Patent ID: 9676076
Date: 2017-06-13
CPC Classifications: B24B

Claim:
1. A polishing apparatus for polishing a film formed on a substrate by pressing the substrate against a polishing pad on a polishing table, comprising: a polishing pad measuring device configured to measure a thickness of the polishing pad used for polishing; a modulus of elasticity measuring device configured to measure a modulus of elasticity of the polishing pad; a memory unit configured to store the thickness of the polishing pad, measured by the polishing pad measuring device and to store the modulus of elasticity of the polishing pad; a storage unit configured to store an algorithm for correction of polishing time, wherein the algorithm is prepared based on the combination of: a known thickness value, a known modulus of elasticity of the polishing pad value, a polishing time required to polish a predetermined polishing amount of the substrate by the polishing pad having the known thickness value and the known modulus of elasticity of the polishing pad value, and the predetermined polishing amount, or the known thickness value, the known modulus of elasticity of the polishing pad value, a polishing amount obtained when the substrate is polished by a predetermined polishing time by the polishing pad having the known thickness value and the known modulus of elasticity of the polishing pad value, and the predetermined polishing time; and a calculation unit configured to calculate an optimal polishing time for a polishing target value, wherein the optimal polishing time for the polishing target value is calculated based on the combination of: a current thickness of the polishing pad measured by the polishing pad measuring device,