Patent ID: 7866058

Claim:
A spin head, comprising: a rotatable support plate; first chucking pins and second chucking pins installed on a top surface of the rotatable support plate to support an edge portion of a substrate and prevent the substrate loaded on the rotatable support plate from separating from the rotatable support plate when the rotatable support plate rotates; and a driving unit for selectively moving the first and second chucking pins in an outside radial direction of the rotatable support plate via a magnetic force such that the first and second chucking pins are not in contact with the edge portion of the substrate during a process, the driving unit includes: first follower parts each including a first magnet which is connected to the first chucking pins and travels with the first chucking pin in a radial inside direction of the support plate by the magnetic force; second follower parts each including a second magnet which is connected to the second chucking pins and traveling with the second chucking pin in a radial inside direction of the support plate by the magnetic force; a driving magnet disposed inside the first and second follower parts; and an elevating member for selectively applying a magnetic force to the first magnet disposed at a first height and the second magnet disposed at a second height to elevate the driving magnet.