Title:
A surface light source device and a display
Document Type and Number:
Japanese Patent JP6188641
Kind Code:
B2
Abstract:
A surface light source device includes substrate, a plurality of light emitting devices disposed at constant intervals on substrate, and light diffusion plate disposed substantially parallel to substrate over the plurality of light emitting devices. Light emitting device includes light emitting element and light flux controlling member. A luminous intensity of light from light emitting device is gradually increased as an angle relative to optical axis becomes larger in an angular range from a direction along optical axis of light emitting device to a direction of emission of light with the highest luminous intensity from light emitting device. An angle of the light with the highest luminous intensity from the light emitting device is more than 78.7° relative to the optical axis. Surface light source device satisfies two Equations of H/P≦0.2, and I1/2/I0>6.
Inventors:
High Tori Hiroshi
Yamaguchi Masao
Yamaguchi Masao
Application Number:
JP2014128061A
Publication Date:
August 30, 2017
Filing Date:
June 23, 2014
Export Citation:
Assignee:
Enplus Inc.
International Classes:
F21S2/00; G02F1/13357
Domestic Patent References:
| JP2008305923A | ||||
| JP2009044016A |
Foreign References:
| US20060138437 | ||||
| WO2010146892A1 | ||||
| US20130050989 |
Attorney, Agent or Firm:
Koichi Washida
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