| 摘要 |
A LED illuminating device comprising: a plurality of LEDs (10a-10e); an optical element (20) of a substantially planar extension and having a substantially flat first surface (21) facing said LEDs (10a-10e); and a second prism-like surface (22) opposite to said first surface (21), said LEDs (10a- 10e) being divided into groups (11a-11e) and disposed in such a manner that main lighting directions (Da-De) of LEDs belonging to the same group form equal angles with the first surface (21) of said optical element (20), and main lighting directions (Da-De) of LEDs belonging to different groups form different angles with the first surface (21) of said optical element (20). |
