公开(公告)号：US06829201B2

公开(公告)日：2004-12-07

申请号：US10023832

申请日：2001-12-21

申请人： Masakazu Nishikawa ,  Kazuyuki Usuki ,  Yoshihisa Usami ,  Makoto Nagao

发明人： Masakazu Nishikawa ,  Kazuyuki Usuki ,  Yoshihisa Usami ,  Makoto Nagao

IPC分类号： G11B1100

CPC分类号： G11B5/865 ,  B82Y10/00 ,  G11B5/5526 ,  G11B5/59677 ,  G11B5/743 ,  G11B5/82 ,  G11B5/825 ,  G11B11/10526 ,  G11B11/10565 ,  G11B11/10576 ,  G11B11/10578 ,  G11B11/10582 ,  G11B2005/0021

摘要： There are provided an information recording medium which permits accurate tracking servo, and a method for recording and reproducing for an information recording medium which allows recording and reproducing of a signal at a favorable S/N by carrying out at least one of information recording and information reproduction while accurately performing tracking servo. A magneto-optic disk includes a magnetic recording layer for magnetically recording information. The magnetic recording layer is in advance magnetized for concentrically or spirally around the center of the disk in such a manner that magnetized regions are disposed such that adjacent regions are magnetized in different directions and alternately arranged in the radial direction of the disk. Accordingly, tracking can be continuously performed and accurate tracking servo can also be performed.

摘要翻译： 提供了一种允许精确跟踪伺服的信息记录介质，以及一种用于信息记录介质的记录和再现方法，该信息记录介质允许通过执行信息记录和信息中的至少一个来以良好的S / N记录和再现信号 正确执行跟踪伺服时再现。 磁光盘包括用于磁记录信息的磁记录层。 磁记录层预先被磁化以围绕盘的中心同心或螺旋地以磁化区域被布置成使得相邻区域沿不同方向被磁化并且沿盘的径向方向交替布置。 因此，可以连续执行跟踪，并且还可以执行精确的跟踪伺服。

公开(公告)号：US06977786B2

公开(公告)日：2005-12-20

申请号：US10264343

申请日：2002-10-04

申请人： Kazuyuki Usuki ,  Masakazu Nishikawa ,  Makoto Nagao

发明人： Kazuyuki Usuki ,  Masakazu Nishikawa ,  Makoto Nagao

IPC分类号： G11B5/82 ,  G11B5/02 ,  G11B5/596 ,  G11B5/86 ,  G11B13/00

CPC分类号： G11B5/59677 ,  G11B5/59611 ,  G11B5/865

摘要： In an information recording method of the present invention by carrying out recording data while carrying out tracking servo accurately, high density recording of signals at a good S/N can be carried out, and high density recording by a vertical magnetic recording system can be carried out. A magnetic disk comprises a magnetic recording layer, and the magnetic recording layer is magnetized in advance such that magnetized regions A and B having different magnetization directions are formed. At a time of recording data, vertical magnetic recording is carried out by a magnetic head while carrying out accurate tracking servo by optically tracking by a magneto-optical effect utilizing a difference in the magnetization directions of the magnetized regions A and B. Therefore, high-density recording at a good S/N is possible.

摘要翻译： 在本发明的信息记录方法中，通过在精确地执行跟踪伺服的同时执行记录数据，可以进行具有良好S / N的信号的高密度记录，并且可以承载通过垂直磁记录系统的高密度记录 出来 磁盘包括磁记录层，磁记录层被预先磁化，从而形成磁化方向不同的磁化区域A和B. 在记录数据时，通过利用磁化区域A和B的磁化方向上的差异的磁光效应通过光学跟踪进行精确的跟踪伺服，由磁头执行垂直磁记录。因此，高 在良好的S / N下的密度记录是可能的。

公开(公告)号：US07112376B2

公开(公告)日：2006-09-26

申请号：US10753366

申请日：2004-01-09

申请人： Kenichi Moriwaki ,  Kazuyuki Usuki ,  Masakazu Nishikawa

发明人： Kenichi Moriwaki ,  Kazuyuki Usuki ,  Masakazu Nishikawa

IPC分类号： G11B5/66 ,  G11B5/70

CPC分类号： G11B5/7325 ,  G11B5/656 ,  Y10S428/90 ,  Y10T428/12854

摘要： A magnetic recording medium comprising; a nonmagnetic support; a first under layer which is constituted by a nonmetal element, per se, a compound consisting of nonmetal elements, or a compound containing titanium and a nonmetal element; a second under layer containing at least one element selected from the group consisting of chromium, titanium, iridium, platinum, palladium, ruthenium, rhodium, rhenium and osmium; and a magnetic layer which contains a ferromagnetic metal alloy containing at least cobalt, platinum and chromium, and a nonmagnetic compound, in this order.

