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    Optical disk, optical recording/reproducing apparatus and optical recording/reproducing method
    14.
    发明公开
    Optical disk, optical recording/reproducing apparatus and optical recording/reproducing method 失效
    光盘驱动器，光学记录/再现设备和光记录/再现方法

    公开(公告)号：EP0999544A2

    公开(公告)日：2000-05-10

    申请号：EP99123442.8

    申请日：1996-02-09

    申请人： Hitachi, Ltd.

    发明人： Miyamoto, Harukazu ,  Minemura, Hiroyuki ,  Sugiyama, Hisataka

    IPC分类号： G11B7/09 ,  G11B7/007 ,  G11B11/105

    CPC分类号： G11B11/10565 ,  G11B7/0053 ,  G11B7/00718 ,  G11B7/00745 ,  G11B7/0079 ,  G11B7/0901 ,  G11B7/0938 ,  G11B7/094 ,  G11B7/24079 ,  G11B7/24085 ,  G11B7/26 ,  G11B11/10576 ,  G11B11/10578 ,  G11B11/10584 ,  G11B27/19 ,  G11B27/24 ,  G11B27/3027 ,  G11B2220/216 ,  G11B2220/2525

    摘要： In an optical disk recording medium having grooves (84) and lands (85) formed on a substrate and information recording areas formed in association with both the groove and the land, first prepit portions (833) representing VFO information and second prepit portions (834) representing address information are disposed on a virtual extensions of the boundaries between grooves (84) and lands (85), and the prepits are disposed to satisfy such requirements that the prepits are disposed on both sides of a virtual extension of the center line of a groove, that the prepits are disposed on both sides of a virtual extension of a center line of a land, that the prepits do not exist on both sides of a given position on the center line of the groove, and that the prepits do not exist on both sides of a given position on the center line of the land. When an optical spot scans a track, pits on either one side or the other are reproduced and crosstalk does not occur between adjacent tracks. Also claimed are an optical recording/reproducing apparatus and an optical recording/reproducing method in which the irradiation position (tracking) of an optical spot on such a medium is controlled on the basis of the amplitude of the VFO signal.

    摘要翻译： 在具有形成在与两个表示VFO信息和第2小坑部槽和脊，第一预制凹坑部（833）结合而形成一个基底和信息记录区的槽（84）和平台（85）的光盘记录介质（834 ）表示的地址信息被设置在虚拟边界的槽间（84），85）的扩展和土地（和预制凹坑被布置为满足搜索要求没有预凹坑上的中心线的假想延长的bothsides处理完毕 凹槽，DASS模预制凹坑被布置在一个国家的一个中心线的假想延长的bothsides，并预凹坑不上的槽的中心线上的给定位置的bothsides存在，并没有预凹坑不 存在于在纹的中心线上的给定位置的bothsides。 当光点扫描的轨道，在任一方或其他凹坑被重放和串音不相邻轨道之间发生。 所以要求保护的是在光学记录/再现装置和在其中的光点上求介质中的照射位置（跟踪）是VFO信号的幅度的基础上控制的光学记录/再现方法。

    Magneto-optical system
    18.
    发明公开
    Magneto-optical system 失效
    Magneto-optische Scheibe。

    公开(公告)号：EP0368194A2

    公开(公告)日：1990-05-16

    申请号：EP89120477.8

    申请日：1989-11-06

    申请人： HITACHI, LTD. ,  Hitachi Maxell Ltd.

