Kobe Steel, Ltd.

Masayasu Nishimura

Ryoichi Ozaki

Yasushi Masago

Masahiro Kawaguchi

Yosuke Miwa

Yasuhiro Shintani

Toshihisa Hara

Shinya Katsura

Junichi Kakumoto

Koichi Taira

Toshiyuki Mitsui

Hideki Matsushita

Provided is a lead frame made of a Cu&#x2014;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&#x2014;Fe-based copper alloy strip, arithmetic mean roughness Ra is 0.2 &#x3bc;m or less, ten-point mean roughness Rzis 1.2 &#x3bc;m or less, and maximum height roughness Rz is 1.5 &#x3bc;m or less and depressions having an average length in a rolling parallel direction of 2 to 100 &#x3bc;m, an average length in the rolling vertical direction of 1-30 &#x3bc;m, and a maximum depth along the rolling parallel direction of 400 nm or less. The Cu&#x2014;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.

Copper alloy strip for lead frame of LED

The invention forms a Sn coating layer and a Cu&#x2014;Sn alloy coating layer having a suitably controllable planar shape in a PCB terminal. A group of Sn coating layers being as a plurality of essentially parallel lines is formed as the surface coating layer, and a Cu&#x2014;Sn alloy coating layeris exposed on the outermost surface on both sides of Sn coating layers each constituting the group of Sn coating layers. The Sn coating layers have a width of 1 to 500 &#x3bc;m, an interval between adjacent Sn coating layers is 1 to 20000 &#x3bc;m, and an outermost maximum height roughness in a terminal insertion direction is at most 10 &#x3bc;m.

PCB terminal and method for manufacturing the same

A QFN package is provided with a lead frame formed by processing a copper alloy sheet containing 0.01 to 0.50% by mass Fe, 0.01 to 0.20% by mass P, and Cu and inevitable impurities as other components, having a micro Vickers hardness of 150 or above, a uniform elongation of 5% or below and a local elongation of 10% or below, or a copper alloy sheet containing 0.05 to 2% by mass Ni, 0.001 to 0.3% by mass P, 0.005 to 5% by mass Zn, and Cu and inevitable impurities as other components, having a micro Vickers hardness of 150 or above, a uniform elongation of 5% or below and a local elongation of 10% or below. Lead burrs formed during the dicing of the QFN package are short, and a dicing blade used for dicing the QFN package is abraded at a low wear-out rate.

Copper alloy sheet and QFN package

A plated copper alloy material for connecting terminals is provided which comprises a parent material of copper or copper alloy, a nickel layer and a copper-tin alloy layer. The nickel layer has a thickness of 0.1-1.0 &#x3bc;m. The copper-tin alloy layer has a thickness of 0.1-1.0 &#x3bc;m and contains 35-75 at % of copper. The material may additionally have a tin layer no thicker than 0.5 &#x3bc;m for an engaging type terminal containing 0.001-0.1 mass % of carbon, or thicker than 0.5 &#x3bc;m for a non-engaging type connector. The material meets requirements for capability of insertion with a small force, good electric reliability (due to low contact resistance) in a high-temperature atmosphere, workability for sharp bending without cracking, good solder wettability and good corrosion resistance to sulfur dioxide gas.

Plated copper alloy material and process for production thereof

A plated copper alloy material for connecting terminals is provided which comprises a parent material of copper or copper alloy, a nickel layer and a copper-tin alloy layer. The nickel layer has a thickness of 0.1-1.0 &mgr;m. The copper-tin alloy layer has a thickness of 0.1-1.0 &mgr;m and contains 35-75 at % of copper. The material may additionally have a tin layer no thicker than 0.5 &mgr;m for an engaging type terminal containing 0.001-0.1 mass % of carbon, or thicker than 0.5 &mgr;m for a non-engaging type connector. The material meets requirements for capability of insertion with a small force, good electric reliability (due to low contact resistance) in a high-temperature atmosphere, workability for sharp bending without cracking, good solder wettability and good corrosion resistance to sulfur dioxide gas.

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Shimonoseki, Japan

Masayasu Nishimura