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

Claim 7:
8. 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 plane surface;
a first concave surface;
a convex surface;
a second concave surface;
a second plane surface; and
a plurality of adjuster configured to apply a force to a rear surface of each of the first plane and the second plane surface to adjust a shape of each of the first plane surface and the second plane 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 plane surface, the first concave surface, the convex surface, the second concave surface, and the second plane surface, in this order, and

wherein the plurality of adjusters are arranged so that force acting points of the plurality of adjusters on the first plane surface and the second plane 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 plane surface are arranged at positions shifted from the correction points of the first plane surface in a translation direction.