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1. 发明授权

US06991861B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06991861B2
公开(公告)日：2006-01-31
申请号：US10863714
申请日：2004-06-08
申请人： Akiko Watanabe , Katsunori Maeshima , Tomoo Fukuda , Noboru Sekiguchi
发明人： Akiko Watanabe , Katsunori Maeshima , Tomoo Fukuda , Noboru Sekiguchi
IPC分类号： G11B5/706
CPC分类号： G11B5/714 , G11B5/70
摘要： The coating-type magnetic recording medium has a non-magnetic layer mainly composed of a non-magnetic powder and binder, and a magnetic layer mainly composed of a ferromagnetic powder and a binder, which are stacked in this order on a non-magnetic substrate, wherein dispersion σL/L of long-axis length of all ferromagnetic powder particles contained in the magnetic layer falls in a range of σL/L≦±10%, where L is an average long-axis length and σL is a standard deviation thereof, and dispersion σW/W of short-axis length of all ferromagnetic powders contained in the magnetic layer falls in a range of σW/W≦±15%, where W is an average short-axis length and σW is a standard deviation thereof. The average long-axis length L is typically adjusted within the range of 0.08 μm and 0.12 μm, and the Switching Field Distribution (SFD) of the medium is adjusted to 0.25 or less.
摘要翻译：涂布型磁记录介质具有主要由非磁性粉末和粘合剂组成的非磁性层和主要由铁磁性粉末和粘合剂组成的磁性层，它们依次层叠在非磁性基板上其中，包含在磁性层中的所有铁磁性粉末颗粒的长轴长度的分散SigmaL / L落在sLL /L≤±10％的范围内，其中L是平均长轴长度，sigmaL是标准偏差并且包含在磁性层中的所有铁磁粉末的短轴长度的色散σW / W落在σW/ W <=±15％的范围内，其中W是平均短轴长度，sigmaW是标准偏差其中。平均长轴长度L通常在0.08μm和0.12μm的范围内调节，并且将介质的开关场分布（SFD）调节至0.25或更小。

2. 发明申请

US20060172156A1 Magnetic recording medium and process for producing same 审中-公开
标题翻译：磁记录介质及其制造方法
公开(公告)号：US20060172156A1
公开(公告)日：2006-08-03
申请号：US11335122
申请日：2006-01-19
申请人： Katsunori Maeshima , Masaru Terakawa , Noboru Sekiguchi , Takeshi Akasaka , Yuichi Masuzawa
发明人： Katsunori Maeshima , Masaru Terakawa , Noboru Sekiguchi , Takeshi Akasaka , Yuichi Masuzawa
IPC分类号： G11B5/716
CPC分类号： G11B5/842 , G11B5/70
摘要： A magnetic recording medium includes a non-magnetic supporter; a lower non-magnetic layer containing at least inorganic particles and a binder resin; and a magnetic layer containing at least a magnetic powder and a binder resin and having a thickness of 100 nm or less, the lower non-magnetic layer and the magnetic layer being laminated on a main surface of the non-magnetic supporter, wherein the magnetic layer is formed by a process including applying a paint for forming the lower non-magnetic layer; drying the applied paint; and applying a magnetic paint while the lower non-magnetic layer is kept in a film state after drying.
摘要翻译：磁记录介质包括非磁性支持体; 至少含有无机颗粒和粘合剂树脂的下层非磁性层; 以及至少含有磁性粉末和粘合剂树脂并且具有100nm以下的厚度的磁性层，所述下部非磁性层和所述磁性层被层压在所述非磁性支撑体的主表面上，其中所述磁性层通过包括涂覆用于形成下部非磁性层的涂料的方法形成; 干燥涂料; 并且在干燥后将下部非磁性层保持在膜状态下施加磁性涂料。

