| 摘要 |
PURPOSE: To improve the visibility at a curve. CONSTITUTION: A diffusive light distribution pattern WP can be changed to a fixed reference light distribution pattern LP by rotating a lower reflector 3 to an upper reflector 2. As a result, the visibility at a curve can be improved. The lower reflector 3 is rotatably mounted in an opening 23 of the upper reflector 2. As a result, the design of a luminous surface is not impaired and the rigidity of the upper reflector 2 is not lowered, as the circumference of the lower reflector 3 at a movable side is surrounded by the upper reflector 2 at a fixed side, and the shape of the upper reflector 2 is not changed even in the rotation of the lower reflector 3. |
