| 摘要 |
PROBLEM TO BE SOLVED: To decrease accuracy of light condensing and focusing of irradiation light and to accurately position a fine object for welding in welding a synthetic resin. SOLUTION: An objective site 400 for joining between an outside pipe 200 consisting of a transparent nylon being a light transmitting synthetic resin and an inside pipe 300 is coated with a light absorbing marker 104 and it is irradiated with a visible light containing largely waves in the region of unfocused infrared/far infrared rays as a light L for heat generation. The light L for heat generation passes through the outside pipe 200 and is only absorbed at a part coated with the light absorbing marker 104 to generate heat and the objective site 400 for joining is welded thereby. As only the objective site for joining can be heated only by coating accuracy of the light absorbing marker 104, welding with good accuracy can be performed. As other part is not heated, even for a fine joining object, flexibility is not spoiled. |
