LENS AND MANUFACTURING METHOD OF LENS

摘要

A light incident surface of a lens is determined to have a shape of a virtual light incident surface (SF1). The virtual light incident surface (SF1) is defined based on normal directions (ni) respectively calculated at a plurality of light incident points (Pi) of the virtual light incident surface (SF1) such that lights emitted from a first light emitting point (S1) and incident on the respective light incident points (Pi) are projected onto a first projection point (r1) and that lights emitted from a second light emitting point (S2) and incident on the respective light incident points (Pi) are projected onto a second projection point (r2) spaced in a predetermined direction from the first projection point (r1).