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1. 发明申请

US20080124584A1 Magnetic recording medium 审中-公开
标题翻译：磁记录介质
公开(公告)号：US20080124584A1
公开(公告)日：2008-05-29
申请号：US11981314
申请日：2007-10-31
申请人： Atsushi Kato , Junji Kagawa , Hiroyuki Murakami , Fumiko Koike
发明人： Atsushi Kato , Junji Kagawa , Hiroyuki Murakami , Fumiko Koike
IPC分类号： G11B5/73
CPC分类号： G11B5/716
摘要： A magnetic recording medium includes a non-magnetic supporter, a first magnetic layer and a second magnetic layer on which magnetic paints made of different ferromagnetic materials are applied in order of the first magnetic layer and the second magnetic layer on the non-magnetic supporter. Both the first magnetic layer and the second magnetic layer include polyester polyol having an alicyclic framework and a polyurethane resin composed of diisocyanate.
摘要翻译：磁记录介质包括非磁性载体，第一磁性层和第二磁性层，在非磁性载体上以第一磁性层和第二磁性层的顺序施加由不同的铁磁材料制成的磁性涂料。第一磁性层和第二磁性层都包括具有脂环族骨架的聚酯多元醇和由二异氰酸酯组成的聚氨酯树脂。

2. 发明授权

US07585576B2 Magnetic recording medium with dual magnetic layers including specific resins 失效
标题翻译：具有双磁性层的磁记录介质，包括特定的树脂
公开(公告)号：US07585576B2
公开(公告)日：2009-09-08
申请号：US10714021
申请日：2003-11-13
申请人： Atsushi Kato , Junji Kagawa , Hiroyuki Murakami , Fumiko Koike
发明人： Atsushi Kato , Junji Kagawa , Hiroyuki Murakami , Fumiko Koike
IPC分类号： G11B5/702
CPC分类号： G11B5/716
摘要： A magnetic recording medium includes a non-magnetic supporter, a first magnetic layer and a second magnetic layer on which magnetic paints made of different ferromagnetic materials are applied in order of the first magnetic layer and the second magnetic layer on the non-magnetic supporter. Both the first magnetic layer and the second magnetic layer include polyester polyol having an alicyclic framework and a polyurethane resin composed of diisocyanate.
摘要翻译：磁记录介质包括非磁性载体，第一磁性层和第二磁性层，在非磁性载体上以第一磁性层和第二磁性层的顺序施加由不同的铁磁材料制成的磁性涂料。第一磁性层和第二磁性层都包括具有脂环族骨架的聚酯多元醇和由二异氰酸酯组成的聚氨酯树脂。

3. 发明申请

US20050186451A1 Magnetic recording medium 失效
公开(公告)号：US20050186451A1
公开(公告)日：2005-08-25
申请号：US11117850
申请日：2005-04-29
申请人： Atsushi Kato , Naoyuki Numata , Junji Kagawa
发明人： Atsushi Kato , Naoyuki Numata , Junji Kagawa
IPC分类号： G11B5/706 , G11B5/716 , G11B5/17
CPC分类号： G11B5/716 , Y10T428/24942 , Y10T428/256
摘要： The present invention provides a magnetic recording medium which can record both digital and analog signals by, e.g., VTR for commercial use and improve their electromagnetic conversion characteristics. A magnetic recording medium comprises a nonmagnetic support, and first and second magnetic layers comprised respectively of magnetic powder (A) and (B), wherein the first and second magnetic layers are formed on the nonmagnetic support in this order, wherein the magnetic powder (A) and (B) have the following characteristics: saturation magnetization σs(A) 80 to 150 Am2/kg; coercive force Hc(A) 90 to 180 kA/m, saturation magnetization σs(B)100 to 200 Am2/kg, coercive force Hc(B)100 to 200 kA/m, wherein the first and second magnetic layers satisfy the below relationships and have thickness T(A) and T(B) in the below ranges: σs(A)/σs(B)≦1.0, Hc(A)/Hc(B)≦1.0, 1.0 μm≦T(A)≦4.0 μm, 0.01 μm≦T(B)≦0.5 μm.

