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1. 发明授权

US4108787A Process for producing ferromagnetic iron oxide 失效
标题翻译：制备铁磁性氧化铁的方法
公开(公告)号：US4108787A
公开(公告)日：1978-08-22
申请号：US642826
申请日：1975-12-22
申请人： Kouichi Masaki , Teruya Shinjo , Yasuo Tamai , Tatsuji Kitamoto
发明人： Kouichi Masaki , Teruya Shinjo , Yasuo Tamai , Tatsuji Kitamoto
IPC分类号： C01G49/06 , G11B5/706
CPC分类号： C01G49/06 , G11B5/70652 , G11B5/70657 , G11B5/70673 , G11B5/70694 , C01P2002/52 , C01P2002/80 , C01P2004/10 , C01P2004/62 , C01P2006/42
摘要： In ferromagnetic powders mainly composed of iron oxide, the ferromagnetic iron oxide(s) comprise a superparamagnetic material which provides a peak showing superparamagnetism by measurement of the Mossbauer Effect spectrum. The ferromagnetic iron oxides are suitable for making highly sensitive magnetic recording media having excellent frequency response with lowered modulation noise.
摘要翻译：在主要由铁氧化物组成的铁磁粉末中，铁磁性氧化铁包括超顺磁性材料，其通过测量莫斯鲍效应光谱提供了显示超顺磁性的峰。铁磁铁氧化物适用于制造具有优异频率响应且调制噪声降低的高灵敏度磁记录介质。

2. 发明授权

US4135218A Magnetic recording and reproducing apparatus 失效
标题翻译：磁记录和再现设备
公开(公告)号：US4135218A
公开(公告)日：1979-01-16
申请号：US687821
申请日：1976-05-19
申请人： Matsuaki Nakamura , Tatsuji Kitamoto , Yasuo Tamai , Koshu Kurokawa
发明人： Matsuaki Nakamura , Tatsuji Kitamoto , Yasuo Tamai , Koshu Kurokawa
IPC分类号： G11B5/48 , G11B5/53 , G11B5/55 , G11B5/14 , G11B5/12
CPC分类号： G11B5/531 , G11B5/488 , G11B5/5521
摘要： A magnetic recording and reproducing apparatus provided with a magnetic head device comprising a supporting means having a recording magnetic head made of an alloy system magnetic material and a reproducing magnetic head made of a ferrite system magnetic material. The recording and reproducing heads are fixed relative to one another thereby eliminating the need for completely separate head mechanisms and for complex mechanisms to reliably interchange the positions of the two heads relative to the recording medium.
摘要翻译：一种具有磁头装置的磁记录和再现装置，包括具有由合金系磁性材料制成的记录磁头的支撑装置和由铁氧体系磁性材料制成的再现磁头。记录和再现头相对固定，从而不需要完全分离的头部机构，并且用于复杂的机构可靠地将两个头部相对于记录介质的位置交换。

3. 发明授权

US4410565A Method of making a magnetic recording medium 失效
标题翻译：制造磁记录介质的方法
公开(公告)号：US4410565A
公开(公告)日：1983-10-18
申请号：US352224
申请日：1982-02-25
申请人： Tatsuji Kitamoto , Ryuji Shirahata , Yasuo Tamai
发明人： Tatsuji Kitamoto , Ryuji Shirahata , Yasuo Tamai
IPC分类号： G11B5/66 , C09D167/00 , G11B5/64 , G11B5/65 , G11B5/738 , G11B5/84 , G11B5/851 , H01F41/20 , H01F10/02
CPC分类号： H01F41/20 , G11B5/64 , G11B5/84 , G11B5/851
摘要： A magnetic recording medium comprising a substrate, a thermoplastic prime coat provided thereon, and a ferromagnetic metal layer having columnar grains which at least partially penetrate into the prime coat from the top thereof and are integrated therewith. The medium is prepared by applying a prime coat onto a substrate, forming a magnetic metal layer having columnar grains by vapor deposition, and then heating and pressing the obtained combination.
摘要翻译：一种磁记录介质，包括基底，其上提供的热塑性底涂层，以及具有至少部分地从其顶部渗透到底涂层中并与其一体化的柱状颗粒的强磁性金属层。通过将基底涂布在基板上，通过气相沉积形成具有柱状晶粒的磁性金属层，然后加热并压制所得到的组合来制备介质。

