公开(公告)号：US06790522B2

公开(公告)日：2004-09-14

申请号：US10252417

申请日：2002-09-24

申请人： Nobuo Yamazaki ,  Hitoshi Noguchi ,  Shinji Saito

发明人： Nobuo Yamazaki ,  Hitoshi Noguchi ,  Shinji Saito

IPC分类号： G11B5712

CPC分类号： G11B5/70678 ,  G11B5/712

摘要： A magnetic recording medium comprising a support having provided thereon a magnetic layer containing a barium ferrite powder dispersed in a binder, wherein the concentration of Ba of the extract obtained by the following condition is 20 ppm or less per m2 of the magnetic recording medium: condition: 0.05 m2 of the magnetic recording medium is arbitrarily cut out and put in a 200 ml beaker with 100 ml of distilled water, the beaker is covered with a watch glass and retained in a constant temperature bath at 75° C. for 3 hours.

摘要翻译： 一种磁记录介质，包括在其上设置有分散在粘合剂中的铁氧体粉末的磁性层的支撑体，其中通过以下条件获得的提取物的Ba浓度为每m 2磁记录20ppm以下 介质：条件：将0.05m 2的磁记录介质任意切出，并用100ml蒸馏水放入200ml烧杯中，用手表玻璃覆盖烧杯，并保持在75℃的恒温浴中 C. 3小时。

公开(公告)号：US5728442A

公开(公告)日：1998-03-17

申请号：US605860

申请日：1996-02-23

申请人： Hitoshi Noguchi ,  Nobuo Yamazaki ,  Shinji Saito

发明人： Hitoshi Noguchi ,  Nobuo Yamazaki ,  Shinji Saito

IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  G11B5/706 ,  G11B5/738 ,  G11B5/82

CPC分类号： G11B5/70678 ,  G11B5/70 ,  G11B5/738 ,  Y10T428/257 ,  Y10T428/26 ,  Y10T428/265

摘要： A magnetic recording disk which comprises a nonmagnetic support having provided thereon a magnetic layer comprising a hexagonal ferrite magnetic material dispersed in a binder, wherein the magnetic layer has an orientation ratio of 0.9 or more, a vertical diamagnetic correction squareness ratio of from 0.3 to 0.55, an in-plane coercive force of from 1,400 to 3,000 Oe, a vertical-direction coercive force of from 1,400 to 3,000 Oe, and a dry thickness of 0.8 .mu.m or less.

摘要翻译： 一种磁记录盘，其包括具有分散在粘合剂中的包含六方晶系铁氧体磁性材料的磁性层的非磁性载体，其中所述磁性层的取向比为0.9以上，垂直抗磁性校正矩形比为0.3〜0.55 1400〜3000Oe的平面内矫顽力，1400〜3000Oe的纵向矫顽力，0.8μm以下的干燥厚度。

公开(公告)号：US5496653A

公开(公告)日：1996-03-05

申请号：US245486

申请日：1994-05-18

申请人： Shinji Saito ,  Nobuo Yamazaki ,  Hitoshi Noguchi

发明人： Shinji Saito ,  Nobuo Yamazaki ,  Hitoshi Noguchi

IPC分类号： G11B5/70 ,  C09D5/23 ,  G11B5/706 ,  G11B5/738 ,  G11B5/845 ,  G11B5/852 ,  G11B5/66

CPC分类号： G11B5/852 ,  G11B5/70678 ,  G11B5/845 ,  Y10S428/90

摘要： A magnetic recording medium having good characteristics over all recording wavelength regions, comprising a non-magnetic support having thereon a magnetic layer mainly comprising a tabular ferromagnetic hexagonal ferrite particle and a binder, wherein said ferromagnetic hexagonal ferrite powder is magnetically orientated in the longitudinal direction of the medium, and said magnetic layer has a glossiness in the longitudinal direction of the medium of 200% or more and at least 3% higher than that in the width direction of the medium.

