Patent ID: 7545480
Filing Date: 2009-06-09
Classification: G03F

Abstract:
1. An exposure apparatus comprising: a light source; a reticle, through which light radiated from the light source is transmitted, having a designed pattern formed thereon and having X-axis alignment marks and Y-axis alignment marks, the X-axis alignment marks having a plurality of segments formed at two or more positions on a substrate symmetrical about and equidistant from a substrate X-axis, the Y-axis alignment marks having a plurality of segments formed at two or more positions of the substrate symmetrical about and equidistant from a substrate Y-axis; an optical system, through which light radiated to the reticle is projected; a wafer stage for mounting a wafer onto which the designed pattern of the reticle projected through the optical system is imaged; a transmission image sensor installed at the wafer stage to detect the alignment marks projected through the optical system, wherein the transmission image sensor comprises an X-axis transmission part having a plurality of segments spaced apart in the X-axis direction to selectively transmit the light projected through the optical system, and a Y-axis transmission part having a plurality of segments spaced apart in the Y-axis direction; and an alignment part for discriminating an alignment state of the alignment mark detected by the transmission image sensor to align the wafer stage.