由于人机工程和仿生学设计的需要,空间曲面越来越多地出现在产品设计中,对于这些表面起伏比较大的工件的激光标刻,必须采用动态调焦三轴光束控制技术。分析了动态扩束调焦的原理,从离焦量与像场腰斑位置和大小的关系确定了调焦范围,给出了动态扩束聚焦镜的设计方法。将动态聚焦镜与X,Y方向扫描振镜一起搭建了三维激光标刻系统,在自由曲面上的标刻实验验证了系统的可行性,这种标记方式同样适用于其他二维平面的加工。

As the demand of ergonomics and bionics,more and more free-form surfaces appear in product design. In order to mark on these relatively large undulating surface with laser,the dynamic focusing and three-axis beam control technology must be adopted. The principle of beam focusing by dynamic expansion was analyzed,and the best range was determined from the relationship between the misfocus and the location,sizeofthe beam waist. A dynamic beam focusing mirror was designed,and a three-dimensional laser marking system was constituted together with X,Y directions galvanometer. Marking experiment of free-form surface verified the effectiveness of the system. This form of marking can be also used for the other two-dimensional surface.