摘要翻译： 一种磁记录介质，包括： 非磁性支撑; 由非金属元素本身构成的第一底层，由非金属元素组成的化合物或包含钛和非金属元素的化合物; 含有选自铬，钛，铱，铂，钯，钌，铑，铼和锇中的至少一种元素的第二下层; 以及含有至少含有钴，铂，铬的铁磁性金属合金和非磁性化合物的磁性层。

公开(公告)号：US06587289B2

公开(公告)日：2003-07-01

申请号：US09928482

申请日：2001-08-14

申请人： Masakazu Nishikawa ,  Kazuyuki Usuki ,  Masashi Aoki

发明人： Masakazu Nishikawa ,  Kazuyuki Usuki ,  Masashi Aoki

IPC分类号： G11B586

CPC分类号： G11B5/865 ,  G11B23/505

摘要： A magnetic transfer method for magnetically transferring information signals such as servo signals from a master medium to a slave medium, capable of reducing a range of signal missing due to insufficient contact of the two mediums originating from an adhering substance, thus enhancing signal quality. When the master medium bearing an information signal and the slave medium are brought into close contact with each other, a transferring magnetic field is applied thereto, thus magnetically transferring the information signal from the master medium to the slave medium. An elastic member made of a material having an elastic property so as to deform in accordance with a surface shape of the slave medium during contact pressure application and to restore to an original surface shape thereof during release of the slave medium from the master medium can be interposed between a back of the slave medium and a pressing surface of a pressing support member.

公开(公告)号：US06678101B2

公开(公告)日：2004-01-13

申请号：US10268685

申请日：2002-10-11

申请人： Masakazu Nishikawa ,  Kazuyuki Usuki ,  Masashi Aoki

发明人： Masakazu Nishikawa ,  Kazuyuki Usuki ,  Masashi Aoki

IPC分类号： G11B586

CPC分类号： G11B5/865 ,  G11B23/505

摘要： A magnetic transfer method for magnetically transferring information signals such as servo signals from a master medium to a slave medium, capable of reducing a range of signal missing due to insufficient contact of the two mediums originating from an adhering substance, thus enhancing signal quality. When the master medium bearing an information signal and the slave medium are brought into close contact with each other, a transferring magnetic field is applied thereto, thus magnetically transferring the information signal from the master medium to the slave medium. An elastic member made of a material having an elastic property so as to deform in accordance with a surface shape of the slave medium during contact pressure application and to restore to an original surface shape thereof during release of the slave medium from the master medium can be interposed between a back of the slave medium and a pressing surface of a pressing support member.

摘要翻译： 一种磁传递方法，用于将诸如伺服信号的信息信号从主介质传送到从属介质，能够减少由于粘附物质引起的两种介质的接触不足引起的信号丢失范围，从而提高信号质量。 当承载信息信号的主介质和从属介质彼此紧密接触时，向其施加转移磁场，从而将信息信号从主介质磁传输到从介质。 弹性构件由具有弹性的材料制成，以便在接触压力施加期间根据从属介质的表面形状变形并且在从介质从主介质释放期间恢复其原始表面形状时可以是 插入从属介质的背面和按压支撑构件的按压面之间。

公开(公告)号：US07385774B2

公开(公告)日：2008-06-10

申请号：US11087649

申请日：2005-03-24

申请人： Masakazu Nishikawa ,  Makoto Nagao

发明人： Masakazu Nishikawa ,  Makoto Nagao

IPC分类号： G11B5/86

CPC分类号： B82Y10/00 ,  G11B5/59688 ,  G11B5/743 ,  G11B5/865

摘要： A master information carrier for magnetic transfer bears uneven signal patterns on its surface. When the minimum bit length in the uneven signal patterns is Bmin, dummy uneven patterns are provided in a depression of the uneven signal patterns, which has a length of 4Bmin or longer in the direction along a track. When magnetic transfer is performed, magnetized patterns corresponding to the dummy uneven patterns are transferred onto a slave medium. The magnetized patterns are patterns which will not be recognized as reproduction signals at a drive, into which the slave medium after magnetic transfer will be loaded.

摘要翻译： 用于磁转移的主信息载体在其表面上具有不均匀的信号图案。 当不均匀信号图案中的最小位长度为B 时，在不均匀信号图案的凹陷中提供虚设不均匀图案，其长度为4B分钟或 沿着轨道的方向更长。 当进行磁转移时，对应于虚拟不均匀图案的磁化图案被转移到从属介质上。 磁化图案是在驱动器处将不被识别为再现信号的图案，磁传输之后的从介质将被加载到该驱动器中。

公开(公告)号：US06906875B2

公开(公告)日：2005-06-14

申请号：US10144024

申请日：2002-05-14

申请人： Akito Kamatani ,  Masakazu Nishikawa ,  Makoto Nagao ,  Kazunori Komatsu ,  Tsuneo Inui ,  Kazuhiro Niitsuma

发明人： Akito Kamatani ,  Masakazu Nishikawa ,  Makoto Nagao ,  Kazunori Komatsu ,  Tsuneo Inui ,  Kazuhiro Niitsuma

IPC分类号： G11B5/00 ,  G11B5/86 ,  G11B23/50

CPC分类号： G11B5/865 ,  G11B23/505 ,  G11B2005/001

摘要： A magnetic transfer device for bringing a master carrier with information and a slave medium into intimate contact with each other and then applying a transfer field to transfer the information to the slave medium. The master carrier has an inclined face on its radially outer end. After the magnetic transfer of the information, claws are inserted in the gas formed by the inclined face of the master carrier and the slave medium. The slave medium held in intimate contact with the master carrier is separated from the master carrier by lifting the slave medium with the claws.

