| 摘要 |
PURPOSE:To stitch-bond a metallic wire to an inner lead, which has a surface material easy to oxidize, at fine pitches and stably with enough junction strength. CONSTITUTION:An inner lead 2, where an Ag layer is applied, and an Au metallic wire 1 are stitch-bonded by applying vibration energy and load through a capillary. For the junction part of the metallic wire 1, a plastic deformation part 11 consisting of the flat part and the concave on a intermetallic compound 4 of Au-Ag is made. The width F1 of this flat part is half or less than the diameter of the metallic wire 1 and nor less than 5mum, and the radius OR1 of curvature of the concave is twice or more than the metallic wire 1. |
