公开(公告)号：US20090174969A1

公开(公告)日：2009-07-09

申请号：US12295460

申请日：2007-03-30

申请人： Toshio Tada ,  Takeshi Harasawa

发明人： Toshio Tada ,  Takeshi Harasawa

IPC分类号： G11B5/33

CPC分类号： G11B5/70 ,  G11B5/70678 ,  G11B5/714

摘要： The present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support, wherein the magnetic layer has a thickness δ ranging from 10 to 80 nm, a product, Mrδ, of a residual magnetization Mr of the magnetic layer and the thickness δ of the magnetic layer is equal to or greater than 1 mA but less than 5 mA, a ratio, Sdc/Sac, of an average area Sdc of magnetic clusters in a DC demagnetized state to an average area Sac of magnetic clusters in an AC demagnetized state as measured by a magnetic force microscope, MFM, ranges from 0.8 to 2.0.

摘要翻译： 磁记录介质技术领域本发明涉及一种磁记录介质，其包括在非磁性载体上包含铁磁性粉末和粘合剂的磁性层，其中所述磁性层的厚度为10至80nm，产物Mrdelta具有剩余磁化强度Mr 磁层的厚度δ等于或大于1mA但小于5mA，直流去磁状态的磁簇的平均面积Sdc与平均面积的比值Sdc / Sac 通过磁力显微镜MFM测量的AC退磁状态下的磁簇的Sac为0.8〜2.0。

公开(公告)号：US20110299198A1

公开(公告)日：2011-12-08

申请号：US13100510

申请日：2011-05-04

申请人： Toshio TADA ,  Takeshi Harasawa

发明人： Toshio TADA ,  Takeshi Harasawa

IPC分类号： B05D5/12 ,  G11B5/127

CPC分类号： G11B5/70 ,  G11B5/70678 ,  G11B5/714

摘要： The present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support, wherein the magnetic layer has a thickness δ ranging from 10 to 80 nm, a product, Mrδ, of a residual magnetization Mr of the magnetic layer and the thickness δ of the magnetic layer is equal to or greater than 1 mA but less than 5 mA, a ratio, Sdc/Sac, of an average area Sdc of magnetic clusters in a DC demagnetized state to an average area Sac of magnetic clusters in an AC demagnetized state as measured by a magnetic force microscope, MFM, ranges from 0.8 to 2.0.

摘要翻译： 本发明涉及一种磁记录介质，其包括在非磁性载体上包含铁磁性粉末和粘合剂的磁性层，其中所述磁性层具有10至80nm的厚度δ，剩余磁化强度Mr 的磁性层的厚度δ等于或大于1mA但小于5mA，直流去磁状态的磁簇的平均面积Sdc与平均面积的比值Sdc / Sac 通过磁力显微镜MFM测量的AC退磁状态下的磁簇的Sac为0.8〜2.0。

公开(公告)号：US08405497B2

公开(公告)日：2013-03-26

申请号：US12598154

申请日：2008-10-22

申请人： Kazunari Okabe ,  Akihiko Fujimoto ,  Takeshi Harasawa

发明人： Kazunari Okabe ,  Akihiko Fujimoto ,  Takeshi Harasawa

IPC分类号： B60W10/00

CPC分类号： F16D48/066 ,  F16D2500/1026 ,  F16D2500/1107 ,  F16D2500/3024 ,  F16D2500/30405 ,  F16D2500/30406 ,  F16D2500/50296 ,  F16D2500/7101 ,  Y10T477/6395 ,  Y10T477/6403

摘要： An alarm device for a clutch that issues an alarm indicating a lifetime expiration of the clutch that selectively connects and disconnects an input shaft to and from an output shaft, includes: a slip heat release threshold setting unit 104 that establishes a threshold criteria as to a clutch damage or the clutch lifetime, in a form of a relation between a heat release generated in a clutch slip operation and a frequency of the heat release occurrences; and a slip heat release calculator 105 that calculates the heat release during the clutch operation, based on a hydraulic oil pressure in an actual clutch operation and a relative circumferential speed between input and output shafts, the alarm device 11 issues the alarm based on the calculation result through the slip heat release calculating means 105 and the slip heat release threshold setting means 104.

