JPH0383903U - - Google Patents

Info

Publication number
JPH0383903U
JPH0383903U JP1989143987U JP14398789U JPH0383903U JP H0383903 U JPH0383903 U JP H0383903U JP 1989143987 U JP1989143987 U JP 1989143987U JP 14398789 U JP14398789 U JP 14398789U JP H0383903 U JPH0383903 U JP H0383903U
Authority
JP
Japan
Prior art keywords
magnetic pole
pair
pole piece
permanent magnets
shaped
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
JP1989143987U
Other languages
English (en)
Other versions
JP2533758Y2 (ja
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 filed Critical
Priority to JP1989143987U priority Critical patent/JP2533758Y2/ja
Priority to EP90123905A priority patent/EP0432750B1/en
Priority to DE69030715T priority patent/DE69030715T2/de
Priority to US07/627,145 priority patent/US5089798A/en
Publication of JPH0383903U publication Critical patent/JPH0383903U/ja
Application granted granted Critical
Publication of JP2533758Y2 publication Critical patent/JP2533758Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/383—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/387—Compensation of inhomogeneities
    • G01R33/3873—Compensation of inhomogeneities using ferromagnetic bodies ; Passive shimming

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Description

【図面の簡単な説明】
添付の図面は本考案を説明するための概略側面
図である。 図中、１０，１２…継鉄、１４，１６…永久磁
石、１８，２０…磁極片、２２，２４…磁極片の
一部を構成する環状突起、３０…磁界調整用の小
鉄球を示す。

Claims (1)

  1. 【実用新案登録請求の範囲】 (1) 厚み方向に磁化され、継鉄枠内面に対向し
    て配置された１対の円板状或いはリング状永久磁
    石と、 該１対の永久磁石の対向面の夫々に設けられ環
    状突起を有する磁極片と、 該磁極片の表面に設けた複数の鉄球とを備えた
    ことを特徴とする磁場発生装置。 (2) 上記鉄球は直径が５mm以下である実用新案
    登録請求の範囲第１項に記載の装置。
JP1989143987U 1989-12-13 1989-12-13 磁場発生装置 Expired - Lifetime JP2533758Y2 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP1989143987U JP2533758Y2 (ja) 1989-12-13 1989-12-13 磁場発生装置
EP90123905A EP0432750B1 (en) 1989-12-13 1990-12-12 Apparatus for generating uniform magnetic field using small diameter spherical metallic members provided on magnetic poles
DE69030715T DE69030715T2 (de) 1989-12-13 1990-12-12 Apparat zur Erzeugung eines gleichförmigen Magnetfeldes unter Verwendung von sphärischen Metallteilen kleinen Durchmessers auf den Magnetpolen
US07/627,145 US5089798A (en) 1989-12-13 1990-12-13 Apparatus for generating uniform magnetic field using small diameter spherical metallic members provided on magnetic poles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1989143987U JP2533758Y2 (ja) 1989-12-13 1989-12-13 磁場発生装置

Publications (2)

Publication Number Publication Date
JPH0383903U true JPH0383903U (ja) 1991-08-26
JP2533758Y2 JP2533758Y2 (ja) 1997-04-23

Family

ID=15351672

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1989143987U Expired - Lifetime JP2533758Y2 (ja) 1989-12-13 1989-12-13 磁場発生装置

Country Status (4)