摘要翻译： 一种在所有记录波长区域具有良好特性的磁记录介质，包括其上具有主要包括片状铁磁性六方晶系铁氧体颗粒和粘结剂的磁性层的非磁性载体，其中所述铁磁性六方晶系铁氧体粉末沿纵向方向磁性取向 所述介质，并且所述磁性层在介质的纵向上具有比介质的宽度方向上高200％以上且至少3％的光泽度。

公开(公告)号：US06791803B2

公开(公告)日：2004-09-14

申请号：US10218569

申请日：2002-08-15

申请人： Shinji Saito ,  Nobuo Yamazaki ,  Hitoshi Noguchi

发明人： Shinji Saito ,  Nobuo Yamazaki ,  Hitoshi Noguchi

IPC分类号： G11B502

CPC分类号： G11B5/714 ,  G11B5/70 ,  G11B5/70678 ,  Y10T428/257

摘要： Provided are a method of magnetic recording and reproducing capable of permitting high density recording on magnetic recording media even under the condition of high data transfer rates and yielding adequate recording and reproduction characteristics when an MR head is used in reproduction, and a magnetic recording medium capable of being used in this magnetic recording and reproducing method. The magnetic recording and reproducing method is a method for reproducing a signal magnetically recorded on a magnetic recording medium with a magnetoresistive (MR) head. The magnetic recording medium comprises a substantially nonmagnetic lower layer and a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder in this order on at least one side of a nonmagnetic support, in which said hexagonal ferrite ferromagnetic powder has a mean plate diameter ranging from 15 to 40 nm and a mean plate thickness ranging from 4 to 15 nm, and said magnetic layer has a coercive force Hc ranging from 143.3 to 318.4 kA/m, and said signal magnetically recorded has a maximum recording frequency ranging from 10 to 80 MHz.

摘要翻译： 提供了一种磁记录和再现方法，即使在高数据传输速率的条件下也能够在磁记录介质上进行高密度记录，并且当在再现中使用MR磁头时产生足够的记录和再现特性，以及能够使用磁记录介质 被用于这种磁记录和再现方法中。 磁记录和再现方法是一种利用磁阻（MR）磁头再现磁记录在磁记录介质上的信号的方法。 磁记录介质在非磁性载体的至少一侧上依次包括基本上非磁性的下层和包含六方铁素体铁磁粉末和粘合剂的磁性层，其中所述六方晶系铁氧体铁磁粉末的平均板直径范围为 15至40nm，平均板厚度范围为4至15nm，所述磁性层的矫顽力Hc为143.3至318.4kA / m，磁性记录的所述信号具有10至80MHz的最大记录频率 。

公开(公告)号：US5601916A

公开(公告)日：1997-02-11

申请号：US524680

申请日：1995-09-07

申请人： Nobuo Yamazaki ,  Hitoshi Noguchi ,  Shinji Saito

发明人： Nobuo Yamazaki ,  Hitoshi Noguchi ,  Shinji Saito

IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/68 ,  G11B5/70 ,  G11B5/706 ,  G11B5/716 ,  G11B5/738

CPC分类号： G11B5/716 ,  G11B5/70 ,  G11B5/70678 ,  G11B5/738 ,  Y10S428/90 ,  Y10T428/257 ,  Y10T428/265

摘要： A magnetic recording medium is described, which comprises a nonmagnetic support having thereon at least one magnetic layer containing ferromagnetic particles dispersed in a binder, wherein the magnetic recording medium has at least one magnetic layer containing at least hexagonal ferrite magnetic particles and the magnetic layer containing the hexagonal ferrite magnetic particles has a coercive force, Hc, of from 1,300 to 5,000 Oe, a ratio of the Hc to an anisotropic magnetic field HK thereof, Hc/HK, of from 0.30 to 1.0, and a squareness ratio of in-plane direction, SQ, of from 0.65 to 1.00.

