| 摘要 |
PROBLEM TO BE SOLVED: To provide a thin plane lighting system capable of obtaining the uniform emitting light of high luminance from the surface parts even when one of a pair of light source lamps is not lighted for any cause. SOLUTION: A plane lighting system has a first light conductive plate 12a where an interval between the surface part 15a and the reverse part 16a becomes narrow as it proceeds to the reflecting end surface part 19a side, a second light conductive plate 12b where an interval between the surface part 15b and the reverse part 16b opposed in a closely adjacent state to the reverse part 16a of the first light conductive plate 12a becomes narrow as it proceeds to the reflecting end surface part 19b side, light source lamps 14a, 14b for respectively projecting the light toward the incident end surface parts 13a, 13b of the light conductive plates 12a, 12b, a light reflecting sheet 17 for covering the part except for the surface parts 15a, 15b and the incident end surface parts 13a, 13b of the light conductive plates 12a, 12b and the reverse part 16a of the first light conductive plate 12a and light deflecting means 21, 26 for deflecting the light in the prescribed direction by being respectively formed in at least one of the surface parts 15a, 15b and the reverse parts 16a, 16b of the light conductive plates 12a, 12b. |
