| 摘要 |
PROBLEM TO BE SOLVED: To provide a molding method of a plastic optical element which allows multicavity molding at low pressure without necessitating complex mold structure and expensive molding equipment, and to provide an optical element with less inner distortion by inducing sink marks only to non-optical surfaces. SOLUTION: In the method for molding the plastic optical element comprising injecting and filling a thermoplastic resin material of higher temperature than its softening temperature into a cavity having at least one optical surface and taking out the molding by opening the mold after cooling the material below the softening temperature, when critical dwell pressure not generating a sink mark on the optical surface is defined as (a) and critical dwell pressure not generating a sink mark on the non-optical surface is defined as (b), dwell pressure (c) at filling the resin into a cavity having at least one convex shape on the non-optical surface is controlled within the range of a<b<c. COPYRIGHT: (C)2007,JPO&INPIT |
