Patent ID: 6323937
Filing Date: 2001-11-27
Classification: G03F

Abstract:
A projection exposure apparatus for transferring, by projection exposure using a plurality of pulse lights, a pattern of a first object onto a second object while moving the first and second objects in a scan direction, said apparatus comprising:a light source for producing pulse light;a secondary light source defined by use of the pulse light from said light source; anda slit disposed away from the first object or a plane being conjugate therewith, wherein the pulse light from said secondary light source passes through said slit and is projected onto the first object, by which a light intensity distribution of a trapezoidal shape with respect to the scan direction is produced on the first object,wherein, when R is an effective radius of the secondary light source, d is an optical distance from the slit to the first object or the plane conjugate therewith, f is a focal length of an optical member for projecting the pulse light from the secondary light source toward the slit, F is a pulse emission frequency of the light source, and V is a movement speed of the first object in the scan direction during the scan exposure thereof, at least one of the optical distance d, the focal length f, the emission frequency F, and the movement speed V is changed in accordance with a change in the effective radius R, so as to make uniform an integrated exposure amount distribution to be provided by plural pulse lights.