公开(公告)号：US10260710B2

公开(公告)日：2019-04-16

申请号：US15220738

申请日：2016-07-27

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Hyun Choi ,  Cheoul Young Kim ,  Keun Bum Lee ,  Seung Jae Lee ,  Young Chol Lee ,  Yae Kyung Son

IPC: F21V13/04 ,  F21V7/00 ,  F21V7/06 ,  F21V5/04

Abstract: A direct-type reflective diffusion lens and a lighting installation including the reflective diffusion lens. The reflective diffusion lens includes a first reflective surface concave and having a longitudinal cross-section with a parabola shape or normal distribution shape to totally reflect incident light, and a bottom surface comprising a light incident surface concave toward the first reflective surface. The reflective diffusion lens includes a second reflective surface having a longitudinal cross-section inclined by a first angle with respect to a central axis of the lens to totally reflect incident light and a refractive surface connecting the first reflective surface with the bottom surface. The refractive surface includes a first refractive surface having a longitudinal cross-section inclined by a second angle with respect to the central axis and a second refractive surface having a longitudinal cross-section inclined by a third angle with respect to the central axis.