| 摘要 |
PROBLEM TO BE SOLVED: To constitute a lighting device that can be inserted into a low temperature bath alone by separating a photographing device and the lighting device into two bodies in consideration of handling and to achieve miniaturization in diameter and volume and weight saving. SOLUTION: The lighting device 10 is provided with a conical upper box 11, plural linear frame 12 that are arranged in the cylindrical axis direction along the cylindrical periphery and plural levels of socket sustaining parts 13, 13' that are sustained by the linear frame 12 and arranged in the cylindrical axis direction with given space, where a long cylindrical lamp 15 is fixed to each socket 14 equipped in the socket sustaining part 13. The long cylindrical lamp 15 has plural filaments 15a in its interior in the form that the plural filaments are connected in parallel. Furthermore, as a halogen lamp, the second quartz glass tube 15b that covers the first quarts glass tube 15a is provided, and this double tube structure gives heat insulation action to the first quarts glass tube 15a under halogen cycle. |
