Patent ID: 8609301

Claim:
An exposure apparatus which exposes a projected image of a pattern onto a substrate moving in a predetermined direction, comprising: a mask driving apparatus which rotates a cylinder-shaped mask about a predetermined rotation axis, wherein the cylinder-shaped mask includes: a circular cylinder-shaped outer surface of a constant radius from the rotation axis, a pattern formation area which is placed along the outer surface and arranged inward from both ends of the outer surface in a direction of the rotation axis, a first scale area which is placed along the outer surface and arranged between the pattern formation area and one of the ends of the outer surface, an a second scale area which is placed along the outer surface and arranged between the pattern formation area and the other of the ends of the outer surface; a substrate driving apparatus which moves the substrate in the predetermined direction in synchronization with the rotation of the cylinder-shaped mask; a position detecting apparatus which includes a first encoder system located to face with the first scale area for measuring a rotational position of the cylinder-shaped mask and a second encoder system located to face with the second scale area for measuring a rotational position of the cylinder-shaped; and a controller that controls the mask driving apparatus based on detection results from the first and second encoder systems during rotation of the cylinder-shaped mask.