JPS58145198A - Magnetically shielding method - Google Patents
Magnetically shielding methodInfo
- Publication number
- JPS58145198A JPS58145198A JP57027534A JP2753482A JPS58145198A JP S58145198 A JPS58145198 A JP S58145198A JP 57027534 A JP57027534 A JP 57027534A JP 2753482 A JP2753482 A JP 2753482A JP S58145198 A JPS58145198 A JP S58145198A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- shielding method
- lid
- signal line
- magnetically shielding
- 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
- Soft Magnetic Materials (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（１）技術分野
本発明は磁気遮蔽方法、特に磁気遮蔽体の接合部および
／または開口部を封止する方法に関する。DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field The present invention relates to a magnetic shielding method, and more particularly to a method for sealing joints and/or openings in a magnetic shield.
（２）技術の背景
近年ジョセフンン型電子計算機の開発が進められてきた
。この型の電子計算機は外部からの磁気を遮断して動作
させる必要がある。(2) Technical Background In recent years, the development of Josephine-type electronic computers has been progressing. This type of computer needs to be operated while blocking external magnetism.
（３）従来技術と問題点
一般に、磁気遮蔽方法として、高透磁率を有する材料、
たとえばＡ？−マロイ、ミューメタルなどの金属板から
包囲体を利用する。このとき容器と蓋との間に間隙があ
る。従来は、蓋全容器に溶接することも行なわれたが、
溶接部分は透磁率が低下する欠点があった。また入出力
信号縁の通過する開口からも外部からの磁気が進入する
欠点があった。(3) Prior art and problems In general, as magnetic shielding methods, materials with high magnetic permeability,
For example, A? -Use an enclosure made of metal plates such as malloy or mumetal. At this time, there is a gap between the container and the lid. Previously, the lid was welded to the entire container, but
The welded part had the disadvantage of reduced magnetic permeability. Another drawback is that external magnetism enters through the opening through which the input/output signal edge passes.
（４）発明の目的 本発明の目的は上記欠点を解消することである。(4) Purpose of the invention The aim of the invention is to eliminate the above-mentioned drawbacks.
（５） 発明の′！＃成
本発明の上記目的は、磁気遮蔽包囲体の接合部および／
または開口部を磁性流体によって封止する磁気遮蔽方法
によって達成することができる。(5) Invention'! #Construction The above object of the present invention is to improve the joints and/or
Alternatively, this can be achieved by a magnetic shielding method in which the opening is sealed with a magnetic fluid.
本発明で使用する磁性流体は、たとえばマグネタイトの
ような高透磁率會有する微粒子を溶媒、たとえばケロシ
ン、ブタンなどに分散させたものを使用することができ
る。このような磁性流体は表面張力が大きいので、接合
部および開口部における信号線との間隙を容易に封止す
ることができる。The magnetic fluid used in the present invention may be one in which fine particles such as magnetite having high magnetic permeability are dispersed in a solvent such as kerosene or butane. Since such a magnetic fluid has a high surface tension, gaps between the joint and the signal line at the opening can be easily sealed.
（６） 実施例
第１図は本発明の磁性流体封止を説明するための磁気遮
蔽包囲体の断面図である。装ｗｌけ磁気遮蔽するために
、厚み２咽のパーマロイ板を成形して半径２５０ｍｍ、
高さ６００ｍｍとした容器２に入ｉ＋、、同じ拐料の蓋
で被った。装置１に連結した入出力信号線４は蓋３の中
央の開口から引出すが、信号線４を引出す蓋３の部分を
四人させた。第２図はこの凹入部の詳細を示す拡大断面
図である。凹入部における誓３と信号ね４との間隙およ
び蓋３と容器２との間隙に、マグネタイトをケロシンに
分散させた磁性流体を光填して封止した。この磁性流体
の有無による磁気珊蔽度、すなわち外＠Ｓ磁場対内部磁
場の比を測定した。内部磁場の測定点を容器ｌの中心部
付近および信号線４の引出し口の付近としたとき、中心
部伺近では約１２０から約１３５に、１に引出し口付近
では約２０から約５０に増力ｌした。(6) Embodiment FIG. 1 is a sectional view of a magnetic shielding enclosure for explaining the magnetic fluid sealing of the present invention. In order to shield the magnetic field, a permalloy plate with a thickness of 2 mm was molded to a radius of 250 mm.
It was placed in a container 2 with a height of 600 mm and covered with a lid made of the same material. The input/output signal line 4 connected to the device 1 is drawn out from the central opening of the lid 3, and the portion of the cover 3 from which the signal line 4 is drawn out is made up of four people. FIG. 2 is an enlarged sectional view showing details of this recessed portion. The gap between the seal 3 and the signal line 4 in the recess and the gap between the lid 3 and the container 2 were optically filled with a magnetic fluid containing magnetite dispersed in kerosene and sealed. The degree of magnetic shielding, that is, the ratio of the external @S magnetic field to the internal magnetic field, was measured with and without the magnetic fluid. When measuring the internal magnetic field near the center of the container 1 and near the outlet of the signal line 4, the strength increases from about 120 to about 135 near the center, and from about 20 to about 50 near the outlet. I did it.
