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1·In this OPU, we use a triplet lens to collimate the laser beam.

在该系统中，我们采用三片式准直镜来对光束进行准直。

2·Select high-quality metallurgical powder forging, opu 18%, lubricity and wearability ideal combination.

精选高品质的粉末冶金锻造，含油率为18%，润滑性与耐磨性理想结合。

3·This paper designs an optical system and some lenses for the BD OPU, including collimator lens, beam shaping lens for laser beam shaping, and cylinder lens for signal detecting.

本文设计了一套蓝光光学读取头的光路系统，包括用于光束处理的准直镜，整形棱镜，还有用于信号探测的柱面镜。

4·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.

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。