Patent ID: 8149380

Claim:
An exposure apparatus configured to expose a pattern of an original on a substrate by using light from a light source, said exposure apparatus comprising: an illumination optical system configured to illuminate the original by polarized light by using the light from the light source; a correction unit configured to correct misalignment of an optical axis of the light from the light source and an optical axis of the illumination optical system; and a detecting device configured to detect the misalignment of the optical axes, wherein the correction unit includes a first lens and a deflecting member, the first lens can move in a direction perpendicular to an optical axis of the first lens, and a deflecting direction of the light deflected by the deflecting member is variable, wherein the correction unit moves at least one of the first lens and the deflecting member, and corrects the misalignment of the optical axes based on a result detected by the detecting unit, wherein the detecting unit comprises: a first detecting unit configured to detect a positional misalignment X 1 of the misalignment of the optical axes; and a second detecting unit configured to detect an angular misalignment X 2 of the misalignment of the optical axes, and wherein the detecting unit further comprises: a control unit configured to set a traveling distance Sx of the first lens and a driving amount Tx of the deflecting member by using constants a to d as follows: Sx =( d·X 1 −b·X 2)/( a·d−b·c ) Tx =(− c·X 1 +a·X 2)/( a·d−b·c ) c/a≠d/b.