Patent ID: 7525645

Claim:
An exposure apparatus comprising: a substrate stage to mount a substrate; a mask stage to mount a plurality of masks, wherein the mask stage includes: a first module having a plurality of support surfaces, on each of which an individual mask is mounted; a mask replacing unit to change a position of the first module so that a mask to be used for a process among the masks mounted on the support surfaces is moved to the process position; and a mask moving unit to move the first module in a straight line during a process; a light source member to illuminate light onto the mask that is positioned in the process position; and a projection lens to project light that has passed through the mask onto the substrate, wherein the first module has a cylindrical shape including an inside space, the support surfaces are provided on an inside surface of the first module and disposed about a circumference of the first module, and the mask replacing unit includes a rotation unit for rotating the first module, wherein the support surfaces are provided on the inside surface of the first module to surround a central axis of the first module, and first openings that pass through the first module are respectively formed in the support surfaces to provide a passage through which a pattern of the mask that is in the process position is transferred to the substrate, and wherein the mask moving unit comprises: a second module having a cylindrical-shaped body that includes a space for receiving the first module and has a second opening to provide a passage through which a pattern of a mask moved to the process position is transferred to the substrate; a support block to support the second module; a first module driver to change a position of the first module relative to the second module; and a second module driver to provide a driving force to move the second module along the support block.