Patent Number: 063234998
Section: claims

1. An electron beam exposure apparatus comprising: a source for emitting an electron beam;  an electron optical system for bringing the electron beam into a focus on a target exposure surface; and  electron density distribution adjustment means for adjusting an electron density distribution of the electron beam when the electron beam passes through a pupil plane of said electron optical system or a position conjugate to the pupil plane, in which density distribution an electron density at a peripheral portion on the pupil plane becomes higher than that at a central portion.  a source for emitting an electron beam;  an electron optical system for bringing the electron beam into a focus on a target surface; and  a hollow beam forming stop arranged on the pupil plane of said electron optical system or at a position conjugate to the pupil plane, wherein the electron density distribution at a peripheral portion on the pupil plane becomes higher than that at the central portion.  a source for emitting an electron beam;  an electron optical system for bringing the electron beam into a focus on a target exposure surface; and  an aperture stop for shielding the electron beam entering a center thereof, wherein the electron density distribution at a peripheral portion on the pupil plane becomes higher than that at the central portion. 2. The apparatus according to claim 1, wherein said electron optical system projects, onto said target exposure surface, an electron beam transmitted through a mask held between said source and said electron optical system. 3. The apparatus according to claim 1, wherein said electron optical system projects, onto said target exposure surface, a variable rectangular beam formed by a first aperture having a regular shape and a second aperture having a rectangular shape. 4. The apparatus according to claim 1, wherein said electron density distribution adjustment means includes a stop for forming a hollow beam. 5. The apparatus according to claim 1, further comprising a correction electron optical system arranged between said source and said electron optical system to form a plurality of intermediate images of said source for correcting an aberration generated by said electron optical system, the intermediate images being projected on said target exposure surface by said electron optical system. 6. The apparatus according to claim 5, wherein said correction electron optical system has a plurality of element electron optical systems each of which forms one intermediate image. 7. The apparatus according to claim 6, wherein said electron density distribution adjustment means has a plurality of aperture stops each of which shields an electron beam which enters near an optical axis of a corresponding one of said element electron optical systems. 8. The apparatus according to claim 6, wherein said electron density distribution means is arranged on the pupil plane of said electron optical system or at a position conjugate to the pupil plane. 9. A device manufacturing method of manufacturing a device by using an electron beam exposure apparatus of claim 1. 10. An electron beam exposure apparatus comprising: 11. The apparatus according to claim 10, wherein an electron density distribution of the electron beam is adjusted by said hollow beam forming stop such that an electron density at a peripheral portion on the pupil plane becomes higher than that at a central portion. 12. The apparatus according to claim 10, wherein said electron optical system projects, onto said target exposure surface, an electron beam transmitted through a mask held between said source and said electron optical system. 13. The apparatus according to claim 10, wherein said electron optical system projects, onto said target exposure surface, a variable rectangular beam formed by a first aperture having a rectangular shape and a second aperture having a rectangular shape. 14. A device manufacturing method of manufacturing a device by using an electron beam exposure apparatus of claim 10. 15. An electron beam exposure apparatus comprising: 16. The apparatus according to claim 10, wherein an electron density distribution of the electron beam is adjusted when the electron beam passes through a pupil plane of said electron optical system or a position conjugate to the pupil plane, in which density distribution an electron density at a peripheral portion on a pupil plane of said electron optical system becomes higher than that at a central portion. 17. The apparatus according to claim 15, wherein said aperture stop comprises a stop for forming a hollow beam. 18. The apparatus according to claim 15, wherein said electron optical system projects, onto said target exposure surface, an electron beam transmitted through a mask held between said source and said electron optical system. 19. The apparatus according to claim 15, wherein said electron optical system projects, onto said target exposure surface, a variable rectangular beam formed by a first aperture having a rectangular shape and a second aperture having a rectangular shape. 20. The apparatus according to claim 15, further comprising a correction electron optical system arranged between said source and said electron optical system to form a plurality of intermediate images of said source for correcting an aberration generated said electron optical system, the intermediate images being projected on said target exposure surface by said electron optical system. 21. The apparatus according to claim 20, wherein said correction electron optical system has a plurality of element electron optical systems each of which forms one intermediate image. 22. The apparatus according to claim 20, wherein said electron density distribution adjustment means has a plurality of aperture stops each of which shields an electron beam which enters near an optical axis of a corresponding one of said element electron optical systems. 23. A device manufacturing method of manufacturing a device by using an electron beam exposure apparatus of claim 15.