Patent ID: 6048254
Filing Date: 2000-04-11
Classification: B24B

Abstract:
A process for lapping a surface comprising:a) providing a work piece to be lapped, having at least one surface to be lapped, which adjusted to a position parallel to a front surface of b) whereb) is a rotating platen having i) a back surface and ii) a front surface, wherein said front surface comprises a flat surface of said platen having openings therein through which air may flow,c) providing a sheet of abrasive material having an abrasive face and a back side, said back side being on said flat surface of said platen with the abrasive face of said sheet facing said at least one surface to be lapped,d) wherein said sheet sheet has an outer edge and an inner edge defining an annular distribution of abrasive, said inner edge having a diameter which is greater than one-third the diameter of said outer edge,(1) rotating said platen at a rotational speed of at least 500 revolutions per minute, and(2) contacting said abrasive face and said at least one surface to be lapped on said work piece.