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    Perpendicular magnetic recording medium
    1.
    发明授权
    Perpendicular magnetic recording medium 有权
    垂直磁记录介质

    公开(公告)号：US08323808B2

    公开(公告)日：2012-12-04

    申请号：US11032691

    申请日：2005-01-10

    Applicant: Osamu Kitakami ,  Yutaka Shimada ,  Satoshi Okamoto ,  Takehito Shimatsu ,  Hajime Aoi ,  Hiroaki Muraoka ,  Yoshihisa Nakamura ,  Hiroyuki Uwazumi ,  Tadaaki Oikawa

    Inventor： Osamu Kitakami ,  Yutaka Shimada ,  Satoshi Okamoto ,  Takehito Shimatsu ,  Hajime Aoi ,  Hiroaki Muraoka ,  Yoshihisa Nakamura ,  Hiroyuki Uwazumi ,  Tadaaki Oikawa

    IPC: G11B5/66

    CPC classification number: G11B5/66 ,  G11B5/65 ,  G11B5/656

    Abstract: There is provided a perpendicular magnetic recording medium according to which both the thermal stability of the magnetization is good and writing with a magnetic head is easy, and moreover the SNR is improved. In the case of a perpendicular magnetic recording medium comprising a nonmagnetic substrate 1, and at least a nonmagnetic underlayer 2, a magnetic recording layer 3 and a protective layer 4 formed in this order on the nonmagnetic substrate 1, the magnetic recording layer 3 comprises a low Ku region 31 layer having a perpendicular magnetic anisotropy constant (Ku value) of not more than 1×105 erg/cm3, and a high Ku region 32 layer having a Ku value of at least 1×106 erg/cm3. Moreover, the magnetic recording layer 3 is made to have therein nonmagnetic grain boundaries that contain a nonmagnetic oxide and magnetically isolate crystal grains, which are made of a ferromagnetic metal, from one another.

    Abstract translation: 提供了一种垂直磁记录介质，根据该磁记录介质，磁化的热稳定性都很好，并且用磁头进行写入容易，此外SNR提高。 在包括非磁性基板1和至少一个非磁性底层2，在非磁性基板1上依次形成的磁记录层3和保护层4的垂直磁记录介质的情况下，磁记录层3包括 具有不大于1×105erg / cm3的垂直磁各向异性常数（Ku值）的低Ku区31层和Ku值至少为1×106erg / cm3的高Ku区32层。 此外，使磁记录层3具有包含非磁性氧化物的非磁性晶界，并且将由铁磁性金属制成的晶粒彼此磁分离。

    Method for error correction and circuit for realizing same
    6.
    发明授权
    Method for error correction and circuit for realizing same 失效
    误差校正方法及其实现方法

    公开(公告)号：US5325364A

    公开(公告)日：1994-06-28

    申请号：US412514

    申请日：1989-09-26

    Applicant: Yasuhide Ouchi ,  Hajime Aoi ,  Yoshihisa Kamo ,  Yosuke Seo ,  Hitoshi Kakuta

    Inventor： Yasuhide Ouchi ,  Hajime Aoi ,  Yoshihisa Kamo ,  Yosuke Seo ,  Hitoshi Kakuta

    IPC: G06F11/10 ,  G06F11/14 ,  H03M13/00 ,  G06F11/00

    CPC classification number: G06F11/1076 ,  G06F11/1008 ,  G06F11/1443

    Abstract: An error correction circuit which includes a specification circuit for specifying erroneous portions in a first data set reproduced from a recording medium, a register for storing the reproduced first data set including the erroneous portions thus specified and a reproducing circuit responsive to the reproduced first data set for reproducing again the first data set from the recording medium to obtain retry data, when there exist erroneous portions in the reproduced first data set stored in the register. The correction circuit also includes a data replace circuit, connected to receive the retry data, for replacing information at the specified erroneous portions in the reproduced first data set stored in the register by information at corresponding portions in the retry data.

    Abstract translation: 一种误差校正电路，包括用于指定从记录介质再现的第一数据组中的错误部分的指定电路，用于存储包括如此指定的错误部分的再现的第一数据组的寄存器和响应于再现的第一数据集的再现电路 当存储在寄存器中的再现的第一数据组中存在错误部分时，再次从记录介质再现第一数据组以获得重试数据。 校正电路还包括连接以接收重试数据的数据替换电路，用于通过重试数据中的相应部分处的信息替换存储在寄存器中的再现的第一数据集中的指定错误部分处的信息。

    High speed seek sector servo magnetic disk drive unit
    7.
    发明授权
    High speed seek sector servo magnetic disk drive unit 失效
    高速搜索扇区伺服磁盘驱动单元

    公开(公告)号：US5132854A

    公开(公告)日：1992-07-21

    申请号：US408197

    申请日：1989-09-15

    Applicant: Toshiaki Tsuyoshi ,  Yosuke Seo ,  Hajime Aoi

    Inventor： Toshiaki Tsuyoshi ,  Yosuke Seo ,  Hajime Aoi

    IPC: G11B21/08 ,  G11B5/55

    CPC classification number: G11B5/5547 ,  G11B5/5565

    Abstract: A disk drive unit is disclosed, which comprises a recording medium having more than two disk-shaped recording faces disposed on each other with an interval; information tracks disposed along the periphery on the more than two recording faces and servo signal fields on the recording faces, in the peripheral direction for different recording faces; more than two heads reading out servo information from the servo signal fields on the more than two recording faces; head moving means for moving the heads in the radial direction of the recording faces, linked with each other; means for obtaining position signals on the recording faces at different points of time for different heads on the basis of the servo signals; means for obtaining information on the relative velocity of the heads to the recording faces from the position signals at different points of time for different recording faces, and control means for effecting the velocity control by means of the head moving means on the basis of the information on the relative velocity.

