| 摘要 |
PROBLEM TO BE SOLVED: To provide a sunlight illumination apparatus capable of ensuring a low cost and excellent weather resistance, and achieving optical branching with low loss.SOLUTION: In a sunlight illumination apparatus 1 introducing sunlight from a solar concentration unit 3 installed outdoors via a light guide 4, and radiating the sunlight from a light emission end 5 installed indoors to illuminate an indoor space, the light guide 4 is provided to extend to the light emission end 5 via a connection point P installed indoors, a quartz light guide 11 is laid out between the solar concentration unit 3 and the connection point P and a liquid core light guide 21 is laid out between the connection point P and the light emission end 5 as the light guide 4. In a case of performing optical branching, an optical branching unit is provided at the connection point P and a plurality of liquid core light guides 21 are connected to the optical branching unit. |
