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21. 发明授权

US5985408A Magnetic recording medium 失效
公开(公告)号：US5985408A
公开(公告)日：1999-11-16
申请号：US846160
申请日：1997-04-25
申请人： Kiyomi Ejiri , Hiroo Inaba , Shinji Saito , Satoru Hayakawa
发明人： Kiyomi Ejiri , Hiroo Inaba , Shinji Saito , Satoru Hayakawa
IPC分类号： G11B5/66 , G11B5/70 , G11B5/716 , G11B5/733 , G11B5/738 , G11B5/842 , G11B5/848
CPC分类号： G11B5/848 , G11B5/70 , G11B5/716 , G11B5/733 , G11B5/738 , G11B5/842 , Y10S428/90 , Y10T428/12472 , Y10T428/24355 , Y10T428/24942 , Y10T428/25 , Y10T428/253 , Y10T428/256 , Y10T428/257 , Y10T428/258 , Y10T428/259 , Y10T428/265 , Y10T428/269 , Y10T428/31551 , Y10T428/31721 , Y10T428/31855
摘要： A magnetic recording medium is disclosed, comprising a non-magnetic support having provided thereon at least a lower non-magnetic layer comprising a binder having dispersed therein a non-magnetic powder and an upper magnetic layer comprising a binder having dispersed therein a ferromagnetic powder which has been coated on said lower non-magnetic layer while the lower non-magnetic layer is wet, wherein the upper magnetic layer has an average dry thickness (d) of not more than 1.0 .mu.m and an average thickness variation (.sup..DELTA. d) at the interface between the upper magnetic layer and lower non-magnetic layer is not more than d/2. The magnetic recording medium exhibits excellent electromagnetic characteristics, running properties, and durability.

22. 发明授权

US5811172A Magnetic recording medium 失效
公开(公告)号：US5811172A
公开(公告)日：1998-09-22
申请号：US845536
申请日：1997-04-25
申请人： Kiyomi Ejiri , Hiroo Inaba , Shinji Saito , Satoru Hayakawa
发明人： Kiyomi Ejiri , Hiroo Inaba , Shinji Saito , Satoru Hayakawa
IPC分类号： G11B5/66 , G11B5/70 , G11B5/716 , G11B5/733 , G11B5/738 , G11B5/842 , G11B5/848 , B32B3/10
CPC分类号： G11B5/848 , G11B5/70 , G11B5/716 , G11B5/733 , G11B5/738 , G11B5/842 , Y10S428/90 , Y10T428/12472 , Y10T428/24355 , Y10T428/24942 , Y10T428/25 , Y10T428/253 , Y10T428/256 , Y10T428/257 , Y10T428/258 , Y10T428/259 , Y10T428/265 , Y10T428/269 , Y10T428/31551 , Y10T428/31721 , Y10T428/31855
摘要： A magnetic recording medium is disclosed, comprising a non-magnetic support having provided thereon at least a lower non-magnetic layer comprising a binder having dispersed therein a non-magnetic powder and an upper magnetic layer comprising a binder having dispersed therein a ferromagnetic powder which has been coated on said lower non-magnetic layer while the lower non-magnetic layer is wet, wherein the upper magnetic layer has an average dry thickness (d) of not more than 1.0 .mu.m and an average thickness variation (.sup..DELTA. d) at the interface between the upper magnetic layer and lower non-magnetic layer is not more than d/2. The magnetic recording medium exhibits excellent electromagnetic characteristics, running properties, and durability.

