| 摘要 |
PROBLEM TO BE SOLVED: To decrease the number of mounting parts of a fluorescent fiber by providing the outer periphery of this fluorescent fiber with a transparent protective body, fixing the fluorescent fiber to a permanent magnet via this protective body and attracting the assembly to the inside wall of a container. SOLUTION: The fluorescent fiber 1 is covered with the transparent protective body 27 and the permanent magnet 26 is adhered to its rear surface. The permanent magnet 26 is attracted to the inner side 8A surface of the hermetic container 8 made of iron. The fluorescent fiber 1 and the protective film body 27 may be tightly adhered to each other or may be held by providing a clearance. The loss of light at the boundary is less and a better result is obtd. if both are in tight contact with each other. The permanent magnet may be divided into a plurality and may be lined up apart spacings in the axial direction of the fluorescent fiber. As a result, just two parts, the protective body and the permanent magnet are necessitated for mounting the fluorescent fiber and the number of parts is drastically reduced. The number of the permanent magnet is decreased by increasing the spacings between the permanent magnets. |
