Patent ID: 8081292

Claim:
An exposure system for projecting a pattern formed on a reticle mounted on a reticle stage through a projection lens onto a substrate where a photosensitive resin film is formed, the substrate mounted on a wafer stage, comprising: a spatial image mark body having a plurality of spatial image marks arranged in a same plane and placed between an exposure light source for irradiating an exposure light and the projection lens; a spatial image projection plate having a main surface that slants with respect to a substrate mounting surface of the wafer stage, and where the plurality of spatial image marks is simultaneously projected through the projection lens; and a plurality of detectors simultaneously detecting optical intensities of the images of the plurality of spatial image marks projected onto the spatial image projection plate, respectively, and wherein the spatial image projection plate has openings corresponding to each projection position of the images of spatial image marks projected onto the spatial image projection plate at the time that the exposure light enters the spatial image mark body, each opening is arranged in a different position in an optical axis direction of the exposure light and the exposure light passed through each opening is led to each of the detectors.