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36 条记录 (耗时 0.033 秒)

    Method for reproducing optical disk
    5.
    发明授权
    Method for reproducing optical disk 失效
    光盘再现方法

    公开(公告)号：US5909412A

    公开(公告)日：1999-06-01

    申请号：US977206

    申请日：1997-11-24

    申请人： Junichiro Nakayama ,  Naoyasu Iketani ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Akira Takahashi

    发明人： Junichiro Nakayama ,  Naoyasu Iketani ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Akira Takahashi

    IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B27/19 ,  G11B27/30 ,  G11B17/22

    CPC分类号： G11B7/24082 ,  G11B27/19 ,  G11B27/3027 ,  G11B7/0903 ,  G11B7/0938

    摘要： In a method for reproducing an optical disk of the present invention, address information of an optical disk, provided with tracking guides composed of (1) a wobbling groove wobbled in accordance with address information and (2) a normal groove which is not wobbled, is reproduced. The wobbling groove and the normal groove are alternately provided in a radius direction of the optical disk. When carrying out recording and reproducing of the optical disk, three beams composed of one main beam and two sub beams are used. The three beams are projected so that (a) the sub beams are respectively on the wobbling groove and the normal groove and (b) the main beam is on a land between the wobbling groove and the normal groove. The address information is found from reflected light of one of the sub beams. The above arrangement allows respective central portions of the sub beams to track the tracking guides. Therefore, even in the case where the optical disk is tilted or vibrated, the sub beams do not deviate totally off the tracking guides, thereby permitting to stably reproduce the address information.

    摘要翻译： 在本发明的再现光盘的方法中，具有由（1）根据地址信息摆动的摆动槽和（2）未摆动的正常槽构成的跟踪引导件的光盘的地址信息， 被转载。 在光盘的半径方向交替设置摆动槽和法线槽。 当执行光盘的记录和再现时，使用由一个主光束和两个子光束组成的三个光束。 这三个光束被投影，使得（a）子光束分别位于摆动槽和普通槽上，（b）主光束位于摆动槽和正常槽之间的焊盘上。 从一个子光束的反射光中找到地址信息。 上述布置允许子光束的各个中心部分跟踪跟踪引导件。 因此，即使在光盘倾斜或振动的情况下，子光束也不完全偏离跟踪引导件，从而允许稳定地再现地址信息。

    Magneto-optical recording medium having intermediate layer of in plane magnetization
    7.
    发明授权
    Magneto-optical recording medium having intermediate layer of in plane magnetization 有权
    具有平面磁化中间层的磁光记录介质

    公开(公告)号：US06272077B1

    公开(公告)日：2001-08-07

    申请号：US09479256

    申请日：2000-01-07

    申请人： Akira Takahashi ,  Michinobu Mieda ,  Naoyasu Iketani ,  Go Mori ,  Junsaku Nakajima ,  Yoshiteru Murakami ,  Junji Hirokane

    发明人： Akira Takahashi ,  Michinobu Mieda ,  Naoyasu Iketani ,  Go Mori ,  Junsaku Nakajima ,  Yoshiteru Murakami ,  Junji Hirokane

    IPC分类号： G11B1110

    CPC分类号： G11B11/10584 ,  G11B11/10515 ,  G11B11/10586 ,  G11B11/10593

    摘要： A magneto-optical memory medium according to the present invention comprises a reproducing layer, which has in-plane magnetization at room temperature and perpendicular magnetization when heated to above a predetermined temperature by a reproducing light beam; a recording layer, which is magnetostatically coupled to the reproducing layer; and an in-plane magnetized layer, provided adjacent to the recording layer, which has a Curie temperature at the above-mentioned predetermined temperature. In this medium, at temperatures below the predetermined temperature, signals recorded at high density in the recording layer are masked, and the above-mentioned magnetostatic coupling is suppressed, by magnetic masking by the in-plane magnetized layer. At temperatures above the predetermined temperature, however, within a domain forming part of the in-plane magnetized layer, the recording layer and the reproducing layer are magnetostatically coupled, and a recording bit of the recording layer is copied and expanded to a magnetic domain in the reproducing layer. Accordingly, with this medium, by reproducing from an expanded magnetic domain of the reproducing layer, even information from recording bits recorded at high density can be reproduced with high signal quality.

