Patent ID: 8578953

Claim:
A substrate cleaning apparatus for cleaning a back surface of a substrate, the apparatus comprising: a first substrate supporting portion configured to suctionally support the substrate at a first area of a back surface of the substrate, the back surface facing down; a second substrate supporting portion configured to support the substrate at a second area of the back surface of the substrate, the second area being separated from the first area; a cup configured to surround the substrate supported by one of the first substrate supporting portion and the second substrate supporting portion; a gas ejection portion having an enclosing member configured to enclose the second substrate supporting portion, the gas ejection portion including a plurality of ejection orifices arranged at an upper end thereof and configured to eject a gas toward the back surface of the substrate to dry an inside area enclosed by the enclosing member, including the second area of the back surface of the substrate; a cleaning liquid supplying portion provided outside the gas ejection portion and configured to supply cleaning liquid to the back surface of the substrate; a cleaning member provided outside the gas ejection portion and configured to contact or be pressed on a third area of the back surface of the substrate thereby to clean the third area when the substrate is supported by the first substrate supporting portion, the third area including the second area, and to contact or be pressed on a fourth area of the back surface of the substrate thereby to clean the fourth area when the substrate is supported by the second substrate supporting portion, the fourth area excluding the second area of the back surface; a cleaning member supporting portion extending in a horizontal direction and configured to support the cleaning member; a first driving mechanism configured to move the cleaning member in a direction perpendicular to the extending direction of the cleaning member supporting portion in a horizontal plane; and a second driving mechanism configured to move the first substrate supporting portion and the cup in horizontal and vertical directions while the first supporting portion supports the substrate, and to move the first substrate supporting portion in a direction parallel to the extending direction of the cleaning member supporting portion, the gas ejection portion is configured to dry the inside area, including the second area of the back surface of the substrate, by blowing off the cleaning liquid on the inside area, including the second area of the back surface of the substrate, by the ejected gas, and diameters of the gas ejection portion and the cleaning member are less than a radius of the substrate, and the cleaning member is configured to clean the back surface of the substrate while the second substrate supporting portion is supporting the back surface of the substrate at the second area.