Patent ID: 8398811
Filing Date: 2013-03-19
Classification: B24B,H01L

Abstract:
1. A polishing apparatus comprising: a polishing section configured to polish a substrate having a plurality of laminated films including an upper layer and a lower layer; a measurement section configured to measure a thickness of a film formed on the substrate; an interface configured to input a desired thickness of a film formed on a substrate to be polished; and an arithmetic unit operable to calculate a polishing rate for the lower layer and to set an additional polishing time based on the calculated polishing rate for the lower layer, the polishing rate being calculated based on a ratio of polishing rates for the upper layer and the lower layer, and based on one of: (i) a relationship between an amount of polished film and a polishing time when the upper layer and a part of the lower layer have been polished; and (ii) a relationship between an amount of polished film and a polishing time when the upper layer has been polished, and to set an additional polishing time based on the calculated polishing rate for the lower layer.