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。

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：US06999255B2

公开(公告)日：2006-02-14

申请号：US10290193

申请日：2002-11-08

申请人： Kiyomi Ejiri ,  Takeshi Harasawa

发明人： Kiyomi Ejiri ,  Takeshi Harasawa

IPC分类号： G11B5/02

CPC分类号： G11B5/00 ,  G11B5/00813 ,  G11B5/02 ,  G11B5/133 ,  G11B5/1878 ,  G11B5/39

摘要： A magnetic recording and reproducing system, including recording a signal on a magnetic recording medium by an inductive head and reproducing the signal by a magneto resistance head. The gap length of the inductive head is 0.3 μm or less. The maximum particle diameter of ferromagnetic powder is from 1/10 to ½ of the gap length, the minimum particle diameter of the powder is from 1/100 to ⅕ of the gap length, and the thickness of a magnetic layer is from 1/10 to ½ of the gap length. The average particle size of the powder is from 10 to 35 nm, the tabular ratio is from 2 to 6, the squareness ratio of in-plane of the magnetic layer is from 0.5 to 0.9 in the longitudinal direction, and from 0.2 to 0.6 in the thickness direction, and the thickness of the magnetic layer is from 0.01 to 0.2 μm.

摘要翻译： 一种磁记录和再现系统，包括通过感应头在磁记录介质上记录信号，并通过磁阻头再现信号。 感应头的间隙长度为0.3μm以下。 铁磁粉末的最大粒径为间隙长度的1/10至1/2，粉末的最小粒径为间隙长度的1/100至1/5，磁性层的厚度为1 / 10到1/2的间隙长度。 粉末的平均粒径为10〜35nm，片状比为2〜6，磁性层的面内的矩形比在纵向为0.5〜0.9，在0.2〜0.6的范围内 厚度方向和磁性层的厚度为0.01〜0.2μm。

公开(公告)号：US06749917B2

公开(公告)日：2004-06-15

申请号：US09855078

申请日：2001-05-14

申请人： Hiroshi Hashimoto ,  Takeshi Harasawa

发明人： Hiroshi Hashimoto ,  Takeshi Harasawa

IPC分类号： G11B5738

CPC分类号： G11B5/733 ,  G11B5/738 ,  Y10T428/265

摘要： The present invention provides a magnetic recording medium of high density with high durability and good electromagnetic transfer characteristics. The present invention provides a magnetic recording medium, which comprises a primer layer containing at least nonmagnetic powder on a support member and at least one layer of magnetic layer containing ferromagnetic powder dispersed in a binder, the magnetic layer being placed on the support member, wherein the primer layer comprises at least one type of compound expressed by the following general formula (1); General formula (1)  where R1, R2, R3, and R4 each represents an alkyl group having 2 to 7 carbon atoms.

摘要翻译： 本发明提供一种高密度，高耐久性和良好的电磁传递特性的磁记录介质。 本发明提供一种磁记录介质，其包括在支撑构件上至少含有非磁性粉末的底漆层和至少一层包含分散在粘合剂中的铁磁性粉末的磁性层，所述磁性层被放置在所述支撑构件上，其中 底漆层包含至少一种由以下通式（1）表示的化合物：通式（1）其中R 1，R 2，R 3和R 4各自表示烷基 具有2至7个碳原子的基团。

公开(公告)号：US06713149B2

公开(公告)日：2004-03-30

申请号：US10194245

申请日：2002-07-15

申请人： Takeshi Harasawa ,  Hitoshi Noguchi ,  Shinji Saito

发明人： Takeshi Harasawa ,  Hitoshi Noguchi ,  Shinji Saito

IPC分类号： G11B5706

CPC分类号： G11B5/70 ,  G11B5/70678 ,  G11B5/714 ,  Y10T428/12951 ,  Y10T428/12993 ,  Y10T428/249953 ,  Y10T428/249979 ,  Y10T428/257 ,  Y10T428/265

摘要： A magnetic recording medium is disclosed, comprising a support having provided thereon a magnetic layer containing a ferromagnetic powder and a binder as main components, wherein the ferromagnetic powder is a hexagonal ferrite powder having an average tabular diameter of from 15 to 40 nm, the perpendicular factor of squareness ratio SQ of the magnetic layer is from 0.1 to 0.55, the specific surface area and the total pore volume per weight of the magnetic layer by a nitrogen adsorption method are from 0.1 to 50 m2/g and from 0.001 to 1 ml/g, respectively, and the magnetic layer thickness is from 0.02 to 0.3 &mgr;m.

