| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a lead frame which suppresses occurrence of cracks when being bent and exhibits superior adhesion to a mold resin. <P>SOLUTION: In a lead frame in which a noble metal-plated layer 13 is formed on the surface of a raw material metal 10 via an Ni-plated substrate layer, the surface roughness Ra of the Ni-plated substrate layer is within the range of 0.1 to 0.8μm. The noble metal-plated layer 13 is formed on the surface of the Ni-plated substrate layer by a flash plating in conformity to the angular or aciculate rough profile of the surface of the Ni-plated substrate layer. In that regard, the noble metal of the plated layer 13 is at least one of Pd, Au and Ag. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
