公开(公告)号：USD438619S1

公开(公告)日：2001-03-06

申请号：US29107120

申请日：1999-06-25

申请人： Shigemasu Okada ,  Masaaki Aoki ,  Shigeo Hashimoto

设计人： Shigemasu Okada ,  Masaaki Aoki ,  Shigeo Hashimoto

公开(公告)号：US5317297A

公开(公告)日：1994-05-31

申请号：US141701

申请日：1993-10-26

申请人： Leon Kaufman ,  Joseph W. Carlson ,  Shigemasu Okada ,  Shigeo Hashimoto

发明人： Leon Kaufman ,  Joseph W. Carlson ,  Shigemasu Okada ,  Shigeo Hashimoto

IPC分类号： A61B5/055 ,  G01R33/20 ,  G01R33/38 ,  G01R33/381 ,  G01R33/383 ,  G01R33/385 ,  H01F3/00

CPC分类号： B82Y15/00 ,  G01R33/383 ,  G01R33/385

摘要： An MRI magnet member (e.g., a pole piece or tip) is laminated using relatively large bar-shaped laminations instead of the usual thin sheet material. One or more layers of such bar-shaped laminations are arrayed with small insulating gaps into which a low loss insulating liquid filler material is flowed and then cured to a hardened solid state. This simultaneously produces insulated pole tip laminations which have been robustly integrated together into a unitary structure. The resulting robust laminated pole tip is relatively easy to manufacture and is also capable of withstanding rather large magnetic forces and maintaining relatively uniform magnetic field distribution within an MRI imaging region while yet providing providing sufficient eddy current reduction so as to efficiently permit rapidly changing magnetic gradient coil currents to be established.

摘要翻译： 使用相对较大的棒状叠片而不是通常的薄片材料层叠MRI磁体构件（例如，极片或尖端）。 这种棒状叠片的一层或多层排列有小的绝缘间隙，低损失绝缘液体填充材料流入其中，然后固化至硬化固体状态。 这同时产生绝缘极尖叠片，它们已经牢固地集成在一起成为一体的结构。 所得到的坚固的层叠极尖相对容易制造，并且还能够承受相当大的磁力并且在MRI成像区域内保持相对均匀的磁场分布，同时还提供足够的涡流减少以便有效地允许快速变化的磁梯度 线圈电流要建立。

公开(公告)号：US07796002B2

公开(公告)日：2010-09-14

申请号：US11664261

申请日：2004-09-30

申请人： Shigeo Hashimoto ,  Masaaki Aoki

发明人： Shigeo Hashimoto ,  Masaaki Aoki

IPC分类号： H01F7/02

CPC分类号： G01R33/3802 ,  G01R33/3806 ,  G01R33/383

摘要： There is provided a magnetic field generator for MRI 10 applicable to a variety of magnetic field generators, and capable of preventing separation of permanent magnets 20 which constitute permanent magnet groups 14a, 14b. The magnetic field generator for MRI 10 includes a pair of permanent magnet groups 14a, 14b. The pair of permanent magnet groups 14a, 14b each including a plurality of permanent magnets 20 bonded to each other, are opposed to each other with a space in between. The permanent magnet groups 14a, 14b have projections 18 projecting more outward than the area of contact with respective pole pieces 16a, 16b. A flange-shaped member 34 is attached to each outer circumferential surface of the pole pieces 16a, 16b, covering a space-facing surface 18a of the projection 18.

摘要翻译： 提供了一种用于MRI 10的磁场发生器，其适用于各种磁场发生器，并且能够防止构成永磁体组14a，14b的永磁体20的分离。 用于MRI 10的磁场发生器包括一对永磁体组14a，14b。 一对永久磁铁组14a，14b，每一个包括彼此结合的多个永久磁铁20，彼此相对，并具有间隔。 永久磁体组14a，14b具有比与各个极片16a，16b接触的区域更向外突出的突出部18。 凸缘状构件34安装在极靴16a，16b的每个外圆周表面上，覆盖凸起18的面向空间的表面18a。

