公开(公告)号：US20070217047A1

公开(公告)日：2007-09-20

申请号：US11716007

申请日：2007-03-09

申请人： Kenji Ichikawa ,  Toshihiro Usa ,  Kazuhiro Niitsuma ,  Tadashi Yasunaga ,  Sumio Kuroda ,  Tsugito Maruyama

发明人： Kenji Ichikawa ,  Toshihiro Usa ,  Kazuhiro Niitsuma ,  Tadashi Yasunaga ,  Sumio Kuroda ,  Tsugito Maruyama

IPC分类号： G11B5/86 ,  G11B5/82

CPC分类号： G11B5/865 ,  B82Y10/00 ,  G11B5/743 ,  G11B5/82

摘要： An aspect of the present invention provides a master medium for perpendicular magnetic transfer, comprising: a disk-like substrate on a surface of which a plurality of protruding magnetic-layer patterns corresponding to information to be transferred to a magnetic recording medium targeted for transfer are formed. In the master medium for perpendicular magnetic transfer, a ratio of a circumferential width L of the protruding magnetic-layer patterns to a circumferential gap S between the protruding magnetic-layer patterns is L/S

摘要翻译： 本发明的一个方面提供了一种用于垂直磁转移的主介质，其特征在于，包括：一个表面上的盘状衬底，其中多个突出的磁性层图案对应于要传送到用于传送的磁记录介质的信息 形成。 在用于垂直磁转移的主介质中，突出磁层图案的周向宽度L与突出磁层图案之间的周向间隙S的比率为L / S <1。 根据本发明的方面，可以进行良好的磁转移，因此可以获得没有缺陷并具有良好C / N比的垂直磁记录介质（从盘）。 另外，可以进行良好的磁转移。

公开(公告)号：US20080062548A1

公开(公告)日：2008-03-13

申请号：US11851441

申请日：2007-09-07

申请人： Naoto Fujiwara ,  Kenji Sugiyama ,  Kazuhiro Niitsuma ,  Tadashi Yasunaga ,  Tsugito Maruyama ,  Sumio Kuroda ,  Yutaka Nakamura ,  Hiroyuki Suzuki

发明人： Naoto Fujiwara ,  Kenji Sugiyama ,  Kazuhiro Niitsuma ,  Tadashi Yasunaga ,  Tsugito Maruyama ,  Sumio Kuroda ,  Yutaka Nakamura ,  Hiroyuki Suzuki

IPC分类号： G11B5/86 ,  G11B5/82

CPC分类号： G11B5/865

摘要： The present invention provides a master recording medium, a magnetic transfer method, a magnetic transfer apparatus, and a magnetic recording medium and a magnetic recording and reproducing apparatus thereby made, which are capable of obtaining a good regenerative signal with few even harmonic components such as the second-order harmonic components on reproducing the information transferred to the magnetic recording medium in the case of recording the information on the magnetic recording medium having a magnetic layer composed of the perpendicular magnetization film by the magnetic transfer.

摘要翻译： 本发明提供了一种能够获得良好再生信号的主记录介质，磁转移方法，磁转移装置和磁记录介质以及由此制成的磁记录和再现装置，其具有很少的偶次谐波分量，例如 在通过磁转移将由垂直磁化膜组成的磁性层记录在磁记录介质上的情况下，再现传送到磁记录介质的信息的二次谐波分量。

公开(公告)号：US07094481B2

公开(公告)日：2006-08-22

申请号：US10958327

申请日：2004-10-06

申请人： Masakazu Nishikawa ,  Kazuhiro Niitsuma ,  Tadashi Yasunaga ,  Toshihiro Usa ,  Kazunori Komatsu

发明人： Masakazu Nishikawa ,  Kazuhiro Niitsuma ,  Tadashi Yasunaga ,  Toshihiro Usa ,  Kazunori Komatsu

IPC分类号： G11B5/64 ,  G11B5/86

CPC分类号： B82Y10/00 ,  G11B5/59633 ,  G11B5/743 ,  G11B5/82 ,  G11B5/865 ,  Y10T428/273

摘要： A master information carrier for magnetic transfer to an in-plane magnetic recording medium includes a base sheet having an irregularity pattern representing information to be transferred to an in-plane magnetic recording medium and a magnetic layer formed along the irregularity pattern. The thickness da1 of the magnetic layer on the upper surface of a protruding portion of the irregularity pattern and the thickness da2 of the magnetic layer on each of the side surfaces of the protruding portion satisfy the following condition, 0.05