3. 发明授权

US07295402B2 Magnetic tape cartridge and recorder/reproducer a magnetic tape cartridge 失效
标题翻译：磁带盒和记录器/再现器一个磁带盒
公开(公告)号：US07295402B2
公开(公告)日：2007-11-13
申请号：US10502608
申请日：2003-01-20
申请人： Wataru Okawa , Minoru Yamaga , Katsunori Maeshima , Noriyuki Hirai , Satoshi Sato
发明人： Wataru Okawa , Minoru Yamaga , Katsunori Maeshima , Noriyuki Hirai , Satoshi Sato
IPC分类号： G11B5/00
CPC分类号： B82Y10/00 , G11B5/00813 , G11B5/3903 , G11B5/40 , G11B5/735 , G11B5/738 , G11B5/78 , G11B15/67 , G11B23/107 , G11B23/26 , G11B33/1493
摘要： A magnetic tape cartridge and A magnetic tape cartridge recording/reproducing apparatus, which can prevent a magnetic tape from being charged to avoid damage of a magnetic head while lowering the resistance of the magnetic tape and maintaining optimum electromagnetic conversion properties. A tape reel (7) is formed from a conductive material, and one end portion of a magnetic tape (6) connected to a reel hub (7B) has a surface resistivity [Ω/sq] in the order of 107 or less. In the magnetic tape (6) having a multilayer structure which comprises a magnetic layer (23), a nonmagnetic conductor layer (22), a plastic film (21), and a back coat layer (24) from the magnetic surface (6M) side, even when the surface resistivity of the magnetic layer (23) exceeds 107 Ω/sq, the magnetic layer (23) is removed and the exposed nonmagnetic conductor layer (22) is connected to the reel hub (7A), thus lowering the resistance of the magnetic tape while maintaining optimum electromagnetic conversion properties.
摘要翻译：一种磁带盒和A磁带盒记录/再现装置，其可以防止磁带被充电以避免在降低磁带的电阻的同时降低磁头的损坏并保持最佳的电磁转换特性。磁带卷轴（7）由导电材料形成，并且连接到卷轴毂（7B）的磁带（6）的一个端部的表面电阻率（Ω/ sq）大约为10〜 7以下。在具有多层结构的磁带（6）中，包括磁性层（23），非磁性导体层（22），塑料膜（21）和背面涂层（24））侧，即使当磁性层（23）的表面电阻率超过10Ω/ sq时，磁性层（23）被去除并且暴露的非磁性导体层（22）连接到卷轴毂（7A），从而降低磁带的电阻，同时保持最佳的电磁转换特性。

4. 发明申请

US20100323222A1 MAGNETIC RECORDING MEDIUM AND METHOD FOR MANUFACTURING THE SAME 审中-公开
标题翻译：磁记录介质及其制造方法
公开(公告)号：US20100323222A1
公开(公告)日：2010-12-23
申请号：US12815678
申请日：2010-06-15
申请人： Eiji Nakashio , Futoshi Sasaki , Katsunori Maeshima , Yusuke Tamakawa , Kuniko Yamamoto , Minoru Yamaga
发明人： Eiji Nakashio , Futoshi Sasaki , Katsunori Maeshima , Yusuke Tamakawa , Kuniko Yamamoto , Minoru Yamaga
IPC分类号： G11B5/84 , G11B5/00
CPC分类号： G11B5/708 , G11B5/73 , G11B5/82 , G11B5/842
摘要： A magnetic recording medium includes: a nonmagnetic support having both principal planes, a nonmagnetic layer formed on one principal plane of the nonmagnetic support and containing a nonmagnetic powder, a conductive particle and a binder, and a magnetic layer formed on the nonmagnetic layer and containing a magnetic powder, a conductive particle and a binder, wherein each of the nonmagnetic layer and the magnetic layer is prepared in a wet on dry mode, and a conduction point particle size of the conductive particle contained in the magnetic layer falls within the range of 3 times or more and not more than 5 times an average thickness of the magnetic layer.
摘要翻译：磁记录介质包括：具有两个主平面的非磁性载体，形成在非磁性载体的一个主平面上并包含非磁性粉末，导电颗粒和粘合剂的非磁性层，以及形成在非磁性层上的含有磁性粉末，导电性粒子和粘合剂，其中非磁性层和磁性层中的每一个以湿式干燥模式制备，并且包含在磁性层中的导电性粒子的导点粒径落在磁性层的平均厚度的3倍以上且5倍以下。

