3D dynamic focus laser marking machine uses a high energy density laser to locally irradiate the workpiece to make the surface layer undergo a chemical reaction in which the material vaporizes or changes color, leaving a permanent mark. The traditional 2D laser marking adopts the post-focusing method, and generally can only perform plane marking within the specified range. The advent of the new 3D laser marking machine solves the inherent defect of the 2D laser marking machine for a long time. The 3D laser marking machine adopts an advanced front gathering method and has an additional dynamic focusing seat, which adopts optical principles similar to imaging. Through software control and moving the dynamic focusing mirror, variable beam expansion is performed before the laser is focused, so as to change the focal length of the laser beam to achieve accurate surface focusing processing of objects with different heights. 3D laser marking is a laser surface depression processing method. Compared with traditional 2D laser marking, 3D marking has greatly reduced the surface flatness requirements of the processed object, and the processing effects are rich and colorful.

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