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    Information recording-reproducing method and magneto-optical medium
    1.
    发明公开
    Information recording-reproducing method and magneto-optical medium 审中-公开
    Verfahren zur Informationsaufzeichnung / -wiedergabe und magnetooptisches Medium

    公开(公告)号：EP0899726A3

    公开(公告)日：2000-03-15

    申请号：EP98306870.1

    申请日：1998-08-27

    申请人： CANON KABUSHIKI KAISHA

    发明人： Fujii, Eiichi ,  Yamamoto, Masakuni ,  Shiratori, Tsutomu ,  Miyaoka, Yasuyuki

    IPC分类号： G11B11/10

    CPC分类号： G11B11/10508 ,  G11B11/10515 ,  G11B11/10528 ,  G11B11/10586

    摘要： Disclosed herein is an information recording-reproducing method, wherein a domain wall is displaced on a recording medium in which information has been recorded, thereby conducting the reproduction of the information, the method comprising, projecting a light spot on the recording medium, relatively moving the light spot and the recording medium, applying a magnetic field modulated according to the information to the site projected by the light spot to form record marks the maximum mark length of which is at most 0.15 times the spot size of the light spot and displacing the domain wall from the front to the back of the moving direction of the light spot by a temperature distribution formed on the recording medium by the light spot, and at the same time detecting the displacement of the domain wall from reflected light of the light spot, thereby detecting the record marks.

    摘要翻译： 本文公开了一种信息记录再现方法，其中域壁在已经记录信息的记录介质上移位，从而进行信息的再现，该方法包括：将光点投影在记录介质上，相对移动 光点和记录介质，将根据该信息调制的磁场施加到由光点投射的位置，以形成最大标记长度为光斑大小的至多0.15倍的记录标记， 通过由光点在记录介质上形成的温度分布，从光斑的移动方向的前方到后方的畴壁，同时检测畴壁从光斑的反射光的位移， 从而检测记录标记。

    Apparatus and system for recording on a magnetooptical recording medium
    5.
    发明公开
    Apparatus and system for recording on a magnetooptical recording medium 失效
    金属和金属矿物Aufzeichnungsmedium

    公开(公告)号：EP0838815A3

    公开(公告)日：1998-06-17

    申请号：EP98200007.7

    申请日：1987-07-08

    申请人： CANON KABUSHIKI KAISHA

    发明人： Osato, Yochi ,  Kawade, Hisaaki ,  Fujii, Eiichi ,  Kasama, Nobuhiro ,  Kobayashi, Tadashi

    IPC分类号： G11B11/10

    CPC分类号： G11B11/10506 ,  G11B11/10519 ,  G11B11/10586 ,  G11B11/10591 ,  Y10T428/26

    摘要： The medium (11) is provided with a first magnetic layer (2) and at least a second magnetic layer (3) having a higher Curie point temperature (Tc) and a lower coercive force than those of said first magnetic layer and being exchange coupled with said first magnetic layer is disclosed satisfying a relation: H H > H L > σ w 2M s h wherein H H is the coercive force of the first magnetic layer; H L is the coercive force of the second magnetic layer; M s is the saturation magnetization of the second magnetic layer; h is the thickness thereof; and σ w is the magnetic wall energy between the first and second magnetic layers. A recording method of such recording medium applies a magnetic field (B1) whilst irradiating the medium with a light beam (15)

    摘要翻译： 该装置和系统包括具有第一磁性层（2）和至少第二磁性层（3）的介质（11），具有比所述第一磁性层（2）更高的居里点温度（Tc）和较低的矫顽力（HL） 第一磁性层并且与所述第一磁性层交换耦合，满足以下关系：其中HH是第一磁性层的矫顽力; HL是第二磁性层的矫顽力; Ms是第二磁性层的饱和磁化强度; h是其厚度; 并且σw是第一和第二磁性层之间的磁壁能量，用于用调制光束照射介质（11）的装置（6,14,22）和用于向介质施加磁场的装置（24）。

