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    Magneto-optical recording method of overwriting without requiring an initialization magnet
    3.
    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 medium
    4.
    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。

    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 medium having magnetization variable between in-plane magnetization and perpendicular magnetization
    6.
    发明授权
    Magneto-optical recording medium having magnetization variable between in-plane magnetization and perpendicular magnetization 失效
    具有在面内磁化和垂直磁化之间的磁化可变的磁光记录介质

    公开(公告)号：US5629908A

    公开(公告)日：1997-05-13

    申请号：US536168

    申请日：1995-09-29

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

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

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

    CPC分类号： G11B11/10586 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10521 ,  G11B11/10595

    摘要： A magneto-optical recording medium comprising a readout layer, an intermediate layer, and a recording layer. Two light beams having high and low light intensities respectively are applied while applying an external magnetic field. The magnetization direction of the recording layer is changed according to information, by reversing the sub-lattice magnetic moment of the readout layer in the case of the high light intensity. The intermediate layer exhibits a perpendicular magnetization during the irradiation, and also exhibits an in-plane magnetization at room temperature. Since it is not necessary to provide a device for generating a magnetic field for initializing every recording, it is possible to avoid increase in the size of the recording and reproducing apparatus. Moreover, the magnetization direction of the readout layer can be easily controlled with an external magnetic field, and the optical modulation overwriting property can be stabilized.

    摘要翻译： 包括读出层，中间层和记录层的磁光记录介质。 在施加外部磁场的同时施加具有高和低光强度的两个光束。 在高光强度的情况下，通过反转读出层的亚晶格磁矩，根据信息改变记录层的磁化方向。 中间层在照射期间表现出垂直磁化，并且在室温下也表现出平面内的磁化强度。 由于不需要提供用于产生用于初始化每个记录的磁场的装置，因此可以避免记录和再现装置的尺寸的增加。 此外，可以通过外部磁场容易地控制读出层的磁化方向，并且可以稳定光学调制重写特性。

    Magneto-optical recording medium having two reproduction layers and a method for reproducing thereof
    9.
    发明授权
    Magneto-optical recording medium having two reproduction layers and a method for reproducing thereof 失效
    具有两个再现层的磁光记录介质及其再现方法

    公开(公告)号：US5633838A

    公开(公告)日：1997-05-27

    申请号：US582481

    申请日：1996-01-03

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

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

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

    CPC分类号： G11B11/10515 ,  G11B11/10586

    摘要： A non-magnetic intermediate layer is provided between a reproductive layer and a recording layer. The reproductive layer is composed of a first reproductive layer and a second reproductive layer. When the first reproductive layer has a temperature that is higher than a first critical temperature, its stable magnetic domain width becomes smaller than a recording magnetic domain width so that the magnetization is reversed. When the second reproductive layer has a temperature that is higher than a second critical temperature, its stable magnetic domain width becomes larger than the recording magnetic domain width so that the reversed magnetic domain is collapsed. The first critical temperature is lower than the second critical temperature. A reproductive output having abrupt rising and falling can be obtained by the generation and the collapse of the reverse magnetic domain on the reproductive layer. For this reason, higher density recording required for larger capacity can be achieved.

    摘要翻译： 在生殖层和记录层之间设置非磁性中间层。 生殖层由第一生殖层和第二生殖层组成。 当第一生殖层具有高于第一临界温度的温度时，其稳定的磁畴宽度变得小于记录磁畴宽度，使得磁化反转。 当第二生殖层具有高于第二临界温度的温度时，其稳定的磁畴宽度变得大于记录磁畴宽度，使得反向磁畴被折叠。 第一临界温度低于第二临界温度。 具有突然上升和下降的生殖输出可以通过生殖层上的反向磁畴的产生和崩溃获得。 为此，可以实现更大容量所需的更高密度的记录。