Patent ID: 7923659

Claim:
A laser machining apparatus comprising: an X mirror whose axis of rotation is in an X-direction, a Y mirror whose axis of rotation is in a Y-direction, a converging lens, wherein a laser being is positioned by the X mirror and the Y mirror and made to enter the converging lens, and an optical device arranged on an optical axis of the laser beam for correcting a curvature of a reflective surface of the X mirror or the Y mirror and for making converged positions of the laser beam in the X-direction and in the Y-direction coincident with a point on the optical axis, wherein a focal distance of the optical device is determined based on a difference between a sum of deformation extents in the X-direction and a sum of deformation extents in the Y-direction, and the deformation extents are relative to respective centers of the X mirror and the Y mirror.