| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bonding wire manufacturing method which allows the improvement of the yield and workability of wire bonding by suppressing the falling of a coating layer off a core in a step of drawing a multilayer bonding wire. <P>SOLUTION: The method comprises a wire-drawing step where a coated wire 30 having a core 10 containing copper as a primary component and a coating layer 20 formed on the core to surround it is passed through a plurality of dies 60-67, and stepwise drawn and extended. If the reduction rate of the dies in the wire-drawing step is defined by the formula (1), the first die has a reduction rate between 5% and 10% inclusive, and the second and subsequent dies have a reduction rate between 5% and 15% inclusive. The reduction rate of the first die is set to be smaller than that of the second die. <P>COPYRIGHT: (C)2013,JPO&INPIT |
