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公开(公告)号：US20070042230A1
公开(公告)日：2007-02-22
申请号：US11494550
申请日：2006-07-28
申请人： Kenji Masada , Yuzo Ishikawa , Hiroshi Kimura
发明人： Kenji Masada , Yuzo Ishikawa , Hiroshi Kimura
CPC分类号： H01F1/065 , G11B5/70615 , G11B5/70626 , G11B5/714
摘要： An iron system magnetic powder, and particularly an iron system magnetic powder comprised chiefly of Fe16N2, is provided that has an atomic ratio of total noble metal content to Fe of 0.01-10%. The magnetic powder can be produced by subjecting iron oxy-hydroxide or iron oxide having an atomic ratio of total noble metal content to Fe of 0.01-10% to reduction treatment. The average particle volume of the magnetic powder is preferably 4,000 nm3 or less. The magnetic powder is suitable for fabricating high recording density media of low noise, high output and high C/N ratio that are suitable for use with a GMR head or the like.
摘要翻译： 提供了一种铁系磁粉，特别是主要由Fe 16 N 2 N 2构成的铁系磁性粉末，其具有总贵金属含量与Fe的原子比 0.01-10％。 磁性粉末可以通过使具有0.01-10％的总贵金属含量的原子比的氧化铁或氧化铁进行还原处理来制造。 磁粉的平均粒子体积优选为4000nm以下3以下。 该磁性粉末适用于制造适用于GMR头等的低噪声，高输出和高C / N比的高记录密度介质。
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公开(公告)号：US08110048B2
公开(公告)日：2012-02-07
申请号：US12986198
申请日：2011-01-07
申请人： Kenji Masada , Yuzo Ishikawa , Hiroshi Kimura
发明人： Kenji Masada , Yuzo Ishikawa , Hiroshi Kimura
CPC分类号： H01F1/065 , G11B5/70615 , G11B5/70626 , G11B5/714
摘要： A method for producing a magnetic powder comprised chiefly of Fe16N2 comprising providing a starting powder comprising an oxy-hydroxide or oxide of iron and an amount of noble metal. The starting powder is reduced into an iron powder by a dry method using a hydrogen gas; and the iron powder is nitrided into a magnetic powder comprised chiefly of Fe16N2 particles using a nitrogen-containing gas at a temperature not higher than 200° C. The amount of noble metal is such that an amount that the atomic percent ratio of the noble metal content to Fe in the magnetic powder is 0.01-10.
摘要翻译： 一种主要由Fe16N2构成的磁性粉末的制造方法，其特征在于，提供包含氧化氢，氧化铁和一定数量的贵金属的起始粉末。 起始粉末通过使用氢气的干法还原成铁粉末; 并使用含氮气体在不高于200℃的温度将铁粉浸入主要由Fe16N2颗粒构成的磁性粉末中。贵金属的量使得贵金属的原子百分比比 磁粉中Fe含量为0.01-10。
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3.发明申请Iron system magnetic powder having high coercive force, and magnetic recording medium using same 审中-公开具有高矫顽力的铁系磁铁粉末和使用其的磁记录介质公开(公告)号：US20070111039A1
公开(公告)日：2007-05-17
申请号：US11594790
申请日：2006-11-09
申请人： Yuzo Ishikawa , Kenji Masada
发明人： Yuzo Ishikawa , Kenji Masada
CPC分类号： G11B5/70615 , B22F1/0018 , B22F2998/00 , B22F2998/10 , B82Y30/00 , C01B21/0602 , C01B21/0622 , C01P2002/72 , C01P2002/74 , C01P2004/64 , C01P2006/42 , C22C33/0257 , G11B5/70626 , H01F1/065 , H01F1/09 , B22F9/22 , B22F2201/013 , B22F2201/016 , B22F9/24 , B22F2201/02
摘要： A magnetic powder is provided composed of particles that, even when the particle size is refined, exhibits excellent magnetic properties, in particular, a high coercive force, for use in a high-density recording medium. The invention also provides a magnetic recording medium using the powder. The powder is an iron system magnetic powder containing, as an atomic ratio of Fe, a total of 0.01 to 10 at. % of one or more selected from W and Mo, particularly a magnetic powder comprised mainly of Fe16N2. The magnetic powder is able to exhibit a high coercive force of 238 kA/m (3000 Oe) or more. In addition to the W and Mo, the magnetic powder may contain, as an atomic ratio of Fe, a total of up to 25 at. % of one or more selected from Al and a rare earth element (defined as including Y).
