US 12,393,079 B2
Light emitting device, light flux controlling member and surface light source device
Takuro Momoi, Kawaguchi (JP); and Yuki Fujii, Kawaguchi (JP)
Assigned to Enplas Corporation, Kawaguchi (JP)
Filed by Enplas Corporation, Kawaguchi (JP)
Filed on Aug. 28, 2024, as Appl. No. 18/817,623.
Claims priority of application No. 2023-142878 (JP), filed on Sep. 4, 2023.
Prior Publication US 2025/0076708 A1, Mar. 6, 2025
Int. Cl. G02F 1/1335 (2006.01); G02F 1/13357 (2006.01)
CPC G02F 1/133607 (2021.01) [G02F 1/133603 (2013.01); G02F 1/133605 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A light emitting device comprising:
a substrate;
a light emitting element disposed on the substrate and including a light reflection film at a top surface;
a light flux controlling member including a recess, a first reflecting surface, and an emission surface, the recess being disposed on a rear side to cover the light emitting element and configured to transmit light emitted from the light emitting element, the first reflecting surface being disposed on a front side and configured to reflect a part of light transmitted through the recess in a direction that is substantially perpendicular to a central axis of the light emitting element and is away from the central axis, the emission surface being configured to emit to an outside another part of the light emitted from the light emitting element and light reflected at the first reflecting surface; and
a light transmissive resin provided in the recess to seal the light emitting element and bond the light flux controlling member to the substrate and the light emitting element,
wherein in a see-through plan view, an end of the first reflecting surface on the central axis side is located inside an outer edge of the light emitting element, and a distance between the end of the first reflecting surface and the outer edge is 25% or less of a length of a minor axis of the light emitting element passing through a center of the light emitting element.