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    Magneto-optical recording medium comprising first, second and third magnetic layers and method of recording on same
    2.
    发明授权
    Magneto-optical recording medium comprising first, second and third magnetic layers and method of recording on same 失效
    包括第一，第二和第三磁性层的磁光记录介质及其记录方法

    公开(公告)号：US5428585A

    公开(公告)日：1995-06-27

    申请号：US102349

    申请日：1993-08-05

    申请人： Junji Hirokane ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Akira Takahashi ,  Kenji Ohta

    发明人： Junji Hirokane ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Akira Takahashi ,  Kenji Ohta

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

    CPC分类号： G11B11/10586 ,  G11B11/10515 ,  G11B11/10521

    摘要： A magneto-optical recording medium has (1) a first magnetic layer made of a magnetic material which is changed into a vertical magnetization film in response to a temperature rise while is an in-plane magnetization film at a room temperature; (2) a second magnetic layer made of a vertical magnetization film; and (3) a third magnetic layer made of a vertical magnetic film having a higher Curie temperature than that of the second magnetic layer; and (4) a base substrate on which the first, second, and third magnetic layers are luminated in this order. With the arrangement, the optically modulated overwriting can be carried out with respect to the second magnetic layer and it is not necessary to complete the magnetization direction to one direction for each optically modulated overwriting. Moreover, it is possible to reproduce through the first magnetic layer the information which is recorded on a smaller portion than a light beam spot.

    摘要翻译： 磁光记录介质具有：（1）由磁性材料制成的第一磁性层，其响应于温度而变成垂直磁化膜，而在室温下为面内磁化膜; （2）由垂直磁化膜制成的第二磁性层; 和（3）由具有比第二磁性层的居里温度更高的居里温度的垂直磁性膜制成的第三磁性层; 和（4）基底基板，其上依次发光第一，第二和第三磁性层。 通过该配置，可以相对于第二磁性层执行光调制重写，并且对于每个光调制重写，不需要向一个方向完成磁化方向。 此外，可以通过第一磁性层再现记录在比光束点更小的部分上的信息。

    Magneto-optical recording medium
    3.
    发明授权
    Magneto-optical recording medium 失效
    磁光记录介质

    公开(公告)号：US5644566A

    公开(公告)日：1997-07-01

    申请号：US432683

    申请日：1995-05-02

    申请人： Junichiro Nakayama ,  Michinobu Mieda ,  Hiroyuki Katayama ,  Junji Hirokane ,  Akira Takahashi ,  Kenji Ohta

    发明人： Junichiro Nakayama ,  Michinobu Mieda ,  Hiroyuki Katayama ,  Junji Hirokane ,  Akira Takahashi ,  Kenji Ohta

    IPC分类号： G11B11/105 ,  G11B7/00

    CPC分类号： G11B11/10586 ,  G11B11/10517

    摘要： An intermediate layer is formed between a memory layer and a writing layer. The intermediate layer shows in-plane magnetization at room temperature, and perpendicular magnetization within a temperature range within which the coercive force of the memory layer is lower than that of the writing layer. The Curie point of the intermediate layer is lower than that of the memory layer. Like a conventional method, light-intensity modulation overwriting is performed by irradiating laser light whose intensity has been modulated between high level and low level while applying a recording magnetic field after performing an initialization. Even when there are variations in the raised temperature by the irradiation of laser light of high level, it is possible to perform stable overwriting with light-intensity modulation by satisfactorily restraining the exchange forces between the intermediate layer and the writing layer from causing coupling.