摘要翻译： 描述了一种磁记录介质，其包括其上具有至少一个含有分散在粘合剂中的铁磁性颗粒的磁性层的非磁性载体，其中该磁记录介质具有至少一个至少含有六方晶系铁氧体磁性颗粒的磁性层和含有 六方晶系铁氧体磁性颗粒的矫顽力Hc为1,300-5,000Oe，Hc与各向异性磁场HK之比Hc / HK为0.30至1.0，平面比为 方向，SQ从0.65到1.00。

公开(公告)号：US07515383B2

公开(公告)日：2009-04-07

申请号：US11237973

申请日：2005-09-29

申请人： Shinji Saito ,  Hitoshi Noguchi ,  Nobuo Yamazaki

发明人： Shinji Saito ,  Hitoshi Noguchi ,  Nobuo Yamazaki

IPC分类号： G11B5/02 ,  G11B5/48 ,  G11B5/714

CPC分类号： G11B5/70678 ,  G11B5/70 ,  G11B5/714

摘要： Provided is a magnetic recording medium exhibiting good electromagnetic characteristics in high-density recording The magnetic recording medium employed for magnetically recording signals with a track width equal to or less than 2.0 μm and reproducing the magnetically recorded signals, wherein said magnetic recording medium comprises a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder or comprises a nonmagnetic layer comprise a nonmagnetic powder and a binder and a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder in this order on a nonmagnetic support. Said magnetic layer has a thickness equal to or less than 0.2 μm, and said hexagonal ferrite ferromagnetic powder has an average plate diameter being 1/30 or less of the magnetically recorded track width as well as ½ or less of the thickness of the magnetic layer.

摘要翻译： 提供了一种在高密度记录中表现出良好电磁特性的磁记录介质。磁记录介质，用于磁记录磁道宽度等于或小于2.0μm的信号，并再现磁记录信号，其中所述磁记录介质包括磁 包含六方晶系铁氧体铁磁性粉末和粘合剂的层或包含非磁性层的非磁性层在非磁性载体上依次包含非磁性粉末和粘合剂以及包含六方晶系铁磁铁磁性粉末和粘合剂的磁性层。 所述磁性层具有等于或小于0.2μm的厚度，并且所述六方晶系铁氧体铁磁粉末的平均板直径是磁记录磁道宽度的1/30或更小，以及磁层的厚度的1/2或更小 。

公开(公告)号：US5714275A

公开(公告)日：1998-02-03

申请号：US571397

申请日：1995-12-13

申请人： Nobuo Yamazaki ,  Hitoshi Noguchi ,  Shinji Saito

发明人： Nobuo Yamazaki ,  Hitoshi Noguchi ,  Shinji Saito

IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/68 ,  G11B5/706 ,  G11B5/716 ,  G11B5/73 ,  G11B5/738 ,  G11B5/66 ,  G11B5/70

CPC分类号： G11B5/738 ,  G11B5/70605 ,  G11B5/716 ,  Y10S428/90

摘要： A magnetic recording medium is described, comprising a nonmagnetic support having provided thereon at least a magnetic layer comprising ferromagnetic metal particles dispersed in a binder, wherein the magnetic layer has a coercive force, Hc, of from 1,500 to 4,000 Oe and an Hc/HK ratio of Hc to an anisotropy field, HK, of from 0.30 to 1.00.

摘要翻译： 描述了一种磁记录介质，其包括至少在其上设置有分散在粘合剂中的铁磁性金属颗粒的磁性层的非磁性载体，其中该磁性层具有1,500至4000ee的矫顽力Hc和Hc / HK Hc与各向异性场的比值HK为0.30〜1.00。

