Patent ID: 8940405
Filing Date: 2015-01-27
Classification: B32B,C23C,C25D,H01R,Y10T

Abstract:
1. A copper sheet, comprising: a Cu—Sn alloy coating layer and a Sn or Sn alloy coating layer on an outermost surface thereof, wherein the copper sheet has a surface roughness defined by: an arithmetic mean roughness Ra of 0.5 μm or more and 4.0 μm or less in a direction parallel to a sliding direction upon connection, a mean projection-depression interval RSm of 0.01 mm or more and 0.3 mm or less in the direction parallel to the sliding direction, a skewness Rsk of less than 0, and a protrusion peak portion height Rpk of 1 μm or less in the direction parallel to the sliding direction, and wherein the copper sheet is suitable for a connecting part having the Sn coating layer present as a plurality of parallel lines satisfying either or both of conditions (A)-(B): (A) the lines have substantially constant width and are spaced at substantially regular intervals, and/or (B) the lines have substantially constant width over a continuous length thereof.