| 摘要 |
PROBLEM TO BE SOLVED: To suppress luminance unevenness in an illumination signboard comprising a light source, a light guide plate and a diffuser.SOLUTION: An illumination signboard (10) is configured so that a surface of a light guide plate (35) facing an opal translucent plate (15), or a surface of the opal translucent plate (15) facing the light guide plate (35) has an irregular structure, or a lens sheet (14) having an irregular structure on at least its one surface, is provided between the light guide plate (35) and the opal translucent plate (15). |
