Method and apparatus for dynamic focusing control of a radiant energy beam

摘要

Beam focusing and scanning method and apparatus are shown comprising a plane mirror (40) upon which a laser beam (32) is directed through a focusing lens (38). The beam is reflected back through the focusing lens (38) onto a pivotal mirror (52). The plane mirror (40) is movable back and forth along the beam axis, and the movement of plane mirror (40) and pivotal mirror (52) is synchronized whereby the beam is focused at the face of an object (54) while scanned across the object.