The calculated results show that the binary lens has practical application value in field flattening optical system.
计算结果表明，二元透镜在平场光学系统中具有实用价值。
A binary Fresnel lens with 8 phase steps can be manufactured with micro-optical element fabricating technology and three times of alignment according to Fresnel diffraction theory.
根据菲涅耳衍射理论，采用微光学元件制作技术，通过三次套刻制作出八位相台阶的二元离轴菲涅耳透镜。
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