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1. 发明授权

US5069933A Method for making magnetic recording media 失效
公开(公告)号：US5069933A
公开(公告)日：1991-12-03
申请号：US634663
申请日：1990-12-27
申请人： Tadashi Yasunaga , Shiro Kaneko , Kunihiko Sano
发明人： Tadashi Yasunaga , Shiro Kaneko , Kunihiko Sano
IPC分类号： G11B5/85 , G11B5/64 , G11B5/84
CPC分类号： G11B5/656 , G11B5/84
摘要： A method for making a magnetic recording medium comprises the steps of forming a thin ferromagnetic metal film on a non-magnetic substrate. The thin ferromagnetic metal film contains Co as a main constituent and contains oxygen in a proportion of at least 15 at %. Thereafter, the thin ferromagnetic metal film is exposed to an ozone-containing atmosphere. A magnetic recording medium is thereby obtained, which exhibits excellent resistance to corrosion with salts and good electromagnetic transducing characteristics.

2. 发明授权

US5503943A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5503943A
公开(公告)日：1996-04-02
申请号：US285781
申请日：1994-08-04
申请人： Kunihiko Sano , Tadashi Yasunaga , Hiroaki Doushita
发明人： Kunihiko Sano , Tadashi Yasunaga , Hiroaki Doushita
IPC分类号： G11B5/64 , C23C14/14 , G11B5/62 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/85 , H01F10/16
CPC分类号： G11B5/656 , G11B5/85 , Y10S428/90
摘要： A metal thin film magnetic recording medium having improved S/N and reduced noise is disclosed, which has a ferromagnetic metal thin film composed mainly of Co on a non-magnetic support, characterized in that the crystallite size as determined from the thin film X-ray diffraction method is 45 .ANG. (angstrom) or less relative to the (100) face of .alpha.-Co, and 120 .ANG. or less relative to the (002) face of .alpha.-Co.
摘要翻译：公开了一种具有改善的S / N和降低的噪声的金属薄膜磁记录介质，其具有在非磁性载体上主要由Co组成的强磁性金属薄膜，其特征在于，从薄膜X- X射线衍射法相对于α-Co的（100）面为45（埃）或更小，相对于α-Co的（002）面为120或更小。

3. 发明授权

US5123376A Apparatus for manufacturing magnetic recording medium 失效
标题翻译：制造磁记录介质的装置
公开(公告)号：US5123376A
公开(公告)日：1992-06-23
申请号：US641399
申请日：1991-01-15
申请人： Shiro Kaneko , Masao Takei , Tadashi Yasunaga
发明人： Shiro Kaneko , Masao Takei , Tadashi Yasunaga
IPC分类号： G11B5/84
CPC分类号： G11B5/8408
摘要： An apparatus for manufacturing a magnetic recording medium, including a device for oxidizing the surface of a thin magnetic film formed on a flexible carrier. A hermetic chamber is provided including a roll loading chamber for accommodating a supply roll of the carrier on which the thin magnetic film has been deposited in advance, a processing chamber, and a roll takeout chamber for accommodating a take-up roll of the carrier. A rotatable heating roll is disposed in the processing chamber. The carrier is guided from the supply roll accommodated in the roll loading chamber into the processing chamber and through a predetermined angle along the surface of the heating roll and then to the take-up roll accommodated in the takeout chamber. A baffle plate is provided near a peripheral surface of a portion of the heating roll on which the carrier is wound, and a plurality of nozzle units are provided in the plate for blowing gaseous oxygen or ozone toward the magnetic film.

4. 发明申请

US20080316649A1 METHOD FOR PRODUCING MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING MEDIUM PRODUCED BY THE PRODUCTION METHOD, AND MOLD STRUCTURE FOR USE IN THE PRODUCTION METHOD 审中-公开
标题翻译：用于生产磁记录介质的方法，由生产方法生产的磁记录介质和用于生产方法的模具结构
公开(公告)号：US20080316649A1
公开(公告)日：2008-12-25
申请号：US12142611
申请日：2008-06-19
申请人： Masakazu NISHIKAWA , Tadashi Yasunaga , Yoichi Nishida
发明人： Masakazu NISHIKAWA , Tadashi Yasunaga , Yoichi Nishida
IPC分类号： G11B5/74 , B05D5/12
CPC分类号： G11B5/855 , B82Y10/00 , G11B5/743 , G11B5/865
摘要： The present invention provides a method for producing a magnetic recording medium having servo areas and data areas using a mold structure having a plurality of convex portions, the method, including: forming an imprint resist layer on a surface of a substrate for the magnetic recording medium, forming a convexo-concave resist pattern in the formed imprint resist layer by pressing the plurality of convex portions of the mold structure against the imprint resist layer, and transferring magnetism to the servo areas in the magnetic recording medium by applying a magnetic field to the servo areas via the mold structure.
摘要翻译：本发明提供一种使用具有多个凸部的模具结构来制造具有伺服区域和数据区域的磁记录介质的方法，所述方法包括：在用于磁记录介质的基板的表面上形成压印抗蚀剂层通过将模具结构的多个凸部按压在抗蚀剂层上，在形成的抗压印层中形成凹凸的抗蚀剂图案，并通过对磁记录介质施加磁场将磁力传递到磁记录介质的伺服区域伺服区通过模具结构。

