| 摘要 |
PROBLEM TO BE SOLVED: To improve the evenness of light emission of a linear light source of a flat lighting system. SOLUTION: Each light scattering part 15 is inclined against the thickness direction of a light guide body 7, and a part of radiation ranges of the adjacent light dispersing part 15 are overlapped with each other in the axial direction of the light guide body 7. The light ranges La1, La2, La3, La4, La5 of the light, which is reflected by the light scattering parts 15 and enters a transparent board 2, per each beam in the longitudinal direction of the light guide body 7 is widened. The ranges La1, La2, La3, La4, La5 of the light reflected by each light scattering part 15 are overlapped with each other. With this structure, a part, from which the reflected light from an optical path changing means 11 of the light guide body 7 does not go out, is eliminated, and the light guide body 7 works as a light source for continuously emitting the linear light from a micro-visual point. |
