Patent ID: 6803991
Filing Date: 2004-10-12
Classification: G03F

Abstract:
An exposure amount control method, comprising the steps of:illuminating an original with exposure light, emitted from a light source, through a light intensity uniforming optical system having at least one fly's eye lens and/or at least one internal reflection member, so that a pattern of the original illuminated is projected onto and printed on a substrate; measuring, by use of a first illuminance sensor, an illuminance of the exposure light at a light source side of the or one of said at least one fly's eye lens and/or said at least one internal reflection member, which is closest to the original; controlling an exposure amount of the substrate on the basis of a measurement output of the first illuminance sensor; measuring, by use of a second illuminance sensor, an illuminance at a position substantially conjugate with the substrate; and calibrating an output of the first illuminance sensor on the basis of a measurement output of the second illuminance sensor.