物镜，光学拾取器，记录器和重现设备。
Objective lens, optical pickup device, recorder and reproducer.
本发明提供适用于光学拾取器单元的液晶聚酯树脂组合物。
The composition comprises a liquid crystalline polyester, a mica and a hollow filler.
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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