公开(公告)号：US20200089059A1

公开(公告)日：2020-03-19

申请号：US16469759

申请日：2017-08-15

Applicant: Enplas Corporation

Inventor： Masato NAKAMURA

IPC: G02F1/1335 ,  G02B27/01

Abstract: When the focal distance of the first luminous flux control member is f, and the distance between a first central axis and an optical axis in the light emitting element separated farthest from the first central axis is d, the planar light source device satisfies −0.6

公开(公告)号：US20170198884A1

公开(公告)日：2017-07-13

申请号：US15326165

申请日：2015-06-24

Applicant: Enplas Corporation

Inventor： Masato NAKAMURA

IPC: F21V13/04 ,  F21K9/237 ,  F21V3/02 ,  F21K9/232 ,  F21V5/04 ,  F21V7/04

CPC classification number: F21V13/04 ,  F21K9/232 ,  F21K9/237 ,  F21V3/02 ,  F21V5/04 ,  F21V5/045 ,  F21V7/0008 ,  F21V7/04 ,  F21V7/041 ,  F21V17/06 ,  F21Y2115/10

Abstract: This light flux control member comprises a first (second) light flux control member. The first light flux control member comprises an entry region including a Fresnel lens portion and an entry surface; an exit surface; and a reflective surface. The reflective surface is a rotationally symmetric surface with the central axis of the first light flux control member as the rotation axis. The reflective surface is formed such that the generatrix of the reflective surface is a concave curve relative to the entry surface and the outer peripheral portion of the reflective surface is distanced farther from an orthogonal plane compared to the inner peripheral portion thereof in a direction that follows an optical axis, which is the center of the total light flux of at least one light-emitting element, said orthogonal plane passing through an arbitrary point on the entry surface and being orthogonal to the optical axis.