（７）発明の効果
上記実施例から明か々ように、磁気遮蔽材料からなる包
囲体の接合部および開口部に磁性流体を光填することに
よって磁気遮蔽効果を高めることができる。(7) Effects of the Invention As is clear from the above embodiments, the magnetic shielding effect can be enhanced by optically filling the joints and openings of the enclosure made of magnetic shielding material with magnetic fluid.
第１図は本発明のイみ気遮蔽方法を冥加した包囲体の１
！′Ｔ面図であり、
第２図は第１図の包囲体の蓋に設けた信号線引出し開口
部の拡大断面図である。
１・・・磁気遮蔽を必要とする装置、２・・・磁気遮蔽
包囲体の容器、３・・・蓋、４・・・入出力信号線、５
・・・磁性流体。
特許出願人
富士通株式会社
特許出願代理人
弁理士 青 木 朗
弁理士 西舘和之
弁理士 内 １）幸 男
弁理士 出 口 昭 之Fig. 1 shows one of the enclosures incorporating the inhalation shielding method of the present invention.
! FIG. 2 is an enlarged sectional view of a signal line lead-out opening provided in the lid of the enclosure shown in FIG. 1. DESCRIPTION OF SYMBOLS 1... Device requiring magnetic shielding, 2... Magnetic shielding enclosure container, 3... Lid, 4... Input/output signal line, 5
...Magnetic fluid. Patent applicant Fujitsu Ltd. Patent agent Akira Aoki Patent attorney Kazuyuki Nishidate Patent attorney 1) Yukio Patent attorney Akira Deguchi
Claims (1)
性流体によって封止する磁気遮蔽方法。1. A magnetic shielding method in which a joint and/or an opening of a magnetic shielding enclosure is sealed with a magnetic fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57027534A JPS58145198A (en) | 1982-02-24 | 1982-02-24 | Magnetically shielding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57027534A JPS58145198A (en) | 1982-02-24 | 1982-02-24 | Magnetically shielding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58145198A true JPS58145198A (en) | 1983-08-29 |
Family
ID=12223766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57027534A Pending JPS58145198A (en) | 1982-02-24 | 1982-02-24 | Magnetically shielding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58145198A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59172297A (en) * | 1983-03-19 | 1984-09-28 | 株式会社トーキン | Low temperature and cryogenic magnetic shielding device |
| JPH0534798A (en) * | 1991-08-01 | 1993-02-12 | Fuji Photo Film Co Ltd | Camera system and film take-up motor for it |
| JPH0888496A (en) * | 1994-09-20 | 1996-04-02 | Nec Corp | Electromagnetic shielding material |
-
1982
- 1982-02-24 JP JP57027534A patent/JPS58145198A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59172297A (en) * | 1983-03-19 | 1984-09-28 | 株式会社トーキン | Low temperature and cryogenic magnetic shielding device |
| JPH0365680B2 (en) * | 1983-03-19 | 1991-10-14 | ||
| JPH0534798A (en) * | 1991-08-01 | 1993-02-12 | Fuji Photo Film Co Ltd | Camera system and film take-up motor for it |
| JPH0888496A (en) * | 1994-09-20 | 1996-04-02 | Nec Corp | Electromagnetic shielding material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3806902A (en) | Magnetic head read-to-write gap crossfeed shielding | |
| JPS58145198A (en) | Magnetically shielding method | |
| GB2119753A (en) | Tape cassette | |
| JPH07106116A (en) | Junction structure for magnetic members | |
| JPH04149887A (en) | Magnetic disk device | |
| JPH0261873A (en) | Exchangeable disk | |
| JP2811596B2 (en) | Weight sheet | |
| JPH0395717A (en) | Magnetic head | |
| JPS58145199A (en) | Magnetic shielding enclosure by magnetic fluid | |
| JPS62203400A (en) | Shielding case whose gap is filled with magnetic particles and manufacture of the same | |
| JPS58133157U (en) | Copying machine developing device | |
| JPH0370853B2 (en) | ||
| JPH01173789A (en) | Shielding case for electric equipment | |
| JPS5987687A (en) | Magnetic bubble memory device | |
| JPS5965487A (en) | Radioactive ray detecting element for high density mounting | |
| JPS5954070A (en) | Supporting device of magnetic head | |
| JPS6029240U (en) | water level detector | |
| JPS5936392A (en) | Magnetic bubble memory device | |
| JPS58173299U (en) | shield | |
| JPS58180679U (en) | Sealed electrical equipment | |
| JPS5848216A (en) | Magnetic head | |
| JPS59129911A (en) | Magnetic head | |
| JPS58146959U (en) | Magnetic particle capsule for magnetic particle flaw detection | |
| JPS58176593A (en) | Radioactivity shielding body | |
| JPS5821944U (en) | cathode ray tube device |