LIGHT FLUX CONTROLLING MEMBER, LIGHT EMITTING DEVICE, SURFACE LIGHT SOURCE DEVICE AND DISPLAY DEVICE

WIPO Patent Application WO/2017/002686

A1

The purpose of the present invention is to provide a light flux controlling member that is unlikely to cause variations in brightness in light radiated from a light emitting device even when a light emitting element that emits a large amount of light in a lateral direction such as a COB-type LED is used. This purpose is achieved by a light flux controlling member that controls the light distribution of light emitted from a light emitting element. This light flux controlling member has: an incidence surface that is constituted by an inner surface of a first concavity formed on a rear side of the light flux controlling member so as to intersect a central axis thereof; an emission surface from which light incident on the incidence surface is emitted to the outside; and a second concavity that is formed on the rear side. The second concavity has a first inclined surface and a second inclined surface that are inclined with respect to an imaginary straight line that is perpendicular to the central axis. The second inclined surface is formed in a region that is closer to the central axis than the first inclined surface. The first inclined surface is inclined at an angle that reflects at least part of light which was incident on the light flux controlling member at the incidence surface and then Fresnel reflected at the emission surface.

FUJII YUKI
KAMIJO YU

PCT/JP2016/068545

January 05, 2017

June 22, 2016

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ENPLAS CORP (JP)

F21V5/00; F21S2/00; F21V5/04; G02B3/02; G02B5/00; G02F1/13357; F21Y115/10

WO2012164790A1

2012-12-06

JP2011044315A	2011-03-03
JP2009117207A	2009-05-28
US20140168999A1	2014-06-19

WASHIDA, Kimihito (JP)

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