Patent ID: 8382555

Claim:
A substrate supporting unit, comprising: a vacuum plate vacuum-absorbing a substrate; chuck members inserted into holes passing through the vacuum plate, the chuck members include supporting pins supporting a bottom surface of the substrate and chucking pins supporting a lateral surface of the substrate; and a driving member vertically moving the chuck members to support the substrate placed on the vacuum plate in a state where the substrate is spaced upwardly from the vacuum plate, the driving member includes: an upper magnet member coupled to the chuck members; a lower magnet member in which a magnetic pole thereof is oriented such that a magnetic repulsive force acts between the upper and lower magnet members, the lower magnet member being disposed below the upper magnet member to face each other; and a linear driving unit vertically moving the lower magnet member, wherein the upper magnet member includes a first upper magnet member coupled to the supporting pins and a second upper magnet member coupled to the chucking pins, and wherein the lower magnet member includes: a first lower magnet member in which a magnetic pole thereof is oriented such that a magnetic repulsive force acts between the first upper and lower magnet members, the first lower magnet member being disposed below the first upper magnet member; and a second lower magnet member in which a magnetic pole thereof is oriented such that a magnetic repulsive force acts between the second upper and lower magnet members, the second lower magnet member being disposed below the second upper magnet member, and wherein the linear driving unit includes: a first linear driving unit vertically moving the first lower magnet member; and a second linear driving unit vertically moving the second lower magnet member.