CN100444290C - 多环无极面永久磁铁 - Google Patents

多环无极面永久磁铁 Download PDF

Info

Publication number
CN100444290C
CN100444290C CNB2004100824436A CN200410082443A CN100444290C CN 100444290 C CN100444290 C CN 100444290C CN B2004100824436 A CNB2004100824436 A CN B2004100824436A CN 200410082443 A CN200410082443 A CN 200410082443A CN 100444290 C CN100444290 C CN 100444290C
Authority
CN
China
Prior art keywords
permanent magnet
imaging
base portion
matrix
assembly
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 - Fee Related
Application number
CNB2004100824436A
Other languages
English (en)
Chinese (zh)
Other versions
CN1602805A (zh
Inventor
凯瑟琳·M·阿姆
伊万杰洛斯文·T·拉斯卡里斯
保罗·S·汤普森
布伦特·阿克塞尔
布鲁斯·C·阿姆
小迈克尔·A·帕尔莫
约翰尼斯·M·范奥尔特
黄贤睿
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of CN1602805A publication Critical patent/CN1602805A/zh
Application granted granted Critical
Publication of CN100444290C publication Critical patent/CN100444290C/zh
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/128—Encapsulating, encasing or sealing
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/0273—Imparting anisotropy
    • H01F41/028—Radial anisotropy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
CNB2004100824436A 2003-09-29 2004-09-22 多环无极面永久磁铁 Expired - Fee Related CN100444290C (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/672,658 US7423431B2 (en) 2003-09-29 2003-09-29 Multiple ring polefaceless permanent magnet and method of making
US10/672,658 2003-09-29

Publications (2)

Publication Number Publication Date
CN1602805A CN1602805A (zh) 2005-04-06
CN100444290C true CN100444290C (zh) 2008-12-17

Family

ID=34376435

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2004100824436A Expired - Fee Related CN100444290C (zh) 2003-09-29 2004-09-22 多环无极面永久磁铁

Country Status (4)

