| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a laser marking method which is capable of changing the gray level of a marking even in the case of a high processing speed. <P>SOLUTION: In the laser marking method, a marking pattern is formed on a marking object 6 by irradiating the marking object 6 with pulsed light oscillated from a pulsed light source 1 of an MOPA structure in which a semiconductor laser outputting directly-modulated pulsed light is used as a seed light source. Then, the pulse duration of the pulsed light is changed in order to change a gray level of the marking pattern to be formed. In this way, a peak power of the pulsed light is changed by changing the pulse duration, thereby positively changing the gray level of the marking pattern without changing the processing speed. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
