公开(公告)号：US5718964A

公开(公告)日：1998-02-17

申请号：US738727

申请日：1996-10-28

申请人： Koji Naoe ,  Kiyomi Ejiri ,  Hiroaki Takano

发明人： Koji Naoe ,  Kiyomi Ejiri ,  Hiroaki Takano

IPC分类号： G11B5/70 ,  G11B5/708

CPC分类号： G11B5/70 ,  G11B5/708 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/256

摘要： A magnetic recording medium is disclosed, comprising a flexible non-magnetic medium having on at least one surface thereof a magnetic layer comprising a ferromagnetic powder dispersed in a binder, wherein the heights and the existing densities of the abrasive projections and the non-abrasive projections on the surface of the magnetic layer are defined in the specific ranges. The magnetic recording medium are excellent in the electromagnetic characteristics, the magnetic head abrasion resistance, and the running durability.

摘要翻译： 公开了一种磁记录介质，包括柔性非磁性介质，其至少在其一个表面上具有分散在粘合剂中的铁磁粉末的磁性层，其中研磨突起和非研磨突起的高度和现有密度 在磁性层的表面上限定在特定范围内。 磁记录介质具有优异的电磁特性，磁头耐磨性和运行耐久性。

公开(公告)号：US5447782A

公开(公告)日：1995-09-05

申请号：US143063

申请日：1993-10-29

申请人： Hiroo Inaba ,  Kiyomi Ejiri ,  Koji Naoe

发明人： Hiroo Inaba ,  Kiyomi Ejiri ,  Koji Naoe

IPC分类号： C09D5/23 ,  G11B5/70 ,  G11B5/716 ,  G11B5/73 ,  G11B5/738 ,  G11B5/00

CPC分类号： G11B5/70 ,  G11B5/716 ,  G11B5/738 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/2495 ,  Y10T428/24967 ,  Y10T428/256 ,  Y10T428/257

摘要： Disclosed is a magnetic recording medium, comprising (a) a nonmagnetic flexible support, (b) a lower nonmagnetic layer provided on the support and comprising a nonmagnetic particle and a binder, and (c) a magnetic layer provided on the nonmagnetic layer and comprising a ferromagnetic particle and a binder, wherein (i) the magnetic layer comprises at least two layers comprising a lower magnetic layer provided on the lower nonmagnetic layer and an upper magnetic layer provided on the lower magnetic layer, (ii) a ratio of the lower nonmagnetic layer thickness to the total magnetic layer thickness of the lower magnetic layer and the upper magnetic layer is from 1 to 50, (iii) the upper magnetic layer and the lower magnetic layer have a difference in coercive force of at least 80 Oe, and (iv) the lower nonmagnetic layer and at least the lower magnetic layer are formed by a wet-on-wet coating method.

摘要翻译： 公开了一种磁记录介质，包括（a）非磁性柔性支撑体，（b）设置在载体上的下部非磁性层，并且包括非磁性颗粒和粘合剂，和（c）设置在非磁性层上的磁性层， 铁磁颗粒和粘合剂，其中（i）磁性层包括至少两层，包括设置在下部非磁性层上的下部磁性层和设置在下部磁性层上的上部磁性层，（ii）下部磁性层的比例 非磁性层厚度与下部磁性层和上部磁性层的总磁性层厚度的比值为1〜50，（iii）上部磁性层和下部磁性层的矫顽力差异至少为80 Oe， （iv）下部非磁性层和至少下部磁性层通过湿式湿式涂覆法形成。

公开(公告)号：US06548160B2

公开(公告)日：2003-04-15

申请号：US09728308

申请日：2000-12-01

申请人： Koji Naoe ,  Kiyomi Ejiri

发明人： Koji Naoe ,  Kiyomi Ejiri

IPC分类号： G11B5708

CPC分类号： G11B5/708 ,  Y10T428/256 ,  Y10T428/265

摘要： The present invention aims to provide a magnetic recording medium capable of high-density recording with excellent running durability and preservability as well as a magnetic recording medium capable of high-density recording with low noise even at high output and excellent running durability. Disclosed are a magnetic recording medium comprises a magnetic layer containing a ferromagnetic powder and a binder provided on a nonmagnetic flexible substrate and a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder provided in this order on a nonmagnetic flexible substrate. Provided that said magnetic layer contains a zirconia powder having an average primary particle diameter of 0.005-0.2 &mgr;m, or said magnetic layer has an average thickness in the range of 0.04-0.3 &mgr;m, said ferromagnetic powder is a metal alloy powder having a as of 130 A.m2/kg or more, and said magnetic layer contains a granulated powder having an average primary particle diameter of 0.005-0.2 &mgr;m and a specific gravity of 5 or more.

