Single and multi-strength spectacle lenses producing method for patient, involves controlling spindle such that speed of translatory relative movement at individual surface elements of surface is high corresponding to material removal

摘要

#CMT# #/CMT# The method involves clamping a lens blank (2) at an outer end and pressing the blank in a standard ring (1). The blank is pressed against a rotating processing tool and is provided in the form of discs. Translatory relative movement between the tool and a lens upper surface (9) of the blank in a plane perpendicular to a workpiece spindle are implemented. The spindle is controlled by a computer numerical controlled (CNC) machine such that speed of the movement at surface elements of the surface is high corresponding to material removal to producing desired lens geometry. #CMT# : #/CMT# An independent claim is also included for a device for performing a single and multi-strength spectacle lenses producing method, comprising a computer numerical controlled machine. #CMT#USE : #/CMT# Method for single and multi-strength ophthalmic lenses for an eye of a patient according to general or individual prescription. #CMT#ADVANTAGE : #/CMT# The method eliminates the need for enlargement of diameter of the blank for clamping purpose and for stabilizing the edge of lens with material and increases accuracy and efficiency of the production of the ophthalmic lenses, thus achieving material saving and enabling cost-effective and environment-friendly production of the lens with improved quality. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows an enlarged sectional view and a top view of a standard ring with a lens blank. 1 : Standard ring 2 : Lens blank 3 : O-ring 4 : V-groove 7 : Stop unit 9 : Lens upper surface.