23. 发明授权

US5756148A Magnetic recording medium 失效
公开(公告)号：US5756148A
公开(公告)日：1998-05-26
申请号：US761084
申请日：1996-12-04
申请人： Kiyomi Ejiri , Hiroo Inaba , Shinji Saito , Satoru Hayakawa
发明人： Kiyomi Ejiri , Hiroo Inaba , Shinji Saito , Satoru Hayakawa
IPC分类号： G11B5/66 , G11B5/70 , G11B5/716 , G11B5/733 , G11B5/738 , G11B5/842 , G11B5/848 , B05D5/12
CPC分类号： G11B5/848 , G11B5/70 , G11B5/716 , G11B5/733 , G11B5/738 , G11B5/842 , Y10S428/90 , Y10T428/12472 , Y10T428/24355 , Y10T428/24942 , Y10T428/25 , Y10T428/253 , Y10T428/256 , Y10T428/257 , Y10T428/258 , Y10T428/259 , Y10T428/265 , Y10T428/269 , Y10T428/31551 , Y10T428/31721 , Y10T428/31855
摘要： A magnetic recording medium is disclosed, comprising a non-magnetic support having provided thereon at least a lower non-magnetic layer comprising a binder having dispersed therein a non-magnetic powder and an upper magnetic layer comprising a binder having dispersed therein a ferromagnetic powder which has been coated on said lower non-magnetic layer while the lower non-magnetic layer is wet, wherein the upper magnetic layer has an average dry thickness (d) of not more than 1.0 .mu.m and an average thickness variation (.sup..DELTA. d) at the interface between the upper magnetic layer and lower non-magnetic layer is not more than d/2. The magnetic recording medium exhibits excellent electromagnetic characteristics, running properties, and durability.

24. 发明授权

US5672423A Magnetic recording medium having an underlayer containing three different powders 失效
标题翻译：具有含有三种不同粉末的底层的磁记录介质
公开(公告)号：US5672423A
公开(公告)日：1997-09-30
申请号：US378366
申请日：1995-01-25
申请人： Hiroo Inaba , Kiyomi Ejiri
发明人： Hiroo Inaba , Kiyomi Ejiri
IPC分类号： G11B5/738 , G11B5/68
CPC分类号： G11B5/738 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/259 , Y10T428/26 , Y10T428/265
摘要： A magnetic recording medium containing a support having thereon in order, a non-magnetic layer unit and a magnetic layer unit, said magnetic recording medium having been produced by providing a non-magnetic layer unit containing at least one non-magnetic layer and comprising a non-magnetic powder dispersed in a binder on a non-magnetic support followed by providing, while the non-magnetic layer is still wet, a magnetic layer unit containing at least one magnetic layer and comprising a ferromagnetic powder dispersed in a binder on the non-magnetic layer, wherein the mean thickness of the magnetic layer is 1.0 .mu.m or less and the non-magnetic powder in the non-magnetic layer comprises (A) a tabular non-magnetic powder having a tabular size of from 0.01 to 0.3 .mu.m and an aspect ratio of from 3 to 20, or an acicular non-magnetic powder having a long axis of from 0.05 to 0.25 .mu.m and an aspect ratio of from 3 to 15, (B) a carbon black powder having a mean particle size of from 0.01 to 0.04 .mu.m and (C) a powder component having a larger mean particle size than the mean particle size of either powders (A) or (B).
摘要翻译：一种磁记录媒体，其中依次包含一个支撑体，一个非磁性层单元和一个磁性层单元，所述磁记录介质是通过提供一个包含至少一个非磁性层的非磁性层单元制成的，非磁性粉末分散在非磁性载体上的粘合剂中，随后在非磁性层仍然是湿润的同时提供含有至少一个磁性层并包含分散在非粘合剂中的粘合剂中的铁磁性粉末的磁性层单元， - 磁性层，其中磁性层的平均厚度为1.0μm以下，非磁性层中的非磁性粉末包含（A）平板状的非磁性粉末，其平板状尺寸为0.01〜0.3μm m，纵横比为3〜20，或长轴为0.05〜0.25μm，长宽比为3〜15的针状非磁性粉末，（B）具有平均粒子的炭黑粉末大小从0.01到0。（C）具有比粉末（A）或（B）的平均粒径更大的平均粒径的粉末成分。

