METHOD FOR MANUFACTURING OPTICAL COMPONENT

To provide a method for manufacturing an optical component having excellent mold transferability.SOLUTION: There is provided a method for manufacturing an optical component, which uses an injection molding equipment. The injection molding equipment comprises: an injection unit; and a mold 10 having a cavity 16 including a molding region 16a and a gate 18, in which the mold 10 is composed of a first mold 12 and a second mold 14, the first mold 12 has a molding surface 12a, the second mold 12 comprises a protruding core 15 configured to be slidable in a first mold direction, and the protruding core 15 has a molding surface 15a. The method for manufacturing the optical component comprises: a process of moving the protruding core 15 in a direction opposite to the first mold direction and then widening a width between the first mold 12 and the second mold 14 to expand the molding region 16a; a process of injecting and inserting a molten resin containing a copolymer of ethylene or α-olefin and a cyclic olefin into the cavity 16 through the gate 18; and a process of applying a holding pressure to the molten resin from the injection unit side and pressurizing the molten resin by the protruding core 15 while pushing the protruding core 15 provided in the second mold 14 to the molding region 16a.SELECTED DRAWING: Figure 1 【課題】金型転写性に優れている光学部品の製造方法を提供する。【解決手段】射出ユニットと、成形領域１６ａを含むキャビティー１６およびゲート１８を有する金型１０とを備え、金型１０は、第１金型１２および第２金型１４からなり、第１金型１２は、成形面１２ａを有し、第２金型１２は、第１金型方向に摺動可能に構成された突出しコア１５を備え、突出しコア１５は、成形面１５ａを有しており、突出しコア１５を第１金型方向とは反対の方向に移動させ、第１金型１２と第２金型１４との間の幅を広げて成形領域１６ａを拡張し、エチレンまたはα−オレフィンと環状オレフィンとの共重合体を含む溶融樹脂をゲート１８を介してキャビティー１６内に射出注入し、第２金型１４に備えられた突出しコア１５を成形領域１６ａまで押し込みながら、射出ユニット側から溶融樹脂に保圧をかけるとともに、溶融樹脂を突出しコア１５で押圧する。【選択図】図１