| 摘要 |
PROBLEM TO BE SOLVED: To obtain especially highly precise optical parts in long and large sized molded products in a short molding cycle by a method wherein a shape of resin matrix to be preworked in advance by injection molding is optimized, and the resin matrix is used. SOLUTION: A plastic molded product is manufactured by transferring a mirror surface with resin inner pressure following melt of resin by containing a process wherein resin matrix preworked in advance in an almost final shape by injection molding is charged into a cavity of a mold having at least one mirror surface, and slowly cooled to heat distorsion temperature of the resin or under. When a length in a vertical direction to a surface to which the mirror surface of the resin matrix 2 is transferred in h", and a length of the molded product 1 in a vertical direction to a surface to which the mirror surface is transferred by charging into the cavity of the mold having the mirror surface is h, fluctuation according to a place of h"/h is within 0.03. Thereby, pressure generated in a vertical direction to the transferred surface after charging into the mold having the transferred surface and raising temperature, becomes uniform, and the molded product of the highly precise transferred surface can be obtained in a short molding cycle. |
