JPS59197198A - Magnetic shielding device - Google Patents

Magnetic shielding device

Info

Publication number
JPS59197198A
JPS59197198A JP7181683A JP7181683A JPS59197198A JP S59197198 A JPS59197198 A JP S59197198A JP 7181683 A JP7181683 A JP 7181683A JP 7181683 A JP7181683 A JP 7181683A JP S59197198 A JPS59197198 A JP S59197198A
Authority
JP
Japan
Prior art keywords
magnetic
magnetic shielding
shielding device
coil
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.)
Granted
Application number
JP7181683A
Other languages
Japanese (ja)
Other versions
JPH0256840B2 (en
Inventor
清野　和男
満 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokin Corp
Original Assignee
Tohoku Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tohoku Metal Industries Ltd filed Critical Tohoku Metal Industries Ltd
Priority to JP7181683A priority Critical patent/JPS59197198A/en
Publication of JPS59197198A publication Critical patent/JPS59197198A/en
Publication of JPH0256840B2 publication Critical patent/JPH0256840B2/ja
Granted legal-status Critical Current

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  • 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】 本発明は、高い磁気遮蔽効果を得る磁気シールド装置に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic shielding device that achieves a high magnetic shielding effect.

従来、磁気遮蔽の方法としては、高い透磁率を有する軟
磁性材料で被遮蔽物体又は空間を包囲する方法が採用さ
れている。この場合、理想的には被逗蔽体には開孔部が
な℃・ことが望ましいが特殊な場合を除いて、種々の理
由でやむを得ず開孔部を設ける場合が多い。当然開孔部
からは磁気が漏洩し、遮蔽効果は低下することになる。Conventionally, as a method of magnetic shielding, a method of surrounding an object or space to be shielded with a soft magnetic material having high magnetic permeability has been adopted. In this case, ideally it is desirable that the shielded body has no openings, but except in special cases, openings are often unavoidably provided for various reasons. Naturally, magnetism leaks from the opening, reducing the shielding effect.

例えば第１図に示す如き片側蓋なしの開田筒体１の磁気
遮蔽効果は、第２図に示す如く、開孔部に近づ（に従い
指数的に減少する。尚、第１図中、Ｈｏは外部静磁界、
Ｈｉは内部静磁界、ｌは円筒体の全長、Ｚは円面体の任
意の位置を夫々示しているつ このため、従来磁気シールドで必要な遮蔽空間を確保す
るために開孔部に施す対策としては、■磁気シールドの
寸法を大きくすること。例えば第１図例において円筒体
の全長ｌを長くする。For example, the magnetic shielding effect of the open field cylinder 1 without a lid on one side as shown in FIG. 1 decreases exponentially as it approaches the opening, as shown in FIG. is the external static magnetic field,
Hi is the internal static magnetic field, l is the total length of the cylindrical body, and Z is the arbitrary position of the cylindrical body. Therefore, as a countermeasure for openings to secure the shielding space required by conventional magnetic shields, ■Increase the dimensions of the magnetic shield. For example, in the example shown in FIG. 1, the total length l of the cylindrical body is increased.

■第３図に示す如く開孔部に磁気シールドのだめの７ラ
ンジ２を設ける。(2) As shown in FIG. 3, a seven flange 2 for magnetic shielding is provided in the opening.

■第４図に示す如く、円筒体１を多層シールド構造にす
る、等の対策が考えられる。(2) As shown in FIG. 4, possible countermeasures include forming the cylindrical body 1 into a multilayer shield structure.

しかしこれらの対策は、いずれも磁気ンールド装置の体
積を増大せしめ、ひいては製造コストが大幅に増大する
欠点を有する。However, all of these measures have the drawback of increasing the volume of the magnetically rolled device, which in turn significantly increases manufacturing costs.

本発明はかかる点に鑑み、磁気シールドの開孔部にコイ
ルを設け、開孔部ρ・ら流入する磁束に対しコイルによ
り逆磁界を発生させて磁気シールド内の遮蔽空間を大き
くし、しいては磁気シールドの小形化、低廉化を、主た
る目的としたものである。In view of this, the present invention provides a coil in the aperture of the magnetic shield, and generates a reverse magnetic field against the magnetic flux flowing through the aperture ρ, thereby enlarging the shielding space within the magnetic shield. The main purpose of this is to make the magnetic shield smaller and cheaper.

