Patent ID: 6485358
Filing Date: 2002-11-26
Classification: B24B

Abstract:
A wafer polishing device which polishes a wafer by pressing the wafer against a rotating polishing pad, the wafer polishing device comprising:a wafer holding head having a head body which holds the wafer; a retainer ring attached to the head body, the wafer being surrounded by the retainer ring; a ring-shaped retainer ring attaching part which is provided on the head body, the retainer ring being connected to a lower part of the retainer ring attaching part; an upper depression part formed on an outer periphery of the retainer ring attaching part; a lower depression part formed on an outer periphery of the retainer ring, the lower depression part having a rectangular shape with a base wall and a pair of sidewalls which extend perpendicularly with respect to the base wall; and a snap ring which is detachably attached to an outer periphery of a joint of the retainer ring attaching part and the retainer ring and has an upper projection part and a lower projection part formed on an inner periphery, the upper projection part being fitted to the upper depression part, and the lower projection part having a rectangular shape which corresponds to the shape of the lower depression part so as to become fitted to the lower depression part.