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1. 发明授权

US5774034A Magnet assembly in MRI instrument 失效
标题翻译： MRI仪器中的磁铁组件
公开(公告)号：US5774034A
公开(公告)日：1998-06-30
申请号：US706349
申请日：1996-08-30
申请人： Yuhito Yoneda , Koji Miyata , Ken Ohashi , Dai Higuchi
发明人： Yuhito Yoneda , Koji Miyata , Ken Ohashi , Dai Higuchi
IPC分类号： G01R33/385 , A61B5/055 , G01R33/383 , G01R33/3873 , G01R33/565 , G01V3/00
CPC分类号： G01R33/383 , G01R33/3873 , G01R33/56518
摘要： Proposed is an improvement in a magnet assembly of an MRI instrument of the permanent magnet type comprising a pair of permanent magnets facing each other and forming a magnet gap therebetween. A pair of pole pieces each of which are mounted on one of the permanent magnets and a pair of gradient-field coils each of which are mounted on one of the pole pieces where both the pole pieces and coils face the gap. With an object of the invention to cancel the adverse influences caused by the residual magnetization of the pole pieces by the gradient magnetic field generated in the gradient-field coils. The invention proposes providing a pair of magnetic-field compensation members each on one of the gradient-field coils so that the residual magnetization in the compensation members generates a magnetic field which is compensatory for the magnetic field due to the residual magnetization in the pole pieces.
摘要翻译：提出了一种永磁体MRI仪器的磁体组件的改进，其包括彼此面对的一对永磁体，并在其间形成磁隙。一对极片安装在一个永磁体上，一对倾斜磁场线圈分别安装在磁极片之一上，两个极片和线圈都面对间隙。本发明的目的是通过在梯度场线圈中产生的梯度磁场来消除由极片的剩余磁化引起的不利影响。本发明提出在梯度场线圈中的一个上提供一对磁场补偿元件，使得补偿元件中的剩余磁化产生由于极片中的剩余磁化而导致的磁场补偿的磁场。

2. 发明授权

US5825187A Magnetic circuit system with opposite permanent magnets 失效
标题翻译：具有相对永久磁铁的磁路系统
公开(公告)号：US5825187A
公开(公告)日：1998-10-20
申请号：US843053
申请日：1997-04-11
申请人： Ken Ohashi , Yuhito Yoneda , Koji Miyata , Dai Higuchi
发明人： Ken Ohashi , Yuhito Yoneda , Koji Miyata , Dai Higuchi
IPC分类号： H01F7/02 , A61B5/055 , G01R33/383 , G01R33/3873 , G01V3/00
CPC分类号： G01R33/383 , G01R33/3873
摘要： The present invention provides is an improvement in a magnetic circuit system with a pair of opposite permanent magnets to construct an MRI instrument comprising a pair of upper and lower permanent magnets connected with yokes to form an air gap space therebetween, in which the patient under MRI inspection is kept lying, a pair of shimmed pole pieces each mounted on the permanent magnet to face the air gap and a pair of gradient coils each mounted on the shimmed pole piece to face the air gap. The improvement comprises mounting a cancellation magnetic plate, which is a thin plate of a magnetic material having a coercive force of 0.1 to 500 Oe, on the gradient coil to face the air gap with an object to cancel the residual magnetization of the shimmed pole piece by the gradient magnetic field. The cancellation magnetic plate has a thickness not exceeding 0.5 mm and has a base area which is 5 to 75% relative to the base area of the gradient coil.
摘要翻译：本发明提供了具有一对相对的永磁体的磁路系统的改进，以构造MRI仪器，其包括一对与轭架连接的上下永磁体，以在其间形成气隙空间，患者在MRI下检查保持躺着，一对分别安装在永久磁铁上以面对气隙的垫片极片和一对梯度线圈，每个梯度线圈都安装在垫片极片上以面对气隙。改进之处在于，将梯度线圈上具有矫顽力为0.1〜500Oe的磁性材料的薄板的抵消磁性板安装在与物体相对的气隙上，以抵消该偏振极片的剩余磁化强度通过梯度磁场。取消磁性板的厚度不超过0.5mm，基底面积相对于梯度线圈的基面积为5〜75％。

