研究光学拾取头的基本原理和光盘信号拾取原理，简要分析了实际的光学头聚焦伺服和循迹伺服的机械结构。

Studying the theory of optical pickup head unit (OPU) and how to pickup the signal on the disk. Based on these theories, it analyse the structure of the focusing and tracking device.

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修正信号的输出可以用于驱动一个简单的自动聚焦伺服器。

The output of this correction signal can be used to drive a simple auto-focus servo.

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