Patent ID: 8462316
Filing Date: 2013-06-11
Classification: G03F

Abstract:
1. An apparatus which illuminates an original by an illumination optical system, and projects a pattern of the original onto a substrate by a projection optical system, the illumination optical system including an adjusting mechanism configured to adjust a light intensity distribution on a pupil plane of the projection optical system, the apparatus comprising: a measuring device configured to measure a light intensity distribution that is formed on the pupil plane of the projection optical system, a detector configured to detect a total light quantity on the pupil plane, and a controller configured to determine a light quantity, to be detected by the detector when a target light intensity distribution is formed on the pupil plane, as a target light quantity based on the measured light intensity distribution and the detected total light quantity, and to control the adjusting mechanism so that the detected total light quantity becomes the target light quantity, wherein the controller calculates light quantities of a plurality of evaluation regions on the pupil plane, based on the measured light intensity distribution, and determines the target light quantity based on the calculated light quantities of the plurality of evaluation regions and the detected total light quantity, wherein the adjusting mechanism includes a plurality of adjusting members and a plurality of driving units configured to drive the plurality of adjusting members, wherein quantities of light beams which enter the plurality of evaluation regions are to be changed in accordance with the driving of the plurality of adjusting members, and wherein the controller controls the plurality of driving units, based on the calculated light quantities of the plurality of evaluation regions, so that the detected total light quantity becomes the target light quantity.