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    Apparatus and method for recording/reproducing magneto-optical information
    21.
    发明授权
    Apparatus and method for recording/reproducing magneto-optical information 失效
    用于记录/再现磁光信息的装置和方法

    公开(公告)号：US06169714A

    公开(公告)日：2001-01-02

    申请号：US09173069

    申请日：1998-10-16

    Applicant: Yasuhito Tanaka ,  Masaaki Kurebayashi ,  Takeshi Maeda ,  Hitoshi Watanabe ,  Tetsu Watanabe ,  Shigemi Maeda ,  Satoshi Sumi ,  Nobuhide Matsubayashi ,  Michio Matsuura

    Inventor： Yasuhito Tanaka ,  Masaaki Kurebayashi ,  Takeshi Maeda ,  Hitoshi Watanabe ,  Tetsu Watanabe ,  Shigemi Maeda ,  Satoshi Sumi ,  Nobuhide Matsubayashi ,  Michio Matsuura

    IPC: G11B709

    CPC classification number: G11B7/126 ,  G11B7/094 ,  G11B7/0941 ,  G11B7/0945 ,  G11B7/0956 ,  G11B11/10515 ,  G11B11/10576 ,  G11B11/10595

    Abstract: A magneto-optical information recording/reproducing apparatus in which a magneto-optical information recording medium at least including a first magnetic film having perpendicular magnetic anisotropy, and a second magnetic film to which information recorded on the first magnetic film is transferred by irradiation of a laser beam, is used so that a readout laser beam is irradiated onto the second magnetic film to thereby readout the information transferred to the second magnetic film. The apparatus includes a 2-split detection circuit for receiving the readout laser beam reflected from the second magnetic film of the recording medium, and a subtraction circuit in which output signals of the two detection elements of the 2-split detection circuit are subtracted from each other to generate a differential signal. The apparatus further comprises a circuit for making a spot of the laser beam jump one track before readout of the information from the magneto-optical information recording medium, a positive/negative balance correction circuit for detecting an amplitude ratio between positive and negative side amplitudes in a track jump signal generated in the differential signal from the subtraction circuit in response to the track jump to thereby output a correction signal in accordance with the amplitude ratio, and an addition circuit for adding the correction signal to the differential signal to thereby generate a tracking error signal for tracking control used in readout of the magneto-optical information from the magneto-optical information recording medium.

    Abstract translation: 一种磁光信息记录/再现装置，其中至少包括具有垂直磁各向异性的第一磁性膜的磁光信息记录介质和第二磁性膜，通过照射 使用激光束，使得读出的激光束照射到第二磁性膜上，从而读出传递到第二磁性膜的信息。 该装置包括用于接收从记录介质的第二磁性膜反射的读出激光束的二分割检测电路，以及减法电路，其中从每个减去2分割检测电路的两个检测元件的输出信号 另外产生差分信号。 该装置还包括一个电路，用于在从磁光信息记录介质读出信息之前使激光束的点跳跃到一个轨道;正/负平衡校正电路，用于检测正，负振幅之间的振幅比， 响应于轨道跳跃从减法电路产生的差分信号中产生的轨道跳转信号，从而根据振幅比输出校正信号;以及加法电路，用于将校正信号加到差分信号上，从而产生跟踪 用于从磁光信息记录介质读出磁光信息的跟踪控制的误差信号。

    Magneto-optical recording and/or reproducing apparatus having a plurality of optical systems
    22.
    发明授权
    Magneto-optical recording and/or reproducing apparatus having a plurality of optical systems 失效
    具有多个光学系统的磁光记录和/或再现装置

    公开(公告)号：US5784343A

    公开(公告)日：1998-07-21

    申请号：US761755

    申请日：1991-09-16

    Applicant: Tetsu Watanabe ,  Tamotsu Yamagami

    Inventor： Tetsu Watanabe ,  Tamotsu Yamagami

    IPC: G11B11/10 ,  G11B7/135 ,  G11B11/105 ,  G11B11/14 ,  G11B13/04

    CPC classification number: G11B11/10532 ,  G11B11/10552 ,  G11B11/10584 ,  G11B11/10597

    Abstract: A magneto-optical recording and/or reproducing apparatus having a magnetic head and first and second optical systems for recording on and/or reproducing from first and second magneto-optical media. The first optical system has a first objective lens, and the second optical system has a second objective lens whose numerical aperture differs from that of the first objective lens. The magnetic head is arranged near the second objective lens. The first and second optical systems are arranged such that the respective one of the first and second magneto-optical media which is currently being subject to recording or reproducing is positioned between the first and second optical systems.