    摘要翻译： 在存储层和写入层之间形成中间层。 中间层在室温下显示出平面内的磁化强度，在存储层的矫顽力低于书写层的温度范围内的垂直磁化强度。 中间层的居里点低于存储层的居里点。 像传统方法一样，通过在执行初始化之后照射记录磁场的同时照射强度已经被调制在高电平和低电平之间的激光来执行光强调制重写。 即使通过高水平的激光照射而升高的温度存在变化，也可以通过令人满意地抑制中间层与书写层之间的交换作用而进行光强调制来进行稳定的重写。

    Light modulation method for magneto-optical recording device
    4.
    发明授权
    Light modulation method for magneto-optical recording device 失效
    磁光记录装置的光调制方法

    公开(公告)号：US5422865A

    公开(公告)日：1995-06-06

    申请号：US163355

    申请日：1993-12-07

    申请人： Hiroyuki Katayama ,  Junji Hirokane ,  Junichiro Nakayama ,  Akira Takahashi ,  Kenji Ohta

    发明人： Hiroyuki Katayama ,  Junji Hirokane ,  Junichiro Nakayama ,  Akira Takahashi ,  Kenji Ohta

    IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B13/04

    CPC分类号： G11B11/10506 ,  G11B11/10521

    摘要： A magneto-optical recording method includes the steps of applying an external magnetic field perpendicularly onto the magnetic thin film with perpendicular magnetization of a magneto-optical recording medium and projecting a light beam onto the magneto-optical recording medium; and modulating the intensity of the light beam between the first light intensity and the second light intensity in response to the information to be recorded while shifting a spot of the light beam, thereby recording information. In the above method, the first light intensity is set such that by reducing the coercive force of the magnetic thin film with perpendicular magnetization, a magnetic domain is formed on the magnetic thin film with perpendicular magnetization, and that the magnetic domain is moved as the spot of the light beam is shifted. The second light intensity is set such that by increasing the coercive force of the magnetic thin film with perpendicular magnetization, the magnetic domain is fixed to the position.

    摘要翻译： 磁光记录方法包括以下步骤：利用磁光记录介质的垂直磁化将磁场垂直地施加到磁性薄膜上并将光束投射到磁光记录介质上; 以及响应于要移动光束的点而要记录的信息，调制第一光强度和第二光强度之间的光束的强度，从而记录信息。 在上述方法中，第一光强度被设定为通过以垂直磁化强度降低磁性薄膜的矫顽力，在磁性薄膜上以垂直磁化形成磁畴，并且磁畴作为 光束的光斑被移动。 第二光强度被设定为通过以垂直磁化强度增加磁性薄膜的矫顽力，将磁畴固定在该位置上。

    Method of manufacturing a master plate where its guide groove has an inclined angle
    5.
    发明授权
    Method of manufacturing a master plate where its guide groove has an inclined angle 失效
    制造其导向槽具有倾斜角的主板的方法

    公开(公告)号：US5347510A

    公开(公告)日：1994-09-13

    申请号：US4266

    申请日：1993-01-14

    申请人： Junji Hirokane ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Michinobu Mieda ,  Kenji Ohta

    发明人： Junji Hirokane ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Michinobu Mieda ,  Kenji Ohta

    IPC分类号： G01Q80/00 ,  G11B7/007 ,  G11B7/24 ,  G11B7/26

    CPC分类号： G11B7/24076 ,  G11B7/261

    摘要： A master plate for manufacturing a stamper for injecting molding of an optical memory device has a substrate having a plurality of guiding grooves on a surface thereof with a predetermined interval. The respective edge portions of the guiding grooves are inclined with respect to the surface of the substrate at an angle not more than 30.degree.. According to a manufacturing method of the master plate, the post-baking process is carried out at a baking temperature of not less than 150.degree. C. and an etching gas containing O.sub.2 gas of 4 (SCCM) to 10 (SCCM) is used. Thus, even when the copying is carried out with respect to the substrate of the optical memory device according to the injection molding process wherein the stamper, which is manufactured based on the above-mentioned master plate, is used, the mold release of the stamper can be carried out without being caught by the substrate. Thus, it is possible to keep the respective shapes of the guiding grooves of the s tamper, thereby enabling of manufacturing the substrate of the optical memory device with high repeatability.

