Patent ID: 8007218

Claim:
A method of treating substrates, comprising: treating a substrate by means of a substrate treating apparatus including a transfer chamber; supporting members disposed at one side of the transfer chamber, on which a substrate is placed; a loadlock chamber disposed at the other side of the transfer chamber; and a transfer unit provided at the transfer chamber to transfer substrates between the loadlock chamber and the supporting members, wherein substrates are placed inside the loadlock chamber to be vertically spaced apart from each other, and substrates are placed on the supporting members to be arranged abreast in a lateral direction, wherein the transfer unit comprises a top blade and a bottom blade converted to a folded state where they vertically face each other and an unfolded state where they rotate at a preset angle in opposite directions, wherein the transfer unit puts/takes two substrates into/out of the loadlock chamber at the same time under the folded state and puts/takes two substrates onto/out of the supporting members at the same time under the unfolded state, and wherein the top blade and the bottom blade are vertically spaced at a constant interval; wherein the top blade and the bottom blade include rotation shafts arranged at middle portions thereof about which the top blade and the bottom blade rotate so as to be in a folded or an unfolded position; wherein the rotation shaft of the top blade and the rotation shaft of the bottom blade enclose a same axis of rotation about which the top blade and the bottom blade rotate.