Patent ID: 6060684
Filing Date: 2000-05-09
Classification: B23K,G02F,G03F

Abstract:
A laser beam machine comprising:a laser beam oscillator operative to produce a laser beam; andan optical system operative to guide said laser beam along a predetermined optical path, said optical system including a beam forming member operative to form a beam shape by passing said laser beam through a through-hole, an object glass operative to focus the laser beam emitted from said beam forming member to a spot and apply the focussed laser beam to a workpiece, an acousto-optical switching device, and a mode converting member operative to convert an energy distribution of an incoming laser beam to a multimode distribution in which a high-energy domain of said incoming laser beam is expanded, said mode converting member additionally operative to emit a laser beam of said energy distribution about an optical axis of said incoming laser beam, said laser beam emitted from said mode converting member being guided to enter said beam forming member, the workpiece mounted on a stage adjustable in two independent orthogonal directions by linear motors, the switching device operative to stop the laser beam from being applied to the workpiece in response to a position of the stage.