Patent ID: 6783445
Filing Date: 2004-08-31
Classification: B24B

Abstract:
A polishing apparatus comprising:a polishing table having a polishing surface thereon; a top ring for pressing a workpiece to be polished against said polishing surface; and a dresser for dressing said polishing surface on the polishing table, said dresser including (i) a shaft to rotate said dresser about an axis passing through said dresser, (ii) a dressing element provided on a surface of said dresser for dressing said polishing surface by sliding contact with said polishing surface, and (iii) an ejection nozzle provided on the surface of said dresser for ejecting a fluid toward said polishing surface, said ejection nozzle being directed toward an outer circumferential edge of said dresser so as to eject the fluid toward the outer circumferential edge of said dresser, wherein said dressing element has a fluid flow hole defined therethrough for flowing the fluid to a lower surface of said dressing element, and a fluid ejection slot defined in the lower surface of said dressing element, and wherein said fluid ejection slot is extended from said fluid flow hole to an outer circumferential edge of said dressing element.