Method for cutting-out a multi-layer ophthalmic lens

US9475166B2 · kind B2 · utility

Assignee

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

Inventors

• Muriel Godeau · Charenton-le-Pont, FR
• Aude Lapprand · Charenton-le-Pont, FR
• Cedric Lemaire · Montivilliers, FR
• Christian Massart · Clichy-sous-Bois, FR
• Gilles Massey · Charenton-le-Pont, FR
• Sébastien Pinault · Charenton-le-Pont, FR
• Catherine Roussel · Charenton-le-Pont, FR
• Montserrat Burgos · Charenton-le-Pont, FR

Key dates

• Filing date: May 3, 2013
• Grant date: Oct 25, 2016
• Expiry date: Aug 7, 2033

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B24D3/00
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

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.