Patent ID: 9073266
Filing Date: 2015-07-07
Classification: B29C,B29K

Abstract:
1. An apparatus for laser welding thermoplastic resin members in which a first member formed of a transmissive thermoplastic resin that transmits a laser beam is brought into contact with a second member formed of an absorptive thermoplastic resin that absorbs the laser beam, and their contact surfaces are melted with the laser beam for joining the members, the apparatus comprising: a laser beam generating means for irradiating the contact surfaces with a laser beam shone from the side of the first member so as to melt at least one of the contact surfaces of the first member and the second member; a pressing means for pressing the first member and the second member together by a pressing force; an adjusting means for adjusting the pressing force applied to the first member and the second member; a detecting means for detecting a temperature or a pressure at a melted portion melted by laser beam irradiation of the first member and the second member, and a controller configured to directly control the adjustment means based on the detected temperature or pressure; wherein the controller controls the pressing force by increasing the pressing force to a first pressing force when a detected temperature or pressure is greater than a predetermined value, and further increasing the pressing force to a second pressing force when another detected temperature or pressure indicates cooling at the melted portion.