4. 发明授权

US06972158B2 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US06972158B2
公开(公告)日：2005-12-06
申请号：US11118251
申请日：2005-04-29
申请人： Atsushi Kato , Naoyuki Numata , Junji Kagawa
发明人： Atsushi Kato , Naoyuki Numata , Junji Kagawa
IPC分类号： G11B5/706 , G11B5/716
CPC分类号： G11B5/716 , Y10T428/24942 , Y10T428/256
摘要： The present invention provides a magnetic recording medium which can record both digital and analog signals by, e.g., VTR for commercial use and improve their electromagnetic conversion characteristics. A magnetic recording medium comprises a nonmagnetic support, and first and second magnetic layers comprised respectively of magnetic powder (A) and (B), wherein the first and second magnetic layers are formed on the nonmagnetic support in this order, wherein the magnetic powder (A) and (B) have the following characteristics: saturation magnetization σs(A): 80 to 150 Am2/kg; coercive force Hc(A): 90 to 180 kA/m, saturation magnetization σs(B): 100 to 200 Am2/kg, coercive force Hc(B): 100 to 200 kA/m, wherein the first and second magnetic layers satisfy the below relationships and have thickness T(A) and T(B) in the below ranges: σs(A)/σs(B)≦1.0,Hc(A)/Hc(B)≦1.0, 1.0 μm≦T(A)≦4.0 μm, 0.01 μm≦T(B)≦0.5 μm.
摘要翻译：本发明提供一种磁记录介质，其可通过例如用于商业用途的VTR记录数字和模拟信号，并提高其电磁转换特性。磁记录介质包括非磁性载体以及分别由磁性粉末（A）和（B）组成的第一和第二磁性层，其中第一和第二磁性层依次形成在非磁性载体上，其中磁性粉末（ A）和（B）具有以下特性：饱和磁化线（A）：80-150Am 2 / kg; 矫顽力Hc（A）：90〜180kA / m，饱和磁化信号（B）：100〜200Am 2 / kg，矫顽力Hc（B）：100〜200kA / 其中第一和第二磁性层满足以下关系，并且在下列范围内具有厚度T（A）和T（B）：<？在线公式描述=“在线公式”end =“lead” sigmas（A）/ sigmas（B）<= 1.0，Hc（A）/ Hc（B）<= 1.0，<？in-line-formula description =“In-line Formulas”end =“tail”？> in-line-formula description =“In-line Formulas”end =“lead”？> 1.0 mum <= T（A）<= 4.0 mum，0.01 mum <= T（B）<= 0.5 mum < line-formula description =“In-line Formulas”end =“tail”？>

5. 发明授权

US06989203B2 Magnetic recording medium 失效
公开(公告)号：US06989203B2
公开(公告)日：2006-01-24
申请号：US11117850
申请日：2005-04-29
申请人： Atsushi Kato , Naoyuki Numata , Junji Kagawa
发明人： Atsushi Kato , Naoyuki Numata , Junji Kagawa
IPC分类号： G11B5/716
CPC分类号： G11B5/716 , Y10T428/24942 , Y10T428/256
摘要： The present invention provides a magnetic recording medium which can record both digital and analog signals by, e.g., VTR for commercial use and improve their electromagnetic conversion characteristics. A magnetic recording medium comprises a nonmagnetic support, and first and second magnetic layers comprised respectively of magnetic powder (A) and (B), wherein the first and second magnetic layers are formed on the nonmagnetic support in this order, wherein the magnetic powder (A) and (B) have the following characteristics: saturation magnetization σs(A) 80 to 150 Am2/kg; coercive force Hc(A) 90 to 180 kA/m, saturation magnetization σs(B)100 to 200 Am2/kg, coercive force Hc(B)100 to 200 kA/m, wherein the first and second magnetic layers satisfy the below relationships and have thickness T(A) and T(B) in the below ranges: σs(A)/σs(B)≦1.0, Hc(A)/Hc(B)≦1.0, 1.0 μm≦T(A)≦4.0 μm, 0.01 μm≦T(B)≦0.5 μm.