摘要翻译： 一种用于发出表示选择性地将输入轴连接到输出轴并将其断开的离合器的终止期限的报警装置的报警装置包括：滑移热释放阈值设定单元104，其建立关于 离合器损坏或离合器寿命，以离合器打滑操作中产生的放热与放热发生的频率之间的关系的形式; 以及滑移散热计算器105，其基于实际离合器操作中的液压油和输入轴与输出轴之间的相对圆周速度来计算离合器操作期间的散热量，报警装置11基于计算发出报警 通过滑移热释放计算装置105和滑移热释放阈值设定装置104得到。

公开(公告)号：US06703106B2

公开(公告)日：2004-03-09

申请号：US10126616

申请日：2002-04-22

申请人： Hitoshi Noguchi ,  Takeshi Harasawa ,  Shinji Saito

发明人： Hitoshi Noguchi ,  Takeshi Harasawa ,  Shinji Saito

IPC分类号： G11B502

CPC分类号： G11B5/7085 ,  G11B5/00 ,  G11B5/70605 ,  G11B5/70678 ,  G11B2005/0016 ,  Y10T428/115 ,  Y10T428/25

摘要： A magnetic recording and reproducing method comprising recording and reproducing a signal with a magnetic head in a track width (A) of less than 5 &mgr;m on a magnetic recording medium comprising a support having provided thereon a magnetic layer containing at least a ferromagnetic powder, an abrasive and a binder, wherein the average longer size (B) of the abrasive particle(s) which are present on the magnetic layer surface is ⅓ or less of the track width (A).

摘要翻译： 一种磁记录和再现方法，包括在磁记录介质上记录和再现具有小于5μm的磁道宽度（A）的磁头的信号，所述磁记录介质包括其上设置有至少含有铁磁性粉末的磁性层的支撑体， 研磨剂和粘合剂，其中存在于磁性层表面上的磨料颗粒的平均较长尺寸（B）为轨道宽度（A）的1/3或更小。

公开(公告)号：US07264893B2

公开(公告)日：2007-09-04

申请号：US10835184

申请日：2004-04-30

申请人： Takeshi Harasawa ,  Hiroaki Takano

发明人： Takeshi Harasawa ,  Hiroaki Takano

IPC分类号： G11B5/66 ,  G11B5/70

CPC分类号： G11B5/714 ,  G11B5/70 ,  G11B5/70605 ,  G11B5/70678 ,  G11B5/842 ,  Y10T428/257

摘要： The invention provides a magnetic recording medium comprising a support having provided thereon a nonmagnetic layer containing a nonmagnetic powder, and a magnetic layer containing a ferromagnetic powder formed on the nonmagnetic layer after coating and drying thereof, wherein the ferromagnetic layer is a hexagonal ferrite powder having an average tabular diameter of 15 to 40 nm or a ferromagnetic metal powder having an average major axis length of 25 to 100 nm, the thickness of the magnetic layer is from 0.01 to 0.3 μm, the thickness of the nonmagnetic layer is from 0.5 to 5 μm, and the specific surface area and the total pore volume of the magnetic recording medium itself measured by a nitrogen absorption measured method are from 0.1 to 50 m2/g and from 0.001 to 1 ml/g, respectively, thereby being to provide the magnetic recording medium for high density recording remarkably improved in electromagnetic characteristics, particularly in high density recording characteristics.

