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

Claim 5:
6. 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 adjusters configured to adjust a shape of each of the first plane surface and the second plane surface by apply a force to a rear surface 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,

wherein, in a state where correction points are obtained by projecting force acting points of the plurality of adjusters on the first plane surface in a direction orthogonal to the first plane surface and points obtained by projecting force acting points of the plurality of adjusters on the second plane surface in a direction orthogonal to the second plane surface, the force acting points are set so that, among a first ray in a light flux emitted from a first point on the mask and a second ray in the light flux emitted from a second point on the mask different from the first point, and respectively reflected by the first plane surface and the second plane surface:
the first ray strikes the correction points of the first plane surface but does not strike the correction points of the second plane surface; and
the second ray does not strike the correction points of the first plane surface but strikes the correction points of the second plane 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.