Country Link
US (1) US7423431B2 (enExample)
JP (1) JP4758629B2 (enExample)
CN (1) CN100444290C (enExample)
IT (1) ITMI20041679A1 (enExample)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101031238B (zh) * 2004-09-30 2010-07-28 日立金属株式会社 Mri用磁场发生装置
US8395468B2 (en) * 2006-01-04 2013-03-12 University Of Utah Research Foundation High field strength magentic field generation system and associated methods
US7710081B2 (en) 2006-10-27 2010-05-04 Direct Drive Systems, Inc. Electromechanical energy conversion systems
CN101388271A (zh) * 2007-09-14 2009-03-18 Ge医疗系统环球技术有限公司 磁体系统和mri设备
EP2511724B1 (en) * 2008-06-24 2019-03-13 Alberta Health Services Method of defining a magnetic field for an imaging volume
US8183734B2 (en) 2008-07-28 2012-05-22 Direct Drive Systems, Inc. Hybrid winding configuration of an electric machine
EP2453250B1 (en) * 2009-06-30 2019-06-12 Aspect Imaging Ltd. A cage in an magnetic resonance device with a fastening/attenuating system
DE102009031665B4 (de) * 2009-07-05 2016-02-25 Msm Krystall Gbr (Vertretungsberechtigte Gesellschafter: Dr. Rainer Schneider, 12165 Berlin; Arno Mecklenburg, 10999 Berlin) Elektrodynamischer Aktor
US10224742B2 (en) 2015-01-18 2019-03-05 Powerpath Technologies Incorporated High efficiency uninterruptible power supply with near loss-less ultrafast electromechanical switching
JP2019508879A (ja) 2016-01-25 2019-03-28 ユーティー−バッテル・エルエルシー 選択的な表面改質を有するネオジム−鉄−ボロン磁石およびその製造方法
US11988730B2 (en) 2016-08-08 2024-05-21 Aspect Imaging Ltd. Device, system and method for obtaining a magnetic measurement with permanent magnets
US11287497B2 (en) 2016-08-08 2022-03-29 Aspect Imaging Ltd. Device, system and method for obtaining a magnetic measurement with permanent magnets
US10224135B2 (en) 2016-08-08 2019-03-05 Aspect Imaging Ltd. Device, system and method for obtaining a magnetic measurement with permanent magnets
US10627464B2 (en) 2016-11-22 2020-04-21 Hyperfine Research, Inc. Low-field magnetic resonance imaging methods and apparatus
MX2019005955A (es) 2016-11-22 2019-07-10 Hyperfine Res Inc Sistemas y metodos para deteccion automatizada en imagenes de resonancia magnetica.
US10847294B2 (en) 2017-07-10 2020-11-24 Aspect Imaging Ltd. System for generating a magnetic field
KR20210013563A (ko) * 2018-05-21 2021-02-04 하이퍼파인 리서치, 인크. 자기 공명 이미징 시스템을 위한 b0 자석 방법들 및 장치들
KR20210096188A (ko) 2018-11-29 2021-08-04 엡시타우 엘티디. 혼합 위상 자석 고리들을 갖춘 경량 비대칭 자석 배열체들
KR20210096189A (ko) 2018-11-29 2021-08-04 엡시타우 엘티디. 세타 자석 고리들을 갖춘 경량 비대칭 자석 배열체들
WO2020109894A1 (en) 2018-11-29 2020-06-04 Epsitau Ltd. Lightweight asymmetric magnet arrays
CN119949800A (zh) * 2023-10-30 2025-05-09 西安大医集团股份有限公司 磁共振成像引导的放疗系统及磁共振成像设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777464A (en) * 1986-09-27 1988-10-11 Sumitomo Special Metal Co., Ltd. Magnetic field generating device for NMR-CT
US5134374A (en) * 1989-06-01 1992-07-28 Applied Superconetics Magnetic field control apparatus
US5332971A (en) * 1990-07-30 1994-07-26 Universite Joseph Fourier Permanent magnet for nuclear magnetic resonance imaging equipment
JPH0945520A (ja) * 1995-07-27 1997-02-14 Hitachi Medical Corp 磁気共鳴イメージング装置に用いる超電導磁石装置およびそれを用いた磁気共鳴イメージング装置
CN2404130Y (zh) * 1999-12-01 2000-11-01 深圳市万济高科技产业投资发展有限公司 用于磁共振成像系统的磁体装置
CN1272774A (zh) * 1998-06-19 2000-11-08 住友特殊金属株式会社 Mri用磁场发生装置
JP2003235824A (ja) * 2002-02-14 2003-08-26 Shin Etsu Chem Co Ltd Ｍｒｉ用磁界発生装置

