Patent ID: 7230706

Claim:
A method of exposing an object to be exposed, said method comprising the steps of: (a) detecting a position of the object to be exposed by a position detection method of detecting a position of an object to be observed by a position detection system, said position detection method comprising the steps of: (i) obtaining detection signals of an alignment mark composed of a plurality of marks on the object a plurality of number of times, by the position detection system; (ii) respectively calculating a mark spacing between the plurality of marks from each of the detection signals obtained in the obtaining step; (iii) evaluating measurement reproducibility of the position detection system on the basis of mark spacing information obtained from the calculating steps; and (iv) detecting the position of the object by the position detection system, of which the measurement reproducibility is evaluated; (b) positioning the object on the basis of a detection result of the detecting step; and (c) exposing the positioned object.