| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a joint method for laser-welding a heat spreader and a metal plate serving as an external lead-out conductor to assure a rigid, reliable joint without damaging a solder beneath the metal plate. <P>SOLUTION: A copper plate 5, which serves as an external lead-out conductor, is placed on a copper side in a heat spreader 1 of clad material using a laminate of copper and copper-molybdenum sintered body. A laser output unit 18 is positioned at a target melt position 21, a YAG laser beam 19 is irradiated from the laser output unit 18, and then the copper plate 5 and the copper of the clad material heat spreader 1 are melted and adhered at the melting section 20. In this heat spreader 1, the melting section 20 which reaches the copper-molybdenum sintered body can be produced, so that a welding structure is attained with a high joint strength and a good characteristic in both electric resistance and thermal resistance. <P>COPYRIGHT: (C)2007,JPO&INPIT |
