Patent ID: 7936446

Claim:
An exposure apparatus which illuminates a reticle with illumination light from a light source and projects light from the reticle onto a substrate to expose the substrate to light, said apparatus comprising: a shutter located on a path of the illumination light; a detector configured to detect an exposure dose to the substrate; and a controller configured to control operation of said shutter, wherein in a first exposure mode which uses illumination light with a first light intensity, said controller is configured to control an open shutter time of said shutter based on an output from said detector, and to store the open shutter time, and in a second exposure mode which uses illumination light with a second light intensity higher than the first light intensity, said controller is configured to control a speed of said shutter based on the stored open shutter time, wherein said controller is configured to control the open shutter time in the first exposure mode for at least one leading substrate of a lot including a plurality of substrates, and to control the speed in the second exposure mode for every other substrate following the at least one leading substrate.