Patent ID: 7184382

Claim:
An energy beam irradiating apparatus comprising: a substrate holder to which a disc-like substrate is attached, including a holder main part on which the disc-like substrate is mounted and a pressing plate, the disc-like substrate being held between the holder main part and the pressing plate with a formation region of an irradiation pattern on the disc-like substrate and a partial region of at least one of an outer edge and an inner edge of the disc-like substrate being exposed; a moving stage that moves the substrate holder; an energy beam irradiating mechanism that irradiates a surface of the disc-like substrate attached to the substrate holder with an energy beam; and a control unit that causes the moving stage to move based on a movement pattern with a reference point set in advance on the moving stage as a reference so that an irradiation pattern is formed on the surface of the disc substrate by irradiation with the energy beam, the control unit calculating, during formation of the irradiation pattern, a center of the disc-like substrate based on at least one part of an outline of the exposed outer edge or inner edge of the disc-like substrate and setting the calculated center as the reference point.