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67 条记录 (耗时 0.022 秒)

    Optical information reproducing method and apparatus, and optical information recording medium
    41.
    发明公开
    Optical information reproducing method and apparatus, and optical information recording medium 有权
    方法以及用于再现光信息装置，以及光学信息记录介质。

    公开(公告)号：EP2043091A2

    公开(公告)日：2009-04-01

    申请号：EP08016802.4

    申请日：2008-09-24

    申请人： Hitachi Ltd.

    发明人： Ushiyama, Junko ,  Kurokawa, Takahiro ,  Kikugawa, Atsushi ,  Minemura, Hiroyuki ,  Miyamoto, Harukazu

    IPC分类号： G11B7/005 ,  G11B20/10

    CPC分类号： G11B7/005 ,  G11B7/00736 ,  G11B20/10009 ,  G11B20/10027 ,  G11B20/10046 ,  G11B20/10055 ,  G11B20/10296 ,  G11B20/10425 ,  G11B20/22 ,  G11B2007/0013 ,  G11B2220/235 ,  G11B2220/2537

    摘要： Reproduction on an optical recording medium having plural information layers involves the problem of distortion occurring due to interlayer crosstalk and hence deterioration in the quality of a readout signal. At a predetermined radius, a correction coefficient for correcting the amount of fluctuation components is calculated from a readout signal with distortion due to the interlayer crosstalk, and then is stored. The stored correction coefficient is used to eliminate crosstalk components and to correct readout signal fluctuation during reproduction on a predetermined area. In this way, the original readout signal without interlayer crosstalk components can be obtained, so that good-quality reproduction characteristics can be achieved.

    摘要翻译： 到具有多个信息层的光学记录介质的再现涉及到失真发生的由于层间串扰和因此恶化的读出信号的质量的麻烦。 以预定的半径，用于校正的波动成分的量的校正系数从与失真的读出信号，由于层间串扰计算，然后被存储。 存储的校正系数用于消除串扰分量和上的预定区域再现期间校正读出信号的波动。 通过这种方式，没有中间层串扰分量的原始读出信号可以得到，这样高质量的再现特性得以实现。

    Reproducing signal measuring method, signal reproducing apparatus, and optical recording medium
    42.
    发明公开
    Reproducing signal measuring method, signal reproducing apparatus, and optical recording medium 有权
    Wiedergabesignalmessverfahren，Signalwiedergabevorrichtung

    公开(公告)号：EP2026341A1

    公开(公告)日：2009-02-18

    申请号：EP08014160.9

    申请日：2008-08-07

    申请人： Hitachi Ltd.

    发明人： Hirotsune, Akemi ,  Ushiyama, Junko ,  Minemura, Hiroyuki ,  Kurokawa, Takahiro ,  Miyamoto, Harukazu

    IPC分类号： G11B7/005 ,  G11B20/14 ,  G11B7/24

    CPC分类号： G11B7/005 ,  G11B7/24038 ,  G11B20/1217 ,  G11B20/22 ,  G11B2007/0013 ,  G11B2020/1298 ,  G11B2220/235 ,  G11B2220/2537

    摘要： Regarding a signal recorded with a first frequency in a recording area on a specific first recording layer (1203) and a signal recorded with a second frequency different from the first frequency in a recording area on a second recording layer (1204) which might cause interlayer crosstalk in relation to the first recording layer (1203), a reproducing signal measurement method for a multilayer optical recording medium having at least three recording layers (101,102,103,104,105,106) includes reproducing the signal recorded in the recording area on the first recording layer (S1103), separating signals recorded respectively with the first and second frequencies (S1104), discriminating signal amplitude of the first frequency and a maximum value in signal amplitude of the second frequency (S1105), and calculating a signal amplitude ratio between them to measure interlayer crosstalk contained in the signal reproduced from the recording area on the first recording layer (S1106). Thus, the interlayer crosstalk quantity caused by unnecessary light can be measured quantitatively.

    摘要翻译： 关于在特定第一记录层（1203）上的记录区域中以第一频率记录的信号和在第二记录层（1204）上的记录区域中记录有与第一频率不同的第二频率的信号，可能导致中间层 与第一记录层（1203）相关的串扰，具有至少三个记录层（101,102,103,104,105,106）的多层光学记录介质的再现信号测量方法包括再现记录在第一记录层上的记录区域中的信号（S1103） 分离分别以第一和第二频率记录的信号（S1104），识别第一频率的信号幅度和第二频率的信号幅度中的最大值（S1105），并计算它们之间的信号幅度比以测量包含在 从第一记录层上的记录区再现的信号（S1106）。 因此，可以定量地测量由不必要的光引起的层间串扰量。

    Magneto-optical recording and reproducing method, magnetooptical memory apparatus
    50.
    发明公开
    Magneto-optical recording and reproducing method, magnetooptical memory apparatus 失效
    磁 - 光记录和再现方法，磁光存储设备和为此的磁光记录介质。

    公开(公告)号：EP0393652A2

    公开(公告)日：1990-10-24

    申请号：EP90107406.2

    申请日：1990-04-19

    申请人： HITACHI, LTD.

    发明人： Kaku, Toshimitsu ,  Nakamura, Shigeru ,  Takahashi, Masahiko ,  Niihara, Toshio ,  Miyamoto, Harukazu ,  Ohta, Norio ,  Nakao, Takeshi ,  Sukeda, Hirofumi ,  Ojima, Masahiro ,  Toyooka, Takashi ,  Suganuma, Tsuneo ,  Kirino, Fumiyoshi ,  Miyamura, Yoshinori

    IPC分类号： G11B11/10 ,  G11B7/24 ,  G11B13/04

    CPC分类号： G11B11/10584 ,  G11B11/10536 ,  G11B11/10545 ,  G11B11/10593

    摘要： A magnetic field of a polarity corresponding to information to be recorded is applied while a recording spot having a high energy is irradiated to a magneto-opti­cal recording medium (1) to record domains representing the information along a track. The recorded domains (106) are read out by a reproducing spot having a lower energy than the recording spot and a high resolution power along the track. A recording head (11) has an optical system (2 - 9) for irradiating the recording spot having the high energy to the magneto-optical recording medium (1) and a magnetic head (12) for applying a magnetic field having a polarity thereof switched in accordance with the informa­tion to be recorded, to an irradiation area of the recor­ding spot, a reproducing head (300) has an optical system for irradiating the reproducing spot having the low energy by a laser beam having a wavelength of not larger than 600 nm and a magneto-optical signal detector for detecting a displacement of a polarization plane of a reflected light of the reproducing spot to read out the recording domains. The magneto-optical recording medium (1) is made of a recording film having a multi-layer structure (101 - 103) of alternate lamination of metal layers and dielec­tric layers.

    摘要翻译： 而具有高能量记录点被照射到磁 - 光记录介质（1）记录表示沿着轨道的信息域的极性对应于要被记录的信息的磁场施加。 所记录的域（106）是由具有比记录点较低的能量和沿轨道的高分辨率功率的再现点被读出。 的记录头（11）具有在用于照射具有高能量的磁 - 光记录介质（1）和磁头（12），用于施加具有它们的极性的磁场的记录点的光学系统（2-9） 在雅舞的信息来切换要被记录到在记录光斑的照射区域，再现头（300）具有到光学系统，用于通过具有不大于600的波长的激光束照射具有低能量的再生光斑 nm，对于检测再现点的反射光的偏振面的位移来读出所述记录域的磁光信号检测器。 磁 - 光记录介质（1）是由具有金属层和电介质层交替层叠的多层结构（101〜103）的记录的电影。