magnet 4, it is practical to set the number of bar-shaped permanent magnets 23 to 6 to 12. be.
しかしてこのような構造にすれば、棒状永久磁
石材料として熱伝導率がよくないフエライト磁石
やサマリウムコバルト磁石を用いても高周波回路
１２上に部分的に集中して熱が発生してもその熱
は支持棒１５を介して外周管１４から熱伝導率の
良好な金属円筒２４に伝達され、周期磁界集束装
置２の外周に設けられた放熱体（図示せず）を介
して放散される。このため棒状永久磁石２３の温
度上昇が少なくなり中心軸上の周期磁界強度の変
化が低減出来て安定な電子ビームの集束を得るこ
とが出来る。云いかえれば、高周波回路１２から
周期磁界集束装置２までの熱抵抗を小さく出来る
ので大電力の進行波管に適用出来る周期磁界集束
装置を得ることが出来る。 However, with this structure, even if a ferrite magnet or a samarium cobalt magnet, which does not have good thermal conductivity, is used as the rod-shaped permanent magnet material, even if heat is partially concentrated on the high frequency circuit 12 and generated, the heat will be absorbed. is transmitted from the outer circumferential tube 14 to the metal cylinder 24 having good thermal conductivity via the support rod 15, and is radiated via a heat radiator (not shown) provided on the outer periphery of the periodic magnetic field focusing device 2. Therefore, the temperature rise of the bar-shaped permanent magnet 23 is reduced, and changes in the strength of the periodic magnetic field on the central axis can be reduced, making it possible to obtain stable focusing of the electron beam. In other words, since the thermal resistance from the high frequency circuit 12 to the periodic magnetic field focusing device 2 can be reduced, it is possible to obtain a periodic magnetic field focusing device that can be applied to a traveling wave tube with high power.
第５図、第６図は別の実施例を示す図であり、
進行波管１は従来形と同様な構造を成し周期磁界
集束装置２は棒状永久磁石２３、ポールピース２
２及び非磁性の金属円筒２４から構成され、金属
円筒２４の外周囲には等間隔に配列された切り欠
き溝２５が明けられ、切り欠き溝２５に棒状永久
磁石２３は配設される。このような構造にすれ
ば、高周波回路１２から周期磁界集束装置２まで
の熱抵抗を低減出来るのに加えて周期磁界集束装
置２の軸上中心磁界の調整が可能となる。すなわ
ち進行波管１に周期磁界集束装置２を組入れた後
も棒状永久磁石２３の取外しが可能であり、配設
された棒状永久磁石２３を取外すことによつて軸
上中心磁界を下げることが出来る。又棒状永久磁
石２３の磁界強度を加減することによつても軸上
中心磁界の調整が可能となり、製造段階における
磁界調整が容易となる。 FIG. 5 and FIG. 6 are diagrams showing another embodiment,
The traveling wave tube 1 has the same structure as the conventional type, and the periodic magnetic field focusing device 2 includes a rod-shaped permanent magnet 23 and a pole piece 2.
2 and a non-magnetic metal cylinder 24, notch grooves 25 arranged at equal intervals are formed on the outer periphery of the metal cylinder 24, and the bar-shaped permanent magnets 23 are disposed in the notch grooves 25. With such a structure, not only can the thermal resistance from the high frequency circuit 12 to the periodic magnetic field focusing device 2 be reduced, but also the axial central magnetic field of the periodic magnetic field focusing device 2 can be adjusted. That is, even after the periodic magnetic field focusing device 2 is installed in the traveling wave tube 1, the rod-shaped permanent magnet 23 can be removed, and by removing the installed rod-shaped permanent magnet 23, the axial central magnetic field can be lowered. . Furthermore, the axial center magnetic field can be adjusted by adjusting the magnetic field strength of the bar-shaped permanent magnet 23, making it easy to adjust the magnetic field at the manufacturing stage.
