Patent ID: 8252369

Claim:
A process for coating at least one geometrically defined surface of an optical article's substrate, said surface forming a Fresnel lens, comprising: (a) providing a removable carrier made of a plastic material and having an internal surface and an external surface, said internal surface optionally bearing a stack of one or more coatings having an exposed surface; (b) providing an optical article comprising a substrate having at least one geometrically defined surface forming a Fresnel lens, wherein the difference between a base curvature of the substrate and a base curvature of the carrier ranges from −0.3 to 0.3; (c) depositing a curable coating composition onto either the at least one surface forming a Fresnel lens, the internal surface of the carrier, or the exposed surface of the coating stack borne by the carrier; (d) moving the carrier and the optical article relatively to each other to bring the deposited curable coating composition into contact with either the at least one surface forming a Fresnel lens, the internal surface of the carrier or the exposed surface of the coating stack borne by the carrier; (e) applying a pressure higher than or equal to 0.138 Bar onto the external surface of the carrier to spread out the curable coating composition so as to cover said at least one surface forming a Fresnel lens, wherein the ratio of the thickness of the carrier (in millimeters)/pressure applied (in Bar) is higher than or equal to 1.85; (f) curing the layer of curable coating composition; and (g) withdrawing the removable carrier to recover the substrate of the optical article having at least one Fresnel lens forming surface coated with the cured coating composition and optionally with the transferred coating stack.