ROAD ILLUMINATION LENS AND ROAD ILLUMINATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a road illumination lens through which a road illumination device installed on the upper part of a supporting column erected on a roadside in the approximately horizontal direction can illuminate a road wholly in the cross direction, and to provide the road illumination device.SOLUTION: The shape of the emission surface of the lens controls the course of light radiated from an LED so that the light is distributed in a longitudinal direction L of a road 2 in symmetry around a road illumination device 10. The shape of the entrance surface of the lens mainly controls the course of the light so that the light distributed in a cross direction W of the road 2 in asymmetry around the road illumination device 10 is delivered to the other side of the road 2 but it is not delivered to the opposite side thereof.