| 摘要 |
PURPOSE:To obtain a light transmission body with limited transmission loss by supplying a vinyl monomer to provide a low refractive index polymer and a vinyl monomer to provide a high refractive index polymer into a transparent reaction tube varying the vapor pressure ratio therebetween to be photopolymerized with ultraviolet rays irradiated from outside. CONSTITUTION:After a photopolymerization initiator and a thermal polymerization inhibitor are added thereto, for example, methyl methacrylate to provide a low refractive index polymer and stylene to provide a high refractive index polymer are put into a monomer container 3 in a polymerizer 9, fed to an ultraviolet ray tranmisivity reaction tube 1 from a pipe 5 passing through a hole of a light shield plate 7 and then, an ultraviolet rays 8 are irradiated thereinto outside the tube 1. As containers 3 and 1 are being rotated with a motor 6, the temperature within the apparatus 9 is raised gradually from the initial value of 40 deg.C to accomplish a polymerization. Initially, the methyl methacrylate with a low boiling point is evaporated dominantly and a steam rich in stylene with a high boiling point done later to perform a photopolymerization in the tube 1. After the completion of the polymerization, a polymerized rod is taken out, melted and drawn to obtain a small focusing element with a limited light loss. |