公开(公告)号：US06340888B1

公开(公告)日：2002-01-22

申请号：US09386146

申请日：1999-08-31

申请人： Masaaki Aoki ,  Shigeo Hashimoto

发明人： Masaaki Aoki ,  Shigeo Hashimoto

IPC分类号： G01V300

CPC分类号： G01R33/383 ,  G01R33/3873

摘要： A magnetic field generator for MRI comprises a pair of plate yokes opposed to each other with space in between. A magnet is provided in each of the opposed surfaces of the pair of plate yokes. A column yoke is connected to the pair of plate yokes. An enhancing member made of magnetic material and having a curved slant face is provided in an inner surface of the connection between the column yoke and the plate yokes at a place farthest from the magnet. A first bolt of magnetic field adjusting bolts is screwed into the plate yoke, with a tip of the first bolt contacting the enhancing member. A second bolt of the magnetic field adjusting bolts is screwed into the plate yoke, with a tip of the second bolt contacting an upper end face of the column yoke. An engaging portion for engagement of the enhancing member with the yoke may be provided.

摘要翻译： 用于MRI的磁场发生器包括彼此相对的一对板状轭铁，其间具有空间。 在一对板状轭铁的相对面的每一个上设置有磁铁。 列轭连接到一对板轭。 磁性材料制成的具有弯曲倾斜面的增强部件设置在柱磁轭与板状磁轭之间的距离磁体最远处的连接的内表面。 第一螺栓的磁场调节螺栓被拧入板轭中，第一螺栓的尖端与增强构件接触。 磁场调节螺栓的第二螺栓被拧入板轭中，第二螺栓的尖端接触柱轭的上端面。 可以提供用于将增强构件与轭架接合的接合部分。

公开(公告)号：US06336989B1

公开(公告)日：2002-01-08

申请号：US09366563

申请日：1999-08-04

申请人： Masaaki Aoki ,  Shigeo Hashimoto

发明人： Masaaki Aoki ,  Shigeo Hashimoto

IPC分类号： H01F4102

CPC分类号： G01R33/3806 ,  G01R33/3802 ,  G01R33/383 ,  Y10T29/49002 ,  Y10T29/4902 ,  Y10T29/49073 ,  Y10T29/49075 ,  Y10T29/49901 ,  Y10T29/49902 ,  Y10T156/1089

摘要： A plate yoke has an upper surface formed with a projection and a guiding rail. A new magnet block is transported by sliding on the upper surface of the plate yoke, and is bonded side by side with the projection or a magnet block which is already fixed. During the above operation, a magnetic member is held above the plate yoke. Preferably, the new magnet block is transported toward a corner portion, with side surfaces of the magnet block held parallel to a side surface of the projection and a side surface of the guiding rail respectively. When the magnet unit and the column yoke is connected, the column yoke or the magnet unit is lowered so that a guiding rod attached to an end face of the column yoke is inserted into a hole formed in the magnetic unit. Further, the column yoke is guided by a guiding member disposed between a permanent magnet on the plate yoke and a position where the column yoke is to be connected on the plate yoke.

摘要翻译： 板状轭铁具有形成有突起和导轨的上表面。 新的磁体块通过滑动在板状轭铁的上表面上运动，并且与已经固定的突起或磁体块并排地并入。 在上述操作期间，磁性部件保持在板状轭铁的上方。 优选地，将新的磁体块朝向拐角部分传送，磁体块的侧表面分别保持平行于突起的侧表面和导轨的侧表面。 当磁体单元和列轭连接时，柱轭或磁体单元被降低，使得附接到柱轭的端面的引导杆插入到形成在磁单元中的孔中。 此外，柱轭被设置在板轭铁上的永磁体与柱轭连接在板轭上的位置之间的引导构件引导。

公开(公告)号：US20060168799A1

公开(公告)日：2006-08-03

申请号：US11393652

申请日：2006-03-31

申请人： Masaaki Aoki ,  Shigeo Hashimoto

发明人： Masaaki Aoki ,  Shigeo Hashimoto

IPC分类号： H01F7/06 ,  H01F1/00

CPC分类号： B09B5/00 ,  G01R33/383 ,  H01F7/0278 ,  H01F7/04 ,  H01F13/006 ,  Y10T29/49009 ,  Y10T29/4902 ,  Y10T29/49075 ,  Y10T29/49753

