Patent ID: 9446491
Filing Date: 2016-09-20
CPC Classification: B24B,B29D

Claim Text:
1. A method of shaping an ophthalmic eyeglass lens to have a desired outline corresponding to an outline of a frame in which the lens is to be mounted, the lens presenting two main curved optical working faces and comprising firstly a substrate made of a first material and presenting two main curved faces corresponding to the two main faces of the lens, and secondly at least one coating film made of a material distinct from that of said substrate, said coating film being previously secured on at least one of the main faces of the substrate, the method comprising the following steps: a) a step of forming the edge face of the coating film by cutting the lens by machining the lens with a first tool over at least the thickness of the coating film previously secured on the substrate this cutting defining internally a working central portion of the coating film that presents a reduced outline of smaller size than the desired outline, this reduced outline being closed and determined as a function of said desired outline so as to be included within said desired outline; b) a step of trimming the edge face of the substrate along said desired outline by machining by means of a second tool distinct from the first tool, without machining the working central portion of the coating film; and c) at least one subsequent step of finishing the edge face of the substrate by machining without machining the working central portion of the coating film.