| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent the occurrence of insufficient strength owing to a shortage of a welding amount caused by uneven welding, to prevent air-tightness from being impaired owing to the occurrence of air leak, and to prevent the occurrence of poor appearance due to leakage of a surplus resin caused by an excessive molten resin when manufacturing a resin-made case having a two-divided structure by joining two respective case-pieces of the resin-made case with ultrasonic welding. <P>SOLUTION: A level difference is formed on each outer peripheral wall of a pair of speaker cabinet pieces 1, 2 made of the same thermoplastic resin and having a divided structure so as to form each joint that is fitted to each other while being engaged with each other. A protruding rib with a nearly right-triangular cross-section, which is protruded from the joint end face of at least one of the cabinet pieces so as to function as a so-called energy director, is formed. The protruding rib is melted by applying ultrasonic vibration energy and a pressing force so as to integrally join each cabinet piece with each other while welding the joints. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
