LUMINOUS FLUX CONTROL MEMBER, LIGHT EMITTING DEVICE, SURFACE LIGHT SOURCE DEVICE AND DISPLAY DEVICE

Japanese Patent JP2015197624

A

PROBLEM TO BE SOLVED: To provide a luminous flux control member capable of improving utilization efficiency of light emitted from a light emitting element.SOLUTION: The luminous flux member related to the present invention includes an incidence plane, a reflection plane, an annular groove including a first annular face and a second annular face, and a light-outgoing plane. The annular groove is disposed so as not to cross with an optical path of light exited from the center of the light emitting element, entering the incidence plane and reflected by the reflection plane, and to cross with an at least a part of an optical path of the light exited from a point other than the center of the light emitting element, entering the incidence plane, reflected by the reflection plane and reaching the light-outgoing plane. The second annular face is formed in such a way that the width of the annular groove expands from a trough part of the annular groove towards an opening edge of the annular groove, and refracts the light exited from the light emitting element, entering the incidence plane and reflected by the reflection plane, towards the front side.

JPS5662288	LAMPLESS SIGNAL ELEMENT
JPH0240602	OPTICAL DEVICE
JPS583214	[Title of the device] Color cone trawl light

HIRAKA KENSUKE

JP2014076152A

November 09, 2015

April 02, 2014

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ENPLAS CORP

G02B5/00; F21S2/00; F21V3/00; F21V5/00; G02B3/02; G02B5/02; G02B17/00; G02F1/13357; H01L33/58

JP2013020716A	2013-01-31
JP2011023204A	2011-02-03
JP2009117207A	2009-05-28
JP2010153328A	2010-07-08
JP2014007135A	2014-01-16

WO2013037288A1

2013-03-21

Koichi Washida

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