Title:
LIGHT FLUX CONTROL MEMBER, LIGHT-EMITTING DEVICE, AND AREA LIGHT SOURCE DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/038810
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a light flux control member capable of suppressing brightness variation due to light refracted by an inclined surface. The light flux control member of the present invention comprises: an entry surface which is an inner surface of a recess portion formed on a back side and on which light emitted from a light-emitting element enters; an emission surface which is formed on a front side and which emits the light that has entered on the entry surface to the outside; and an annular groove portion which is formed on the back side so as to enclose a central axis outside the entry surface. The annular groove portion includes an outside inclined surface which is inclined more in a direction toward the back side with increasing distance from the central axis, and an inside surface disposed on the inner side than the outside inclined surface with respect to the central axis. The outside inclined surface is inclined at an angle such that at least some of the light that has entered the light flux control member via the entry surface and been Fresnel-reflected by the emission surface is reflected in a direction away from the central axis. The inside surface includes a plurality of retroreflective portions which cause the light entering from the entry surface to be reflected at least twice and reflected in a retroreflective manner in a direction toward the entry surface.
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Inventors:
MOCHIDA TOSHIHIKO
Application Number:
PCT/JP2016/075307
Publication Date:
March 09, 2017
Filing Date:
August 30, 2016
Export Citation:
Assignee:
ENPLAS CORP (JP)
International Classes:
F21S2/00; F21V5/00; F21V5/04; G02B3/08; G02B5/122; G02F1/13357; F21Y115/10
Domestic Patent References:
| WO2014033985A1 | 2014-03-06 |
Foreign References:
| JP2007294187A | 2007-11-08 | |||
| JP2011034770A | 2011-02-17 |
Attorney, Agent or Firm:
WASHIDA, Kimihito (JP)
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