Patent ID: 7916273
Filing Date: 2011-03-29
Classification: G03F

Abstract:
1. An exposure apparatus comprising: an illumination optical system for illuminating a reticle using light from a light source; and a projection optical system for projecting a pattern of the reticle onto a substrate, said exposure apparatus being suitable for exposing the substrate through a liquid that is supplied to a space between the substrate and a lens of the projection optical system closest to the substrate, wherein the lens is made of SiO wherein a surface of the lens which the light does not pass through and which the liquid directly contacts, includes a polished surface which is polished to prevent an adhesion of particles, wherein the polished surface is a cleaned polished surface on which a protective film is not formed, and wherein the lens is incorporated into the projection optical system such that the liquid is supplied to the space between the substrate and the lens so that the liquid directly contacts the cleaned polished surface.