| 摘要 |
The device has a cylindrical housing (1) containing at least one light source (18) whose light emanates via a flat boundary surface of a transparent part of a cover (2) flush with the road surface. The light from the source moves within the cover at an angle to the boundary surface close to the total reflection angle. The light source is mechanically connected to the cover, which can be joined to the housing at different angular settings. |
