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1. 发明授权

US5291171A Magnet apparatus suitable for magnetic resonance imaging 失效
标题翻译：适用于磁共振成像的磁铁设备
公开(公告)号：US5291171A
公开(公告)日：1994-03-01
申请号：US991225
申请日：1992-12-16
申请人： Nobutaka Kobayashi , Ken Ohashi , Koji Miyata
发明人： Nobutaka Kobayashi , Ken Ohashi , Koji Miyata
IPC分类号： A61B5/055 , G01R33/20 , G01R33/383 , H01F5/00 , H01F7/02 , H01F3/00
CPC分类号： H01F7/0278 , G01R33/383
摘要： The invention relates to an apparatus for producing a magnetic field in a space between two oppositely arranged permanent magnet discs, which is suitable for use in magnetic resonance imaging (MRI). An object of the invention is to reduce the size and weight of the yoke connecting the two permanent magnet discs without causing magnetic saturation of the yoke in view of the fact that magnetic saturation of the yoke leads to the appearance of leakage flux and consequential lowering of the uniformity of the magnetic field. The object is accomplished by regulating the cross-sectional area of the whole magnetic path in the yoke, A.sub.y, such that the following equation holds: A.sub.y =1/a.times.A.sub.m B.sub.m /B.sub.ys, where A.sub.m is the cross-sectional area of magnetic path in each permanent magnet disc, B.sub.m is the magnetic flux density in each permanent magnet disc at normal temperature, B.sub.ys is the saturation magnetic flux density of the yoke at normal temperature, and a is a coefficient the value of which is not larger than 1 and not smaller than 0.6.
摘要翻译：本发明涉及一种用于在两个相对布置的永磁体盘之间的空间中产生磁场的装置，其适用于磁共振成像（MRI）。发明内容本发明的目的是为了减小连接两个永久磁铁盘片的磁轭的尺寸和重量，而不会引起磁轭的磁饱和，因为磁轭的磁饱和导致漏磁通的出现，并导致降低磁场的均匀性。该目的是通过调节磁轭Ay中的整个磁路的横截面积来实现的，使得以下等式成立：Ay = 1 / a * AmBm / Bys，其中Am是磁路的横截面积在每个永久磁铁盘中，Bm是常温下每个永久磁铁盘中的磁通密度，Bys是磁轭在常温下的饱和磁通密度，a是其值不大于1的系数，不小于0.6。

2. 发明申请

US20060012252A1 Linear motor for use in machine tool 审中-公开
标题翻译：用于机床的直线电机
公开(公告)号：US20060012252A1
公开(公告)日：2006-01-19
申请号：US11184645
申请日：2005-07-18
申请人： Koji Miyata , Masanobu Uchida , Ken Ohashi
发明人： Koji Miyata , Masanobu Uchida , Ken Ohashi
IPC分类号： H02K41/00
CPC分类号： H02K41/031 , H02K1/146 , H02K1/2733 , H02K7/09 , H02K2213/03
摘要： The invention is a linear motor that improves the processing speed of machine tools is also a linear motor with significantly reduced cogging force, with which high-speed and high-accuracy processing can be realized. More specifically, the invention is a linear motor for use in a machine tool comprising a stator in which a plurality of permanent magnets having the same shape are mounted on both faces of a plate-like yoke at even intervals such that the permanent magnets have polarities being perpendicular to a direction in which a pair of movers move and alternating in the moving direction; the movers in which armature cores wound with armature coils are disposed such that the armature cores are opposed to the rows of the permanent magnets on the both faces of the stator; and magnetic cores that are disposed on both ends of the movers such that the distance between the magnetic cores and the rows of the permanent magnets is longer than that between the armature cores and the rows of the permanent magnets. Moreover, provided is a laser processing machine in which the above-mentioned permanent magnet type linear motor is used for a three-dimensional moving mechanism.
摘要翻译：本发明是提高机床加工速度的线性马达，也是具有明显减小的齿槽力的线性马达，可实现高速高精度加工。更具体地说，本发明是一种用于机床的线性电动机，其包括定子，其中具有相同形状的多个永磁体以均匀间隔安装在板状磁轭的两个面上，使得永磁体具有极性垂直于一对移动体沿移动方向移动和交替的方向; 电枢铁芯缠绕有电枢线圈的移动器被布置成使得电枢铁芯与定子的两个表面上的永久磁铁列相对; 以及设置在移动体的两端的磁芯，使得磁芯与永磁体的排之间的距离比电枢铁芯和永磁体列之间的距离长。此外，提供了一种激光加工机，其中上述永磁型线性马达用于三维移动机构。

