Patent ID: 7295286

Claim:
An exposure device comprising: a polarizing unit in an optical path between a light source and a photomask, so as to polarize an illuminating light from said light source in a first and a second direction perpendicular to an optical axis of said illuminating light; and an illumination diaphragm in an optical path between said polarizing unit and said photomask, wherein said illumination diaphragm includes, first and second openings located on a straight line running parallel to a third direction perpendicular to said optical axis and passing a center point of said illumination diaphragm, across said center point from each other, and third and fourth openings located on a straight line running parallel to a fourth direction perpendicular to said optical axis and passing said center point, across said center point from each other, wherein said illuminating light polarized in said first and said second direction by said polarizing unit passes through each of said openings, and wherein a condition of 0<θ 3 <θ 2 <θ 4 <180° is satisfied, where θ 2 , θ 3 and θ 4 represent an angle at which a straight line parallel to said second, said third and said fourth direction, respectively, crosses with a straight line parallel to said first direction.