摘要： A magnetic field generator comprises a pair of plate yokes connected by a column yoke. The pair of plate yokes has a pair of opposed surfaces each provided with a permanent magnet including a plurality of neodymium magnets. In a method in which the neodymium magnets are demagnetized and adhesive is ground, the magnetic field generator is heated to 200° C.˜350° C. After the neodymium magnets are demagnetized, the adhesive is removed and the neodymium magnets are removed and collected from the magnetic field generator. In a method in which the adhesive is carbonized, the magnetic field generator is heated. to 350° C.˜1000° C. After carbonizing the adhesive, the neodymium magnets are removed and collected. Surfaces of the collected neodymium magnets are polished and the neodymium magnets are reused. Further, the collected neodymium magnets are re-aged and reused.

摘要翻译： 磁场发生器包括由柱轭连接的一对板状轭铁。 所述一对板状轭铁具有一对相对的面，每一面具有包括多个钕磁体的永磁体。 在钕磁体被去磁并且粘合剂研磨的方法中，磁场产生器被加热到​​200℃〜350℃。在钕磁体退磁之后，去除粘合剂并且去除和收集钕磁铁 来自磁场发生器。 在粘合剂被碳化的方法中，磁场发生器被加热。 至350℃〜1000℃。在将粘合剂碳化后，去除并收集钕磁体。 所收集的钕磁体的表面被抛光，并且钕磁体被重复使用。 此外，收集的钕磁体被重新使用并重新使用。

公开(公告)号：US07065860B2

公开(公告)日：2006-06-27

申请号：US10254634

申请日：2002-09-26

申请人： Masaaki Aoki ,  Shigeo Hashimoto

发明人： Masaaki Aoki ,  Shigeo Hashimoto

IPC分类号： H01F7/06

CPC分类号： G01R33/3806 ,  G01R33/3802 ,  G01R33/383 ,  Y10T29/49002 ,  Y10T29/4902 ,  Y10T29/49073 ,  Y10T29/49075 ,  Y10T29/49901 ,  Y10T29/49902 ,  Y10T156/1089

摘要： A plate yoke has an upper surface formed with a projection and a guiding rail. A new magnet block is transported by sliding on the upper surface of the plate yoke, and is bonded side by side with the projection or a magnet block which is already fixed. During the above operation, a magnetic member is held above the plate yoke. Preferably, the new magnet block is transported toward a corner portion, with side surfaces of the magnet block held parallel to a side surface of the projection and a side surface of the guiding rail respectively. When the magnet unit and the column yoke is connected, the column yoke or the magnet unit is lowered so that a guiding rod attached to an end face of the column yoke is inserted into a hole formed in the magnetic unit. Further, the column yoke is guided by a guiding member disposed between a permanent magnet on the plate yoke and a position where the column yoke is to be connected on the plate yoke.

摘要翻译： 板状轭铁具有形成有突起和导轨的上表面。 新的磁体块通过滑动在板状轭铁的上表面上运动，并且与已经固定的突起或磁体块并排地并入。 在上述操作期间，磁性部件保持在板状轭铁的上方。 优选地，将新的磁体块朝向拐角部分传送，磁体块的侧表面分别保持平行于突起的侧表面和导轨的侧表面。 当磁体单元和列轭连接时，柱轭或磁体单元被降低，使得附接到柱轭的端面的引导杆插入到形成在磁单元中的孔中。 此外，柱轭被设置在板轭铁上的永磁体与柱轭连接在板轭上的位置之间的引导构件引导。

公开(公告)号：US20080100406A1

公开(公告)日：2008-05-01

申请号：US11664261

申请日：2004-09-30

申请人： Shigeo Hashimoto ,  Masaaki Aoki

发明人： Shigeo Hashimoto ,  Masaaki Aoki

IPC分类号： H01F7/02

CPC分类号： G01R33/3802 ,  G01R33/3806 ,  G01R33/383

摘要： There is provided a magnetic field generator for MRI 10 applicable to a variety of magnetic field generators, and capable of preventing separation of permanent magnets 20 which constitute permanent magnet groups 14a, 14b. The magnetic field generator for MRI 10 includes a pair of permanent magnet groups 14a, 14b. The pair of permanent magnet groups 14a, 14b each including a plurality of permanent magnets 20 bonded to each other, are opposed to each other with a space in between. The permanent magnet groups 14a, 14b have projections 18 projecting more outward than the area of contact with respective pole pieces 16a, 16b. A flange-shaped member 34 is attached to each outer circumferential surface of the pole pieces 16a, 16b, covering a space-facing surface 18a of the projection 18.

