专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5686137A Method of providing hexagonal ferrite magnetic powder with enhanced coercive force stability 失效
标题翻译：提供增强矫顽力稳定性的六方晶系铁氧体磁粉的方法
公开(公告)号：US5686137A
公开(公告)日：1997-11-11
申请号：US621330
申请日：1996-03-25
申请人： Etsuji Ogawa , Osamu Kubo , Shunji Kurisu , Tatsumi Maeda
发明人： Etsuji Ogawa , Osamu Kubo , Shunji Kurisu , Tatsumi Maeda
IPC分类号： G11B5/706 , G11B5/708 , G11B5/712
CPC分类号： G11B5/708 , G11B5/70631 , G11B5/70678 , Y10S428/90 , Y10T428/2982
摘要： An object of the present invention is to provide a magnetic powder for magnetic recording and a magnetic recording medium wherein stability of a coercive force of each of the magnetic powder and the magnetic recording medium is improved. The magnetic powder for magnetic recording and the magnetic recording medium having the magnetic powder used therfor are characterized in that the magnetic powder is composed mainly of a plate-shaped ferrite having a crystalline anisotropy and containing an element effective for reducing a temperature coefficient of coercive force of the magnetic powder, and that a difference between a coercive force (Hc) of the magnetic powder at a room temperature and a coercive force (Hc(s)) of the magnetic powder in such a state that the magnetic powder is dispersively deposited on the surface of silica (SiO.sub.2) powder particles is 100 (Oe) or less.
摘要翻译：本发明的目的是提供一种磁记录用磁粉和磁记录介质，其中磁粉和磁记录介质的矫顽力的稳定性提高。用于磁记录的磁粉和具有使用的磁粉的磁记录介质的特征在于，磁粉主要由具有结晶各向异性的板状铁氧体构成，并含有有效降低矫顽力温度系数的元素的磁性粉末，并且在磁性粉末分散沉积的状态下，在室温下的磁粉的矫顽力（Hc）与磁粉的矫顽力（Hc（s））之间的差异二氧化硅（SiO2）粉末颗粒的表面为100（Oe）以下。

2. 发明授权

US5378547A Magnetic powder for magnetic recording and magnetic recording medium containing the same 失效
标题翻译：用于磁记录的磁粉和含有该磁粉的磁记录介质
公开(公告)号：US5378547A
公开(公告)日：1995-01-03
申请号：US869298
申请日：1992-04-16
申请人： Osamu Kubo , Tatsumi Maeda , Tutomu Nomura , Shunji Kurisu , Etsuji Ogawa
发明人： Osamu Kubo , Tatsumi Maeda , Tutomu Nomura , Shunji Kurisu , Etsuji Ogawa
IPC分类号： C01G49/00 , C09D5/23 , C09D7/12 , G11B5/706 , H01F1/047 , G11B5/66
CPC分类号： G11B5/70678 , Y10S428/90 , Y10T428/2982
摘要： A magnetic powder for magnetic recording is disclosed which comprises composite type magnetic particles (A), each of which contains hexagonal ferrite and spinel structure ferrite, and single phase type magnetic particles of hexagonal ferrite (B). When the mixing ratio of (A) and (B) in the range from 5:95 to 95:5, remarkable effect can be obtained. Especially, when the mixing ratio of (A) and (B) is in the range from 5:95 to 30:70, the dispersion property is improved due to disturbance of magnetic stacking. Thus, the magnetic powder in this mixing ratio is particularly suitable for magnetic recording in a short wavelength range. When the mixing ratio of (A) and (B) is in the range 70: 30 to 95:5, the reproduction output is improved due to activation of (A) . Thus, the magnetic powder in this mixing ratio is specifically suitable for magnetic recording in a long wavelength range. By containing the magnetic powder described above, a perpendicular magnetic recording medium with high electromagnetic characteristics, particularly a high S/N ratio and a low noise can be obtained.
摘要翻译：公开了一种用于磁记录的磁粉，其包括复合型磁性颗粒（A），每个复合型磁性颗粒包含六方晶系铁氧体和尖晶石结构铁氧体，以及六方晶系铁氧体（B）的单相型磁性颗粒。当（A）和（B）的混合比在5:95至95:5的范围内时，可以获得显着的效果。特别是，当（A）和（B）的混合比在5:95至30:70的范围内时，由于磁性堆叠的干扰，分散性能得到改善。因此，这种混合比的磁粉特别适用于短波长范围内的磁记录。当（A）和（B）的混合比在70:30至95:5的范围内时，由于（A）的激活，再现输出被改善。因此，该混合比例的磁粉特别适用于长波长范围的磁记录。通过含有上述磁粉，可以获得具有高电磁特性，特别是高S / N比和低噪声的垂直磁记录介质。

