Patent ID: 9683719
Date: 2017-06-20
CPC Classifications: F21K,F21V,F21Y,G02B,G02F

Claim:
1. A light flux controlling member configured to control a distribution of light emitted from a light emitting element, the light flux controlling member comprising: an incidence surface constituting an inner surface of a recess formed on a rear side of the light flux controlling member so as to intersect a central axis of the light flux controlling member, the incidence surface being configured such that light emitted from the light emitting element is incident on the incidence surface; an emission surface formed on a front side of the light flux controlling member so as to intersect the central axis, the emission surface being configured to output light entered from the incidence surface towards an outside; and a plurality of linear protrusions each having a cross-section that is substantially triangle-shaped, the linear protrusions being formed to surround an opening of the recess; wherein each of the plurality of linear protrusions includes a first reflection surface, a second reflection surface, and a ridge line that is an intersection line of the first reflection surface and the second reflection surface, each of the plurality of linear protrusions reflects light from the emission surface by sequentially reflecting at the first reflection surface and the second reflection surface, the plurality of linear protrusions are disposed rotationally symmetric about the central axis and are separated from the recess, and a virtual line including the ridge line intersects the central axis at a position which is farther into a front side area of the light flux controlling member than the ridge line.