摘要翻译： 提供由颗粒构成的磁性粉末，即使当粒径精细化时，在高密度记录介质中显示出优异的磁性能，特别是高矫顽力。 本发明还提供了使用该粉末的磁记录介质。 该粉末是铁系磁粉，以Fe的原子比计，总计为0.01〜10at。 选自W和Mo中的一种或多种的％，特别是主要由Fe <！ - SIPO
- > N 2 N 2组成的磁性粉末。 磁性粉末能够表现出238kA / m（3000Oe）以上的高矫顽力。 除了W和Mo之外，磁粉可以以Fe的原子比含有总计高达25at。 选自Al和稀土元素（定义为包括Y）中的一种或多种的％。 -
公开(公告)号：US4897570A
公开(公告)日：1990-01-30
申请号：US154693
申请日：1988-02-11
申请人： Yuzo Ishikawa , Masahiko Tahara , Yuji Hirabayashi
发明人： Yuzo Ishikawa , Masahiko Tahara , Yuji Hirabayashi
摘要： Elements which exhibit good thermal conductivity are disposed in contact with permanent magnets of an electric motor. These elements absorb heat from the magnets and reduce the rate at which the temperature of the magnets increases. The elements can be provided with fins and the like to increase the rate at which heat is released from the elements.
摘要翻译： 表现出良好导热性的元件设置成与电动机的永久磁铁接触。 这些元件从磁体吸收热量并降低磁体的温度升高的速度。 元件可以设置有翅片等，以增加从元件释放热量的速度。
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5.发明申请Iron Nitride-Based Magnetic Powder, Process for Producing the Same, and Magnetic Recording Medium 审中-公开基于硝酸铁的磁粉，其制造方法和磁记录介质公开(公告)号：US20090252991A1
公开(公告)日：2009-10-08
申请号：US12308112
申请日：2007-06-08
申请人： Yuzo Ishikawa , Kenji Masada
发明人： Yuzo Ishikawa , Kenji Masada
CPC分类号： G11B5/70626 , B82Y30/00 , C01B21/0622 , C01P2004/64 , C01P2004/80 , C01P2006/42 , G11B5/712 , G11B5/714 , H01F1/065 , H01F1/09
摘要： Provided is an iron nitride-based magnetic powder that comprises magnetic particles having a mean particle size of at most 20 nm. The magnetic particle has a core of a main phase of Fe16N2 and has, on the outer side of the core, an oxide phase derived from a metal Fe phase formed by reduction of iron nitride. In relation to the weatherability index Δσs and the saturation magnetization as thereof, the magnetic powder satisfies Δσs≦0.8×σs−30. In this, Δσs=(σs−σs1)/σs×100. σs1 means the saturation magnetization of the magnetic powder kept in an atmosphere of 60° C. and 90% RH for 1 week. The powder can be obtained by exposing powder particles having a main phase of Fe16N2 to a reducing gas to partly reduce the region of the surface of the particles into a metal Fe phase (gradual reduction) followed by exposing them to an oxidizing gas to oxidize a part of the surface of the metal Fe phase into an oxide phase (gradual oxidation).
