| 摘要 |
PURPOSE:To make it possible to light both the short distance and long distance adequately by providing the filament of a light source bulb in a specific form, and arranging reflection areas divided into three which are connected to the central reflection surface of a reflector and formed of minute surface groups of specific directions respectively. CONSTITUTION:A filament 12a of a light source bulb 12 is provided on the axis of a reflector 10, and reflection areas B-D divided into three different reflection surfaces connected smoothly to both sides of a central reflection surface A are arranged to the reflector 10. The areas B-D are formed of minute surface groups of different directions respectively, and the reflected lights from the areas B-D are focused near the center K of the upper end of a shade 16 close to a convex lens 14, in the horizontal area including the positions apart a specific distance horizontally from the center K, and in the vertical area including the positions extending downward from the center K. As a result, the luminous light has a sufficient expansion and brightness in the lateral direction while maintaining a high brightness at the center. Consequently, both the short distance and long distance can be lighted adequately. |
