Method For Producing Polarizing Lenses, And Polarizing Lens Obtained By Said Method

摘要

The invention relates to a polarizing lens consisting, in order, of a polyamide mechanical substrate, a polyvinyl alcohol intermediate layer, and a cellulose triacetate outer layer. The invention also relates to a method for manufacturing such a lens.

主权项

1. A process for producing a lens, comprising:
preheating a laminated film, comprising first and second outer layers with the first outer layer having first and second opposing surfaces and comprising cellulose triacetate (CTA), an intermediate layer having first and second opposing surfaces and comprising polyvinyl alcohol (PVA), wherein the first surface of the intermediate layer is disposed over the second surface of the first outer layer and the second outer layer has first and second opposing surfaces and is comprised of polyamide, wherein the first surface of the second outer layer is disposed over the second surface of the intermediate layer, and wherein preheating the laminated film comprises preheating the first outer layer to a first temperature and preheating the second outer layer to a second, different temperature; thermoforming the preheated laminated film, wherein the first outer layer is heated at a third temperature and the second outer later is heated at a fourth, difference temperature; disposing the thermoformed film in a lens-shaped mold having at least first and second opposing surfaces, wherein the first surface of the first outer layer of the laminated film is adapted to couple to the first surface of the lens-shaped mold; injecting polyamide into the lens-shaped mold such that the second outer layer couples with the injected polyamide to form a mechanical support layer of the lens; and decoupling the lens from the lens-shaped mold.