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    • 2. 发明授权
    • Magnetic field generator for MRI
    • 磁场发生器用于MRI
    • US07796002B2
    • 2010-09-14
    • US11664261
    • 2004-09-30
    • Shigeo HashimotoMasaaki Aoki
    • Shigeo HashimotoMasaaki Aoki
    • H01F7/02
    • G01R33/3802G01R33/3806G01R33/383
    • 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.
    • 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。
    • 3. 发明授权
    • Magnetic field generating device and MRI equipment using the device
    • 磁场发生装置和使用该装置的MRI设备
    • US07084633B2
    • 2006-08-01
    • US10513793
    • 2003-05-19
    • Masaaki AokiTsuyoshi Tsuzaki
    • Masaaki AokiTsuyoshi Tsuzaki
    • G01V3/00
    • G01R33/3806G01R33/383
    • A magnetic field generator (10) capable of generating a more intense magnetic field, and an MRI apparatus (200) using it are provided. Permanent magnets (12a), (12b), (14a), (14b), (16a), (16b), (18a), (18b), (20a), (20b), (22) and (24) are disposed annularly for formation of a magnetic field generation space (30). Ferromagnetic materials (26a) and (26b) are provided near the magnetic field generation space (30), at places passed by a magnetic flux. Each of the permanent magnets (12a), (14a), (16a), (18a) and (20a) surrounding the ferromagnetic material (26a) is magnetized so as to make an S pole on the side of the ferromagnetic material (26a). Each of the permanent magnets (12b), (14b), (16b), (18b) and (20b) surrounding the ferromagnetic material (26b) is magnetized so as to make an N pole on the side of the ferromagnetic material (26b). An MRI apparatus (200) is obtained by using the magnetic field generator (10).
    • 提供能够产生更强磁场的磁场发生器(10)和使用它的MRI装置(200)。 永磁体(12a),(12b),(14a),(14b),(16a),(16b),(18a),(18b),(20a) ),(22)和(24)环形地设置以形成磁场产生空间(30)。 铁磁材料(26a)和(26b)设置在磁场产生空间(30)附近,在通过磁通的地方。 围绕铁磁材料(26a)的永磁体(12a),(14a),(16a),(18a)和(20a)中的每一个被磁化以使S极在 铁磁材料(26a)。 围绕铁磁材料(26b)的每个永磁体(12b),(14b),(16b),(18b)和(20b)被磁化,以便在 铁磁材料(26b)。 通过使用磁场发生器(10)获得MRI装置(200)。
    • 6. 发明授权
    • Magnetic field generating apparatus for use in MRI
    • 用于MRI的磁场产生装置
    • US5557205A
    • 1996-09-17
    • US355163
    • 1994-12-08
    • Kimiharu OhtaMasaaki Aoki
    • Kimiharu OhtaMasaaki Aoki
    • G01R33/20A61B5/055G01R33/383H01F7/02G01V3/00
    • H01F7/0278G01R33/383
    • In a magnetic field generating apparatus for use in MRI comprising cylindrical yokes, a pair of permanent magnets of a trapezoidal section opposed in parallel with each other in the cylindrical yokes with a predetermined gap being defined between each of the pole faces of them, permanent magnets of a triangular section in adjacent with both sides of the trapezoidal permanent magnet in which a magnetic field space having a hexagonal cross section in perpendicular to the longitudinal direction defined by pole faces of the trapezoidal permanent magnets and the pole faces of the triangular permanent magnets, whereinthe trapezoidal permanent magnets comprise rare earth system permanent magnet and the direction of magnetization thereof is identical with the direction of the magnetic field in the magnetic field space, the triangular permanent magnets comprise a ferrite system permanent magnet and the direction of magnetization thereof is at a 90.degree. direction relative to the counterface to the magnetic field space, and an extreme end at a yoke abutting face of the trapezoidal permanent magnet corresponds with an extreme end at yoke abutting face of the triangular permanent magnet.