摘要翻译： 本发明的目的是提供一种具有优异的运行耐久性和保存性的高密度记录的磁记录介质以及即使在高输出下也能够以低噪声进行高密度记录的磁记录介质和优异的运行耐久性。 磁记录介质包括含有铁磁性粉末和设置在非磁性柔性基板上的粘合剂的磁性层和包含非磁性粉末和粘合剂的非磁性层的磁记录介质和含有铁磁粉末和粘结剂的磁性层 订购非磁性柔性基板。 假设所述磁性层含有平均一次粒径为0.005-0.2μm的氧化锆粉末，或者所述磁性层的平均厚度在0.04-0.3μm的范围内，所述铁磁性粉末是具有 130Am 2 / kg以上，所述磁性层含有平均一次粒径为0.005〜0.2μm，比重为5以上的造粒粉末。

公开(公告)号：US06479131B1

公开(公告)日：2002-11-12

申请号：US09596345

申请日：2000-06-19

申请人： Kiyomi Ejiri ,  Koji Naoe ,  Masahiko Mori

发明人： Kiyomi Ejiri ,  Koji Naoe ,  Masahiko Mori

IPC分类号： G11B5733

CPC分类号： G11B5/738 ,  Y10T428/24355 ,  Y10T428/2495 ,  Y10T428/25 ,  Y10T428/265 ,  Y10T428/2982

摘要： Disclosed is a magnetic recording medium exhibiting a high C/N ratio in high-density magnetic recording. The magnetic recording medium has, on a flexible nonmagnetic support, at least a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder on the nonmagnetic layer, where the magnetic layer has an average thickness d in the range of from 0.01 to 0.3 &mgr;m, said nonmagnetic powder has an acicular shape, and the ratio of a mean length L of the major axis of the nonmagnetic powder to an average thickness D of said nonmagnetic layer satisfies the relationship of 1/10≦L/D≦2.

摘要翻译： 公开了在高密度磁记录中表现出高C / N比的磁记录介质。 磁性记录介质在柔性非磁性载体上至少包含非磁性粉末和粘合剂的非磁性层和在非磁性层上含有铁磁粉末和粘合剂的磁性层，其中磁性层的平均厚度d在 0.01〜0.3μm的范围，所述非磁性粉末具有针状，非磁性粉末的长轴的平均长度L与所述非磁性层的平均厚度D的比例满足1/10 < = L / D <= 2。

公开(公告)号：US06475598B1

公开(公告)日：2002-11-05

申请号：US09602225

申请日：2000-06-23

申请人： Koji Naoe ,  Kiyomi Ejiri ,  Masahiko Mori

发明人： Koji Naoe ,  Kiyomi Ejiri ,  Masahiko Mori

IPC分类号： G11B568

CPC分类号： B82Y15/00 ,  G11B5/7085 ,  G11B5/7305 ,  G11B5/738 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/24975 ,  Y10T428/25 ,  Y10T428/265

摘要： The present invention provides a magnetic recording medium exhibiting a high C/N ratio as well as having excellent running durability even under high-density magnetic recording. Disclosed is a magnetic recording medium comprising, on either side of a flexible nonmagnetic support, a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order, having an average thickness of said magnetic layer of from 0.01 to 0.3 &mgr;m and a total average thickness of said magnetic layer and said nonmagnetic layer of from 0.1 to 1.0 &mgr;m, characterized in that the number of projections having a height equal to or higher than 20 nm on the magnetic layer surface measured with AFM (Atomic Force Microscope) is equal to or less than 100 pieces per 30 &mgr;m×30 &mgr;m square as well as the PSD (Power Spectrum Density) of the magnetic layer surface measured with the AFM is equal to or less than 0.2 nm2 in the wavelength of from of 1 to 5 &mgr;m.

