Patent ID: 6488568
Filing Date: 2002-12-03
Classification: B24B,B24D

Abstract:
A system for planarizing the surface of a workpiece, wherein said system comprises a planarizing device including a process chamber which houses a rotating platen, the rotating platen having a surface and a center, a polishing pad disposed on the platen surface, the polishing pad having a polishing surface, a polishing head for holding the workpiece over the polishing pad, a platen drive spindle which rotates the platen about its center, said device further comprising:a recess in the platen located radially displaced from the center of the platen, said recess having a bottom surface within the platen; an aperture in the polishing pad, said aperture overlying the recess in the platen; a window pane secured within the aperture, said window pane having an upper surface co-planar with the polishing surface; and an optical fiber comprising a plurality of optical fiber bundles, said optical fiber communicating from an optical coupling, through the platen drive spindle, radially outward from the center of the platen, and terminating proximate to the recess of the platen.