3. 发明授权

US06933820B2 Magnetic circuit with opposing permanent magnets and method for adjusting magnetic field thereof 失效
标题翻译：具有相对永磁体的磁路及其磁场调整方法
公开(公告)号：US06933820B2
公开(公告)日：2005-08-23
申请号：US11007982
申请日：2004-12-09
申请人： Yuhito Doi , Koji Miyata , Dai Higuchi
发明人： Yuhito Doi , Koji Miyata , Dai Higuchi
IPC分类号： G01R33/3873 , A61B5/055 , G01R33/383 , H01F7/02 , H01F7/00
CPC分类号： G01R33/383 , H01F7/0278
摘要： It is an object of the present invention to facilitate adjustment of magnetic fields. There is provided a magnetic circuit with opposing permanent magnets, comprising: a pair of permanent magnets opposing each other across a gap, the pair of permanent magnets being magnetized in thickness direction; a yoke magnetically coupled to the permanent magnets, and provided outside of the permanent magnets and the gap; a pair of pole pieces each arranged on a gap side of an opposing surface of each of the permanent magnets and having a peripheral projection in opposing direction; and an adjustment permanent magnet piece having magnetic flux amount of at most 2×10−7 Wb provided so as to magnetically communicate with a magnetic field formed in the gap.
摘要翻译：本发明的目的是便于磁场的调整。提供了一种具有相对永磁体的磁路，包括：一对永久磁铁，其一对永磁体沿着厚度方向被磁化; 磁轭耦合到所述永磁体并且设置在所述永磁体和所述间隙之外的磁轭; 一对磁极片，每个所述永磁体的相对表面的间隙侧布置，并且具有相反方向的周边突起; 以及具有至多2×10 -7 Wb的磁通量的调整永久磁铁片，以便与形成在间隙中的磁场磁性地连通。

4. 发明授权

US06924722B2 Magnetic circuit with opposing permanent magnets 失效
标题翻译：具有相对永久磁铁的磁路
公开(公告)号：US06924722B2
公开(公告)日：2005-08-02
申请号：US11006874
申请日：2004-12-08
申请人： Yuhito Doi , Koji Miyata , Dai Higuchi
发明人： Yuhito Doi , Koji Miyata , Dai Higuchi
IPC分类号： A61B5/055 , G01R33/383 , H01F1/057 , H01F7/02
CPC分类号： G01R33/383 , H01F1/057 , H01F7/0278
摘要： To reduce the cost of the magnet of magnetic circuits with opposing permanent magnets by ensuring that inexpensive magnets having a low coercive force can be used without substantial loss of magnetism caused by demagnetization fields, there is provided a magnetic circuit with opposing permanent magnets, comprising: a pair of permanent magnet units opposing each other across a gap, the pair of permanent magnets being magnetized in thickness direction, wherein each of the permanent magnet units comprises at least two types of permanent magnet pieces with different coercive forces, and wherein, the permanent magnet piece that receives the largest demagnetization force when the permanent magnet units are manufactured has a larger coercive force than at least one other type of the permanent magnet piece; a yoke magnetically coupled to the permanent magnet units, and provided outside of the permanent magnet units and the gap; and a pair of pole pieces each arranged on a gap side of an opposing surface of each of the permanent magnet units and having a peripheral projection in opposing direction.
摘要翻译：为了通过确保可以使用具有低矫顽磁力的廉价磁体而不会因退磁场造成实质上的磁性损失而降低具有相对永磁体的磁路的磁体的成本，提供了一种具有相对的永磁体的磁路，包括：一对永磁体单元，跨越间隙彼此相对，所述一对永磁体在厚度方向上被磁化，其中每个所述永磁体单元包括至少两种具有不同矫顽力的永磁体块，并且其中，所述永磁体当制造永磁体单元时，接收最大去磁力的磁体片具有比至少另一类型的永久磁铁片更大的矫顽力; 磁性地耦合到永磁体单元的轭，并且设置在永磁体单元和间隙的外部; 以及一对极片，每个极片布置在每个永磁体单元的相对表面的间隙侧上，并且具有相反方向的周边突起。

