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    Magneto-optical recording medium and method of reproducing information recorded on such medium
    3.
    发明授权
    Magneto-optical recording medium and method of reproducing information recorded on such medium 失效
    磁光记录介质和再现记录在这种介质上的信息的方法

    公开(公告)号：US6030716A

    公开(公告)日：2000-02-29

    申请号：US971970

    申请日：1997-11-17

    申请人： Haruhiko Izumi ,  Ken Tamanoi ,  Masaharu Moritsugu ,  Miyozo Maeda ,  Toshio Sugimoto ,  Koji Matsumoto ,  Motonobu Mihara

    发明人： Haruhiko Izumi ,  Ken Tamanoi ,  Masaharu Moritsugu ,  Miyozo Maeda ,  Toshio Sugimoto ,  Koji Matsumoto ,  Motonobu Mihara

    IPC分类号： G11B11/10 ,  G11B7/125 ,  G11B11/105 ,  G11B5/66

    CPC分类号： G11B7/126 ,  G11B11/10515 ,  G11B11/10584 ,  G11B11/10586 ,  G11B11/10595 ,  G11B11/10597 ,  Y10S428/90

    摘要： A magneto-optical recording medium adapted for reproduction of a high resolution signal without the necessity of a reproducing magnetic field. The magneto-optical recording medium comprises a transparent substrate and deposits of a reproducing layer, a switch layer and a recording layer formed on the transparent substrate successively. The reproducing layer is a perpendicular magnetization film at a room temperature but is turned to an in-plane magnetization film when heated beyond a predetermined temperature. Each of the switch layer and the recording layer is a perpendicular magnetization film. The respective Curie temperatures Tc1, Tc2 and Tc3 of the reproducing layer, the switch layer and the recording layer satisfy the relationship of Tc1>Tc3>Tc2. When a reproducing laser beam is irradiated to the recording medium, the switched connection between the reproducing layer and the recording layer is interrupted in a high temperature region heated beyond the Curie temperature of the switch layer, whereby the reproducing layer is caused to present in-plane magnetization.

    摘要翻译： 一种适于再现高分辨率信号而不需要再现磁场的磁光记录介质。 磁光记录介质依次包括透明基板和再现层，开关层和形成在透明基板上的记录层的沉积物。 再现层是在室温下的垂直磁化膜，但是当被加热超过预定温度时转变为面内磁化膜。 开关层和记录层中的每一个都是垂直磁化膜。 再现层，开关层和记录层的各居里温度Tc1，Tc2，Tc3满足Tc1> Tc3> Tc2的关系。 当再现激光束被照射到记录介质上时，再现层和记录层之间的切换连接在加热超过开关层居里温度的高温区域中断， 平面磁化。

    Data readout system for optical disk having maximum likehood data detecting circuit
    7.
    发明授权
    Data readout system for optical disk having maximum likehood data detecting circuit 失效
    具有最大像素数据检测电路的光盘数据读出系统

    公开(公告)号：US5850377A

    公开(公告)日：1998-12-15

    申请号：US838832

    申请日：1997-04-11

    申请人： Masakazu Taguchi ,  Haruhiko Izumi

    发明人： Masakazu Taguchi ,  Haruhiko Izumi

    IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12

    CPC分类号： G11B20/10083 ,  G11B11/10515 ,  G11B20/10009 ,  G11B7/005 ,  G11B20/1258 ,  G11B2220/2537

    摘要： A system reproduces data from an optical disk in which a signal obtained by encoding recording data in accordance with a recording rule including a rule corresponding to a partial response class I characteristic has been recorded. The system includes an optical head for reproducing a signal from the optical disk, an analog-to-digital converter for sampling the signal reproduced by the optical head at predetermined timing and for outputting sampling data, a determination unit for determining, based on the sampling data from the analog-to-digital converter, a transition state of data to be reproduced in accordance with a transmission line characteristic of the reproduction system for the optical disk, and a data decision unit for deciding maximum likelihood reproduction data at present timing based on the determination result obtained by the determination unit.

    摘要翻译： 系统从光盘再现数据，其中根据包括与部分响应等级I特性对应的规则的记录规则对记录数据进行编码而获得的信号被记录在其中。 该系统包括用于再现来自光盘的信号的光学头，用于在预定定时对由光头再现的信号进行采样并用于输出采样数据的模数转换器，确定单元，用于基于采样 来自模数转换器的数据，根据用于光盘的再现系统的传输线特性要再现的数据的转变状态，以及数据判定单元，用于基于当前定时决定最大似然再现数据 由确定单元获得的确定结果。

    PRML readout system for optical disk
    8.
    发明授权
    PRML readout system for optical disk 失效
    PRML读取光盘系统

    公开(公告)号：US5986987A

    公开(公告)日：1999-11-16

    申请号：US54653

    申请日：1998-04-03

    申请人： Masakazu Taguchi ,  Haruhiko Izumi

    发明人： Masakazu Taguchi ,  Haruhiko Izumi

    IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12

    CPC分类号： G11B20/10083 ,  G11B11/10515 ,  G11B20/10009 ,  G11B7/005 ,  G11B20/1258 ,  G11B2220/2537

    摘要： A system reproduces data from an optical disk in which a signal obtained by encoding recording data in accordance with a recording rule including a rule corresponding to a partial response class I characteristic has been recorded. The system includes an optical head for reproducing a signal from the optical disk, an analog-to-digital converter for sampling the signal reproduced by the optical head at predetermined timing and for outputting sampling data, a determination unit for determining, based on the sampling data from the analog-to-digital converter, a transition state of data to be reproduced in accordance with a transmission line characteristic of the reproduction system for the optical disk, and a data decision unit for deciding maximum likelihood reproduction data at present timing based on the determination result obtained by the determination unit.

