Device and method for complete machining of lenses that are optically active on two sides

Abstract

A device for machining a lens which is optically active on two sides includes a cutting and milling unit and/or a polishing unit used to machine at least a first side of the lens. A re-clamping unit is used to re-clamp the lens for machining on a second side of the lens.

1 - 22 . (canceled)  
   
   
       23 . A device for machining a lens that is optically active on both a first lens side and a second lens side, the device comprising: 
 a machining element configured to machine the lens;    a first holding device for clamping the lens in a first position so as to enable the machining unit to machine the first side;    a re-clamping unit for re-clamping the lens from the first position to a second position so as to enable the machining unit to machine the second side;    a positioning element; and    a second holding device configured to support the lens via the positioning element in relation to an axial position of the lens.    
   
   
       24 . The device as recited in  claim 23 , wherein the machining element includes at least one of a cutting unit, a milling unit and a polishing unit.  
   
   
       25 . The device as recited in  claim 23 , wherein the second holding device is connected to the re-clamping unit.  
   
   
       26 . The device as recited in  claim 23 , wherein the positioning element has at least one reference, the reference indicating at least one of the first lens side, the second lens side and an alignment of the lens.  
   
   
       27 . The device as recited in  claim 23 , wherein the positioning element is configured as a reference surface aligned relative to an optical axis of at least one of the first lens side and the second lens side.  
   
   
       28 . The device as recited in  claim 23 , wherein the second holding device includes at least two holding parts, each holding part having a back stop associated with a reference surface.  
   
   
       29 . The device as recited in  claim 23 , further comprising a support part configured to be placed against the first lens side.  
   
   
       30 . The device as recited in  claim 29 , wherein the support part has a plastically and/or elastically deformable surface for placing against the first lens side, the deformable surface.  
   
   
       31 . The device as recited in  claim 30 , wherein the surface is hardenable.  
   
   
       32 . The device as recited in  claim 30 , wherein the surface includes at least one of a binder and a filler.  
   
   
       33 . The device as recited in  claim 23 , further comprising a marking device for signing and/or marking the lens.  
   
   
       34 . The device as recited in  claim 23 , further comprising a washing device for washing and/or rinsing the lens is provided.  
   
   
       35 . The device as recited in  claim 26 , wherein the reference surface is disposed at least one of orthogonally and parallel relative to an optical axis of one of the first lens side and the second lens side.  
   
   
       36 . A method for manufacturing a lens from a lens blank having a first unworked side and a second unworked side, the method comprising: 
 clamping the lens blank in a lens receptacle rotatable around a workpiece spindle axis;    machining the first unworked side so as to create a first optically active surface having a first optical axis essentially coinciding with the workpiece spindle axis;    creating a clamping shoulder having a cylindrical lateral surface and a ring-shaped bearing face, the clamping shoulder serving as a positioning element, wherein a positioning axis of the positioning element is defined by the lateral surface and the bearing face and is disposed in a position that is one of coinciding with the workpiece spindle axis, offset from the first optical axis and tilted with respect to the first optical axis;    removing the lens blank from the lens receptacle;    turning the lens blank and reclamping the lens blank into one of the lens receptacle and a further lens receptacle so that the positioning axis coincides with the workpiece spindle axis; and    machining the second unworked side so as to create a second optical surface having a second optical axis essentially coinciding with the workpiece spindle axis.    
   
   
       37 . A method for machining a lens having a first optically active lens side and a second optically active lens side, the method comprising: 
 holding the lens in a first position using a first holding device associated with the second lens side;    machining at least the first lens side with at least one of a cutting, milling and polishing unit, wherein the machining includes forming a positioning element having a reference indicating at least one of the first lens side and the second lens side;    grasping the lens using a second holding device and aligning the lens relative to the second holding device using the positioning element;    removing the lens from the first holding device after the grasping;    reclamping the lens from the first position to the second position so as to enable a machining of the second side; and    machining the second side of the lens using at least one of a cutting unit and a polishing unit.    
   
   
       38 . The method as recited in  claim 37 , wherein the reference is a reference surface and wherein the second holding device includes a plurality of holding parts for grasping the lens in a radial direction, the reference surface being disposed against at least one holding part.  
   
   
       39 . The method as recited in  claim 38 , wherein the plurality of holding parts each include a back stop and the reference surface is disposed against the back stop of the at least one holding part.  
   
   
       40 . The method as recited in  claim 37 , wherein the reference is a reference surface disposed one of perpendicular and parallel to an optical axis of the lens.  
   
   
       41 . The method as recited in  claim 36 , further comprising disposing a support part against the first side before the machining of the second unworked side.  
   
   
       42 . The method as recited in  claim 36 , further comprising placing at least one of a marking and a signature at one of the first side and the second side so as to aid in a subsequent alignment of the lens.  
   
   
       43 . The method as recited in  claim 36 , before the machining of the second unworked side, applying a protective layer on the first optical surface.  
   
   
       44 . The method as recited in  claim 43 , further comprising washing the first optical surface before applying the protective layer.  
   
   
       45 . The method as recited in  claim 43 , wherein the protective layer includes at least one of a protective film and a protective coating.  
   
   
       46 . The method as recited in  claim 36 , wherein after the machining of the first unworked side and before removing the lens from the lens receptacle, holding the lens using clamping jaws of a second holding device.  
   
   
       47 . The method as recited in  claim 43 , wherein the before or after applying the protective layer, machining the edge is machined so as to facilitate one of a later positioning of the lens and a later attachment of the lens onto an eyeglass frame.