| 摘要 |
PURPOSE:To improve the visual recognition not only in a far distance but also at the feet, and to make it possible to use the running beams for passing beams in a high speed running concurrently, by making the focus distance of an upper side reflection surface longer than that of a lower side reflection surface, and arranging a light source for the running beams near the focus of the lower side reflection surface in almost parallel to the optic axis of the reflection surface. CONSTITUTION:The focus distance of an upper side reflection surface 3 is made longer than that of a lower side reflection surface 4, and the focus f1 of the upper side reflection surface and the focus f2 of the lower side reflection surface are almost at the same point in a plain observation. On the other hand, a light source 10 is arranged in almost parallel to the optical axis of the reflection surface, and at the front side of the focus f1 of the upper side reflection surface 3. And the light reflected by the upper side reflection surface 3, among the light of the running beams light source, is radiated to the far distance, contributing to the far distance visual recognition, while the light reflected by the lower side reflection surface 4 has a relatively large expansion, thereby improving the recognition even at the feet. Consequently, the running beams can be used for a passing beams in a high speed running concurrently, consequently. |
