Method for making an ophthalmic lens surface, installation...

B - Operations – Transporting – 24 – B

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B24B 13/00 (2006.01) B23P 23/02 (2006.01) B23Q 5/027 (2006.01) B24B 1/00 (2006.01)

Patent

CA 2373148

The invention concerns a method for making an ophthalmic lens surface. It comprises steps which consist in: a) machining the surface by material removal by moving a cutting tool along a continuous path to produce grooves, two adjacent grooves being spaced by a constant pitch ranging between 0.01 and 3 mm, and b) smoothing the machined surface by moving a smoothing tool along a continuous path consisting of runs, two adjacent runs being spaced by a constant pitch ranging between 0.2 and 3 mm, to produce a pass band filtering for the undulations of said surface between a low frequency corresponding to a surface envelope to be achieved and a high frequency corresponding to a base roughness.

L'invention concerne un procédé de fabrication d'une surface d'une lentille ophtalmique. Selon l'invention, il comprend une étape a) d'usinage de la surface par enlèvement de matière en déplaçant un outil de coupe selon une trajectoire continue pour former des sillons, deux sillons adjacents étant espacés d'un pas constant compris entre 0,01 et 3 mm, et une étape b) de lissage de la surface usinée en déplaçant un outil de lissage selon une trajectoire continue formée de courses, deux courses adjacentes étant espacées d'un pas constant compris entre 0,2 et 3 mm, pour réaliser un filtrage passe-bande des ondulations de cette surface entre une fréquence basse correspondant à une enveloppe de surface à atteindre et une fréquence haute correspondant à une rugosité de fond. Image

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