Method for polishing an optical lens

Abstract

A method of polishing a surface of an optical lens intended to be mounted in a spectacle frame includes: obtaining edging contour data representative of the edging contour of the optical lens so as to be mounted in the spectacle frame; and determining polishing tool trajectory data corresponding to the trajectory of a polishing tool so as to polish the surface of the optical lens only within the edging contour; providing the polishing tool trajectory data to a CNC machine carrying a polishing tool; and polishing, via the polishing tool, the surface of the optical lens based on the polishing tool trajectory data.

1 . Method of polishing a surface of an optical lens intended to be mounted in a spectacle frame, wherein the method comprises:
 obtaining edging contour data representative of the edging contour of the optical lens so as to be mounted in the spectacle frame, and   determining polishing tool trajectory data corresponding to the trajectory of a polishing tool so as to polish the surface of the optical lens only within the edging contour,   providing the polishing tool trajectory data to a CNC machine carrying a polishing tool, and   polishing, via the polishing tool, the surface of the optical lens based on the polishing tool trajectory data.   
     
     
         2 . The method according to  claim 1 , wherein the optical lens is intended to be worn by a wearer and the edging contour is determined based on the spectacle frame shape and wearer parameter data. 
     
     
         3 . The method according to  claim 2 , wherein the wearer parameter data comprises at least data representative of the inter-pupillary distance of the wearer. 
     
     
         4 . The method according to  claim 1 , wherein the polishing tool is selected so as to provide an abrasive surface on the optical lens smaller or equal to 320 mm 2 . 
     
     
         5 . The method according to  claim 1 , wherein the polishing tool and/or the optical lens to be polished are configured so as to move during the polishing of the surface within the edging contour. 
     
     
         6 . The method according to  claim 1 , wherein the polishing tool comprises at least a nozzle projecting a jet of an abrasive liquid on the surface to be polished. 
     
     
         7 . The method according to  claim 5 , wherein the nozzle has a characteristic dimension a diameter, greater than or equal to 0.1 mm and smaller than or equal to 2 mm. 
     
     
         8 . The method according to  claim 1 , wherein the polishing tool comprises a mechanical tool carrying a polishing pad configured to be in contact with the surface to be polished and having a characteristic dimension, for example a diameter, smaller than or equal to 10 mm. 
     
     
         9 . The method according to  claim 8 , wherein the polishing pad is bent, arched or curved. 
     
     
         10 . The method according to  claim 8 , wherein the pad is made of an elastic material. 
     
     
         11 . The method according to  claim 1 , wherein the polishing tool comprises a laser or plasma. 
     
     
         12 . The method according to  claim 1 , wherein the method further comprises after polishing the surface of the optical lens:
 measuring the rugosity of the polished surface,   re-polishing at least part of the surface of the optical lens within the edging contour when the measured rugosity is greater than a threshold.   
     
     
         13 . The method according to  claim 1 , wherein the method further comprises prior to polishing the surface of the optical lens measuring surfacing error over at least part of the surface of the optical lens within the edging contour by measuring at least part of the surfaced surface of the optical lens within the edging contour and comparing such measured surfaced surface with a surface of reference and the polishing tool trajectory data is determined at least based on the measured surfacing error. 
     
     
         14 . A non-transitory computer-readable medium on which is stored one or more sequences of instructions that are accessible to a processor and which, when executed by the processor, causes the processor to carry out the method of  claim 1 . 
     
     
         15 . (canceled) 
     
     
         16 . The method according to  claim 5 , wherein the nozzle has a characteristic dimension a diameter, greater than or equal to 0.1 mm and smaller than or equal to 1 mm.