Patent ID: 6130751
Filing Date: 2000-10-10
Classification: G03F

Abstract:
A positioning method of detecting a position of an object, fixed on driving means, in a direction of height as a driving direction, by surface position detection means, while scanning the object in a direction perpendicular to the driving direction of the driving means and positioning and correction driving the object by the driving means to sequentially set the object at a predetermined position and a predetermined height, said method comprising:a step of monitoring a driving condition of the driving means in synchronism with a periodical detection performed by the surface position detection means; anda step of correcting a drive amount of the driving means on the basis of the periodical detection performed by the surface position detection means and a result of the monitoring performed in said monitoring step, said correcting step including the steps of (i) calculating a mean data of the drive amount by the driving means in one detecting period of the periodical detection performed by the surface position detection means, on the basis of the result of the monitoring, and (ii) obtaining a correction amount of the driving on the basis of the mean data and the detection result of the surface position detection means obtained in the one detecting period.