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14 条记录 (耗时 0.013 秒)

    Magnetic recording medium
    2.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US06310837B1

    公开(公告)日：2001-10-30

    申请号：US09170083

    申请日：1998-10-13

    申请人： Tsutomu Chou ,  Masao Shigeta ,  Masahiro Karatsu ,  Mari Fujii ,  Chikara Ishizaka ,  Katsumi Saito ,  Katsuhiko Wakayama ,  Shohei Mimura ,  Masahiro Ito

    发明人： Tsutomu Chou ,  Masao Shigeta ,  Masahiro Karatsu ,  Mari Fujii ,  Chikara Ishizaka ,  Katsumi Saito ,  Katsuhiko Wakayama ,  Shohei Mimura ,  Masahiro Ito

    IPC分类号： G11B566

    CPC分类号： G06K19/06196 ,  Y10T428/2982

    摘要： The invention is a magnetic recording medium which is effectively protected against forgery by the alteration of recorded data, and a method for carrying out writing and reading on this magnetic recording medium. The magnetic recording medium of the invention comprises a recording material composed of a crystalline alloy containing Fe and Al . In the recoding material, the total amount of Fe and Al is at least 90 at % and the atomic ratio Al/(Fe+Al) ranges from 0.30 to 0.45. The recording material changes from a disordered phase to an ordered phase by heating. The recording material has a saturation magnetization of at least 45 emu/g prior to heating and lowers its saturation magnetization by at least 35 emu/g upon heating. Dark regions are observable in a bright-field image of the recording material by transmission electron microscopy, the dark regions accounting for 15-60% of the recording material in areal ratio and having a maximum breadth of 10-200 nm.

    摘要翻译： 本发明是通过改变记录数据有效地防止伪造的磁记录介质，以及用于在该磁记录介质上执行写和读的方法。 本发明的磁记录介质包括由含有Fe和Al的结晶合金构成的记录材料。 在记录材料中，Fe和Al的总量为90原子％以上，原子比Al /（Fe + Al）为0.30〜0.45。 记录材料通过加热从无序相变为有序相。 记录材料在加热之前具有至少45emu / g的饱和磁化强度，并且在加热时将其饱和磁化降低至少35emu / g。 通过透射电子显微镜在记录材料的明场图像中可以观察到暗区域，黑色区域占记录材料的面积比率的15-60％，最大宽度为10-200nm。

    Magnetic fluid
    3.
    发明授权
    Magnetic fluid 失效
    磁性液体

    公开(公告)号：US4608186A

    公开(公告)日：1986-08-26

    申请号：US760469

    申请日：1985-07-30

    申请人： Katsuhiko Wakayama ,  Hiraku Harada

    发明人： Katsuhiko Wakayama ,  Hiraku Harada

    IPC分类号： H01F1/44 ,  C09K5/00

    CPC分类号： H01F1/442

    摘要： A magnetic fluid comprising metal fine particles of cobalt, 25 to 60% based on the weight of the metal particles of a surface-active agent selected from the group consisting of polyglycerine fatty acid esters, sorbitan fatty acid esters, and mixtures thereof, and 50 to 250% based on the weight of the metal particles of a low boiling hydrocarbon medium exhibits remarkably high saturation magnetization.

    摘要翻译： 一种包含钴的金属细颗粒的磁性流体，基于选自聚甘油脂肪酸酯，脱水山梨糖醇脂肪酸酯及其混合物的表面活性剂的金属颗粒的重量为25至60％，和其混合物 至250％，基于低沸点烃介质的金属颗粒的重量显示出非常高的饱和磁化强度。

    Method for producing electromagnetic wave absorbing sheet, method for classifying powder, and electromagnetic wave absorbing sheet
    4.
    发明申请
    Method for producing electromagnetic wave absorbing sheet, method for classifying powder, and electromagnetic wave absorbing sheet 审中-公开
    电磁波吸收片的制造方法，粉末分级方法和电磁波吸收片

