Patent ID: 6124601
Filing Date: 2000-09-26
Classification: G03F

Abstract:
A position detecting apparatus for detecting the position of a substrate in the interval direction in which the substrate is spaced by an interval from a pattern-printing projection optical system for printing a pattern on the substrate, said apparatus comprising:a first luminous flux projecting system for projecting a first luminous flux to the substrate from a direction oblique to the interval direction;a first luminous flux receiving system for receiving the first luminous flux after the first luminous flux is reflected from the substrate;a second luminous flux projecting system for projecting a second luminous flux to a reflection member arranged at the side portion of the bottom end of said pattern-printing projection optical system;a second luminous flux receiving system for receiving the second luminous flux after the second luminous flux is reflected by the reflection member; andmeans for detecting the position of the substrate in the interval direction by detecting the position at which said first luminous flux receiving system receives the first luminous flux and by detecting the position at which said second luminous flux receiving system receives the second luminous flux.