Patent ID: 9057823
Filing Date: 2015-06-16
Classification: B29C,B29D,G02B

Abstract:
1. A method of making a lens, the method comprising the steps of: preheating a laminated film comprising an outer layer of cellulose triacetate (CTA), an intermediate layer of polyvinyl alcohol (PVA), and an outer layer of polycarbonate (PC), with different temperatures for the outer layers of the laminated film; thermoforming the laminated film while heating the outer layers differently; placing the thermoformed film in a mold having the shape of the lens in such a manner that the cellulose triacetate outer layer extends against a wall of the mold; injecting polycarbonate into the mold in such a manner that the layer of polycarbonate fuses with the injected polycarbonate to form the mechanical support layer of the lens; and unmolding the lens as formed in this way.