| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a laser beam processing method in which a protective sheet is not peeled out from the surface of a processed work during processes for making a piercing hole, and for cutting followed thereafter. SOLUTION: While an assisting gas is blowing onto the processed work, a laser beam L is first irradiated to a processed work 3 so that an encircled portion surrounding a piercing point P of a protective sheet 5 is only cut. Next, the laser beam L is irradiated to the piercing point P so that a piercing hole 3a is made in a basic material 4. Then, the laser beam L is irradiated to the processed work 3 so that a through hole in an up and down direction to pass through the assisting gas is made at the place of the piercing hole 3a.</p> |
