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    • 18. 发明授权
    • Optical disk drive equipped with waveform equalizer and focus adjustment
circuit
    • 光盘驱动器配有波形均衡器和对焦调整电路
    • US5848036A
    • 1998-12-08
    • US876478
    • 1997-06-16
    • Hiromichi IshibashiRyusuke HoribeToshiyuki Shimada
    • Hiromichi IshibashiRyusuke HoribeToshiyuki Shimada
    • G11B7/005G11B7/09
    • G11B7/0948G11B7/0945G11B7/005G11B7/0908
    • An optical disk drive for reading information recorded on a recording surface of an optical disk medium using an optical head to generate a read-out signal, comprises focus position control means for controlling a focal point of a light beam emitted from the optical head so that it is positioned on a focus position that is set as a position in the vicinity of the recording surface of the optical disk medium; equalizing means for performing waveform equalization using a set equalization quantity, to the read-out signal generated by the optical head, and outputting an equalization signal; jitter measuring means for measuring a jitter of the equalization signal output from the equalizing means; and optimum value searching means for searching for a focus position and an equalization quantity, at which the jitter is minimized. In this optical disk drive, for both the focus position and the equalization quantity, the jitter minimized point can be searched accurately.
    • 一种光盘驱动器,用于使用光头读取记录在光盘介质的记录表面上的信息以产生读出信号,包括焦点位置控制装置,用于控制从光学头发射的光束的焦点,使得 它位于被设置为在光盘介质的记录表面附近的位置的聚焦位置; 均衡装置,用于使用设定的均衡量进行波形均衡,由光头产生的读出信号,并输出均衡信号; 抖动测量装置,用于测量从均衡装置输出的均衡信号的抖动; 以及用于搜索抖动被最小化的聚焦位置和均衡量的最优值搜索装置。 在该光盘驱动器中,对于焦点位置和均衡量两者,可以精确地搜索抖动最小化点。