    摘要翻译： 用于制造用于注射成型光学存储器件的压模的母板具有在其表面上以预定间隔具有多个导向槽的衬底。 引导槽的各个边缘部分相对于基板的表面以不大于30°的角度倾斜。 根据主板的制造方法，后烘烤处理在不低于150℃的烘烤温度下进行，并且使用含有4（SCCM）至10（SCCM）的O 2气体的蚀刻气体。 因此，即使在使用根据上述主板制造的压模的注射成型工艺相对于光学存储器件的基板进行复印时，压模的脱模 可以在不被基材捕获的情况下进行。 因此，可以保持篡改器的引导槽的各自的形状，从而能够以高重复性制造光学存储器件的基板。

    Magneto-optical recording method of overwriting without requiring an initialization magnet
    6.
    发明授权
    Magneto-optical recording method of overwriting without requiring an initialization magnet 失效
    重写磁光记录方法，不需要初始化磁铁

    公开(公告)号：US5402408A

    公开(公告)日：1995-03-28

    申请号：US964428

    申请日：1992-10-21

    申请人： Junji Hirokane ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Michinobu Mieda ,  Kenji Ohta

    发明人： Junji Hirokane ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Michinobu Mieda ,  Kenji Ohta

    IPC分类号： G11B11/105 ,  G11B11/10 ,  G11B7/24

    CPC分类号： G11B11/10584 ,  G11B11/10506 ,  G11B11/10519 ,  G11B11/10586

    摘要： A magneto-optical recording method for rewriting of information including the steps of projecting a light beam, whose intensity varies in response to information to be recorded, onto a magnetic thin film with perpendicular magnetization while an external magnetic field of a constant intensity is being applied thereto; and arranging the magnetization direction of an area irradiated with the light beam of the magnetic thin film with perpendicular magnetization in the direction of the external magnetic field when projecting the light beam of high intensity, while arranging it in the direction of demagnetizing field, opposite to the direction of the external magnetic field generated by magnetization in the vicinity of the irradiated area when projecting the light beam of low intensity, and a magneto-optical memory element provided with a base whereon the magnetic thin film with perpendicular magnetization and an in-plane magnetization film are formed. With the above arrangement, an overwriting operation can be carried out through light intensity modulation without requiring an initialization magnet.

    摘要翻译： 一种用于重写信息的磁光记录方法，包括以下步骤：将强度随着要记录的信息而变化的光束投射到具有恒定强度的外部磁场的垂直磁化的磁性薄膜上， 到; 以及当投射高强度光束时，沿着外部磁场的方向，使磁性薄膜的光束照射的区域的磁化方向排列成与退磁场相反的方向 当投射低强度光束时，在照射区域附近由磁化产生的外部磁场的方向以及设置有具有垂直磁化和平面内的磁性薄膜的基底的磁光存储元件 形成磁化膜。 通过上述配置，可以通过光强调制而不需要初始化磁体来进行重写操作。

    Magneto-optical recording method using the relation of beam diameter and an aperture of converging lens
    8.
    发明授权
    Magneto-optical recording method using the relation of beam diameter and an aperture of converging lens 失效
    使用光束直径与会聚透镜孔径的磁光记录方法

    公开(公告)号：US06483785B1

    公开(公告)日：2002-11-19

    申请号：US09685829

    申请日：2000-10-10

    申请人： Yoshiteru Murakami ,  Junji Hirokane ,  Junichiro Nakayama ,  Junsaku Nakajima ,  Akira Takahashi ,  Kenji Ohta ,  Naoyasu Iketani

    发明人： Yoshiteru Murakami ,  Junji Hirokane ,  Junichiro Nakayama ,  Junsaku Nakajima ,  Akira Takahashi ,  Kenji Ohta ,  Naoyasu Iketani