Family Cites Families (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899762A (en) 1974-10-03 1975-08-12 Permag Magnetics Corp Permanent magnetic structure
US4496395A (en) 1981-06-16 1985-01-29 General Motors Corporation High coercivity rare earth-iron magnets
US4540453A (en) 1982-10-28 1985-09-10 At&T Technologies Magnetically soft ferritic Fe-Cr-Ni alloys
JPH03170643A (ja) 1983-08-04 1991-07-24 Sumitomo Special Metals Co Ltd 永久磁石用合金
US4672346A (en) 1984-04-11 1987-06-09 Sumotomo Special Metal Co., Ltd. Magnetic field generating device for NMR-CT
US4667123A (en) 1985-11-20 1987-05-19 The Garrett Corporation Two pole permanent magnet rotor construction for toothless stator electrical machine
US4679022A (en) 1985-12-27 1987-07-07 Sumitomo Special Metal Co. Ltd. Magnetic field generating device for NMR-CT
US4827235A (en) 1986-07-18 1989-05-02 Kabushiki Kaisha Toshiba Magnetic field generator useful for a magnetic resonance imaging instrument
US4931760A (en) 1986-10-08 1990-06-05 Asahi Kasei Kogyo Kabushiki Kaisha Uniform magnetic field generator
JPS63241905A (ja) 1987-03-27 1988-10-07 Sumitomo Special Metals Co Ltd 磁界発生装置
US5320103A (en) 1987-10-07 1994-06-14 Advanced Techtronics, Inc. Permanent magnet arrangement
US5063934A (en) 1987-10-07 1991-11-12 Advanced Techtronics, Inc. Permanent magnet arrangement
US4998976A (en) 1987-10-07 1991-03-12 Uri Rapoport Permanent magnet arrangement
US4953555A (en) 1987-10-20 1990-09-04 The United States Of Americas As Represented By The Secretary Of The Army Permanent magnet structure for a nuclear magnetic resonance imager for medical diagnostics
JPH02141501A (ja) 1988-11-22 1990-05-30 Tdk Corp 永久磁石用合金粉末
JPH03131234A (ja) 1989-07-07 1991-06-04 Sumitomo Special Metals Co Ltd Ｍｒｉ用磁界発生装置
GB9009579D0 (en) 1990-04-27 1990-06-20 Oxford Advanced Tech Magnetic field generating assembly
US5252924A (en) 1991-11-18 1993-10-12 Sumitomo Special Metals Co., Ltd. Magnetic field generating apparatus for MRI
JP2808198B2 (ja) 1990-07-02 1998-10-08 住友特殊金属株式会社 Ｍｒｉ用磁界発生装置とその製法
DE69129687T2 (de) 1990-09-29 1999-03-11 Sumitomo Special Metals Co., Ltd., Osaka Vorrichtung zur Erzeugung eines Magnetfeldes für die Bildgebung mittels magnetischer Resonanz
JP2816256B2 (ja) 1991-03-25 1998-10-27 株式会社日立製作所 コイル体
DE69131940T2 (de) 1991-11-15 2000-08-17 Hitachi Medical Corp., Tokio/Tokyo Apparat zur Erzeugung von Magnetfeldern für die Bildgebung mittels magnetischer Resonanz
JP2767659B2 (ja) 1991-12-17 1998-06-18 信越化学工業株式会社 磁場発生装置
DE69318998T2 (de) 1992-02-15 1998-10-15 Santoku Metal Ind Legierungsblock für einen Dauermagnet, anisotropes Pulver für einen Dauermagnet, Verfahren zur Herstellung eines solchen und Dauermagneten
IL106779A0 (en) 1992-09-11 1993-12-08 Magna Lab Inc Permanent magnetic structure
FR2704975B1 (fr) 1993-05-03 1995-06-23 Commissariat Energie Atomique Structure d'aimant permanent pour la production d'une induction magnétique stable et homogène dans un volume donné.
DE69419096T2 (de) 1993-09-29 1999-10-28 Oxford Magnet Technology Ltd., Eynsham Verbesserungen an Magneten der Bilderzeugung mittels magnetischer Resonanz
JPH0831635A (ja) 1994-07-08 1996-02-02 Sumitomo Special Metals Co Ltd Ｍｒｉ用磁界発生装置
DE4424580C2 (de) * 1994-07-13 1996-09-05 Bruker Analytische Messtechnik NMR-Scheibenspule
JP3014319B2 (ja) 1996-04-12 2000-02-28 信越化学工業株式会社 磁石対向型永久磁石回路
US6150911A (en) * 1996-07-24 2000-11-21 Odin Technologies Ltd. Yoked permanent magnet assemblies for use in medical applications
US5900793A (en) * 1997-07-23 1999-05-04 Odin Technologies Ltd Permanent magnet assemblies for use in medical applications
JPH10174681A (ja) 1996-12-17 1998-06-30 Shin Etsu Chem Co Ltd 永久磁石磁気回路
