LUMINOUS FLUX CONTROL MEMBER, LIGHT-EMITTING DEVICE, SURFACE LIGHT SOURCE DEVICE, AND DISPLAY DEVICE

摘要

This luminous flux control member (300) has: an incidence surface (320) through which light emitted from a light-emitting element (220) enters; an emission surface (330) through which the light entering from the incidence surface is emitted to the outside; and multiple ridges (352) that are formed on the back side so as to surround the central axis (CA) and that have a substantially triangular cross-sectional shape. Each of the multiple ridges (352) has a first reflecting surface (352a), a second reflecting surface (352b), and a ridge line (352c) which is the line of intersection of the first reflecting surface (352a) and the second reflecting surface (352b). An imaginary line containing the ridge lines (352c) intersects the central axis (CA) at a position closer to the front side than the ridge lines (352c).