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64 条记录 (耗时 0.014 秒)

    Method for driving magnetic head and driving circuit of magneto-optical disk drive
    31.
    发明申请
    Method for driving magnetic head and driving circuit of magneto-optical disk drive 失效
    磁光盘驱动磁头驱动电路的方法

    公开(公告)号：US20030007427A1

    公开(公告)日：2003-01-09

    申请号：US10185851

    申请日：2002-06-27

    申请人： FUJITSU LIMITED

    发明人： Michio Matsuura

    IPC分类号： G11B011/00

    CPC分类号： G11B11/1051 ,  G11B11/10508 ,  H03K17/12 ,  H03K17/64 ,  H03K17/84 ,  H03K2217/0036

    摘要： A driving circuit for a magnetic head that is used for modulating magnetic field in a magneto-optical disk drive is provided, which reduces power consumption even if the magnetic head has large inductance. The driving circuit comprises a switching circuit for generating pulse-like drive current in synchronization with a timing for applying a pulse of light in accordance with a space between pits to be recorded on a magneto-optical disk, and a conversion circuit for converting the pulse-like drive current into sine-wave current to be supplied to the magnetic head such that the maximum magnetic field can be obtained at the timing for applying a pulse of light.

    摘要翻译： 提供了用于调制磁光盘驱动器中的磁场的用于磁头的驱动电路，即使磁头具有较大的电感也能降低功耗。 该驱动电路包括与根据要记录在磁光盘上的凹坑之间的空间施加光脉冲的定时同步地产生脉冲状驱动电流的开关电路和用于转换脉冲的转换电路 类似的驱动电流进入正弦波电流以提供给磁头，使得可以在施加光脉冲的定时获得最大磁场。

    Magneto-optically recorded data readout system
    34.
    发明授权
    Magneto-optically recorded data readout system 失效
    磁光记录数据读出系统

    公开(公告)号：US6122229A

    公开(公告)日：2000-09-19

    申请号：US185392

    申请日：1998-11-03

    申请人： Seiji Yonezawa

    发明人： Seiji Yonezawa

    IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B11/00

    CPC分类号： G11B11/10515 ,  G11B11/1051 ,  G11B11/10578 ,  G11B11/10595

    摘要： A magneto-optically recorded data readout system for the readout of a data pit recorded on a magneto-optical recording medium comprising a memory layer, a switching layer and a displacement layer, said system comprising a means for magnetic domain expansion of said data pit for readout. By which means the recording medium is irradiated and heated with a pulsed laser beam of light such that a domain wall of said data pit can be displaced in the displacement layer and wherein the frequency of the laser beam of light is higher than the highest frequency of the data pit.

    摘要翻译： 一种用于读出记录在包括存储层，开关层和位移层的磁光记录介质上的数据凹坑的磁光记录数据读出系统，所述系统包括用于所述数据凹坑的磁畴扩展的装置，用于 读出。 通过这种方式，记录介质用脉冲激光束照射和加热，使得所述数据凹坑的畴壁可以在位移层中移位，并且其中激光束的频率高于 数据坑。

    Magneto-optical recording medium and manufacturing method thereof
    35.
    发明授权
    Magneto-optical recording medium and manufacturing method thereof 失效
    磁光记录介质及其制造方法

    公开(公告)号：US5968678A

    公开(公告)日：1999-10-19

    申请号：US689149

    申请日：1996-07-30

    申请人： Kenji Tanase ,  Atsushi Yamaguchi ,  Yoshihisa Suzuki ,  Satoshi Sumi ,  Yoshiharu Uchihara ,  Seiji Murata ,  Kenji Torasawa

    发明人： Kenji Tanase ,  Atsushi Yamaguchi ,  Yoshihisa Suzuki ,  Satoshi Sumi ,  Yoshiharu Uchihara ,  Seiji Murata ,  Kenji Torasawa

    IPC分类号： G11B11/105 ,  G11B5/66

    CPC分类号： G11B11/1051 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10586 ,  G11B11/10595 ,  Y10S428/90