摘要翻译： 本发明提供了一种磁记录介质，其包括在其上设置有包含非磁性粉末的非磁性层的载体和在其上涂覆和干燥之后含有在非磁性层上形成的铁磁性粉末的磁性层，其中所述铁磁性层是具有 平均片状直径为15〜40nm，平均长轴长度为25〜100nm的铁磁性金属粉末，磁性层的厚度为0.01〜0.3μm，非磁性层的厚度为0.5〜5 并且通过氮吸收测量方法测量的磁记录介质本身的比表面积和总孔体积为0.1至50m 2 / g和0.001至1ml / g， 从而提供用于高密度记录的磁记录介质，特别是在高密度记录特性方面，其电磁特性显着提高 cs。

公开(公告)号：US20070171573A1

公开(公告)日：2007-07-26

申请号：US11487473

申请日：2006-07-17

申请人： Masahito Oyanagi ,  Takeshi Harasawa

发明人： Masahito Oyanagi ,  Takeshi Harasawa

IPC分类号： G11B5/706

CPC分类号： G11B5/7085 ,  G11B5/70 ,  G11B5/714

摘要： Provided is a magnetic recording medium affording both reduced head abrasion and good durability in high-density magnetic recording and reproduction systems employing MR heads as reproduction heads. The magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder, a binder and an abrasive in this order on a nonmagnetic support. The abrasive comprises carbide having a mean particle diameter ranging from 0.02 to 0.10 micrometer.

摘要翻译： 提供一种磁记录介质，其在采用MR磁头作为再现磁头的高密度磁记录和再现系统中既减少磁头磨损，又具有良好的耐久性。 该磁记录介质包括非磁性层，其包含非磁性粉末和粘合剂，以及磁性层，其包含铁磁性粉末，粘合剂和研磨剂，其顺序为非磁性载体。 研磨剂包括平均粒径为0.02至0.10微米的碳化物。

公开(公告)号：US20060187589A1

公开(公告)日：2006-08-24

申请号：US11358123

申请日：2006-02-22

申请人： Takeshi Harasawa ,  Naoto Abe ,  Takeshi Nagata

发明人： Takeshi Harasawa ,  Naoto Abe ,  Takeshi Nagata

IPC分类号： G11B5/33

CPC分类号： G11B5/70 ,  G11B5/842

摘要： Provided is a magnetic recording medium capable of achieving high reproduction output in a short wavelength region. The magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support. The magnetic layer has a squareness ranging from 0.6 to 1.0 in a perpendicular direction, and the magnetic recording medium is employed for recording a magnetic signal on the medium in a longitudinal direction at a linear recording density of equal to or greater than 300 Kbpi using a recording head with a gap length of equal to or less than 0.3 micrometer, and reproducing the magnetic signal using a magnetoresistive head with a shield spacing of equal to or less than 0.2 micrometer.

摘要翻译： 提供了能够在短波长区域中实现高再现输出的磁记录介质。 该磁记录介质包括非磁性层，其包含非磁性粉末和粘合剂，以及磁性层，其包含铁磁粉末和粘合剂，其顺序为非磁性载体。 磁性层在垂直方向上具有0.6至1.0的正方形，并且磁记录介质用于以等于或大于300Kbpi的线性记录密度在纵向方向上在介质上记录磁信号，使用 记录头的间隙长度等于或小于0.3微米，并且使用屏蔽间距等于或小于0.2微米的磁阻头再现磁信号。

公开(公告)号：US06682800B2

公开(公告)日：2004-01-27

申请号：US09789632

申请日：2001-02-22

申请人： Hiroshi Hashimoto ,  Masahiko Mori ,  Takeshi Harasawa

发明人： Hiroshi Hashimoto ,  Masahiko Mori ,  Takeshi Harasawa

IPC分类号： G11B5725

CPC分类号： G11B5/738 ,  Y10T428/265

摘要： The present invention provides a magnetic recording medium, which comprises a primer layer containing at least a nonmagnetic lower layer on a support and at least one layer of magnetic layer with ferromagnetic powder dispersed in a binder, said magnetic layer being provided on said primer layer, whereby at least one type of compounds selected from the following general formulae (1) and (2) is contained at least in the primer layer: where R1 is an alkyl group with 1 to 2 carbon atoms; and R2, R3, and R4 each represents a hydrocarbon group having 4 to 21 carbon atoms.

