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    Optical head apparatus and optical information recording or reproducing apparatus
    5.
    发明公开
    Optical head apparatus and optical information recording or reproducing apparatus 审中-公开
    光学读取头和装置用于光学地记录和再现信息

    公开(公告)号：EP1524654A2

    公开(公告)日：2005-04-20

    申请号：EP04024416.2

    申请日：2004-10-13

    申请人： NEC CORPORATION

    发明人： Katayama, Ryuichi

    IPC分类号： G11B7/125 ,  G11B7/135

    CPC分类号： G11B7/1369 ,  G11B7/1356 ,  G11B7/1378 ,  G11B7/139 ,  G11B7/13925 ,  G11B7/1395 ,  G11B2007/0006

    摘要： There is disclosed an optical head apparatus and an optical information recording or reproducing apparatus capable of obtaining a high light output at a recording time, and a high S/N at a reproducing time with respect to any of disks of next-generation, DVD, and CD standards. Light having a wavelength of 400 nm emitted from a semiconductor laser (1c) is almost all reflected by a beam splitter (51d), and condensed on a disk (204) of the next-generation standard. Light having a wavelength of 660 nm emitted from a semiconductor laser (1b) is almost all reflected by a beam splitter (51a), almost all transmitted through the beam splitter (51b), and condensed on the disk of the DVD standard. Light having a wavelength of 780 nm emitted from a semiconductor laser (1a) is almost all transmitted through a beam splitter (51c), almost all reflected by the beam splitters (51b,51a) and condensed on the disk of the CD standard. Reflected light from the disk is almost all transmitted through the beam splitters and received by a photodetector.

    摘要翻译： 有在光学头装置和光学信息记录或再现设备，其能够获取在记录时间的高的光输出的游离缺失盘，和高的S / N在再现时间相对于任何下一代DVD的盘， 和CD的标准。 具有从半导体激光器（1c）中所发射的400nm的波长的光几乎全部被分束器（51D）反射，会聚的下一代标准的盘（204）上。 具有从半导体激光器（1b）中所发射的660nm的几乎全部由一个光束分离器（51A）所反射的波长的光，几乎所有反式通过分束器（51B）mitted，并且冷凝的DVD标准的光盘上。 具有从半导体激光器（1a）的所发射的780nm的波长的光几乎是全反式通过一个分束器（51C）mitted，几乎所有的由所述分束器（51B，51A）反射并会聚在CD标准的磁盘上。 从盘反射的光几乎是全反式通过分束器mitted并由光探测器接收。

    Optical head apparatus for different types of disks
    7.
    发明公开
    Optical head apparatus for different types of disks 失效
    Optische Wiedergabekopfvorrichtungfürverschiedene Plattentypen

    公开(公告)号：EP0747893A2

    公开(公告)日：1996-12-11

    申请号：EP96109087.5

    申请日：1996-06-05

    申请人： NEC CORPORATION

    发明人： Katayama, Ryuichi

    IPC分类号： G11B7/12 ,  G11B7/135

    CPC分类号： G11B7/1367 ,  G02B5/1876 ,  G02B5/188 ,  G11B7/0037 ,  G11B7/0903 ,  G11B7/0908 ,  G11B7/0912 ,  G11B7/123 ,  G11B7/127 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/139 ,  G11B7/13922 ,  G11B11/10543 ,  G11B11/10576 ,  G11B2007/0006 ,  G11B2007/13727

    摘要： In an optical head apparatus for two or more different types of discs (A, A', B), there are provided a first light source (11) for a first wavelength light beam, a second light source (12) for a second wavelength light beam, and an objective lens (6, 6', 6'') for leading the first and second wavelength light beams to one of the discs. A holographic optical element (5', 5'') is provided to converge or diverge only one of the first and second wavelength light beams. Or, an aperture limiting element (2801) is provided to adjust an effective numerical aperture of the objective lens for only one of the first and second wavelength light beams.

    摘要翻译： 在用于两种或更多种不同类型的光盘（A，A'，B）的光学头装置中，设置有用于第一波长光束的第一光源（11），用于第二波长的第二光源（12） 光束和用于将第一和第二波长光束引导到其中一个盘的物镜（6,6'，6“）。 提供全息光学元件（5'，5“）以会聚或发散第一和第二波长光束中的仅一个。 或者，提供孔径限制元件（2801）以仅调整第一和第二波长光束中的一个的物镜的有效数值孔径。

    Optical head and optical information recording/reproducing device
    8.
    发明公开
    Optical head and optical information recording/reproducing device 有权
    用于再现信息的光学头和记录装置

    公开(公告)号：EP1109162A3

    公开(公告)日：2002-09-18

    申请号：EP00127551.0

    申请日：2000-12-15

    申请人： NEC CORPORATION

    发明人： Katayama, Ryuichi

    IPC分类号： G11B7/095

    CPC分类号： G11B7/0956

    摘要： Disclosed is a method and apparatus for generating a test sequence to test a fault in a digital circuit. According to this method and apparatus, when a fault propagation process for a fault, for which a test sequence is generated is not successful, at least a segment of a path to propagate the effects of the fault is memorized as illegal information. And the fault propagation process is restarted for the same fault without selecting the illegal information. Hence, the chance of a successful fault propagation process is increased, which leads to the improvement of the fault coverage. In addition, according to the apparatus and method, it is detected whether a state transition goes into a loop (i.e., two identical states exist) in the state initialization process and then the process is restarted by defining the state caused the loop as an illegal state. Hence, the chance of a successful state initialization process is increased, which leads to the improvement of the fault coverage.