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1. 发明授权

US06952325B2 Thin film magnetic head and method of manufacturing the same 有权
标题翻译：薄膜磁头及其制造方法
公开(公告)号：US06952325B2
公开(公告)日：2005-10-04
申请号：US10318153
申请日：2002-12-13
申请人： Yoshikazu Sato , Yuko Motegi , Tetsuya Roppongi , Yasuyuki Notsuke
发明人： Yoshikazu Sato , Yuko Motegi , Tetsuya Roppongi , Yasuyuki Notsuke
IPC分类号： G11B5/31 , G11B5/39 , G11B5/187
CPC分类号： G11B5/313 , G11B5/3116 , G11B5/3163 , G11B5/3967
摘要： Provided is a thin film magnetic head capable of ensuring the strength of a perpendicular magnetic field and improving recording performance. A bottom pole portion layer and a top pole portion layer constituting a part of a main magnetic pole are formed so that a cross sectional area of a complex including front end portions of the bottom pole portion layer and the top pole portion layer is smaller than a cross sectional area of a complex including rear end portions thereof, and a width of a top edge in an exposed surface is larger than a width of a bottom edge, and is equal to or larger than a width of the exposed surface in a middle position between the top edge and the bottom edge. In recording, magnetic fluxes flowing in a main magnetic pole are focused toward an air bearing surface, and are concentrated on the front end portion of the top pole portion layer which is a main emitting portion of the magnetic fluxes, so sufficient magnetic fluxes can be supplied to the air bearing surface.
摘要翻译：提供一种能够确保垂直磁场的强度并提高记录性能的薄膜磁头。形成构成主磁极的一部分的底极部分层和顶极部分层，使得包括底极部分层和顶极部分层的前端部分的复合物的截面积小于包括其后端部分的复合体的横截面积和暴露表面中的顶部边缘的宽度大于底部边缘的宽度，并且等于或大于在中间位置的暴露表面的宽度在顶边和底边之间。在记录中，在主磁极中流动的磁通量朝向空气轴承表面聚焦，并且集中在作为磁通量的主要发射部分的顶极部分层的前端部分上，因此足够的磁通量可以供应到空气轴承表面。

2. 发明授权

US5792548A Magnetic recording medium having a magnetic layer and an intermediate layer of specified composition 失效
标题翻译：具有磁性层和具有特定组成的中间层的磁记录介质
公开(公告)号：US5792548A
公开(公告)日：1998-08-11
申请号：US610094
申请日：1996-02-29
申请人： Takayoshi Kuwajima , Tsunehiko Ikarashi , Yuko Motegi
发明人： Takayoshi Kuwajima , Tsunehiko Ikarashi , Yuko Motegi
IPC分类号： G11B5/66 , C09C1/48 , C09D5/23 , C09D7/12 , G11B5/70 , G11B5/738 , G11B5/704
CPC分类号： G11B5/70 , G11B5/738 , Y10S428/90 , Y10T428/24967 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium having an intermediate layer excellent in conductivity, surface properties and strength, and excellent in electromagnetic characteristics, physical properties, etc., which comprises a non-magnetic intermediate layer having a thickness of 0.5 .mu.m to 3.0 .mu.m formed on at least one surface of a non-magnetic support, and a magnetic layer formed on the intermediate layer, the magnetic layer being mainly composed of a ferromagnetic powder and a binder and having a thickness of 0.1 .mu.m to 0.5 .mu.m, in which said magnetic layer is formed on the intermediate layer at least in a dry state, and the intermediate layer comprises (A) an inorganic material having an average particle size of 10 nm to 50 nm and a Mohs' hardness of 7 or less, (B) an inorganic material having an average particle size of 100 nm to 500 nm and a Mohs' hardness of 9 or more, (C) carbon black, a lubricant and a binder.
摘要翻译：一种具有导电性，表面性质和强度优异，电磁特性，物理性能优异的中间层的磁记录介质，其包含厚度为0.5μm至3.0μm的非磁性中间层，其形成于非磁性载体的至少一个表面和形成在中间层上的磁性层，磁性层主要由铁磁粉末和粘合剂组成，厚度为0.1μm至0.5μm，其中所述至少在干燥状态下在中间层上形成磁性层，中间层包含（A）平均粒度为10nm〜50nm，莫氏硬度为7以下的无机材料，（B）平均粒径为100nm〜500nm，莫氏硬度为9以上的无机材料，（C）炭黑，润滑剂和粘合剂。

3. 发明授权

US5698286A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5698286A
公开(公告)日：1997-12-16
申请号：US719205
申请日：1996-09-25
申请人： Tsunehiko Ikarashi , Yasufumi Takasugi , Tsutomu Aoyama , Akira Saitoh , Yuko Motegi , Takayoshi Kuwajima
发明人： Tsunehiko Ikarashi , Yasufumi Takasugi , Tsutomu Aoyama , Akira Saitoh , Yuko Motegi , Takayoshi Kuwajima
IPC分类号： G11B5/738 , G11B5/66 , B32B3/02 , G11B5/70
CPC分类号： G11B5/738 , Y10S428/90 , Y10T428/265 , Y10T428/2982
摘要： A magnetic layer is provided on a nonmagnetic base with a non-ferromagnetic layer interposed between them. Non-ferromagnetic particulate iron oxide is incorporated in the non-ferromagnetic layer. In addition to, or in place of, this iron oxide, non-structural carbon having a mean particle diameter of 10 to 60 nm, a specific surface area of 150 m2/g as measured by the BET method and a DBP oil absorption of 100 ml/100 g or less may be used. This makes it possible to achieve a magnetic recording medium having excellent surface properties and good-enough electromagnetic transducing characteristics.
摘要翻译：磁性层设置在非磁性基底上，其间插有非铁磁层。非铁磁性颗粒状氧化铁被结合在非铁磁性层中。除了或代替该氧化铁，通过BET法测定的平均粒径为10〜60nm，比表面积为150m 2 / g，DBP吸油量为100的非结构碳 ml / 100g以下。这使得可以实现具有优异的表面性能和足够好的电磁感应特性的磁记录介质。

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