Patent ID: 6095896
Filing Date: 2000-08-01
Classification: B24B

Abstract:
An eyeglass lens grinding machine for processing a lens so that the lens fits in an eyeglass frame, said machine comprising:data input means for entering frame configurational data on the eyeglass frame and layout data to be used in providing a layout of the lens relative to the eyeglass frame;an edge position detecting means for detecting an edge position of the lens after processing on the basis of the frame data and the layout data entered by said data input means;first bevel path determining means for determining a first bevel path by calculation based on the result of detection by said edge position detecting means;second bevel path determining means for determining a second bevel path based on said first bevel path such that said second bevel path passes through a desired position on a lens edge, and said second bevel path is located on a second spherical surface obtained by offsetting a center of a first spherical surface, wherein if the first bevel path is located on a spherical surface, the spherical surface is identical to the first spherical surface, and if the first bevel path is not located on a spherical surface, a spherical surface is approximated, and the approximated spherical surface is used as the first spherical surface; andprocessing control means for controlling bevelling of the lens on the basis of said first bevel path or said second bevel path.