Patent ID: 7122809

Claim:
A charged beam writing method comprising: preparing a charged beam writing tool comprising: a first shaping aperture and a second shaping aperture disposed apart from each other in a beam axis direction in order to shape a charged beam, the second shaping aperture having a plurality of apertures formed thereon; a shaping deflector disposed between the first shaping aperture and the second shaping aperture; an objective deflector which irradiates a shaped beam formed by the first shaping aperture and the second shaping aperture and the shaping deflector on a desired position on a surface of a substrate to be processed; a blanking deflector disposed on an upstream side of the first shaping aperture; a blanking aperture disposed on a downstream side of the second shaping aperture to intercept the shaped beam based on driving of the blanking deflector; and a detector which detects shapes or positions of the plurality of apertures of the second shaping aperture; acquiring reference data of the shapes or the positions of the plurality of apertures of the second shaping aperture; performing a writing operation after acquiring the reference data; measuring shift amounts of the shapes or the positions of the plurality of apertures of the second shaping aperture by scanning a beam passed through the first shaping aperture over the second shaping aperture in a state in which the blanking deflector is driven to prevent the shaped beam from irradiating the surface of the substrate to be processed by the blanking aperture after performing the writing operation for a certain time, measuring with the detector the shapes or the positions of the plurality of apertures of the second shaping aperture irradiated on a surface of the blanking aperture, and comparing the shapes or the positions with the reference data; correcting a deflection amount of the objective deflector or the shaping deflector in accordance with the shift amount; and resuming the writing operation after interrupting the driving of the blanking deflector.