Patent Number: 
Section: claims

1. An electron beam exposure system for exposing a pattern on a wafer by a plurality of electron beams, comprising: an electron beam generating section for generating the plurality of electron beams;  an electron lens section with a plurality of apertures through which the plurality of electron beams pass, for independently focusing the plurality of electron beams; and  a first magnetic field formation section, which is provided in at least one of the plurality of apertures, for forming a magnetic field in a direction substantially perpendicular to an irradiation direction of the electron beams passing through one of said plurality of apertures. 2. The electron beam exposure system as claimed in  claim 1 , wherein said first magnetic field formation section is provided on a wall of one of said plurality of apertures. claim 1 3. The electron beam exposure system as claimed in  claim 2 , wherein said first magnetic field formation section comprises a coil for forming a magnetic field and an insulating member provided between said coil and the wall of the aperture. claim 2 4. The electron beam exposure system as claimed in  claim 1 , wherein said first magnetic field formation section comprises: claim 1 a plurality of first magnetic field formation sections, which are provided in the plurality of apertures; and  a coil control section for independently controlling current supplied to each of said plurality of first magnetic field formation sections. 5. The electron beam exposure system as claimed in  claim 4 , wherein said coil control section independently controls current supplied to each of said plurality of first magnetic field formation sections based on position of each of said plurality of apertures in which each of said plurality of first magnetic field formation sections is provided. claim 4 6. The electron beam exposure system as claimed in  claim 5 , wherein said coil control section controls the current so that current supplied to a part of said plurality of magnetic field formation sections provided in first apertures of the plurality of apertures is higher than current supplied to another part of said plurality of magnetic field formation sections provided in second apertures of the plurality of apertures, where the second apertures are located outside of the first apertures in said electron lens section. claim 5 7. The electron beam exposure system as claimed in  claim 1 , further comprising a second magnetic field formation section provided in a position for forming magnetic field in a direction substantially perpendicular to the direction of the magnetic field formed in the aperture by said first magnetic field formation section. claim 1 8. The electron beam exposure system as claimed in  claim 7 , further comprising a coil control section for independently controlling the current supplied to said first magnetic field formation section and current supplied to said second magnetic field formation section. claim 7 9. The electron beam exposure system as claimed in  claim 7 , further comprising a third magnetic field formation section and a fourth magnetic field formation section, which are provided in an opposite side of the first magnetic field formation section and the second magnetic field formation section respectively. claim 7 10. The electron beam exposure system as claimed in  claim 1 , wherein said electron lens section comprises: claim 1 a first magnetic conductor with a plurality of apertures through which the plurality of electron beams pass;  a second magnetic conductor with a plurality of apertures through which the plurality of electron beams pass; wherein said second magnetic conductor is provided substantially parallel with said first magnetic conductor;  said first magnetic field formation section is provided in the apertures of said first magnetic conductor, and  the electron beam exposure system further comprises a fifth magnetic field formation section provided in the apertures of said second magnetic conductor. 11. The electron beam exposure system as claimed in  claim 10 , further comprising a cooling section for cooling said first magnetic conductor and said second magnetic conductor. claim 10 12. The electron beam exposure system as claimed in  claim 1 , further comprising: claim 1 a substrate, which is provided substantially in parallel with said electron lens section, including wiring in which the current to said first magnetic field formation section flows; and  a wire section for connecting said first magnetic field formation section and said wiring. 13. An electron lens for independently focusing a plurality of electron beams, comprising: a first magnetic conductor with a plurality of apertures through which the plurality of electron beams pass;  a second magnetic conductor with a plurality of apertures through which the plurality of electron beams pass, wherein said second magnetic conductor is provided substantially parallel with said first magnetic conductor; and  a magnetic field formation section, which is provided in at least one aperture of the plurality of first apertures and the plurality of second apertures, for forming a magnetic field in a direction substantially perpendicular to an irradiation direction of the electron beams passing through said apertures. 14. An electron beam exposure system for exposing a pattern on a wafer by a plurality of electron beams, comprising: an electron beam exposure apparatus comprising:  an electron beam generating section provided at one end of said electron beam exposure apparatus;  a wafer stage provided at the other end of said electron beam exposure apparatus, and opposing to said electron beam generating section;  at least one shaping member provided between said electron beam generating section and said wafer stage, including a plurality of apertures having predetermined shapes, each of said apertures having an axis extending in a direction substantially parallel with an irradiation direction of the electron beams; and  at least one electron lens section provided between said electron beam generating section and said wafer stage, and positioned either upstream or downstream of said shaping member in the irradiation direction of the electron beams, said electron beam generating section comprising:  a plurality of apertures with an axis extending in a direction substantially parallel with the irradiation direction of the electron beams; and  at least one magnetic field formation section provided at each of said plurality of apertures for forming a magnetic field in a direction substantially perpendicular to the irradiation direction of the electron beams passing through each of said plurality of apertures. 15. An electron lens used for an electron beam exposure system for exposing a pattern on a wafer by a plurality of electron beams, comprising: a plurality of apertures with an axis extending in a direction substantially parallel with an irradiation direction of the electron beams; and  at least one magnetic field formation section provided at each of said plurality of apertures, for forming a magnetic field in a direction substantially perpendicular to the irradiation direction of the electron beams passing through each of said plurality of apertures. 16. An electron lens section disposed in an electron beam exposure apparatus, comprising: a plurality of apertures with an axis extending in a direction substantially parallel with an irradiation direction of the electron beams; and  at least one magnetic field formation section provided in at least one of the plurality of apertures for forming a magnetic field in a direction substantially perpendicular to the irradiation direction of the electron beams passing through one of said plurality of apertures.