公开(公告)号：US20050024998A1

公开(公告)日：2005-02-03

申请号：US10900337

申请日：2004-07-28

申请人： Yukio Inoue ,  Kazuyuki Yamaguchi ,  Taizou Kusano ,  Kazuhisa Hayashida ,  Yuichi Udo ,  Yuko Fujimoto ,  Hiromi Kuriyama ,  Takashi Ooishi ,  Yasuhiro Kaneo ,  Ryo Ando

发明人： Yukio Inoue ,  Kazuyuki Yamaguchi ,  Taizou Kusano ,  Kazuhisa Hayashida ,  Yuichi Udo ,  Yuko Fujimoto ,  Hiromi Kuriyama ,  Takashi Ooishi ,  Yasuhiro Kaneo ,  Ryo Ando

IPC分类号： G11B7/00 ,  G11B7/09 ,  G11B20/18 ,  G11B21/03

CPC分类号： G11B7/0948 ,  G11B20/18 ,  G11B20/1816

摘要： A servo error signal and a defect detection signal are generated from an output signal of the pickup unit, and a servo control signal and a hold signal are generated from the servo error signal. When changing to either a servo control signal or a hold signal based on the defect detection signal generated in a defect detection signal generation circuit which has a peak hold circuit having different tracking ability, so as to perform servo control of the pickup unit, a servo error signal predetermined time before a timing to change from the servo control signal to the hold signal is used as the servo error signal used for generation of the hold signal.

摘要翻译： 从拾取单元的输出信号产生伺服误差信号和缺陷检测信号，并且从伺服误差信号产生伺服控制信号和保持信号。 基于在具有不同跟踪能力的峰值保持电路的缺陷检测信号发生电路中产生的缺陷检测信号，当改变为伺服控制信号或保持信号时，为了执行拾取单元的伺服控制，伺服 将从伺服控制信号改变为保持信号的定时之前的预定时间的误差信号用作用于产生保持信号的伺服误差信号。