Patent ID: 6048258
Filing Date: 2000-04-11
Classification: B24B

Abstract:
A lens grinding apparatus for grinding a lens such that it conforms to the shape of an eyeglass frame, said apparatus comprising:frame configuration data input means for entering data on the configuration of the eyeglass frame;layout data input means for entering data to be used in providing a layout of the lens corresponding to the eyeglass frame;lens rotating shafts holding the lens therebetween to rotate it about a first axis,at least one abrasive wheel rotating shaft having a finishing abrasive wheel and a polishing abrasive wheel, the polishing abrasive wheel having at least a partially cylindrical surface;a computing unit which obtains a finishing processing path locus on the basis of the data inputted by the frame configuration data input means and the layout data input means and adds a correction amount to an amount of polishing processing uniform in a direction of a normal line to the finishing processing path locus to cancel an error generated due to a mechanical strength of the lens rotating shafts, the correction amount increasing as a processing point by the polishing abrasive wheel is located farther from a linear line connecting an axis of the abrasive wheel rotating shaft to the first axis; andprocessing control means for controlling the processing of the lens based on the result of calculation by the computing unit.