IT1294051B1 (it) 1997-04-29 1999-03-15 Esaote Spa Struttura magnetica per la generazione di campi magnetici adatti all'uso nel rilevamento d'immagine in risonanza magnetica nucleare
US6411187B1 (en) * 1997-07-23 2002-06-25 Odin Medical Technologies, Ltd. Adjustable hybrid magnetic apparatus
US6157278A (en) * 1997-07-23 2000-12-05 Odin Technologies Ltd. Hybrid magnetic apparatus for use in medical applications
WO1999015914A1 (en) * 1997-09-25 1999-04-01 Odin Technologies Ltd. Magnetic apparatus for mri
JPH11127561A (ja) 1997-10-22 1999-05-11 Denso Corp 磁石併用型回転電機の回転子及びその製造方法
IT1298022B1 (it) 1997-12-05 1999-12-20 Esaote Spa Magnete permanente per il rilevamento d'immagini in risonaza magnetica nucleare.
US6163154A (en) * 1997-12-23 2000-12-19 Magnetic Diagnostics, Inc. Small scale NMR spectroscopic apparatus and method
EP0965305B1 (en) 1997-12-26 2007-03-21 Neomax Co., Ltd. Mri magnetic field generator
US6255670B1 (en) 1998-02-06 2001-07-03 General Electric Company Phosphors for light generation from light emitting semiconductors
EP1058933A4 (en) * 1998-02-09 2006-03-01 Odin Medical Technologies Ltd CONSTRUCTION PROCEDURE OF OPEN MAGNETS AND OPEN MAGNETIC DEVICE FOR MRI / MRI SENSORS
IT1305960B1 (it) 1998-05-11 2001-05-21 Esaote Spa Struttura di magnete in particolare per macchine per il rilevamentod'immagine in risonanza magnetica nucleare.
US6281775B1 (en) 1998-09-01 2001-08-28 Uri Rapoport Permanent magnet arrangement with backing plate
GB2341447B (en) 1998-09-11 2003-08-20 Oxford Magnet Tech Temperature control system for a permanent magnetic mri system
US5942962A (en) 1998-10-02 1999-08-24 Quadrant Technology Dipole magnetic structure for producing uniform magnetic field
US6259252B1 (en) 1998-11-24 2001-07-10 General Electric Company Laminate tile pole piece for an MRI, a method manufacturing the pole piece and a mold bonding pole piece tiles
US6120620A (en) 1999-02-12 2000-09-19 General Electric Company Praseodymium-rich iron-boron-rare earth composition, permanent magnet produced therefrom, and method of making
CN1251252C (zh) 1999-02-12 2006-04-12 通用电气公司 含有铈、钕和/或镨的铁－硼－稀土型永磁材料及其生产方法
US6489872B1 (en) 1999-05-06 2002-12-03 New Mexico Resonance Unilateral magnet having a remote uniform field region for nuclear magnetic resonance
KR100319923B1 (ko) 1999-05-10 2002-01-09 윤종용 자기공명영상장치용 자기장 발생 장치
US6429861B1 (en) * 1999-08-03 2002-08-06 Acuson Corporation Method and apparatus for editing 3-D medical diagnostic ultrasound images
GB2400916B (en) * 1999-10-29 2004-12-29 Oxford Magnet Tech Improved magnet
DE60041792D1 (de) 1999-11-16 2009-04-23 Hitachi Metals Ltd Magnetfeldgenerator mit einer Polstückeinheit
US6467157B1 (en) 2000-01-26 2002-10-22 Odin Technologies, Ltd. Apparatus for construction of annular segmented permanent magnet
US6335670B1 (en) * 2000-04-14 2002-01-01 Marconi Medical Systems Finland, Inc. Mri system with split rose ring with high homogeneity
US20030011451A1 (en) 2000-08-22 2003-01-16 Ehud Katznelson Permanent magnet assemblies for use in medical applications
US6448772B1 (en) 2000-10-06 2002-09-10 Sumitomo Special Metals Co., Ltd. Magnetic field adjusting apparatus, magnetic field adjusting method and recording medium
US6518754B1 (en) 2000-10-25 2003-02-11 Baker Hughes Incorporated Powerful bonded nonconducting permanent magnet for downhole use
US6670877B2 (en) * 2001-01-25 2003-12-30 Uri Rapoport Field adjusting mechanisms and methods for permanent magnet arrangement with backplate
US6518867B2 (en) * 2001-04-03 2003-02-11 General Electric Company Permanent magnet assembly and method of making thereof
US7148689B2 (en) * 2003-09-29 2006-12-12 General Electric Company Permanent magnet assembly with movable permanent body for main magnetic field adjustable

