| 摘要 |
This light flux control member (200) comprises an entry surface (210), a reflective surface (220), a circular groove (230) containing a first circular surface and a second circular surface, and an exit surface (240). The circular groove is disposed in such a manner as not to intersect with the optical path of a light, from being emitted from the center of a light-emitting element (162) and entering at the entry surface, to being reflected at the reflective surface, and, in such a manner as to intersect with at least a portion of the optical path of a light, from being emitted from a point other than the center of the light-emitting element, entering at the entry surface and being reflected at the reflective surface, to reaching the exit surface. The second circular surface is formed in such a manner that the width of the circular groove widens as the opening ridges of the circular groove is approached from the valley portion of the circular groove, and causes a light that is emitted from the light-emitting element, enters the entry surface and is reflected at the reflective surface to be refracted outward. |