    Abstract translation: 公开了一种磁盘驱动单元，其包括具有多于两个盘形记录面的记录介质，所述记录介质以间隔彼此配置; 信息轨道沿着周边设置在记录面上的两个以上记录面和伺服信号场，沿着不同记录面的周边方向; 两个以上的磁头从两个以上的记录面的伺服信号场读出伺服信息; 头部移动装置，用于使记录面的径向移动头部; 用于根据所述伺服信号在不同的时刻针对记录面获取位置信号的装置; 用于从针对不同记录面的不同时间点的位置信号获得关于头到记录面的相对速度的信息的装置，以及用于通过头部移动装置基于信息进行速度控制的控制装置 相对速度。

    Read channel for magnetic recording
    9.
    发明授权
    Read channel for magnetic recording 失效
    读取磁记录通道

    公开(公告)号：US4774601A

    公开(公告)日：1988-09-27

    申请号：US940494

    申请日：1986-12-10

    Applicant: Yasuhide Ouchi ,  Hajime Aoi ,  Takashi Tamura ,  Nobumasa Nishiyama

    Inventor： Yasuhide Ouchi ,  Hajime Aoi ,  Takashi Tamura ,  Nobumasa Nishiyama

    IPC: G11B5/09 ,  G11B20/10

    CPC classification number: G11B20/10009 ,  G11B20/10

    Abstract: In a read channel for magnetic recording used to reproduce information recorded on a magnetic recording medium, a signal reproduced from a magnetic head and a differentiated signal of the reproduction signal are ORed together to produce a gate signal. By using the gate signal, the information can be reproduced correctly.

    Abstract translation: 在用于再现记录在磁记录介质上的信息的用于磁记录的读取通道中，从磁头再现的信号和再现信号的微分信号被或者并联在一起以产生一个门信号。 通过使用门信号，可以正确地再现信息。

    MAGNETIC RECORDING MEDIUM
    10.
    发明申请
    MAGNETIC RECORDING MEDIUM 审中-公开
    磁记录介质

    公开(公告)号：US20110020669A1

    公开(公告)日：2011-01-27

    申请号：US12840374

    申请日：2010-07-21

    Applicant: Junichi SAYAMA ,  Hiroaki Nemoto ,  Hiroshi Ide ,  Hiroyasu Kataoka ,  Nobuyukl Takahashi ,  Takehito Shimatsu ,  Osamu Kitakami ,  Satoshi Okamoto ,  Hajime Aoi

    Inventor： Junichi SAYAMA ,  Hiroaki Nemoto ,  Hiroshi Ide ,  Hiroyasu Kataoka ,  Nobuyukl Takahashi ,  Takehito Shimatsu ,  Osamu Kitakami ,  Satoshi Okamoto ,  Hajime Aoi

    IPC: G11B5/706 ,  G11B5/62 ,  G11B5/73

    CPC classification number: G11B5/656 ,  G11B5/65 ,  G11B5/7315 ,  G11B5/7325

    Abstract: A magnetic recording medium having excellent stability of recorded magnetic signals and capable of recording magnetic signals by a thermally assisted magnetic recording system in which a magnetic recording layer of the magnetic recording medium contains ferromagnetic crystal grains of a Co—Ni—Pt alloy with a Pt content of 44 at % or more and 55 at % or less and with an atom content ratio: Ni/(Co+Ni) of 0.64 or more and 0.8 or less. The magnetic recording medium has extremely excellent stability of recorded magnetic signals since the Co—Ni—Pt alloy constituting the magnetic recording layer has an extremely high anisotropy field at a normal temperature. Further, the magnetic recording medium can perform signal recording based on the thermally assisted magnetic recording system since the Co—Ni—Pt alloy constituting the magnetic recording layer has a Curie point within an appropriate temperature range.

    Abstract translation: 一种磁记录介质，其具有良好的记录磁信号的稳定性并且能够通过热辅助磁记录系统记录磁信号，其中磁记录介质的磁记录层包含Co-Ni-Pt合金的铁磁晶粒与Pt 含量为44原子％以上且55原子％以下，原子含量比：Ni /（Co + Ni）为0.64以上且0.8以下。 由于构成磁记录层的Co-Ni-Pt合金在常温下具有极高的各向异性场，所以磁记录介质具有非常优异的记录磁信号的稳定性。 此外，由于构成磁记录层的Co-Ni-Pt合金在适当的温度范围内具有居里点，所以磁记录介质可以基于热辅助磁记录系统执行信号记录。

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