| 摘要 |
PURPOSE:To position a light source correctly at the focal point of a reflecting plate, by making reference holes for light source positioning at right-angled intersections of an imaginary line passing a focal point on one side reflecting plate. CONSTITUTION:In side reflecting plates 3 and 3', reference holes 300 and 300' for light source positioning are made and, for example, filaments F of light sources 4 are arrayed at prescribed reference positions while visually confirmed through the reference holes 300 and 300'. During the adjustment of the positions of the light sources, when the reference hole 300' of one side reflecting plate 3' is irradiated with light having strong intensity from the reference hole 300 of the other side reflecting plate 3, the light is cut off unless the centers of the filaments F of the respective light sources 4 are aligned. For this purpose, the light sources 4 are moved and adjusted until the light is passed. |
