Patent ID: 6777698
Filing Date: 2004-08-17
Classification: B82Y,H01J

Abstract:
An electron beam exposure system exposing a pattern on a substrate, comprising:an electron source for generating an electron beam, a first shaping aperture for shaping said electron beam, a shaping lens for projecting the electron beam that passes said first shaping aperture on a second shaping aperture, a shaping deflector for generating a shaped beam by deflecting the projection image from said first shaping aperture so as to shape a cross-section of the electron beam transmitting the second shaping aperture, a reducing lens for reducing said shaped beam generated with said shaping deflector, an objective lens for focusing said shaped beam image of the shaped beam reduced with said reducing lens on a sample surface, an objective deflector for deflecting said shaped beam to a desired location of said sample surface, a shaping axis adjusting deflector which is arranged on an upper shaping lens and controls an incidence angle of said electron beam to said shaping deflector, an objective axis adjusting deflector which is arranged between the second shaping aperture and the objective lens and controls said incidence angle of said shaped beam to said objective lens, a detector for detecting electrons which are generated by scanning said sample surface with the shaped beam with said objective axis adjusting deflector, a deflector output value adjusting means for adjusting said objective deflector, said shaping axis adjusting deflector and said objective axis adjusting deflector so as to obtain a minimum output value of deviation from said objective deflector, said shaping axis adjusting deflector and said objective axis adjusting deflector, by scanning said sample surface with plural different shaped beams using the second shaping aperture, and a shaping lens adjusting means for setting an adjusting parameter of the shaping lens so as to make dispersion of the location difference a minimum by changing a focal point of said objective lens, under a condition in which said deviation is adjusted to be said minimum output value by said deflector output value adjusting means, by measuring a location on said sample surface of said shaped beam based on information from said detector for detecting electrons generated by scanning a reference mark on said sample surface, by measuring said location difference of said shaped beam before and after said changing, of said focal point of said objective lens relating to said plural different shaped beams, and by obtaining said dispersion of said location difference in said output value of respective one of said deflectors corrected with said deflector output value adjusting means, wherein said objective axis adjusting deflector changes said incidence angle of said shaped beam to said objective lens so as to make said dispersion of said location difference minimum.