25. 发明授权

US6020022A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US6020022A
公开(公告)日：2000-02-01
申请号：US846094
申请日：1997-04-25
申请人： Kiyomi Ejiri , Hiroo Inaba , Shinji Saito , Satoru Hayakawa
发明人： Kiyomi Ejiri , Hiroo Inaba , Shinji Saito , Satoru Hayakawa
IPC分类号： G11B5/66 , G11B5/70 , G11B5/716 , G11B5/733 , G11B5/738 , G11B5/842 , G11B5/848
CPC分类号： G11B5/848 , G11B5/70 , G11B5/716 , G11B5/733 , G11B5/738 , G11B5/842 , Y10S428/90 , Y10T428/12472 , Y10T428/24355 , Y10T428/24942 , Y10T428/25 , Y10T428/253 , Y10T428/256 , Y10T428/257 , Y10T428/258 , Y10T428/259 , Y10T428/265 , Y10T428/269 , Y10T428/31551 , Y10T428/31721 , Y10T428/31855
摘要： A magnetic recording medium is disclosed, comprising a non-magnetic support having provided thereon at least a lower non-magnetic layer comprising a binder having dispersed therein a non-magnetic powder and an upper magnetic layer comprising which has been coated on said lower non-magnetic layer while the lower non-magnetic layer is wet or in a dry state, wherein the coating solution for the lower non-magnetic layer having a thixotropic property and the lower non-magnetic layer containing either (a) an acicular inorganic powder having a Mohs hardness of 3 or more and a major axis length of 0.3 .mu.m or less or (b) a spherical inorganic powder other than carbon black having an average primary particle size of 0.08 .mu.m or less. The magnetic recording medium exhibits excellent electromagnetic characteristics, running properties, and durability.
摘要翻译：公开了一种磁记录介质，其包括非磁性载体，其上至少设置有包含非磁性粉末分散在其中的粘合剂的下部非磁性层，以及上部磁性层，其上涂覆有所述下部非磁性层，磁性层，而下部非磁性层是湿的或处于干燥状态，其中具有触变性的下部非磁性层的涂层溶液和下部非磁性层包含（a）针状无机粉末，其具有莫氏硬度为3以上，长轴长度为0.3μm以下，（b）平均一次粒径为0.08μm以下的碳黑以外的球状无机粉末。磁记录介质表现出优异的电磁特性，运行性能和耐久性。

26. 发明授权

US5851622A Magnetic recording medium 失效
公开(公告)号：US5851622A
公开(公告)日：1998-12-22
申请号：US761081
申请日：1996-12-04
申请人： Kiyomi Ejiri , Hiroo Inaba , Shinji Saito , Satoru Hayakawa
发明人： Kiyomi Ejiri , Hiroo Inaba , Shinji Saito , Satoru Hayakawa
IPC分类号： G11B5/66 , G11B5/70 , G11B5/716 , G11B5/733 , G11B5/738 , G11B5/842 , G11B5/848 , G11B5/708
CPC分类号： G11B5/848 , G11B5/70 , G11B5/716 , G11B5/733 , G11B5/738 , G11B5/842 , Y10S428/90 , Y10T428/12472 , Y10T428/24355 , Y10T428/24942 , Y10T428/25 , Y10T428/253 , Y10T428/256 , Y10T428/257 , Y10T428/258 , Y10T428/259 , Y10T428/265 , Y10T428/269 , Y10T428/31551 , Y10T428/31721 , Y10T428/31855
摘要： A magnetic recording medium is disclosed, comprising a non-magnetic support having provided thereon at least a lower non-magnetic layer comprising a binder having dispersed therein a non-magnetic powder and an upper magnetic layer comprising a binder having dispersed therein a ferromagnetic powder which has been coated on said lower non-magnetic layer while the lower non-magnetic layer is wet, wherein the upper magnetic layer has an average dry thickness (d) of not more than 1.0 .mu.m and an average thickness variation (.sup..DELTA. d) at the interface between the upper magnetic layer and lower non-magnetic layer is not more than d/2. The magnetic recording medium exhibits excellent electromagnetic characteristics, running properties, and durability.

