| 摘要 |
A method for manufacturing a resin molding that uses a laser beam can provide a high level of adhesion, an excellent appearance, and can include very strong welded portions. The method can include preparing a light-transmitting resin member having a protruding portion formed on a rear surface of the light-transmitting resin member and having an end surface, the protruding portion having both side surfaces having asymmetric inclination angles with respect to the normal of the end surface of the protruding portion. The method can also include arranging and pressing together the end surface of the protruding portion that is a welded region of the light-transmitting resin member, and a welded region of a corresponding light-absorbing resin member so that they are opposed to each other. A laser beam can be emitted from a laser light source to be incident on a surface of the light-transmitting resin member while the laser beam is refracted. The method can also include repeatedly irradiating the laser beam onto the welded regions to heat and fuse the entire welded regions to weld the light-transmitting resin member and the light-absorbing resin member while opposed to each other and pressed together, wherein the inclination angle of the side surface of the protruding member near the laser light source is equal to or more than a travel angle of the refracted laser beam. |