    摘要翻译： 系统从光盘再现数据，其中根据包括与部分响应等级I特性对应的规则的记录规则对记录数据进行编码而获得的信号被记录在其中。 该系统包括用于再现来自光盘的信号的光学头，用于在预定定时对由光头再现的信号进行采样并用于输出采样数据的模数转换器，确定单元，用于基于采样 来自模数转换器的数据，根据用于光盘的再现系统的传输线特性要再现的数据的转变状态，以及数据判定单元，用于基于当前定时决定最大似然再现数据 由确定单元获得的确定结果。

    Edge position data reproduction apparatus
    9.
    发明授权
    Edge position data reproduction apparatus 失效
    边缘位置数据再现装置

    公开(公告)号：US5745464A

    公开(公告)日：1998-04-28

    申请号：US826286

    申请日：1997-03-27

    申请人： Masakazu Taguchi ,  Haruhiko Izumi

    发明人： Masakazu Taguchi ,  Haruhiko Izumi

    IPC分类号： G11B20/14 ,  G11B7/00 ,  G11B7/005 ,  G11B11/105 ,  G11B20/10 ,  G11B20/18

    CPC分类号： G11B20/10009 ,  G11B11/10515 ,  G11B7/005

    摘要： A data reproduction apparatus for reproducing data corresponding to front and rear edges of marks is recorded in an optical disk. The apparatus includes an optical head for obtaining a reproduction waveform from the optical disk, an A/D converter for obtaining a real sampling value from the reproduction waveform so as to detect an ascending edge (or a descending edge), an interpolator for obtaining a descending edge (or ascending edge) calculate sampling value through interpolation using the real sampling value, and a maximum likelihood detector for detecting a maximum likelihood signal on the basis of a real sampling value and the interpolated sampling value.

    摘要翻译： 用于再现与标记的前边缘和后边缘对应的数据的数据再现装置被记录在光盘中。 该装置包括用于从光盘获得再现波形的光学头，用于从再现波形获得实际采样值以检测上升沿（或下降沿）的A / D转换器，用于获得 下降沿（或上升沿）通过使用实际采样值的内插计算采样值，以及最大似然检测器，用于基于实际采样值和内插采样值来检测最大似然信号。

    Magneto-optic disk recording system having improved duty ratio controller
    10.
    发明授权
    Magneto-optic disk recording system having improved duty ratio controller 失效
    具有改进的占空比控制器的磁光盘记录系统

    公开(公告)号：US5854775A

    公开(公告)日：1998-12-29

    申请号：US740260

    申请日：1996-10-25

    申请人： Haruhiko Izumi ,  Masaharu Moritsugu ,  Masakazu Taguchi

    发明人： Haruhiko Izumi ,  Masaharu Moritsugu ,  Masakazu Taguchi

    IPC分类号： G11B11/105 ,  G11B11/00

    CPC分类号： G11B11/1053 ,  G11B11/10506 ,  G11B11/10521

    摘要： A magneto-optic disk recording system capable of canceling shifts of the front edge and the rear edge of the record mark due to accumulation of heat. The recording system includes a magneto-optic disk having a record magnetic film, and a magnet for applying a bias magnetic field to the disk in the direction perpendicular thereto. The recording system further includes a laser diode for generating laser beams, an optical head for focusing the laser beam on the disk, a pulse generator for generating square wave pulses with a predetermined period, and a duty ratio controller for alternately increasing and decreasing the duty ratio of the square wave pulses every time data "1" of binary record data is generated. The laser diode is driven by a constant-current circuit for write power. There is connected a switch between the laser diode and the constant-current circuit for write power. The switch is turned on/off in accordance with the output pulse of the duty ratio controller so that the laser diode emits a pulsed beam.

    摘要翻译： 一种磁光盘记录系统，其能够消除由于积聚而导致的记录标记的前边缘和后边缘的偏移。 记录系统包括具有记录磁性膜的磁光盘和用于在与其垂直的方向上向磁盘施加偏置磁场的磁体。 记录系统还包括用于产生激光束的激光二极管，用于将激光束聚焦在盘上的光头，用于产生具有预定周期的方波脉冲的脉冲发生器和用于交替地增加和减小占空比的占空比控制器 每当产生二进制记录数据的数据“1”时，方波脉冲的比率。 激光二极管由用于写入功率的恒流电路驱动。 在激光二极管和恒流电路之间连接一个开关，用于写入功率。 根据占空比控制器的输出脉冲使开关导通/截止，使得激光二极管发射脉冲光束。