Patent ID: 7695653
Filing Date: 2010-04-13
Classification: B29D,G02B,G02C

Abstract:
1. A method of making a polarized lens comprising the steps of: progressively wetting, stretching, dyeing, and cleaning a polyvinyl alcohol (PVA) film by an assembly line having rollers so as to let molecules of the PVA film have a parallel linear direction; providing a holder having a lower frame and an upper frame coupled by a hinge; clipping the PVA film by having the upper frame closed onto the lower frame wherein a first surface of the PVA film faces the lower frame and a second surface of the PVA film faces the upper frame so that both of the upper frame and the lower frame with two opposite plates clip the PVA film along a direction perpendicular to the parallel direction of molecules in order to prevent the PVA film itself from shrinking; pressing a convex mold against the first surface of the PVA film through an opening of the lower frame of the holder, thereby substantially conforming the PVA film to the convex mold, and the first surface becoming a concave surface and a second surface opposite the first surface becoming a convex surface; drying the PVA film; applying a quantity of first polyurethane (PU) mixture on a center of an upper surface of a concave mold; up-side down pressing the convex mold having the second surface of the PVA against the first PU mixture so as to form a laminated first PU film by spreading the first PU mixture in a circular motion and help remove air bubbles; hardening the laminated first PU film; removing the concave mold to expose the convex surface of the first PU film; applying a quantity of first epoxy on a center of an upper surface of a concave mold; up-side down pressing the convex mold having the convex surface of the PU film against the first epoxy so as to form a laminated first epoxy film by spreading the first epoxy in a circular motion and help remove air bubbles; hardening the laminated first epoxy film; removing the concave mold and the convex mold.