Patent ID: 11966043
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. An exposure apparatus for exposing a substrate while scanning a mask and the substrate, the exposure apparatus comprising:
a projection optical system including:
a first concave surface;
a convex surface;
a second concave surface; and
a plurality of adjusters configured to apply a force to a rear surface of each of the first concave surface and the second concave surface to adjust a shape of each of the first concave surface and the second concave surface,

wherein the projection optical system is configured to:
project a pattern of the mask onto the substrate; and
cause light transmitted through the pattern of the mask to be reflected by the first concave surface, the convex surface, and the second concave surface, in this order,

wherein the plurality of adjusters are arranged so that force acting points of the plurality of adjusters on the first concave surface and the second concave surface are non-axisymmetric with respect to a horizontal line orthogonal to an optical axis of the convex surface, and
wherein the force acting points are set so that the correction points of the second concave surface are arranged at at least one of:
positions shifted from the correction points of the first concave surface in a radial direction centered on the optical axis; or
positions shifted from the correction points of the first concave surface in a circumferential direction centered on the optical axis.