Patent ID: 7151788
Filing Date: 2006-12-19
Classification: B23K

Abstract:
1. A laser processing device, comprising: a laser beam source emitting a laser beam; a condensing lens condensing the laser beam; an optical fiber having an incident surface receiving the laser beam from the condensing lens and an emission surface emitting the laser beam, an adjusting unit, which is provided between the laser beam source and the condensing lens, enabling to change an angle of divergence of the laser beam from the condensing lens on the incident surface of the optical fiber; and a condensing optical system condensing the laser beam emitted from the emission surface of the optical fiber onto an object to be processed by the condensing optical system, wherein when the angle of divergence of the laser beam on the incident surface of the optical fiber is changed by the adjusting unit, the angle of divergence of the laser beam condensed onto the object to the processed is changed, and a diameter of a beam spot on the object to be processed is changed.