    Abstract translation: PCT No.PCT / JP91 / 00112 Sec。 371日期1991年9月16日 102（e）1991年9月16日PCT 1991年1月30日PCT PCT。 公开号WO91 / 11806 日期1991年8月8日一种具有磁头和用于在第一和第二磁光介质上记录和/或再现的第一和第二光学系统的磁光记录和/或再现装置。 第一光学系统具有第一物镜，第二光学系统具有与第一物镜的数值孔径不同的第二物镜。 磁头布置在第二物镜附近。 第一和第二光学系统被布置成使得当前正在进行记录或再现的第一和第二磁光介质中的相应一个位于第一和第二光学系统之间。

    Magneto-optical overwrite recording and reproducing system
    28.
    发明授权
    Magneto-optical overwrite recording and reproducing system 失效
    磁光覆盖记录和再现系统

    公开(公告)号：US5488590A

    公开(公告)日：1996-01-30

    申请号：US301045

    申请日：1994-09-06

    Applicant: Tetsu Watanabe ,  Tamotsu Yamagami

    Inventor： Tetsu Watanabe ,  Tamotsu Yamagami

    IPC: G11B11/10 ,  G11B11/105 ,  G11B7/00 ,  G11B11/00

    CPC classification number: G11B11/10513 ,  G11B11/10515 ,  G11B11/10528 ,  G11B11/10584 ,  G11B11/10576

    Abstract: A magneto-optical recording and reproducing system in a magneto-optical disk capable of being overwrite recorded by applying a magnetic field to a photo-sensitive recording layer and irradiating a laser beam onto the recording layer. A track pitch and a diameter of the laser beam are set so that recording tracks to be formed by irradiation of the laser beam overlap, each other between adjacent tracks. Accordingly, data recording density of the magneto-optical disk, especially in a radial direction thereof, can be increased.

    Abstract translation: 能够通过向光敏记录层施加磁场并且将激光照射到记录层上而能够重写的磁光盘中的磁光记录和再现系统。 激光束的轨道间距和直径被设定为使得通过激光束的照射形成的记录轨迹彼此重叠在相邻轨道之间。 因此，可以增加磁光盘的数据记录密度，特别是在其径向方向上的数据记录密度。

    Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus
    29.
    发明授权
    Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus 失效
    磁光拾取装置和磁光记录/再现装置

    公开(公告)号：US5287334A

    公开(公告)日：1994-02-15

    申请号：US808077

    申请日：1991-12-11

    Applicant: Kietsu Iwabuchi ,  Koji Sasaki ,  Tetsu Watanabe ,  Tamotsu Yamagami ,  Yoshio Aoki

    Inventor： Kietsu Iwabuchi ,  Koji Sasaki ,  Tetsu Watanabe ,  Tamotsu Yamagami ,  Yoshio Aoki

    IPC: G11B11/105 ,  G11B5/127

    CPC classification number: G11B11/10584 ,  G11B11/10532 ,  G11B11/10536 ,  G11B11/10554

    Abstract: A magneto-optical pickup apparatus includes an objective lens for focusing a laser beam emitted from a laser device onto a magneto-optical recording medium, driving coils, on which the objective lens is mounted, for driving the objective lens in focusing and tracking directions, and a plate arranged at an end portion of the driving coils between the objective lens and the magneto-optical recording medium. The plate is formed with a coil pattern for generating a magnetic field to be applied to the magneto-optical recording medium, and can allow a laser beam transmitted through the objective lens to pass therethrough.

    Abstract translation: 磁光拾取装置包括用于将从激光装置发射的激光束聚焦到磁光记录介质上的物镜，其上安装有物镜的驱动线圈，用于在聚焦和跟踪方向上驱动物镜， 以及布置在物镜和磁光记录介质之间的驱动线圈的端部处的板。 板形成有用于产生要施加到磁光记录介质的磁场的线圈图案，并且可以允许透过物镜的激光束通过。

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