Patent ID: 6251544
Filing Date: 2001-06-26
Classification: G03F

Abstract:
An exposure dose measuring method for measuring an effective exposure dose on a wafer, comprising the steps of:setting a mask formed with mask patterns each having light transmitting sections and light shielding sections repeated in a period p, a ratio of areas of the light transmitting sections to areas of the light shielding sections of each of the mask patterns being different from ratios of those of the others of the mask patterns, to a projection exposure apparatus having an exposure light wavelength .lambda., a numerical aperture NA at a wafer side, an illumination coherence factor .sigma. and a mask pattern magnification M for patterns to be formed on the wafer;exposing light through the mask patterns of the mask onto a resist coated on the wafer; andobserving a state of exposed portions of the resist on the wafer corresponding to the mask patterns,wherein the period p is set so as to satisfy a relationship of p/M.ltoreq..lambda./(1+.sigma.)NA.