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    Optical miniaturized module, optical pickup device, and optical disk device provided with light source and photodetector
    31.
    发明授权
    Optical miniaturized module, optical pickup device, and optical disk device provided with light source and photodetector 失效
    光学小型化模块，光学拾取装置以及具有光源和光电检测器的光盘装置

    公开(公告)号：US07369479B2

    公开(公告)日：2008-05-06

    申请号：US11029599

    申请日：2005-01-04

    申请人： Masaru Ogawa ,  Tetsuo Ueyama ,  Kohji Minami ,  Tomoyuki Miyake ,  Tomiyuki Numata

    发明人： Masaru Ogawa ,  Tetsuo Ueyama ,  Kohji Minami ,  Tomoyuki Miyake ,  Tomiyuki Numata

    IPC分类号： G11B7/00

    CPC分类号： G11B7/131 ,  G11B7/0901 ,  G11B7/123 ,  G11B7/1353 ,  G11B7/1381

    摘要： The optical miniaturized module includes a semiconductor laser for irradiating an optical disk with laser light, a diffraction grating for forming a main beam and two sub beams from the laser light, a polarization hologram for dividing reflected light from the optical disk, and a photodetector for detecting the reflected light. The polarization hologram includes a first parting line defined in a direction optically corresponding to a radial direction as the optical disk rotates. A main beam M incident area is divided with a boundary defined by the first parting line. A sub beam A incident area and a sub beam B incident area are each arranged avoiding the first parting line.

    摘要翻译： 该光学小型化模块包括用于用激光照射光盘的半导体激光器，用于形成主光束的衍射光栅和来自激光的两个子光束，用于分离来自光盘的反射光的偏振全息图，以及用于 检测反射光。 偏振全息图包括在光盘旋转时沿与光学对应的方向限定的第一分型线。 主波束M入射区域由第一分隔线限定的边界划分。 分别设置子光束A入射区域和副光束B入射区域，避开第一分色线。

    Diffraction grating having multiple gratings with different cycles for generating multiple beams and optical pickup using such diffraction grating
    32.
    发明授权
    Diffraction grating having multiple gratings with different cycles for generating multiple beams and optical pickup using such diffraction grating 有权
    衍射光栅具有用于产生多个光束的不同周期的多个光栅和使用这种衍射光栅的光学拾取器

    公开(公告)号：US06487015B2

    公开(公告)日：2002-11-26

    申请号：US09407088

    申请日：1999-09-28

    申请人： Kazuya Kitamura ,  Yukio Kurata ,  Takeshi Yamaguchi ,  Tetsuo Ueyama

    发明人： Kazuya Kitamura ,  Yukio Kurata ,  Takeshi Yamaguchi ,  Tetsuo Ueyama

    IPC分类号： G02B2764

    CPC分类号： G11B7/1353 ,  G02B5/1819 ,  G11B7/14

    摘要： A diffraction grating for generating a plurality of beams includes a plurality of gratings. The plurality of gratings are formed to have an axis of symmetry perpendicular to the direction in which a beam is divided on a surface of diffraction grating and include at least two gratings having different fundamental cycles. The plurality of gratings are formed such that they have an axis of symmetry perpendicular to the direction in which a beam is divided on a surface of the diffraction grating, for generating a plurality of beams. The fundamental cycle increases as a function of the distance from the axis of symmetry, and therefore aberration in the periphery of scattering light may be reduced.

    摘要翻译： 用于产生多个光束的衍射光栅包括多个光栅。 多个光栅形成为具有垂直于衍射光栅表面上的光束分割方向的对称轴线，并且包括具有不同基本周期的至少两个光栅。 多个光栅被形成为使得它们具有垂直于在衍射光栅的表面上划分光束的方向的对称轴线，用于产生多个光束。 基本周期作为距对称轴的距离的函数增加，因此散射光的周边的像差可能会降低。