以下本発明の一実施例について図面を参照しながら詳細
に説明する。An embodiment of the present invention will be described in detail below with reference to the drawings.

第５図は本発明の一例を示す磁気シールド構造の断面図
である。外径φ−１５０＋ｎｍ、長さｌ　＝３５０ｍｍ
の軟磁性材料より成る磁気ノールド円筒状体５の一方端
に蓋５ａを設け、他方端５１）を開放し、他方端５ｂに
コイル６を巻回して、円面状体５内に流入する磁界と逆
向ぎの磁界を発生せしめた構造である。尚、コイル６０
巻回位置は図に示す如く、外側に巻回してもよく、第６
図に示す如く、内側に巻回してもよい。また分散巻き又
は開孔部付近への集中巻きとすることができる。FIG. 5 is a sectional view of a magnetic shield structure showing an example of the present invention. Outer diameter φ-150+nm, length l = 350mm
A lid 5a is provided at one end of the magnetic nord cylindrical body 5 made of a soft magnetic material, the other end 51) is opened, and a coil 6 is wound around the other end 5b to generate a magnetic field flowing into the circular body 5. This structure generates a magnetic field in the opposite direction. In addition, coil 60
As shown in the figure, the winding position may be outside, and the sixth
As shown in the figure, it may be wound inward. Further, it is possible to perform dispersed winding or concentrated winding near the opening.

コイル６に流す電流値は、磁気シールド開孔部にガウス
メータ等のセンサを取付けることにより、磁気ノールド
装置の設置位置を決定１〜だ後、メータの値を勘案しな
がらコイル電流を可変として最適砥流を決定する。尚、
このような手動式（（代替して、ガウスメータとコイル
用電源との間にコントロ・−ラを介して接続し、自動制
御することもできる。The value of the current flowing through the coil 6 is determined by attaching a sensor such as a Gauss meter to the opening in the magnetic shield. After determining the installation position of the magnetic knoll device, the coil current is varied while taking into account the value of the meter and the optimum grinding is performed. Determine the flow. still,
Alternatively, automatic control can be achieved by connecting the Gaussmeter and the coil power supply via a controller.

このような構成によると、第７図に示す如く、曲線Ａの
如く開放端直前まで磁気遮蔽効果が実現できることが判
明する。尚、曲線Ｂは従来構造の例を示すものであるが
、円筒体の１／２付近から急激に磁気遮蔽効果が悪化し
ているのがわかる。With such a configuration, it has been found that the magnetic shielding effect can be achieved up to just before the open end, as shown by curve A, as shown in FIG. Note that curve B shows an example of a conventional structure, and it can be seen that the magnetic shielding effect deteriorates rapidly from around 1/2 of the cylindrical body.

以−ヒ述べた如（本発明によれば、軟磁性材料より成る
磁気シールド装置において、開孔部にコイルを取付け、
該開孔部から」二記シールド装置内に流入する磁界と逆
の磁界を発生すべくＬ記コイルに直流電流を流して上記
磁気シールド装置を磁気遮蔽したので、磁気シールド装
置全体を太き（することなく、余分なシールド用フラン
ジを設けることなく、多層シールド構造にすることなく
、実用的な磁気遮蔽効果を達成することができる。従っ
て、最小限の容積で最大の磁気シールド空間を有するこ
の種装置を低廉なコストで提供することができる。As described below (according to the present invention, in a magnetic shielding device made of a soft magnetic material, a coil is attached to the opening,
In order to generate a magnetic field opposite to the magnetic field flowing into the shielding device (2) from the opening, a direct current was passed through the coil (L) to magnetically shield the magnetic shielding device. Practical magnetic shielding effect can be achieved without any additional shielding flange or multilayer shielding structure.Therefore, this design has the maximum magnetic shielding space with the minimum volume. The seeding device can be provided at low cost.

