Patent ID: 6744512
Filing Date: 2004-06-01
Classification: G03F

Abstract:
A position measuring apparatus which measures position information in a predetermined direction of a mark formed on an object, comprising:an irradiation device which irradiates a detection beam onto the mark; an imaging optical system which forms an image of the mark generated by the mark due to the irradiation of the detection beam, on an image plane; an image pickup device which picks up the image of the mark on the image plane, while scanning a plurality of scanning lines, to generate image information corresponding to the image of the mark; and a calculation device, which is electrically connected to said image pickup device, and which obtains position information in the predetermined direction of the mark, based on the image information, wherein the scanning direction of a scanning line included in the scanning lines which is used for measurement of position information in the predetermined direction of the mark is orthogonal to the predetermined direction.