| 摘要 |
PURPOSE: To improve a fusing property between a reflector and a front surface lens, by integrally forming an annular stepped part, having a surface facing almost forward, in a position slightly near to an inside than the opening edge of the reflector. CONSTITUTION: A trianglular protruded stripe 13, having the cross section surface shape of neary a triangle, is formed in the inner surface 2a of a reflector 2 at a portion slightly near to an inner side than the opening edge of the inner surface 2a, and has a smooth front surface 13a facing the front side to be formed integrally with the reflector 2 so as to be extended in the peripheral direction of the reflector 2. In a lens 4 before mounted on the reflector 2, a surface 14 to be butted, facing to a rear side, is formed on the outer peripheral part of the lens 4, and a recessed thread 15, to which a protruded stripe 12 can be neraly exactly fitted, is formed on a portion opposite to the stripe 12 out of the surface 14. When the lens 4 is placed on the front surface of the reflector 2, the stripe 12 is fitted to a recessed stripe 15 to be positioned to the reflector 2. Moreover, the stripe 13 is formed so that the front surface 13a of the thread 13 can be inhibited to contact the inner side surface 4a of the lens 4 in this condition. |
