Method for machining an optical surface of an optical lens

Abstract

Method for machining an optical surface of an optical lens, including: a lens blank providing step, during which a lens blank blocked on a lens blocker is provided; a clamping step, during which the lens blocker is clamped in a lens machining device; a tilting step, during which the lens blank and lens blocker are tilted relative to the rotation axis of the lens machining device; a surface position determining step, during which the position of the surface to be machined is determined based on the tilt angle of the lens blank and lens blocker relative to the rotation axis of the lens machining device; and a machining tool configuration step, during which the operational parameters of the lens machining tool are configured to manufacture the surface to be manufactured according to the determined surface position so the desired optical properties of the optical lens are respected.

1 . Method for machining an optical surface of an optical lens, the method comprising:
 a lens blank providing step, during which a lens blank blocked on a lens blocker is provided,   a clamping step, during which the lens blocker holding the lens blank is clamped in a lens machining device,   a tilting step, during which the lens blank and lens blocker are tilted relative to the rotation axis of the lens machining device,   a surface position determining step, during which the position of the surface to be machined is determined based on the tilt angle of the lens blank and lens blocker relative to the rotation axis of the lens machining device,   a machining tool configuration step, during which the operational parameters of the lens machining tool are configured in order to manufacture the surface to be manufactured according to the determined surface position so that the desired optical properties of the optical lens are respected.   
     
     
         2 . The method according to  claim 1 , wherein during the surface position determining step the position of the surface to be machined is determined so that the angle α between the normal of the surface to be machined at the rotation axis of the lens machining device and the rotation axis of the lens machining device is smaller than or equal to 3°. 
     
     
         3 . The method according to  claim 1 , wherein during the surface position determining step the position of the surface to be machined is determined so that the normal of the surface to be machined at the rotation axis of the lens machining device is co-linear with the rotation axis of the lens machining device. 
     
     
         4 . The method according to  claim 1 , wherein during the tilting step the lens blank and lens blocker are tilted of an angle β with the rotation axis of the lens machining device smaller than or equal to 3°. 
     
     
         5 . The method according to  claim 1 , wherein the method further comprises a weight distribution determining step during which a weight distribution of the lens blank and lens blocker around the rotation axis of the lens machining device is determined based on the tilt of the lens blank and lens blocker. 
     
     
         6 . The method according to  claim 1 , wherein during the tilting step the lens blank and lens blocker are tilted so that the angle α between the normal of the surface to be machined at the rotation axis of the lens machining device and the rotation axis of the lens machining device is as small as possible. 
     
     
         7 . The method according to  claim 1 , wherein during the tilting step the lens blank and lens blocker are tilted of an angle β determined so as the difference with the angle α between the normal of the surface to be machined at the rotation axis of the lens machining device and the rotation axis of the lens machining device is as small as possible. 
     
     
         8 . The method according to  claim 1 , wherein the clamping and tilting steps are carried out simultaneously by having the clamping device of the machining device with a predetermined tilt relative to the rotation axis of the lens machining device. 
     
     
         9 . The method according to  claim 1 , further comprising a surface machining step during which the surface of the optical lens blank to be machined is machined based on the operational parameters of the lens machining tool configured during the machining tool configuration step. 
     
     
         10 . Machining device for machining the optical surface of an optical lens, the machining device comprising:
 a clamp configure to clamp a lens blocker with a tilt angle relative to the rotation axis of the lens machining device, and   a processor for
 determining the position of the surface to be machined based on the tilt angle of the lens blank and lens blocker relative to the rotation axis of the lens machining device, and 
 configuring the operational parameters of the lens machining tool in order to manufacture the surface to be manufactured according to the determined surface position so that the desired optical properties of the optical lens are respected. 
   
     
     
         11 . The machining device according to  claim 10 , wherein the clamp has a predetermined tilt angle relative to the rotation axis of the lens machining device. 
     
     
         12 . The machining device according to  claim 10 , wherein the clamp is configured to tilt the lens blank and lens blocker with an angle β smaller than or equal to 3°. 
     
     
         13 . The machining device according to  claim 10 , wherein the processor is further configured to determine a weight distribution of the lens blank and lens blocker around the rotation axis of the lens machining device based on the tilt of the lens blank and lens blocker. 
     
     
         14 . A non-transitory computer-readable medium on which is stored a computer program for a data processing device, the computer program comprising a set of instructions which, when loaded into the data processing device, causes the data processing device to perform at least the surface position and machining steps of the method of  claim 1 . 
     
     
         15 . (canceled) 
     
     
         16 . The method according to  claim 2 , wherein during the surface position determining step the position of the surface to be machined is determined so that the normal of the surface to be machined at the rotation axis of the lens machining device is co-linear with the rotation axis of the lens machining device. 
     
     
         17 . The method according to  claim 2 , wherein during the tilting step the lens blank and lens blocker are tilted of an angle β with the rotation axis of the lens machining device smaller than or equal to 3°. 
     
     
         18 . The method according to  claim 3 , wherein during the tilting step the lens blank and lens blocker are tilted of an angle β with the rotation axis of the lens machining device smaller than or equal to 3°. 
     
     
         19 . The method according to  claim 2 , wherein the method further comprises a weight distribution determining step during which a weight distribution of the lens blank and lens blocker around the rotation axis of the lens machining device is determined based on the tilt of the lens blank and lens blocker. 
     
     
         20 . The method according to  claim 3 , wherein the method further comprises a weight distribution determining step during which a weight distribution of the lens blank and lens blocker around the rotation axis of the lens machining device is determined based on the tilt of the lens blank and lens blocker. 
     
     
         21 . The method according to  claim 4 , wherein the method further comprises a weight distribution determining step during which a weight distribution of the lens blank and lens blocker around the rotation axis of the lens machining device is determined based on the tilt of the lens blank and lens blocker.