3. 发明授权

US4837092A Magnetic recording powder, method of manufacturing thereof and application thereof 失效
标题翻译：磁记录粉，其制造方法及其应用
公开(公告)号：US4837092A
公开(公告)日：1989-06-06
申请号：US84461
申请日：1987-08-12
申请人： Hirotaka Yokoyama , Tadashi Ido , Tatsumi Maeda , Shunji Kurisu
发明人： Hirotaka Yokoyama , Tadashi Ido , Tatsumi Maeda , Shunji Kurisu
IPC分类号： G11B5/706
CPC分类号： G11B5/70678 , Y10S428/90 , Y10T428/2982
摘要： A magnetic recording powder comprising a hexagonal barium ferrite substituted with a coercive force control element. This magnetic powder is preliminarily treated with sulfate ion-containing water so as to convert any free barium ions in the magnetic powder to a water insoluble compound such as BaSO.sub.4 or BaS.sub.2 O.sub.7. There is also proposed a magnetic recording medium having a magnetic layer containing such a magnetic powder as mentioned above.

4. 发明授权

US5494749A Magnetic powder for magnetic recording and magnetic recording medium containing the same 失效
标题翻译：用于磁记录的磁粉和含有该磁粉的磁记录介质
公开(公告)号：US5494749A
公开(公告)日：1996-02-27
申请号：US307284
申请日：1994-09-16
申请人： Osamu Kubo , Tatsumi Maeda , Tutomu Nomura , Shunji Kurisu , Etsuji Ogawa
发明人： Osamu Kubo , Tatsumi Maeda , Tutomu Nomura , Shunji Kurisu , Etsuji Ogawa
IPC分类号： G11B5/706 , B32B5/16
CPC分类号： G11B5/70678 , Y10S428/90 , Y10T428/2982
摘要： A magnetic powder for magnetic recording is disclosed which comprises composite magnetic particles (A), each of which contains hexagonal ferrite and spinel structure ferrite, and single phase magnetic particles of hexagonal ferrite (B). When the mixing ratio [(A):(B)] of (A) and (B) in the range from 5:95 to 95:5, remarkable effect can be obtained. Especially, when the mixing ratio of (A) and (B) is in the range from 5:95 to 30:70, the dispersion property is improved due to disturbance of magnetic stacking. Thus, the magnetic powder in this mixing ratio is particularly suitable for magnetic recording in a short wavelength range. When the mixing ratio of (A) and (B) is in the range from 70:30 to 95:5, the reproduction output is improved due to activation of (A). Thus, the magnetic powder in this mixing ratio is specifically suitable for magnetic recording in a long wavelength range. By containing the magnetic powder described above, a perpendicular magnetic recording medium with high electromagnetic characteristics, particularly a high S/N ratio and a low noise can be obtained.
摘要翻译：公开了一种用于磁记录的磁粉，其包含复合磁性颗粒（A），每个复合磁性颗粒包含六方晶系铁氧体和尖晶石结构铁氧体，以及六方晶系铁氧体的单相磁性颗粒（B）。当（A）和（B）的混合比[（A）：（B）]在5:95至95:5的范围内时，可以获得显着的效果。特别是，当（A）和（B）的混合比在5:95至30:70的范围内时，由于磁性堆叠的干扰，分散性能得到改善。因此，这种混合比的磁粉特别适用于短波长范围内的磁记录。当（A）和（B）的混合比在70:30至95:5的范围内时，由于（A）的激活，再现输出被改善。因此，该混合比例的磁粉特别适用于长波长范围的磁记录。通过含有上述磁粉，可以获得具有高电磁特性，特别是高S / N比和低噪声的垂直磁记录介质。