27. 发明授权

US5496607A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5496607A
公开(公告)日：1996-03-05
申请号：US348949
申请日：1994-11-25
申请人： Hiroo Inaba , Kiyomi Ejiri , Jun-ichi Nakamikawa , Toshihiko Miura
发明人： Hiroo Inaba , Kiyomi Ejiri , Jun-ichi Nakamikawa , Toshihiko Miura
IPC分类号： G11B5/70 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/06 , G11B5/73 , G11B5/733 , G11B5/738 , B32B3/02 , B32B5/16 , G11B5/66
CPC分类号： G11B5/738 , G11B5/733 , Y10S428/90 , Y10T428/265
摘要： Disclosed is a magnetic recording medium comprising at least two layers comprising at least one lower non-magnetic layer containing at least a non-magnetic particle and a binder on a non-magnetic support, and at least one upper magnetic layer containing at least a ferromagnetic particle and a binder on the lower non-magnetic layer, wherein a mean total thickness d of the upper magnetic layer is more than 0.01 .mu.m to less than 0.3 .mu.m, and a standard deviation .sigma. of the total thickness of the upper magnetic layer and the mean total thickness d of the upper magnetic layer satisfy the relationship of 0.05.ltoreq..sigma./d.ltoreq.0.5.
摘要翻译：公开了包括至少两层的磁记录介质，所述至少两层包括至少一个在非磁性载体上至少含有非磁性颗粒和粘合剂的下非磁性层，以及至少含有至少一种铁磁性颗粒和粘合剂，其中上磁性层的平均总厚度d大于0.01μm至小于0.3μm，上磁层的总厚度的标准偏差σ 并且上部磁性层的平均总厚度d满足0.05≤sigma/ d

28. 发明授权

US5258223A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5258223A
公开(公告)日：1993-11-02
申请号：US822975
申请日：1992-01-21
申请人： Hiroo Inaba , Kiyomi Ejiri
发明人： Hiroo Inaba , Kiyomi Ejiri
IPC分类号： G11B5/706 , G11B5/708 , G11B5/73 , G11B5/733 , G11B5/738 , G11B5/842 , G11B5/848 , B32B5/16 , B32B27/00 , G11B5/66
CPC分类号： G11B5/738 , G11B5/733 , G11B5/842 , G11B5/848 , Y10S428/90 , Y10T428/25 , Y10T428/265 , Y10T428/31551
摘要： A magnetic recording medium is disclosed, comprising a non-magnetic support having provided thereon at least a lower non-magnetic layer comprising a binder having dispersed therein a non-magnetic powder and an upper magnetic layer comprising a binder having dispersed therein a ferromagnetic powder which has been formed on the lower non-magnetic layer while the lower non-magnetic layer is wet, wherein the upper magnetic layer has a dry thickness of not more than 1.0 .mu.m, the ferromagnetic powder in the upper magnetic layer has an average major axis of not more than 0.3 .mu.m and an average crystallite size of not more than 300 .ANG., the non-magnetic powder in the lower non-magnetic layer contains (i) a non-magnetic metal oxide powder and (ii) carbon black having an average primary particle diameter of less than 20 nm at a weight ratio of from 95/5 to 60/40, and the lower non-magnetic layer contains a polyurethane having at least three hydroxyl groups in the molecule thereof and a polyisocyanate compound. The magnetic recording medium exhibits excellent electromagnetic characteristics, running properties, and durability.
摘要翻译：公开了一种磁记录介质，其包括非磁性载体，其上至少设置有包含分散有非磁性粉末的粘结剂的至少一个下部非磁性层，以及包括分散有铁磁性粉末的粘合剂的上磁性层，已经形成在下部非磁性层上，而下部非磁性层是湿的，其中上部磁性层的干燥厚度不大于1.0μm，上部磁性层中的铁磁性粉末具有平均长轴不大于0.3μm，平均微晶尺寸不超过300，下部非磁性层中的非磁性粉末含有（i）非磁性金属氧化物粉末和（ii）具有平均初级粒径小于20nm，重量比为95/5〜60/40，下部非磁性层含有分子中具有至少3个羟基的聚氨酯，而ap 异氰酸酯化合物。磁记录介质表现出优异的电磁特性，运行性能和耐久性。