摘要翻译： 本发明提供了一种表现出高C / N比的磁记录介质，并且即使在高密度磁记录下也具有优异的运行耐久性。公开了一种磁记录介质，其在柔性非磁性载体的任一侧上包含非磁性层 含有非磁性粉末和粘合剂以及含有铁磁性粉末和粘合剂的磁性层，所述磁性层的平均厚度为0.01〜0.3μm，所述磁性层和所述非磁性层的总平均厚度为 0.1〜1.0μm，其特征在于，使用AFM（原子力显微镜）测定的磁性层表面上的高度等于或大于20nm的突起的数量等于或小于每30mum×30μm的正方形100个 以及用AFM测量的磁性层表面的PSD（功率谱密度）在1至5的波长中等于或小于0.2nm 2 妈妈

公开(公告)号：US6074724A

公开(公告)日：2000-06-13

申请号：US918864

申请日：1997-08-26

申请人： Hiroo Inaba ,  Kiyomi Ejiri ,  Masaki Suzuki ,  Koji Naoe ,  Yuichiro Murayama ,  Hiroaki Takano

发明人： Hiroo Inaba ,  Kiyomi Ejiri ,  Masaki Suzuki ,  Koji Naoe ,  Yuichiro Murayama ,  Hiroaki Takano

IPC分类号： G11B5/702 ,  G11B5/706

CPC分类号： B82Y15/00 ,  G11B5/7021 ,  G11B5/7022 ,  G11B5/70621 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/257 ,  Y10T428/265

摘要： A magnetic recording medium is disclosed, which comprises a support having thereon a magnetic layer comprising a binder and a ferromagnetic powder dispersed therein, wherein said binder comprises a polyurethane resin having at least one cyclic hydrocarbon group and at least one ether linkage, and said ferromagnetic powder is a ferromagnetic metallic powder which comprises Fe and has a mean major-axis length of from 0.05 to 0.19 .mu.m and a crystallite size of from 100 to 230 .ANG.; and further a magnetic recording medium is disclosed, comprising a support having thereon in succession an undercoat layer comprising a binder U and an inorganic powder dispersed therein and a magnetic layer comprising a binder M and a ferromagnetic powder dispersed therein, wherein at least either of the binder U or M comprises a polyurethane resin having at least one cyclic hydrocarbon group and at least one ether linkage and said ferromagnetic powder is a ferromagnetic metallic powder which comprises Fe and has a mean major-axis length of from 0.05 to 0.19 .mu.m and a crystallite size of from 100 to 230 .ANG..

摘要翻译： 公开了一种磁记录介质，其包括其上具有包含粘合剂和分散在其中的铁磁粉末的磁性层的载体，其中所述粘合剂包含具有至少一个环状烃基和至少一个醚键的聚氨酯树脂，并且所述铁磁性 粉末是含铁的铁磁性金属粉末，其平均长轴长度为0.05至0.19μm，微晶尺寸为100至230安培; 并且还公开了一种磁记录介质，包括其上连续地具有包含粘合剂U和分散在其中的无机粉末的底涂层的支撑体和包含粘合剂M和分散在其中的铁磁性粉末的磁性层，其中， 粘合剂U或M包含具有至少一个环状烃基和至少一个醚键的聚氨酯树脂，并且所述铁磁性粉末是包含Fe并且具有0.05至0.19μm的平均长轴长度的铁磁性金属粉末，以及 微晶尺寸为100至230安培。

公开(公告)号：US5955189A

公开(公告)日：1999-09-21

申请号：US773512

申请日：1996-12-23

申请人： Kiyomi Ejiri ,  Koji Naoe

发明人： Kiyomi Ejiri ,  Koji Naoe

IPC分类号： G11B5/706 ,  G11B5/708 ,  G11B5/714

CPC分类号： G11B5/7085 ,  G11B5/70621 ,  G11B5/708 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/258 ,  Y10T428/259 ,  Y10T428/265

摘要： A magnetic recording medium includes at least one magnetic layer formed by dispersing a ferromagnetic powder in a binder, the ferromagnetic powder including at least one kind of rare earth metal element selected from Y or metal elements of lanthanide series and being constituted of acicular ferromagnetic alloy powder particles whose .sigma. s is in the range of 120 to 160 emu/g, whose average longitudinal axis length is in the range of 0.04 to 0.2 .mu.m and whose crystallite size is in the range of 100 to 300 angstroms, the magnetic layer including an abrasive agent whose average particle diameter is in the range of 0.03 to 0.3 .mu.m and containing carbon black having an average particle diameter of 50 to 300 m.mu.. The magnetic recording medium has an excellent electromagnetic conversion characteristics and, particularly, a good preservation capability and can prevent a magnetic head from being abraded.

