Light flux controlling member, light emitting device and illumination apparatus

摘要

Incidence region 162 of light flux controlling member 160 includes first lens region 10 and second lens region 50 which have a fan shape in a plan view thereof. First lens region 10 includes a plurality of first projections 172. In first inclining surface 174 of first projection 172, angle θ11 on a first cross section and angle θ21 on a second cross section in a direction orthogonal to the first cross section are both larger than 0°. In second inclining surface 176, angle θ12 on the second cross section is larger than angle θ22 on the second cross section.

主权项

1. A light flux controlling member which controls light 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 from which the light incident from the incidence region is emitted, wherein the incidence region comprises a first lens region and a second lens region which respectively have a fan shape in a plan view thereof, the first lens region comprises a projection having an arc shape in a plan view of the projection, the projection having a first inclining surface on which part of the light emitted from the light emitting element is incident and a second inclining surface at which the light incident from the first inclining surface is reflected toward the emission region, the second lens region receives the other part of the light emitted from the light emitting element and directs the incident light toward the emission region, and when a straight line which passes through an intersection point of a radius of the fan shape of the first lens region and a radius of the fan shape of the second lens region and which is parallel to a direction in which the incidence region is viewed in a plan view thereof is defined as a central axis of the light flux controlling member, a cross section of the projection when cut at a position on a first plane which includes the central axis and which passes through the center of the arc of the projection is defined as a first cross section, and a cross section of the projection when cut on a second plane which includes the central axis and which intersects with the first plane is defined as a second cross section, on the first cross section, when a vertex angle of the projection is divided by a straight line parallel to the central axis, an angle formed by the first inclining surface with respect to the straight line is defined as θ11, and an angle formed by the second inclining surface with respect to the straight line is defined as θ12, and on the second cross section, when the vertex angle of the projection is divided by the straight line, an angle formed by the first inclining surface with respect to the straight line is defined as θ21, and an angle formed by the second inclining surface with respect to the straight line is defined as θ22, the angle of θ11 and the angle of θ21 are both larger than 0°, and the angle of θ12 is larger than the angle of θ22.