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    • 6. 发明授权
    • Optical disc drive and optical disc controller
    • 光盘驱动器和光盘控制器
    • US06925037B2
    • 2005-08-02
    • US10386612
    • 2003-03-12
    • Takashi KishimotoTakeharu YamamotoYoshihiro KandaJun Kikuchi
    • Takashi KishimotoTakeharu YamamotoYoshihiro KandaJun Kikuchi
    • G11B7/085G11B7/00
    • G11B7/08529G11B7/08541
    • An optical disc drive includes: an optical head with an actuator and a photodetector; a tracking driver outputting a drive signal to the actuator; a first tracking error signal generator for generating a first tracking error signal based on an output signal of the photodetector; first and second lens position control sections for respectively outputting first and second lens position control signals to the tracking driver; and a selector for selectively supplying the first tracking error signal to the first or second lens position control section according to a moving velocity of the optical head during a seek operation. The first lens position control signal is obtained by extracting signal components, of which the frequencies are equal to or lower than a predetermined frequency, from the first tracking error signal. The second lens position control signal is obtained by extracting DC components of the first tracking error signal at on-track points thereof.
    • 光盘驱动器包括:具有致动器和光电检测器的光学头; 向所述致动器输出驱动信号的跟踪驱动器; 第一跟踪误差信号发生器,用于基于光电检测器的输出信号产生第一跟踪误差信号; 第一和第二透镜位置控制部分,用于分别向跟踪驱动器输出第一和第二透镜位置控制信号; 以及选择器,用于根据拾取操作期间光头的移动速度,选择性地将第一跟踪误差信号提供给第一或第二透镜位置控制部。 通过从第一跟踪误差信号中提取频率等于或低于预定频率的信号分量来获得第一透镜位置控制信号。 第二透镜位置控制信号通过在其轨迹点上提取第一跟踪误差信号的DC分量来获得。