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公开(公告)号：US4486496A
公开(公告)日：1984-12-04
申请号：US382337
申请日：1982-05-26
IPC分类号： G11B5/70 , C09D5/23 , C09D7/12 , G11B5/02 , G11B5/706 , G11B5/714 , H01F1/11 , G11B5/68 , B32B5/16
CPC分类号： G11B5/706 , G11B5/714 , G11B5/02 , Y10S428/90 , Y10T428/256 , Y10T428/257
摘要： A magnetic recording medium which comprises a non-magnetic support having thereon a magnetic layer containing plate-shaped magnetic particles which have axes of easy magnetization perpendicular to their respective plate planes dispersed in a binder, the magnetic particles each having a multiple magnetic domain structure and having a particle diameter equal to or longer than the recorded effective shortest wavelength.
摘要翻译： 一种磁记录媒体，其特征在于，具有非磁性支持体，上述磁性层含有板状磁性粒子，所述磁性粒子具有易分散在粘合剂中的各自平板平面的磁化强度的方向，所述磁性粒子各自具有多个磁畴结构， 具有等于或大于所记录的有效最短波长的粒径。
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公开(公告)号：US4442159A
公开(公告)日：1984-04-10
申请号：US382336
申请日：1982-05-26
CPC分类号： G11B5/716 , Y10S428/90 , Y10T428/24942 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium which comprises a non-magnetic support having thereon two or more magnetic layers comprising magnetic particles in a binder. The magnetic layer(s) other than the topmost layer comprises needle-shaped magnetic particles. The topmost layer comprises plate-shaped magnetic particles which have axes of easy magnetization perpendicular to the individual plate planes and the plate planes are oriented substantially parallel to the surface of the magnetic layer.
摘要翻译： 一种磁记录介质，其包括其上具有两个或更多个包含粘合剂中的磁性颗粒的磁性层的非磁性载体。 除了最上层之外的磁性层包括针状磁性颗粒。 最顶层包括板状磁性颗粒，其具有垂直于各个板平面的易磁化的轴，并且板平面基本上平行于磁性层的表面取向。
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公开(公告)号：US4666773A
公开(公告)日：1987-05-19
申请号：US585023
申请日：1984-03-05
申请人： Tatsuji Kitamoto , Goro Akashi
发明人： Tatsuji Kitamoto , Goro Akashi
CPC分类号： G11B5/70 , G11B5/845 , G11B5/852 , Y10S428/90 , Y10T428/26 , Y10T428/31678
摘要： In a magnetic recording medium comprising a non-magnetic support and a magnetic recording layer coated thereon in which ferromagnetic particles are dispersed in a binder, the ferromagnetic particles are given a magnetic anisotropy by a magnetic annealing treatment and the direction of the magnetic anisotropy is vertical mainly to the recording surface. Thus, the vertical magnetization recording is improved.
摘要翻译： 在包含非磁性载体和涂覆有磁性体的磁记录层的磁记录介质中，铁磁颗粒分散在粘合剂中，铁磁颗粒通过磁性退火处理被赋予磁各向异性，并且磁各向异性方向垂直 主要是记录面。 因此，提高了垂直磁化记录。
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公开(公告)号：US4520069A
公开(公告)日：1985-05-28
申请号：US375691
申请日：1982-05-06
申请人： Tatsuji Kitamoto , Goro Akashi
发明人： Tatsuji Kitamoto , Goro Akashi
CPC分类号： G11B5/714 , G11B5/845 , G11B5/852 , Y10S428/90 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： In a magnetic recording medium comprising a non-magnetic support and a magnetic recording layer coated thereon in which ferromagnetic particles are dispersed in a non-magnetic binder, an improvement consists in that the ferromagnetic particles have a mean particle length of at most 0.3 microns with a length to width ratio of more than 1 but at most 3 and optionally are subjected to an orientation treatment in a magnetic field in the vertical direction to the recording surface.
摘要翻译： 在包含非磁性载体和涂覆有磁性颗粒的非磁性粘结剂中的磁记录层的磁记录介质中，其改进在于，铁磁性颗粒的平均颗粒长度至多为0.3微米， 长宽比大于1但大于3，并且任选地在与记录表面垂直的方向上的磁场中进行取向处理。
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公开(公告)号：US4678682A
公开(公告)日：1987-07-07
申请号：US496734
申请日：1983-05-20
CPC分类号： G11B5/845
摘要： The perpendicular magnetic orientation of a magnetic layer containing platelet-form ferromagnetic particles coated on a web support is effectively performed by passing a web having thereon the coated magnetic layer in an undried state through a magnetic field formed by plural pairs of opposite pole type magnets disposed in the travelling direction of the web with a gap between adjacent pairs of magnets, while supplying drying air through each gap onto the surface of the travelling web to substantially complete the drying of the coated layer while the web is in the magnetic field. A partition may be inserted in each gap so that the lower end of the partition is close to the upper surface of the travelling web to divide the gap into a front section and a back section, and the drying air may be passed through these sections.
