WORKING METHOD BY LASER LIGHT

摘要

PURPOSE:To prevent staining by soot by subjecting a material to be worked to working by laser light while said material is held in tight contact with a plate by the suction effect through through-holes thereby making the working stable and removing the generated smoke. CONSTITUTION:The focus of the laser light irradiated through a protective film 7 from each optical part 4 for emission is matched to the bottom of a groove or slightly above the same and while air is sucked through through-holes 5, a film 1 is imposed in the groove. The inside of the through-holes is maintained under a negative pressure and therefore and film 1 is sucked to the groove bottom at least in the circumferential edges of the through-holes so that the film is maintained always at the level coinciding with the focus. The laser light is irradiated from the parts 4 in such a state to pierce the film 1. The generated smoke is sucked and expelled downward through the holes 5 and part of the smoke diffuses by escaping from the spacing between a protective film 7 and a plate 3 or remains in the groove without staining the parts 4.