| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device capable of irradiating light at a given angle without use of an angle adjustment mechanism and attaining its downsizing.SOLUTION: The lighting device is integrally provided with a plurality of prism parts A to F having prism faces A1 to F1 for totally reflecting and refracting collimated light 'a' incident, and light-emitting faces A2 to F2 for emitting refraction light a2 refracted as emission light a1. The prism parts A to F are so arranged to have the prism faces A1 to F1 headed in the same direction, and that, peak points P of the prism parts B to F adjacent to each other on an emission face A2 to F2 side are formed to be at positions where the emission light a1 is not in contact. |
