| 主权项 |
1. A light flux controlling member configured to control distribution of light emitted from a light emitting element, the light flux controlling member comprising:
an incidence region on which the light emitted from the light emitting element is incident; and an emission region formed on a side opposite to the incidence region and configured to emit the light incident on the incidence region, the emission region having an area smaller than a projection area of the light flux controlling member, wherein: the incidence region includes
a refraction part on which a part of the light emitted from the light emitting element is incident, the refraction part being disposed at a center portion of the incidence region and configured to refract the incident light such that the incident light travels away from an optical axis of the light emitting element as the incident light propagates in the light flux controlling member, anda reflection part on which another part of the light emitted from the light emitting element is incident, the reflection part being disposed outside the refraction part and configured to reflect the incident light such that the incident light approaches the optical axis as the incident light propagates in the light flux controlling member;wherein the reflection part includes at least one protrusion having an annular shape and disposed to enclose the optical axis,wherein the protrusion includes:an incidence surface on which another part of the light emitted from the light emitting element is incident, anda reflecting surface disposed outside the incidence surface and configured to reflect light incident on the incidence surface in a direction approaching the optical axis; and the emission region emits light reflected by the reflection part such that the light approaches the optical axis as the light travels away from the emission region. |
