PRODUCTION OF OPTICAL TRANSMISSION BODY MADE OF SYNTHETIC RESIN

摘要

PURPOSE:To obtain a stable optical transmission body having the optical transmission characteristics which do not change with every production lot by dividing a stage for diffusing and impregnating a polymerizable monomer to >=2 stages, varying the diffusion rate of the monomers to be diffused and impregnated in each stage and diffusing and impregnating the monomers in order of the higher diffusion speeds. CONSTITUTION:The optical transmission body made of the synthetic resin having the refractive index distribution continuous from the center toward the surface is produced by diffusing and impregnating the polymerizable monomer (B) forming the polymer having the refractive index different from the refractive index of a crosslinked polymer (A) having a required network density to said polymer to apply the concn. distribution continuous from the center toward the surface to the polymer, then polymerizing the unreacted monomer. The stage for diffusing and impregnating the polymerizable monomer (B) is divided to >=2 stages and the monomers to be diffused and impregnated in the respective stages are varied. The monomers are diffused and impregnated in order of the higher diffusion rates. The disturbance in the refractive index distribution in the surface layer is thereby obviated and the change in the optical transmission characteristics with every production lot is prevented.