Patent ID: 7458879
Filing Date: 2008-12-02
Classification: B24B

Abstract:
1. A dressing apparatus for dressing a polishing surface of a polishing table for polishing a surface of a substrate, said dressing apparatus comprising: a dresser body; a dresser plate disposed vertically movably with respect to said dresser body; a dressing member supported by said dresser plate; a hermetically sealed chamber between said dresser body and said dresser plate, at least part of said hermetically sealed chamber being defined by an elastic membrane; a fluid supply source for supplying a fluid under a positive pressure or a negative pressure to said hermetically sealed chamber to control a dressing load; and a fluid passage interconnecting said hermetically sealed chamber and said fluid supply source, wherein said hermetically sealed chamber is defined by said elastic member comprising a tubular resilient membrane and a disk-shaped plate mounted on an end of said tubular resilient membrane, said disk-shaped plate having a constant pressure-bearing area for applying the positive pressure or the negative pressure of the fluid.