3. 发明授权

US5963117A Opposed magnet-type magnetic circuit assembly with permanent magnets 失效
标题翻译：具有永久磁铁的磁铁型磁路组件
公开(公告)号：US5963117A
公开(公告)日：1999-10-05
申请号：US206291
申请日：1998-12-07
申请人： Ken Ohashi , Yuhito Yoneda , Koji Miyata , Yuji Inoue
发明人： Ken Ohashi , Yuhito Yoneda , Koji Miyata , Yuji Inoue
IPC分类号： G01R33/383 , G01R33/3873 , H01F7/02
CPC分类号： G01R33/383 , G01R33/3873
摘要： Proposed is an improvement in an opposed-magnet magnetic circuit assembly with permanent magnets suitable for use, for example, in an MRI instrument comprising a pair of upper and lower permanent magnets to form a magnetic-field gap space therebetween, a pair of magnetic-field adjustment plates each on the surface of the permanent magnet to face the gap space and a pair of back yokes each on the back surface of the permanent magnet. According to the first aspect of the invention, a combination of a gradient coil and a shimming plate is mounted on the magnetic-field adjustment plate with intervention of several pieces of shim members and, further, another set of second shim members are bonded to the surface of the shimming plate facing the gap space with an object to improve the uniformity of the magnetic field in the gap space. According to the second aspect of the invention, which is directed to the problem of alleviation of the oppressive sense received by the patient lying in the MRI instrument due to his encaved condition, the back yokes are magnetically and mechanically connected with two and only two columnar connecting yokes each of which has a smaller cross section in the center portion than in the upper and lower end portions in order to ensure lateral openness on both sides of the patient. Preferable configurations are also proposed for the back yokes and the permanent magnets.
摘要翻译：提出了一种具有永磁体的对置磁体磁路组件的改进，该永磁体适用于例如在包括一对上下永磁体的MRI仪器中以在其间形成磁场间隙空间的一对磁 - 在永磁体的表面上分别面对间隙空间的磁场调整板以及永久磁铁背面上的一对后轭。根据本发明的第一方面，梯度线圈和匀场板的组合通过几片垫片构件的介入安装在磁场调节板上，此外，另一组第二垫片构件结合到垫片的表面面对间隙空间与物体，以提高间隙空间中的磁场的均匀性。根据本发明的第二方面，其针对的是由于患者躺在MRI仪器中而被放置在MRI仪器中的压迫感的减轻问题，背轭与两个且仅两个柱状磁性和机械连接连接轭，其中心部分的横截面比在上端部和下端部分具有较小的横截面，以确保患者两侧的横向开放性。对于后轭和永磁体也提出了优选的构造。

4. 发明申请

US20060012251A1 Linear motor for use in machine tool 审中-公开
标题翻译：用于机床的直线电机
公开(公告)号：US20060012251A1
公开(公告)日：2006-01-19
申请号：US11184135
申请日：2005-07-18
申请人： Koji Miyata , Masanobu Uchida , Ken Ohashi
发明人： Koji Miyata , Masanobu Uchida , Ken Ohashi
IPC分类号： H02K41/00
CPC分类号： H02K41/031 , H02K1/146 , H02K1/2733 , H02K16/00 , H02K29/03 , H02K2213/03
摘要： The invention is a linear motor that improves the processing speed of machine tools and is also a linear motor that can improve the thrust in order to achieve high acceleration. More specifically, the invention is a linear motor for use in a machine tool comprising linear motor units, each unit comprising a stator in which a plurality of permanent magnets having the same shape are mounted on both faces of a plate-like yoke at even intervals such that the permanent magnets have polarities being perpendicular to a direction in which a pair of movers move and alternating in the moving direction; and the movers in which armature cores wound with armature coils are disposed such that the armature cores are opposed to the rows of the permanent magnets on the both faces of the stator, wherein the linear motor units are disposed in parallel. When the number of the linear motor units is N and a magnet pitch, which is the sum of the width of each of the permanent magnets and the distance between adjacent permanent magnets, is τ, the linear motor units are preferably disposed such that the linear motor units are displaced in the moving direction of the movers by a natural number multiple of τ/N.
摘要翻译：本发明是提高机床加工速度的线性马达，也是能够提高推力以实现高加速度的线性马达。更具体地说，本发明是用于包括线性电动机单元的机床的线性电动机，每个单元包括定子，其中具有相同形状的多个永磁体以均匀间隔安装在板状磁轭的两个面上使得永磁体具有垂直于一对移动器在移动方向上移动和交替的方向的极性; 电枢铁芯与电枢线圈缠绕的移动体配置成电枢铁芯与定子的两面上的永久磁铁列相对，其中线性电动机单元平行设置。当线性电动机单元的数量为N，作为每个永磁体的宽度和相邻永磁体之间的距离的总和的磁体间距为τ时，线性电动机单元优选地布置成使得线性电动机单元电动机单元在移动器的移动方向上以τ/ N的自然数乘以位移。