以上説明したように、本考案は周期磁界集束装
置の放熱効果を改良したもので磁石材料として、
熱伝導率は比較的小さいがエネルギー積が非常に
大きいサマリウムコバルト磁石を用いる場合に大
なる効果を発揮する。又本考案を周期磁界装置の
一部に、特に熱を発生し易い高周波回路部のコレ
クタ側の一部に適用することはもちろん可能であ
り且つ実用的である。 As explained above, the present invention improves the heat dissipation effect of a periodic magnetic field focusing device, and as a magnet material,
This is particularly effective when using samarium cobalt magnets, which have a relatively low thermal conductivity but a very large energy product. Furthermore, it is of course possible and practical to apply the present invention to a part of a periodic magnetic field device, particularly to a part of the collector side of a high-frequency circuit section where heat is easily generated.
第１図は従来行なわれてい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図は第
１図のＡ−Ａ断面図、第３図は本考案に係る周期
磁界集束装置を進行波管に用いた場合の第１の実
施例の縦断面図、第４図は第３図のＢ−Ｂ断面
図、第５図は第２の実施例の縦断面図、第６図は
第５図のＣ−Ｃ断面図である。
図において、１は進行波管、２は周期磁界集束
装置、１１は電子銃、１２は高周波回路、１３は
コレクタ、１４は外周管、１５は高周波回路の支
持棒、２１は円筒状の永久磁石、２２はポールピ
ース、２３は棒状永久磁石、２４は非磁性の金属
円筒、２５は非磁性の金属円筒２４の外周囲に明
けられた切り欠き溝である。
Fig. 1 is a longitudinal cross-sectional view of a conventional periodic magnetic field focusing device used in a traveling wave tube, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a periodic magnetic field according to the present invention. FIG. 4 is a longitudinal sectional view of the first embodiment when the focusing device is used in a traveling wave tube, FIG. 4 is a BB sectional view of FIG. 3, and FIG. 5 is a longitudinal sectional view of the second embodiment. FIG. 6 is a sectional view taken along line CC in FIG. In the figure, 1 is a traveling wave tube, 2 is a periodic magnetic field focusing device, 11 is an electron gun, 12 is a high frequency circuit, 13 is a collector, 14 is an outer tube, 15 is a support rod for the high frequency circuit, and 21 is a cylindrical permanent magnet. , 22 is a pole piece, 23 is a rod-shaped permanent magnet, 24 is a non-magnetic metal cylinder, and 25 is a notch groove formed around the outer periphery of the non-magnetic metal cylinder 24.
Claims (1)
久磁石及びポールピースを交互に同軸状に配置し
た周期磁界集束装置において、前記永久磁石を棒
状永久磁石とし、非磁性の良熱伝導体からなる金
属円筒の内側に明けられた複数個の穴に前記棒状
永久磁石を配設し、前記金属円筒とポールピース
を交互に同軸状に組合せたことを特徴とする周期
磁界集束装置。 In a periodic magnetic field focusing device in which a plurality of permanent magnets and pole pieces are arranged coaxially and alternately around the outer periphery of a high frequency circuit of an electron beam tube, the permanent magnet is a bar-shaped permanent magnet, and the permanent magnet is a metal made of a non-magnetic good thermal conductor. A periodic magnetic field focusing device characterized in that the rod-shaped permanent magnets are disposed in a plurality of holes drilled inside a cylinder, and the metal cylinder and pole pieces are alternately combined coaxially.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13151181U JPS5836551U (en) | 1981-09-04 | 1981-09-04 | Periodic magnetic field focusing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13151181U JPS5836551U (en) | 1981-09-04 | 1981-09-04 | Periodic magnetic field focusing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5836551U JPS5836551U (en) | 1983-03-09 |
| JPS6326918Y2 true JPS6326918Y2 (en) | 1988-07-21 |
Family
ID=29925085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13151181U Granted JPS5836551U (en) | 1981-09-04 | 1981-09-04 | Periodic magnetic field focusing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5836551U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5522790B2 (en) * | 1973-06-28 | 1980-06-19 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS579798Y2 (en) * | 1978-08-02 | 1982-02-25 | ||
| JPS6041477Y2 (en) * | 1980-10-20 | 1985-12-17 | 松下電器産業株式会社 | combustion appliances |
-
1981
- 1981-09-04 JP JP13151181U patent/JPS5836551U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5522790B2 (en) * | 1973-06-28 | 1980-06-19 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5836551U (en) | 1983-03-09 |
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