| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the manufacturing of a perpendicular type illumination device by decreasing the number of reflection surfaces of a reflection plate in the device and simplifying it, and to secure high luminance and high uniformity by preventing reduction of luminance and uniformity caused by simplifying a reflection plate. SOLUTION: A reflection plate 5 of the perpendicular type illumination device is made of three sectioned reflection surfaces of a reflection plate 5a of a light source side, a reflection surface 5b of an intermediate part, and a reflection surface 5c of a side being apart from the light source, while, supply regions of reflected light by these reflection surfaces 5a, 5b, 5c for an illumination surface 6 are designated as A, B, C respectively, A is directed to a wide region of the illumination surface 6, B and C are directed to a center position between light sources or a position adjacent to the center position it, while luminance and uniformity are secured by making B and C transgress the border to the adjacent light source side slightly by the prescribed width from the center position between light sources. |
