公开(公告)号：US5935674A

公开(公告)日：1999-08-10

申请号：US886468

申请日：1997-07-01

申请人： Shinji Saito ,  Hitoshi Noguchi ,  Yasushi Endo

发明人： Shinji Saito ,  Hitoshi Noguchi ,  Yasushi Endo

IPC分类号： G11B5/70 ,  G11B5/73 ,  G11B5/82

CPC分类号： G11B5/70 ,  G11B5/7305 ,  Y10S428/90 ,  Y10T428/24355

摘要： The present invention provides a disc magnetic recording medium which provides remarkable improvements in electromagnetic characteristics, particularly high density recording properties, and exhibits excellent magnetic properties with various sizes. A disc type magnetic recording medium is disclosed, comprising a substantially non-magnetic layer and a magnetic layer provided on a non-magnetic support in this order, said magnetic layer comprising a ferromagnetic metal fine powder or ferromagnetic hexagonal ferrite fine powder dispersed in a binder, wherein said non-magnetic support is an aramide or polyethylene naphthalate having a central plane average surface roughness SRa of not more than 10 mm and there is the following relationship between the thickness d (.mu.m) of the non-magnetic support and the outermost diameter D (mm) of the recording area:1.25.ltoreq.D/d.ltoreq.2.50 (when the non-magnetic support is an aramide)1.00.ltoreq.D/d.ltoreq.2.00 (when the non-magnetic support is a polyethylene naphthalate)

摘要翻译： 本发明提供一种盘式磁记录介质，其提供了电磁特性，特别是高密度记录性能方面的显着改进，并表现出优异的各种尺寸的磁特性。 公开了一种盘式磁记录介质，其包括基本上非磁性层和设置在非磁性载体上的磁性层，所述磁性层包含分散在粘合剂中的铁磁性金属细粉末或铁磁六方铁氧体细粉末 其中所述非磁性载体是中心平面平均表面粗糙度SRa不超过10mm的芳族聚酰胺或聚萘二甲酸乙二醇酯，并且非磁性载体的厚度d（μm）与最外层 记录区域的直径D（mm）：1.25

公开(公告)号：US08279554B2

公开(公告)日：2012-10-02

申请号：US13364610

申请日：2012-02-02

申请人： Hitoshi Noguchi ,  Osamu Shimizu ,  Yasushi Endo

发明人： Hitoshi Noguchi ,  Osamu Shimizu ,  Yasushi Endo

IPC分类号： G11B5/78

CPC分类号： G11B5/70 ,  G11B5/00821 ,  G11B5/70678 ,  G11B5/71 ,  G11B5/714

摘要： The magnetic signal reproduction system comprises a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support; and a reproduction head, wherein a number of protrusions equal to or greater than 10 nm in height on the magnetic layer surface, as measured by an atomic force microscope, ranges from 50 to 2500/10,000 μm2, a quantity of lubricant on the magnetic layer surface, denoted as a surface lubricant index, ranges from 0.5 to 5.0, a surface abrasive occupancy of the magnetic layer ranges from 2 to 20 percent, and the reproduction head is a magnetoresistive magnetic head comprising a spin-valve layer.

摘要翻译： 磁信号再现系统包括磁记录介质，其包括在非磁性载体上包含铁磁粉末和粘合剂的磁性层; 以及再现头，其中通过原子力显微镜测量的磁性层表面上的高度等于或大于10nm的突起的数量范围为50至2500 /10,000μm2，磁性层上的润滑剂量 以表面润滑剂指数表示的表面的范围为0.5至5.0，磁性层的表面磨料占有率为2至20％，再现头为包括自旋阀层的磁阻磁头。

公开(公告)号：US20090027812A1

公开(公告)日：2009-01-29

申请号：US12180580

申请日：2008-07-28

申请人： Hitoshi Noguchi ,  Yasushi Endo ,  Osamu Shimizu ,  Makoto Yoshida ,  Kazuhiko Maejima ,  Mitsuyoshi Kawai

发明人： Hitoshi Noguchi ,  Yasushi Endo ,  Osamu Shimizu ,  Makoto Yoshida ,  Kazuhiko Maejima ,  Mitsuyoshi Kawai

