| 摘要 |
PURPOSE:To obtain a transparent molded plate contg. no strain generated by setting, and having superior dimensional precision and superior optical characteristics by irradiating a part of reactive liquid resin filled in a mold with ultraviolet rays, forming thus, hardened resin layer, gelled resin layer, and unreacted resin layer, and repeating the procedure by moving the position of irradiation with the ultraviolet rays. CONSTITUTION:Photopolymerizable liquid reactive resin 3 is filled in a space formed in a mold 20. Major part of the mold 20 is shielded with a light shielding plate 5, and a part of the reactive liquid resin is allowed to react by irradiating a quartz glass plate 1 perpendicularly with ultraviolet rays (UV) to form thus a zone of unreacted reactive liquid resin 3, gelled part 7, and hardened part 8 due to irradiation with UV, in the same mold. Then, the light shielding plate 5 is lifted gradually to increase the area for transmitting UV through the mold, and the zone 8 of hardened resin. After forming a hardened product to a predetermined dimension by repeating the above described procedures, whole of the reactive liquid resin 3 is hardened by irradiating a liquid introducing part Q with UV. |
