| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a roughening method for performing a stable processing in thin foil of not larger than 10μm, copper foil and copper alloy foil of not smaller than 100μm and 42 alloy used for a lead frame. <P>SOLUTION: In the roughening method of metal foil, metal foil is irradiated with a laser beam to unevenness of 0.5 to 10μm, whose surface roughness is 10 point average roughness, is formed. The roughened metal foil is obtained by the roughening method mentioned. A rust prevention layer is disposed on the surface of metal foil and has a coupling agent processing layer on the surface. <P>COPYRIGHT: (C)2003,JPO</p> |