5. 发明申请

US20050128037A1 MAGNETIC CIRCUIT WITH OPPOSING PERMANENT MAGNETS AND METHOD FOR ADJUSTING MAGNETIC FIELD THEREOF 失效
标题翻译：具有对位永磁体的磁电路及其磁场调整方法
公开(公告)号：US20050128037A1
公开(公告)日：2005-06-16
申请号：US11007982
申请日：2004-12-09
申请人： Yuhito Doi , Koji Miyata , Dai Higuchi
发明人： Yuhito Doi , Koji Miyata , Dai Higuchi
IPC分类号： G01R33/3873 , A61B5/055 , G01R33/383 , H01F7/02 , H02K33/00
CPC分类号： G01R33/383 , H01F7/0278
摘要： It is an object of the present invention to facilitate adjustment of magnetic fields. There is provided a magnetic circuit with opposing permanent magnets, comprising: a pair of permanent magnets opposing each other across a gap, the pair of permanent magnets being magnetized in thickness direction; a yoke magnetically coupled to the permanent magnets, and provided outside of the permanent magnets and the gap; a pair of pole pieces each arranged on a gap side of an opposing surface of each of the permanent magnets and having a peripheral projection in opposing direction; and an adjustment permanent magnet piece having magnetic flux amount of at most 2×10−7 Wb provided so as to magnetically communicate with a magnetic field formed in the gap.
摘要翻译：本发明的目的是便于磁场的调整。提供了一种具有相对永磁体的磁路，包括：一对永久磁铁，其一对永磁体沿着厚度方向被磁化; 磁轭耦合到所述永磁体并且设置在所述永磁体和所述间隙之外的磁轭; 一对磁极片，每个所述永磁体的相对表面的间隙侧布置，并且具有相反方向的周边突起; 以及具有至多2×10 -7 Wb的磁通量的调整永久磁铁片，以便与形成在间隙中的磁场磁性地连通。

6. 发明申请

US20050128036A1 MAGNETIC CIRCUIT WITH OPPOSING PERMANENT MAGNETS 失效
标题翻译：具有对位永磁体的磁电路
公开(公告)号：US20050128036A1
公开(公告)日：2005-06-16
申请号：US11006874
申请日：2004-12-08
申请人： Yuhito Doi , Koji Miyata , Dai Higuchi
发明人： Yuhito Doi , Koji Miyata , Dai Higuchi
IPC分类号： A61B5/055 , G01R33/383 , H01F1/057 , H01F7/02 , H02K21/26
CPC分类号： G01R33/383 , H01F1/057 , H01F7/0278
摘要： To reduce the cost of the magnet of magnetic circuits with opposing permanent magnets by ensuring that inexpensive magnets having a low coercive force can be used without substantial loss of magnetism caused by demagnetization fields, there is provided a magnetic circuit with opposing permanent magnets, comprising: a pair of permanent magnet units opposing each other across a gap, the pair of permanent magnets being magnetized in thickness direction, wherein each of the permanent magnet units comprises at least two types of permanent magnet pieces with different coercive forces, and wherein, the permanent magnet piece that receives the largest demagnetization force when the permanent magnet units are manufactured has a larger coercive force than at least one other type of the permanent magnet piece; a yoke magnetically coupled to the permanent magnet units, and provided outside of the permanent magnet units and the gap; and a pair of pole pieces each arranged on a gap side of an opposing surface of each of the permanent magnet units and having a peripheral projection in opposing direction.
摘要翻译：为了通过确保可以使用具有低矫顽磁力的廉价磁体而不会因退磁场造成实质上的磁性损失而降低具有相对永磁体的磁路的磁体的成本，提供了一种具有相对的永磁体的磁路，包括：一对永磁体单元，跨越间隙彼此相对，所述一对永磁体在厚度方向上被磁化，其中每个所述永磁体单元包括至少两种具有不同矫顽力的永磁体块，并且其中，所述永磁体当制造永磁体单元时，接收最大去磁力的磁体片具有比至少另一类型的永久磁铁片更大的矫顽力; 磁性地耦合到永磁体单元的轭，并且设置在永磁体单元和间隙的外部; 以及一对极片，每个极片布置在每个永磁体单元的相对表面的间隙侧上，并且具有相反方向的周边突起。

