Patent ID: 8163224

Claim:
A method of manufacturing three-dimensionally molded articles, the method comprising: forming a powder layer by supplying pulverized material on a molding plate; forming a sintered layer by irradiating light beams on the powder layer; laminating the sintered layer by repeating the powder layer forming and the irradiation the method further comprising: disposing a correction plate, having a cavity or cavities provided at a predetermined position or predetermined positions, on the molding plate; setting a correction target on the correction plate; forming a mark or marks, at a position or positions corresponding to the cavity or the cavities, on the correction target by irradiating laser beams having a same power as in the radiation of the powder layer, so as to penetrate the correction target; measuring a position of the mark or positions of the marks formed in the marking, and correcting irradiation points of the light beams based on deviation from a predetermined point; and measurement of the position of the mark or positions of the marks in the correction is performed by illuminating the correction target and imaging the contrast due to the illumination.