PREPARATION OF FRESNEL LENSES BY RADIATION CAST POLYMERIZATION

Preparation of Fresnel lenses was investigated applying radiation polymerization of methyl methacrylate prepolymer systems containing polyfunctional monomers. Line focus Fresnel lenses 75 × 75 cm could be prepared in very short time cycles with sufficient exactness by radiation cast polymerization, preferably at low temperatures. Preparation of Fresnel lenses could be carried out also very easily and efficiently by printing the soft plastic prepolymer sheet with a Fresnel lenses mold and then curing it by irradiation. Copyright © 1979 John Wiley & Sons, Inc.