4. 发明授权

US4354908A Process for the production of magnetic recording members 失效
标题翻译：制造磁记录部件的方法
公开(公告)号：US4354908A
公开(公告)日：1982-10-19
申请号：US923752
申请日：1978-07-11
申请人： Ryuji Shirahata , Tatsuji Kitamoto , Yasuo Tamai , Masaaki Suzuki
发明人： Ryuji Shirahata , Tatsuji Kitamoto , Yasuo Tamai , Masaaki Suzuki
IPC分类号： C23C14/32 , G11B5/85 , H01F41/14 , H01F41/20 , C23C15/00
CPC分类号： H01F41/14
摘要： A process for the production of a magnetic recording member which comprises effecting electric field vapor deposition under conditions such that the angle of incidence at which the vapor beam of a ferromagnetic metal strikes a support is at least about 50.degree. and the electric field between the support and a vaporization source is at least about 5 kv/m.
摘要翻译：一种用于制造磁记录部件的方法，包括在使铁磁金属的蒸气束撞击载体的入射角至少为约50°的条件下进行电场气相沉积，并且支撑体并且蒸发源为至少约5kv / m。

5. 发明授权

US4141763A Process for production of ferromagnetic powder and apparatus therefor 失效
标题翻译：铁磁粉末生产方法及其设备
公开(公告)号：US4141763A
公开(公告)日：1979-02-27
申请号：US784747
申请日：1977-04-05
申请人： Masashi Aonuma , Yasuo Tamai , Tatsuji Kitamoto , Fumio Kodama
发明人： Masashi Aonuma , Yasuo Tamai , Tatsuji Kitamoto , Fumio Kodama
IPC分类号： B22F9/24 , H01F1/06
CPC分类号： B22F9/24 , H01F1/065
摘要： A process for producing a ferromagnetic powder comprising injecting a stream of an aqueous solution of a metal salt capable of forming a ferromagnetic substance and a stream of solution containing a reducing material for mixing into a reaction chamber such that the two solutions impinge upon one another causing an oxidation-reduction reaction between them to occur, and applying a magnetic field of 50 oe or more to the particles produced by the oxidation-reduction reaction for the period during which the particles become ferromagnetic particles after going through a superparamagnetic state and an apparatus for use in the practice of the above process comprising a reaction vessel, at least one nozzle for injecting each of a solution of a metal salt and a solution containing a reducing material into the reaction vessel and a magnet for producing a magnetic field in the reaction vessel with the nozzles being open to the magnetic field and positioned so that the solution of the metal salt and the solution of the reducing material when injected are mixed.
摘要翻译：一种制造铁磁粉末的方法，包括将能形成铁磁性物质的金属盐的水溶液流和含有还原材料的溶液流混合到反应室中，使得两种溶液彼此撞击导致在它们之间发生氧化还原反应，并且在通过超顺磁性状态的颗粒变成铁磁颗粒的时期之后，对由氧化还原反应产生的颗粒施加50ee或更大的磁场，用于上述方法的实践中，包括反应容器，用于将金属盐溶液和含有还原材料的溶液中的每一个注入反应容器的至少一个喷嘴和用于在反应容器中产生磁场的磁体其中喷嘴对磁场开放并且定位成使得金属盐a的溶液并且当注入时将还原材料的溶液混合。

6. 发明授权

US4713261A Method for preparing ferromagnetic iron oxide particles 失效
标题翻译：制备铁磁性氧化铁颗粒的方法
公开(公告)号：US4713261A
公开(公告)日：1987-12-15
申请号：US928352
申请日：1986-11-10
申请人： Kouichi Masaki , Tatsuji Kitamoto
发明人： Kouichi Masaki , Tatsuji Kitamoto
IPC分类号： C01G49/00 , G11B5/706 , H01F1/11 , B05D5/12
CPC分类号： G11B5/70657
摘要： A method for preparing ferromagnetic iron oxide particles is described, which comprises depositing a cobalt compound onto a surface of lepidocrostie (.gamma.-FeOOH) particles, and then calcining the particles at 150.degree. to 350.degree. C.
摘要翻译：描述了一种制备铁磁性氧化铁颗粒的方法，其包括将钴化合物沉积在沥青粉（γ-FeOOH）颗粒的表面上，然后在150℃至350℃下煅烧颗粒。

