Patent ID: 6537416
Filing Date: 2003-03-25
Classification: H01L

Abstract:
A wafer chuck for a module that processes semiconductor wafers, the wafer chuck comprising:at least one alignment member that assumes an alignment position when the chuck is rotating below an alignment speed, and assumes a non-alignment position when the chuck is rotating at or above the alignment speed, wherein the alignment member in the alignment position aligns the wafer by constraining the wafer at its edge and does not constrain the wafer in the non-alignment position; and at least one clamping member that assumes a non-clamping position when the chuck is rotating at or below a clamping speed, and assumes a clamping position when the chuck is rotating above the clamping speed, wherein the clamping member in the clamping position clamps the wafer by constraining the wafer at its edge and does not constrain the wafer in the non-clamping position.