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21. 发明授权

US5156922A Acicular magnetic iron based alloy particles for magnetic recording and method of producing the same 失效
标题翻译：用于磁记录的基于磁性铁的合金颗粒及其制造方法
公开(公告)号：US5156922A
公开(公告)日：1992-10-20
申请号：US728328
申请日：1991-07-08
申请人： Akio Mishima , Mamoru Tanihara , Yasutaka Ota , Hirofumi Kawasaki , Kenji Okinaka , Kunio Ikemoto , Kousaku Tamari , Kohji Mori , Norimichi Nagai
发明人： Akio Mishima , Mamoru Tanihara , Yasutaka Ota , Hirofumi Kawasaki , Kenji Okinaka , Kunio Ikemoto , Kousaku Tamari , Kohji Mori , Norimichi Nagai
IPC分类号： G11B5/706
CPC分类号： G11B5/70615 , Y10T428/12181
摘要： Disclosed herein are acicular magnetic iron based alloy particles for magnetic recording, containing 1.5 to 10 mol % of B based on Fe (calculated as B) and 1.5 to 10 mol % of Co based on Fe (calculated as Co) in the vicinity of the surfaces of said particles and having a saturation magnetization of not less than 125 emu/g and an S.F.D. value of not more than 0.50, and a process for producing the same.

22. 发明授权

US5150511A Method for manufacturing a magnetic transducer head 失效
标题翻译：制造磁性传感器头的方法
公开(公告)号：US5150511A
公开(公告)日：1992-09-29
申请号：US708388
申请日：1991-05-31
申请人： Katsumi Sakata , Tatsuo Kumura , Atsushi Suzuki , Yoshito Ikeda , Kaoru Aoki , Naoto Kojima , Akio Mishima
发明人： Katsumi Sakata , Tatsuo Kumura , Atsushi Suzuki , Yoshito Ikeda , Kaoru Aoki , Naoto Kojima , Akio Mishima
IPC分类号： G11B5/127 , G11B5/187 , G11B5/23
CPC分类号： G11B5/232 , G11B5/1272 , G11B5/187 , Y10T29/49055
摘要： A method for manufacturing a magnetic transducer head in which a track width regulating grooves provided on both edges of a magnetic gap are filled by blowing a powder beam of nonmagnetic material having a very fine particle size to deposit the nonmagnetic material in the grooves. A pair of magnetic core members are bonded together to form a magnetic gap therebetween by providing a metal layer of a bonding surface of the core members and applying a pressure to the core members under an elevated temperature to cause a mutual diffusion of the metal to bond the core members together. Thus the magnetic transducer head can be made without using a high-temperature heat treatment.

23. 发明授权

US4858048A Complex magnetic transducer head of single magnetic pole type for perpendicular mode recording 失效
标题翻译：单磁极型复磁传感器头用于垂直模式记录
公开(公告)号：US4858048A
公开(公告)日：1989-08-15
申请号：US85322
申请日：1987-08-10
申请人： Kiyonori Hayakawa , Akio Mishima
发明人： Kiyonori Hayakawa , Akio Mishima
IPC分类号： G11B5/127
CPC分类号： G11B5/1278
摘要： A complex magnetic transducer head with a single magnetic pole includes a recording and reproducing main magnetic pole made of a thin film of soft magnetic material with a predetermined width and in contact with a magnetic recording medium. A non-magnetic guard member is adjacent each side of the recording and reproducing main magnetic pole and a magnetic core portion is integrated with each guard member. Grooves are formed in the magnetic core portion for separating a first auxiliary magnetic pole portion in contact with the recording and reproducing main magnetic pole from a magnetic flux return path portion. The winding is wound around the recording reproducing main magnetic pole through the grooves. An erasing head portion having a pair of erasing main magnetic poles faces the magnetic record medium and is spaced from the recording and reproducing main magnetic pole by a predetermined distance along the running direction of the magnetic record medium, and the pair of erasing main magnetic poles are spaced apart in a direction transverse to the running direction by a distance smaller than the width of the recording and reproducing main magnetic pole. A erasing winding is provided for exciting the erasing main magnetic poles. Previously recorded data on the magnetic record medium is erased, despite small displacements which may occur between the previously recorded track on the magnetic record medium and the recording and reproducing main magnetic pole.
摘要翻译：具有单个磁极的复合磁传感器头包括由具有预定宽度的软磁材料薄膜制成的与磁记录介质接触的记录和再现主磁极。非磁性保护构件与记录和再现主磁极的每一侧相邻，并且磁芯部分与每个防护构件一体化。沟槽形成在磁芯部分中，用于从磁通返回路径部分分离与记录和再现主磁极接触的第一辅助磁极部分。绕组通过凹槽缠绕在记录再现主磁极上。具有一对擦除主磁极的擦除头部部分面向磁记录介质，并且与记录和再现主磁极沿着磁记录介质的运行方向隔开预定距离，并且一对擦除主磁极在横向于运行方向的方向上间隔开距离小于记录和再现主磁极的宽度的距离。提供擦除绕组以激励擦除主磁极。尽管在磁记录介质上的先前记录的轨道与记录和再现主磁极之间可能发生较小位移，但是磁记录介质上的先前记录的数据被擦除。

