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1. 发明授权

US06497948B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06497948B2
公开(公告)日：2002-12-24
申请号：US09821496
申请日：2001-03-29
申请人： Kiyomi Ejiri , Masahiko Mori
发明人： Kiyomi Ejiri , Masahiko Mori
IPC分类号： G11B5706
CPC分类号： G11B5/714 , G11B5/738 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/265
摘要： The present invention aims to provide a particulate magnetic recording medium showing a high C/N in high-density magnetic recording (especially using an MR head for reproducing). Herein disclosed is a magnetic recording medium comprising a lower layer containing a nonmagnetic powder and a binder provided on a nonmagnetic flexible substrate and a magnetic layer containing a ferromagnetic powder and a binder provided thereon wherein said magnetic layer has an average thickness d of 0.01-0.1 &mgr;m, the ferromagnetic powder contained in said magnetic layer is an acicular ferromagnetic alloy powder having an average major axis length of 0.1 &mgr;m or less and a as of 120 A.m2/kg (120 emu/g) or less, the nonmagnetic powder contained in said lower layer is an acicular inorganic powder having an average major axis length of 0.15 &mgr;m or less, and said ferromagnetic powder has an aspect ratio equal to or smaller than the aspect ratio of said acicular inorganic powder.
摘要翻译：本发明的目的在于提供一种在高密度磁记录（特别是使用用于再现的MR磁头）中具有高C / N的微粒磁记录介质。此外，公开了一种磁记录介质，其包含含有非磁性粉末和提供在非磁性柔性基板上的粘合剂和含有铁磁粉末和粘合剂的磁性层，其中所述磁性层的平均厚度d为0.01-0.1μm，所述磁性层中所含的铁磁性粉末是具有平均长轴长度为0.1μm以下，a为120A·m 2 / kg（120emu / g）以下，所述下层中所含的非磁性粉末为平均长轴长度为0.15的针状无机粉末所述铁磁粉末的纵横比等于或小于所述针状无机粉末的纵横比。

2. 发明授权

US06558772B2 Magnetic recording medium and method of manufacturing same 失效
公开(公告)号：US06558772B2
公开(公告)日：2003-05-06
申请号：US09885558
申请日：2001-06-20
申请人： Kiyomi Ejiri , Masahiko Mori
发明人： Kiyomi Ejiri , Masahiko Mori
IPC分类号： G11B5712
CPC分类号： G11B5/714 , G11B5/70678 , G11B5/842 , G11B5/855 , Y10T428/24355 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： Enclosed is a magnetic recording medium obtained by sequentially providing on a flexible nonmagnetic support a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder. The thickness of the magnetic layer is 0.01-0.1 &mgr;m and the ratio of the exposed area of nonmagnetic power on the surface of the magnetic layer is not greater than 10 percent. A method of manufacturing a magnetic recording medium comprising coating a nonmagnetic layer coating liquid on a flexible nonmagnetic support and applying a magnetic layer coating liquid on the coated layer while the coated layer is still wet. The ratio of the exposed area of nonmagnetic power on the surface of the magnetic layer is not greater than 10 percent; the nonmagnetic layer coating liquid has a yield stress of not less than 100 &mgr;N/cm2 or 10 dyne/cm2 and the solid component concentration of the magnetic layer coating liquid is greater than the solid component concentration of the nonmagnetic layer coating liquid. A particulate magnetic recording medium having a magnetic layer of not greater than 0.1 &mgr;m, good production properties, and good electromagnetic characteristics when used with MR heads is provided.

3. 发明授权

US06905753B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06905753B2
公开(公告)日：2005-06-14
申请号：US09943229
申请日：2001-08-30
申请人： Masahiko Mori , Kiyomi Ejiri
发明人： Masahiko Mori , Kiyomi Ejiri
IPC分类号： G11B5/70 , G11B5/706 , G11B5/708 , G11B5/714 , H01F1/047
CPC分类号： G11B5/7085 , G11B5/714 , Y10T428/24355 , Y10T428/256 , Y10T428/265
摘要： Provided is a particulate magnetic recording medium having good durability and a high C/N ratio in high-density magnetic recording (particularly when employing an MR head for reproduction). A magnetic recording medium which comprises a lower layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder, an abrasive and a binder provided in this order on a nonmagnetic flexible support. The magnetic layer has a mean thickness d ranging from 0.01 to 0.1 μm, the ferromagnetic powder contained in the magnetic layer is an acicular ferromagnetic alloy powder having the mean major axis length equal to or less than 0.1 μm and the saturation magnetization σs equal to or less than 120 A·m2/kg, and the number of abrasive protrusions ranging in height from 5 to 10 nm on the surface of the magnetic layer ranges from 15 to 25/225 μm2.
摘要翻译：提供了一种在高密度磁记录中（特别是当使用用于再现的MR磁头）时具有良好的耐久性和高C / N比的颗粒状磁记录介质。一种磁记录介质，其包括由非磁性粉末和粘合剂构成的下层，以及包含铁磁性粉末，研磨剂和粘合剂的磁性层，该磁性层按顺序设置在非磁性柔性载体上。磁性层的平均厚度d为0.01〜0.1μm，磁性层中含有的铁磁性粉末为平均长轴长度等于或小于0.1μm的针状铁磁性合金粉末，饱和磁化强度等于或等于小于120Am 2 / kg，在磁性层表面上的高度为5〜10nm的研磨性突起的数量为15〜25 /225μm2， SUP>。

