| 摘要 |
PROBLEM TO BE SOLVED: To provide a thin light guide body having high luminaire efficiency, and to provide a lighting system using the same.SOLUTION: The light guide body in this embodiment includes a light guide part, and an introduction part having an incident surface and a curved surface connected to the incident surface, and connected to the light guide part for introducing light to the light guide part. An angle &thetas; formed by a line segment between a first point on the incident surface and a second point on the curved surface and a normal line to the curved surface at the second point shows &thetas;≥sin(1/n), where n is the refraction factor of the light guide body. |
