| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive light transmission tube which emits light having high luminance while having directivity from its lateral peripheral surface, maintains an excellent light transmission characteristic in spite of adhesion of stains, etc., and has excellent mass productivity and which is excellent in executability. SOLUTION: This light transmission tube 1 has a tubular clad 3 and a core 2 composed of a material having the refractive index higher than the refractive index of this clad material, is formed with plural belt-like reflection layers 4 between the tubular clad 3 and the core 2 along the longitudinal direction thereof and is constituted to reflect and scatter the light passing the core 2 by these reflection layers 4 and to release the light from the outer peripheral surface of the tubular clad 3 on the side opposite to the side formed with the reflection layers. The outer peripheral shape of the cross section of the tubular clad 3 is noncircular. This light transmission tube may be produced by using a multicolor extruder. |