摘要翻译： 提供了适用于各种磁场发生器的用于MRI 10的磁场发生器，并且能够防止构成永磁体组14a，14b的永磁体20的分离。 用于MRI 10的磁场发生器包括一对永磁体组14a，14b。 每对包括彼此结合的多个永磁体20的一对永磁体组14a，14b彼此相对，并且之间具有空间。 永磁体组14a，14b具有比与各个极片16a，16b接触的区域更向外突出的突出部18。 凸缘状构件34附接到覆盖突起18的面向空间的表面18a的极靴16a，16b的每个外圆周表面上。

公开(公告)号：US07143507B2

公开(公告)日：2006-12-05

申请号：US11393652

申请日：2006-03-31

申请人： Masaaki Aoki ,  Shigeo Hashimoto

发明人： Masaaki Aoki ,  Shigeo Hashimoto

IPC分类号： H01F7/06 ,  H01F7/02

CPC分类号： B09B5/00 ,  G01R33/383 ,  H01F7/0278 ,  H01F7/04 ,  H01F13/006 ,  Y10T29/49009 ,  Y10T29/4902 ,  Y10T29/49075 ,  Y10T29/49753

摘要： A magnetic field generator comprises a pair of plate yokes connected by a column yoke. The pair of plate yokes has a pair of opposed surfaces each provided with a permanent magnet including a plurality of neodymium magnets. In a method in which the neodymium magnets are demagnetized and adhesive is ground, the magnetic field generator is heated to 200° C.˜350° C. After the neodymium magnets are demagnetized, the adhesive is removed and the neodymium magnets are removed and collected from the magnetic field generator. In a method in which the adhesive is carbonized, the magnetic field generator is heated to 350° C.˜1000° C. After carbonizing the adhesive, the neodymium magnets are removed and collected. Surfaces of the collected neodymium magnets are polished and the neodymium magnets are reused. Further, the collected neodymium magnets are re-aged and reused.

摘要翻译： 磁场发生器包括由柱轭连接的一对板状轭铁。 所述一对板状轭铁具有一对相对的面，每一面具有包括多个钕磁体的永磁体。 在钕磁体被去磁并且粘合剂研磨的方法中，磁场产生器被加热到​​200℃〜350℃。在钕磁体退磁之后，去除粘合剂并且去除和收集钕磁铁 来自磁场发生器。 在粘合剂被碳化的方法中，将磁场发生器加热至350℃〜1000℃。在粘合剂碳化之后，去除并收集钕磁体。 所收集的钕磁体的表面被抛光，并且钕磁体被重复使用。 此外，收集的钕磁体被重新使用并重新使用。

公开(公告)号：US06650214B2

公开(公告)日：2003-11-18

申请号：US09815008

申请日：2001-03-23

申请人： Masaaki Aoki ,  Shigeo Hashimoto

发明人： Masaaki Aoki ,  Shigeo Hashimoto

IPC分类号： H01F500

CPC分类号： G01R33/3806 ,  G01R33/3802 ,  G01R33/383 ,  Y10T29/49002 ,  Y10T29/4902 ,  Y10T29/49073 ,  Y10T29/49075 ,  Y10T29/49901 ,  Y10T29/49902 ,  Y10T156/1089

摘要： A plate yoke has an upper surface formed with a projection and a guiding rail. A new magnet block is transported by sliding on the upper surface of the plate yoke, and is bonded side by side with the projection or a magnet block which is already fixed. During the above operation, a magnetic member is held above the plate yoke. Preferably, the new magnet block is transported toward a corner portion, with side surfaces of the magnet block held parallel to a side surface of the projection and a side surface of the guiding rail respectively. When the magnet unit and the column yoke is connected, the column yoke or the magnet unit is lowered so that a guiding rod attached to an end face of the column yoke is inserted into a hole formed in the magnetic unit. Further, the column yoke is guided by a guiding member disposed between a permanent magnet on the plate yoke and a position where the column yoke is to be connected on the plate yoke.