Patent ID: 6648743
Filing Date: 2003-11-18
Classification: B24B

Abstract:
A polishing pad for use in chemical mechanical polishing of a substrate, the polishing pad comprising a substantially flat disk having a polishing surface for contacting the substrate, the polishing surface having a central region and a peripheral region, the polishing surface segmented by a first set of substantially parallel linear grooves directed in a first direction and a second set of substantially parallel linear grooves directed in a second direction that is different from the first direction,the first set of substantially parallel linear grooves comprising:first central grooves having first central groove dimensions including a first central groove width and pitch, the first central grooves traversing the central region of the polishing surface, and first peripheral grooves having first peripheral groove dimensions including a first peripheral groove width and pitch, the first peripheral grooves traversing the peripheral region of the polishing surface, where at least one of the first central groove dimensions is different from a corresponding first peripheral groove dimension, and the second set of substantially parallel linear grooves comprising:second central grooves having second central groove dimensions including a second central groove width and pitch, the second central grooves traversing the central region of the polishing surface, and second peripheral grooves having second peripheral groove dimensions including a second peripheral groove width and pitch, the second peripheral grooves traversing the peripheral region of the polishing surface, where at least one of the second central groove dimensions is different from a corresponding second peripheral groove dimension, where each of the grooves completely crosses the polishing pad and has a uniform width.