| 摘要 |
PROBLEM TO BE SOLVED: To securely fit a lighting unit and to effectively use the lighting unit except for a standard article by installing a ring which has an inner diameter fitted to the outer diameter of a lens and an outer diameter larger than an opening part and covers a gap between the opening part and the lens. SOLUTION: A ring 20 is laid between a cover body 13A and a lighting unit 5A. The lighting tool unit 5A is sandwiched by the ring 20 and a pressure metal fitting 21. Thus, it is fitted to the cover body 13A and it covers a gap between a lens 6 and an opening part 14. The ring 20 is a metallic and it has an outer diameter larger than the aperture D1 of the opening part 14 and an inner diameter fitted to the aperture D2 of the lens 6. An outer peripheral edge part is closely stuck to the rear face of the opening edge part 26 of the cover body 13A or is fixed by adhesive and a vis. An inner peripheral edge part is closely stuck to the outer peripheral part of the lens 6 through a packing 22. When the lighting unit 5A is sandwiched by the ring 20 and the pressure metal fitting 21, the lighting unit 5A whose lens diameter is small is securely fitted to the cover body 13A.
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