| abstract |
(57) [Summary] [Problem] It can be used without problems even in places where there is a risk of explosion, such as underwater, rainy or snowy, and sufficient side emission can be obtained even with low power, and it is more compact and installation location There are few restrictions. SOLUTION: An optical transmission tube 1 comprising a transparent core material and a clad material having a smaller refractive index than the core material, and a light source disposed at least at one end in the length direction of the optical transmission tube 1 in a waterproof state. 2 and a lighting device 3 for lighting the light source 2, and the light incident from the light source 2 is transmitted to the light transmission tube 1. In the linear light-emitting body that emits light from the side surface in the longitudinal direction, a light-emitting diode driven by a small power is used as the light source 2 and the light source 2 is provided with a waterproof means 21. |