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公开(公告)号：US4899327A
公开(公告)日：1990-02-06
申请号：US52115
申请日：1987-05-04
CPC分类号： G11B7/125 , G11B7/094 , G11B7/0945 , G11B7/0909
摘要： Error correction in a feedback servo system. The feedback servo loop in, for example, a head positioning circuit in an optical disk data recording and retrieval system is provided with means for forcing the feedback signal to zero when the head is positioned at best focus as determined by a peak in the laser monitoring diode. The head in such a system must be dynamically maintained at a best focus position but, through use and transporting, the alignment of the head position error detecting system can be disturbed. In some cases, the loop circuit parameters may drift from their original values. To correct for errors introduced from such causes, the head is positioned at best focus and the focus error (head position error) signal is sensed. A correction system forces the sensed value to zero, e.g, by adjusting the gain of amplifiers used in the feedback loop.
摘要翻译： 反馈伺服系统中的误差校正。 例如，在光盘数据记录和检索系统中的例如头部定位电路中的反馈伺服环路设置有当头部位于最佳焦点时强制反馈信号为零的装置，由激光监测中的峰值确定 二极管。 这种系统中的头部必须被动态地保持在最佳对焦位置，但是通过使用和传送，头部位置误差检测系统的对准可能受到干扰。 在某些情况下，环路电路参数可能偏离其原始值。 为了纠正从这些原因引起的错误，头部被定位在最佳焦点处，并且感测到聚焦误差（头位置误差）信号。 校正系统将感测值强制为零，例如通过调整在反馈回路中使用的放大器的增益。
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公开(公告)号：US5367513A
公开(公告)日：1994-11-22
申请号：US148695
申请日：1993-11-05
申请人： Keith A. Bates , Nhan X. Bui , Delbert A. Hansen
发明人： Keith A. Bates , Nhan X. Bui , Delbert A. Hansen
CPC分类号： G11B7/0946 , G11B7/094
摘要： A circuit for electronically compensating for optical and mechanical instabilities induced into the focus control and tracking control servo circuits of an optical disk apparatus. The circuit contains a filter and a variable gain amplifier for passing a tracking error signal compensation component at a selected frequency within the range of frequencies in which mechanical resonance is significant and at a magnitude equal to the focus error signal component at that frequency. The result is the electronic elimination of optical feedthrough at mechanically resonating frequencies. A calibration circuit establishes the compensation component magnitude for each optical disk inserted into the apparatus.
摘要翻译： 一种电子补偿光学和机械不稳定性的电路，该光学和机械不稳定性被引入到光盘装置的聚焦控制和跟踪控制伺服电路中。 该电路包含一个滤波器和一个可变增益放大器，用于将机械共振的频率范围内的选定频率的跟踪误差信号补偿分量传递到与该频率处的聚焦误差信号分量相等的幅度。 结果是在机械谐振频率下电子消除光学馈通。 校准电路为插入设备中的每个光盘建立补偿分量幅度。
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