Light-emitting device, planar light source device and display device

A light emitting device comprising a light emitting element and a light flux controlling member configured to control a distribution of light emitted from the light emitting element,

• wherein an optical axis of the light emitting element and a central axis of the light flux controlling member are aligned with each other;
• wherein the light flux controlling member includes:
• an incidence surface that is an inner surface of a recess disposed to intersect the central axis and to open toward a rear side, the incidence surface being configured to allow incidence of the light emitted from the light emitting element;
• a light control surface disposed on a front side to intersect the central axis, the light control surface being configured to control a distribution of light entered from the incidence surface;
• a rear surface disposed on the rear side to surround an opening edge of the recess;
• and
• an annular groove formed in a circular shape in the rear surface to surround the opening edge of the recess;
• wherein the annular groove includes:
• a first inner surface disposed on a central axis side;
• and
• a second inner surface disposed at a position farther from the central axis than the first inner surface;
• and
• wherein the light control surface includes:
• a first transmission part disposed to intersect the central axis, and configured to allow, to pass through the first transmission part, a first light beam emitted from a light emission center of the light emitting element;
• a total reflection part disposed continuously from the first transmission part to surround the first transmission part, the total reflection part being configured to totally reflect a second light beam toward the second inner surface, the second light beam being a light beam emitted from the light emission center at an angle larger than that of the first light beam with respect to the optical axis;
• and
• a second transmission part disposed continuously from the total reflection part to surround the total reflection part, the second transmission part being configured to allow, to pass through the second transmission part, a third light beam emitted from the light emission center at an angle larger than that of the second light beam with respect to the optical axis, and the second light beam sequentially reflected by the total reflection part and the second inner surface.