Patent ID: 6704092
Filing Date: 2004-03-09
Classification: G03F

Abstract:
A projection exposure apparatus which exposes an object through a projection optical system, with light irradiated on a mask from a light source, comprising:an illumination optical system disposed on an optical path through which light from the light source passes to illuminate the mask with light through an optical integrator; and a shaping optical system disposed between the light source and the optical integrator in the illumination optical system to form different intensity distributions of the light on a predetermined plane substantially conjugate with a pupil plane of the projection optical system, the shaping optical system includes a diffraction optical element that generates diffracted light in a direction different from the optical axis to form a first one of the different intensity distributions having an increased intensity portion apart from the optical axis relative to a portion of the first intensity distribution on the optical axis, and a movable optical element disposed on the optical axis to adjust the first intensity distribution, and changes the first intensity distribution to a second one of the different intensity distributions by exchange of the diffraction optical element.