摘要翻译： 用于磁传递到平面内磁记录介质的主信息载体包括具有表示要传送到平面内磁记录介质的信息的不规则图案的基片和沿着不规则图案形成的磁性层。 不规则图案的突出部分的上表面上的磁性层的厚度da 1和突出部分的每个侧表面上的磁性层的厚度da 2满足以下条件： 公式描述=“内联公式”end =“lead”？> 0.05

公开(公告)号：US06816327B2

公开(公告)日：2004-11-09

申请号：US10304998

申请日：2002-11-27

申请人： Masakazu Nishikawa ,  Kazuhiro Niitsuma ,  Tadashi Yasunaga ,  Toshihiro Usa ,  Kazunori Komatsu

发明人： Masakazu Nishikawa ,  Kazuhiro Niitsuma ,  Tadashi Yasunaga ,  Toshihiro Usa ,  Kazunori Komatsu

IPC分类号： G11B586

CPC分类号： B82Y10/00 ,  G11B5/59633 ,  G11B5/743 ,  G11B5/82 ,  G11B5/865 ,  Y10T428/273

摘要： A master information carrier for magnetic transfer to an in-plane magnetic recording medium includes a base sheet having an irregularity pattern representing information to be transferred to an in-plane magnetic recording medium and a magnetic layer formed along the irregularity pattern. The thickness da1 of the magnetic layer on the upper surface of a protruding portion of the irregularity pattern and the thickness da2 of the magnetic layer on each of the side surfaces of the protruding portion satisfy the following condition, 0.05

公开(公告)号：US06911270B2

公开(公告)日：2005-06-28

申请号：US10317111

申请日：2002-12-12

申请人： Masakazu Nishikawa ,  Kazuhiro Niitsuma ,  Tadashi Yasunaga ,  Toshihiro Usa ,  Kazunori Komatsu

发明人： Masakazu Nishikawa ,  Kazuhiro Niitsuma ,  Tadashi Yasunaga ,  Toshihiro Usa ,  Kazunori Komatsu

IPC分类号： G11B5/82 ,  G11B5/86 ,  G11B5/64

CPC分类号： B82Y10/00 ,  G11B5/743 ,  G11B5/82 ,  G11B5/865 ,  Y10T428/12986 ,  Y10T428/24479 ,  Y10T428/2495 ,  Y10T428/31

摘要： A master information carrier for magnetic transfer includes a base sheet which is formed of a magnetic material. The master information carrier is provided with an irregularity pattern representing information to be transferred to a magnetic recording medium and a magnetic layer formed along the irregularity pattern. The saturation magnetization Mm of the magnetic layer and the saturation magnetization Ms of the base sheet satisfy the condition 1.0

摘要翻译： 用于磁转移的主信息载体包括由磁性材料形成的基片。 主信息载体具有表示要传送到磁记录介质的信息的不规则图案和沿着不规则图案形成的磁性层。 磁性层的饱和磁化强度Mm和基片的饱和磁化强度Ms满足条件<？in-line-formula description =“In-line Formulas”end =“lead”？> 1.0

公开(公告)号：US07149042B2

公开(公告)日：2006-12-12

申请号：US11014944

申请日：2004-12-20

申请人： Masakazu Nishikawa ,  Tadashi Yasunaga ,  Kazuhiro Niitsuma

发明人： Masakazu Nishikawa ,  Tadashi Yasunaga ,  Kazuhiro Niitsuma

IPC分类号： G11B5/86

CPC分类号： B82Y10/00 ,  G11B5/59633 ,  G11B5/743 ,  G11B5/82 ,  G11B5/865

摘要： A master carrier for magnetic transfer is equipped with a substrate having a land/groove pattern. The land/groove pattern is formed from a magnetic material and corresponds to information that is transferred to a magnetic recording disk. Each land in the land/groove pattern has four round corners whose radius is from 1% through 47% of the width of a data track on the disk.

公开(公告)号：US07465383B2

公开(公告)日：2008-12-16

申请号：US11103605

申请日：2005-04-12

申请人： Kazuhiro Niitsuma ,  Masakazu Nishikawa ,  Tadashi Yasunaga

发明人： Kazuhiro Niitsuma ,  Masakazu Nishikawa ,  Tadashi Yasunaga

IPC分类号： B29D17/00

CPC分类号： B82Y10/00 ,  G11B5/743 ,  G11B5/82 ,  G11B5/8404 ,  G11B5/858 ,  G11B5/865 ,  Y10T428/214

摘要： A master information carrier for magnetic transfer includes a master substrate made of metal, including an embossed pattern corresponding to information to be transferred. The master substrate is produced by laminating a metal disk with a predetermined thickness on an original disk, on which an embossed pattern is formed, by electroforming, peeling off the metal disk and die-cutting a disk in a desired size. An outer diameter of the metal disk is at least 1.7 times longer than an outer diameter of the die-cut master substrate. When the metal disk is peeled off from the original disk, deformation due to the forces acting from the side of the outer circumference is reduced. The flatness of the metal disk is ensured and the transfer qualities are improved. Further, a step of removing distortion of the metal disk, caused at the time of peeling off the metal disk, may also be provided.

