| 摘要 |
PURPOSE:To enhance the utilization efficiency of the light of a light source and to make the radiation of the light of uniform luminance possible, without complicating a working process by providing a housing part in the vicinity of the end part of a light transmission plate and installing the light source inside the housing part. CONSTITUTION:The light transmission plate 12 having the formation of a reflection plate 11 on a back surface and first/second diffusion plates 13 and 14 on the surface and the light source 16 are provided, the housing part 15 is provided in the vicinity of the end part of the light transmission plate 12 and the light source 16 is arranged in the housing part 15. Further, the right surface R of the right housing part 15 and the left surface R of the left housing part 15 are mirror finished and the light radiating outside is efficiency reflected on the center of the light transmission plate. Moreover, the reflection plate 11, the light transmission plate 12 and the diffusion plates 13 and 14 are punched by a die so as to enter into the light source. However, when either of the reflection plate 11 or the diffusion plates 13 and 14 are punched, the light source can be easily housed so that it is unnecessary that all of them are punched. |
