| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical member capable of easily obtaining light distribution, in a periphery of an optical axis a light source, making uniform intensity from a side closer to the light source to a far side.SOLUTION: An optical member 1 receives incident light emitted from a light source 200, emits while controlling light distribution of the incident light. The optical member 1 includes: a reflection surface 2 that reflects part of light emitted from the light source 200 and incident inside the optical member 1, in an illumination direction; and an emission surface 3 that emits the light incident inside the optical member 1, in the illumination direction. The emission surface 3 includes an on-axis concavity 4 having a center of the concavity on an optical axis X; and an annular concave part 5 arranged in a periphery of the on-axis concavity 4, formed annular around the optical axis. |
