公开(公告)号：US4837092A

公开(公告)日：1989-06-06

申请号：US84461

申请日：1987-08-12

申请人： Hirotaka Yokoyama ,  Tadashi Ido ,  Tatsumi Maeda ,  Shunji Kurisu

发明人： Hirotaka Yokoyama ,  Tadashi Ido ,  Tatsumi Maeda ,  Shunji Kurisu

IPC分类号： G11B5/706

CPC分类号： G11B5/70678 ,  Y10S428/90 ,  Y10T428/2982

摘要： A magnetic recording powder comprising a hexagonal barium ferrite substituted with a coercive force control element. This magnetic powder is preliminarily treated with sulfate ion-containing water so as to convert any free barium ions in the magnetic powder to a water insoluble compound such as BaSO.sub.4 or BaS.sub.2 O.sub.7. There is also proposed a magnetic recording medium having a magnetic layer containing such a magnetic powder as mentioned above.

公开(公告)号：US4407721A

公开(公告)日：1983-10-04

申请号：US304683

申请日：1981-09-22

申请人： Yoshiyasu Koike ,  Osamu Kubo ,  Tadashi Ido ,  Masanobu Uwaha

发明人： Yoshiyasu Koike ,  Osamu Kubo ,  Tadashi Ido ,  Masanobu Uwaha

IPC分类号： C01G49/00 ,  G11B5/706 ,  H01F1/11 ,  C04B35/26

CPC分类号： G11B5/70678

摘要： A process for manufacturing a hexagonal ferrite magnetic powder for a magnetic recording medium involves rapidly cooling a molten material of a glass-forming component and a hexagonal ferrite-forming component to obtain glass flakes, heating the glass flakes to precipitate ferrite fine grains, incompletely dissolving the glass flakes with an acid or boiling water, and separating and recovering the fine grains in the presence of a dispersing agent.

摘要翻译： 制造用于磁记录介质的六方晶系铁氧体磁粉的方法包括快速冷却玻璃形成组分和六方晶系铁素体形成组分的熔融材料以获得玻璃薄片，加热玻璃薄片以沉淀铁素体细晶粒，不完全溶解 玻璃用酸或沸水分散，并在分散剂存在下分离和回收细晶粒。

公开(公告)号：US4321155A

公开(公告)日：1982-03-23

申请号：US235639

申请日：1981-02-18

申请人： Youhachi Yamashita ,  Katsunori Yokoyama ,  Tadashi Ido ,  Seiichi Yoshida

发明人： Youhachi Yamashita ,  Katsunori Yokoyama ,  Tadashi Ido ,  Seiichi Yoshida

IPC分类号： C04B35/46 ,  C04B35/49 ,  H01B3/12 ,  H01L41/187

CPC分类号： H01L41/187

摘要： A piezoelectric oxide material suitable for an ultrasonic probe is provided. The piezoelectric material has the general formula ##EQU1## wherein 0.01.ltoreq.X.ltoreq.0.10 and 0.20.gtoreq.a.ltoreq.0.35, to which is added, as an additive, 0.05 to 2.0% by weight of at least one of MnO, NiO and Fe.sub.2 O.sub.3 based on the total content of the basic composition; the thickness coupling factor (Kt) is 50% or more; the ratio (Kt/Kp) of the thickness coupling factor (Kt) to the planar coupling factor (Kp) is 10 or more.

摘要翻译： 提供了适用于超声波探头的压电氧化物材料。 压电材料具有通式（Pb1-aCaa [（Co1 / 2W1 / 2）xTi1-x] O3，其中0.01≤x≤0.05且0.20≤a≤0.35， 作为添加剂，基于碱性组合物的总含量为0.05〜2.0重量％的MnO，NiO和Fe 2 O 3中的至少一种;厚度耦合系数（Kt）为50％以上;比例（Kt / Kp） 的厚度耦合系数（Kt）与平面耦合系数（Kp）的关系为10以上。

公开(公告)号：US4425401A

公开(公告)日：1984-01-10

申请号：US393789

申请日：1982-06-30

申请人： Tadashi Ido ,  Hirotaka Yokoyama ,  Moriyasu Wada ,  Toshihiko Oguchi ,  Akio Ishizawa ,  Yoshiyasu Koike

发明人： Tadashi Ido ,  Hirotaka Yokoyama ,  Moriyasu Wada ,  Toshihiko Oguchi ,  Akio Ishizawa ,  Yoshiyasu Koike

IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/70 ,  G11B5/706 ,  G11B5/714 ,  G11B5/845 ,  H01F10/02

CPC分类号： G11B5/70 ,  G11B5/70678 ,  G11B5/714 ,  G11B5/845 ,  Y10S428/90 ,  Y10T428/257 ,  Y10T428/258

摘要： Disclosed is a magnetic recording medium comprising substrate and a resinous composition containing magnetic particles of uniaxially-anisotropic hexagonal crystals having particle diameters of 0.01.about.0.3 .mu.m and coated on said substrate; the ratio of remanent magnetization to saturation magnetization on the magnetization curve corrected to demagnetizing field which is measured in a direction vertical to the surface of the recording medium, ranging from 0.3 to 0.7. This magnetic recording medium requires no orientation treatment for its production.

摘要翻译： 公开了一种磁性记录介质，其包含基材和含有粒径为0.01μm×0.3μm并涂覆在所述基材上的单轴 - 各向异性六方晶体的磁性颗粒的树脂组合物; 对磁化曲线校正为在与记录介质表面垂直的方向上测量的退磁场的磁化强度与饱和磁化强度之比为0.3至0.7。 该磁记录介质不需要用于其生产的取向处理。