【図面の簡単な説明】[Brief explanation of drawings]

、第１図及び第２図は磁気シールド効果の説明に準する
構成図及び線図、第３図及び第４図は従来の磁気シール
ド装置の例を示す図、第５図及び第６図は本発明の一例
及び他の例を示す断面図、第７１ン１（・土木発明装置
の効果の説明に供する線図である。 ５・・円筒状体、５ｂ・・・他方端、６・・・コイル。 出願人代理人　弁理士　秋　山　　　高第１図 、４３゜タ一, FIGS. 1 and 2 are block diagrams and diagrams based on the explanation of the magnetic shielding effect, FIGS. 3 and 4 are diagrams showing examples of conventional magnetic shielding devices, and FIGS. 5 and 6 are diagrams showing examples of conventional magnetic shielding devices. Cross-sectional views showing one example and other examples of the present invention, No. 71 No. 1 (This is a line diagram for explaining the effects of the civil engineering invention device. 5...Cylindrical body, 5b...Other end, 6...・Coil. Applicant's Representative Patent Attorney Takashi Akiyama Figure 1, 43° Taichi

Claims (1)

【特許請求の範囲】[Claims] 軟（ＩＩｉ性材料より成る磁気シールド装置において、
開孔部にコイルを取＋ｆ　ｔ−ｔ−１核間孔部から上記
シールド装置内に流入する磁界と逆の磁界を発生すべく
上記コイルに直流電流を流して上記磁気シールド装置を
磁気遮蔽したことを特徴とする磁気ンールド装置。In a magnetic shielding device made of soft (IIi material),
The magnetic shielding device was magnetically shielded by passing a direct current through the coil to generate a magnetic field opposite to the magnetic field flowing into the shielding device from the internuclear hole. A magnetic unwrapped device characterized by:
JP7181683A 1983-04-22 1983-04-22 Magnetic shielding device Granted JPS59197198A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7181683A JPS59197198A (en) 1983-04-22 1983-04-22 Magnetic shielding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7181683A JPS59197198A (en) 1983-04-22 1983-04-22 Magnetic shielding device

Publications (2)

Publication Number Publication Date
JPS59197198A true JPS59197198A (en) 1984-11-08
JPH0256840B2 JPH0256840B2 (en) 1990-12-03

Family

ID=13471456

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7181683A Granted JPS59197198A (en) 1983-04-22 1983-04-22 Magnetic shielding device

Country Status (1)

Country Link
JP (1) JPS59197198A (en)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6264024A (en) * 1985-09-13 1987-03-20 Mitsubishi Electric Corp Unnecessary radiation preventer
JPS6262751U (en) * 1985-10-08 1987-04-18
JPS6293841A (en) * 1985-10-17 1987-04-30 Mitsubishi Electric Corp Unnecessary radiation preventing device
JPS62100935A (en) * 1985-10-25 1987-05-11 フィリップス　エレクトロニクス　ネムローゼ　フェンノートシャップ Image display device
JPS6273454U (en) * 1985-10-28 1987-05-11
JPS62211839A (en) * 1986-03-12 1987-09-17 Mitsubishi Electric Corp Useless radiation preventer
JPS62211840A (en) * 1986-03-12 1987-09-17 Mitsubishi Electric Corp Useless radiation preventer
JPS62223952A (en) * 1986-03-07 1987-10-01 フィリップス　エレクトロニクス　ネムローゼ　フェンノートシャップ Method and apparatus for reducing straying magnetic field
JPS6326928A (en) * 1986-07-18 1988-02-04 Denki Onkyo Co Ltd Deflection yoke device
JPS6364250A (en) * 1986-09-05 1988-03-22 Denki Onkyo Co Ltd Deflection yoke device
JPS6365944U (en) * 1986-10-17 1988-04-30
JPS63202826A (en) * 1987-02-18 1988-08-22 Denki Onkyo Co Ltd Deflecting yoke device
US5139900A (en) * 1991-03-12 1992-08-18 Sanyo-Denki Kabushikigaisha Zinc alkaline cells
US5198315A (en) * 1991-03-12 1993-03-30 Sanyo-Ekuseru Kabushikigaisha Zinc alkaline cells
US5209995A (en) * 1991-03-12 1993-05-11 Sanyo-Denki Kabushikigaisha Zinc alkaline cells
US5296267A (en) * 1991-01-22 1994-03-22 Toho-Aen Kabushikigaisha Process for preparing non-amalgamated zinc alloy powder for alkali dry cells
US5561333A (en) * 1993-05-10 1996-10-01 Mti, Inc. Method and apparatus for reducing the intensity of magnetic field emissions from video display units
US5594615A (en) * 1993-05-10 1997-01-14 Mti, Inc. Method and apparatus for reducing the intensity of magenetic field emissions from display device
EP0880311A1 (en) * 1996-10-04 1998-11-25 Matsushita Electric Industrial Co., Ltd. Electromagnetic field shielding device
EP0924749A2 (en) * 1997-12-22 1999-06-23 Nec Corporation Magnetic shield apparatus
JP2007129049A (en) * 2005-11-02 2007-05-24 Takenaka Komuten Co Ltd Magnetic shield room

