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    • 36. 发明授权
    • Optical pickup apparatus and optical recording medium drive employing
the same
    • 光拾取装置和采用该拾取装置的光记录介质驱动装置
    • US6144623A
    • 2000-11-07
    • US14980
    • 1998-01-28
    • Yasuaki InoueTakenori GotoAtsushi TajiriKazushi MoriMinoru SawadaAkira IbarakiMasayuki Shono
    • Yasuaki InoueTakenori GotoAtsushi TajiriKazushi MoriMinoru SawadaAkira IbarakiMasayuki Shono
    • G11B7/09G11B7/12G11B7/13G11B7/135G11B7/00
    • G11B7/1353G11B7/123G11B7/131G11B7/0912
    • A transmission-type holographic optical element has a four-segment holographic surface divided into four regions of equal areas by virtual dividing lines which are perpendicular to each other. The first dividing line is at an angle with respect to the track direction of an optical disk and the second dividing line is at an angle with respect to the radial direction of the optical disk before tracking phase adjustment. The first dividing line coincides with the track direction of the optical disk and the second dividing line coincides with the radial direction of the optical disk after tracking phase adjustment. A four-segment photodetection part is divided into four photodetection parts of equal areas by a dividing line substantially parallel to the radial direction of the optical disk and a dividing line perpendicular thereto. Parts of a main beam diffracted in two regions located on first diagonal positions of the four-segment holographic surface are condensed as condensed spots on adjacent positions of the first dividing line of the four-segment photodetection part on opposite sides, and parts of the main beam diffracted in the remaining two regions located on second diagonal positions are condensed as condensed spots on separate positions of the second dividing line of the four-segment photodetection part on opposite sides.
    • 透射型全息光学元件具有通过彼此垂直的虚拟分割线被划分为相等面积的四个区域的四段全息表面。 第一分割线相对于光盘的轨道方向成一定角度,并且第二分割线在跟踪相位调整之前相对于光盘的径向方向成一定角度。 第一分割线与光盘的轨道方向一致,并且第二分割线在跟踪相位调整之后与光盘的径向一致。 四段光电检测部分通过基本上平行于光盘的径向的分割线和与其垂直的划分线分成四个具有相等面积的光电检测部分。 在四段全息表面的第一对角位置上的两个区域中衍射的主光束的部分在相对侧的四段光检测部分的第一分割线的相邻位置上被聚集为聚集点,主要部分 在位于第二对角位置的剩余两个区域中衍射的光束在相对侧的四段光检测部分的第二分割线的分离位置上被冷凝为聚光点。