| 摘要 |
PROBLEM TO BE SOLVED: To perform required overhead sign irradiation without reducing light quantity for forming a luminous distribution pattern and without damaging the outside appearance of a luminaire. SOLUTION: Reflecting treatment by chromium plating is performed in a region A on the inner surface of a shade main body 22a of a shade 22 formed so as surround a bulb 18, and non-reflecting treatment by black coating is performed in a region A. Light from a filament 18a reflected in the region B having high reflectance is reflected on a reflecting surface 20a of a reflecting mirror 20, transmitted through a lens 12, and applied to the front upper part of a lighting device. Light necessary for overhead sign irradiation can be obtained without any work of the reflecting mirror 20 and the lens 12. Since the reflecting light from the region A is hardly generated, an adverse effect on formation of luminous distribution pattern can be prevented. |
