| 摘要 |
<p>A lens (1) has a concave shape or a convex shape in either vertical cross section or transverse cross section. Thereby light passing through the lens is largely refracted and the interior is harder to be seen even if no prism is formed on said lens. As a result, there is no need to give a finish more than optical performance required for reflection to the front surface of the reflecting surface of a reflector (3), which is for the purpose of enhancement of its appearance, and thereby the machining work is simpler than the conventional way. Further, since the lens (1) has a flat shape in either vertical cross section or transverse cross section, the lens (1) is easily polished when it is made of glass, which is excellent in manufacture of the lens. <IMAGE></p> |
