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Method and device for producing ophthalmic lenses and other shaped bodies with optically active surfaces

  • US 20060073771A1
  • Filed: 09/12/2005
  • Published: 04/06/2006
  • Est. Priority Date: 03/11/2003
  • Status: Active Grant
First Claim
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1. Method for producing ophthalmic lenses and other shaped bodies having optically active surfaces according to a general or individual prescription, including the use of plastic blanks in the form of flat, round discs of any surface geometry and including the application of manufacturing techniques with mechanical material removal (milling, turning, grinding, smoothing, polishing, etc), characterised in that the plastic blanks (1) used are clamped (externally or internally) at their outer edge and the desired final surface geometry and surface quality of the convex front face (19) and concave rear face (27) of the lens are produced by machining using milling and/or lathe tools as well as by smoothing and, if applicable, polishing, with an annular region (30) of larger thickness (33) being retained at the outer circumference of the workpiece (16), and the annular region (30) serving to clamp or to handle the workpiece (16) during all processing and transport operations, and also with the annular region (30) supporting and mechanically stabilising the actual ophthalmic lens (32) or shaped body for further processing, in that markings and/or shapes are applied to the annular region (30) which serve for the identification of the processing axes, and in that very fine markings are applied to the surface of the actual ophthalmic lens (32) or shaped body which serve to characterise the axial position of the surface geometries produced, and that subsequently the ophthalmic lens (32) is separated from the annular region (30).

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