| 摘要 |
PURPOSE:To expand the effective utilization range of a reflecting face by changing the heights and angles of multi-step circular reflecting face elements steplessly and continuously so that the light from a light source bulb is reflected in the preset direction. CONSTITUTION:A reflecting face provided on the front side of the bottom section of a housing 1 is constituted of multiple circular and stepless reflecting face elements 41 made of rotary paraboloids and having the same or common focal point F at the center of the filament 20 of a light source bulb 2 or near it and different focal distances respectively. The heights and angles of the stepless and circular rotary reflecting face elements 41 made of paraboloids are changed steplessly and continuously so that the light from the light source bulb 2 is reflected in the preset direction. The effective utilization range of the reflecting face 4 can be increased more widely. |
