Title:
LIGHT-EMITTING DEVICE, SURFACE LIGHT SOURCE DEVICE AND DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/002725
Kind Code:
A1
Abstract:
This surface light source device comprises a plurality of light-emitting elements, and a light flux control member containing a first light flux control member and a second light flux control member. The first light flux control member comprises: a concave first entrance surface disposed in such a manner as to intersect with a first central axis of the first light flux control member, and facing the plurality of light-emitting elements; and a first exit surface disposed on the side facing away from the first entrance surface, having an inner exit surface disposed in such a manner as to intersect with the first central axis, and an outer exit surface disposed in such a manner as to surround the inner exit surface and whereof the shape in the cross section is convex. The second light flux control member controls and causes the light exiting from the first light flux control member to become oriented in the direction along the first central axis. In addition, when f represents the focal distance of the first light flux control member, and d represents the distance between the first central axis and the optical axis in the light-emitting element farthest from the first central axis, the surface light source device satisfies -0.6 < d/f < 0.
Inventors:
NAKAMURA MASATO
Application Number:
PCT/JP2016/068823
Publication Date:
January 05, 2017
Filing Date:
June 24, 2016
Export Citation:
Assignee:
ENPLAS CORP (JP)
International Classes:
F21S2/00; F21V5/00; F21V5/04; F21V13/02; G02B27/01; G02F1/13357; F21Y115/10
Domestic Patent References:
| WO2014017652A1 | 2014-01-30 |
Foreign References:
| JPH05257114A | 1993-10-08 | |||
| JP2011044411A | 2011-03-03 |
Attorney, Agent or Firm:
WASHIDA, Kimihito (JP)
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