IPC分类号： G11B5/33

CPC分类号： G11B5/70 ,  G11B5/00826 ,  G11B5/29 ,  G11B5/3106 ,  G11B5/3906 ,  G11B5/70678 ,  G11B5/7085 ,  G11B5/71 ,  G11B5/714

摘要： The magnetic signal reproduction system comprises a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support and a reproduction head, wherein a number of protrusions equal to or greater than 10 nm in height on the magnetic layer surface, as measured by an atomic force microscope, ranges from 50 to 2500/10,000 μm2, a quantity of lubricant on the magnetic layer surface, denoted as a surface lubricant index, ranges from 0.5 to 5.0, a surface abrasive occupancy of the magnetic layer ranges from 2 to 20 percent, the reproduction head is a magnetoresistive magnetic head comprising a spin-valve layer, the spin-valve layer comprises a magnetization free layer, a magnetization pinned layer and an antiferromagnetic layer, and the antiferromagnetic layer is comprised of alloy comprising iridium and manganese, and the reproduction head comes in sliding contact with the magnetic recording medium during signal reproduction.

摘要翻译： 磁信号再现系统包括磁记录介质，磁记录介质包括在非磁性载体上的铁磁性粉末和粘合剂的磁性层和再现磁头，其中在磁性层表面上高度等于或大于10nm的突起数目， 通过原子力显微镜测量的范围为50至2500 / 10,000mum2，表面润滑指数表示为磁性层表面的润滑剂的数量为0.5至5.0，磁性层的表面磨料占据率为 2〜20％，再现头是包括自旋阀层的磁阻磁头，自旋阀层包括磁化自由层，磁化钉扎层和反铁磁层，反铁磁层由包含铱的合金 和锰，并且再现头在信号再现期间与磁记录介质滑动接触。

公开(公告)号：US08164857B2

公开(公告)日：2012-04-24

申请号：US12129131

申请日：2008-05-29

申请人： Hitoshi Noguchi ,  Osamu Shimizu ,  Yasushi Endo

发明人： Hitoshi Noguchi ,  Osamu Shimizu ,  Yasushi Endo

IPC分类号： G11B5/70 ,  G11B5/71

CPC分类号： G11B5/70 ,  G11B5/00821 ,  G11B5/70678 ,  G11B5/71 ,  G11B5/714

摘要： The magnetic signal reproduction system comprises a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support; and a reproduction head, wherein a number of protrusions equal to or greater than 10 nm in height on the magnetic layer surface, as measured by an atomic force microscope, ranges from 50 to 2500/10,000 μm2, a quantity of lubricant on the magnetic layer surface, denoted as a surface lubricant index, ranges from 0.5 to 5.0, a surface abrasive occupancy of the magnetic layer ranges from 2 to 20 percent, and the reproduction head is a magnetoresistive magnetic head comprising a spin-valve layer.

摘要翻译： 磁信号再现系统包括磁记录介质，其包括在非磁性载体上包含铁磁粉末和粘合剂的磁性层; 以及再现头，其中通过原子力显微镜测量的磁性层表面上的高度等于或大于10nm的突起的数量范围为50至2500 /10,000μm2，磁性层上的润滑剂量 以表面润滑剂指数表示的表面的范围为0.5至5.0，磁性层的表面磨料占有率为2至20％，再现头为包括自旋阀层的磁阻磁头。

公开(公告)号：US06839201B2

公开(公告)日：2005-01-04

申请号：US10310182

申请日：2002-12-05

申请人： Yasushi Endo

发明人： Yasushi Endo

IPC分类号： G11B23/00 ,  G11B23/03 ,  G11B23/033

CPC分类号： G11B23/0317 ,  G11B23/0305

摘要： A small magnetic disk cartridge for use in a card disk drive to be loaded in electronic equipment. The magnetic disk cartridge comprises a housing, a disk-mounting hub rotatable within the housing by a spindle provided in the disk drive, and a flexible magnetic disk mounted at one point on the disk-mounting hub.