5. 发明授权

US4699771A Magnetic recording powder, method of manufacturing thereof and application thereof 失效
标题翻译：磁记录粉，其制造方法及其应用
公开(公告)号：US4699771A
公开(公告)日：1987-10-13
申请号：US716120
申请日：1985-03-26
申请人： Hirotaka Yokoyama , Tadashi Ido , Tatsumi Maeda , Shunji Kurisu
发明人： Hirotaka Yokoyama , Tadashi Ido , Tatsumi Maeda , Shunji Kurisu
IPC分类号： G11B5/706 , C01F11/46 , C01G49/02 , C04B35/26
CPC分类号： G11B5/70678 , Y10S428/90 , Y10T428/2982
摘要： A matnetic recording powder comprising a hexagonal barium ferrite substituted with a coercive force control element. This magnetic powder is preliminarily treated with sulfate ion-containing water so as to convert any free barium ions in the magnetic powder to a water insoluble compound such as BaSO.sub.4 or BaS.sub.2 O.sub.7. There is also proposed a magnetic recording medium having a magnetic layer containing such a magnetic powder as mentioned above.
摘要翻译：一种包含被矫顽力控制元件取代的六方晶系钡铁氧体的生物记录粉末。该磁性粉末用含硫酸根离子的水预先处理，以将磁性粉末中的任何游离的钡离子转化为不溶于水的化合物如BaSO 4或BaS 2 O 7。还提出了具有如上所述的含有这种磁性粉末的磁性层的磁记录介质。

6. 发明授权

US5576114A High density magnetic recording medium containing hexagonal system ferrite powder 失效
标题翻译：含六方晶系铁氧体粉末的高密度磁记录介质
公开(公告)号：US5576114A
公开(公告)日：1996-11-19
申请号：US190927
申请日：1994-02-03
申请人： Shunji Kurisu , Osamu Kubo , Tatsumi Maeda , Etsuji Ogawa
发明人： Shunji Kurisu , Osamu Kubo , Tatsumi Maeda , Etsuji Ogawa
IPC分类号： C01G49/00 , G11B5/706 , G11B5/84 , H01F1/11 , H01F1/113 , G11B5/66 , G11B5/70
CPC分类号： C01G49/009 , C01G49/00 , G11B5/70678 , G11B5/84 , H01F1/11 , H01F1/113 , C01P2002/76 , C01P2004/52 , C01P2006/10 , C01P2006/12 , C01P2006/42 , Y10S428/90 , Y10T428/2991
摘要： A magnetic powder is disclosed which is characterized by possessing a powder compression characteristic such that the magnetic powder, after being packed in a closed container, pressed at a load of 400 kgf/cm.sup.3 and relieved of the load, exhibits a packing density in the range of 2.5 to 3.5 g/cm.sup.3 and a geometric standard deviation of not more than 1.5 in the particle diameter distribution. A magnetic recording medium using the magnetic powder mentioned above has high packing and, consequently, secures high output, and has ample diminution of noise.
摘要翻译：公开了一种磁粉，其特征在于具有粉末压缩特性，使得磁粉在被包装在密闭容器中，以400kgf / cm 3的负荷压载并释放负载后，表现出在该范围内的堆积密度为2.5〜3.5g / cm3，粒径分布的几何标准偏差为1.5以下。使用上述磁粉的磁记录介质具有高填充性，因此确保高输出，并且噪声大大降低。

7. 发明授权

US5766763A Hexagonal system ferrite powder for a high density magnetic recording medium 失效
标题翻译：六角系铁氧体粉末用于高密度磁记录介质
公开(公告)号：US5766763A
公开(公告)日：1998-06-16
申请号：US701403
申请日：1996-08-22
申请人： Shunji Kurisu , Osamu Kubo , Tatsumi Maeda , Etsuji Ogawa
发明人： Shunji Kurisu , Osamu Kubo , Tatsumi Maeda , Etsuji Ogawa
IPC分类号： C01G49/00 , G11B5/706 , G11B5/84 , H01F1/11 , H01F1/113 , G11B5/66 , G11B5/70
CPC分类号： C01G49/009 , C01G49/00 , G11B5/70678 , G11B5/84 , H01F1/11 , H01F1/113 , C01P2002/76 , C01P2004/52 , C01P2006/10 , C01P2006/12 , C01P2006/42 , Y10S428/90 , Y10T428/2991
摘要： A magnetic powder is disclosed which is characterized by possessing a powder compression characteristic such that the magnetic powder, after being packed in a closed container, pressed at a load of 400 kgf/cm.sup.3, and relieved of the load, exhibits a packing density in the range of 2.5 to 3.5 g/cm.sup.3 and a geometric standard deviation of not more than 1.5 in the particle diameter distribution. A magnetic recording medium using the magnetic powder mentioned above has high packing and, consequently, secures high output, and has ample diminution of noise.
摘要翻译：公开了一种磁粉，其特征在于具有粉末压缩特性，使得磁粉在被包装在密闭容器中之后，以400kgf / cm 3的负荷压下并释放负载，表现出在范围为2.5〜3.5g / cm3，粒径分布的几何标准偏差为1.5以下。使用上述磁粉的磁记录介质具有高填充性，因此确保高输出，并且噪声大大降低。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式