Patent ID: 7408620

Claim:
An exposure apparatus comprising: an illumination optical system for illuminating a reticle with light from a light source; a projection optical system for projecting a pattern of the reticle onto an object, said projection optical system including a plane-convex lens; and a lens barrel that retains the plane-convex lens, wherein a plane surface of the plane-convex lens is smaller than an effective area of a convex surface of the plane-convex lens, wherein said exposure apparatus exposes the object via a liquid that is filled in a space between the plane surface of the plane-convex lens and the object, wherein an external shape of the plane surface of the plane-convex lens is rectangular, and an external shape of the convex surface of the plane-convex lens is circular, wherein the lens barrel includes a retaining member for retaining the plane-convex lens and a supply channel for supplying the liquid via a supply port, and wherein the retaining member of the lens barrel is formed at an upper part of the supply channel.