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    • 14. 发明授权
    • Magnetic head actuator and magnetic disk drive using the same
    • 磁头执行器和磁盘驱动器使用相同
    • US07333298B2
    • 2008-02-19
    • US11004861
    • 2004-12-07
    • Hajime NakamuraTakehisa Minowa
    • Hajime NakamuraTakehisa Minowa
    • G11B5/56
    • G11B5/5552G11B5/59627
    • In conjunction with a magnetic disk drive unit comprising a voice coil motor (14), an arm (12) extending from the motor, a magnetic head actuator (2) mounted at a distal end of the arm, a suspension (16) coupled to the actuator, and a magnetic head slider mounted on the suspension at its distal end, the magnetic head actuator (2) comprises a stator section (30) secured to the arm distal end, an attachment section (18) secured to the arm distal end together with the stator section, micro-beams (20, 22) extending from the attachment section, a rotor section (24) supported for swing motion by the micro-beams, a permanent magnet (32) disposed in the stator section, and a coil (28) disposed in the rotor section. Electric current is conducted through the coil in the magnetic field created by the permanent magnet for causing the micro-beams to be displaced for inducing swing motion of the suspension secured to the rotor section and the magnetic head slider mounted thereon.
    • 结合包括音圈电动机(14)的磁盘驱动单元,从电动机延伸的臂(12),安装在臂的远端的磁头致动器(2),悬架(16),其联接到 致动器和安装在其远端处的悬架上的磁头滑块,磁头致动器(2)包括固定到臂远端的定子部分(30),固定到臂远端的附接部分(18) 与所述定子部分一起,从所述安装部延伸的微梁(20,22),被所述微梁支撑以摆动运动的转子部分(24),设置在所述定子部分中的永磁体(32),以及 设置在转子部分中的线圈(28)。 在由永久磁铁产生的磁场中,电流通过线圈传导,使得微波束发生位移,以引起固定在转子部分上的悬架和安装在其上的磁头滑块的摆动运动。
    • 19. 发明申请
    • Functionally graded rare earth permanent magnet
    • 功能分级稀土永磁体
    • US20060213582A1
    • 2006-09-28
    • US11340496
    • 2006-01-27
    • Hajime NakamuraKoichi HirotaMasanobu ShimaoTakehisa Minowa
    • Hajime NakamuraKoichi HirotaMasanobu ShimaoTakehisa Minowa
    • H01F1/057H01F1/058
    • H01F1/0577H01F1/058H01F41/0266H01F41/0293
    • A functionally graded rare earth permanent magnet is in the form of a sintered magnet body having a composition R1aR2bTcAdFeOfMg wherein the concentration of R2/(R1+R2) contained in grain boundaries surrounding primary phase grains of (R1,R2)2T14A tetragonal system within the sintered magnet body is on the average higher than the concentration of R2/(R1+R2) contained in the primary phase grains, R2 is distributed such that its concentration increases on the average from the center toward the surface of the magnet body, the oxyfluoride of (R1,R2) is present at grain boundaries in a grain boundary region that extends from the magnet body surface to a depth of at least 20 μm, and the magnet body includes a surface layer having a higher coercive force than in the interior. The invention provides permanent magnets having improved heat resistance.
    • 功能梯度稀土永磁体是烧结磁体的形式,具有组成R 1,B 2,B 2,B 2, 其中,在本发明的另一个实施方案中, 包含在(R 1)的主相晶粒周围的晶界中的R 2 O 2的浓度(R 1→R 2) 烧结磁体中的四方晶系平均高于R 2 /(R 1→R 2 + 2)是分布的,使得其浓度 从中心向磁体的表面平均增加,(R 1,R 2,R 2)的氟氧化物存在于晶界区域的晶界处, 从磁体表面延伸到至少20μm的深度,并且磁体包括具有较高矫顽力的表面层 比在室内。 本发明提供了具有改善的耐热性的永磁体。