一种以两倍速刻录双层BD的兼容光学头

一、前言蓝光光盘(BD:Blu-ray Disc)刻录机于2004年实现商品化,其使用的光学头体积大于当前的DVD光学头,并且不能用于刻录DVD或CD。导致BD光学头体积大的原因之一,是该光学头含有一个整形棱镜,该整形棱镜由分离的准直镜和探测物镜组成。虽然目前正在改进蓝光激光二极管(LDs:Laser Diodes)以提高其输出功率,但还没有完全成功。为了实现以两倍速(2X)刻录双层BD盘片,激光的使用效率必须足够高,而光束整形是提高激光使用效率的必要环节。

An ordinary half-height size optical pickup with high light-use efficiency for Blu-ray Discs(BDs)has been realized.It has two objective lenses arranged tangentially.Although one of the objective lenses,BD objective lens,does not follow the line that passes through the center of the spindle motor,stable trackingerror detection has been achieved by enhancing a one-beam method.This pickup has a beam shaper which changes a divergent angle of light with high magnification.Although beam shapers are sensitive to a positional error,our pickup accomplished stable positioning by introducing a new structure.