LENS AND ROAD ILLUMINATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a lens for preventing the emission of light in an undesired direction, and to provide a road illumination device.SOLUTION: If light is essentially emitted to an emission avoidance range 51 when a lens surface 44a having a concave and a convex combined is extended, the lens surface 44a is terminated at a site of the emission avoidance range 51 and a non-lens part 61 (for example, a total reflection surface 62 is formed) which includes a planar entrance surface 44b bent and continued from the termination is arranged there for changing over the course of the light into a direction where the light cannot be controlled when the continued lens surface 44a is extended.