Patent ID: 6741732
Filing Date: 2004-05-25
Classification: G03F,H01J

Abstract:
An exposure method of exposing a second pattern with a second exposure apparatus so as to match a first pattern formed on a sample upon exposure with a first exposure apparatus, said method comprising the steps of:setting a matrix on the sample; measuring or calculating an offset of a point corresponding to each matrix point on the first pattern from an ideal position; forming a distortion correction map representing the measured or calculated offset, wherein a block pitch of a first portion is larger than a block pitch of a second portion on the matrix, an offset in the first portion is smaller than an offset of the second portion, the block pitches are selected based on a required overlay accuracy between the first pattern and the second pattern; and exposing the second pattern on the basis of the distortion correction map, wherein the overlay accuracy is an accuracy of relative position between the first pattern and the second pattern.