Patent ID: 8319147

Claim:
A laser machining method of trepanning a hole in a workpiece using a first pulsed laser beam with an irradiation position positioned by a first XY galvanic unit, and by using a second pulsed laser beam with an irradiation position positioned by the first XY galvanic unit and a second XY galvanic unit, each of the first XY galvanic unit and the second XY galvanic unit having a galvanic mirror, the hole having a diameter larger than a diameter of the first pulsed laser and the second pulsed laser, said method comprising: adjusting the first XY galvanic unit so that the first pulsed laser beam draws a first circular orbit having a first radius; adjusting the second XY galvanic unit so that the second pulsed laser beam draws a second circular orbit having a second radius, the second circular orbit being centered on the irradiation position of the first pulsed laser beam; and irradiating the first pulsed laser beam and the second pulsed laser beam toward the workpiece at predetermined time intervals on the first circular orbit and the second circular orbit, respectively, while always rocking the galvanic mirror of each of the first XY galvanic unit and the second XY galvanic unit so as to position the irradiation position of the first pulsed laser beam using the first XY galvanic unit and so as to position the irradiation position of the second pulsed laser beam using the first XY galvanic unit and the second XY galvanic unit to thereby trepan the hole in the workpiece.