Patent ID: 6494768
Filing Date: 2002-12-17
Classification: B24B,H01L

Abstract:
A wafer polishing apparatus comprising an index unit for delivering a wafer from a cassette to a load/unload unit, the apparatus comprising an upper transfer robot and a lower transfer robot, said load/unload unit relaying said wafer from said index unit to a polishing unit adjacent to said load/unload unit, and from said polishing unit to a washing unit, wherein said polishing unit polishes said wafer and wherein said washing unit washes said wafer after it is polished, wherein said polishing unit comprises three platens arranged in line and two waiting units each having a wafer placement table having an upper stage and lower stage structure arranged between respective pairs of adjacent platens, and injection ports for jetting washing fluid for washing said wafer moved by a polishing head, the injection ports being disposed between said platens and said waiting units, wherein said wafer is polished by one of said platens and is further polished by the other of said platens having different polishing characteristics.