| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for a lighting device and the like employing a bidirectional irradiation system with small light loss and high illuminance.SOLUTION: The lighting device comprises a light source and a lens. The lens comprises a first lens part and a second lens part. The first lens part condenses in a first direction a part of light emitted from the light source, and irradiates an irradiation target with condensed first condensation light. The second lens part condenses, in a second direction different from the first direction, another part of light emitted from the light source, and irradiates the irradiation target with condensed second condensation light via a reflection part from a direction different from that of the first condensation light. |
