Patent ID: 6825440
Filing Date: 2004-11-30
Classification: B23K,C03B,G02B

Abstract:
A laser beam machining method, in which a work is irradiated with a laser beam to melt-evaporate the portion irradiated with the laser beam for machining the work, comprising:a mask having a light-transmitting section that is predetermined times as large as the laser beam machining spot corresponding to the form of the portion undergoing melt-evaporation of the work, is disposed between a laser beam source and the work, and the laser beam transmitted from a laser beam source through a beam-shaping optical system is irradiated to said mask in a range larger than said light-transmitting section of the mask, and the real image of the light-transmitting section formed by the transmitted light is reduced to the size of said machining spot by means of a reduced image-forming optical system, to form the reduced image on the work, and rotating the work around an axis perpendicular to an axis of the laser beam while the work is being machined by melt evaporation.