| 摘要 |
PURPOSE:To manufacture a plastic lens with transfer of high precision without residual distortion by filling molten resin in a cavity section of a molding die with a mold surface, in contact with a non-optical surface of a molded product, having a porous component communicating with a compressed gas source disposed at least on a part of the mold surface. CONSTITUTION:A porous component 12 is built in in a manner to be in contact with the outer peripheral sections of respective cavity sections 11 in a movable side mold 6, and communicated and connected with a gas compression device 3 through a gas introducing hole 13 and a tube 14. Molten resin flows from an injection molding device 4 into respective cavity sections 11, and after a little time, a signal is issued to the gas compression device 3 and pressure is loaded in an outer peripheral section 15 of a lens as a molded product through the tube 14, the gas introducing hole 13 and the porous component 12, and the molded product is cooled in the state that pressure generated by the gas is applied to the lens outer peripheral section 15. Thus, sink marks can be generated only on the lens outer peripheral section 15 as the resin is contracted, and as a lens optical surface can be cooled and solidified in the state that the surface is adhered close to both cores 9 and 10, a plastic lens 11c with transferability of high precision can be molded. |
