Patent ID: 7108581
Filing Date: 2006-09-19
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; a fluid passage interconnecting said hermetically sealed chamber and said fluid supply source; and a measuring device in said fluid passage for measuring a flow rate in said fluid passage so as to detect a leakage of fluid from said hermetically sealed chamber.