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    Method for recording information data to a recording medium by irradiation with a light beam and application of a magnetic field
    23.
    发明授权
    Method for recording information data to a recording medium by irradiation with a light beam and application of a magnetic field 失效
    通过用光束照射和施加磁场将信息数据记录到记录介质的方法

    公开(公告)号：US07352658B2

    公开(公告)日：2008-04-01

    申请号：US10381315

    申请日：2001-02-07

    申请人： Katsusuke Shimazaki ,  Norio Ohta ,  Fumiyoshi Kirino

    发明人： Katsusuke Shimazaki ,  Norio Ohta ,  Fumiyoshi Kirino

    IPC分类号： G11B11/00

    CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/3909 ,  G11B5/3954 ,  G11B5/4886 ,  G11B5/66 ,  G11B5/74 ,  G11B5/82 ,  G11B5/86 ,  G11B11/10504 ,  G11B11/10554 ,  G11B11/1058 ,  G11B11/10584 ,  G11B11/10591 ,  G11B2005/0005 ,  G11B2005/001 ,  G11B2005/0021 ,  G11B2005/3996

    摘要： A magnetic recording medium comprises a first magnetic film and a second magnetic film on a substrate. The second magnetic film is composed of a magnetic material preferred for recording and reproduction, and the first magnetic film is composed of a ferrimagnetic material excellent in thermal stability. Information is recorded in the second magnetic film by using a magnetic head. The first magnetic film is heated by being irradiated with a laser beam to lower coercivity, and the information in the second magnetic film is magnetically transferred to the first magnetic film. The recorded information is stabilized, because the first magnetic film is excellent in thermal stability. The magnetic recording medium is highly resistant to thermal fluctuation, and it has high reliability. A magnetic domain of about 0.1 μm, formed by magnetic recording at a super high density of 50 Gb/inch2, is successfully and stably allowed to exist.

    摘要翻译： 磁记录介质包括在基板上的第一磁性膜和第二磁性膜。 第二磁性膜由优选用于记录和再现的磁性材料组成，第一磁性膜由热稳定性优异的亚铁磁性材料构成。 通过使用磁头将信息记录在第二磁性膜中。 通过用激光束照射第一磁性膜以降低矫顽力，并且将第二磁性膜中的信息磁性转移到第一磁性膜。 记录信息稳定，因为第一磁性膜的热稳定性优异。 磁记录介质对热波动具有很高的抵抗力，可靠性高。 通过以50Gb /英寸2的超高密度的磁记录形成的大约0.1μm的磁畴被成功且稳定地存在。

    Method for recording and reproduction on a magneto-optical recording medium
    24.
    发明授权
    Method for recording and reproduction on a magneto-optical recording medium 失效
    在磁光记录介质上进行记录和再现的方法

    公开(公告)号：US07113453B1

    公开(公告)日：2006-09-26

    申请号：US09321795

    申请日：1999-05-28

    申请人： Katsusuke Shimazaki ,  Norio Ohta ,  Akiyoshi Ito ,  Katsuji Nakagawa ,  Kazuko Inoue

    发明人： Katsusuke Shimazaki ,  Norio Ohta ,  Akiyoshi Ito ,  Katsuji Nakagawa ,  Kazuko Inoue

    IPC分类号： G11B11/00 ,  G11B7/24

    CPC分类号： G11B11/10508 ,  G11B11/10515 ,  G11B11/10586

    摘要： A magneto-optical recording medium and a method for recording and reproduction thereon are provided in order to reproduce information recorded by multi-valued recording at a high S/N ratio. Disclosed is a magneto-optical recording medium including two magnetic layers capable of four-valued recording based on four combined magnetization states. Magnitudes of reproduction signals concerning the four magnetization states, obtained upon reproduction at a wavelength λ1, are different from those obtained upon reproduction at a wavelength λ2. The two magnetic layers, on which a signal (a) is recorded, are irradiated with light beams having the wavelengths λ1 and λ2 respectively. Signals (d), (e) reproduced from respective reflected light beams are sliced by using at least one slice level to obtain two-valued or higher multi-valued reproduction signals respectively. The two-valued or higher multi-valued reproduction signals (f), (g) from the respective wavelengths are mutually subjected to logical operation to reproduce recorded information (i).

