| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a laser beam machining device with which a work to be machined is cut without causing a molten surface or a crack strayed from an intended line to be cut on the surface of the work to be machined. SOLUTION: The laser beam machining device 100 is provided with a laser light source 101 which emits a laser beam L of which pulse width becomes 1μs or smaller, a lens selection means 405 which can select a condenser lens 105 which condenses the laser beam so that the peak power density of the laser beam at a condensed point P is 1×10<8> (W/cm<2> ) or greater, a means 113 with which the condensed point of the laser beam is aligned with the inner part of the work 1 to be machined, moving means 109 and 111 which move the condensed point of the laser beam along the intended line to be cut 5, a means 127 which preliminarily storages the correlation between an aperture number and the dimension of a modified spot and selects the dimension of the modified spot formed with the selected aperture number and a dimension display means 129 which displays the dimension of the modified spot.</p> |