    摘要： In magneto-optical recording medium, on a transparent substrate of polycarbonate resin, an SiN film having the thickness of 600 to 800 .ANG. and surface roughness Rmax of at most 10 nm is formed. On the SiN film, a GdFeCo reading layer having the thickness of 800 to 1200 .ANG. with Gd content of 30 to 36 at. % and Co content of 12 to 50 at. % is formed. On the reading layer, a TbFeCo recording layer of which Co content is 10 to 16 at. % is formed. The recording layer is a perpendicular magnetization film, and the reading layer is an in-plane magnetization film. At the time of reading, the reading and recording layers are heated, and the direction of magnetization of the recording layer is transferred to the reading layer only in the prescribed heated area. Information can be read only from the transferred portion, and thus a super resolution effect is obtained. When Kerr rotation angle .theta..sub.K is measured for the light reflected from the reading layer while the temperatures of the reading and recording layers are elevated, .theta..sub.K is approximately in proportion to Cth power of the elevated temperature t, wherein C is at least 8.0.

    摘要翻译： 在磁光记录介质中，在聚碳酸酯树脂的透明基板上形成厚度为600〜800的SiN膜，表面粗糙度Rmax为10nm以下。 在SiN膜上，具有800〜1200厚度的GdFeCo读取层，Gd含量为30〜36at。 ％，Co含量为12〜50。 ％ 形成了。 在读取层上，Co含量为10〜16at的TbFeCo记录层。 ％ 形成了。 记录层是垂直磁化膜，读取层是面内磁化膜。 在读取时，读取和记录层被加热，并且仅在规定的加热区域中记录层的磁化方向被转移到读取层。 信息只能从传送部分读取，从而获得超分辨率效果。 当读取层和记录层的温度升高时，对于从读取层反射的光测量克尔旋转角θK时，θK与升高温度t的Cth功率大致成比例，其中C至少为8.0。

    Magneto-optic disk apparatus
    36.
    发明授权
    Magneto-optic disk apparatus 失效
    磁光盘装置

    公开(公告)号：US5363352A

    公开(公告)日：1994-11-08

    申请号：US14112

    申请日：1993-02-05

    申请人： Minoru Tobita ,  Tamotsu Yamagami

    发明人： Minoru Tobita ,  Tamotsu Yamagami

    IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B11/00

    CPC分类号： G11B20/10083 ,  G11B11/10515 ,  G11B11/10517 ,  G11B20/10009 ,  G11B20/1258 ,  G11B11/1051

    摘要： A magneto-optic disk apparatus is disclosed which can reproduce data well from a magneto-optic disk on which the data are reproduced in a high density with an increased line density. Recording data are converted into NRZI data by a pre-encoder and recorded onto a magneto-optic disk using a magnetic field modulating method while irradiating a laser beam intermittently upon the disk. A reproduced radio frequency signal from the disk is clamped for each segment by a clamp circuit, converted into a digital signal by an analog to digital converter, waveform equalized by an equalizer so that it may be approximated to the waveform of a cosine filter suitable for partial response PR(1, 1), and supplied to a data detection circuit. The data detection circuit detects data using the viterbi algorithm to obtain reproduced data in the form of NRZ data. Since the partial response PR(1, 1) in which inter symbol interference is used positively is applied, even if the line density is raised to achieve high density recording, a sufficient phase margin can be assured. Since viterbi decoding is applied, the S/N ratio is enhanced to reduce the code error rate.

    摘要翻译： 公开了一种磁光盘装置，其可以从其中数据以高密度再现的磁光盘良好地再现数据，并且线密度增加。 通过预编码器将记录数据转换成NRZI数据，并且使用磁场调制方法在光盘上间歇地照射激光束时将其记录在磁光盘上。 来自盘的再现的射频信号通过钳位电路针对每个段被钳位，由模数转换器转换为数字信号，由均衡器均衡的波形，使得其可以近似为适合于 部分响应PR（1,1），并被提供给数据检测电路。 数据检测电路使用维特比算法检测数据，以获得NRZ数据形式的再现数据。 由于使用其中使用符号间干扰的部分响应PR（1,1），即使线密度升高以实现高密度记录，也可以确保足够的相位裕度。 由于应用了维特比解码，因此增强了S / N比以降低码错误率。