摘要翻译： 用于卡盘驱动器中的小型磁盘盒装载在电子设备中。 磁盘盒包括壳体，通过设置在盘驱动器中的心轴在壳体内旋转的盘安装毂，以及安装在盘安装毂上的一点处的柔性磁盘。

公开(公告)号：US5773137A

公开(公告)日：1998-06-30

申请号：US667499

申请日：1996-06-21

申请人： Kazuhiro Niitsuma ,  Yasushi Endo

发明人： Kazuhiro Niitsuma ,  Yasushi Endo

IPC分类号： G11B5/702 ,  G11B5/012 ,  G11B5/09 ,  G11B5/738 ,  G11B5/82 ,  B32B5/16

CPC分类号： G11B5/09 ,  G11B5/738 ,  G11B5/012 ,  G11B5/82 ,  Y10T428/24355 ,  Y10T428/25

摘要： A magnetic recording disk having a flexible non-magnetic support, an intervening non-magnetic layer of 0.5 to 5 .mu.m thick which contains as binder and anon-magnetic inorganic powder, and a magnetic layer of 0.02 to 0.5 .mu.m thick containing a binder, a ferromagnetic powder, carbon black and a lubricant to reduced in its tendency to make a magnetic head of a magnetic recording/reproducing device corrosive without reducing its running endurance, by employing a binder polymer containing no chlorine atom in its molecular structure for both the non-magnetic layer and the magnetic layer and by making the magnetic layer to have an upper surface having a Knoop hardness of 14 to 25.

摘要翻译： 一种具有柔性非磁性载体的磁记录盘，0.5至5μm厚的中间非磁性层，其包含作为粘合剂和无机无机粉末的磁性层，以及含有粘合剂的0.02至0.5μm厚的磁性层 ，铁磁粉末，炭黑和润滑剂，通过在其分子结构中使用不含氯原子的粘合剂聚合物来减少磁性记录/再现装置的磁头腐蚀性而不降低其耐久性， 非磁性层和磁性层，并且通过使磁性层具有Knoop硬度为14至25的上表面。

公开(公告)号：US5549955A

公开(公告)日：1996-08-27

申请号：US419757

申请日：1995-04-10

申请人： Toshio Kawamata ,  Satoru Hayakawa ,  Yasushi Endo

发明人： Toshio Kawamata ,  Satoru Hayakawa ,  Yasushi Endo

IPC分类号： G11B5/70 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/06 ,  G11B5/68 ,  G11B5/738 ,  G11B5/84 ,  G11B5/66

CPC分类号： G11B5/68 ,  G11B5/738 ,  G11B5/84 ,  Y10S428/90 ,  Y10T428/265

摘要： A magnetic recording disk having a good overwriting characteristic and an excellent electromagnetic characteristic, as well as superior running durability. The magnetic recording disk comprises a non-magnetic support having coated thereon, in the order, a non-magnetic layer comprising mainly a non-magnetic powder and a binder resin and a magnetic layer comprising mainly a ferromagnetic powder and a binder resin, wherein the magnetic layer is formed by applying a magnetic layer coating solution onto the coated non-magnetic layer while the non-magnetic layer remains in a wet condition, the average thickness of the magnetic layer is 0.5 .mu.m or less, and the maximum thickness and the minimum thickness thereof fall within the range of .+-.15% of the average thickness of the magnetic layer.

摘要翻译： 具有良好的重写特性和优异的电磁特性的磁记录盘，以及优异的运行耐久性。 磁记录盘包括其上涂覆有非磁性层的非磁性载体，主要包括非磁性粉末和粘合剂树脂，以及主要包含铁磁性粉末和粘合剂树脂的磁性层，其中， 通过在非磁性层保持湿润状态下将磁性层涂布液施加到涂布的非磁性层上而形成磁性层，磁性层的平均厚度为0.5μm以下，最大厚度为 其最小厚度落在磁性层的平均厚度的+/- 15％的范围内。

公开(公告)号：US06863948B2

公开(公告)日：2005-03-08

申请号：US10303902

申请日：2002-11-26

申请人： Yasushi Endo

发明人： Yasushi Endo

IPC分类号： G11B5/82 ,  G11B23/00

CPC分类号： G11B23/0021 ,  G11B5/825 ,  Y10T428/219

摘要： A disk-shaped magnetic recording medium for use in a small magnetic disk cartridge, comprising a flexible disk-shaped magnetic sheet, and a rigid annular member attached to the outer circumferential edge portion of one side of the magnetic sheet.