29. 发明授权

US6030689A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US6030689A
公开(公告)日：2000-02-29
申请号：US916905
申请日：1997-08-21
申请人： Satoshi Matsubaguchi , Hiroo Inaba , Yuichiro Murayama
发明人： Satoshi Matsubaguchi , Hiroo Inaba , Yuichiro Murayama
IPC分类号： B32B27/40 , C09D175/00 , C09D175/04 , G11B5/702 , G11B5/716 , G11B5/738
CPC分类号： G11B5/716 , G11B5/7021 , G11B5/7022 , G11B5/738 , Y10S428/90 , Y10T428/24355 , Y10T428/25 , Y10T428/257 , Y10T428/265 , Y10T428/31609
摘要： A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon at least two coating layers which comprise:a lower coating layer mainly comprising (1) at least one particles selected from nonmagnetic particles or soft magnetic particles and (2) a binder, formed on the support, anda magnetic layer comprising ferromagnetic particles dispersed in a binder, formed on the lower coating layer,wherein at least said lower coating layer contains a polyurethane resin having a cyclic structure and containing an ether group, and said nonmagnetic particles or soft magnetic particles contained in said lower coating layer have an average long axis length of from 0.04 to 0.20 .mu.m and an acicular ratio (long axis/short axis) of from 2 to 10.It is a high-output, low-noise magnetic recording medium having excellent magnetic-layer surface properties and satisfactory running durability.
摘要翻译：公开了一种磁记录介质，包括其上具有至少两个涂层的非磁性载体，其包括：主要包含（1）至少一种选自非磁性颗粒或软磁性颗粒的颗粒和（2）粘合剂的下涂层，形成在所述下涂层上形成有包含分散在粘合剂中的铁磁性粒子的磁性层，其中，至少所述下涂层含有具有环状结构且含有醚基的聚氨酯树脂，所述非磁性粒子或软质所述下涂层所含的磁性粒子的平均长轴长度为0.04〜0.20μm，针状比（长轴/短轴）为2〜10。是高输出，低噪声的磁记录介质具有优异的磁性层表面性能和令人满意的运行耐久性。

30. 发明授权

US6086986A Cleaning medium for magnetic recording devices 失效
标题翻译：磁记录装置用清洁介质
公开(公告)号：US6086986A
公开(公告)日：2000-07-11
申请号：US276672
申请日：1999-03-26
申请人： Masaki Suzuki , Hiroo Inaba
发明人： Masaki Suzuki , Hiroo Inaba
IPC分类号： G11B5/41 , G11B5/708
CPC分类号： G11B5/41 , Y10S428/90 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： A cleaning medium for magnetic recording devices comprises a non-magnetic substrate, a lower coating layer, which is overlaid upon the non-magnetic substrate and primarily contains a binder and non-magnetic inorganic particles dispersed in the binder, and a cleaning layer, which is overlaid upon the lower coating layer and contains a binder and inorganic particles dispersed in the binder and at least containing ferromagnetic particles. An at least 50% by weight portion of the non-magnetic inorganic particles, which are contained in the lower coating layer, is constituted of granular inorganic particles, which have a mean particle diameter of at most 0.08 .mu.m, or acicular inorganic particles, which have a mean longer axis length falling within the range of 0.05 .mu.m to 0.3 .mu.m and an acicular ratio falling within the range of 3 to 20. The cleaning medium removes dirt from magnetic heads with high cleaning power, such that the wear of the magnetic heads may be small and no scratch may occur on the cleaned magnetic heads.
摘要翻译：用于磁记录装置的清洁介质包括非磁性基底，下涂层，其覆盖在非磁性基底上并且主要包含分散在粘合剂中的粘合剂和非磁性无机颗粒以及清洁层，其中覆盖在下涂层上并含有分散在粘合剂中并且至少含有铁磁颗粒的粘合剂和无机颗粒。包含在下涂层中的至少50重量％的非磁性无机颗粒由平均粒径为至多0.08μm的粒状无机颗粒或针状无机颗粒构成，其平均长轴长度在0.05μm至0.3μm的范围内，针状比落在3至20的范围内。清洁介质以高清洁力从磁头去除灰尘，使得磨损磁头可能很小，并且在清洁的磁头上不会发生划痕。

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