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1. 发明授权

US5231619A Optical disk apparatus having improved tracking servo mechanism 失效
标题翻译：具有改进的跟踪伺服机构的光盘装置
公开(公告)号：US5231619A
公开(公告)日：1993-07-27
申请号：US618673
申请日：1990-11-27
申请人： Yoshiyuki Ohtsuka
发明人： Yoshiyuki Ohtsuka
IPC分类号： G11B7/085 , G11B7/095
CPC分类号： G11B7/0953 , G11B7/08517
摘要： An optical disk apparatus has a tracking servomechanism in which the servotiming is determined by the length of the period of the tracking error signal detected on an optical disk. Because of the eccentricity of the optical disk, the period of the tracking error signal cannot be constant. If the servo loop is closed during a time interval in which the period of the tracking error signal is relatively short, it takes much time to make an optical head follow a predetermined track because the optical head crosses another track before the optical head can be made to follow the predetermined track so that feedback servocontrol must be repeated until the optical head is made to follow the predetermined track. In view of this, in the tracking servomechanism of the optical disk apparatus according to the present invention, the servo loop is closed only when the period of the tracking error signal is so long that only one performance of the feedback servocontrol can make the optical head follow the predetermined track. Consequently, the optical head can be servoed in a relatively short time.
摘要翻译：光盘装置具有跟踪伺服机构，其中伺服定位由在光盘上检测到的跟踪误差信号的周期的长度确定。由于光盘的偏心度，跟踪误差信号的周期不能保持恒定。如果在跟踪误差信号的周期相对较短的时间间隔期间伺服环路关闭，则由于光头在制造光头之前会使光头穿过另一条轨道，所以使光头跟随预定的轨迹需要很多时间以遵循预定的轨道，使得必须重复反馈伺服控制，直到光学头被制成遵循预定的轨道。鉴于此，在根据本发明的光盘装置的跟踪伺服机构中，只有当跟踪误差信号的周期如此长时，伺服环才闭合，使得只有一个性能的反馈伺服控制可以使光头遵循预定的轨道。因此，可以在较短的时间内对光头进行伺服。

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