5. 发明授权

US07149042B2 Master carrier for magnetic transfer 失效
公开(公告)号：US07149042B2
公开(公告)日：2006-12-12
申请号：US11014944
申请日：2004-12-20
申请人： Masakazu Nishikawa , Tadashi Yasunaga , Kazuhiro Niitsuma
发明人： Masakazu Nishikawa , Tadashi Yasunaga , Kazuhiro Niitsuma
IPC分类号： G11B5/86
CPC分类号： B82Y10/00 , G11B5/59633 , G11B5/743 , G11B5/82 , G11B5/865
摘要： A master carrier for magnetic transfer is equipped with a substrate having a land/groove pattern. The land/groove pattern is formed from a magnetic material and corresponds to information that is transferred to a magnetic recording disk. Each land in the land/groove pattern has four round corners whose radius is from 1% through 47% of the width of a data track on the disk.

6. 发明授权

US07054082B2 Magnetic transfer method for a high-density magnetic recording medium 失效
公开(公告)号：US07054082B2
公开(公告)日：2006-05-30
申请号：US10163370
申请日：2002-06-07
申请人： Masakazu Nishikawa , Tadashi Yasunaga
发明人： Masakazu Nishikawa , Tadashi Yasunaga
IPC分类号： G11B5/86
CPC分类号： G11B5/865 , G11B5/59633 , G11B5/82
摘要： An accurate magnetic transfer to a high-density slave medium having two magnetic layers and utilizing antiferromagnetic coupling is performed. By applying a first magnetic field that causes both the first and second magnetic layers of the magnetic layer of a slave medium to reach saturation magnetization unidirectionally along the circumferential direction of the track, the first and second magnetic layers are magnetized uniformly in the same direction as the first magnetic field. Then, a second magnetic field that inverts the magnetization of the first magnetic layer and has no effect on the magnetization of the second magnetic layer is applied in the opposite direction, whereby only the magnetization direction of the first magnetic layer is inverted in the direction of the second magnetic field. Thereby, a favorable initial magnetization state in which the magnetization directions of the first and second magnetic layers are oriented antiparallel can be obtained.

7. 发明授权

US5560995A Magnetic recording medium having a ferromagnetic metal thin film upon which is coated a phosphorous and fluorine containing composition 失效
标题翻译：具有铁磁金属薄膜的磁记录介质涂覆有含磷和氟的组合物
公开(公告)号：US5560995A
公开(公告)日：1996-10-01
申请号：US442755
申请日：1995-05-17
申请人： Kazuyuki Usuki , Toshio Ishida , Tadashi Yasunaga
发明人： Kazuyuki Usuki , Toshio Ishida , Tadashi Yasunaga
IPC分类号： G11B5/66 , G11B5/71 , G11B5/725 , G11B5/72
CPC分类号： G11B5/725 , Y10S428/90 , Y10T428/31678
摘要： The magnetic recording medium has a magnetic layer of a ferromagnetic metal thin film over at least one surface of a non-magnetic base, in which a phosphoric monoester compound which is represented by R.sub.1 --OPO(OH).sub.2, a florine-containing fatty acid ester compound which is represented by R.sub.2 --COO--R.sub.3, and a fluorinated hydrocarbon in which some of the hydrogen atoms of a hydrocarbon having from 14 to 40 carbon atoms have been replaced by fluorine atoms, are present on the magnetic layer. R.sub.1 is a hydrocarbon group having from 8 to 26 carbon atoms. R.sub.2 and R.sub.3 are each a hydrocarbon group having from 8 to 26 carbon atoms, or a fluorinated hydrocarbon group in which some or all of the hydrogen atoms of a hydrocarbon group having from 8 to 26 carbon atoms have been replaced by fluorine atoms. R.sub.2 and R.sub.3 may be the same or different from each other. At least either one of R.sub.2 and R.sub.3 contains fluorine atoms.
摘要翻译：磁记录介质在非磁性碱的至少一个表面上具有强磁性金属薄膜的磁性层，其中由R1-OPO（OH）2表示的磷酸单酯化合物，含有佛罗里酸的脂肪酸由R2-COO-R3表示的酯化合物和其中一些具有14〜40个碳原子的烃的氢原子被氟原子代替的氟化烃存在于磁性层上。 R1是具有8至26个碳原子的烃基。 R2和R3各自为具有8至26个碳原子的烃基或其中具有8至26个碳原子的烃基的一些或全部氢原子已被氟原子替代的氟化烃基。 R2和R3可以相同或不同。 R2和R3中的至少一个含有氟原子。

