Patent ID: 6295629
Filing Date: 2001-09-25
Classification: G03F

Abstract:
A focus correcting method for use in an aligner capable of adjustment of focus position by setting a focusing value, comprising the steps of:(a) forming a resist pattern with at least one focus measuring mark by exposing a resist by said aligner;(b) measuring length of said at least one focus measuring mark in elongate direction;(c) measuring length of a tapered part of said at least one focus measuring mark in which said resist becomes thinner toward an end of said at least one focus measuring mark; and(d) determining a magnitude of deviation from a best focus on the basis of a measurement in said step (b) and also determining direction of said deviation from said best focus on the basis of a measurement in said step (c) to obtain a deviation amount from said best focus, and then setting said focusing value on the basis of said deviation amount from said best focus.