Country Link
US (1) US5089798A (ja)
EP (1) EP0432750B1 (ja)
JP (1) JP2533758Y2 (ja)
DE (1) DE69030715T2 (ja)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5285393A (en) * 1991-11-19 1994-02-08 New York University Method for determination of optimum fields of permanent magnet structures with linear magnetic characteristics
JP2767659B2 (ja) * 1991-12-17 1998-06-18 信越化学工業株式会社 磁場発生装置
JP3123731B2 (ja) * 1993-02-19 2001-01-15 株式会社日立メディコ 磁気共鳴イメージング装置の磁界発生装置
JP2757104B2 (ja) * 1993-04-01 1998-05-25 信越化学工業株式会社 磁場発生装置
GB2276946B (en) * 1993-04-08 1997-04-02 Oxford Magnet Tech Improvements in or relating to MRI magnets
JPH07106155A (ja) * 1993-05-26 1995-04-21 General Electric Co <Ge> Ｃ字形超伝導磁石
FI933834A (fi) * 1993-09-01 1995-03-02 Picker Nordstar Oy Magneettikuvauslaitteen napakenkä
EP0645641B1 (en) * 1993-09-29 1999-06-16 Oxford Magnet Technology Limited Improvements in or relating to MRI magnets
GB9320043D0 (en) * 1993-09-29 1993-11-17 Oxford Magnet Rechnology Limit Improvements in or relating to mri magnets
DE69613061T2 (de) * 1995-08-28 2001-10-31 Shinetsu Chemical Co Magnetkreisanordnung mit einander gegenüberliegenden Permanentmagneten
US6163154A (en) 1997-12-23 2000-12-19 Magnetic Diagnostics, Inc. Small scale NMR spectroscopic apparatus and method
US5942962A (en) * 1998-10-02 1999-08-24 Quadrant Technology Dipole magnetic structure for producing uniform magnetic field
US6124710A (en) * 1998-11-13 2000-09-26 Cts Corporation Rotary magnetic encoder using hall effect for detecting revolution of a shaft
US6288534B1 (en) 1999-02-10 2001-09-11 Cts Corporation Non-contacting throttle valve position sensor
WO2001053847A1 (en) 2000-01-19 2001-07-26 Millennium Technology Inc. C-shaped magnetic resonance imaging system
US6566991B1 (en) * 2001-04-24 2003-05-20 Fonar Corporation Apparatus and method of shimming a magnetic field
US6778054B1 (en) * 2003-10-03 2004-08-17 General Electric Company Methods and apparatus for passive shimming of magnets
JP2005168692A (ja) * 2003-12-10 2005-06-30 Shin Etsu Chem Co Ltd 永久磁石対向型磁気回路およびその磁場を調整する方法
US20210110966A1 (en) * 2019-10-09 2021-04-15 Power Integrations, Inc. Magnet with multiple discs

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60166111U (ja) * 1984-04-11 1985-11-05 住友特殊金属株式会社 磁界発生装置
JPS60239005A (ja) * 1984-05-11 1985-11-27 Sumitomo Special Metals Co Ltd 磁界発生装置
JPH01164356A (ja) * 1987-12-22 1989-06-28 Asahi Chem Ind Co Ltd 均一磁界の発生装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0114889A1 (en) * 1982-08-04 1984-08-08 OLDENDORF, William H. Adjustable magnet suitable for in vivo nmr imaging and method of adjusting the same
US4672346A (en) * 1984-04-11 1987-06-09 Sumotomo Special Metal Co., Ltd. Magnetic field generating device for NMR-CT
DE3518852A1 (de) * 1985-05-23 1986-11-27 Siemens AG, 1000 Berlin und 8000 München Magnet eines kernspintomographen
DE3779715T2 (de) * 1986-09-27 1993-01-28 Sumitomo Spec Metals Vorrichtung zur erzeugung eines magnetfeldes fuer rechnergesteuerte tomographie mittels magnetischer kernresonanz.
DE3866060D1 (de) * 1987-08-14 1991-12-12 Siemens Ag Elektrischer magnet fuer kernspin-thomographen.
JPH03131234A (ja) * 1989-07-07 1991-06-04 Sumitomo Special Metals Co Ltd Ｍｒｉ用磁界発生装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60166111U (ja) * 1984-04-11 1985-11-05 住友特殊金属株式会社 磁界発生装置
JPS60239005A (ja) * 1984-05-11 1985-11-27 Sumitomo Special Metals Co Ltd 磁界発生装置
JPH01164356A (ja) * 1987-12-22 1989-06-28 Asahi Chem Ind Co Ltd 均一磁界の発生装置

Also Published As

Publication number Publication date
DE69030715T2 (de) 1997-11-27
JP2533758Y2 (ja) 1997-04-23
US5089798A (en) 1992-02-18
EP0432750B1 (en) 1997-05-14
DE69030715D1 (de) 1997-06-19
EP0432750A2 (en) 1991-06-19
EP0432750A3 (en) 1991-11-06

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