摘要翻译： 一种用于小型磁盘盒的盘形磁记录介质，包括柔性盘状磁性片，以及安装在磁性片的一侧的外周边缘部分上的刚性环形件。

公开(公告)号：US5300343A

公开(公告)日：1994-04-05

申请号：US619531

申请日：1990-11-29

申请人： Yasushi Endo ,  Kunihiko Sano ,  Mikihiko Kato

发明人： Yasushi Endo ,  Kunihiko Sano ,  Mikihiko Kato

IPC分类号： C09D5/23 ,  C09D163/00 ,  C09D163/10 ,  C09D175/00 ,  C09D175/06 ,  G11B5/70 ,  G11B5/702 ,  G11B5/706 ,  G11B5/714 ,  G11B5/82 ,  G11B5/84 ,  G11B5/00

CPC分类号： G11B5/7023 ,  G11B5/714 ,  G11B5/84 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/2982 ,  Y10T428/31 ,  Y10T428/3158 ,  Y10T428/31935

摘要： A novel magnetic disc and process for the preparation thereof is disclosed, comprising a nonmagnetic support having thereon a magnetic layer comprising ferromagnetic metal particles and a binder resin containing at least a vinyl chloride copolymer, wherein the crystallite size of the ferromagnetic metal particles as determined by X-ray diffraction method is 300 .ANG. or less, and the ratio .alpha. at the surface of the magnetic layer of the integrated intensity of the Cl-2P spectrum as determined by X-ray photoelectron spectroscopy to that of the Fe-2P(3/2) spectrum is in the range of from 0.50 to 0.90. In a preferred embodiment, the vinyl chloride copolymer contains at least one polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --PO.sub.3 M.sub.2, and --CO.sub.2 M wherein M represents hydrogen, an alkali metal or ammonium and at least one epoxy ring in the copolymer molecule.

摘要翻译： 公开了一种新型的磁盘及其制备方法，其包括其上具有包含铁磁性金属颗粒的磁性层和至少含有氯乙烯共聚物的粘合剂树脂的非磁性载体，其中由铁磁性金属颗粒的微晶尺寸由 X射线衍射法为300（Aangstroem）以下，通过X射线光电子能谱测定的Cl-2P光谱的积分强度的磁性层表面的比例（α）与Fe- 2P（3/2）光谱在0.50至0.90的范围内。 在优选的实施方案中，氯乙烯共聚物含有至少一种选自-SO 3 M，-OSO 3 M，-PO 3 M 2和-CO 2 M的极性基团，其中M表示氢，碱金属或铵和至少一个环氧环 共聚物分子。

公开(公告)号：US5091238A

公开(公告)日：1992-02-25

申请号：US534912

申请日：1990-06-08

申请人： Mikihiko Kato ,  Hiroshi Hashimoto ,  Yasushi Endo ,  Yasuo Nagashima

发明人： Mikihiko Kato ,  Hiroshi Hashimoto ,  Yasushi Endo ,  Yasuo Nagashima

IPC分类号： C09D5/23 ,  C09D101/08 ,  C09D175/06 ,  G11B5/702 ,  G11B5/706

CPC分类号： G11B5/7025 ,  Y10S428/90 ,  Y10T428/2982 ,  Y10T428/31591 ,  Y10T428/3179

摘要： A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer comprising mainly ferromagnetic metal particles of a specific surface area and binder resins, wherein at least part of said binder resins is a cellulosic resin having in side chains of the molecules thereof a polar group which is a sulfonic acid group, a metal sulfonate group, a phosphoric acid group, or a metal phosphate group.

摘要翻译： 公开了一种磁记录介质，其包括其上具有主要包含比表面积的铁磁金属颗粒和粘合剂树脂的磁性层的非磁性载体，其中至少部分所述粘合剂树脂是具有分子侧链的纤维素树脂 作为磺酸基的极性基团，金属磺酸盐基，磷酸基或金属磷酸酯基。