5. 发明申请

US20060033386A1 Linear motor for use in machine tool 审中-公开
标题翻译：用于机床的直线电机
公开(公告)号：US20060033386A1
公开(公告)日：2006-02-16
申请号：US11200784
申请日：2005-08-10
申请人： Masanobu Uchida , Koji Miyata , Ken Ohashi
发明人： Masanobu Uchida , Koji Miyata , Ken Ohashi
IPC分类号： H02K41/00
CPC分类号： H02K41/03 , H02K1/34
摘要： Provided is a linear motor for use in a machine tool having high positioning accuracy. A linear motor 10 for use in a machine tool comprises: a stator 13 comprising a plurality of permanent magnets 12 which are arranged on both faces of a plate-like yoke 11 at equal intervals in a direction in which a mover moves, wherein the permanent magnets have the same shape, are magnetized in a direction perpendicular to the faces of the yoke 11, and an adjacent permanent magnet 12 has a different magnetization orientation; and a pair of movers 16 comprising armature cores 14 wound with armature coils 15 which are opposed to rows of the permanent magnets 12 provided on both the faces of the plate-like yoke 11 such that central axes of the armature cores 15 are parallel to the magnetization direction of the permanent magnets 12. A surface treatment film can be preferably formed on an exposed surface of the permanent magnets after the plurality of permanent magnets 12 is arranged on both the faces of the plate-like yoke 11.
摘要翻译：提供一种用于具有高定位精度的机床中的线性马达。用于机床的直线电动机10包括：定子13，其包括多个永久磁铁12，它们在移动件移动的方向上以等间隔布置在板状磁轭11的两个面上，其中永磁体磁体具有相同的形状，在垂直于磁轭11的表面的方向上被磁化，并且相邻的永磁体12具有不同的磁化取向; 以及一对移动体16，其包括缠绕有电枢线圈15的电枢芯14，电枢线圈15与设置在板状磁轭11的两个表面上的永久磁铁12的行相对，使得电枢铁芯15的中心轴平行于永久磁铁12的磁化方向。在多个永磁体12布置在板状磁轭11的两个表面上之后，表面处理膜可以优选地形成在永磁体的暴露表面上。

6. 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％。

7. 发明授权

US5864275A Opposed magnet-type magnetic circuit assembly with permanent magnets 失效
公开(公告)号：US5864275A
公开(公告)日：1999-01-26
申请号：US703450
申请日：1996-08-27
申请人： Ken Ohashi , Yuhito Yoneda , Koji Miyata , Yuji Inoue
发明人： Ken Ohashi , Yuhito Yoneda , Koji Miyata , Yuji Inoue
IPC分类号： G01R33/383 , G01R33/3873 , G01R33/20
CPC分类号： G01R33/383 , G01R33/3873
摘要： Proposed is an improvement in an opposed-magnet magnetic circuit assembly with permanent magnets suitable for use, for example, in an MRI instrument comprising a pair of upper and lower permanent magnets to form a magnetic-field gap space therebetween, a pair of magnetic-field adjustment plates each on the surface of the permanent magnet to face the gap space and a pair of back yokes each on the back surface of the permanent magnet. According to the first aspect of the invention, a combination of a gradient coil and a shimming plate is mounted on the magnetic-field adjustment plate with intervention of several pieces of shim members and, further, another set of second shim members are bonded to the surface of the shimming plate facing the gap space with an object to improve the uniformity of the magnetic field in the gap space. According to the second aspect of the invention, which is directed to the problem of alleviation of the oppressive sense received by the patient lying in the MRI instrument due to his encaved condition, the back yokes are magnetically and mechanically connected with two and only two columnar connecting yokes each of which has a smaller cross section in the center portion than in the upper and lower end portions in order to ensure lateral openness on both sides of the patient. Preferable configurations are also proposed for the back yokes and the permanent magnets.

