COLLECTING LENS AND MULTI-SEGMENT LENS

摘要

A collecting lens according to the present invention has a lens surface on a second surface opposite a first surface, wherein the lens surface comprises a plurality of lens function surfaces. Each of the lens function surfaces in the collecting lens comprises part of the side surface of an elliptical cone, and an arbitrary normal line crossing the lens function surface comprising part of the side surface of the elliptical cone from among the normal lines at the respective points on the first surface and the central axis of the elliptical cone corresponding to the lens function surface crossed by the arbitrary normal line are not in parallel, and the mutual central axes are not in parallel.