    • 在用于包括圆柱形轭铁的MRI的磁场产生装置中,一对在圆柱形轭铁中彼此平行相对的梯形部分的永久磁体在其每个极面之间限定有预定的间隙,永磁体 与梯形永久磁铁的极面相垂直的纵向方向的六角形截面的磁场空间与三角形永久磁铁的极面相邻的三角形截面, 其中所述梯形永磁体包括稀土系永磁体,并且其磁化方向与磁场空间中的磁场方向相同,所述三角形永久磁铁包括铁氧体系永磁体,并且其磁化方向在 相对于t的相对面为90°方向 磁场空间,梯形永久磁铁的磁轭邻接面的末端与三角形永久磁铁的磁轭邻接面的最末端对应。
    • 8. 发明授权
    • Superconducting device
    • 超导装置
    • US4884111A
    • 1989-11-28
    • US073408
    • 1987-07-13
    • Toshikazu NishinoMutsuko MiyakeUshio KawabeYutaka HaradaMasaaki AokiMikio Hirano
    • Toshikazu NishinoMutsuko MiyakeUshio KawabeYutaka HaradaMasaaki AokiMikio Hirano
    • H01L21/82H01L39/22
    • H01L39/228H01L21/82
    • A pair of superconducting electrodes are so formed as to interpose a smeiconductor therebetween, and a control electrode is formed on the seimiconductor through an insulator film so as to control the superconductive weak coupling state in the semiconductor between the superconducting electrodes. The distance between the superconducting electrodes is determined by the thickness of the superconductor interposed between the two electrodes, whereby the interelectrode distance is settled with a high precision to improve the uniformity of the device characteristic.And in an arrangement where two superconducting electrodes are formed on a semiconductor layer and the superconductive weak coupling state between such two electrodes is controlled by a third electrode, the gain is increadable by furnishing a varied impurity distribution in the semiconductor layer.
    • 一对超导电极形成为在其间插入半导体,并且通过绝缘膜在半导体上形成控制电极,以便控制超导电极之间的半导体中的超导弱耦合状态。 超导电极之间的距离由插入在两个电极之间的超导体的厚度决定,从而以高精度稳定电极间距离,以提高器件特性的均匀性。 并且在半导体层上形成两个超导电极并且在这两个电极之间的超导弱耦合状态由第三电极控制的布置中,通过在半导体层中提供不同的杂质分布来增加增益。
    • 10. 发明申请
    • MAGNETIC FIELD GENERATOR
    • 磁场发生器
    • US20110273254A1
    • 2011-11-10
    • US13144996
    • 2010-02-26
    • Masaaki AokiMichiaki Kishimoto
    • Masaaki AokiMichiaki Kishimoto
    • H01F7/02
    • G01R33/3806G01R33/3802G01R33/383Y10T29/49014
    • There is provided a magnetic field generator in which separation and dislocation of permanent magnets from their permanent magnet groups is prevented easily and reliably for a long period of time without sacrificing productivity. A magnetic field generator 10 includes a permanent magnet group 14a which is provided on a plate yoke 12a; a pole piece 16a which is provided in a first main surface of the permanent magnet group 14a, leaving an exposed region 18b thereon; a frame-like member 34 which is provided on the plate yoke 12a to surround the permanent magnet group 14a; and a flange-shaped member 36 which is provided in the pole piece 16a to cover the exposed region 18b. Presser bolts 44 are threaded into the frame-like member 34 and press an outer circumferential surface 18a of the permanent magnet group 14a directly or via insertion members 42. Presser bolts 48 are threaded into the flange-shaped member 36, and press the exposed region 18b of the permanent magnet group 14a directly or via insertion members 46. A plate yoke 12b has the same configuration.
    • 提供了一种磁场发生器,其中永久磁铁与其永磁体组的分离和脱位在长时间内容易且可靠地被防止而不牺牲生产率。 磁场发生器10包括设置在板状磁轭12a上的永磁体组14a; 设置在永磁体组14a的第一主表面上的极靴16a,其上露出暴露区域18b; 设置在板状轭铁12a上以围绕永磁体组14a的框状构件34; 以及凸缘状构件36,其设置在极靴16a中以覆盖暴露区域18b。 压脚螺栓44被螺纹连接到框状构件34中,并且直接或经由插入构件42按压永磁体组14a的外周面18a。将压紧螺栓48拧入法兰形构件36中,并将暴露区域 永磁体组14a的直径18b或18b经由插入构件46.板状磁轭12b具有相同的构造。