Process of determination of a semi-finished blank

US9784991B2 · kind B2 · utility

Assignee

• Essilor International (Compagnie Generale d'Optique) · FR

Inventors

• Jean SAHLER · Charenton-le-Pont, FR
• Agnes Ladous · Charenton-le-Pont, FR
• Bruno Amir · Charenton-le-Pont, FR

Key dates

• Filing date: Nov 9, 2012
• Grant date: Oct 10, 2017
• Expiry date: Mar 18, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C2202/08
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A method for determining a semi-finished lens blank, including the steps of: determining, for a given material, a set of faces (S1, S2, . . . Sn) to be defined for a line of ophthalmic lenses, each face (Si, Sj) being defined for a corresponding subset (SEi, SEj) of wearer data and/or frame data; determining, for each face (Si, Sj), a minimum thickness requirement (EnvSi, EnvSj) necessary to produce all the lenses of the corresponding subset (SEi, SEj); determining combinations of two faces (Si, Sj) to be paired; defining a “double-faced” semi-finished lens blank (SF(ij)) consisting of two paired defined faces (Si and Sj) and including the minimum thickness requirements (EnvSi and EnvSj) respectively determined for the faces, in a manner that allows producing all the lenses of the subsets (SEi and SEj) corresponding to said faces.