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公开(公告)号：US4990361A
公开(公告)日：1991-02-05
申请号：US403075
申请日：1989-08-28
申请人： Tadashi Yasunaga , Akio Yanai , Koji Sasazawa
发明人： Tadashi Yasunaga , Akio Yanai , Koji Sasazawa
CPC分类号： G11B5/85
摘要： A method and apparatus for producing a magnetic recording medium having an improved durability with a simple process. Nitrogen molecules and/or nitrogen atoms in an excited state are applied to a nonmagnetic substrate simultaneously with an iron vapor flow and an ion flow. The resulting magnetic recording medium has superior corrosion resistance and can be produced at a high film forming rate, and is especially suitable for high density recording because of its high coercive force.
摘要翻译： 一种以简单的工艺制造具有改善的耐久性的磁记录介质的方法和装置。 处于激发态的氮分子和/或氮原子与铁蒸气流和离子流同时施加到非磁性基底上。 所得到的磁记录介质具有优异的耐腐蚀性，并且可以以高的成膜速度生产，并且由于其高矫顽力而特别适用于高密度记录。
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2.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：US5370928A
公开(公告)日：1994-12-06
申请号：US826418
申请日：1992-01-27
申请人： Makoto Funabashi , Naoto Abe , Koji Sasazawa
发明人： Makoto Funabashi , Naoto Abe , Koji Sasazawa
CPC分类号： G11B5/66 , Y10S428/90 , Y10T428/12465 , Y10T428/12931 , Y10T428/265
摘要： A magnetic recording medium providing a high reproducing output and a high C/N over a wide recording frequency region is disclosed. The magnetic recording medium comprises a non-magnetic substrate and a lower magnetic layer, a non-magnetic intermediate layer and an upper magnetic layer on the substrate in this order so that the ratio of the non-magnetic intermediate layer thickness (t) to the upper magnetic layer thickness (d), i.e., (t/d), is within the range of 0.1/1 to 0.3/1.
摘要翻译： 公开了一种在宽的记录频率区域提供高再现输出和高C / N的磁记录介质。 磁记录介质依次包括基板上的非磁性基板和下部磁性层，非磁性中间层和上部磁性层，使得非磁性中间层厚度（t）与 上磁层厚度（d），即（t / d）在0.1 / 1至0.3 / 1的范围内。
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公开(公告)号：US4923748A
公开(公告)日：1990-05-08
申请号：US179924
申请日：1988-04-11
申请人： Tadashi Yasunaga , Akio Yanai , Koji Sasazawa
发明人： Tadashi Yasunaga , Akio Yanai , Koji Sasazawa
CPC分类号： G11B5/653 , Y10S428/90 , Y10T428/265
摘要： A durable, weather-resistant and anti-corrosive magnetic recording medium is disclosed, which comprises a non-magnetic support having coated thereon a thin film type magnetic layer comprising iron, nitrogen oxygen and at least one element selected from the group consisting of titanium, silicon, aluminum and tantalum.
摘要翻译： 公开了一种耐用，耐候和抗腐蚀的磁记录介质，其包括其上涂覆有薄膜型磁性层的非磁性载体，所述薄膜型磁性层包含铁，氮氧和选自钛， 硅，铝和钽。
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公开(公告)号：US4267207A
公开(公告)日：1981-05-12
申请号：US39028
申请日：1979-05-14
CPC分类号： G11B5/70694 , C01G49/02 , G11B5/70642 , C01P2006/42
摘要： A process for producing a cobalt-containing ferromagnetic iron oxide powder suitable for magnetic recording which comprises(a) mixing cobalt ion, ferrous ion and an alkali with an aqueous dispersion of acicular ferromagnetic iron oxide nuclei under non-oxidizing conditions at a temperature of about 50.degree. C. or less;(b) heating the dispersion to a temperature of at least about 60.degree. C. but below the boiling point of the dispersion under non-oxidizing conditions to cause a reaction; and(c) treating the dispersion at a temperature of at least about 60.degree. C. but below the boiling point of the dispersion under the following conditions:(1) initially treating the dispersion under non-oxidizing conditions for about 5 minutes or more;(2) subsequentially treating the dispersion under oxidizing conditions for about 5 minutes or more prior to the termination of the reaction; and(3) a total treating time under non-oxidizing conditions and oxidizing conditions of at least about 30 minutes.
摘要翻译： 一种适用于磁记录的含钴铁磁性氧化铁粉末的制造方法，其特征在于，包括：（a）在非氧化条件下，将钴离子，亚铁离子和碱与针状铁磁性氧化铁核的水分散体混合， 50℃以下; （b）在非氧化条件下将分散体加热到至少约60℃但低于分散体的沸点以引起反应; 和（c）在以下条件下，在至少约60℃但低于分散体沸点的温度下处理分散体：（1）最初在非氧化条件下处理分散体约5分钟或更长时间; （2）在反应终止之前，在氧化条件下将分散体顺序处理约5分钟或更长时间; 和（3）在非氧化条件和氧化条件下的总处理时间为至少约30分钟。
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6.发明授权Process for producing ferrogmagnetic iron oxide powder comprising a pre-treatment with a reducing agent 失效包含用还原剂进行预处理的铁磁性氧化铁粉末的制造方法
公开(公告)号：US4125474A
公开(公告)日：1978-11-14
申请号：US710813
申请日：1976-08-02
CPC分类号： G11B5/70673 , G11B5/70642
摘要： In a process for producing a ferromagnetic powder having a high coercive force which comprises adding an aqueous solution containing Co.sup.+2 ions, or both Co.sup.+2 ions and another cation(s), and an alkali solution to a suspension of a ferromagnetic iron oxide containing the metal(s) given by these ion(s), the improvement wherein said ferromagnetic iron oxide is treated with a reducing agent prior to the preparation of the suspension.
