Patent ID: 8017876
Filing Date: 2011-09-13
Classification: C25D,H01L,H05K,Y10T

Abstract:
1. A terminal portion having a copper or a copper alloy wiring, to be connect-fitted to a connector by being pressed by a connector pin, of a flexible print circuit board or a flexible flat cable, wherein the copper or the copper alloy wiring having a pure tin or a lead-free tin alloy plating layer formed thereon is thermally treated so as to form an inter-metal compound including copper and tin on the copper or the copper alloy wiring, and a remaining thickness of the pure tin or the lead-free tin alloy plating layer is from 0.2 μm to 1.6 μm, wherein as an initial plating layer, a thickness of the pure tin or the lead-free tin alloy plating layer formed on the copper or the copper alloy wiring is from 1.5 μm to 5.0 μm, and a thickness of the inter-metal compound including copper and tin is from 0.1 μm to 3.5 μm.