Abstract: A surface light source device includes a plurality of light source blocks, each of which includes a light-emitting element array composed of a plurality of light-emitting elements arranged in the first direction. Each of the plurality of light-emitting elements includes a plurality of light emission chips arranged in the first direction, with different colors of emission light. In the light-emitting element array, the colors of the light emitted from the light emission chips at both end portions are the same.

Abstract: A light flux controlling member includes n incidence units for allowing incidence of light emitted from n light emitting elements, respectively; an emission unit disposed between the n incidence units and allowing emission of the light incident on the n incidence units while guiding the light; and a plurality of legs. Each incidence unit includes an incidence surface and a reflection surface reflecting, in a direction along the substrate, the light incident on the incidence surface. The emission unit includes a first emission surface emitting a part of the light from the incidence unit, and a second emission surface disposed so as to face away from the first emission surface and emitting another part of the light from the incidence unit. Each leg is disposed at a position satisfying a predetermined condition.

Abstract: A surface light source device includes a light-emitting device; and a light diffusion plate disposed over the light-emitting device. The light-emitting device includes a substrate, a plurality of light-emitting elements disposed on the substrate, and a sealing material disposed on the substrate and configured to seal the plurality of light-emitting elements, the sealing material being made of silicone or epoxy resin. The sealing material includes particles, the particles being optically transparent.

Abstract: A light flux controlling member includes a first optical surface, a second optical surface, a third optical surface, and a fourth optical surface. A part of light emitted from the light-emitting element and entered from the first optical surface is emitted from the second optical surface to outside of the light flux controlling member after being sequentially internally reflected by the second optical surface, the third optical surface and the fourth optical surface. A part of light emitted from the light-emitting element that is incident on the first optical surface is Fresnel-reflected, reflected by a surface of the substrate toward the first optical surface to enter the light flux controlling member from the first optical surface, and then emitted from the second optical surface to the outside of the light flux controlling member.

Abstract: A light flux controlling member includes a first optical surface, a second optical surface, a third optical surface, and a fourth optical surface. A part of light emitted from the light-emitting element and entered from the first optical surface is emitted from the second optical surface to outside of the light flux controlling member after being sequentially internally reflected by the second optical surface, the third optical surface and the fourth optical surface. A part of light emitted from the light-emitting element that is incident on the first optical surface is Fresnel-reflected, reflected by a surface of the substrate toward the first optical surface to enter the light flux controlling member from the first optical surface, and then emitted from the second optical surface to the outside of the light flux controlling member.

Abstract: A light flux controlling member includes an incidence surface, a reflection surface, an annular groove and an emission surface. The annular groove is disposed so as not to intersect an optical path of light incident on the incidence surface, reflected by the reflection surface, and reaching the emission surface. The first annular surface is formed so that its distance from the central axis increases, from the back side to the front side, and refracts, toward the front surface, light emitted from the light emitting center of the light emitting element, and directly reaching the first annular surface. The second annular surface is formed so that its distance from the central axis increases, from the back side to the front side, and refracts, toward the front side, light emitted from the light emitting element, incident on the incidence surface, and directly reaching the second annular surface.

Abstract: A surface light source device includes a housing; one or more substrates disposed in the housing, each of the one or more substrates having a substantially rectangular shape; a plurality of light-emitting devices disposed on the one or more substrates; and a light diffusion plate disposed over the plurality of light-emitting devices. Each of the light-emitting devices includes a light-emitting element and a light flux controlling member. The plurality of light-emitting devices is disposed on two or more first virtual lines that are parallel to each other and are parallel to one side of each of the one or more substrates. A light-emitting surface of the light-emitting element has a substantially rectangular shape in plan view. Of angles between each side of the light-emitting surface of the light-emitting element and each of the two or more first virtual lines, a smallest angle is 25 degrees to 45 degrees.

Abstract: A light flux controlling member includes n incidence units for allowing incidence of light emitted from n light emitting elements, respectively; an emission unit disposed between the n incidence units and allowing emission of the light incident on the n incidence units while guiding the light; and a plurality of legs. Each incidence unit includes an incidence surface and a reflection surface reflecting, in a direction along the substrate, the light incident on the incidence surface. The emission unit includes a first emission surface emitting a part of the light from the incidence unit, and a second emission surface disposed so as to face away from the first emission surface and emitting another part of the light from the incidence unit. Each leg is disposed at a position satisfying a predetermined condition.

Abstract: A light flux controlling member includes an incidence surface, a reflection surface, an annular groove and an emission surface. The annular groove is disposed so as not to intersect an optical path of light incident on the incidence surface, reflected by the reflection surface, and reaching the emission surface. The first annular surface is formed so that its distance from the central axis increases, from the back side to the front side, and refracts, toward the front surface, light emitted from the light emitting center of the light emitting element, and directly reaching the first annular surface. The second annular surface is formed so that its distance from the central axis increases, from the back side to the front side, and refracts, toward the front side, light emitted from the light emitting element, incident on the incidence surface, and directly reaching the second annular surface.

Abstract: A surface light source device includes a housing; one or more substrates disposed in the housing, each of the one or more substrates having a substantially rectangular shape; a plurality of light-emitting devices disposed on the one or more substrates; and a light diffusion plate disposed over the plurality of light-emitting devices. Each of the light-emitting devices includes a light-emitting element and a light flux controlling member. The plurality of light-emitting devices is disposed on two or more first virtual lines that are parallel to each other and are parallel to one side of each of the one or more substrates. A light-emitting surface of the light-emitting element has a substantially rectangular shape in plan view. Of angles between each side of the light-emitting surface of the light-emitting element and each of the two or more first virtual lines, a smallest angle is 25 degrees to 45 degrees.

Abstract: This light-emitting device has a light-emitting element and a light flux control member. The light flux control member has an entry surface, a light control surface, a back surface, and a ring-shaped groove. The light control surface includes a first transmission portion, a total reflection portion, and a second transmission portion. The ring-shaped groove includes a first inner surface and a second inner surface. A second light beam, which is a light beam that is part of the light beam emitted from the light-emitting center of the light-emitting element, enters the interior of the light flux control member at the entry surface, is totally reflected at the total reflection portion, then internally reflected at the second inner surface, and exits from the second transmission portion to the exterior of the light flux control member.

Abstract: This light-emitting device has a light-emitting element and a light flux control member. The light flux control member has an entry surface, a light control surface, a back surface, and a ring-shaped groove. The light control surface includes a first transmission portion, a total reflection portion, and a second transmission portion. The ring-shaped groove includes a first inner surface and a second inner surface. A second light beam, which is a light beam that is part of the light beam emitted from the light-emitting center of the light-emitting element, enters the interior of the light flux control member at the entry surface, is totally reflected at the total reflection portion, then internally reflected at the second inner surface, and exits from the second transmission portion to the exterior of the light flux control member.