| 摘要 |
PROBLEM TO BE SOLVED: To suppress deflection of a light distribution while downsizing is aimed at.SOLUTION: When all of LEDs 1 are mounted on a surface of a substrate 2 in the same direction, a light distribution of each of the LEDs 1 is deflected to the same side (a lower side in a fig.) of the substrate 2. As compared with this, when the LEDs 1 belonging to the same group are mounted on the surface of the substrate 2 in the same direction and moreover, when the LEDs 1 belonging to other groups are mounted on the surface of the substrate 2 in different directions, deflection (asymmetry) of the light distribution as seen from a length direction of the substrate 2 can be suppressed. Furthermore, since distances between neighboring groups of the LEDs 1 can be narrowed, deflection of the light distribution can be suppressed, while downsizing is achieving. |