8. 发明授权

US4876113A Method for producing magnetic recording media 失效
标题翻译：磁记录介质的制造方法
公开(公告)号：US4876113A
公开(公告)日：1989-10-24
申请号：US192981
申请日：1988-05-12
申请人： Tadashi Yasunaga , Koji Sasazawa
发明人： Tadashi Yasunaga , Koji Sasazawa
IPC分类号： G11B5/66 , C10M105/34 , C10N40/18 , C10N70/00 , G11B5/64 , G11B5/72 , G11B5/725 , G11B5/84
CPC分类号： G11B5/8408 , G11B5/84 , Y10S428/90
摘要： A method for producing a magnetic recording medium having improved corrosion resistance and durability. A magnetic metal thin film is formed on a nonmagnetic substrate. The substrate then is exposed to a glow discharge atmosphere, and immediately thereafter a protective lubricant layer is deposited over the magnetic metal thin film.
摘要翻译：一种具有改善的耐腐蚀性和耐久性的磁记录介质的制造方法。在非磁性基板上形成磁性金属薄膜。然后将衬底暴露于辉光放电气氛，并且立即在该磁性金属薄膜上沉积保护性润滑剂层。

9. 发明授权

US4835068A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4835068A
公开(公告)日：1989-05-30
申请号：US113380
申请日：1987-10-27
申请人： Yoshihiro Arai , Tadashi Yasunaga , Ryuji Shirahata
发明人： Yoshihiro Arai , Tadashi Yasunaga , Ryuji Shirahata
IPC分类号： G11B5/66 , C08L67/02 , G11B5/64 , G11B5/706 , G11B5/73 , G11B5/851
CPC分类号： G11B5/65 , G11B5/851 , Y10S428/90
摘要： A magnetic recording medium comprises a non-magnetic substrate and a magnetic film which is formed on the non-magnetic substrate and the major component of which is iron nitride-oxide.
摘要翻译：磁记录介质包括非磁性基板和形成在非磁性基板上的磁性膜，其主要成分是氧化铁 - 氧化物。

10. 发明授权

US4713262A Manufacturing method for a magnetic recording medium 失效
标题翻译：磁记录介质的制造方法
公开(公告)号：US4713262A
公开(公告)日：1987-12-15
申请号：US914513
申请日：1986-10-02
申请人： Tadashi Yasunaga , Ryuji Shirahata
发明人： Tadashi Yasunaga , Ryuji Shirahata
IPC分类号： G11B5/85 , H01F10/02
CPC分类号： G11B5/85
摘要： A method for manufacturing a magnetic recording medium, comprising evaporating a magnetic metal material from an evaporation source to form a vapor stream of the magnetic metal material, vapor-depositing the magnetic metal material on a tape-shaped substrate moving along a cooling can such that the incident angle (.theta.) of the vapor stream which is incident upon the substrate changes continuously from a high incident angle (.theta.max) to a low incident angle (.theta.min), and at the same time introducing one or more gases selected from the group consisting of a rare gas, CO.sub.2 gas, N.sub.2 gas, and nitrogen oxide gas, or a mixed gas composed of oxygen gas and one or more gases selected from the group consisting of a rare gas, CO.sub.2 gas, N.sub.2 gas and nitrogen oxide gas from a gas inlet part disposed at a position in the vicinity of the substrate and near the vapor stream at a low incident angle (.theta.min) upon the substrate, thereby providing a ferromagnetic metal film on the substrate.
摘要翻译：一种制造磁记录介质的方法，包括从蒸发源蒸发磁性金属材料以形成磁性金属材料的蒸汽流，将磁性金属材料气化沉积在沿冷却罐移动的带状基底上，使得入射到衬底上的蒸气流的入射角（θ）从高入射角（θmax）连续变化到低入射角（θmin），并且同时引入一个或多个选自或者由稀有气体，二氧化碳气体，氮气和氮氧化物气体组成的组，或由氧气和选自稀有气体，二氧化碳气体，氮气和氮氧化物气体中的一种或多种气体构成的混合气体从设置在基板附近的位置处的气体入口部分以及在基板上的低入射角（θmin）附近的蒸气流，从而在基板上提供强磁性金属膜。

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