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公开(公告)号：US07368189B2
公开(公告)日：2008-05-06
申请号：US11042064
申请日：2005-01-26
申请人： Mikio Ohno , Tatsuo Ishikawa , Tomohiro Ichikawa
发明人： Mikio Ohno , Tatsuo Ishikawa , Tomohiro Ichikawa
CPC分类号： B32B27/36 , B32B27/14 , B32B2307/20 , B32B2307/538 , B32B2429/02 , G11B5/70 , G11B5/7305 , G11B5/733 , G11B5/735 , Y10T428/31786
摘要： A magnetic recording medium comprising: a magnetic layer containing ferromagnetic powder and a binder; a nonmagnetic support; and a back coat layer, in this order, wherein the nonmagnetic support contains polyester having an intrinsic viscosity of from 0.40 to 0.60 dl/g and a number average molecular weight of from 12,000 to 24,000, a surface of the magnetic layer on a side not having the nonmagnetic support has a surface roughness Ra of from 1 to 5 nm, and a surface of the back coat layer on a side not having the nonmagnetic support has a surface roughness Ra of from 6 to 20 nm.
摘要翻译： 一种磁记录介质，包括：含有铁磁粉末和粘合剂的磁性层; 非磁性支撑; 和背涂层，其中非磁性载体含有特性粘度为0.40至0.60dl / g，数均分子量为12,000至24,000的聚酯，磁性层的表面不在 具有非磁性载体的表面粗糙度Ra为1〜5nm，背面层的不具有非磁性载体的表面的表面粗糙度Ra为6〜20nm。
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公开(公告)号：US07349182B2
公开(公告)日：2008-03-25
申请号：US11049877
申请日：2005-02-04
申请人： Mikio Ohno , Tomohiro Ichikawa , Tatsuo Ishikawa
发明人： Mikio Ohno , Tomohiro Ichikawa , Tatsuo Ishikawa
IPC分类号： G11B5/78
CPC分类号： G11B5/73
摘要： A magnetic recording medium for being used in a write/read system in which a difference of track width between write track width and read track width is smaller than 10 μm, which comprises: a magnetic layer containing ferromagnetic powder and a binder; a nonmagnetic support; and a backcoating layer, in this order, at least one of the magnetic layer and the backcoating layer having servo signals for tracking control pre-recorded therein, wherein the nonmagnetic support is a film of a polyester having an intrinsic viscosity of 0.40 to 0.60 dl/g and a number average molecular weight of 12000 to 24000.
摘要翻译： 一种用于写入/读取系统的磁记录介质，其中写入磁道宽度和读取磁道宽度之间的磁道宽度的差小于10um，其包括：包含铁磁性粉末和粘合剂的磁性层; 非磁性支撑; 和背涂层，其中磁性层和背涂层中的至少一个具有用于在其中预先记录的跟踪控制的伺服信号，其中非磁性载体是特性粘度为0.40至0.60dl的聚酯膜 / g，数均分子量为12000〜24000。
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公开(公告)号：US20050202289A1
公开(公告)日：2005-09-15
申请号：US11049891
申请日：2005-02-04
申请人： Tatsuo Ishikawa , Mikio Ohno , Tomohiro Ichikawa
发明人： Tatsuo Ishikawa , Mikio Ohno , Tomohiro Ichikawa
CPC分类号： G11B5/70 , G11B5/7305 , G11B5/735 , Y10T428/31794
摘要： A magnetic recording tape comprising a nonmagnetic support and a magnetic layer containing ferromagnetic powder and a binder, wherein the nonmagnetic support has an intrinsic viscosity of from 0.40 to 0.60 dl/g and a number average molecular weight of from 12,000 to 24,000, and a distance between an apex of a maximum convexity and a valley of a maximum concavity of the nonmagnetic support on a cross section of an edge of the tape made by cutting the tape in a transverse direction is 2 μm or less in the transverse direction.
摘要翻译： 一种磁记录带，其包含非磁性载体和含有铁磁性粉末和粘合剂的磁性层，其中所述非磁性载体的特性粘度为0.40至0.60dl / g，数均分子量为12,000至24,000， 在通过沿横向方向切割带而制成的带的边缘的横截面上的非磁性载体的最大凹凸的顶点与最大凹部的谷之间的宽度在横向上为2μm或更小。
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公开(公告)号：US20050175866A1
公开(公告)日：2005-08-11
申请号：US11049877
申请日：2005-02-04
申请人： Mikio Ohno , Tomohiro Ichikawa , Tatsuo Ishikawa
发明人： Mikio Ohno , Tomohiro Ichikawa , Tatsuo Ishikawa
CPC分类号： G11B5/73
摘要： A magnetic recording medium for being used in a write/read system in which a difference of track width between write track width and read track width is smaller than 10 μm, which comprises: a magnetic layer containing ferromagnetic powder and a binder; a nonmagnetic support; and a backcoating layer, in this order, at least one of the magnetic layer and the backcoating layer having servo signals for tracking control pre-recorded therein, wherein the nonmagnetic support is a film of a polyester having an intrinsic viscosity of 0.40 to 0.60 dl/g and a number average molecular weight of 12000 to 24000.
