Patent ID: 8382554

Claim:
A substrate polishing apparatus comprising: a rotatable substrate supporting member on which a substrate is seated; a rotatable and swingable polishing unit configured to polish a top surface of the substrate seated on the substrate supporting member; the polishing unit including: a compressing part having a polishing pad and a bellows disposed above the polishing pad, wherein the compressing part is rotated about a center axis to polish the substrate and the bellows is configured to regulate a pressure at which the polishing pad compresses the substrate using air pressure; a swing arm connected to the compressing part configured to swing the compressing part; and a driving part disposed below the swing arm and configured to provide a rotation force to the compressing part to swing the swing arm; and a control unit configured for controlling the substrate supporting member and the polishing unit during a polishing process to adjust a value of a polishing variable for adjusting a polishing amount of the substrate according to a horizontal position of the polishing pad with respect to the substrate, the control unit being configured to control the driving part to adjust a rotation speed and a swing speed of the polishing pad and regulate the air pressure injected into the bellows to regulate a compressing pressure of the polishing pad, wherein the control unit is configured to divide the top surface of the substrate into a plurality of adjustment sections and adjust the polishing variable according to each of the adjustment sections during the polishing process.