| 摘要 |
PURPOSE:To position part to be worked of a work and a laser beam coaxial easily and perform highly accurate laser working by providing an element that detects reflected beam at the tip of a working head in a laser working device. CONSTITUTION:When a laser beam 2 is not irradiated on a welded part 7 of a work, most part of the laser beam 2 is reflected, and the reflected beam 11 passes through a filter 12 attached to the tip face of a working head 5, absorbed by a photoelectric element 10 and converted to an electric signal. A comparator circuit 13 compares the signal from the photoelectric element 10 with an electric signal corresponding to the welded part 7 set beforehand, and outputs the signal of difference to an arithmetic circuit 10. The arithmetic circuit 10 operates the amount of movement of a working stand 8 basing on the signal from the comparator circuit 13 and outputs a signal to a driving motor 9. The driving motor 9 is operated and welded part of the work 6 is set at the position of irradiation of the laser beam 2. |
