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    • 5. 发明专利
    • Aberration detection device and optical pickup device
    • 空值
    • JP3827940B2
    • 2006-09-27
    • JP2000348679
    • 2000-11-15
    • シャープ株式会社
    • 郁雄 中野宏之 多田野
    • G02B5/32G11B7/135G02B7/28G02B13/00G11B7/00G11B7/09G11B7/13
    • G11B7/131G11B7/0912G11B7/0916G11B7/0943G11B7/0948G11B7/1353G11B7/1374G11B7/13927G11B2007/0013G11B2007/13727
    • An aberration detection device which can detect a spherical aberration sensitively by separating a light beam appropriately so as to enlarge a difference in the positions where the respective separated light beams have the minimum spot diameters, and thus to enlarge a deviation amount of the focus positions of the separated light beams, is provided. A hologram for separating a light beam reflected from an optical disk and passing through a dual element objective lens into a first light beam and a second light beam, and a detection device for receiving the first and the second light beams and detecting the deviation of focus positions of the first and the second light beams, are equipped. The light beam directed to the hologram is separated into the first light beam and the second light beam, by a first region and a second region of the hologram which are obtained by being separated at a boundary drawn at an extreme value of a curve representing a wave front when the light beam has a minimum beam diameter on an information recording layer of the optical disk.
    • 一种像差检测装置,其能够通过适当地分离光束来敏感地检测球面像差,以扩大各分离光束具有最小光斑直径的位置的差异,从而扩大焦点位置的偏移量 提供分离的光束。 一种用于将从光盘反射并通过双元件物镜的光束分离为第一光束和第二光束的全息图,以及用于接收第一和第二光束并检测聚焦偏差的检测装置 配备第一和第二光束的位置。 被引导到全息图的光束被分离成第一光束和第二光束,由第一区域和全息图的第二区域分离,所述第一区域和第二区域通过在表示a的曲线的极值绘制的边界处被分离 当光束在光盘的信息记录层上具有最小光束直径时,该光束前方。