METHOD FOR PRODUCING OPTICAL TRANSMISSION BODY OF SYNTHETIC RESIN

摘要

PURPOSE:To obtain an optical transmission body having a good index distribution efficiently in a short time by bringing monomer forming a polymer differing in refractive index from a net-like (co)polymer into contact with the transparent gel of said (co)polymer and irradiating UV rays thereto from the outside. CONSTITUTION:Polyfunctional monomers such as allyl compds. such as diallyl (iso)phthalate or the like, tetraethylene glycol dimethacrylate or the like are filled in a nylon tube or the like, whereby a transparent gel-like bar wherein the monomers are polymerized at 10-95wt% is manufactured. The bar is immersed for a specified time in a monomer forming a polymer having the refractive index larger or smaller than the refractive index that the (co)polymer pocesses and is then pulled up or while the bar is held in contact with the vapor of the monomer, UV rays are irradiated thereto from the outside. Thus the optical transmission body having the good index distribution wherein the refractive index increases or decreases gradually roughly in proportion to the square of the distance from the central axis of the bar is obtained quickly and efficiently.