Patent ID: 6210260
Filing Date: 2001-04-03
Classification: B24B,H01L

Abstract:
A carrier comprising:a disk-shaped body portion having fluid circulation holes;a pliable ring-shaped diaphragm portion expanding outward from the outer peripheral surface of said body portion;a ring-shaped portion projecting at least downward from an outer edge portion of said diaphragm portion and having an inner diameter of at least an outer diameter of a workpiece;a pliable double layer sheet having an outer peripheral portion on an upper surface thereof affixed air-tightly to a bottom end portion of said outer edge portion, the back surface of said pliable double layer sheet defining a single pressure chamber communicating with the fluid circulation holes, wherein said pliable double layer sheet is formed by a single hard sheet and soft sheet bonded together; anda ring-shaped member, for surrounding the workpiece, affixed to the bottom surface of said sheet.