| 摘要 |
PROBLEM TO BE SOLVED: To provide a focus changing device for illumination assuring prolongation of the lifetime without the risk of being exposed to high temperatures and capable of changing to a desired focus in a short time. SOLUTION: An upward opening box 1 is installed on a spot light 15, and partioning pieces 2 extending up vertically inside the box 1 are arranged, in parallel in the light irradiating direction of the spot light, and each gap between adjoining partitioning pieces 2, 2 is used as an accommodation part 4 to accommodate a lens plate 3 capable of being drawn out upwardly, and thus a focus change device for illumination is configured, where below the accommodation part 4 an upheaving mechanism 8 is provided equipped with an upheaving piece 7 for upheaving and holding the lens plate 3 accommodated in the accommodation part 4. |
