Patent ID: 6749491
Filing Date: 2004-06-15
Classification: B24B

Abstract:
In a chemical mechanical planarization (CMP) system, an apparatus for reducing non-uniform stretch of a belt used in the CMP system, the belt extending between a first roller and a second roller to define a belt loop to be used for CMP, the belt loop having an inner surface and an outer surface, the apparatus comprising:a compensating roller having a first end and a second end, the first end and second end extending a width of the belt, the first end and the second end having a first diameter and a center of the roller having a second diameter that is less than the first diameter, the compensating roller having a symmetrically tapered shape extending between each of the first end and second end to the center; wherein the compensating roller is positioned inside of the belt loop, and is configured to be applied to the inner surface of the belt loop so as to reduce non-uniform stretch of the belt.