公开(公告)号：US5693397A

公开(公告)日：1997-12-02

申请号：US581338

申请日：1995-12-29

申请人： Shinji Saito ,  Nobuo Yamazaki ,  Hitoshi Noguchi

发明人： Shinji Saito ,  Nobuo Yamazaki ,  Hitoshi Noguchi

IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  G11B5/706

CPC分类号： G11B5/70 ,  G11B5/70678 ,  Y10S428/90 ,  Y10T428/257 ,  Y10T428/265

摘要： A disk-form magnetic recording medium is described, comprising a nonmagnetic support having provided thereon at least one magnetic layer comprising a binder and hexagonal ferrite magnetic particles dispersed therein, wherein the magnetic layer has an in-plane coercive force Hc of 1,200 to 3,000 Oe, an anisotropy field H.sub.k of more than 3000 Oe, an Hc/Hk ratio of 0.25 or higher, an in-plane orientation ratio of 0.8 or higher, and a vertical-direction squareness ratio calculated through diamagnetic correction of lower than 0.6.

摘要翻译： 描述了一种盘形磁记录介质，包括其上设置有至少一个包含粘合剂的磁性层和分散在其中的六方晶系铁氧体磁性颗粒的非磁性载体，其中磁性层的面内矫顽力Hc为1,200〜3,000Oe ，大于3000Oe的各向异性场Hk，Hc / Hk比为0.25以上，面内取向比为0.8以上，通过反磁性校正计算出的垂直方向的立方度比低于0.6。

公开(公告)号：US20060024533A1

公开(公告)日：2006-02-02

申请号：US11237973

申请日：2005-09-29

申请人： Shinji Saito ,  Hitoshi Noguchi ,  Nobuo Yamazaki

发明人： Shinji Saito ,  Hitoshi Noguchi ,  Nobuo Yamazaki

IPC分类号： G11B5/708

CPC分类号： G11B5/70678 ,  G11B5/70 ,  G11B5/714

摘要： Provided is a magnetic recording medium exhibiting good electromagnetic characteristics in high-density recording The magnetic recording medium employed for magnetically recording signals with a track width equal to or less than 2.0 μm and reproducing the magnetically recorded signals, wherein said magnetic recording medium comprises a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder or comprises a nonmagnetic layer comprise a nonmagnetic powder and a binder and a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder in this order on a nonmagnetic support. Said magnetic layer has a thickness equal to or less than 0.2 μm, and said hexagonal ferrite ferromagnetic powder has an average plate diameter being 1/30 or less of the magnetically recorded track width as well as ½ or less of the thickness of the magnetic layer.

公开(公告)号：US06855394B2

公开(公告)日：2005-02-15

申请号：US10178764

申请日：2002-06-25

申请人： Hitoshi Noguchi ,  Nobuo Yamazaki ,  Shinji Saito

发明人： Hitoshi Noguchi ,  Nobuo Yamazaki ,  Shinji Saito

IPC分类号： G11B5/70 ,  G11B5/706 ,  G11B5/708

CPC分类号： G11B5/706 ,  G11B5/7085 ,  Y10T428/24355 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/265

摘要： A magnetic recording medium is disclosed, comprising a support having provided thereon a substantially nonmagnetic lower layer by coating a lower layer coating solution comprising a nonmagnetic powder dispersed in a binder and drying, and a layer having a thickness of from 0.01 to 0.15 μm by coating a magnetic layer coating solution comprising a ferromagnetic metal powder or a hexagonal ferrite powder dispersed in a binder, wherein the magnetic layer contains diamond particles having an average particle size of from 1/5 to 2 times the thickness of the magnetic layer in an amount of from 0.1 to 5.0 mass % based on the ferromagnetic metal powder.

摘要翻译： 公开了一种磁记录介质，其包括通过涂布包含分散在粘合剂中的非磁性粉末的下层涂布溶液和干燥而在其上设置有基本上非磁性的下层的载体，以及通过涂布具有0.01至0.15μm厚度的层 包含分散在粘合剂中的铁磁性金属粉末或六方铁氧体粉末的磁性层涂布液，其中所述磁性层含有平均粒度为磁性层厚度的1/5至2倍的金刚石颗粒，其量为 基于强磁性金属粉末为0.1〜5.0质量％。