摘要翻译： 提供一种含有平均粒径为20nm以下的磁性粒子的氮化铁系磁性粉末。 磁性颗粒具有Fe16N2的主相的芯，并且在芯的外侧具有衍生自通过还原氮化铁形成的金属Fe相的氧化物相。 关于耐候性指数Deltasigmas和饱和磁化强度，磁粉满足Deltasigmas <= 0.8xsigmas-30。 在这里，Deltasigmas =（sigmas-sigmas1）/ sigmasx100。 sigmas1表示磁粉的饱和磁化强度保持在60℃和90％RH的气氛中1周。 可以通过将具有Fe16N2主相的粉末颗粒暴露于还原气体来部分地将颗粒表面的区域还原为金属Fe相（逐渐还原），然后将其暴露于氧化气体以氧化 部分表面的金属Fe相变成氧化相（逐渐氧化）。
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公开(公告)号：US20110123426A1
公开(公告)日：2011-05-26
申请号：US12986198
申请日：2011-01-07
申请人： Kenji MASADA , Yuzo ISHIKAWA , Hiroshi KIMURA
发明人： Kenji MASADA , Yuzo ISHIKAWA , Hiroshi KIMURA
CPC分类号： H01F1/065 , G11B5/70615 , G11B5/70626 , G11B5/714
摘要： An iron system magnetic powder, and particularly an iron system magnetic powder comprised chiefly of Fe16N2, is provided that has an atomic ratio of total noble metal content to Fe of 0.01-10%. The magnetic powder can be produced by subjecting iron oxy-hydroxide or iron oxide having an atomic ratio of total noble metal content to Fe of 0.01-10% to reduction treatment. The average particle volume of the magnetic powder is preferably 4,000 nm3 or less. The magnetic powder is suitable for fabricating high recording density media of low noise, high output and high C/N ratio that are suitable for use with a GMR head or the like.
摘要翻译： 提供铁系磁铁粉末，特别是主要由Fe16N2构成的铁系磁铁粉末，其具有0.01-10％的总贵金属含量与Fe的原子比。 磁性粉末可以通过使具有0.01-10％的总贵金属含量的原子比的氧化铁或氧化铁进行还原处理来制造。 磁粉的平均粒子体积优选为4000nm 3以下。 该磁性粉末适用于制造适用于GMR头等的低噪声，高输出和高C / N比的高记录密度介质。
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公开(公告)号：US5220166A
公开(公告)日：1993-06-15
申请号：US756552
申请日：1991-09-09
IPC分类号： G06K7/12
CPC分类号： G06K7/12
摘要： An information reading method includes the steps of irradiating a phosphor activated by neodymium and ytterbium ions with exciting light of a wavelength between 500 nm and 780 nm that can excite the neodymium ions, and reading the information by receiving the light emitted from the phosphor with a photodetector designed to detect light with wavelengths between 840 m and 1100 nm. Consequently, the information recorded using the phosphor activated by neodymium and ytterbium ions can be read with a high performance without using a filter for cutting the exciting light.
摘要翻译： 信息读取方法包括以下步骤：用能够激发钕离子的波长为500nm至780nm的激发光照射由钕和镱离子激活的荧光体，并且通过接收从荧光体发射的光来读取信息 光电检测器设计用于检测波长在840米和1100纳米之间的光。 因此，使用由钕和镱离子激活的荧光体记录的信息可以以高性能读取，而不使用用于切割激发光的滤光器。
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公开(公告)号：US5117467A
公开(公告)日：1992-05-26
申请号：US714368
申请日：1991-06-12
申请人： Hideo Misaki , Shigeru Ueda , Kazuhiro Watanabe , Yuzo Ishikawa , Hirao Nagae , Takashi Matsuzawa
发明人： Hideo Misaki , Shigeru Ueda , Kazuhiro Watanabe , Yuzo Ishikawa , Hirao Nagae , Takashi Matsuzawa
摘要： A colony counting apparatus includes a reading unit with a visual sensor incorporated therein. The presence of a colony is detected at the end of that colony by moving the reading unit along lines selected at an appropriate pitch and by reading data on the individual points set along each line as logical high or low signals. The values obtained in the above-described counting operation are added and stored in an addition/storage device in a CPU, and the results of addition which are stored in the addition/storage device are output to a suitable display by an outputting device when the counting operation is completed.
摘要翻译： 集落计数装置包括其中包含视觉传感器的读取单元。 通过沿着以适当间距选择的线移动读取单元，并通过读取沿着每行设置的各个点的数据作为逻辑高或低信号，在该殖民地结束时检测到菌落的存在。 将上述计数操作中获得的值相加并存储在CPU中的加法/存储装置中，并且存储在加法/存储装置中的相加结果通过输出装置输出到合适的显示器 计数操作完成。
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