Patent ID: 6999159

Claim:
An exposure apparatus, comprising: a first separating portion for separating a first space and a second space from each other, said first separating portion having a first aperture and a second aperture; and a second separating portion for separating the second space and a third space from each other, said second separating portion having a third aperture and a fourth aperture, wherein said first aperture, said third aperture, said second aperture and said fourth aperture are disposed along the named order, with respect to a rotational direction about an optical axis of said exposure apparatus, and wherein said third aperture is disposed approximately at the middle between said first and second apertures with respect to the rotational direction about the optical axis of said exposure apparatus, and wherein said fourth aperture is disposed approximately at the middle between said first and second apertures with respect to the rotational direction about the optical axis of said exposure apparatus and at a position different from the position of said third aperture.