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    Optical pickup
    6.
    发明公开
    Optical pickup 有权
    Optischer Abtaster

    公开(公告)号：EP2058808A1

    公开(公告)日：2009-05-13

    申请号：EP08019369.1

    申请日：2008-11-05

    申请人： Funai Electric Co., Ltd.

    发明人： Sogawa, Teruaki ,  Takahashi, Masanori

    IPC分类号： G11B7/125 ,  G11B7/13

    CPC分类号： G11B7/127 ,  G11B7/1263 ,  G11B7/13

    摘要： An optical pickup includes a semiconductor laser (201), a beam splitter (203), a collimating lens (206), an objective lens (207), an aperture (210) and a front monitor (205). The beam splitter splits a light beam emitted by the semiconductor laser into transmitted light and reflected light. The front monitor detects luminous energy of the transmitted light. The front monitor is disposed near an optical axis of the transmitted light so that the following is satisfied: 1 ≤ (S x L) / (s x f) ≤ 6.8. S is an area of an entrance pupil of the objective lens, f is an optical distance from an emission portion of the semiconductor laser to the collimating lens, s is an effective receiving area of the front monitor, and L is an optical distance from the emission portion of the semiconductor laser to the front monitor.

    摘要翻译： 光拾取器包括半导体激光器（201），分束器（203），准直透镜（206），物镜（207），孔（210）和前监视器（205）。 分束器将由半导体激光器发射的光束分成透射光和反射光。 前置显示器检测透射光的光能。 前端监视器靠近发射光的光轴，以满足以下要求：1‰¤（S×L）/（s x f）‰6.8。 S是物镜的入射光瞳的面积，f是从半导体激光器的发射部分到准直透镜的光学距离，s是前监视器的有效接收面积，L是距离 半导体激光器的发射部分到前监视器。

    OPTICAL HEAD AND DEVICE AND SYSTEM PROVIDED WITH THIS
    9.
    发明公开
    OPTICAL HEAD AND DEVICE AND SYSTEM PROVIDED WITH THIS 审中-公开
    光头以及设备和系统，

    公开(公告)号：EP1630798A4

    公开(公告)日：2008-09-24

    申请号：EP04705498

    申请日：2004-01-27

    申请人： MATSUSHITA ELECTRIC IND CO LTD

    发明人： SANO KOUSEI ,  KOMMA YOSHIAKI ,  TANAKA TOSHIYASU

    IPC分类号： G11B7/09 ,  G11B7/00 ,  G11B7/13 ,  G11B7/135 ,  G11B7/24

    CPC分类号： G11B7/1381 ,  G11B7/131 ,  G11B7/1353 ,  G11B2007/0006 ,  G11B2007/0013

    摘要： A detection area is provided for detecting a light reflected off a first or second information recording medium and passed through an optical element, the first and second information recording medium are multiplayer disks each of at least two layers, the detection area contains a detection area (41) for detecting the first-order or higher diffraction light of a first-wavelength light and a detection area (42) for detecting the first-order or higher diffraction light of a second-wavelength light, the detection area (41) is disposed so as not cross over an area defined by the maximum range (38) of the zero-order light spreading of a light from a recording layer different from a recording layer subjected to recording or reproducing out of lights from the first information recording medium, and the detection area (42) is disposed so as not cross over an area defined by the maximum range (39) of the zero-order light spreading of a light from a recording layer different from a recording layer subjected to recording or reproducing out of lights from the second information recording medium.