7. 发明申请

US20050030138A1 Permanent magnet-type magnetic field generating device 有权
标题翻译：永磁式磁场产生装置
公开(公告)号：US20050030138A1
公开(公告)日：2005-02-10
申请号：US10909669
申请日：2004-08-02
申请人： Dai Higuchi
发明人： Dai Higuchi
IPC分类号： A61B5/055 , G01R33/383 , H01F7/02 , H01L21/205 , H01L21/3065 , H01F1/00
CPC分类号： G01R33/383
摘要： To reduce the skew angle components in a dipole ring magnetic field generating device, a magnetic field generating device 1 is provided in which comprises: a plurality of magnet elements 101 to 124 arranged in a ring shape such that a magnetization direction of the magnet elements undergoes one rotation over half a circumference of the ring, wherein the magnet elements generate a substantially unidirectional magnetic field in a space within the ring; and corrective magnets 201 to 204 arranged on an outer edge portion forming an aperture in a Z-axis direction of the magnetic field generating device, wherein the Z-axis is defined as a central axis of the magnetic field generating device, the Y-axis is defined as a direction perpendicular to the Z-axis and parallel to the unidirectional magnetic field, and the X axis is defined as a direction perpendicular to the Z axis and the Y axis.
摘要翻译：为了减少偶极环磁场产生装置中的歪斜角分量，提供了一种磁场产生装置1，其包括：多个以环形布置的磁体101至124，使得磁体元件的磁化方向经历所述环的半个圆周上的一个旋转，其中所述磁体元件在所述环内的空间中产生基本上单向的磁场; 以及布置在形成磁场产生装置的Z轴方向上的孔的外边缘部分上的校正磁铁201至204，其中Z轴被定义为磁场产生装置的中心轴，Y轴被定义为垂直于Z轴并平行于单向磁场的方向，并且X轴被定义为垂直于Z轴和Y轴的方向。

8. 发明授权

US07167067B2 Permanent magnet-type magnetic field generating device 有权
标题翻译：永磁式磁场产生装置
公开(公告)号：US07167067B2
公开(公告)日：2007-01-23
申请号：US10909669
申请日：2004-08-02
申请人： Dai Higuchi
发明人： Dai Higuchi
IPC分类号： H01F7/00
CPC分类号： G01R33/383
摘要： To reduce the skew angle components in a dipole ring magnetic field generating device, a magnetic field generating device 1 is provided in which comprises: a plurality of magnet elements 101 to 124 arranged in a ring shape such that a magnetization direction of the magnet elements undergoes one rotation over half a circumference of the ring, wherein the magnet elements generate a substantially unidirectional magnetic field in a space within the ring; and corrective magnets 201 to 204 arranged on an outer edge portion forming an aperture in a Z-axis direction of the magnetic field generating device, wherein the Z-axis is defined as a central axis of the magnetic field generating device, the Y-axis is defined as a direction perpendicular to the Z-axis and parallel to the unidirectional magnetic field, and the X axis is defined as a direction perpendicular to the Z axis and the Y axis.
摘要翻译：为了减少偶极环磁场产生装置中的歪斜角分量，提供了一种磁场产生装置1，其包括：多个以环形布置的磁体101至124，使得磁体元件的磁化方向经历所述环的半个圆周上的一个旋转，其中所述磁体元件在所述环内的空间中产生基本上单向的磁场; 以及布置在形成磁场产生装置的Z轴方向上的孔的外边缘部分上的校正磁铁201至204，其中Z轴被定义为磁场产生装置的中心轴，Y轴被定义为垂直于Z轴并平行于单向磁场的方向，并且X轴被定义为垂直于Z轴和Y轴的方向。

