Patent ID: 6331137
Filing Date: 2001-12-18
Classification: B24B,Y10S

Abstract:
A polishing pad arrangement, comprising a pad having a horizontal polishing surface and a plurality of openings that define a horizontal cross-sectional open area of the pad, the horizontal cross-sectional open area being taken across the pad in a horizontal plane that is substantially parallel to the horizontal polishing surface, each of the plurality of openings having a substantially consistent horizontal cross-section throughout the opening, at least a portion of the horizontal cross-sectional open area of the pad increasing as the distance from the horizontal polishing surface at which the horizontal cross-sectional open area is taken increases, and wherein the plurality of openings include X openings located at a first depth measured from the horizontal polishing surface, and Y openings located at a second depth measured from the horizontal polishing surface, the first depth being less than the second depth, wherein the X openings have a combined horizontal cross-sectional open area that is less than a combined horizontal cross-sectional open area of the Y openings.