| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a simple and economical lighting device capable of accurately detecting scratches or contamination. <P>SOLUTION: At a front of a light-emitting part 8 emitting diffusion light, parallel aggregations of hollow-shaped bodies 1 are laminated in multistage. In that case, a light extraction body having a structure emitting and extracting light of a direction crossing a progress direction of the diffusion light, is arranged. <P>COPYRIGHT: (C)2010,JPO&INPIT |
