Patent ID: 6077155
Filing Date: 2000-06-20
Classification: B24B

Abstract:
In an improved polishing device including a polishing plate having an upper surface on which a polishing pad is attached, and a plurality of polishing heads each having a lower surface opposed to an upper surface of said polishing pad on said polishing plate, for holding a plurality of substrates to be polished on said lower surface, whereby said substrates held by said polishing heads are pressed against said upper surface of said polishing pad to perform polishing of said substrates, the improvement comprising:a plurality of dressers provided with said plurality of polishing heads, wherein at least one of said plurality of dressers corresponds to and is integrated with at least one of said plurality of said polishing heads, whereby said upper surface of said polishing pad can be dressed by said plurality of dressers concurrently with the polishing of said substrates by said plurality of said polishing heads; anda plurality of extension coil springs for normally biasing each of said dressers to the corresponding polishing head.