    公开(公告)号：US20060099454A1

    公开(公告)日：2006-05-11

    申请号：US11269496

    申请日：2005-11-07

    申请人： Hiroki Morikoshi ,  Katsuhiko Wakayama

    发明人： Hiroki Morikoshi ,  Katsuhiko Wakayama

    IPC分类号： H01F1/03 ,  B32B15/00

    CPC分类号： H01F41/0246 ,  B22F1/0055 ,  B22F5/006 ,  B22F2003/248 ,  B22F2998/10 ,  H01F1/18 ,  H01F1/24 ,  H05K9/0083 ,  Y10T428/32 ,  B22F9/04 ,  B22F1/0059 ,  B22F3/18 ,  B22F3/24

    摘要： An object of the present invention is to provide a method for producing an electromagnetic wave absorbing sheet with properties thereof further improved. A treated powder P0 pulverized and flaked in a pulverizing step is placed in a centrifugal gas-flow classifier 50. The treated powder is classified into a flaky soft magnetic metal powder P1 and a non-flaky powder P2 on the basis of the difference between the centrifugal force and the drag acting on each of these powders in a gas flow circling in a chamber 51. The non-flaky powder P2 is eliminated and the flaky soft magnetic metal powder P1 is used to form an electromagnetic wave absorbing sheet, the performances of the electromagnetic wave absorbing sheet being thereby improved. The classified non-flaky powder P2 is preferably recycled as the raw material powder used in the pulverizing step.

    摘要翻译： 本发明的目的在于提供一种电磁波吸收片的制造方法，其特性进一步提高。 在粉碎步骤中粉碎和粉碎的处理粉末P 0被放置在离心气流分级器50中。处理过的粉末基于粉末状分级器50分为片状软磁性金属粉末P 1和非片状粉末P 2 在室51中循环的气流中，离心力和作用在这些粉末上的阻力之间的差异被消除，并且使用片状软磁性金属粉末P 1形成电磁波吸收 从而提高了电磁波吸收片的性能。 分级的非片状粉末P 2优选作为粉碎步骤中使用的原料粉末进行再循环。

    FLAKY SOFT MAGNETIC METAL POWDER AND MAGNETIC CORE MEMBER FOR RFID ANTENNA
    7.
    发明申请
    FLAKY SOFT MAGNETIC METAL POWDER AND MAGNETIC CORE MEMBER FOR RFID ANTENNA 有权
    FLAKY软磁性金属粉末和磁性核心会员RFID天线

    公开(公告)号：US20070221297A1

    公开(公告)日：2007-09-27

    申请号：US11686386

    申请日：2007-03-15

    申请人： Atsuhito Matsukawa ,  Katsuhiko Wakayama ,  Yoshihito Hirai

    发明人： Atsuhito Matsukawa ,  Katsuhiko Wakayama ,  Yoshihito Hirai

    IPC分类号： H01F1/147

    CPC分类号： H01F3/08 ,  H01F1/14766 ,  H01F1/26 ,  H01Q1/2225

    摘要： The performance index μ′×Q of a magnetic core member, in which an Fe—Si—Cr alloy is used, is further improved. A flaky soft magnetic metal powder, which is used in a magnetic core member for an RFID antenna comprising the above flaky soft magnetic metal powder and a binder, wherein it is composed of an Fe—Si—Cr alloy having an Ms (saturation magnetization)/Hc (coercive force) of 0.8 to 1.5 (mT/Am−1) in an applied magnetic field of 398 kA/m. In the present invention, it is preferable that the flaky soft magnetic metal powder consists of 7 to 23 at % of Si, 15 at % or less of Cr (excluding 0), and the balance being Fe and inevitable impurities, and that it has a weight-average particle size D50 of 5 to 30 μm and an average thickness of 0.1 to 1 μm.

    摘要翻译： 使用Fe-Si-Cr合金的磁芯部件的性能指标mu'xQ进一步提高。 一种片状软磁性金属粉末，其用于包含上述片状软磁性金属粉末和粘合剂的RFID天线用磁芯部件中，其特征在于，由具有Ms（饱和磁化强度）的Fe-Si-Cr合金构成， / Hc（矫顽力）为0.8〜1.5（mT / Am -1）在施加的磁场中为398kA / m。 在本发明中，片状软磁性金属粉末优选为Si：7〜23原子％，Cr（不包括0）为15原子％以下，余量为Fe和不可避免的杂质， 重量平均粒径D 50微米为5〜30μm，平均厚度为0.1〜1μm。

