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

IPC分类号： G11B5/66 ,  B32B27/06

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。

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。

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。

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。

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

IPC分类号： G11B5/73 ,  B32B5/16 ,  G11B5/68 ,  G11B5/70 ,  G11B5/735 ,  G11B5/738

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。

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

IPC分类号： G11B5/584 ,  G11B5/73 ,  G11B5/735 ,  G11B5/738 ,  G11B5/147

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。

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。

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

IPC分类号： B32B5/04 ,  B32B5/716

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。

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。

公开(公告)号：US06692849B2

公开(公告)日：2004-02-17

申请号：US09956036

申请日：2001-09-20

申请人： Hiroaki Araki ,  Mikio Ohno ,  Toshichika Aoki

发明人： Hiroaki Araki ,  Mikio Ohno ,  Toshichika Aoki

IPC分类号： B32B516

CPC分类号： G11B5/70 ,  G11B5/7085 ,  G11B5/714 ,  Y10T428/24355 ,  Y10T428/24372

摘要： A magnetic recording medium is provided comprising a non-magnetic support and at least one magnetic layer comprising ferromagnetic metal particles principally containing iron, having a spindle shape and having an average major axis length of 0.15 &mgr;m or less, and a binder resin, and optionally further comprising, between the support and the magnetic layer, at least one adhesive layer or at least one non-magnetic layer principally containing a non-magnetic inorganic powder and a binder, and wherein center line average surface roughness Ra of the magnetic layer surface being 2 to 6 nm, said recording medium having the following properties; steel ball wear at 23° C. and 70% RH being 2×10−5 to 4×10−5 mm3, surface C/Fe ratio measured by Auger electron spectroscopy being 50 to 100, and coefficient of friction between the magnetic layer surface and an SUS rod having a roughness of 8 to 10 nm being 0.2 to 0.3.

摘要翻译： 提供了一种磁记录介质，其包括非磁性载体和至少一个磁性层，所述至少一个磁性层包含主要包含铁的铁磁性金属颗粒，其主轴形状和平均长轴长度为0.15μm或更小，以及粘合剂树脂， 还包括在所述支撑体和所述磁性层之间的至少一个粘合剂层或主要包含非磁性无机粉末和粘合剂的至少一个非磁性层，并且其中所述磁性层表面的中心线平均表面粗糙度Ra为 2〜6nm，所述记录介质具有以下特性; 在23℃和70％RH下的钢球磨损为2×10 -5至4×10 -5 mm 3，通过俄歇电子能谱法测得的表面C / ​​Fe比为50至100，摩擦系数 磁性层表面和粗糙度为8〜10nm的SUS棒为0.2〜0.3。