Patent ID: 6602362
Filing Date: 2003-08-05
Classification: G11B,H05K

Abstract:
A copper-alloy foil to be used for a suspension member of a hard-disc drive, consisting, by mass percentage, of from 1 to 4.8% of Ni, from 0.2 to 1.4% of Si, a ratio of Ni content relative to Si content being adjusted to 2 to 8, a balance being essentially copper and unavoidable impurities, having 650 MPa or more of tensile strength, and including inclusions not exceeding 10 &mgr;m in size and fifty or less inclusions from 5 to 10 &mgr;m in size per mm2 of a cross section of the foil in a direction parallel to a rolling direction, and exhibiting from âˆ’0.1 to +0.1% of a following ratio of thermal expansion and shrinkage measured in the direction parallel to the rolling direction and occurring prior and subsequent to heating at 330Â° C. for 2 hours, corresponding to a heating condition to which the foil is subjected to thermal pressure bonding with polyimide,&Dgr;(%)=(lâˆ’l0)/l0Ã—100 whereinl0 is the length of a specimen before heating, and l is the length of a specimen after heating.