Patent ID: 9557035
Date: 2017-01-31
CPC Classifications: F21V,F21Y,G02B,G03B

Claim:
1. A light flux controlling member that controls a distribution of light emitted from a light emitting element, comprising: an incidence area configured to receive light emitted from the light emitting element; and an emission area formed opposite to the incidence area and configured to emit light incident on the incidence area, wherein: the incidence area includes: a fresnel lens part including a plurality of first protrusions, each having a first incidence surface configured to receive a part of the light emitted from the light emitting element, a first reflection surface formed to make a pair with the first incidence surface and configured to reflect light incident on the first incidence surface toward the emission area, and a first ridge line disposed between the first incidence surface and the first reflection surface and configured to connect two adjacent diagonal lines of a first virtual quadrangle; an outermost lens part including four second protrusions, each having a second incidence surface configured to receive another part of the light emitted from the light emitting element, and a second reflection surface formed to make a pair with the second incidence surface and configured to reflect light incident on the second incidence surface toward the emission area, each second protrusion being disposed on each side of a second virtual quadrangle disposed outside the first virtual quadrangle, and a third incidence surface disposed at each of four corners of the second virtual quadrangle and configured to receive a part of a rest of the light emitted from the light emitting element; and a reflector holding part for holding reflectors disposed at least at four corners of the second virtual quadrangle, the first virtual quadrangle and the second virtual quadrangle are disposed to be similar to and concentric with each other and to have their respective sides parallel to each other, and the incidence area has 2-fold symmetry or 4-fold symmetry about a center of the first virtual quadrangle and the second virtual quadrangle, as a rotation axis.