公开(公告)号：US06741416B2

公开(公告)日：2004-05-25

申请号：US09736798

申请日：2000-12-14

申请人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hajime Hatada ,  Ikuo Ohmura

发明人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hajime Hatada ,  Ikuo Ohmura

IPC分类号： G11B5596

CPC分类号： G11B5/5526 ,  G11B5/59677

摘要： A device and a method are provided in which stable tracking control can be carried out even in an arbitrary phase by optically reading pits provided in a disk when information is recorded on and reproduced from the disk with a magnetic head. With respect to difference signals obtained from a main beam signal and sub-beam signals obtained through three-beam type photodetectors, gain correction is executed in variable gain amplifiers, respectively, so that output signals therefrom have same amplitude levels and are different in phase by 90 degrees in a track crossing direction, and thus a tracking error signal is generated by being synthesized from the output signals. Based on the tracking error signal, tracking control is carried out.

摘要翻译： 提供了一种装置和方法，其中即使在磁盘上记录信息并从磁盘再现的情况下，即使在任意阶段也可以通过光学读取设置在盘中的凹坑来进行稳定的跟踪控制。 对于从主波束信号和通过三光束型光电检测器获得的子波束信号获得的差分信号，分别在可变增益放大器中执行增益校正，使得其输出信号具有相同的幅度电平并且在相位上不同 通过从输出信号合成，产生轨迹交叉方向90度的跟踪误差信号。 基于跟踪误差信号，进行跟踪控制。