摘要翻译： 本发明提供了一种磁记录介质，其包括在载体上至少含有非磁性下层的底漆层和分散在粘合剂中的铁磁性粉末的至少一层磁性层，所述磁性层设置在所述底漆层上， 其中至少一种选自以下通式（1）和（2）的化合物至少在底漆层中含有：其中R 1是具有1至2个碳原子的烷基; R 2，R 3，R 4各自表示碳原子数为4〜21的烃基。

公开(公告)号：US06541132B2

公开(公告)日：2003-04-01

申请号：US09892858

申请日：2001-06-28

申请人： Hitoshi Noguchi ,  Shinji Saito ,  Takeshi Harasawa

发明人： Hitoshi Noguchi ,  Shinji Saito ,  Takeshi Harasawa

IPC分类号： G11B5012

CPC分类号： G11B5/70678 ,  G11B5/70 ,  G11B5/70621

摘要： A high-capacity magnetic disk comprises a support, a non-magnetic layer and a magnetic layer having a thickness less than 0.15 &mgr;m and containing ferromagnetic powder selected from fine particles of ferromagnetic metal or fine particles of ferromagnetic hexagonal ferrite dispersed in a binder, and the magnetic disk has a track width less than 5 &mgr;m and can record signals having a bit length less than 0.5 &mgr;m, wherein the ratio of the track width to the average major axis length or tabular diameter of ferromagnetic particles is from 50 to 100, the ratio of the shortest bit length to the average major axis length or tabular diameter of ferromagnetic particles is from 3 to 20, and the thickness of magnetic layer has a variation coefficient of 0.5 or below, expressed in terms of a ratio of the standard deviation to the average thickness of the magnetic layer.

摘要翻译： 高容量磁盘包括支撑体，非磁性层和厚度小于0.15μm的磁性层，并且含有选自铁磁性金属的细颗粒或分散在粘合剂中的铁磁性六角铁氧体的微粒的铁磁性粉末，以及 磁盘具有小于5um的轨道宽度，并且可以记录位长度小于0.5μm的信号，其中轨道宽度与铁磁颗粒的平均长轴长度或平板状直径的比率为50至100， 铁磁颗粒的最短位长与平均长轴长度或平板状直径之比为3〜20，磁性层的厚度变化系数为0.5以下，以标准偏差与 磁性层的平均厚度。

公开(公告)号：US08681451B2

公开(公告)日：2014-03-25

申请号：US13427635

申请日：2012-03-22

申请人： Takeshi Harasawa ,  Masahiko Mori

发明人： Takeshi Harasawa ,  Masahiko Mori

IPC分类号： G11B5/706

CPC分类号： G11B5/70 ,  G11B5/7013 ,  G11B5/70678

摘要： An aspect of the present invention relates to a magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binder on a nonmagnetic support, wherein the ferromagnetic powder is a hexagonal ferrite powder, squareness in a vertical direction without demagnetizing field correction of the magnetic layer ranges from 0.6 to 1.0, and the magnetic layer further comprises a compound in which a substituent selected from the group consisting of a carboxyl group and a hydroxyl group is directly substituted into a ring structure comprising a double bond and having a ClogP falling within a range of 2.3 to 5.5.

摘要翻译： 本发明的一个方面涉及一种磁带，其包括在非磁性载体上含有铁磁粉末和粘合剂的磁性层，其中所述铁磁性粉末是六方晶系铁氧体粉末，在垂直方向上具有矩形矩而不对磁性层进行磁场校正 范围为0.6〜1.0，磁性层还含有选自羧基和羟基的取代基被直接取代成包含双键并且具有ClogP的环结构的化合物 为2.3〜5.5。