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0516133B2 (en) * 1985-09-13 1993-03-03 Mitsubishi Electric Corp
JPS6264024A (en) * 1985-09-13 1987-03-20 Mitsubishi Electric Corp Unnecessary radiation preventer
JPS6262751U (en) * 1985-10-08 1987-04-18
JPS6293841A (en) * 1985-10-17 1987-04-30 Mitsubishi Electric Corp Unnecessary radiation preventing device
JPS62100935A (en) * 1985-10-25 1987-05-11 フィリップス　エレクトロニクス　ネムローゼ　フェンノートシャップ Image display device
JPS6273454U (en) * 1985-10-28 1987-05-11
JP2563917B2 (en) * 1986-03-07 1996-12-18 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ Cathode ray tube device
JPS62223952A (en) * 1986-03-07 1987-10-01 フィリップス　エレクトロニクス　ネムローゼ　フェンノートシャップ Method and apparatus for reducing straying magnetic field
JPS62211840A (en) * 1986-03-12 1987-09-17 Mitsubishi Electric Corp Useless radiation preventer
JPS62211839A (en) * 1986-03-12 1987-09-17 Mitsubishi Electric Corp Useless radiation preventer
JPS6326928A (en) * 1986-07-18 1988-02-04 Denki Onkyo Co Ltd Deflection yoke device
JPS6364250A (en) * 1986-09-05 1988-03-22 Denki Onkyo Co Ltd Deflection yoke device
JPS6365944U (en) * 1986-10-17 1988-04-30
JPS63202826A (en) * 1987-02-18 1988-08-22 Denki Onkyo Co Ltd Deflecting yoke device
US5296267A (en) * 1991-01-22 1994-03-22 Toho-Aen Kabushikigaisha Process for preparing non-amalgamated zinc alloy powder for alkali dry cells
US5139900A (en) * 1991-03-12 1992-08-18 Sanyo-Denki Kabushikigaisha Zinc alkaline cells
US5198315A (en) * 1991-03-12 1993-03-30 Sanyo-Ekuseru Kabushikigaisha Zinc alkaline cells
US5209995A (en) * 1991-03-12 1993-05-11 Sanyo-Denki Kabushikigaisha Zinc alkaline cells
US5561333A (en) * 1993-05-10 1996-10-01 Mti, Inc. Method and apparatus for reducing the intensity of magnetic field emissions from video display units
US5594615A (en) * 1993-05-10 1997-01-14 Mti, Inc. Method and apparatus for reducing the intensity of magenetic field emissions from display device
EP0880311A1 (en) * 1996-10-04 1998-11-25 Matsushita Electric Industrial Co., Ltd. Electromagnetic field shielding device
EP0880311B1 (en) * 1996-10-04 2004-04-14 Matsushita Electric Industrial Co., Ltd. Electromagnetic field shielding device
EP0924749A2 (en) * 1997-12-22 1999-06-23 Nec Corporation Magnetic shield apparatus
US6265723B1 (en) 1997-12-22 2001-07-24 Nec Corporation Magnetic shield apparatus
EP0924749A3 (en) * 1997-12-22 2002-10-02 Nec Corporation Magnetic shield apparatus
JP2007129049A (en) * 2005-11-02 2007-05-24 Takenaka Komuten Co Ltd Magnetic shield room

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Publication number Publication date
JPH0256840B2 (en) 1990-12-03

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