Patent ID: 7842203

Claim:
A method for manufacturing a spectacle plastic lens, comprising the steps of forming a spectacle plastic lens molding mold by incorporating, in a gasket, a first mold with a lens molding surface that forms one lens surface of the spectacle plastic lens and a second mold with a lens molding surface that forms the other lens surface of the spectacle plastic lens to be spaced apart from each other at a predetermined gap, and filling a lens raw material into a cavity of the spectacle plastic lens molding mold, and curing the lens raw material, characterized in that the gasket includes a cylindrical gasket main body and an elastic projecting band which integrally projects on an inner circumferential wall of the gasket main body throughout an entire circumference, the projecting band includes a ring-like proximal end portion which projects from the inner circumferential wall of the gasket main body to extend in a direction substantially perpendicular to an axial direction of the gasket main body a tapered distal end portion which extends in a direction substantially parallel to the axial direction of the gasket main body, and a bent portion bend-connecting the proximal end portion and the distal end portion, the proximal end portion flexes more than the distal end portion around the bent portion as a border when pushed from the distal end portion side [M.Y1] downward along the axial direction of the gasket main body, the incorporating step comprises the steps of elastically deforming the gasket main body in the diameter-enlarging direction, holding at least one of the first mold and the second mold by pressing a circumferential surface of said one mold in a diameter-reducing direction with a restoring force of elastic deformation, and when holding said one mold, bringing a vertex of the distal end portion into linear contact with the lens forming surface of said one mold while the distal end portion undergoes a smaller flexure in a direction perpendicular to the axial direction of the gasket main body than a flexure undergone by the proximal end portion in the axial direction of the gasket main body.