Patent ID: 9616598
Date: 2017-04-11
CPC Classifications: B29C,B29D,B29L

Claim:
1. A method of manufacturing a plastic lens, which comprises: casting a plastic lens starting material liquid into a cavity in a forming mold and conducting a polymerization reaction of the plastic starting material liquid within the cavity to provide a molded article, wherein the forming mold is one in which two molds are disposed opposite each other, a gasket made of an elastic resin is disposed around the two molds to form the cavity, said two molds and said gasket each being a separate structure from the other structures, and at least one of the two molds is made of an elastic resin, one surface of the molded article is a convex surface and the other surface of the molded article is a concave surface, and the method comprises forming the concave surface by transferring a molding surface of the mold made of elastic resin, wherein among the two molds, one is a mold made of glass and the other is a mold made of elastic resin, wherein the gasket has a protruding band on an inner circumferential surface thereof, wherein in the forming mold, the protruding band comes into contact with a perimeter portion of the molding surface of the mold made of glass to hold the mold made of glass in position, wherein the protruding band is provided only on the glass mold side of the gasket and not provided on the elastic resin mold side of the gasket; wherein the molded article is a semifinished lens with one surface that is an optical surface in the form of a convex surface and another surface that is a non-optical surface in the form of a concave surface, and wherein the elastic resin is olefin resin.