Copper alloy strip for lead frame of LED

摘要

Provided is a lead frame made of a Cu—Fe-based copper alloy strip to improve the heat dissipation in an LED package. An Ag plating reflective film formed on the lead frame enhances the brightness of the LED package. In the Cu—Fe-based copper alloy strip, arithmetic mean roughness Ra is 0.2 μm or less, ten-point mean roughness RzJIS is 1.2 μm or less, and maximum height roughness Rz is 1.5 μm or less and depressions having an average length in a rolling parallel direction of 2 to 100 μm, an average length in the rolling vertical direction of 1-30 μm, and a maximum depth along the rolling parallel direction of 400 nm or less. The Cu—Fe-based copper alloy strip contains 1.8-2.6 mass % of Fe, 0.005-0.20 mass % of P, and 0.01-0.50 mass % of Zn or contains 0.01-0.5 mass % of Fe, 0.01-0.20 mass % of P, 0.01-1.0 mass % of Zn, and 0.01-0.15 mass % of Sn.

主权项

1. A copper alloy strip,
having a surface with depressions; wherein: the surface has a surface roughness in a rolling vertical direction such that Ra is 0.2 μm or less, RzJIS is 1.2 μm or less, and Rz is 1.5 μm or less; and the depressions have an average length in a rolling parallel direction of 2 to 100 μm, an average length in the rolling vertical direction of 1 to 30 μm, and a maximum depth along the rolling parallel direction of 400 nm or less.