9. 发明授权

US09583999B2 Permanent magnet rotating machine 有权
标题翻译：永磁旋转机
公开(公告)号：US09583999B2
公开(公告)日：2017-02-28
申请号：US13575455
申请日：2011-02-04
申请人： Dai Higuchi
发明人： Dai Higuchi
IPC分类号： H02K21/24 , H02K1/27 , H02K1/32 , H02K9/06
CPC分类号： H02K21/24 , H02K1/2793 , H02K1/32 , H02K9/06
摘要： Provided is a technology for enhancing the reliability of a permanent magnet rotating machine against thermal degradation of a permanent magnet. Specifically, provided is a permanent magnet rotating machine comprising a housing which houses a rotation shaft, a rotor connected to the rotation shaft and configured to rotate together with the rotation shaft, a stator, and permanent magnets fastened to the rotor or the stator; an air intake port provided at one end of the housing and an air exhaust port provided at the other end of the housing, the air intake port and the air exhaust port being configured to allow cooling air to flow through the housing; and a blower for feeding the cooling air to the air intake port; wherein the permanent magnet rotating machine is configured to be driven by magnetic force of the permanent magnets, and among the permanent magnets, a permanent magnet in the air exhaust port side has a higher coercivity than a permanent magnet in the air intake port side.
摘要翻译：提供了一种用于提高永磁体旋转机器抵抗永久磁铁的热降解的可靠性的技术。具体地说，本发明提供一种永久磁铁旋转机械，其特征在于，具备容纳旋转轴的壳体，与所述旋转轴连结且与所述旋转轴一起旋转的转子，定子以及固定于所述转子或所述定子的永磁体; 设置在所述壳体的一端的进气口和设置在所述壳体的另一端的排气口，所述进气口和所述排气口构造成允许冷却空气流过所述壳体; 以及用于将冷却空气供给到进气口的鼓风机; 其特征在于，所述永久磁铁旋转机构被构成为由所述永久磁铁的磁力驱动，所述永磁体中，所述排气口侧的永久磁铁的矫顽力高于所述吸气口侧的永久磁铁。

10. 发明授权

US07034536B2 Inclined magnetic field generation coil and magnetic field generator for MRI 失效
标题翻译：倾斜磁场产生线圈和磁场发生器用于MRI
公开(公告)号：US07034536B2
公开(公告)日：2006-04-25
申请号：US10948605
申请日：2004-09-23
申请人： Dai Higuchi
发明人： Dai Higuchi
IPC分类号： G01V3/00
CPC分类号： G01R33/385
摘要： The present invention provides a magnetic field generator for MRI in which, by simplifying the component parts of the pole pieces incorporated therein, the magnetic field generator for MRI can be manufactured at a lower cost without detracting from its magnetic characteristics. Specifically, the present invention provides an inclined magnetic field generation coil for use in a magnetic field generator for MRI, the coil comprising a plurality of magnetic field regulating holes (17), an electric conductor in coiled form, and a resin base. Moreover, it also provides a magnetic field generator for MRI comprising a pair of permanent magnets magnetized in the direction of the thickness and opposed to each other with a gap left therebetween, and a pair of pole pieces having a peripheral projection and disposed on the opposed faces of the respective permanent magnets, in order to create a uniform magnet field space between the pole pieces, the magnetic field generator further comprising an inclined magnetic field generator (9) disposed within each of the pole pieces and having a mechanism (17) for regulating the magnetic field nonuniformity of the uniform magnet field space.
摘要翻译：本发明提供一种用于MRI的磁场发生器，其中通过简化其中结合的极片的组成部分，可以以更低的成本制造用于MRI的磁场发生器，而不会降低其磁特性。具体地说，本发明提供了一种用于MRI磁场发生器的倾斜磁场产生线圈，该线圈包括多个磁场调节孔（17），卷绕形式的电导体和树脂基座。此外，它还提供了一种用于MRI的磁场发生器，其包括在厚度方向上被磁化并且彼此间隔开的间隔开的间隙的一对永磁体，以及一对具有周向突起的极片，为了在极片之间产生均匀的磁场空间，磁场发生器还包括设置在每个极片内的倾斜磁场发生器（9），并具有用于调节均匀磁场空间的磁场不均匀性。

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