7. 发明授权

US4267207A Process for producing cobalt-containing ferromagnetic iron oxide powder 失效
标题翻译：含钴铁磁性氧化铁粉末的生产工艺
公开(公告)号：US4267207A
公开(公告)日：1981-05-12
申请号：US39028
申请日：1979-05-14
申请人： Koji Sasazawa , Tatsuji Kitamoto , Goro Akashi , Kouichi Masaki , Shinichiro Dezawa
发明人： Koji Sasazawa , Tatsuji Kitamoto , Goro Akashi , Kouichi Masaki , Shinichiro Dezawa
IPC分类号： C01G49/00 , C01G49/02 , G11B5/706 , H01F1/11 , B05D5/12
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。

8. 发明授权

US4678682A Process for producing magnetic recording medium 失效
标题翻译：磁记录介质的制造方法
公开(公告)号：US4678682A
公开(公告)日：1987-07-07
申请号：US496734
申请日：1983-05-20
申请人： Takamitsu Asai , Goro Akashi , Tatsuji Kitamoto , Hiroshi Chikamasa , Tsunehiko Sato
发明人： Takamitsu Asai , Goro Akashi , Tatsuji Kitamoto , Hiroshi Chikamasa , Tsunehiko Sato
IPC分类号： G11B5/845 , B05D3/14
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。

9. 发明授权

US4610903A Magneto-optical disk memory 失效
标题翻译：磁光盘存储器
公开(公告)号：US4610903A
公开(公告)日：1986-09-09
申请号：US687300
申请日：1984-12-28
申请人： Masaaki Nomura , Akira Nahara , Tatsuji Kitamoto
发明人： Masaaki Nomura , Akira Nahara , Tatsuji Kitamoto
IPC分类号： G11B11/10 , G11B11/105 , G11B7/24
CPC分类号： G11B11/10582 , Y10S428/90 , Y10T428/26 , Y10T428/268
摘要： A magneto-optical disk memory comprises a magneto-optical recording medium constituted by a flexible substrate, and a recording thin film overlaid on the substrate. The recording thin film is fabricated of an amorphous rare-earth transition metal alloy having the easy axis of magnetization normal to the film surface. The magneto-optical recording medium is sandwiched between two hard supporting disks.
摘要翻译：磁光盘存储器包括由柔性衬底构成的磁光记录介质和覆盖在衬底上的记录薄膜。该记录薄膜由易磁化轴垂直于膜表面的无定形稀土过渡金属合金制成。磁光记录介质夹在两个硬支撑盘之间。

10. 发明授权

US4608093A Ferromagnetic particles with stable magnetic characteristics and method of preparing same 失效
标题翻译：具有稳定磁特性的铁磁颗粒及其制备方法
公开(公告)号：US4608093A
公开(公告)日：1986-08-26
申请号：US771073
申请日：1985-08-30
申请人： Shizuo Umemura , Tatsuji Kitamoto
发明人： Shizuo Umemura , Tatsuji Kitamoto
IPC分类号： G11B5/706 , B22F1/02 , C09D5/23 , C09D7/12 , H01F1/06 , H01F1/09 , C23C8/14
CPC分类号： H01F1/061 , H01F1/09 , Y10S428/90 , Y10T428/2991
摘要： Cobalt-free ferromagnetic particles are disclosed. The particles are comprised of ferromagnetic metal inner cores and an outer oxidized layer. The particles have a saturation magnetization of 60 to 100 emu/g and a coercive force of 500 Oe or more. The outer layer provides a means for stabilizing the magnetic characteristics of the particles at temperatures not higher than 80.degree. C. in air. The particles are produced by gradually oxidizing ferromagnetic metal particles containing no cobalt in oxygen-containing gas such that the surface-oxidized metal particles have a saturation magnetization of 60 to 100 emu/g. The particles provided have good magnetic characteristics which are maintained with the passage of time even when the particles are subjected to adverse temperature and humidity conditions.
摘要翻译：公开了无钴铁磁颗粒。颗粒由铁磁性金属内芯和外部氧化层组成。颗粒的饱和磁化强度为60〜100emu / g，矫顽力为500Oe以上。外层提供了在空气中不高于80℃的温度下稳定颗粒的磁特性的方法。通过在含氧气体中逐渐氧化不含钴的铁磁性金属颗粒，使得表面氧化金属颗粒具有60至100emu / g的饱和磁化强度来制备颗粒。所提供的颗粒具有良好的磁特性，即使当颗粒经受不利的温度和湿度条件时，其也保持随时间的流逝。

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