| 摘要 |
A retro-reflector system 20 suitable for a highway lane marker is moulded in one piece from a transparent plastic material and has a plurality of side by side curved "roof edge" reflectors 21 (only one of which is illustrated) and a part elliptical lens 26 extending across the front "V" of each of the "roof edge" reflectors 21. A light ray on path 23 will pass through lens 26, be reflected by surfaces 22, 24, and will leave the lens 26 along a path 28 which is inclined slightly upwardly with respect to path 23 so that light from a vehicle's headlights will be directed upwardly towards the driver's head. |
