Patent ID: 8057716

Claim:
A method of making a polarized lens comprising the steps of: progressively wetting, stretching, dyeing, and cleaning a first polyvinyl alcohol (PVA) film by an assembly line having rollers so as to let molecules of the first PVA film have a parallel linear direction; disposing a coating on the peripheral portion of the first PVA film; providing a first holder having a lower frame and an upper frame coupled by a hinge; clipping the first PVA film with a first surface thereof downward in the first holder, clipping the first 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 first PVA film along a direction perpendicular to the parallel direction of molecules in order to prevent the first PVA film itself from shrinking; pressing a first convex mold against the first surface of the first PVA film through an opening of the lower frame of the holder, thereby substantially conforming the first PVA film to the first convex mold, and the first surface becoming a concave surface and a second surface opposite the first surface becoming a convex surface; pressing a concave mold against the second surface of the first PVA film, thereby substantially conforming the first PVA film to the concave mold; drying the first PVA film; removing the first convex mold; progressively wetting, stretching, dyeing, cleaning a second polyvinyl alcohol (PVA) film by an assembly line having rollers so as to let molecules of the second PVA film have a parallel lineal direction; providing a second holder having a lower frame and an upper frame coupled by a hinge; clipping the second PVA film with a first surface thereof downward in the second holder, so that both of the upper frame and the lower frame with two opposite plates clip the second PVA film along a direction perpendicular to the parallel direction of molecules in order to prevent the second PVA film itself from shrinking; pressing a second convex mold against the first surface of the second PVA film through an opening of the lower frame of the holder, thereby substantially conforming the second PVA film to the second convex mold, and the first surface becoming a concave surface and a second surface opposite the first surface becoming a convex surface; drying the second PVA film; applying a quantity of glue on the center of the first surface of the first PVA film; up-side down pressing the second convex mold having the second surface of the second PVA film against the glue so as to form a laminated PVA film by spreading the glue in a circular motion; hardening the laminated PVA film; and removing the concave mold.