VORRICHTUNG ZUR FOKUSSIERUNG EINES LASERSTRAHLS

摘要

A first telescopic structure (3) has an optical element (4) for collimating a laser beam (2). A subordinate focussing optical element (5) focusses the laser beam on a focal point (6). A second telescopic structure (7) with first (8) and subordinate second (9) lenses fits in a divergent beam path in front of the first telescopic structure. An independent claim is also included for a scanner processing head for processing work pieces with a device for focussing a laser beam.