Patent ID: 7916277

Claim:
An exposing apparatus, comprising: a mask stage; a supporter that supports the mask stage; a substrate below the mask stage; a substrate chuck that supports the substrate; a substrate chuck moving mechanism that moves the substrate chuck; three gap motor units installed on the substrate chuck moving mechanism that controls a gap between the substrate and the mask stage; and a plurality of air cylinders for supporting the substrate chuck by a certain pneumatic pressure, each of air cylinders controlling the gap between the mask stage and the corresponding area of the substrate to maintain constantly a flatness of the whole area of the substrate chuck, wherein the air cylinders are provided in the positions different from the position of the gap motor units so that the air cylinders are apart from the gap motor units in a predetermined distance to support the portion between the areas of the substrate chuck contacted with the gap motor units, wherein at least one gap motor unit is disposed along the peripheral area of the substrate chuck and the air cylinders are disposed along the peripheral area and the center area of the substrate chuck, wherein the gap motor units are installed on the substrate chuck moving mechanism with a triangular shape, thereby supporting the substrate chuck.