If the objective lens is closer to the compact disk than the focal length of the object lens then the cylindricallens creates an elliptical image on the photodetector array.
如果物镜与光盘之间的距离短于物镜的焦距，柱面透镜就会使在光电探测器阵列上的成像变成椭圆影像。
2
If the objective lens is closer to the compact disk than the focal length of the object lens, then the cylindricallens creates an elliptical image on the photodetector array.
如果物镜与光盘之间的距离短于物镜的焦距，柱面透镜就会使在光电探测器阵列上的成像变成椭圆影像。
3
If the objective lens is further away from the compact disk than the focal length of the object lens then the cylindricallens again creates an elliptical image on the photodetector array.