摘要翻译： 一种用于使具有信息的主载波与从属介质彼此紧密接触，然后施加传送场以将信息传送到从属介质的磁传输装置。 主托架在其径向外端具有倾斜面。 在信息的磁传递之后，将爪插入由主载体和从属介质的倾斜面形成的气体中。 与主托架保持紧密接触的从属介质通过用爪提起从属介质与主托架分离。

公开(公告)号：US06865038B2

公开(公告)日：2005-03-08

申请号：US09994891

申请日：2001-11-28

申请人： Masakazu Nishikawa ,  Makoto Nagao

发明人： Masakazu Nishikawa ,  Makoto Nagao

IPC分类号： G11B5/596 ,  G11B5/84 ,  G11B5/86 ,  G11B23/50

CPC分类号： G11B5/865 ,  G11B5/596 ,  G11B5/84 ,  G11B23/505

摘要： In the magnetic transferring method for magnetically transferring an information signal such as a servo signal from the master medium to the slave medium, when magnetic transfer is performed by bringing a master medium and a slave medium into close contact with each other, the master medium bearing an information signal and the slave medium having a lubricating layer formed on the surface of its recording plane during use, and applying a transfer magnetic field, the magnetic transfer is performed by bringing the slave medium before the formation of the lubricating layer and the master medium into close contact with each other. Thus, the separation of the slave medium from the master medium after the magnetic transfer is facilitated, and the adsorption of dust on the slave medium is prevented.

摘要翻译： 在用于将诸如伺服信号的信息信号从主介质磁传送到从属介质的磁转移方法中，当通过使主介质和从属介质彼此紧密接触进行磁传输时，主介质轴承 信息信号和从属介质，其在使用期间在其记录面的表面上形成有润滑层，并施加转移磁场，通过在形成润滑层和主介质之前使从属介质进行磁转移 彼此紧密接触。 因此，便于磁传送后从属介质与主介质的分离，并且防止灰尘在从属介质上的吸附。

公开(公告)号：US06833173B1

公开(公告)日：2004-12-21

申请号：US09670616

申请日：2000-09-27

申请人： Masakazu Nishikawa ,  Makoto Nagao

发明人： Masakazu Nishikawa ,  Makoto Nagao

IPC分类号： G11B566

CPC分类号： G11B5/732 ,  G11B5/656 ,  G11B5/7325 ,  Y10T428/2495 ,  Y10T428/265 ,  Y10T428/266 ,  Y10T428/269 ,  Y10T428/31721 ,  Y10T428/31725

摘要： A magnetic recording medium, which comprises a flattening layer with a thickness of 0.1-5.0 &mgr;m, a seed layer, a nonmagnetic primer layer containing chromium with a chromium concentration of 77-100 atom %, a Co—Cr type alloy magnetic layer, a protective layer, and a lubricating layer coated sequentially on at least one of the surfaces of a flexible nonmagnetic support member, whereby the seed layer is designed in such a manner that the linear expansion coefficient (ESE) of the seed layer and the linear expansion coefficient (EUL) of the nonmagnetic primer layer satisfy the relation: |ESE−EUL|/EUL 1.

摘要翻译： 一种磁记录介质，其包括厚度为0.1-5.0μm的压平层，种子层，含铬浓度为77-100原子％的铬的非磁性底漆层，Co-Cr型合金磁性层， 保护层和润滑层，其依次涂覆在柔性非磁性支撑构件的至少一个表面上，由此种子层被设计成使种子层的线性膨胀系数（ESE）和线性膨胀系数 （EUL）满足关系：| ESE-EUL | / EUL <0.3，种子层的拉伸强度（SSE）和非磁性底漆层的拉伸强度（SUL）满足关系式：SSE / SUL> 1。

公开(公告)号：US06636371B1

公开(公告)日：2003-10-21

申请号：US09558326

申请日：2000-04-26

申请人： Kazunori Komatsu ,  Makoto Nagao ,  Masakazu Nishikawa

发明人： Kazunori Komatsu ,  Makoto Nagao ,  Masakazu Nishikawa

IPC分类号： G11B586

CPC分类号： G11B5/865

摘要： The invention provides a magnetic transfer method in which a magnetic transfer master carrier having a magnetic layer at a surface portion of a substrate having an information signal is brought in contact with a magnetic recording medium that is an associated slave medium and a transfer magnetic field is applied to the slave medium. The coercive force Hcs of the slave magnetic recording medium and the transfer magnetic field satisfies the relation: 0.6×Hcs≦transfer magnetic field≦1.3×Hcs

摘要翻译： 本发明提供一种磁转移方法，其中在具有信息信号的基板的表面部分具有磁性层的磁转移主载体与作为相关联的从动介质的磁记录介质和转印磁场接触 应用于从属媒体。 从属磁记录介质的矫顽力Hcs和转移磁场满足关系：0.6xHcs <=传递磁场<= 1.3XHCS