5. 发明申请

US20060228591A1 MAGNETIC RECORDING MEDIUM 审中-公开
标题翻译：磁记录介质
公开(公告)号：US20060228591A1
公开(公告)日：2006-10-12
申请号：US11278708
申请日：2006-04-05
申请人： Masaru Terakawa , Katsunori Maeshima
发明人： Masaru Terakawa , Katsunori Maeshima
IPC分类号： G11B5/706
CPC分类号： G11B5/7085 , G11B5/70 , G11B5/842
摘要： A magnetic recording medium includes a nonmagnetic substrate, a nonmagnetic underlayer containing at least inorganic particles and a binder resin, and a magnetic layer containing at least a magnetic powder, a binder resin, and abrasive particles, the nonmagnetic underlayer and the magnetic layer being disposed in that order on at least one principal surface of the nonmagnetic substrate. The magnetic layer is formed after a coating material for forming the nonmagnetic underlayer is applied and subjected to drying treatment. The thickness Z of the magnetic layer is 100 nm or less, the average particle diameter Da (nm) of the abrasive particles and the thickness Z (nm) of the magnetic layer satisfy the relationship 1.0≦Da/Z≦1.5, and the maximum particle diameter Dm (nm) and the thickness Z (nm) of the magnetic layer satisfy the relationship Dm/Z≦1.8.
摘要翻译：磁记录介质包括非磁性基底，至少含有无机颗粒和粘合剂树脂的非磁性底层，以及至少含有磁性粉末，粘合剂树脂和磨料颗粒的磁性层，非磁性底层和磁性层被设置在该非磁性基底的至少一个主表面上。在施加用于形成非磁性底层的涂层材料并进行干燥处理之后形成磁性层。磁性层的厚度Z为100nm以下，磨粒的平均粒径Da（nm）和磁性层的厚度Z（nm）满足关系1.0 <= Da / Z <= 1.5，以及磁性层的最大粒径Dm（nm）和厚度Z（nm）满足关系Dm / Z <= 1.8。

6. 发明申请

US20050105210A1 Magnetic tape cartridge and recorder/reproducer a magnetic tape cartridge 失效
标题翻译：磁带盒和记录器/再现器一个磁带盒
公开(公告)号：US20050105210A1
公开(公告)日：2005-05-19
申请号：US10502608
申请日：2003-01-20
申请人： Wataru Okawa , Minoru Yamaga , Katsunori Maeshima , Noriyuki Hirai , Satoshi Sato
发明人： Wataru Okawa , Minoru Yamaga , Katsunori Maeshima , Noriyuki Hirai , Satoshi Sato
IPC分类号： G11B5/735 , G11B5/008 , G11B5/39 , G11B5/40 , G11B5/738 , G11B5/78 , G11B15/67 , G11B23/087 , G11B23/107 , G11B23/26 , G11B33/14 , G11B5/00
CPC分类号： B82Y10/00 , G11B5/00813 , G11B5/3903 , G11B5/40 , G11B5/735 , G11B5/738 , G11B5/78 , G11B15/67 , G11B23/107 , G11B23/26 , G11B33/1493
摘要： A magnetic tape cartridge and A magnetic tape cartridge recording/reproducing apparatus, which can prevent a magnetic tape from being charged to avoid damage of a magnetic head while lowering the resistance of the magnetic tape and maintaining optimum electromagnetic conversion properties. A tape reel (7) is formed from a conductive material, and one end portion of a magnetic tape (6) connected to a reel hub (7B) has a surface resistivity [Ω/sq] in the order of 107 or less. In the magnetic tape (6) having a multilayer structure which comprises a magnetic layer (23), a nonmagnetic conductor layer (22), a plastic film (21), and a back coat layer (24) from the magnetic surface (6M) side, even when the surface resistivity of the magnetic layer (23) exceeds 107 Ω/sq, the magnetic layer (23) is removed and the exposed nonmagnetic conductor layer (22) is connected to the reel hub (7A), thus lowering the resistance of the magnetic tape while maintaining optimum electromagnetic conversion properties.
摘要翻译：一种磁带盒和A磁带盒记录/再现装置，其可以防止磁带被充电以避免在降低磁带的电阻的同时降低磁头的损坏并保持最佳的电磁转换特性。磁带卷轴（7）由导电材料形成，并且连接到卷轴毂（7B）的磁带（6）的一个端部的表面电阻率（Ω/ sq）大约为10〜 7以下。在具有多层结构的磁带（6）中，包括磁性层（23），非磁性导体层（22），塑料膜（21）和背面涂层（24））侧，即使当磁性层（23）的表面电阻率超过10Ω/ sq时，磁性层（23）被去除并且暴露的非磁性导体层（22）连接到卷轴毂（7A），从而降低磁带的电阻，同时保持最佳的电磁转换特性。

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