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。

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Firstly, a telescope system is made up with a concave lens and a long-focus convex lens, by which the angle of the parallel beam from the collimator can be change.

该方法借助一个焦距较长的凸透镜与被测凹透镜组成无焦系统，可以使准直管出射光束的张角发生改变；

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This sensor featuring plane-convex lens collimator for expanding beam and coupling, and a low frequency for light pulse modulation is introduced.

利用平-凸透镜准直器作扩束耦合光学系统，采用低频斩光器实现光调制。

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