Patent ID: 8027028
Filing Date: 2011-09-27
Classification: G03F

Abstract:
1. A precise positioning system for dual stage switching exposure, comprising: a base; two wafer stage positioning units disposed on the base, and each including a first X-direction guide bar and a second X-direction guide bar that are individually movable along a Y direction perpendicular to the X direction, the first and second X-direction guide bars of one wafer stage positioning unit being respectively alignable with the first and second X-direction guide bars of the other wafer stage positioning unit; a first wafer stage placed on the first X-direction guide bar of one wafer stage positioning unit, and, when the first X-direction guide bars of the two wafer stage positioning units are aligned, being movable to the other wafer stage positioning unit along the aligned first X-direction guide bars; and a second wafer stage placed on the second X-direction guide bar of the other wafer stage positioning unit, and, when the second X-direction guide bars of the two wafer stage positioning units are aligned, being movable to the one wafer stage positioning unit along the aligned second X-direction guide bars.