摘要翻译： 公开了一种磁记录介质，包括一个在其上提供了含有铁磁粉末和粘结剂作为主要成分的磁性层的载体，其中铁磁粉末是平均片状直径为15至40nm的六方铁氧体粉末，垂直于 磁性层的矩形比SQ的因子为0.1〜0.55，通过氮吸附法的磁性层的比表面积和总细孔容积为0.1〜50m 2 / g，0.001〜 1ml / g，磁性层厚度为0.02〜0.3μm。

公开(公告)号：US06506470B2

公开(公告)日：2003-01-14

申请号：US09855574

申请日：2001-05-16

申请人： Takeshi Harasawa ,  Hiroshi Hashimoto ,  Hitoshi Noguchi ,  Shinji Saito

发明人： Takeshi Harasawa ,  Hiroshi Hashimoto ,  Hitoshi Noguchi ,  Shinji Saito

IPC分类号： G11B5708

CPC分类号： G11B5/71 ,  G11B5/708 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/265

摘要： The present invention provides a magnetic recording medium having high electromagnetic transfer characteristics in a high-density recording medium. The invention provides a magnetic recording medium, which comprises a nonmagnetic primer layer placed on a nonmagnetic support member and at least one layer of magnetic layers with ferromagnetic powder dispersed in a binder, said magnetic layer being placed on said primer layer, whereby diamond particles with average particle size of 0.05 to 1 &mgr;m are added to the magnetic layer, and at least one type of compound selected from the following genera formulae (1) and (2) is contained: where R1 represents an alkyl group having 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： 本发明提供一种在高密度记录介质中具有高电磁传递特性的磁记录介质。 本发明提供了一种磁记录介质，其包括放置在非磁性支撑构件上的非磁性底漆层和分散在粘合剂中的铁磁粉末的至少一层磁性层，所述磁性层置于所述底漆层上，由此金刚石颗粒与 将平均粒径为0.05〜1μm的粒子添加到磁性层中，并且含有至少一种选自下列通式（1）和（2）的化合物：其中R 1表示具有1至2个碳原子的烷基 ; 并且R 2，R 3和R 4各自表示碳原子数为4〜21的烃基。

公开(公告)号：US08236434B2

公开(公告)日：2012-08-07

申请号：US12295541

申请日：2007-03-30

申请人： Takeshi Harasawa ,  Masahito Oyanagi

发明人： Takeshi Harasawa ,  Masahito Oyanagi

IPC分类号： G11B5/706

CPC分类号： G11B5/70 ,  G11B5/70678 ,  G11B5/714 ,  G11B5/735

摘要： The present invention relates to a magnetic recording medium comprising a magnetic layer comprising a hexagonal ferrite powder and a binder on one surface of a nonmagnetic support and a backcoat layer on the other surface of the nonmagnetic support. A power spectrum density at a pitch of 10 micrometers ranges from 800 to 10,000 nm3 on the magnetic layer surface, a power spectrum density at a pitch of 10 micrometers ranges from 20,000 to 80,000 nm3 on the backcoat layer surface, the magnetic layer has a center surface average surface roughness Ra, as measured by an atomic force microscope, ranging from 0.5 to 2.5 nm, and the hexagonal ferrite powder has an average plate diameter ranging from 10 to 40 nm.

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的一个表面上包含六方铁氧体粉末和粘合剂的磁性层，以及在非磁性载体的另一表面上的背涂层。 在磁性层表面上，间距为10微米的功率谱密度范围为800至10,000nm 3，在背涂层表面上的间距为10微米的功率谱密度范围为20,000至80,000nm 3，磁性层具有中心 由原子力显微镜测得的表面平均表面粗糙度Ra为0.5〜2.5nm，六方晶系铁氧体粉末的平均板直径为10〜40nm。

