Patent ID: 8133095
Filing Date: 2012-03-13
Classification: B24B

Abstract:
1. A method of shaping an ophthalmic lens ( 20 ), the method comprising machining the edge face ( 23 ) of the lens ( 20 ) by means of at least one rotary tool having an axis, the axes of the tool and of the lens being movable relative to each other in rotation about a blocking axis (C) and in translation, both radially and axially, these freedoms of movement being controlled so that the edge face ( 23 ) of the lens presents a generally profiled shape that includes an engagement ridge ( 24 ) suitable for engaging in a bezel ( 11 ) of a rim ( 14 ) of an eyeglass frame ( 10 ), and first and second margins ( 26 , 27 ) on either side of the engagement ridge ( 24 ); the method being characterized in that given a first longitudinal curve ( 28 ) of the first margin ( 26 ) and a second longitudinal curve ( 29 ) of the second margin ( 27 ), the edge face ( 23 ) of the lens ( 20 ) is machined in such a manner that, at each axial section (Si) of the lens ( 20 ), the traces (Q 2 i, Q 3 i) in said axial section (Si) of the first and second longitudinal curves ( 28 , 29 ) of the two margins ( 26 , 27 ) present respective first and second distances (T 1 i, T 2 i) from the blocking axis (C) of the lens ( 20 ), with the difference therebetween being a function, referred to as an “altitude difference function”, of the position of the plane (X) of the axial section (Si) under consideration along the edge face ( 23 ) of the lens ( 20 ), which function is not entirely uniform.