Patent ID: 6149506
Filing Date: 2000-11-21
Classification: B24B

Abstract:
A process for lapping a surface comprising:a) providing a work piece to be lapped onto a workpiece support, said workpiece having a surface which is to be lapped,b) providing a rotating platen havingi) a back surface andii) front surface,c) providing an abrasive material on said front surface of said platen with the abrasive facing said surface of said workpiece which is to be lapped, andd) rotating said platen while said abrasive is in contact with said surface of said workpiece to be lapped, ande) supporting said workpiece on a workpiece support having a center of rotation and a support surface for said workpiece, said workpiece support comprising a spherical segment having a thickness along a radius passing through said center of rotation of the workpiece support which is less than the radius of a sphere defining the borders of the spherical segment, and said support surface has a surface area which is less than the surface area of the flat surface of a hemisphere cut from said sphere defining the borders of the spherical segment.