Alcon Inc.
INJECTION MOLDING APPARATUS AND METHOD FOR MANUFACTURING AN OPHTHALMIC LENS MOLD THROUGH INJECTION MOLDING

Abstract:

An injection molding apparatus for manufacturing an ophthalmic lens mold having a front surface comprising a lens forming portion and a rear surface, comprises a first molding tool and a second molding tool. The first and second molding tools are movable towards and away from each other between a closed position and an open position. In the closed position the first mold forming portion of the first molding tool and the second mold forming portion of the second molding tool define a cavity between them corresponding in shape to the shape of the ophthalmic lens mold. The surface of the second mold forming portion, at least in a central zone thereof, has a surface roughness S.sub.a in the range of 0.3 .mu.m to 2 .mu.m, and a surface roughness S.sub.z in the range of 10 .mu.m to 50 .mu.m.