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15 条记录 (耗时 0.013 秒)

    Magnetic disk drive including read channel for processing differentiated read signal
    3.
    发明授权
    Magnetic disk drive including read channel for processing differentiated read signal 失效
    磁盘驱动器包括用于处理差分读取信号的读取通道

    公开(公告)号：US06894855B2

    公开(公告)日：2005-05-17

    申请号：US10228323

    申请日：2002-08-27

    申请人： Yuka Aoyagi ,  Akihiko Takeo

    发明人： Yuka Aoyagi ,  Akihiko Takeo

    IPC分类号： G11B5/65 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B5/39 ,  G11B5/667

    CPC分类号： B82Y10/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B2005/0016 ,  G11B2005/0029

    摘要： A disk drive of perpendicular magnetic recording method including a read head comprising a GMR element and a drive using a double-layered disk medium, is disclosed. In the magnetic field response characteristic of the GMR element, the relationship between the degree of nonlinearity and a pulse width at 50% threshold (PW50) of a differentiated read signal is used. The degree of nonlinearity of the GMR element is adjusted such that the PW50 is smaller than the maximum value. The read channel comprises a differentiation circuit for converting the read signal output from the GMR element into the differentiated read signal.

    摘要翻译： 公开了一种包括具有GMR元件的读取头和使用双层盘介质的驱动器的垂直磁记录方法的磁盘驱动器。 在GMR元件的磁场响应特性中，使用非线性度与微分读信号的50％阈值（PW50）之间的脉冲宽度之间的关系。 调整GMR元件的非线性度使得PW50小于最大值。 读通道包括用于将从GMR元件输出的读取信号转换为差分读取信号的微分电路。

    Magnetic disk apparatus
    5.
    发明申请
    Magnetic disk apparatus 审中-公开
    磁盘装置

    公开(公告)号：US20060139794A1

    公开(公告)日：2006-06-29

    申请号：US11312439

    申请日：2005-12-21

    申请人： Yuka Aoyagi

    发明人： Yuka Aoyagi

    IPC分类号： G11B5/012 ,  G11B17/00

    CPC分类号： G11B5/11 ,  G11B5/667 ,  G11B2005/0029

    摘要： A magnetic disk apparatus includes a magnetic recording media having a substrate, a data recording layer formed on one surface of the substrate and including a magnetic recording layer, and a shield layer formed on the other surface of the substrate and including a soft magnetic layer and no magnetic recording layer, and a magnetic head.

    摘要翻译： 磁盘装置包括具有基板的磁记录介质，形成在基板的一个表面上并包括磁记录层的数据记录层，以及形成在基板的另一表面上并包括软磁层和 无磁记录层和磁头。

    Method and apparatus for write compensation of perpendicular magnetic recording in disk drive
    6.
    发明授权
    Method and apparatus for write compensation of perpendicular magnetic recording in disk drive 有权
    磁盘驱动器中垂直磁记录写入补偿的方法和装置

    公开(公告)号：US06903890B2

    公开(公告)日：2005-06-07

    申请号：US10097327

    申请日：2002-03-15

    申请人： Yuka Aoyagi ,  Akihiko Takeo

    发明人： Yuka Aoyagi ,  Akihiko Takeo

    IPC分类号： G11B5/00 ,  G11B5/02 ,  G11B5/09 ,  G11B20/10 ,  G11B20/24

    CPC分类号： G11B20/10212 ,  G11B5/09 ,  G11B20/10194 ,  G11B20/24 ,  G11B2005/0029

    摘要： There is disclosed a write compensator which suppresses bit shift caused by distortion of a read signal waveform of a read head in a disk drive adopting a perpendicular magnetic recording system. The write compensator executes write compensation during recording data based on the known relationship between bit shift which is beyond an allowable range and a pattern of a data bit string of a data signal. A write amplifier converts the write-compensated data signal into an electrical signal by using the write compensator so as to suppress the bit shift, and supplies it to a write head.

    摘要翻译： 公开了一种写补偿器，其抑制由采用垂直磁记录系统的盘驱动器中的读头的读信号波形的失真引起的位移。 写补偿器基于超出允许范围的位移与数据信号的数据位串的模式之间的已知关系在记录数据期间执行写补偿。 写入放大器通过使用写补偿器将写补偿数据信号转换成电信号，以便抑制位移，并将其提供给写头。

    Perpendicular recording magnetic disk apparatus
    7.
    发明授权
    Perpendicular recording magnetic disk apparatus 失效
    垂直记录磁盘装置

    公开(公告)号：US07289293B2

    公开(公告)日：2007-10-30

    申请号：US10992850

    申请日：2004-11-22

    申请人： Yuka Aoyagi

    发明人： Yuka Aoyagi

    IPC分类号： G11B5/012 ,  G11B5/82

    CPC分类号： G11B5/82 ,  G11B5/012 ,  G11B5/1278 ,  G11B2005/0008 ,  G11B2005/001 ,  G11B2005/0016 ,  G11B2005/0029

    摘要： A perpendicular recording magnetic disk apparatus has a perpendicular two-layered medium including a pinning layer, a soft underlayer and a perpendicular recording layer, and a write head including a main pole, a return yoke and an exciting coil. In this apparatus, a magnetization recoverable magnetic field Hexf by which the pinning layer and the soft underlayer ensure a magnetization recovery ratio of 1 is larger than a magnetic field applied by the write head to the pinning layer.

