Patent ID: 7217503

Claim:
A projection exposure method comprising the steps of: providing a mask that arranges a contact hole pattern and a plurality of auxiliary patterns with each being smaller than the contact hole pattern; and illuminating the mask with first illumination light for resolving the contact hole pattern, and second illumination light for preventing a false resolution caused by the auxiliary patterns and the first illumination, wherein the first and second illumination light form an effective light source that has a non-circular dark portion at a center portion thereof, the first illumination light forms the parts of the effective light source in each of radially longitudinal directions of 0°, 90°, 180°, and 270°, the second illumination light forms the parts of the effective light source in each of radially longitudinal directions of 45°, 135°, 225° and 315°, the radially longitudinal direction of 0° is a direction that the contact hole pattern and the auxiliary patterns line up.