    摘要翻译： 根据本发明的磁光存储介质包括再现层，其在室温下具有面内磁化并且通过再现光束被加热到高于预定温度时的垂直磁化; 记录层，其被静磁耦合到再现层; 以及与记录层相邻的面内磁化层，居里温度在上述预定温度。 在该介质中，在低于预定温度的温度下，记录层中以高密度记录的信号被屏蔽，并且通过面内磁化层的磁屏蔽来抑制上述静磁耦合。 然而，在高于预定温度的温度下，在形成面内磁化层的一部分的区域内，磁静电耦合记录层和再现层，并且将记录层的记录位复制并扩展到磁畴中 再现层。 因此，利用该介质，通过从再现层的扩展磁畴再现，可以以高信号质量再现以高密度记录的记录位的信息。

    Magneto-optical recording medium having intermediate layer of in-plane magnetization
    8.
    发明授权
    Magneto-optical recording medium having intermediate layer of in-plane magnetization 失效
    具有平面内磁化中间层的磁光记录介质

    公开(公告)号：US06147939A

    公开(公告)日：2000-11-14

    申请号：US32985

    申请日：1998-03-02

    申请人： Akira Takahashi ,  Michinobu Mieda ,  Naoyasu Iketani ,  Go Mori ,  Junsaku Nakajima ,  Yoshiteru Murakami ,  Junji Hirokane

    发明人： Akira Takahashi ,  Michinobu Mieda ,  Naoyasu Iketani ,  Go Mori ,  Junsaku Nakajima ,  Yoshiteru Murakami ,  Junji Hirokane

    IPC分类号： G11B11/105 ,  G11B11/00

    CPC分类号： G11B11/10584 ,  G11B11/10515 ,  G11B11/10586 ,  G11B11/10593

    摘要： A magneto-optical memory medium according to the present invention comprises a reproducing layer, which has in-plane magnetization at room temperature and perpendicular magnetization when heated to above a predetermined temperature by a reproducing light beam; a recording layer, which is magnetostatically coupled to the reproducing layer; and an in-plane magnetized layer, provided adjacent to the recording layer, which has a Curie temperature at the above-mentioned predetermined temperature. In this medium, at temperatures below the predetermined temperature, signals recorded at high density in the recording layer are masked, and the above-mentioned magnetostatic coupling is suppressed, by magnetic masking by the in-plane magnetized layer. At temperatures above the predetermined temperature, however, within a domain forming part of the in-plane magnetized layer, the recording layer and the reproducing layer are magnetostatically coupled, and a recording bit of the recording layer is copied and expanded to a magnetic domain in the reproducing layer. Accordingly, with this medium, by reproducing from an expanded magnetic domain of the reproducing layer, even information from recording bits recorded at high density can be reproduced with high signal quality.

    摘要翻译： 根据本发明的磁光存储介质包括再现层，其在室温下具有面内磁化并且通过再现光束被加热到高于预定温度时的垂直磁化; 记录层，其被静磁耦合到再现层; 以及与记录层相邻的面内磁化层，居里温度在上述预定温度。 在该介质中，在低于预定温度的温度下，记录层中以高密度记录的信号被屏蔽，并且通过面内磁化层的磁屏蔽来抑制上述静磁耦合。 然而，在高于预定温度的温度下，在形成面内磁化层的一部分的区域内，磁静电耦合记录层和再现层，并且将记录层的记录位复制并扩展到磁畴中 再现层。 因此，利用该介质，通过从再现层的扩展磁畴再现，可以以高信号质量再现以高密度记录的记录位的信息。

    Optical disk having virtually constant width recording track and optical disk apparatus
    9.
    发明授权
    Optical disk having virtually constant width recording track and optical disk apparatus 失效
    具有实际上恒定宽度的记录轨道和光盘装置的光盘

    公开(公告)号：US06122233A

    公开(公告)日：2000-09-19

    申请号：US15011

    申请日：1998-01-28

    申请人： Naoyasu Iketani ,  Go Mori ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Junji Hirokane ,  Akira Takahashi

    发明人： Naoyasu Iketani ,  Go Mori ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Junji Hirokane ,  Akira Takahashi

    IPC分类号： G11B7/24 ,  G11B7/00 ,  G11B7/005 ,  G11B7/007 ,  G11B11/105 ,  G11B7/09

    CPC分类号： G11B7/00745 ,  G11B11/10563 ,  G11B11/10565 ,  G11B7/00718

    摘要： In an optical disk, grooves and lands serving as recording tracks are provided, the grooves are shaped so as to have virtually the same width, and in a first region, the two side walls of each groove wind in accordance with address information. The first region of the groove is formed with its leading portion located at the same angular position as the leading portion of at least one of the first regions of the adjacent grooves. Moreover, the winding portions corresponding to respective bits of the address information are formed in a manner so as to synchronize to the adjacent grooves. With this arrangement, it becomes possible to easily detect address information from the grooves and lands, and consequently to obtain an information reproducing signal with high quality.

    摘要翻译： 在光盘中，设置有用作记录轨迹的凹槽和凹槽，这些凹槽成形为具有实质上相同的宽度，并且在第一区域中，每个凹槽的两个侧壁根据地址信息而变风。 凹槽的第一区域形成有其前端部分位于与相邻凹槽的第一区域中的至少一个的前端部分相同的角位置。 此外，与地址信息的各个位对应的绕组部分以与相邻槽同步的方式形成。 利用这种布置，可以容易地从凹槽和平台检测地址信息，从而获得高质量的信息再现信号。