Patent ID: 6097474
Filing Date: 2000-08-01
Classification: G03F

Abstract:
A apparatus for adjusting an illumination field used in scanning photolithography comprising:a plurality of blades, said plurality of blades being pivotally connected together at each end;a plurality of push rods, one of each of said plurality of push rods coupled to connected ends of two of said plurality of blades;a drive connected to each of said plurality of push rods, said drive moving said push rods whereby said plurality of blades are moved into and out of the illumination field;a controller coupled to said drive, said controller controlling the movement of said drive;an exposure calculator coupled to said controller, said exposure calculator calculating a corrected exposure dose and required movement of said plurality of blades into and out of the illumination field to obtain the corrected exposure dose; anda data storage device coupled to said exposure calculator, said data storage device storing information required by said exposure calculator to calculate the corrected exposure dose,whereby the illumination field is dynamically adjusted during scanning of a photosensitive substrate reducing line width variations.