    摘要翻译： 提供磁光记录介质及其上的记录和再现方法，以便以高S / N比再现通过多值记录记录的信息。 公开了一种包括基于四个组合磁化状态能够进行四值记录的两个磁性层的磁光记录介质。 在波长λ1 1再现时获得的关于四个磁化状态的再现信号的幅度与在波长λ2 2再现时获得的重现信号的大小不同。 在其上记录有信号（a）的两个磁性层分别用波长λ1和λ2的光束照射。 通过使用至少一个限幅电平对从各反射光束再现的信号（d），（e）进行分片，以分别获得二值或更高的多值再现信号。 来自各个波长的两值或更高的多值再生信号（f），（g））相互进行逻辑运算以再现记录信息（i）。

    Magneto-optical recording medium and method for recording and reproduction thereon
    25.
    发明授权
    Magneto-optical recording medium and method for recording and reproduction thereon 失效
    磁光记录介质及其上的记录和再现方法

    公开(公告)号：US5923625A

    公开(公告)日：1999-07-13

    申请号：US981308

    申请日：1997-12-16

    申请人： Katsusuke Shimazaki ,  Norio Ohta ,  Akiyoshi Ito ,  Katsuji Nakagawa ,  Kazuko Inoue

    发明人： Katsusuke Shimazaki ,  Norio Ohta ,  Akiyoshi Ito ,  Katsuji Nakagawa ,  Kazuko Inoue

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

    CPC分类号： G11B11/10508 ,  G11B11/10515 ,  G11B11/10586

    摘要： A magneto-optical recording medium and a method for recording and reproduction thereon are provided in order to reproduce information recorded by multi-valued recording at a high S/N ratio. Disclosed is a magneto-optical recording medium including two magnetic layers capable of four-valued recording based on four combined magnetization states. Magnitudes of reproduction signals concerning the four magnetization states, obtained upon reproduction at a wavelength .lambda..sub.1, are different from those obtained upon reproduction at a wavelength .lambda..sub.2. The two magnetic layers, on which a signal (a) is recorded, are irradiated with light beams having the wavelengths .lambda..sub.1 and .lambda..sub.2 respectively. Signals (d), (e) reproduced from respective reflected light beams are sliced by using at least one slice level to obtain two-valued or higher multi-valued reproduction signals respectively. The two-valued or higher multi-valued reproduction signals (f), (g) from the respective wavelengths are mutually subjected to logical operation to reproduce recorded information (i).

    摘要翻译： PCT No.PCT / JP96 / 01938 Sec。 371日期：1997年12月16日 102（e）日期1997年12月16日PCT提交1996年7月12日PCT公布。 公开号WO97 / 03439 日期1997年1月30日提供磁光记录介质及其上的记录和再现方法，以便以高S / N比再现由多值记录记录的信息。 公开了一种包括基于四个组合磁化状态能够进行四值记录的两个磁性层的磁光记录介质。 关于在波长λ1再现时获得的四种磁化状态的再现信号的幅度与在波长λ2再现时获得的不同。将记录有信号（a）的两个磁性层照射 分别具有波长λ1和λ2的光束。 通过使用至少一个限幅电平对从各反射光束再现的信号（d），（e）进行分片，以分别获得二值或更高的多值再现信号。 来自各个波长的两值或更高的多值再生信号（f），（g））相互进行逻辑运算以再现记录信息（i）。

    Magneto-optical disk apparatus having an adjustment mechanism for setting the position of magnetic heads
    28.
    发明授权
    Magneto-optical disk apparatus having an adjustment mechanism for setting the position of magnetic heads 失效
    具有用于设定磁头位置的调整机构的磁光盘装置

    公开(公告)号：US06404705B1

    公开(公告)日：2002-06-11

    申请号：US09042020

    申请日：1998-03-13

    申请人： Hitoshi Watanabe ,  Norio Ohta ,  Masashi Suenaga

    发明人： Hitoshi Watanabe ,  Norio Ohta ,  Masashi Suenaga

    IPC分类号： G11B1100

    CPC分类号： G11B11/10573 ,  G11B11/10541 ,  G11B11/10595

    摘要： A magneto-optical disk apparatus and an adjustment method of a head mechanism are provided for strictly and quickly adjusting a setting position of a magnetic head with respect to an optical axis of an optical head. The adjustment method is executed by the following steps. A magnetic super resolution type magneto-optical disk is mounted to the magneto-optical disk apparatus provided with the optical head and the magnetic head. Then, an external magnetic field from the magnetic head is applied onto the magneto-optical disk as applying a laser beam of a reproduction level onto the magneto-optical disk. Then, a reproduction signal output read from the magneto-optical disk is detected concurrently with the application of the external magnetic field. Next, a fine adjustment mechanism is operated so that the reproduction signal output is made maximum with respect to the direction of the external magnetic field, for the purpose of sequentially changing a setting position of the magnetic head with respect of the optical axis of the optical head.