摘要翻译： 磁记录介质包括通过将铁磁粉末分散在粘合剂中形成的至少一个磁性层，所述铁磁粉末包括选自Y或稀土金属元素中的至少一种稀土金属元素或镧系金属元素，并由针状铁磁合金粉末 其sigma在120〜160emu / g的范围内，其平均纵轴长度在0.04〜0.2μm的范围内，其微晶尺寸在100〜300埃的范围内，所述磁性层包括 研磨剂的平均粒径在0.03〜0.3μm的范围内，并且含有平均粒径为50〜300μm的碳黑。 磁记录介质具有优异的电磁转换特性，特别是具有良好的保存能力并且可以防止磁头被磨损。

公开(公告)号：US06203934B1

公开(公告)日：2001-03-20

申请号：US09169189

申请日：1998-10-08

申请人： Koji Naoe ,  Kiyomi Ejiri ,  Naoto Abe

发明人： Koji Naoe ,  Kiyomi Ejiri ,  Naoto Abe

IPC分类号： G11B566

CPC分类号： G11B5/738 ,  G11B5/70 ,  G11B5/70621

摘要： A magnetic recording medium is described, which comprises a support having thereon a magnetic layer comprising a ferromagnetic metal powder and a binder resin, wherein the coercive force (Hc) of the magnetic layer is from 2,100 to 3,000 Oe, SFD (switching field distribution) of the magnetic layer is 0.30 or less, and an average thickness: d of the magnetic layer is in the range of: d≦ recording wavelength &lgr;/4.

摘要翻译： 描述了一种磁记录介质，其包括其上具有包含铁磁性金属粉末和粘合剂树脂的磁性层的支撑体，其中磁性层的矫顽力（Hc）为2100〜3000Oe，SFD（切换场分布） 的磁性层的平均厚度d在以下的范围内：d <=记录波长lambd / 4。

公开(公告)号：US06602576B2

公开(公告)日：2003-08-05

申请号：US09798807

申请日：2001-03-02

申请人： Koji Naoe ,  Kiyomi Ejiri

发明人： Koji Naoe ,  Kiyomi Ejiri

IPC分类号： G11B566

CPC分类号： G11B5/738 ,  G11B5/70 ,  G11B5/7021 ,  G11B5/70621 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/24942 ,  Y10T428/24975 ,  Y10T428/265 ,  Y10T428/31609

摘要： The present invention aims to provide a magnetic recording medium for digital recording/reproducing systems having a small bit area, i.e. a short recording wavelength and a narrow track width, which is a particulate magnetic recording medium showing good electromagnetic characteristics. A magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder provided in this order on a nonmagnetic substrate wherein said magnetic layer has an average thickness of 0.01-0.1 &mgr;m and the ratio of the area of magnetic recording defects generated upon magnetic development after recording at the shortest recording wavelength to the total magnetic recording area is 0.2-20%.

摘要翻译： 本发明的目的是提供一种用于数字记录/再现系统的磁记录介质，其具有小的位面积，即短记录波长和窄轨迹宽度，其是表现出良好电磁特性的微粒磁记录介质。 包含非磁性粉末和粘合剂的非磁性层和含有铁磁性粉末和粘合剂的磁性层按顺序设置在非磁性基材上，其中所述磁性层的平均厚度为0.01-0.1μm，磁性区域的比例 在以最短记录波长记录到总磁记录面积之后，在磁性显影时产生的记录缺陷为0.2-20％。

公开(公告)号：US06582815B2

公开(公告)日：2003-06-24

申请号：US10081093

申请日：2002-02-21

申请人： Koji Naoe ,  Kiyomi Ejiri

发明人： Koji Naoe ,  Kiyomi Ejiri

IPC分类号： G11B5708

CPC分类号： G11B5/708 ,  G11B5/714 ,  G11B5/842 ,  Y10T428/1164 ,  Y10T428/256 ,  Y10T428/265

摘要： Provided is a magnetic recording medium suitable for high density digital recording, in detail, a magnetic recording medium suitable for reproduction with an MR head. A magnetic recording medium comprising a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic metal powder, a binder and a nonmagnetic powder provided in this order on a flexible nonmagnetic support. Said magnetic layer has an average thickness ranging from 0.01 to 0.2 &mgr;m, said ferromagnetic metal powder has a mean major axis length of less than 100 nm and a mean minor axis length of less than 20 nm, said nonmagnetic powder comprised in the magnetic layer is a granular or acicular nonmagnetic powder, the ratio of the mean particle size or minor axis length of said nonmagnetic powder to said mean minor axis length is higher than 0.2 and equal to or less than 2.5, and the maximum surface area of magnetic pinholes is equal to or less than 50% of a bit surface area.