摘要翻译： 在制备具有高矫顽力的铁磁性粉末的方法中，该方法包括将含有Co +2离子或Co + 2离子和另一种阳离子的水溶液和碱溶液加入到铁磁性氧化铁 含有这些离子给出的金属的改进，其中所述铁磁性氧化铁在制备悬浮液之前用还原剂处理。
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7.发明授权
公开(公告)号：US4066564A
公开(公告)日：1978-01-03
申请号：US702171
申请日：1976-07-02
CPC分类号： G11B5/70694 , C01G49/06 , C01G49/08 , G11B5/70673 , G11B5/70689 , C01P2006/42
摘要： A Co- and Fe-containing ferromagnetic iron oxide powder having a high coercive force and improved stability to heat and pressure is produced by adding an aqueous alkali solution, an aqueous solution containing Co.sup.+2 ions, and an aqueous solution containing not more than 1 equivalent, based on the Co.sup.+2 ions, of Fe ions to a suspension of ferromagnetic iron oxide, and heating the mixture at a temperature of at least 80.degree. C in the presence of an oxidizing agent. The ferromagnetic iron oxide powder is especially suitable for producing magnetic recording media.
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8.发明授权Process for stabilization of ferromagnetic material and magnetic recording member 失效强磁性材料和磁记录元件的稳定化工艺
公开(公告)号：US4015030A
公开(公告)日：1977-03-29
申请号：US591681
申请日：1975-06-30
申请人： Koji Sasazawa , Yasuyuki Yamada , Tatsuji Kitamoto , Goro Akashi
发明人： Koji Sasazawa , Yasuyuki Yamada , Tatsuji Kitamoto , Goro Akashi
CPC分类号： G11B5/70694
摘要： A process for stabilizing a ferromagnetic material comprising heat-treating a needle-like ferromagnetic material represented by the formula MO.sub.x wherein M is a ferromagnetic metal ion or a ferromagnetic non-metal ion and another metal ion, and x is the degree of oxidation which ranges from 1.36 to 1.47, and containing at least 0.5 atom % Co, at a temperature of at least about 40.degree. C, and a process for stabilizing a magnetic recording member comprising heat-treating a magnetic recording member produced by providing a ferromagnetic recording layer comprising (a) a ferromagnetic material represented by the formula MO.sub.x wherein M and x are the same as defined above, and containing at least 0.5 atom % Co, and (b) a binder, on a support, at a temperature of at least about 40.degree. C.
摘要翻译： 一种用于稳定铁磁材料的方法，包括热处理由式MOx表示的针状铁磁材料，其中M是铁磁金属离子或铁磁性非金属离子和另一种金属离子，x是氧化程度 1.36至1.47，并且在至少约40℃的温度下含有至少0.5原子％的Co，以及用于稳定磁性记录元件的方法，该方法包括热处理通过提供铁磁性记录层产生的磁性记录元件，所述磁性记录元件包括 （a）由式MOx表示的铁磁材料，其中M和x与上述定义相同，并且在载体上至少包含至少约40的温度下含有至少0.5原子％的Co和（b）粘合剂 DEG C.
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9.发明授权
公开(公告)号：US4982302A
公开(公告)日：1991-01-01
申请号：US179352
申请日：1988-04-08
CPC分类号： G11B5/02 , G11B5/00 , G11B5/716 , G11B5/78 , H04N5/78213
摘要： A method for magnetic recording and reproduction comprising the steps of: (1) magnetically multiple-recording signals on a magnetic recording medium comprising a support having thereon an upper magnetic recording layer comprising barium ferrite having an increased coercive force at 60.degree. C. or more and a lower magnetic recording layer comprising at least one of chromium dioxide and Co-modified iron oxide, having a decreased coercive force at 60.degree. C. or more, disposed between said upper magnetic recording layer and said support; (2) heating said magnetic recording layers prior to reproduction due to a reproducing head; and (3) reproducing said magnetically recorded signal from said heated magnetic recording medium which is multiple-recorded.
摘要翻译： 一种用于磁记录和再现的方法，包括以下步骤：（1）磁记录介质上的磁记录信号，该磁记录介质包括一个载体，其上有一个上磁记录层，该磁记录层包括在60℃以上矫顽力增加的钡铁氧体 以及设置在所述上部磁记录层和所述支撑体之间的包含二氧化铬和Co改性氧化铁中的至少一种，具有降低的矫顽力在60℃以上的低磁记录层; （2）由于再现头而在再现之前加热所述磁记录层; 和（3）从被记录的多个加热磁记录介质再现所述磁记录信号。
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公开(公告)号：US4956229A
公开(公告)日：1990-09-11
申请号：US175466
申请日：1988-03-30
申请人： Tadashi Yasunaga , Akio Yanai , Koji Sasazawa , Makoto Nagao
发明人： Tadashi Yasunaga , Akio Yanai , Koji Sasazawa , Makoto Nagao
CPC分类号： G11B5/653 , Y10S428/90 , Y10T428/265
摘要： A durable, rust- and scratch-resistant magnetic recording medium coated thereon a thin ferromagnetic film comprising an iron oxide nitride, wherein said film is an aggregation of pillar particles of said iron oxide nitride, said particles having a higher nitrogen content on their surface than inside the particles.
摘要翻译： 在其上涂覆有包含氧化铁氮化物的薄铁磁膜的耐久，防锈和耐划伤的磁记录介质，其中所述膜是所述氧化铁氮化物的柱状颗粒的聚集体，所述颗粒在其表面上具有较高的氮含量， 颗粒内
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