    Magneto-optical medium and signal reproducing method and apparatus
    8.
    发明公开
    Magneto-optical medium and signal reproducing method and apparatus 失效
    一种磁光介质，和信号再现方法和装置

    公开(公告)号：EP0831474A3

    公开(公告)日：1998-08-26

    申请号：EP97307216.8

    申请日：1997-09-17

    申请人： CANON KABUSHIKI KAISHA

    发明人： Fujii, Eiichi ,  Shiratori, Tsutomu

    IPC分类号： G11B11/10

    CPC分类号： G11B11/10515 ,  G11B11/10584 ,  G11B11/10586

    摘要： A magneto-optical recording medium includes a first magnetic layer of which the magnetic wall moves and which contributes to reproduction, a third magnetic layer in which information is accumulated, and a second magnetic layer disposed between the first and third magnetic layers and having a lower Curie temperature than those of the first and third magnetic layers. The following is satisfied at the lowest temperature Ts whereat the exchange-coupling between the first and third magnetic layers is cut: | k1∗dσw1/dT | >2∗Ms1∗Hw1> | k2∗dσw1/dT | | k1∗dσw3/dT | >2∗Ms3∗Hw3 σw1 ... magnetic wall energy density of the first magnetic layer represented by cgs unit system Ms1 ... saturation magnetization of the first magnetic layer represented by cgs unit system Hw1 ... magnetic wall coercivity of the first magnetic layer represented by cgs unit system σw3 ... magnetic wall energy density of the third magnetic layer represented by cgs unit system Ms3 ... saturation magnetization of the third magnetic layer represented by cgs unit system Hw3 ... magnetic wall coercivity of the third magnetic layer represented by cgs unit system k1 ... one temperature gradient of a temperature profile formed on the medium k2 ... the other temperature gradient of the temperature profile formed on the medium.

    Magnetooptical recording medium allowing overwriting with two or more magnetic layers and recording method utilizing the same
    10.
    发明公开
    Magnetooptical recording medium allowing overwriting with two or more magnetic layers and recording method utilizing the same 失效
    具有带有两个或更多的磁性层覆盖的可能性，并使用该介质的记录方法的磁光记录介质

    公开(公告)号：EP0838814A2

    公开(公告)日：1998-04-29

    申请号：EP98200006.9

    申请日：1987-07-08

    申请人： CANON KABUSHIKI KAISHA

    发明人： Osato, Yoichi ,  Kawade, Hisaaki ,  Fujii, Eiichi ,  Kasama, Nobuhiro ,  Kobayashi, Tadashi

    IPC分类号： G11B11/10

    CPC分类号： G11B11/10506 ,  G11B11/10519 ,  G11B11/10586 ,  G11B11/10591 ,  Y10T428/26

    摘要： This apparatus and system comprise a medium (11) provided with a first magnetic layer (2) and at least a second magnetic layer (3) having a higher Curie point temperature (Tc) and a lower coercive force (H L ) than those of said first magnetic layer and being exchange coupled with said first magnetic layer satisfying a relation: H H > H L > σ w 2M s h wherein H H is the coercive force of the first magnetic layer; H L is the coercive force of the second magnetic layer; M s is the saturation magnetization of the second magnetic layer; h is the thickness thereof; and σ w is the magnetic wall energy between the first and second magnetic layers, means (6,14,22) for irradiating the medium (11) with a modulated light beam and means (24) for applying magnetic fields to the medium.

    摘要翻译： 该设备和系统包括设置有第一磁性层的介质（11）（2）和至少一个第二磁性层（3）具有比那些。所述的较高居里点温度（Tc）和下矫顽力（HL） 第一磁性层和加上满足关系所述第一磁性层是交换： worin HH是第一磁层的矫顽力; HL是第二磁性层的矫顽力; Ms为所述第二磁性层的饱和磁化强度; h是其厚度; 和sigma w是所述第一和第二磁性层之间的磁壁能量的装置（6,14,22），用于照射用于施加磁场到所述介质的调制光束和装置（24）的介质（11）。