    发明人： Kirino, Fumiyoshi Sanikopo Takaidohigashi 401 ,  Miyamoto, Harukazu ,  Okamine, Shigenori ,  Ogihara, Noriyuki ,  Takahashi, Masahiko ,  Ohta, Norio ,  Niihara, Toshio

    IPC分类号： G11B11/10

    CPC分类号： G11B11/1053 ,  G11B11/10508 ,  G11B11/10519 ,  G11B11/10586 ,  G11B11/10589 ,  G11B11/10591 ,  G11B11/10593 ,  Y10S428/90

    摘要： In a magneto-optical disk for recording, reproduction or erasing with a laser beam, which comprises a film of four-layer structure consisting of a first dielectric layer (2), a magneto-optical recording layer (3), a second dielectric layer (4) and a metallic layer (5), laid on a disk substrate (1) provided with guide tracks, temperature distribution of the magneto-optical recording layer (3) is controlled by controlling the thermal diffusivity of the metallic layer (5), and recording/reproduction/erasing repetition characteristics are improved thereby. In the disk of the present structure, the temperature is elevated in a broader area from the center of laser beam, and thus a thoroughly broad erasing domain width taking a track offset into account can be obtained and not recording domains remain after the erasing. The reproduced signal output is increased by 4 dB, as compared with that obtained by a disk of three-layer structure without any metallic layer, because the beam utilization efficiency is increased owing to both Kerr effect and Faraday effect. When the disk of the present structure is subjected to field modulation recording, tails of arrow-feather-shaped recording domains peculiar to the field modulation recording can be shortened and interbit interferences can be overcome, resulting in an increase in C/N (S/N) ratio and the high density recording can be made. By endowing a Kerr enhancement action to the second dielectric layer (4) and a protective action on the magneto-optical layer (3) to the first dielectric layer (2), only the reliability can be improved without lowering the C/N ratio. By improving the corrosion resistance of the magneto-optical recording layer, the first dielectric layer (2) can be omitted to the contrary, and a magneto-optical disk of simple structure can be obtained and used as memory for domestic applications or communication fields.

    摘要翻译： 在用于用激光束进行记录，再现或擦除的磁光盘中，其包括由第一介电层（2），磁光记录层（3），第二电介质层 （4）和设置有导轨的盘基板（1）上的金属层（5），通过控制金属层（5）的热扩散率来控制磁光记录层（3）的温度分布， ，并且由此提高记录/再现/擦除重复特性。 在本结构的盘中，从激光束的中心向温度升高的范围，因此可以获得考虑到磁道偏移的彻底宽的擦除域宽度，并且在擦除之后不会保留记录域。 与由没有任何金属层的三层结构的盘相比，再现信号输出增加了4dB，因为由于克尔效应和法拉第效应都增加了光束利用效率。 当对本结构的盘进行现场调制记录时，可以缩短场调制记录特有的箭头形状的记录区的尾部，并克服间隙干扰，导致C / N（S / N）比，并且可以进行高密度记录。 通过向第二电介质层（4）赋予克尔增强作用和对第一电介质层（2）的磁光层（3）的保护作用，仅在不降低C / N比的情况下可以提高可靠性。 通过提高磁光记录层的耐腐蚀性，可以省略第一介电层（2），并且可以获得简单结构的磁光盘并将其用作家用或通信领域的存储器。

    Optical disc apparatus
    20.
    发明公开
    Optical disc apparatus 有权
    光盘设备

    公开(公告)号：EP1860655A3

    公开(公告)日：2008-01-23

    申请号：EP07009245.7

    申请日：2007-05-08

    申请人： Hitachi, Ltd.

    发明人： Shimano, Takeshi ,  Miyamoto, Harukazu

    IPC分类号： G11B7/135

    CPC分类号： G11B7/1362 ,  G11B7/1356 ,  G11B7/1365

    摘要： Provided is an optical disc apparatus including an interference-type optical disk signal detection system, which allows an optical path difference between two kinds of light to be controlled easily, which has a high signal amplification effect, and which is suitable for miniaturization of an optical system. An interference-type optical system is integrally formed to stabilize an optical path difference between signal light and reference light. At the same time, means for controlling an optical path length of the reference light is attached to a reference mirror (114), and thereby controls signal amplitude so as to be constantly set the maximum in response to a change in the optical path length with time due to a variation in the thickness of a cover layer of an optical disk, a temperature and the like. Moreover, the optical system is miniaturized by using a Twyman-Green type interference optical system.