Patent ID: 11279005

Abstract:
Provided are a vacuum chuck member and a vacuum chuck method that are capable of suppressing misalignment of a substrate when a wafer having a significant deflection or warpage is chucked and held.In a state in which a wafer W is placed on the upper surface side of a base 1, the pressure in an inner space S1 surrounded by the upper surface of the base 1, the lower surface of the wafer W, and the inner side surface of an inner annular rib 21 is reduced through a first air passage 101. Subsequently, the pressure in an outer space S2 surrounded by the upper surface of the base 1, the lower surface of the wafer W, the outer side surface of the inner annular rib 21, and the inner side surface of an outer annular rib 22 is reduced through a second air passage 102.