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    • 15. 发明授权
    • Optical pickup apparatus
    • 光拾取装置
    • US07020055B2
    • 2006-03-28
    • US10233569
    • 2002-09-04
    • Jong-bae KimYoung-man AhnTatsuhiro Otsuka
    • Jong-bae KimYoung-man AhnTatsuhiro Otsuka
    • G11B7/00
    • G11B7/13927G11B7/131G11B7/1353G11B7/1369
    • An optical pickup apparatus includes a detection unit detecting a light beam reflected/diffracted by the recording medium and passing through the objective lens by dividing the light beam into a plurality of light areas, and a signal processor detecting a difference between widths T1 and T2 indicating that first and second focusing signals are greater than a predetermined threshold value and a thickness signal of the recording medium by using the detected difference when an S-curve of a focus error signal detected by using detection signals of the light areas output from the detection unit is obtained by subtracting a second detecting signal from a first detecting signal or by subtracting the first focusing signal from the second signal. Thus, a spherical aberration due to a change in thickness of the recording medium can be corrected by driving a spherical aberration correcting device according to a thickness signal corresponding to the change in thickness of the recording medium.
    • 一种光学拾取装置,包括:检测单元,检测由记录介质反射/衍射的光束,并通过将光束分割成多个光区域而通过物镜;以及信号处理器,检测宽度T 1和T之间的差 2,当通过使用从所述第一和第二聚焦信号输出的光区域的检测信号检测到的聚焦误差信号的S曲线时,通过使用检测到的差异,指示第一和第二聚焦信号大于预定阈值和记录介质的厚度信号 通过从第一检测信号中减去第二检测信号或从第二信号中减去第一聚焦信号获得检测单元。 因此,可以通过根据与记录介质的厚度变化相对应的厚度信号驱动球面像差校正装置来校正由于记录介质的厚度变化引起的球面像差。