| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a traffic sign free from a problem on burning-out of bulbs, dispensing with its maintenance (maintenance free), reducing the power consumption and the manufacturing prime cost, and free from fringes in the beam and the unevenness in lighting. <P>SOLUTION: In this traffic sign having the combination of an optical waveguide 1, a sign board 4, and a light source. The optical waveguide is a disc-shaped or polygonal transparent plastic plate having a reflecting face and a light emitting face opposite to each other in parallel, and a light entering end face vertical to these faces, so that the light entered from the light entering end face is scattered and reflected by the reflecting face while fully reflected between the reflecting face and the light emitting face and the light is emitted from the light emitting face. The sign board is mounted oppositely to the light emitting face of the optical waveguide, and the light source is a linear illuminant mounted oppositely to the light entering end face of the optical waveguide. <P>COPYRIGHT: (C)2004,JPO |
