| 摘要 |
PURPOSE:To perform automatically a welding operation with high quality by providing a detector with a spot light source means which irradiates successively the light from three spot light sources to the surface near the weld line of materials to be welded and a detector for the position of two-dimensional light spot which receives the light reflected from the spot light source means, etc. CONSTITUTION:A spot light source means 3a of a detector includes three spot light sources 16, 17, 18 realized by light emitting diodes, etc. The light sources 16, 17, 18 are lighted successively by each piece and are so arranged that when one light source, for example, 16 is lighted, the remaining sources 17, 18 are put out. When one light source, for example, 16 is lighted, the beam light 16a thereof is reflected irregularly by the surface of materials 6 to be welded near the weld line 7 and the reflected light arrives at the photodetecting surface of a detector 13 for the position of two-dimensional light spot via a condenser lens 14. The position of the weld line is thus detected with high accuracy and the welding operation is accomplished automatically with high quality. |