6. 发明申请

US20050196640A1 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US20050196640A1
公开(公告)日：2005-09-08
申请号：US11118251
申请日：2005-04-29
申请人： Atsushi Kato , Naoyuki Numata , Junji Kagawa
发明人： Atsushi Kato , Naoyuki Numata , Junji Kagawa
IPC分类号： G11B5/706 , G11B5/716 , G11B5/17
CPC分类号： G11B5/716 , Y10T428/24942 , Y10T428/256
摘要： The present invention provides a magnetic recording medium which can record both digital and analog signals by, e.g., VTR for commercial use and improve their electromagnetic conversion characteristics. A magnetic recording medium comprises a nonmagnetic support, and first and second magnetic layers comprised respectively of magnetic powder (A) and (B), wherein the first and second magnetic layers are formed on the nonmagnetic support in this order, wherein the magnetic powder (A) and (B) have the following characteristics: saturation magnetization σs(A): 80 to 150 Am2/kg; coercive force Hc(A): 90 to 180 kA/m, saturation magnetization σs(B): 100 to 200 Am2/kg, coercive force Hc(B): 100 to 200 kA/m, wherein the first and second magnetic layers satisfy the below relationships and have thickness T(A) and T(B) in the below ranges: σs(A)/σs(B)≦1.0,Hc(A)/Hc(B)≦1.0, 1.0 μm≦T(A)≦4.0 μm,0.01 μm≦T(B)≦0.5 μm.
摘要翻译：本发明提供一种磁记录介质，其可通过例如用于商业用途的VTR记录数字和模拟信号，并提高其电磁转换特性。磁记录介质包括非磁性载体以及分别由磁性粉末（A）和（B）组成的第一和第二磁性层，其中第一和第二磁性层依次形成在非磁性载体上，其中磁性粉末（ A）和（B）具有以下特性：饱和磁化线（A）：80-150Am 2 / kg; 矫顽力Hc（A）：90〜180kA / m，饱和磁化信号（B）：100〜200Am 2 / kg，矫顽力Hc（B）：100〜200kA / 其中第一和第二磁性层满足以下关系，并且在下列范围内具有厚度T（A）和T（B）：<？在线公式描述=“在线公式”end =“lead” sigmas（A）/ sigmas（B）<= 1.0，Hc（A）/ Hc（B）<= 1.0，<？in-line-formula description =“In-line Formulas”end =“tail”？> in-line-formula description =“In-line Formulas”end =“lead”？> 1.0 mum <= T（A）<= 4.0 mum，0.01 mum <= T（B）<= 0.5 mum。 <？in-line-formula description =“In-line Formulas”end =“tail”？>

7. 发明授权

US06929850B2 Magnetic recording medium 失效
公开(公告)号：US06929850B2
公开(公告)日：2005-08-16
申请号：US10442720
申请日：2003-05-21
申请人： Atsushi Kato , Naoyuki Numata , Junji Kagawa
发明人： Atsushi Kato , Naoyuki Numata , Junji Kagawa
IPC分类号： G11B5/706 , G11B5/716
CPC分类号： G11B5/716 , Y10T428/24942 , Y10T428/256
摘要： The present invention provides a magnetic recording medium which can record both digital and analog signals by, e.g., VTR for commercial use and improve their electromagnetic conversion characteristics. A magnetic recording medium comprises a nonmagnetic support, and first and second magnetic layers comprised respectively of magnetic powder (A) and (B), wherein the first and second magnetic layers are formed on the nonmagnetic support in this order, wherein the magnetic powder (A) and (B) have the following characteristics: saturation magnetization σs(A)80 to 150Am2/kg; coercive force Hc(A)90 to 180kA/m, saturation magnetization σs(B)100 to 200Am2/kg, coercive force Hc(B)100 to 200kA/m, wherein the first and second magnetic layers satisfy the below relationships and have thickness T(A) and T(B) in the below ranges: σs(A)/σs(B)≦1.0, Hc(A)/Hc(B)≦1.0, 1.0 μm≦T(A)≦4.0 μm, 0.01 μm≦T(B)≦0.5 μm.

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