Light flux controlling member, light-emitting device, surface light source device and display device
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.
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