4. 发明授权

US06479131B1 Magnetic recording medium 有权
标题翻译：磁记录介质
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。

5. 发明授权

US06475598B1 Magnetic recording medium 有权
标题翻译：磁记录介质
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

6. 发明授权

US06773788B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06773788B2
公开(公告)日：2004-08-10
申请号：US10216849
申请日：2002-08-13
申请人： Masahiko Mori , Kiyomi Ejiri
发明人： Masahiko Mori , Kiyomi Ejiri
IPC分类号： G11B5706
CPC分类号： G11B5/70 , G11B5/70678 , G11B5/842 , Y10T428/257 , Y10T428/265
摘要： Provided is a magnetic recording medium exhibiting high C/N ratio and suited to high-density magnetic recording, particularly, to reproduction with MR heads. The magnetic recording medium comprises a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a flexible nonmagnetic support. The magnetic layer has an average thickness ranging from 0.02 to 0.2 &mgr;m, the ferromagnetic powder contained in the magnetic layer is a plate-shaped hexagonal ferrite ferromagnetic powder having an average plate diameter of 10 to 40 nm, the ratio of a volume of magnetic reversal to a volume of magnetic material particles is equal to or less than 3, the magnetic layer has a coercive force Hc equal to or higher than 159 kA/m, and components magnetically reversing in the magnetic field of 80 kA/m or less are less than 1 percent in the magnetization distribution of the magnetic layer.
摘要翻译：本发明提供一种表现出高C / N比且适于高密度磁记录的磁记录介质，特别是用MR磁头再现。磁性记录介质在柔性非磁性载体上依次包括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。磁性层的平均厚度为0.02〜0.2μm，磁性层所含的铁磁性粉末为板状六方铁素体铁磁粉末，平均板直径为10〜40nm，磁性反转体积的比例相对于一定体积的磁性材料粒子为3以下，磁性层的矫顽力Hc为159kA / m以上，在磁性方面为80kA / m以下的磁性反转成分较小超过1％的磁性层的磁化分布。

7. 发明授权

US06482506B1 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US06482506B1
公开(公告)日：2002-11-19
申请号：US09648823
申请日：2000-08-25
申请人： Kiyomi Ejiri , Masahiko Mori
发明人： Kiyomi Ejiri , Masahiko Mori
IPC分类号： G11B5716
CPC分类号： G11B5/716 , Y10S428/90 , Y10T428/24942 , Y10T428/24975 , Y10T428/25 , Y10T428/256 , Y10T428/257
摘要： Provided is a particulate magnetic recording medium having excellent electromagnetic characteristics, especially, a particulate magnetic recording medium which achieves a high output and a low noise and which is suitable for reproduction with an MR head. A magnetic recording medium comprising a flexible nonmagnetic support having thereon, in order, a nonmagnetic layer containing a nonmagnetic powder and a binder and at least two magnetic layers including an uppermost magnetic layer and a lowermost magnetic layer, each containing a ferromagnetic powder and a binder, wherein said at least two magnetic layers have a total thickness of from 0.02 &mgr;m to 0.5 &mgr;m and an average particle volume V(u) and a saturation magnetization &sgr;s(u) of a ferromagnetic powder in said uppermost magnetic layer are, respectively, higher than an average particle volume V(L) and a saturation magnetization &sgr;s(L) of a ferromagnetic powder in said lowermost magnetic layer.
摘要翻译：本发明提供一种具有优异电磁特性的微粒磁记录介质，特别是实现高输出和低噪声的微粒磁记录介质，适用于MR磁头再现。一种磁记录介质，包括其上具有柔性非磁性载体按顺序，包含非磁性粉末和粘合剂的非磁性层和包含最高磁性层和最低磁性层的至少两个磁性层，每个磁性层都含有铁磁性粉末和粘合剂，其中所述至少两个磁性层具有总共所述最高磁性层中的铁磁性粉末的平均粒子体积V（u）和饱和磁化强度s（u）分别高于平均粒子体积V（L）和所述最低磁性层中的铁磁粉末的饱和磁化强度（L）。

