Patent ID: 8363207

Claim:
An exposure apparatus that illuminates an original with light from a light source so as to project a pattern of the original onto a substrate via a projection optical system for exposure, the exposure apparatus comprising: a first shutter that shields light passing through a clearance between the light source and the projection optical system; and a control device that controls the opening and closing of the first shutter, wherein before starting exposure using a second original following a first original after an exposure operation has been completed using the first original, the control device controls the first shutter so that the temperature of the projection optical system approaches closer to the projection optical system's saturation temperature via the second original, wherein when the projection optical system's saturation temperature via the second original is higher than the projection optical system's saturation temperature via the first original, the control device opens the first shutter to irradiate the light on the projection optical system, and wherein when the projection optical system's saturation temperature via the second original is lower than the projection optical system's saturation temperature via the first original, the control device closes the first shutter to shield the light on the projection optical system.