24. 发明授权

US4773931A Spindle ferromagnetic alloy particles 失效
标题翻译：主轴铁磁合金颗粒
公开(公告)号：US4773931A
公开(公告)日：1988-09-27
申请号：US8113
申请日：1987-01-23
申请人： Akio Mishima , Yosiro Okuda , Hiroshi Sumita , Yoshitaka Yoshinaga , Akira Mukaizaka , Tokihiro Kurata
发明人： Akio Mishima , Yosiro Okuda , Hiroshi Sumita , Yoshitaka Yoshinaga , Akira Mukaizaka , Tokihiro Kurata
IPC分类号： B22F9/22 , C22C33/02 , G11B5/706 , H01F1/06 , B22F1/00
CPC分类号： B22F9/22 , C22C33/0257 , G11B5/70615 , H01F1/065
摘要： Disclosed herein is spindle ferromagnetic alloy particles having the aspect ratio (major:minor) of less than 3:1 and the coercive force of 500 to 100 Oe, and containing 0.1 to 13 atomic % of Si to Fe, and a process for producing the same.
摘要翻译：本文公开了具有小于3:1的纵横比（主要：次要）小于3:1的矫顽力和500至100Oe的矫顽力并且含有0.1至13原子％的Si与Fe的锭心铁磁合金颗粒，以及用于制备相同。

25. 发明授权

US4437881A Acicular ferromagnetic alloy particles and process for producing said particles 失效
标题翻译：针状铁磁合金颗粒及其制备方法
公开(公告)号：US4437881A
公开(公告)日：1984-03-20
申请号：US513866
申请日：1983-07-14
申请人： Akio Mishima , Yoshiro Okuda , Tosiharu Harada , Akira Mukaizaka , Tomoyuki Imai
发明人： Akio Mishima , Yoshiro Okuda , Tosiharu Harada , Akira Mukaizaka , Tomoyuki Imai
IPC分类号： G11B5/706 , B22F9/22
CPC分类号： G11B5/70615
摘要： Acicular ferromagnetic alloy particles doped with silicon, chromium and nickel and optionally magnesium and a process for producing said particles comprising heating at 300.degree. to 500.degree. C. under reducing atmosphere acicular particles of .alpha.-iron(III) oxide hydroxide doped with silicon, chromium and nickel and optionally magnesium or acicular particles of .alpha.-ferric oxide doped with silicon, chromium and nickel and optionally magnesium obtained by dehydrating the acicular particles of .alpha.-iron(III) oxide hydroxide doped with silicon, chromium and nickel and optionally magnesium are disclosed herein.
摘要翻译：掺杂有硅，铬和镍以及任选的镁的针状铁磁性合金颗粒和一种制备所述颗粒的方法，包括在还原性气氛下在300℃至500℃下加热掺杂有硅，铬（III）的α-铁氧化物氢氧化物的针状颗粒公开了镍和任选的掺有硅，铬和镍的α-氧化铁的镁或针状颗粒和任选的镁，其通过使掺杂有硅，铬和镍以及任选的镁的α-铁（III）氧化物氢氧化物的针状颗粒脱水获得，这里。

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