a more integrated theory of design and analysis has been established for the sake of developing the condensing lens type large aperture frensnel lens.
建立了一套较完整的大口径聚光镜型菲涅耳透镜设计和分析理论。
a central axis is set at the loophole in the center of the circular-arc condensing lens and the bottom of each condensing lens is connected to an end of the flange by a plurality of link bars;