| 摘要 |
PURPOSE:To realize the black marking excellent in the durability on the surface of a work. CONSTITUTION:A recessed part formed on the surface of a work 10 made of plastics is the heated and evaporated part of the part irradiated with the laser beam. The black carbonized layer 11 of the plastics is generated and left on the surface of the recessed part, and this carbonized layer 11 apparently becomes the black marking. This carbonized layer 11 is firmly adhered to the surface of the recessed part, and does not disappear even when the time is elapsed. Even when the surface of the work 10 is rubbed with other members, the carbonized layer 11 is in the part recessed from the surface of the work 10, and does not disappear. The other part than the black marked part becomes the color of the material of the work 10. |
