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    • 8. 发明授权
    • Optical pickup apparatus, optical recording medium driving apparatus, and signal recording/reproducing method
    • 光拾取装置,光记录介质驱动装置和信号记录/再现方法
    • US08059504B2
    • 2011-11-15
    • US12192605
    • 2008-08-15
    • Taku TsuboiEiichi Ueda
    • Taku TsuboiEiichi Ueda
    • G11B5/09
    • G11B7/1381G11B7/0903G11B2007/0013
    • An optical pickup apparatus capable of irradiating an optical recording medium having a plurality of recording layers on which a signal is recorded with laser light includes a light source emitting the laser light, a light-concentrating element concentrating the laser light emitted from the light source on the optical recording medium, a phase difference element having a region divided into at least two regions which the laser light reflected by the optical recording medium enters and producing a phase difference between first light and second light reflected by a non-target layer which is not a target of recording or reproduction of the signal out of the plurality of recording layers and entering the at least two regions such that the first and the second light weaken each other, and a photodetector receiving the laser light emitted from the phase difference element.
    • 能够对具有多个激光记录信号的记录层的光记录介质进行照射的光拾取装置包括发射激光的光源,将从光源射出的激光聚光的光聚集元件 光记录介质,具有被分成至少两个区域的区域的相位差元件,由光记录介质反射的激光入射并产生由不是非目标层反射的第一光和第二光之间的相位差 记录或再现多个记录层中的信号并进入至少两个区域的目标,使得第一和第二光弱化,以及接收从相位差元件发射的激光的光电检测器。