8. 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。

9. 发明授权

US08013701B2 Magnetic circuit and method of applying magnetic field 有权
标题翻译：磁场和磁场施加方法
公开(公告)号：US08013701B2
公开(公告)日：2011-09-06
申请号：US12591785
申请日：2009-12-01
申请人： Ken Ohashi
发明人： Ken Ohashi
IPC分类号： H01F7/02 , H01F7/20 , H01F13/00 , G11B5/66
CPC分类号： H01F7/0247 , G11B5/852 , H01F1/055 , H01F3/14 , H01F7/0205 , H01F13/00
摘要： In a magnetic circuit for providing magnetic anisotropy in the in-plane radial direction of a soft magnetic under layer, magnets for perpendicular magnetization are respectively provide on the north and south poles of a magnet for horizontal magnetization. When magnetic circuits configured thus are stacked in a plurality of stages, a magnetic field (air-gap magnetic field) formed in a gap between the magnetic circuits is superimposed by magnetic fields from the magnets for perpendicular magnetization as well as a magnetic field from the magnet for horizontal magnetization (in-plane magnetization). The pole faces of the magnets for perpendicular magnetization are disposed closer to the gap between the magnetic circuits, so that a stronger magnetic field can be formed in the gap.
摘要翻译：在用于在软磁下层的面内径向方向上提供磁各向异性的磁路中，用于垂直磁化的磁体分别在用于水平磁化的磁体的北极和南极上提供。当由此构成的磁路以多级堆叠时，形成在磁路之间的间隙中的磁场（气隙磁场）由用于垂直磁化的磁体的磁场以及来自磁场的磁场叠加磁体用于水平磁化（平面内磁化）。用于垂直磁化的磁体的极面设置成更靠近磁路之间的间隙，从而可以在间隙中形成更强的磁场。

10. 发明授权

US07851076B2 Method of fabricating silicon substrate for magnetic recording media, and magnetic recording medium 失效
标题翻译：制造用于磁记录介质的硅衬底和磁记录介质的方法
公开(公告)号：US07851076B2
公开(公告)日：2010-12-14
申请号：US12211379
申请日：2008-09-16
申请人： Ken Ohashi
发明人： Ken Ohashi
IPC分类号： G11B5/71 , G11B5/82 , H01L21/20
CPC分类号： G11B5/8404
摘要： In this invention, etching is not performed in the step of planarizing a polycrystalline Si wafer, but only mechanical grinding is performed for planarization. This is because, since the etching rate is crystal-face dependent, etching of the polycrystalline Si wafer unavoidably results in formation of steps due to different crystal face orientations of individual crystal grains exposed on a surface of the wafer, thus hindering precision surface planarization. Subsequently, the Si wafer surface is coated with an oxide film to form an Si wafer with oxide film prior to the final polishing stage and then a surface of the oxide film is planarized, to give a planar substrate (i.e., Si substrate with oxide film) having no step on the surface thereof.
摘要翻译：在本发明中，在平坦化多晶Si晶片的步骤中不进行蚀刻，而仅进行机械研磨以进行平面化。这是因为，由于蚀刻速率是晶面依赖的，所以多晶Si晶片的蚀刻不可避免地导致由于暴露在晶片表面上的各个晶粒的晶面取向不同而产生的步骤的形成，从而妨碍了精确的表面平坦化。随后，在最终抛光阶段之前，用氧化膜涂覆Si晶片表面以形成具有氧化膜的Si晶片，然后使氧化膜的表面平坦化，得到平面基板（即，具有氧化膜的Si衬底）在其表面上没有台阶。

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