| 摘要 |
<p>A system and method for direct laser marking of plastics capable of achieving improved dark-on-light marking, light-on-dark marking, and tone-on-tone color marking. The system and method includes a laser source and a laser beam focusing and steering device for directing a laser beam onto a plastic substrate in a predetermined pattern, wherein the laser source has a wavelength in the range of 1060 nm and 1070 nm, a pulse width in the range of 10 ns and 120 ns, and a beam quality mode with an M2 factor near 1. A laser beam generated by such a laser source can be diverged while still maintaining the advantageous laser marking characteristics, thus increasing the working distance. Laser marking according to the present invention yields improved cosmetic and aesthetic properties, micro-marking capabilities, and improved machine readability characteristics for techniques such as bar codes and data matrix codes.</p> |
