Multistage spin type substrate processing system

A multistage spin type substrate processing system comprising:

• a multistage spin unit having at least three compartments stacked vertically in a multistage;
• a main arm mechanism comprising a holder for holding a processed substrate to put the processed substrate in and out of each of the compartments, and driving means for causing the holder to advance and retreat longitudinally, moving the holder up and down along a vertical shaft and turning the holder around the vertical shaft;
• a spin chuck provided on each of the compartments for holding and spin-rotating the substrate delivered by the main arm mechanism;
• a cup for surrounding the spin chuck to receive and discharge a treatment solution separated from the substrate by centrifugal force;
• a common nozzle for supplying the treatment solution toward the substrate held by the spin chuck in the compartment;
• a vertical nozzle moving passageway provided along the multistage spin unit for communicating with each of the compartments to move the common nozzle therethrough;
• a nozzle moving mechanism for moving the common nozzle in a vertical direction in the nozzle moving passageway;
• a clean air introducing mechanism provided in an upper portion of each of the compartments for introducing clean air into each of the compartments;
• a dividing member having an opening for letting the common nozzle in and out, and dividing the nozzle moving passageway from the compartment;
• and
• an exhaust mechanism for exhausting the nozzle moving passageway.