| 摘要 |
PROBLEM TO BE SOLVED: To improve light availability and to facilitate assembling work by providing a reflection layer provided with ink containing material having a reflection property for visible rays on a surface of a light guiding part of a light transmission plate. SOLUTION: A reflection layer 31 is formed continuously on the bottom surface, the right end surface, the front surface and the rear side surface of the light transmission plate 11, and a light shielding layer 32 is formed on the surface of the reflection layer 31. The reflection layer 31 consists of the material applied with white ink. As an applying method in such a case, e.g. the method that the light incident surface 11a and the light outgoing surface 11b of the light transmission plate 11 having grooves 16 molded by injection molding are masked, and the white ink is sprayed and applied the other surfaces exists. The light shielding layer 32 consists of the material applied with black ink having a light shielding property for the visible rays by the similar application method. The reflective component of the white ink and the white ink itself are an insoluble property or a hardly soluble property for the black ink. |
