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1. 发明授权

US06365261B1 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06365261B1
公开(公告)日：2002-04-02
申请号：US09562543
申请日：2000-05-02
申请人： Shigeharu Watase , Yutaka Takahashi
发明人： Shigeharu Watase , Yutaka Takahashi
IPC分类号： B32B310
CPC分类号： B32B7/02 , B32B27/34 , G11B5/7305 , Y10T428/24355 , Y10T428/31725
摘要： A conventional film-type magnetic recording medium having a overall thickness of 7 &mgr;m or less has unsatisfactory stiffness, and when surface undulations are suppressed and the thickness of the substrate is reduced, clogging at the rotary head is frequently observed. The invention solves this problem by a tape-type magnetic recording medium which comprises a nonmagnetic substrate and at least a magnetic layer thereon and has the overall thickness of 7 &mgr;m or less, wherein the width of the tape is 6.5 mm or more and the difference in the centerplane average roughness (SRa) of said magnetic layer is in the range defined below: 3 nm≦SRa (Cutoff: 800 &mgr;m)−SRa (Cutoff: 80 &mgr;m)≦15 nm Especially, the nonmagnetic substrate is an aromatic polyamide.
摘要翻译：总厚度为7μm以下的常规膜型磁记录介质的刚度不足，当表面起伏被抑制并且基板的厚度减小时，经常观察到旋转头处的堵塞。本发明通过一种带式磁记录介质解决了这个问题，该介质包括一个非磁性基片和至少一个磁性层，总厚度为7μm或更小，其中带的宽度为6.5mm或更大，所述磁性层的中心面平均粗糙度（SRa）在下述范围内：特别地，非磁性基材为芳香族聚酰胺。

2. 发明授权

US5783296A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5783296A
公开(公告)日：1998-07-21
申请号：US835022
申请日：1997-03-27
申请人： Kazunori Tamazaki , Shigeharu Watase , Osamu Inoue
发明人： Kazunori Tamazaki , Shigeharu Watase , Osamu Inoue
IPC分类号： C08G69/32 , C08G69/26 , G11B5/70 , G11B5/73 , G11B5/735 , G11B5/704
CPC分类号： G11B5/73 , Y10S428/90 , Y10T428/24975 , Y10T428/256 , Y10T428/31725
摘要： This invention concerns a magnetic recording medium which comprises a nonmagnetic support, a magnetic layer provided on one surface of the nonmagnetic support and a backcoat layer provided on the other surface of the nonmagnetic support, wherein the nonmagnetic support is provided with such physical properties as Young's moduluses in the longitudinal direction and the lateral direction thereof in the range of 1300-1600 kg/cm.sup.2, respectively, and a breaking elongation in the range of 3-10% and said magnetic recording medium is provided on the magnetic layer side thereof with a convex cupping the magnitude of which is in the range of 0.02-0.20 mm at a width of 3.8 mm. The magnetic recording medium, therefore, realizes perfect head touch even when the thickness of the nonmagnetic support and the thickness of the whole medium are small. Even when the magnetic recording medium is exposed to the mechanical influences and physical influences of aging, it suffers extremely small change in the form (such as, for example, the cupping value) and therefore conserves the head touch and other factors in highly satisfactory state. It suffers occurrence of dropout or head stain only sparingly.
摘要翻译：本发明涉及一种磁记录介质，其包括非磁性载体，设置在非磁性载体的一个表面上的磁性层和设置在非磁性载体的另一个表面上的背涂层，其中非磁性载体具有诸如杨氏在纵向方向和横向方向分别在1300-1600kg / cm2范围内，在3-10％的范围内的断裂伸长率和所述磁记录介质在其磁性层侧上设置有凸起拔罐，其幅度在宽度为3.8mm的0.02-0.20mm的范围内。因此，即使当非磁性载体的厚度和整个介质的厚度小时，磁记录介质也实现了完美的头部触摸。即使当磁记录介质暴露于老化的机械影响和物理影响时，其形状（例如，拔罐值）也发生非常小的变化，因此在令人满意的状态下节省了头部接触等因素。只有少量出现辍学或头部染色。

3. 发明授权

US06472063B1 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06472063B1
公开(公告)日：2002-10-29
申请号：US09660504
申请日：2000-09-12
申请人： Shigeharu Watase
发明人： Shigeharu Watase
IPC分类号： G11B5702
CPC分类号： G11B5/7022 , G11B5/7023 , Y10S428/90 , Y10T428/265
摘要： A magnetic recording medium comprising at least a lower non-magnetic layer containing at least a non-magnetic powders and a binder resin formed on a non-magnetic support and an upper magnetic layer formed on the lower non-magnetic layer, wherein the magnetic recording medium is used for a recording-reproducing system in which recorded signals are reproduced by an MR head, and a plastic deformation hardness Hv from the upper magnetic layer surface to an indentation depth of 0.1 &mgr;m is 100 to 200 mgf/&mgr;m2and a Young's modulus E in a thickness direction from the upper magnetic layer surface to the indentation depth of 0.1 &mgr;m is 2000 to 3000 mgf/&mgr;m2.
摘要翻译：一种磁记录介质，其至少包含至少含有非磁性粉末和形成在非磁性载体上的粘合剂树脂的下部非磁性层和形成在下部非磁性层上的上部磁性层，其中磁性记录介质用于通过MR磁头再现记录信号的记录再现系统，并且从上磁性层表面到压痕深度为0.1μm的塑性变形硬度Hv为100至200mgf / mum2，杨氏模量E 在从上磁性层表面到压痕深度为0.1μm的厚度方向上为2000〜3000mgf / mum2。