    摘要翻译： 提供一种磁光盘装置和头机构的调整方法，用于严格且快速地调整磁头相对于光学头的光轴的设定位置。 调整方法通过以下步骤执行。 磁性超分辨率型磁光盘被安装到设置有光头和磁头的磁光盘装置上。 然后，将磁头上的外部磁场施加到磁光盘上，将再现电平的激光束施加到磁光盘上。 然后，与外部磁场的施加同时检测从磁光盘读出的再现信号。 接下来，为了顺序地改变磁头相对于光学的光轴的设置位置的目的，操作微调机构使得再现信号输出相对于外部磁场的方向成为最大值 头。

    Information recording medium with clock information therein
    29.
    发明授权
    Information recording medium with clock information therein 失效
    具有时钟信息的信息记录介质

    公开(公告)号：US5959943A

    公开(公告)日：1999-09-28

    申请号：US932056

    申请日：1997-09-17

    申请人： Seiji Yonezawa ,  Norio Ohta ,  Toshio Niihara ,  Keiji Kataoka ,  Masahiko Takahashi ,  Harukazu Miyamoto ,  Hirofumi Sukeda ,  Toshiaki Tsuyoshi

    发明人： Seiji Yonezawa ,  Norio Ohta ,  Toshio Niihara ,  Keiji Kataoka ,  Masahiko Takahashi ,  Harukazu Miyamoto ,  Hirofumi Sukeda ,  Toshiaki Tsuyoshi

    IPC分类号： G11B20/10 ,  G11B5/02 ,  G11B7/006 ,  G11B7/007 ,  G11B11/10 ,  G11B11/105 ,  G11B27/19 ,  G11B27/30 ,  G11B11/00

    CPC分类号： G11B7/00745 ,  G11B11/10513 ,  G11B11/10521 ,  G11B11/10528 ,  G11B11/1053 ,  G11B11/10595 ,  G11B27/19 ,  G11B27/3027 ,  G11B7/006

    摘要： A magneto-optical data recording system comprises magnetic field pulse applying means for applying to a magneto-optic recording medium a magnetic field pulse of a polarity corresponding to code data to be recorded, and means for heating the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to be recorded. During recording, the magnetic field pulse applying means applies a magnetic field pulse of a polarity corresponding to code data along a track of the recording medium and the heating means continuously heats the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to thereby directly overwrite the code data. The magnetic field pulse applying means includes a magnetic coil driven by code data from a source of code data (data generator). The heating means includes an optical head which comprises a source of laser beam driven by a laser driver and an optical system which focuses the laser beam from the source of laser beam as a small light spot onto the recording medium.

    摘要翻译： 一种磁光数据记录系统，包括磁场脉冲施加装置，用于向磁光记录介质施加与要记录的代码数据相对应的极性的磁场脉冲，以及用于以脉动方式加热记录介质的装置， 与要记录的代码数据同步的预定频率。 在记录期间，磁场脉冲施加装置沿着记录介质的轨道施加与代码数据对应的极性的磁场脉冲，并且加热装置以与代码数据同步的预定频率的脉动方式连续地加热记录介质 从而直接覆盖代码数据。 磁场脉冲施加装置包括由代码数据源（数据发生器）的代码数据驱动的磁线圈。 加热装置包括光学头，其包括由激光驱动器驱动的激光束源和将来自激光源的激光束作为小光点聚焦到记录介质上的光学系统。

    Method for detecting the coordinate position of the grinding point of a grinding wheel and related device
    30.
    发明授权
    Method for detecting the coordinate position of the grinding point of a grinding wheel and related device 失效
    检测研磨轮和相关装置的研磨点坐标位置的方法

    公开(公告)号：US5224050A

    公开(公告)日：1993-06-29

    申请号：US554419

    申请日：1990-07-19

    申请人： Norio Ohta ,  Yoshio Wakazono

    发明人： Norio Ohta ,  Yoshio Wakazono

    IPC分类号： B24B47/22 ,  B23Q17/22 ,  G05B19/401

    CPC分类号： G05B19/4015

    摘要： A method for detecting the coordinate position of the grinding point of a grinding wheel supported on a swiveling table comprises the steps of: rotating drivably the swiveling table through a specified angle from a start position so as to arrive at a first turning position; measuring a first displacement of the grinding point of the grinding wheel from the start position by displacement measuring means; rotating the swiveling table through the specified angle from the first turning position so as to arrive at a second turning position; measuring a second displacement of the grinding point of the griding wheel from the first turning position by the displacement measuring means; and calculating the position of the grinding wheel with respect to the swivel axis of swiveling table according to the first and the second displacement and the specified angle.