The results show that the annular beams become non-rotational symmetric after passing through an astigmatic lens.
研究结果表明：环状光束通过像散透镜后变为非旋转对称光束；
2
In a non-rotational symmetry drawing, material of flange on blank holder face is the main body of deformations, and has direct effects on the formability of drawing.
非回转对称拉深成形过程中 ，压料面上法兰材料是变形的主体 ，直接影响到拉深成形性。
3
Non spherical surface lens can get rid of the spherical surface lens' shortcoming and will be highly valuable, so the study of image quality of rotational conicoid and its lens is meaningful.