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：US20100200357A1

公开(公告)日：2010-08-12

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： F16D13/58

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： Providing an alarm device for a clutch that issues an alarm the clutch lifetime prior to the clutch lifetime expiration, so that the information regarding the lifetime expiration is informed of; further, the failure protection measures for the clutch are adopted. An alarm device for a clutch, whereby a clutch disc connected to an input shaft is connected to or disconnected from a counter clutch disc connected to an output shaft, so that the input shaft is connected to or disconnected from the output shaft; wherein, the clutch comprises: the slip heat release threshold setting means 104, the slip heat release calculator 105, the alarm device 11; wherein, the slip heat release threshold setting means establishes a threshold criteria as to the clutch damage or the clutch lifetime, in a form of the relation between the heat release generated in a clutch slip operation (so called half-clutch operation) and the frequency of the heat release occurrences, thereby the heat release is measured per every predetermined time increment (interval), and the number of the occurrences is counted through the predetermined clutch slip operation duration under a clutch operation mode condition till the clutch is damaged, the duration being changed and repeated so that the frequency as to every predetermined heat release interval to which the generated heat release belongs is counted; the slip heat release calculator 105 calculates the heat release during the clutch operation, based on the hydraulic oil pressure in the actual clutch operation, as well as based on the relative circumferential speed between the disc and the counter disc; the alarm device 11 issues an alarm based on the calculation result through the slip heat release calculating means 105, as well as based on the slip heat release threshold setting means 104.

摘要翻译： 提供用于离合器的报警装置，其在离合器有效期满之前发出报警离合器寿命，从而通知有关终身期满的信息; 此外，采用离合器的故障保护措施。 一种用于离合器的报警装置，其中连接到输入轴的离合器盘与连接到输出轴的反离合器盘连接或断开，使得输入轴连接到输出轴或与输出轴断开; 其中，离合器包括：滑移热释放阈值设定装置104，滑移散热计算器105，报警装置11; 其中，滑移热释放阈值设定装置以离合器打滑操作（所谓的半离合器操作）中产生的放热与频率之间的关系的形式，建立关于离合器损坏或离合器寿命的阈值准则 发生热释放，从而每隔预定时间增量（间隔）测量放热量，并且在离合器操作模式条件下通过预定的离合器打滑操作持续时间计数出现次数，直到离合器损坏，持续时间 对所产生的热释放所属的每个预定的热释放间隔的频率进行计数; 滑移散热计算器105基于实际离合器操作中的液压油以及基于盘和计数盘之间的相对圆周速度来计算离合器操作期间的热释放; 报警装置11基于滑移热释放计算装置105的计算结果以及基于滑移热释放阈值设定装置104发出报警。

公开(公告)号：US20070020490A1

公开(公告)日：2007-01-25

申请号：US11489534

申请日：2006-07-20

申请人： Takeshi Harasawa ,  Masahito Oyanagi

发明人： Takeshi Harasawa ,  Masahito Oyanagi

IPC分类号： G11B5/706

CPC分类号： G11B5/7085 ,  G11B5/7026 ,  G11B5/70605 ,  G11B5/70678 ,  G11B5/714 ,  G11B5/73 ,  G11B5/82

摘要： Provided is a magnetic recording medium for high-density recording, that has excellent electromagnetic characteristics, error rates, and durability. The magnetic recording medium comprises a magnetic layer comprising a ferromagnetic powder, a binder and an abrasive on a nonmagnetic support and is employed for recording a magnetic signal on the medium and reproducing the recorded signal with a reproduction head. The abrasive has a Vickers hardness ranging from 18 to 80 GPa and a mean particle diameter ranging from 10 to 100 nm. The magnetic layer comprises the abrasive in a quantity of 5 to 60 weight parts per 100 weight parts of the ferromagnetic powder and has a thickness ranging from 10 to 100 nm. The number of abrasive present on the surface of the magnetic layer ranges from 0.01 to 1 per {(minimum bit length of the recorded signal)×(read track width of the reproduction head)} micrometer2.

摘要翻译： 提供了一种用于高密度记录的磁记录介质，其具有优异的电磁特性，误差率和耐久性。 磁记录介质包括在非磁性载体上包含铁磁性粉末，粘合剂和研磨剂的磁性层，并用于在介质上记录磁信号并用再现头再现记录信号。 研磨剂的维氏硬度为18至80GPa，平均粒径为10至100nm。 该磁性层包含每100重量份铁磁粉末5至60重量份的研磨剂，其厚度为10至100纳米。 存在于磁性层表面上的研磨剂的数量在每（{记录信号的最小位长度）×（再生磁头的读取磁道宽度）}微米 2之间为0.01-1。