Optical system with adjustable total length for variable focussing of light (laser) beam, with lens module in light beam path for laser 3D scanners also for writing, marking, cutting

摘要

The optical system with adjustable focal length comprises a lens module with at least one concave, or collimation lens (32) in path of laser light beam (20), whose position is adjustable along the laser beam path in translatory manner. The lens is fitted swivelably on an arm (34), itself swivelably about an axis (36) to generate lens motion, with translatory component, along path of laser light beam. Preferably swivel axis is driven by galvanometric motor (38).