Patent ID: 6093081
Filing Date: 2000-07-25
Classification: B24B,G01B,G05B,H01L

Abstract:
A polishing method of driving the surface of a layer provided on the surface of a substrate and polishing means relative to each other to polish the surface of said layer, said method comprising the steps of:setting a reference surface at a position sufficiently longer from the surface of said layer than the film thickness of said layer;illuminating first and second light beams differing in coherent distance from each other from light source means to said layer and said reference surface;individually detecting the reflected light beam from each surface based on said first light beam and the reflected light beam from each surface based on said second light beam by detecting means; andobtaining the surface information of said layer from a signal from said detecting means, and controlling the continuation or stoppage of the polishing of said layer on the basis of said surface information.