摘要
本文基于衍射理论,采用更接近光盘实际情况的椭圆形信息坑点的沟槽型蓝光盘片模型,计算了聚焦光斑在光盘表面扫描过程中的出瞳光强分布,得到位相移动DPP循迹误差信号。并在此基础上对比分析了传统方形坑点模型与椭圆形坑点模型的盘片的径向倾斜角度对循迹误差信号的影响。结果表明,在更高存储密度的超高密度光盘系统中,容量达到50GB的盘片对径向倾斜的敏感度很高,为保证盘片的正常读取,需对该系统进行倾斜伺服使倾斜角度不超过0.15o。
Based on diffraction theory and groove and land model with elliptical pits blue-ray disc,the energy distribution on exit pupil was investigated and tracking error signal was obtained by Differential Push Pull（DPP） method when focus spot scanning through the blue-ray disc.Furthermore,the influence of traditional square pits and elliptical pits disc radial tilt on tracking error signal was compared.Result shows that ultra-high density disc for 50 GB blue-ray disc is very sensitive to radial tilt.In order to make sure that the disk is read correctly,the allowable radial tilt angle should be less than 0.15o.
出处
《光电工程》
CAS
CSCD
北大核心
2011年第4期25-30,共6页
Opto-Electronic Engineering
