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

摘要

PROBLEM TO BE SOLVED: To provide a luminous flux control member configured to control distribution of light emitted from a light-emitting element and capable of efficiently utilizing light surface-reflected on an emission surface while suppressing generation of luminance unevenness.SOLUTION: A luminous flux control member 300 includes an incident surface 320 on which light emitted from a light-emitting element 220 is made incident, an emission surface 330 for emitting the light made incident from the incident surface 320 to the outside and a plurality of projection strips 352 with substantially triangular cross sections formed on the rear side of the member 300 so as to surround a center axis CA. Each of the plurality of projection strips 352 includes a first reflection surface 352a, a second reflection surface 352b and a ridge line 352c to be an intersection line of the first reflection surface 352a and the second reflection surface 352b. A virtual straight line including the ridge line 352c intersects with the center axis CA on a position located further on the surface side than the ridge line 352c.