Patent ID: 6102788
Filing Date: 2000-08-15
Classification: B24B,H01L

Abstract:
A chemical mechanical polishing apparatus comprising:a stage having a wafer holding surface side;pressing holes provided in said stage;suctioning holes provided in said stage, said suctioning holes being arranged close to an outer peripheral edge of said stage compared to said pressing holes;a pump connected to a cavity which is connected to said pressing holes and said suctioning holes at a side of said wafer opposite to said holding surface side;first filters provided in a gas passage of said pressing holes and having a higher gas flow capacity in a direction from said cavity to said wafer holding surface than a gas flow capacity in a direction opposite to that; andsecond filters provided in a gas passage within said suctioning holes and having a higher gas flow capacity in a direction from said wafer holding surface to said cavity than a gas flow capacity in a direction opposite to that.