    Composite magnetic material electromagnetic wave absorbing sheet method for manufacturing sheet-like product and method for manufacturing electromagnetic wave absorbing sheet
    8.
    发明申请
    Composite magnetic material electromagnetic wave absorbing sheet method for manufacturing sheet-like product and method for manufacturing electromagnetic wave absorbing sheet 失效
    复合磁性材料电磁波吸收片制造片状产品的方法和制造电磁波吸收片的方法

    公开(公告)号：US20050012652A1

    公开(公告)日：2005-01-20

    申请号：US10494738

    申请日：2002-11-08

    申请人： Katsuhiko Wakayama ,  Masahiro Karatsu ,  Tsutomu Chou ,  Yasuo Hashimoto

    发明人： Katsuhiko Wakayama ,  Masahiro Karatsu ,  Tsutomu Chou ,  Yasuo Hashimoto

    IPC分类号： H01F1/18 ,  H01F1/24 ,  H01F1/26 ,  H01F41/02 ,  H05K9/00 ,  H01Q17/00

    CPC分类号： H05K9/0086 ,  H01F1/18 ,  H01F1/26 ,  H01F41/0246 ,  H05K9/0075

    摘要： The object of the present invention is to provide an electromagnetic wave absorbing sheet excellent in permeability in high frequencies and to provide a method for manufacturing the same. The electromagnetic wave absorbing sheet of the present invention comprises insulating layers on the both sides of a magnetic layer. The magnetic layer is formed by densely depositing a large amount of magnetic powder such that the powder undergoes plastic deformation. Each magnetic powder is made to be a composite magnetic material formed of the soft magnetic metal phase consisting of a flaky soft magnetic metal powder and the insulating phase consisting of an insulating film formed on the surface of the soft magnetic metal phase. Additionally, another configuration can be taken in which a conductive layer is arranged on one of the insulating layers arranged on both sides of the magnetic layer, and the conductive layer is covered with an insulating layer.

    摘要翻译： 本发明的目的是提供一种高频磁导率优异的电磁波吸收片，并提供其制造方法。 本发明的电磁波吸收片包括在磁性层两侧的绝缘层。 磁性层通过密集沉积大量的磁性粉末形成，使得粉末发生塑性变形。 每个磁粉被制成由软磁金属相组成的复合磁性材料，该软磁金属相是由薄片软磁金属粉末和由形成在软磁金属相表面上的绝缘膜组成的绝缘相。 此外，可以采用在布置在磁性层的两侧上的绝缘层之一上布置导电层的另一结构，并且导电层被绝缘层覆盖。

    Method for preparing iron system soft magnetic sintered body
    9.
    发明授权
    Method for preparing iron system soft magnetic sintered body 失效
    铁系软磁烧结体的制备方法

    公开(公告)号：US5443787A

    公开(公告)日：1995-08-22

    申请号：US274451

    申请日：1994-07-13

    申请人： Teruo Mori ,  Norishige Yamaguchi ,  Katsuhiko Wakayama

    发明人： Teruo Mori ,  Norishige Yamaguchi ,  Katsuhiko Wakayama

    IPC分类号： C22C33/02 ,  H01F1/22 ,  B22F1/00 ,  B22F3/12 ,  B22F9/04

    CPC分类号： H01F1/22 ,  C22C33/0207

    摘要： An iron system soft magnetic sintered body is prepared by blending an iron powder with a powder of a metal or ferroalloy so as to give a desired chemical composition and subjecting the blend to mechanical alloying, thereby alloying at least a portion of the metal or ferroalloy with iron, followed by shaping and firing. Alternatively, the same is prepared by treating an iron system alloy powder of a desired chemical composition by a mechanical grinding process, followed by shaping and firing. Even when starting with relatively large mean particle size powder, the resulting sintered body has a high density and improved magnetic properties.

    摘要翻译： 通过将铁粉与金属或铁合金的粉末混合以制备铁系软磁烧结体，以获得所需的化学组成并使共混物进行机械合金化，从而将至少一部分金属或铁合金与 铁，然后成型和烧制。 或者，通过机械研磨工艺处理所需化学成分的铁系合金粉末，然后进行成形和烧制来制备。 即使以相对大的平均粒径粉末开始，所得的烧结体也具有高密度和改善的磁特性。