8. 发明授权

US06521361B2 Magnetic recording medium having specified acicular ratio relationship between non-magnetic and ferromagnetic particles 有权
标题翻译：具有非磁性和铁磁性颗粒之间具有特定针状比关系的磁记录介质
公开(公告)号：US06521361B2
公开(公告)日：2003-02-18
申请号：US09828767
申请日：2001-04-09
申请人： Kiyomi Ejiri , Masahiko Mori
发明人： Kiyomi Ejiri , Masahiko Mori
IPC分类号： B32B516
CPC分类号： G11B5/70678 , G11B5/733
摘要： A magnetic recording medium having on a flexible, nonmagnetic support, in order, a lower layer comprising a nonmagnetic powder and a binder, and a magnetic layer comprising a ferromagnetic powder and a binder. The average thickness d of the magnetic layer is 0.02-0.2 &mgr;m. The ferromagnetic powder contained in the magnetic layer is a platelike hexagonal ferrite magnetic powder with a mean plate diameter of not more than 40 nm. The nonmagnetic powder contained in the lower layer is an acicular inorganic powder with a mean main axis length of not more than 0.2 &mgr;m. Further, the plate ratio of the ferromagnetic powder is not greater than the acicular ratio of the lower layer inorganic powder. A particulate magnetic recording material exhibiting a high C/N in high-density magnetic recording, particularly in reproduction with MR heads is provided.
摘要翻译：一种磁性记录介质，其具有柔性非磁性载体，依次包含非磁性粉末和粘合剂的下层，以及包含铁磁性粉末和粘合剂的磁性层。磁性层的平均厚度d为0.02-0.2μm。包含在磁性层中的铁磁性粉末是平板直径不大于40nm的板状六角铁氧体磁性粉末。包含在下层中的非磁性粉末是平均主轴长度不大于0.2μm的针状无机粉末。此外，铁磁粉末的板比不大于下层无机粉末的针状比。提供了在高密度磁记录中表现出高C / N的微粒磁记录材料，特别是在具有MR磁头的再现中。

9. 发明授权

US07352528B2 Leader tape and magnetic tape cartridge using the same 有权
标题翻译：领带和磁带使用相同
公开(公告)号：US07352528B2
公开(公告)日：2008-04-01
申请号：US11084049
申请日：2005-03-21
申请人： Kiyomi Ejiri
发明人： Kiyomi Ejiri
IPC分类号： G11B5/78
CPC分类号： G11B5/627 , G11B23/107
摘要： A leader tape comprising a support and a coating layer containing a powder and a binder, wherein at least one surface of the leader tape has a center line average roughness (Ra) of from 10 to 60 nm, and the leader tape has a cupping of from 0 to 1 mm per a width of ½ inch.
摘要翻译：一种引导带，其包括支撑体和包含粉末和粘合剂的涂层，其中引导带的至少一个表面具有10至60nm的中心线平均粗糙度（Ra），并且引导带具有杯形每½英寸的宽度为0至1毫米。

10. 发明申请

US20050264935A1 Information recording tape 审中-公开
标题翻译：信息录像带
公开(公告)号：US20050264935A1
公开(公告)日：2005-12-01
申请号：US11138351
申请日：2005-05-27
申请人： Minoru Sueki , Kiyomi Ejiri
发明人： Minoru Sueki , Kiyomi Ejiri
IPC分类号： G11B5/70 , G11B5/74 , G11B5/78
CPC分类号： G11B5/78 , G11B5/70
摘要： An information recording tape including a data-recording area and a non-data-recording area, with the data-recording area having a center-line average surface roughness Ra smaller than 3 nm and at most 100/mm2 of protuberances standing at least 20 nm high, and with the non-data-recording area having a center-line average surface roughness Ra greater than 2 nm and more than 100/mm2 of protuberances standing at least 20 nm high.
摘要翻译：一种包括数据记录区和非数据记录区的信息记录带，数据记录区具有小于3nm且至多100 / mm 2的中心线平均表面粗糙度Ra，其中非线性平均表面粗糙度Ra大于2nm，超过100 / mm 2的突起突出部位的非数据记录区域至少20nm高。

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