    摘要翻译： 垂直记录磁盘装置具有包括钉扎层，软底层和垂直记录层的垂直双层介质，以及包括主极，返回轭和励磁线圈的写入头。 在该装置中，钉扎层和软底层确保磁化恢复率为1的磁化可恢复磁场H ex大于由写头施加到钉扎层的磁场。

    Disk drive
    8.
    发明授权
    Disk drive 失效
    磁盘驱动器

    公开(公告)号：US06930843B2

    公开(公告)日：2005-08-16

    申请号：US09949625

    申请日：2001-09-12

    申请人： Yuka Aoyagi ,  Akihiko Takeo ,  Tomoko Taguchi

    发明人： Yuka Aoyagi ,  Akihiko Takeo ,  Tomoko Taguchi

    IPC分类号： G11B5/667 ,  G11B5/00 ,  G11B5/012 ,  G11B19/04 ,  G11B21/12 ,  G11B27/36 ,  G11B21/02

    CPC分类号： G11B21/12 ,  G11B5/012 ,  G11B19/04 ,  G11B27/36 ,  G11B2005/001 ,  G11B2220/20

    摘要： There is disclosed a disk drive provided with a function of suspending a read/write operation in the case where the magnetic field of the magnetic disturbance out of the predetermined range is generated. The disk drive has a head writing data to the disk, a sensor detecting a magnetic field with respect to the disk drive, and an actuator unloading the head from the surface of the disk to a retracting position outside of the disk when the detected magnetic field is out of a predetermined range.

    摘要翻译： 公开了一种磁盘驱动器，其具有在产生磁干扰的磁场超出预定范围的情况下暂停读/写操作的功能。 磁盘驱动器具有写入盘的数据头，相对于磁盘驱动器检测磁场的传感器，以及将磁头从磁盘表面卸载到盘外部的缩回位置的致动器，当检测到的磁场 超出预定范围。

    Perpendicular Magnetic Recording Medium Using Soft Magnetic Layer Which Suppresses Noise Generation, And Perpendicular Magnetic Recording Apparatus Therewith
    10.
    发明申请
    Perpendicular Magnetic Recording Medium Using Soft Magnetic Layer Which Suppresses Noise Generation, And Perpendicular Magnetic Recording Apparatus Therewith 审中-公开
    垂直磁记录介质使用抑制噪声产生的软磁层和垂直磁记录设备

    公开(公告)号：US20070217067A1

    公开(公告)日：2007-09-20

    申请号：US10593966

    申请日：2005-03-24

    申请人： Futoshi Nakamura ,  Tsutomu Tanaka ,  Yuka Aoyagi ,  Kenji Shimizu ,  Hiroshi Sakai ,  Akira Sakawaki

    发明人： Futoshi Nakamura ,  Tsutomu Tanaka ,  Yuka Aoyagi ,  Kenji Shimizu ,  Hiroshi Sakai ,  Akira Sakawaki

    IPC分类号： G11B5/31

    CPC分类号： G11B5/66 ,  B82Y25/00 ,  G11B5/667 ,  H01F10/08 ,  H01F10/3222

    摘要： The magnetic recording medium of the present invention has a substrate, a perpendicular magnetic recording layer, and a soft magnetic layer formed therebetween, having a thickness of less than 100 nm, the soft magnetic layer having a magnetic anisotropy in a surface direction, and product Bs·Hc, which is a production of a saturation magnetic flux density Bs and a coercive force Hc, of not less than 79 T·A/m (10 kG·Oe). By making the thickness of the soft magnetic layer into the above-mentioned range, the magnetic anisotropy in surface direction can be stabilized. magnetostatic energy can be increased sufficiently by making the Bs·Hc the above-mentioned range. Therefore, generating of the magnetic wall in the soft magnetic layer can be suppressed, the noise generating from the soft magnetic layer can be suppressed, and a high-density recording is enabled.

    摘要翻译： 本发明的磁记录介质具有厚度小于100nm的基板，垂直磁记录层和形成在其间的软磁性层，软磁层在表面方向上具有磁各向异性，产品 Bs.Hc，其为饱和磁通密度Bs和矫顽力Hc的产生，不小于79 TA / m（10kG.Oe）。 通过使软磁性层的厚度达到上述范围，可以使表面方向的磁各向异性稳定。 通过使Bs.Hc达到上述范围，可以充分增加静磁能。 因此，可以抑制软磁层中的磁壁的产生，能够抑制从软磁性层产生的噪声，能够实现高密度记录。