2006-324134 is referenced by 9 patents.

PROBLEM TO BE SOLVED: To provide a downright surface light source device capable of restraining color shading or unevenness of light emission by using an appropriate number of light sources in accordance with a scale or request of lighting, without making a structure complicated.SOLUTION: Light is converged from a plurality of LEDs 2 with a small peak brightness to any one point on the light-emitting face and is mixed to irradiate surface white light, so that unevenness of an emission volume and color shading is averaged out as a single-body property, and a surface light-emitting device 1 with little emission unevenness and color shading can be obtained. Therefore, even if there are some LEDs 2 not lit due to failure, other LEDs 2 supplement light, so that there is little degradation of brightness with emission unevenness restrained.

Title
Surface light-emitting device
Application Number
2005-146565
Publication Number
2006-324134
Application Date
May 19, 2005
Publication Date
November 30, 2006
Inventor
Yamada Tomohiro
Kawamata Masatoshi
Nishikawa Akihiro
Yoshikawa Yukio
Aoki Kazuo
Assignee
Koha
IPC
F21Y 101/02
H01L 33/00
G02F 01/13357
F21S 02/00