摘要翻译： 用于磁转移的主信息载体包括由金属制成的母基板，包括对应于要传送的信息的压花图案。 通过电铸，剥离金属盘并以期望的尺寸对盘进行模切，将原始盘上形成有预定厚度的金属盘层叠在其上形成压花图案的母板上制造母版衬底。 金属盘的外径比模切母版基板的外径长至少1.7倍。 当金属盘从原始盘剥离时，由于从外周侧作用的力的变形减小。 确保金属盘的平坦度，提高转印质量。 此外，还可以提供在剥离金属盘时引起的去除金属盘的变形的步骤。

公开(公告)号：US20050111124A1

公开(公告)日：2005-05-26

申请号：US11014944

申请日：2004-12-20

申请人： Masakazu Nishikawa ,  Tadashi Yasunaga ,  Kazuhiro Niitsuma

发明人： Masakazu Nishikawa ,  Tadashi Yasunaga ,  Kazuhiro Niitsuma

IPC分类号： G11B5/596 ,  G11B5/82 ,  G11B5/86

CPC分类号： B82Y10/00 ,  G11B5/59633 ,  G11B5/743 ,  G11B5/82 ,  G11B5/865

摘要： A master carrier for magnetic transfer is equipped with a substrate having a land/groove pattern. The land/groove pattern is formed from a magnetic material and corresponds to information that is transferred to a magnetic recording disk. Each land in the land/groove pattern has four round corners whose radius is from 1% through 47% of the width of a data track on the disk.

公开(公告)号：US07187510B2

公开(公告)日：2007-03-06

申请号：US10322415

申请日：2002-12-19

申请人： Tadashi Yasunaga ,  Kazuhiro Niitsuma

发明人： Tadashi Yasunaga ,  Kazuhiro Niitsuma

IPC分类号： G11B5/86

CPC分类号： G11B5/865

摘要： A signal such as a servo tracking signal is recorded on a flexible slave medium by magnetic transfer. When forming the flexible slave medium of a magnetic strip in a continuous length, the signal is recorded on the magnetic strip by patterned master magnetic transfer prior to or simultaneously with shaping the magnetic strip into a desired shape.

摘要翻译： 诸如伺服跟踪信号的信号通过磁传输记录在柔性从属介质上。 当以连续长度形成磁条的柔性从属介质时，在将磁条成形为所需形状之前或同时将信号通过图案化母磁传输记录在磁条上。

公开(公告)号：US20060082913A1

公开(公告)日：2006-04-20

申请号：US11251839

申请日：2005-10-18

申请人： Kazuhiro Niitsuma ,  Makoto Nagao ,  Tadashi Yasunaga

发明人： Kazuhiro Niitsuma ,  Makoto Nagao ,  Tadashi Yasunaga

IPC分类号： G11B5/09 ,  G11B5/86 ,  G11B5/596

CPC分类号： G11B5/865

摘要： Magnetic field absorbing regions, composed of protrusions or magnetic layers, are provided in an amplitude servo transfer pattern of a patterned master carrier for magnetic transfer. The magnetic field absorbing regions are provided in intermediate tracks between burst bit elements that constitute burst bit strings, which are provided adjacent to each other in a track width direction. The amplitude servo transfer pattern in magnetically transferred onto a magnetic recording medium. Portions of the magnetic recording medium corresponding to the magnetic field absorbing regions become magnetically non-inverted regions. Therefore, noise is not recorded, and servo tracking can be favorably performed.

摘要翻译： 磁性吸收区域由突起或磁性层构成，以图形化主载体的振幅伺服转印图案提供磁传递。 磁场吸收区域设置在构成突发位串的突发位元件之间的中间轨道中，这些突发位元件沿轨道宽度方向彼此相邻地设置。 磁转移到磁记录介质上的振幅伺服转印图案。 对应于磁场吸收区域的磁记录介质的部分变成非磁性非倒置区域。 因此，不会记录噪声，可以有利地执行伺服跟踪。