| 摘要 |
PURPOSE:To change quantity of light of a lighting fixture easily in the case where specifications for the quantity of light are different by forming a reflector seating surface and an inner surface around a base seat part in a paraboloid in such a form that its center of curvature coincides with a light emission center of a bulb. CONSTITUTION:A leg part 11a of an invar cap 11 is inserted from the inner side into a leg insertion hole 8d of a reflector 8, and the leg part 11a is engaged and fixed on an installation hole 1c. The reflector 8 disposed in a lamp housing 1 can thus be seated on reflector seating surfaces 5a, 6a of base seats 5, 6, so the reflector 8 is fixed on the base seats 5, 6 of the housing 1 by the cap 11. In this condition, part of light from a bulb 10 is reflected by the reflector 8. In the case where the reflector 8 is not disposed in the housing 1, the seating surfaces 5a, 6a of the base seats 5, 6, and a bottom surface 7a act as a reflector, and part of light from the bulb 10 is reflected at the seating surfaces 5a, 6a and the bottom surface 7a. Reflectance of the seating surfaces 5a, 6a and the bottom surface 7a is lower than that of an inner surface of the reflector 8, thereby outgoing quantity of light becomes smaller. |
