During the design process of Blu-ray disc optical pick-up, the optical system and the collimator lens design is especially important.
在蓝光光盘光学头设计过程中，光学系统的设计，有举足轻重的作用，特别是准直镜的设计。
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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.
With a collimator and a 23 polyhedron as measuring datum, a set of optical angular encoder measuring data, which containing the eccentricity error, was obtained.