Patent ID: 7344076
Filing Date: 2008-03-18
Classification: G21B,Y02E

Abstract:
1. A laser processing device, comprising: a laser light source for emitting laser light; an irradiating optical system for irradiating laser light emitted from said laser light source substantially perpendicularly onto a processing surface of an object to be processed; a reflected light monitoring unit for monitoring the intensity of light reflected from the processing surface which is being irradiated with the laser light from said irradiating optical system; a thermal radiation monitoring unit for monitoring the intensity of thermal radiation generated at the processing surface which is being irradiated with the laser light from said irradiating optical system; and a controller for controlling output of laser light from said laser light source, wherein said controller determines abnormality and either one of reduces and stops output of laser light from said laser light source when the intensity of reflected light monitored by said reflected light monitoring unit drops below a first prescribed value during irradiation by the laser and the output of laser light from said laser light source is in a prescribed state and either one of prior to the start and after the end of thermal radiation.