Patent ID: 9360763
Filing Date: 2016-06-07
CPC Classification: G02B,G03F

Claim Text:
1. An exposure apparatus which exposes a substrate to light from a pattern through liquid, the exposure apparatus comprising: a stage which holds the substrate; a projection optical system which projects a reduced image of the pattern with the light onto the substrate through the liquid; and a driving system which drives the stage so that in a scanning exposure of the substrate, the substrate is moved relative to the light with respect to a first direction perpendicular to an optical axis of the projection optical system, wherein the projection optical system comprises a refractive optical element having a light emitting surface, through a part of which the light passes in use and which is arranged nearest to an imaging plane of the projection optical system to contact the liquid in use, wherein the refractive optical element has a protruding portion formed in a light emitting side of the refractive optical element so as to protrude toward the imaging plane with respect to a surrounding portion other than the protruding portion, and wherein the protruding portion is formed so that a center of the light emitting surface is decentered from the optical axis with respect to the first direction.