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777464A (en) * 1986-09-27 1988-10-11 Sumitomo Special Metal Co., Ltd. Magnetic field generating device for NMR-CT
US5134374A (en) * 1989-06-01 1992-07-28 Applied Superconetics Magnetic field control apparatus
US5332971A (en) * 1990-07-30 1994-07-26 Universite Joseph Fourier Permanent magnet for nuclear magnetic resonance imaging equipment
JPH0945520A (ja) * 1995-07-27 1997-02-14 Hitachi Medical Corp 磁気共鳴イメージング装置に用いる超電導磁石装置およびそれを用いた磁気共鳴イメージング装置
CN1272774A (zh) * 1998-06-19 2000-11-08 住友特殊金属株式会社 Mri用磁场发生装置
CN2404130Y (zh) * 1999-12-01 2000-11-01 深圳市万济高科技产业投资发展有限公司 用于磁共振成像系统的磁体装置
JP2003235824A (ja) * 2002-02-14 2003-08-26 Shin Etsu Chem Co Ltd Ｍｒｉ用磁界発生装置

Also Published As

Publication number Publication date
CN1602805A (zh) 2005-04-06
US7423431B2 (en) 2008-09-09
ITMI20041679A1 (it) 2004-11-30
JP4758629B2 (ja) 2011-08-31
US20050068138A1 (en) 2005-03-31
JP2005109487A (ja) 2005-04-21

Similar Documents

Publication Publication Date Title
CN100444290C (zh) 多环无极面永久磁铁
US6518867B2 (en) Permanent magnet assembly and method of making thereof
JP4630617B2 (ja) 主磁場調整のための移動可能永久磁石本体を備えた永久磁石アセンブリ
US7345560B2 (en) Method and apparatus for magnetizing a permanent magnet
JP2808198B2 (ja) Ｍｒｉ用磁界発生装置とその製法
US20030234711A1 (en) Apparatus, device and method for generating magnetic field gradient
KR100373577B1 (ko) 자기 공명 촬영 장치용 자계 발생 장치
US5252924A (en) Magnetic field generating apparatus for MRI
JP2025098139A (ja) 混合相磁石リングを備える軽量の非対称磁石アレイ
JP2016029880A (ja) 磁石ユニット及び磁石ユニットの製造方法
JP2005118559A (ja) 磁性材料、パッシブ・シム及び磁気共鳴イメージング・システム
JP2764458B2 (ja) Ｍｒｉ用磁界発生装置
EP0541872B1 (en) Magnetic field generating apparatus for MRI
JP3151129B2 (ja) 磁石対向型永久磁石磁気回路とその磁場調整方法
US20050062572A1 (en) Permanent magnet alloy for medical imaging system and method of making
USRE35565E (en) Magnetic field generating apparatus for MRI
JP3194699B2 (ja) 永久磁石磁気回路
JP2004128302A (ja) 希土類焼結磁石
JPH0563085B2 (enExample)
JP4926834B2 (ja) ラジアル異方性リング磁石の製造装置
JP2023094825A (ja) 配向装置、成形体の製造方法、着磁装置、磁石の製造方法および空芯コイル
JPH05167127A (ja) 磁歪素子
JPH03203203A (ja) Ｍｒｉ用磁界発生装置
JPH0799924B2 (ja) ボイスコイル型リニアモータ
JPH0547558A (ja) 着磁装置およびそれを用いた永久磁石の着磁方法

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20081217

Termination date: 20170922

CF01 Termination of patent right due to non-payment of annual fee