| 摘要 |
PURPOSE:To detect the occurrence of the defective machining by providing a photosensor to detect the intensity of visible light or infrared light generated from the machining area of a work when a laser beam irradiates an object to be worked. CONSTITUTION:In irradiating the laser beam 2, since pale light is emitted from the surface of the work 6 and the temperature is a rised, the infrared light is also emitted. The photosensor 20 detects the intensity of the visible light or the infrared light emitted from the machining area of the work 6 and converts it into the voltage. A detector 30 process and output signal from the photosensor 20 and outputs a control signal when it is lower than a predetermined set level. In other words, when the defective machining takes place, the output signal of the photosensor 20 becomes lower than that at the normal time and a defective detected signal 31 is outputted. In this way, defective machining is detected and can be prevented. |
