公开(公告)号：US06680088B2

公开(公告)日：2004-01-20

申请号：US10151998

申请日：2002-05-22

申请人： Koji Naoe ,  Hiroyuki Kobayashi

发明人： Koji Naoe ,  Hiroyuki Kobayashi

IPC分类号： B05D300

CPC分类号： G11B5/842

摘要： A process for producing a magnetic recording medium is provided in which a magnetic layer including a ferromagnetic powder and a binder is provided on a non-magnetic flexible support. In the process, a magnetic liquid containing mainly a ferromagnetic powder and a binder, and an abrasive liquid paste including an abrasive and a binder are prepared separately, and the abrasive liquid paste is subsequently subjected to an ultrasonic dispersion treatment and then mixed with the magnetic liquid to prepare a magnetic coating solution for the magnetic layer.

摘要翻译： 提供了一种用于制造磁记录介质的方法，其中在非磁性柔性支撑件上设置包括铁磁性粉末和粘合剂的磁性层。 在此过程中，分别制备主要含有铁磁性粉末和粘合剂的磁性液体，以及包含研磨剂和粘合剂的研磨液体糊剂，然后对研磨液糊进行超声波分散处理，然后与磁性混合 液体以制备用于磁性层的磁性涂层溶液。

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：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.

公开(公告)号：US06534168B2

公开(公告)日：2003-03-18

申请号：US09938400

申请日：2001-08-23

申请人： Koji Naoe ,  Kiyomi Ejiri

发明人： Koji Naoe ,  Kiyomi Ejiri

IPC分类号： B32B516

CPC分类号： G11B5/738 ,  Y10S428/90 ,  Y10T428/257

摘要： Provided is a magnetic recording medium exhibiting a high C/N (low noise) ratio in high-density magnetic recording. A magnetic recording medium which comprises a nonmagnetic lower layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder provided in this order on a flexible nonmagnetic support. The nonmagnetic lower layer comprises flat acicular &agr;-iron oxide powder with a major axis length ranging from 0.05 to 0.5 &mgr;m and a ratio of the major width to the minor width (major width/minor width) of the minor axis cross-section when sectioned at an angle perpendicular to the major axis is equal to or higher than 1. The granular nonmagnetic particles have a mean particle diameter equal to or less than 0.04 &mgr;m.

摘要翻译： 提供了一种在高密度磁记录中表现出高C / N（低噪声）比的磁记录介质。 一种磁记录介质，其包括非磁性粉末和粘合剂的非磁性下层和包含铁磁性粉末和粘合剂的磁性层，该磁性层按顺序设置在柔性非磁性载体上。 非磁性下层包括长轴长度为0.05-0.5μm的扁平针状α-氧化铁粉末，当切断时短轴截面的主宽度与较小宽度（主宽度/次宽度）的比率 垂直于长轴的角度等于或大于1.颗粒状非磁性颗粒的平均粒径等于或小于0.04μm。

公开(公告)号：US06428884B1

公开(公告)日：2002-08-06

申请号：US09602353

申请日：2000-06-23

申请人： Koji Naoe ,  Kiyomi Ejiri

发明人： Koji Naoe ,  Kiyomi Ejiri

IPC分类号： G11B5714

CPC分类号： G11B5/714 ,  G11B5/70 ,  G11B5/70621 ,  Y10T428/25 ,  Y10T428/265 ,  Y10T428/2982 ,  Y10T428/31609

摘要： Described is a magnetic recording medium comprising, on 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. The average thickness, d, of the magnetic layer is from 0.01 to 0.3 &mgr;m, and the average particle number, m, of the ferromagnetic powder existing in the magnetic layer thickness direction is in the range of 1 to 20.

摘要翻译： 描述了一种磁性记录介质，其在柔性非磁性载体上包含依次包含非磁性粉末和粘合剂的非磁性层和含有铁磁粉末和粘合剂的磁性层。 磁性层的平均厚度d为0.01〜0.3μm，磁性层厚度方向上存在的铁磁性粉末的平均粒子数m为1〜20。

公开(公告)号：US06372325B1

公开(公告)日：2002-04-16

申请号：US09524757

申请日：2000-03-13

申请人： Kiyomi Ejiri ,  Koji Naoe ,  Masatoshi Takahashi

发明人： Kiyomi Ejiri ,  Koji Naoe ,  Masatoshi Takahashi

IPC分类号： G11B568

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

摘要： Disclosed is a magnetic recording medium having a flexible nonmagnetic support, a nonmagnetic layer containing a nonmagnetic powder and a binder on the support, and a magnetic layer containing a ferromagnetic powder and a binder. The magnetic layer has an average thickness d of 0.01 to 0.3 &mgr;m, a ratio &sgr;/d of a standard deviation &sgr; in the thickness of the magnetic layer to the average thickness d equal to or less than 0.5, and, according to the roughness spectrum of a magnetic layer surface measured with an atomic force microscope, a PSD of 0.5 nm2 or lower in a wavelength of 1 to 5 &mgr;m and a PSD of 0.02 to 0.5 nm2 in a wavelength of 0.5 &mgr;m or more to less than 1 &mgr;m.

摘要翻译： 公开了一种具有柔性非磁性载体，在载体上含有非磁性粉末和粘合剂的非磁性层以及含有铁磁粉末和粘合剂的磁性层的磁记录介质。 磁性层的平均厚度d为0.01〜0.3μm，磁性层的厚度的标准偏差σ与平均厚度d的比值σ/ d等于或小于0.5，根据粗糙度谱 使用原子力显微镜测量的磁性层表面，波长为1-5μm的0.5nm2以下的PSD，波长为0.5μm以上且小于1μm的PSD为0.02〜0.5nm 2。

公开(公告)号：US5480716A

公开(公告)日：1996-01-02

申请号：US262843

申请日：1994-06-21

申请人： Koji Naoe ,  Kiyomi Ejiri

发明人： Koji Naoe ,  Kiyomi Ejiri

IPC分类号： B22F1/00 ,  C09D5/23 ,  G11B5/706 ,  G11B5/712 ,  G11B5/73 ,  H01F1/06 ,  G11B5/00

CPC分类号： G11B5/70621 ,  G11B5/712 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/27 ,  Y10T428/2991

摘要： A magnetic recording medium is disclosed which includes a magnetic layer containing ferromagnetic metal particles containing Al in an amount of 0.5 to 6% by weight per the total weight of metal components contained in the ferromagnetic metal particles, the ferromagnetic metal particles having the surfaces thereof coated with a compound or compounds of formula (1) or (2), as described herein. The magnetic recording medium has reduced abrasion with respect to magnetic heads and does not cause magnetic head fouling even under low humidity conditions.

摘要翻译： 公开了一种磁记录介质，其包括含铁磁金属颗粒的磁性层，所述铁磁金属颗粒含有铁含量为铁磁性金属颗粒中所含金属组分总重量的0.5至6重量％的Al，其表面涂覆有强磁性金属颗粒 与式（1）或（2）的化合物或化合物反应。 磁记录介质相对于磁头具有减少的磨损，即使在低湿度条件下也不会引起磁头结垢。