Machining method by turning a face of a spectacle lens

摘要

A machining method for machining a surface of a spectacle lens at a fixed rotation speed, includes a step of determining the rotation speed from geometric characteristics of the surface, characterized in that the step of determining the rotation speed includes the following steps: a value (Maxdiff) representative of the largest difference in geometric value of the mean sphere on the surface is determined; and the rotation speed is deduced from the value (Maxdiff) of the largest difference in geometric values of the mean sphere on the surface and from a geometric value of the cylinder (FV torus) at a predetermined far-vision control point.

主权项

1. A machining method comprising:
determining a fixed rotational speed (Vrot) from geometric characteristics (x, y, z) of a surface (12) of a spectacle lens, according to the following steps: determining (102) a value (Maxdiff) representative of a greatest difference of mean sphere geometric values (Sph) on said surface (12); and deducing (107) the fixed rotational speed (Vrot) from said value (Maxdiff) of the greatest difference of mean sphere geometric values (Sph) on said surface (12) and from a cylinder geometric value (FV torus) at a predetermined far-vision control point; and turning the surface of the spectacle lens with a turning machine at the fixed rotational speed.