| 摘要 |
PROBLEM TO BE SOLVED: To provide a radiation side reflection means that can obtain uniform radiation light for a wide area in which point light sources with strong directivity are used, increase of thickness in a radiation direction of the point light sources is avoided while light is utilized in high efficiency, and moreover, bright spots are not left at a part right above an radiation side reflection part covering the point light sources, and still, on the contrary, the part right above is not darkened.SOLUTION: The radiation side reflection means includes a plurality of central reflection parts 6A having a size of a specific range and an outward reflection part 6B on an outer circumference of the central reflection part 6A. The outward reflection part 6B is made of a reflection member which transmits, reflects, and irregularly reflects part of light and has a specific reflectance, and the central reflection part 6A is formed of a light-transmitting reflection part having a higher reflectance than that of the outward reflection part 6B. |
