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    • 1. 发明申请
    • Apparatus and method for controlling tracking servo in near field optics
    • 用于控制近场光学中的跟踪伺服的装置和方法
    • US20060133231A1
    • 2006-06-22
    • US11285208
    • 2005-11-23
    • Jeong SeoYun ShinJin Kim
    • Jeong SeoYun ShinJin Kim
    • G11B7/00
    • G11B7/0903
    • Disclosed are an apparatus and a method for controlling a tracking servo in a near field optics. Gap error signals are detected in a divided state, and a push pull signal is compensated based on the detected gap error signals. A photo detector detecting the gap error signals is divided into two areas such that movement of an image formed on the photo detector can be detected. The push pull signal is compensated by subtracting a value proportional to a difference value between the two gap error signals detected in the photo detector. The difference value between the two gap error signals is proportional to a dc offset component included in the push pull signal. Accordingly, it is possible to simply remove a dc offset included in a push pull signal without largely modifying the near field optics, so that it is possible to exactly perform a tracking servo operation.
    • 公开了一种用于控制近场光学器件中的跟踪伺服的装置和方法。 在分割状态下检测间隙误差信号,并且基于检测到的间隙误差信号来补偿推挽信号。 检测间隙误差信号的光电检测器被分成两个区域,使得可以检测在光电检测器上形成的图像的移动。 通过减去与光检测器中检测到的两个间隙误差信号之间的差值成比例的值来补偿推挽信号。 两个间隙误差信号之间的差值与包括在推挽信号中的直流偏移分量成比例。 因此,可以简单地去除包括在推挽信号中的直流偏移,而不会大幅度地修改近场光学元件,使得可以精确地执行跟踪伺服操作。