Copper alloy strip for a lead frame of an led

摘要

It is a lead frame, which consists of a copper alloy strip is produced on cu-fe-base, in order to improve the heat dissipation is provided in a led module. A reflecting ag-plating, which is formed on said lead frame, increases the brightness of the led module. In the copper alloy strip on cu-fe-base, the arithmetic mean roughness value ra 0.2 μm or less, the average ten-point roughness rz_{With jis} is 1.2 μm or less and the maximum height of the surface roughness rz is 1.5 μm or less and recesses have an average length parallel to the rolling direction of from 2 to 100 μm, an average length perpendicular to the direction of rolling of from 1 to 30 μm and a maximum depth is parallel to the rolling direction of 400 nm or less. The copper alloy strip contains on cu-fe-base 1.8 to 2.6% by weight of fe, 0.005 to 0.20% by weight of p and 0.01 to 0.50% by weight of zn or contains 0.01 to 0.5% by weight of fe, 0.01 to 0.20% by weight of p, 0.01 to 1.0% by weight of zn and from 0.01 to 0.15% by weight sn.