摘要翻译： 一种用于写入/读取系统的磁记录介质，其中写入磁道宽度和读取磁道宽度之间的磁道宽度的差小于10um，其包括：包含铁磁粉末和粘合剂的磁性层; 非磁性支撑; 和背涂层，其中磁性层和背涂层中的至少一个具有用于在其中预先记录的跟踪控制的伺服信号，其中非磁性载体是特性粘度为0.40至0.60dl的聚酯膜 / g，数均分子量为12000〜24000。
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公开(公告)号：US20050170213A1
公开(公告)日：2005-08-04
申请号：US11042064
申请日：2005-01-26
申请人： Mikio Ohno , Tatsuo Ishikawa , Tomohiro Ichikawa
发明人： Mikio Ohno , Tatsuo Ishikawa , Tomohiro Ichikawa
IPC分类号： G11B5/64 , B32B27/36 , G11B5/70 , G11B5/73 , G11B5/733 , G11B5/735 , G11B5/738 , B32B1/00 , G11B5/68
CPC分类号： B32B27/36 , B32B27/14 , B32B2307/20 , B32B2307/538 , B32B2429/02 , G11B5/70 , G11B5/7305 , G11B5/733 , G11B5/735 , Y10T428/31786
摘要： A magnetic recording medium comprising: a magnetic layer containing ferromagnetic powder and a binder; a nonmagnetic support; and a back coat layer, in this order, wherein the nonmagnetic support contains polyester having an intrinsic viscosity of from 0.40 to 0.60 dl/g and a number average molecular weight of from 12,000 to 24,000, a surface of the magnetic layer on a side not having the nonmagnetic support has a surface roughness Ra of from 1 to 5 nm, and a surface of the back coat layer on a side not having the nonmagnetic support has a surface roughness Ra of from 6 to 20 nm.
摘要翻译： 一种磁记录介质，包括：含有铁磁粉末和粘合剂的磁性层; 非磁性支撑; 和背涂层，其中非磁性载体含有特性粘度为0.40至0.60dl / g，数均分子量为12,000至24,000的聚酯，磁性层的表面不在 具有非磁性载体的表面粗糙度Ra为1〜5nm，背面层的不具有非磁性载体的表面的表面粗糙度Ra为6〜20nm。
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公开(公告)号：US07381485B2
公开(公告)日：2008-06-03
申请号：US11049891
申请日：2005-02-04
申请人： Tatsuo Ishikawa , Mikio Ohno , Tomohiro Ichikawa
发明人： Tatsuo Ishikawa , Mikio Ohno , Tomohiro Ichikawa
CPC分类号： G11B5/70 , G11B5/7305 , G11B5/735 , Y10T428/31794
摘要： A magnetic recording tape comprising a nonmagnetic support and a magnetic layer containing ferromagnetic powder and a binder, wherein the nonmagnetic support has an intrinsic viscosity of from 0.40 to 0.60 dl/g and a number average molecular weight of from 12,000 to 24,000, and a distance between an apex of a maximum convexity and a valley of a maximum concavity of the nonmagnetic support on a cross section of an edge of the tape made by cutting the tape in a transverse direction is 2 μm or less in the transverse direction.
摘要翻译： 一种磁记录带，其包含非磁性载体和含有铁磁性粉末和粘合剂的磁性层，其中所述非磁性载体的特性粘度为0.40至0.60dl / g，数均分子量为12,000至24,000， 在通过沿横向方向切割带而制成的带的边缘的横截面上的非磁性载体的最大凹凸的顶点与最大凹部的谷之间的宽度在横向上为2μm或更小。
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公开(公告)号：US07045227B2
公开(公告)日：2006-05-16
申请号：US10804145
申请日：2004-03-19
申请人： Tatsuo Ishikawa , Mikio Ohno
发明人： Tatsuo Ishikawa , Mikio Ohno
IPC分类号： G11B5/738
CPC分类号： G11B5/738 , G11B5/70 , G11B5/714 , G11B5/735 , Y10T428/31551
摘要： A magnetic recording medium comprising: a nonmagnetic support; an undercoat layer containing a compound polymerizable by radiation exposure; and a magnetic layer containing ferromagnetic powder and a binder, in this order wherein the undercoat layer has a thickness of from 0.1 to 1 μm, the binder contains a polyurethane resin having a glass transition temperature of from 100 to 200° C., the magnetic layer has a thickness of from 20 to 150 nm, and an average particle size of the ferromagnetic powder is from 20 to 60 nm.
