Patent ID: 6407398
Filing Date: 2002-06-18
Classification: B82Y,H01J

Abstract:
An electron beam exposure apparatus comprising:an electron gun for emitting an electron beam; a convergence unit able to converge an electron beam on a sample and dynamically change the focus position; a deflecting unit for deflecting the electron beam, the deflecting unit including a plurality of deflectors and being able to deflect the same amount of deflection with different incident angles by combining the amounts of deflection of the plurality of deflectors; a movement mechanism for carrying and moving the sample; a mark position detecting unit for detecting a change in reflected electrons at a mark provided on the sample when scanning the mark by the electron beam and thereby detecting the position of the mark; a deflection data and incident angle relation storing circuit for storing a relationship between the deflection amount and the incident angles when the electron beam is deflected according to the combinations of the amounts of deflection of the plurality of deflectors; a mark position difference calculating unit for scanning the same mark arranged at the same position with different incident angles to detect the position of the same mark by using the mark position detecting unit and calculating the difference in the detected positions; and a height calculating unit for calculating the height of the sample from the difference of the detected positions and the difference between the incident angles.