4. 发明授权

US5906885A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5906885A
公开(公告)日：1999-05-25
申请号：US622282
申请日：1996-03-25
申请人： Youichi Yoshimura , Shigeharu Watase
发明人： Youichi Yoshimura , Shigeharu Watase
IPC分类号： G11B5/68 , G11B5/708 , G11B5/84
CPC分类号： G11B5/84 , G11B5/68 , G11B5/708 , G11B5/7085 , Y10S428/90 , Y10T428/24975 , Y10T428/25 , Y10T428/265
摘要： A magnetic recording medium includes a flexible substrate, a coating layer formed on the flexible substrate, and a magnetic layer formed on the coating layer. The coating layer contains a binder and nonmagnetic particles and has a thickness in the range of 0.05 to 0.7 .mu.m as a result of a stretching treatment performed at least once after application of the coating layer on the flexible substrate. The magnetic layer contains magnetic powder, a binder and an abrasive and has a thickness in the range of 0.05 to 1.0 .mu.m. The nonmagnetic particles contained in the coating layer has an average particle size in the range of 0.01 to 0.08 .mu.m. The abrasive contained in the magnetic layer has an average particle size in the range of 0.05 to 0.8 .mu.m and satisfies conditions defined by the following equations (1) and (2):d.sub.mx .ltoreq.(d.sub.av .times.2.0)+0.5 equation (1)d.sub.mx .ltoreq.t.sub.c +t.sub.m +0.5 equation (2)wherein d.sub.mx represents a maximum particle size of the abrasive, d.sub.av represents an average particle size of the abrasive, t.sub.c represents a thickness of the coating layer, and t.sub.m represents a thickness of the magnetic layer. With this arrangement, the magnetic recording medium is excellent in productivity and further improves a surface property of the thin magnetic layer. This achieves high outputs at a region of shorter wavelength and further achieves excellent running durability.
摘要翻译：磁记录介质包括柔性基板，形成在柔性基板上的涂层以及形成在涂层上的磁性层。作为涂布层在柔性基板上进行至少一次拉伸处理的结果，涂层含有粘合剂和非磁性粒子，其厚度为0.05〜0.7μm。磁性层含有磁性粉末，粘合剂和研磨剂，其厚度为0.05〜1.0μm。包含在涂层中的非磁性粒子的平均粒径在0.01〜0.08μm的范围内。包含在磁性层中的磨料具有在0.05至0.8μm范围内的平均粒度，并且满足由以下等式（1）和（2）定义的条件：dmx

5. 发明授权

US5567502A Magnetic recording medium having a magnetic layer containing abrasive particles 失效
标题翻译：具有含有磨粒的磁性层的磁记录介质
公开(公告)号：US5567502A
公开(公告)日：1996-10-22
申请号：US405192
申请日：1995-03-16
申请人： Hiroyuki Miyabara , Shigeharu Watase , Yoshio Kawakami , Kiyoto Fukushima
发明人： Hiroyuki Miyabara , Shigeharu Watase , Yoshio Kawakami , Kiyoto Fukushima
IPC分类号： B32B27/18 , B32B33/00 , C09D5/23 , C09D7/12 , G11B5/708 , G11B5/716 , G11B5/73 , G11B5/733
CPC分类号： G11B5/716 , G11B5/7085 , G11B5/7305 , Y10S428/90 , Y10T428/24355 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： Disclosed is a magnetic recording medium comprising a nonmagnetic support and a paint film layer which is provided on the support and has a lamination structure consisting of two or more layers, wherein the top surface magneticlayer of the layers constituting the paint film layer contains abrasive particles having a Mohs hardness of not less than 6 in an amount of 3 to 16 parts by weight based on 100 parts by weight of a ferromagnetic powder and has a thickness of not more than 0.5 .mu.m, a ratio of a mean particle diameter of the abrasive particles to the thickness of the top surface magnetic layer is in the range of 1.0 to 1.8, and a content of the abrasive particles each having a size larger than the thickness of the top surface magnetic layer in the particle size distribution of the abrasive particles is in the range of 50 to 90% by weight. The magnetic recording medium having such constitution is excellent in running endurance and running properties and shows high electromagnetic conversion characteristics.
摘要翻译：公开了一种包含非磁性载体和涂膜层的磁记录介质，其设置在载体上并具有由两层或多层组成的层压结构，其中构成涂膜层的层的顶表面层是含有具有相对于100重量份铁磁性粉末为3〜16重量份的莫氏硬度为6以上，厚度为0.5μm以下，磨料的平均粒径的比例与上表面磁性层的厚度相关的粒子在1.0〜1.8的范围内，磨粒的粒径分别大于上表面磁性层的厚度的磨粒的含量为在50至90重量％的范围内。具有这种结构的磁记录介质具有优异的运行耐久性和运行性能，并且显示出高的电磁转换特性。

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