Method for cutting-out a multi-layer ophthalmic lens

摘要

A method for cutting-out a multi-layer ophthalmic lens (100) following a desired contour (C3), includes: a step of pre-blanking the ophthalmic lens (100) using a preliminary tool (210; 223), according to a preliminary contour (C1, C1′); a step of blanking the ophthalmic lens (100) using a blanking wheel (210), following a blanking contour (C2, C3); and a step of finishing the ophthalmic lens (100) using a finishing tool (212). According to the invention, the preliminary contour (C1, C1′) is larger than the desired contour (C3), and the blanking wheel (210) used has a granulometry of between 0.1 and 0.5 mm and is controlled in relation to the ophthalmic lens (100) so as to apply a radial force of between 0.1 and 5 N to the ophthalmic lens (100) during the blanking step.

主权项

1. A process for trimming an ophthalmic lens along a desired outline, said ophthalmic lens comprising a substrate and at least one coating film that is made of a different material to that of the substrate and that covers a main face of the substrate, comprising:
a step of pre-roughing the ophthalmic lens by means of a preliminary tool, along a preliminary outline separate and deduced from said desired outline; a step of roughing the ophthalmic lens by means of a roughing abrasive wheel, along a roughing outline coincident with or enlarged relative to the desired outline; and a step of finishing the ophthalmic lens by means of a finishing tool, wherein said preliminary outline is enlarged relative to the desired outline and the roughing abrasive wheel used has a grain size between 0.1 millimeter and 0.5 millimeter and is pushed on said ophthalmic lens so as to apply, in said roughing step, a radial force between 0.1 Newton and 5 Newton to the ophthalmic lens.