摘要翻译： 一种磁记录介质，包括：非磁性载体; 含有通过辐射照射可聚合的化合物的底涂层; 和含有铁磁性粉末和粘合剂的磁性层，其中底涂层的厚度为0.1〜1μm，粘合剂含有玻璃化转变温度为100〜200℃的聚氨酯树脂，磁性 层的厚度为20〜150nm，铁磁性粉末的平均粒径为20〜60nm。
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公开(公告)号：US06991862B2
公开(公告)日：2006-01-31
申请号：US10810830
申请日：2004-03-29
申请人： Mikio Ohno , Tatsuo Ishikawa
发明人： Mikio Ohno , Tatsuo Ishikawa
IPC分类号： G11B5/702
CPC分类号： G11B5/7021 , G11B5/70 , G11B5/714
摘要： In one aspect, the magnetic recording medium comprises a magnetic layer comprising a ferromagnetic powder and a binder and said binder comprises polyurethane resin having a glass transition temperature of 100 to 200° C. In a second aspect, 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 and at least the binder comprised in said magnetic layer comprises polyurethane resin having a glass transition temperature of 100 to 200° C. In both aspects, said magnetic layer has a thickness equal to or less than 0.15 μm, said ferromagnetic powder has a mean major axis length or a mean plate diameter of 60 nm or less, and said magnetic layer has a coercivity of 159 to 239 kA/m in a longitudinal or in-plane direction.
摘要翻译： 一方面，磁记录介质包括含有铁磁粉末和粘合剂的磁性层，所述粘合剂包含玻璃化转变温度为100-200℃的聚氨酯树脂。在第二方面，磁记录介质包括非磁性层 在非磁性载体上依次包含非磁性粉末和粘合剂以及包含铁磁粉末和粘合剂的磁性层，并且至少包含在所述磁性层中的粘合剂包含玻璃化转变温度为100-200℃的聚氨酯树脂。 在两个方面，所述磁性层具有等于或小于0.15μm的厚度，所述铁磁粉末具有平均长轴长度或60nm或更小的平均板直径，并且所述磁性层的矫顽力为159至239kA / m的纵向或平面方向。
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公开(公告)号：US20080017741A1
公开(公告)日：2008-01-24
申请号：US11578409
申请日：2004-04-13
申请人： Tomohiro Ichikawa , Mikio Ohno , Kiyomi Ejiri
发明人： Tomohiro Ichikawa , Mikio Ohno , Kiyomi Ejiri
IPC分类号： G11B23/107
CPC分类号： G11B23/107 , G11B5/627 , G11B23/037 , G11B23/26
摘要： An object is to provide a leader tape which suppresses the increase of dropout resulting from imprinting of the drive reel or leader block part due to storage for a long time or running at a high temperature and hardly causes the edge damage of a magnetic tape, and also provide a magnetic tape cartridge using the leader tape. 1) A leader tape LT including a support having provided on at least one surface thereof a coating layer, wherein Ra on at least one surface of the leader tape is from 10 to 60 nm and the maximum curving amount in the longitudinal direction is 3 mm/m or less; and 2) a magnetic tape cartridge including a cartridge case; and a single reel or a plurality of reels, each reel being rotatably housed in the cartridge case and having a magnetic tape wound therearound, in which the magnetic tape has a leader tape of 1), the leader tape being jointed to an leading end of the magnetic tape and drawn out into a magnetic recording and reproducing apparatus while leading the magnetic tape.
摘要翻译： 目的在于提供一种引导带，其能够抑制由于长时间存储或高温运转而导致的驱动卷轴或引导块部件的压印引起的压差增加，并且几乎不引起磁带的边缘损坏， 还提供使用引导带的磁带盒。 1）一种引导带LT，其包括在其至少一个表面上设置有涂层的支撑体，其中，引导带的至少一个表面上的Ra为10〜60nm，纵向的最大弯曲量为3mm / m以下; 和2）包括盒壳体的磁带盒; 以及单个卷轴或多个卷轴，每个卷轴可旋转地容纳在盒壳体中并且具有卷绕在其上的磁带，其中磁带具有引导带1），引导带连接到 磁带并在引导磁带的同时被引出到磁记录和再现装置中。
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10.发明申请公开(公告)号：US20050214594A1
公开(公告)日：2005-09-29
申请号：US11090053
申请日：2005-03-28
申请人： Mikio Ohno
发明人： Mikio Ohno
IPC分类号： G11B5/627 , B32B5/16 , G11B15/18 , G11B23/107 , G11B23/26
CPC分类号： G11B5/627 , G11B23/107 , Y10T428/25
摘要： A leader tape has, on at least one face of a support, a coating layer that contains a powder and a binder, which is characterized in that the center line average roughness (Ra) of at least one face of the leader tape is from 10 to 60 nm, the leader tape is used in a magnetic recording and reproduction device where the line recording density is at least 100 kfci, and the difference between the recording track width and the reproduction track width is from 0 to 16 μm.
摘要翻译： 引导带在支撑体的至少一个面上具有包含粉末和粘合剂的涂层，其特征在于，引带的至少一个面的中心线平均粗糙度（Ra）为10 在磁记录和再现装置中使用领先带，线记录密度至少为100kfci，记录磁道宽度和再现磁道宽度之差为0至16μm。
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