摘要翻译： 通过使其上具有涂覆的磁性层的卷材在未干燥状态下通过由多对成对的相对极型磁体形成的磁场而使包含在片状载体上的含有片状铁磁颗粒的磁性层的磁性层的垂直磁性取向 在相邻成对的磁体之间具有间隙的幅材的行进方向上，同时通过每个间隙将干燥空气提供到行进幅材的表面上，以在幅材处于磁场的同时基本上完成涂覆层的干燥。 可以在每个间隙中插入隔板，使得隔板的下端靠近行进网的上表面，以将间隙分成前部和后部，并且干燥空气可以通过这些部分。
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公开(公告)号：US4439795A
公开(公告)日：1984-03-27
申请号：US329098
申请日：1981-12-09
申请人： Tatsuji Kitamoto , Goro Akashi
发明人： Tatsuji Kitamoto , Goro Akashi
CPC分类号： G11B5/70626 , Y10T428/12049
摘要： A magnetic recording medium is described having formed on a non-magnetic base at least two magnetic layers, each of the magnetic layers comprising ferromagnetic particles dispersed in a binder, wherein the ferromagnetic particles in the outermost layer have an average length of 0.3.mu. or less and a length to width ratio of greater than 1/1 but not greater than 3/1, and the ferromagnetic particles in an underlying layer have a length to width ratio of more than 3/1.
摘要翻译： 描述了在非磁性基底上形成至少两个磁性层的磁记录介质，每个磁性层包含分散在粘合剂中的铁磁颗粒，其中最外层中的铁磁颗粒具有0.3μm或更小的平均长度 并且长宽比大于1/1但不大于3/1，底层中的铁磁颗粒的长宽比大于3/1。
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公开(公告)号：US4368237A
公开(公告)日：1983-01-11
申请号：US38620
申请日：1979-05-14
申请人： Yasuyuki Yamada , Tatsuji Kitamoto , Goro Akashi
发明人： Yasuyuki Yamada , Tatsuji Kitamoto , Goro Akashi
CPC分类号： G11B5/7022 , Y10S428/90 , Y10T428/31511 , Y10T428/31609 , Y10T428/31725 , Y10T428/31935
摘要： A magnetic recording material having superior abrasion resistance and thermal stability is produced by coating a magnetic coating composition consisting essentially of aqueous emulsions of at least two resin binders capable of reacting with each other upon mixing, and being present therein in the separated state, and a ferromagnetic powder on a non-magnetic support, drying the coating, and curing the resulting magnetic recording layer where drying is insufficient to effect curing. Hazards ascribable to the use of organic solvents in conventional techniques can be obviated by this invention.
摘要翻译： 具有优异的耐磨性和热稳定性的磁记录材料通过涂覆基本上由至少两种混合后能够彼此反应并且以分离状态存在的树脂粘合剂的水乳液组成的磁性涂料组合物， 铁磁粉末在非磁性载体上，干燥涂层，并固化所得到的磁记录层，其中干燥不足以实现固化。 本发明可以避免归因于常规技术中使用有机溶剂的危害。
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8.发明授权Process for preparing magnetic iron oxide and magnetic iron oxide produced thereby 失效由此制备磁性氧化铁和磁性氧化铁的方法
公开(公告)号：US4200680A
公开(公告)日：1980-04-29
申请号：US586443
申请日：1975-06-12
申请人： Koji Sasazawa , Shigeo Komine , Tatsuji Kitamoto , Goro Akashi
发明人： Koji Sasazawa , Shigeo Komine , Tatsuji Kitamoto , Goro Akashi
CPC分类号： G11B5/70673 , Y10S428/90 , Y10T428/2991
摘要： A magnetic iron oxide having a large coercive force and an improved squareness ratio prepared by coating the surface of needle-like particles of magnetic iron oxide with a cobalt compound, placing the coated iron oxide particles in a unidirectionally oriented magnetic field thereby orienting the particles in the direction of the magnetic field, and heat-treating the needle-like particles in this state with the application of an external magnetic field, or heat-treating the needle-like particles in a magnetized state.
摘要翻译： 通过用钴化合物涂覆磁性氧化铁的针状颗粒的表面而制备的具有大的矫顽力和改善的矩形比的磁性氧化铁，将涂覆的氧化铁颗粒置于单向取向的磁场中，从而使颗粒定向 磁场的方向，在这种状态下通过施加外部磁场对针状颗粒进行热处理，或者将针状颗粒热处理为磁化状态。
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公开(公告)号：US4513054A
公开(公告)日：1985-04-23
申请号：US585020
申请日：1984-03-05
申请人： Tatsuji Kitamoto , Goro Akashi
发明人： Tatsuji Kitamoto , Goro Akashi
CPC分类号： G11B5/852 , G11B5/716 , Y10S428/90 , Y10T428/257 , Y10T428/265
摘要： In a magnetic recording medium comprising a non-magnetic support and two or more magnetic recording layers containing ferromagnetic particles dispersed in a non-magnetic binder, the ferromagnetic particles of the outermost magnetic layer are given a main magnetic anisotropy by a magnetic annealing treatment and the direction of the magnetic anisotropy is vertical to the recording surface. Thus, the vertical magnetization recording is improved.
摘要翻译： 在包含非磁性载体和包含分散在非磁性粘合剂中的铁磁颗粒的两个或更多个磁记录层的磁记录介质中，最外磁层的铁磁颗粒通过磁退火处理被赋予主磁各向异性， 磁各向异性的方向垂直于记录表面。 因此，提高了垂直磁化记录。
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公开(公告)号：US4503119A
公开(公告)日：1985-03-05
申请号：US325939
申请日：1981-11-30
CPC分类号： H01F41/14 , G11B5/64 , G11B5/725 , Y10S428/90 , Y10T428/265 , Y10T428/273
摘要： A magnetic recording medium which is characterized by a lubricant present in channels diagonally extending through a magnetic metal thin film having a columnar structure formed by vapor deposition; this medium possesses improved running properties and abrasion resistance which last for an extended period of time.
摘要翻译： 一种磁记录介质，其特征在于存在于通过气相沉积形成的具有柱状结构的磁性金属薄膜的对角延伸的通道中的润滑剂; 该介质具有改善的运行性能和耐磨性，持续较长时间。
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