Patent ID: 6206768
Filing Date: 2001-03-27
Classification: B24B

Abstract:
A carrier head for chemical mechanical polishing comprising:a carrier to press a wafer against a polishing pad containing a polishing slurry;a guide ring placed in a concentric groove or notch in said carrier to hold said wafer beneath said carrier;a plurality of adjusting screws threaded into said carrier;a locking nut attached to each of said adjusting screws positioned above said carrier;a backing plate attached to the upper surface of said guide ring, wherein there is a gap between the upper surface of said backing plate and the lower surface of said carrier; anda plurality of holding screws with the threaded end pointing upwards through said backing plate, wherein each of said holding screws is threaded into one of said adjusting screws, wherein the height of said gap is controlled by said adjusting screws.