METHOD FOR CUTTING A PATCH TO BE APPLIED ONTO A CURVED SUBSTRATE
The invention relates to a method for cutting a patch to be applied onto a curved substrate (20) that includes the preliminary calculation of curvilinear lengths (I1, I2, I3,...) on the substrate between a reference point (O) and a peripheral edge (B) of said substrate. The calculated lengths are applied to a planar film for making the patch, and then the patch is cut by connecting the ends (C1, C2, C3,...) of the applied lengths. The patch then precisely coincides with the edge of the substrate. Such a method is particularly useful for applying a functional film onto a spectacle lens, as a trimming of the lens after the film is assembled with the lens would degrade said film.