    IPC分类号： G11B1100

    CPC分类号： G11B7/126 ,  G11B7/00718 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10517 ,  G11B11/10543 ,  G11B11/10584 ,  G11B11/10586 ,  G11B11/10595 ,  Y10S428/90

    摘要： Featured is a recording and reproducing method for recording and reproducing information on and from a recording medium. The medium includes a base having a property that a light can be transmitted therethrough, a readout layer formed on the base, which has an in-plane magnetization at room temperature, whereas, a transition occurs from in-plane magnetization to perpendicular magnetization as temperature rises and a recording layer formed on said readout layer for recording thereon information magneto-optically. A groove for guiding a light beam is formed on a readout layer side of the base and a groove width is set substantially equal to a land width formed between grooves. The recording layer on the grooves and the recording layer on lands are used in recording and reproducing information. Further a light beam is incident on a converging lens of an optical head, the light beam having a larger diameter &ohgr; than an aperture &agr; of the converging lens for converging the light beam on a predetermined position of the magneto-optical recording medium.

    摘要翻译： 特色是用于在记录介质上记录和再现信息的记录和再现方法。 该介质包括具有光可以透射的性质的基底，形成在基底上的读出层，其在室温下具有面内磁化强度，而从平面内磁化转变为垂直磁化转变为温度 并且在所述读出层上形成用于在其上记录光学信息的记录层。 在基板的读出层侧形成用于引导光束的槽，并且将槽宽度设定为与槽之间形成的焊盘宽度大致相等。 凹槽上的记录层和焊盘上的记录层用于记录和再现信息。 此外，光束入射到光学头的会聚透镜上，所述光束具有比会聚透镜的孔径α更大的直径Ω，用于将光束会聚在磁光记录介质的预定位置。

    Magneto-optical recording medium and method of recording and reproducing using the same
    9.
    发明授权
    Magneto-optical recording medium and method of recording and reproducing using the same 失效
    磁光记录介质及使用其的记录和再现方法

    公开(公告)号：US5683803A

    公开(公告)日：1997-11-04

    申请号：US433088

    申请日：1995-05-03

    申请人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi ,  Kenji Ohta

    发明人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi ,  Kenji Ohta

    IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B5/66 ,  B32B5/16

    CPC分类号： G11B11/10586 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10523 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

    摘要： A magneto-optical recording medium includes a first magnetic layer and a second magnetic layer being laminated. When information is to be recorded on the first magnetic layer, first, a magnetization direction in the second magnetic layer is arranged in one direction with an application of an initialization magnetic field. Then, an intensity modulated light beam is projected while applying thereto a recording magnetic field so as to change the magnetization direction in the second magnetic layer. Thereafter, the magnetization direction in the second magnetic layer is copied to the first magnetic layer, thereby recording information. The first magnetic layer has a magnetization in an intermediate direction between a perpendicular direction and an in-plane direction at room temperature, while has a perpendicular magnetization at above a predetermined temperature. Therefore, a smaller exchange coupling force is exerted from the first magnetic layer to the second magnetic layer at room temperature, thereby enabling a rewriting information with a smaller initialization magnetic field compared with the conventional method, thereby achieving a reduction in size of the apparatus and power conservation.

    摘要翻译： 磁光记录介质包括层叠的第一磁性层和第二磁性层。 当要在第一磁性层上记录信息时，首先，通过施加初始化磁场，将第二磁性层中的磁化方向布置在一个方向上。 然后，施加强度调制光束，同时向其施加记录磁场，以改变第二磁性层中的磁化方向。 此后，将第二磁性层中的磁化方向复制到第一磁性层，从而记录信息。 第一磁性层在室温下具有在垂直方向和面内方向之间的中间方向上的磁化强度，同时具有高于预定温度的垂直磁化强度。 因此，与常规方法相比，在室温下从第一磁性层向第二磁性层施加较小的交换耦合力，从而能够实现与常规方法相比具有较小初始化磁场的重写信息，从而实现装置的尺寸减小 省电。